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<?xml version="1.0" standalone="yes" encoding="windows-1252"?> |
<!-- XBRL Document Created with XBRLMaster --> |
<!-- Version: 2.3.08 --> |
<!-- Based on XBRL 2.1 --> |
<!-- Date of creation: 11/14/2022 --> |
<!-- Software architectural design and coding: A'c Dharmapremananda Avt. --> |
<!-- Copyright (c) 2022 I-NET Business Solutions, Inc. All Rights Reserved. --> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_StockIssuedForCashlessExerciseOfStockOptionsShares" xlink:label="loc_meecStockIssuedForCashlessExerciseOfStockOptionsShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockIssuedForCashlessExerciseOfStockOptionsShares" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForConversionOfConvertibleNotesShares" xlink:label="loc_meecIssuanceOfStockForConversionOfConvertibleNotesShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForConversionOfConvertibleNotesShares" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForConversionOfConvertibleNotesAmount" xlink:label="loc_meecIssuanceOfStockForConversionOfConvertibleNotesAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForConversionOfConvertibleNotesAmount" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_StockIssuedForCashlessExerciseOfOptionsShares" xlink:label="loc_meecStockIssuedForCashlessExerciseOfOptionsShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockIssuedForCashlessExerciseOfOptionsShares" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_StockIssuedForCashlessExerciseOfStockOptionsValue" xlink:label="loc_meecStockIssuedForCashlessExerciseOfStockOptionsValue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockIssuedForCashlessExerciseOfStockOptionsValue" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForCompensationShares" xlink:label="loc_meecIssuanceOfStockForCompensationShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForCompensationShares" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForCompensationValue" xlink:label="loc_meecIssuanceOfStockForCompensationValue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForCompensationValue" order="23"/> |
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| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:title="000006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/Organization" xlink:title="000007 - Disclosure - Organization"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="000008 - Disclosure - Summary of Significant Accounting Policies"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/LiquidityAndFinancialCondition" xlink:title="000009 - Disclosure - Liquidity and Financial Condition"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/Inventory" xlink:title="000010 - Disclosure - Inventory"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/PropertyAndEquipmentNet" xlink:title="000011 - Disclosure - Property and Equipment, Net"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/IntellectualProperty" xlink:title="000012 - Disclosure - Intellectual Property"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/NotesPayable" xlink:title="000013 - Disclosure - Notes Payable"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/ConvertibleNotesPayable" xlink:title="000014 - Disclosure - Convertible Notes Payable"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/RelatedParty" xlink:title="000015 - Disclosure - Related Party"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/OperatingLeases" xlink:title="000016 - Disclosure - Operating Leases"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/CommitmentsAndContingencies" xlink:title="000017 - Disclosure - Commitments and Contingencies"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/StockBasedCompensation" xlink:title="000018 - Disclosure - Stock Based Compensation"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/Warrants" xlink:title="000019 - Disclosure - Warrants"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SubsequentEvents" xlink:title="000020 - Disclosure - Subsequent Events"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:title="000021 - Disclosure - Summary Of Significant Accounting Policies (Policies)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:title="000022 - Disclosure - Summary of Significant Accounting Policies (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/InventoryTables" xlink:title="000023 - Disclosure - Inventory (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/PropertyAndEquipmentNetTables" xlink:title="000024 - Disclosure - Property And Equipment Net (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/IntellectualPropertyTables" xlink:title="000025 - Disclosure - Intellectual Property (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/RelatedPartyTables" xlink:title="000026 - Disclosure - Related Party (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/OperatingLeasesTables" xlink:title="000027 - Disclosure - Operating Leases (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/StockBasedCompensationTables" xlink:title="000028 - Disclosure - Stock Based Compensation (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/WarrantsTables" xlink:title="000029 - Disclosure - Warrants (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="000030 - Disclosure - Summary of Significant Accounting Policies (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaapFairValueInputsLevel1Member"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel1Member" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaapFairValueInputsLevel2Member"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel2Member" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TotalMember" xlink:label="loc_meecTotalMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_meecTotalMember" order="43"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member" order="44"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ProfitShareLiabilityRelatedParty" xlink:label="loc_meecProfitShareLiabilityRelatedParty"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecProfitShareLiabilityRelatedParty" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLiabilities" order="2"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesDetails1" xlink:title="000031 - Disclosure - Summary of Significant Accounting Policies (Details 1)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srtProductOrServiceAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtProductOrServiceAxis" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain_10" order="50" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TotalMember" xlink:label="loc_meecTotalMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_meecTotalMember" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_UnitedStateMember" xlink:label="loc_meecUnitedStateMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_meecUnitedStateMember" order="32"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NewPlaceHolderElement" xlink:label="loc_meecNewPlaceHolderElement"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNewPlaceHolderElement" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_LicenseRevenue" xlink:label="loc_meecLicenseRevenue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecLicenseRevenue" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaapBusinessCombinationAcquisitionRelatedCosts"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationAcquisitionRelatedCosts" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_EquipmentRevenue" xlink:label="loc_meecEquipmentRevenue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecEquipmentRevenue" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaapCostOfRevenue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCostOfRevenue" order="5"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesDetails2" xlink:title="000032 - Disclosure - Summary of Significant Accounting Policies (Details 2)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaapShortTermDebtTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapShortTermDebtTypeAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis"/> |
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| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:title="000034 - Disclosure - Summary of Significant Accounting Policies (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis" order="60"/> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_SecondCustomerMember" xlink:label="loc_meecSecondCustomerMember"/> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FirstCustomerMember" xlink:label="loc_meecFirstCustomerMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecFirstCustomerMember" order="83"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ThirdCustomerMember" xlink:label="loc_meecThirdCustomerMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecThirdCustomerMember" order="84"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FourthCustomerMember" xlink:label="loc_meecFourthCustomerMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecFourthCustomerMember" order="85"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaapAccountsReceivableMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapAccountsReceivableMember" order="86"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_PurchaseMember" xlink:label="loc_meecPurchaseMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_meecPurchaseMember" order="87"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TwoSuppliersMember" xlink:label="loc_meecTwoSuppliersMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecTwoSuppliersMember" order="88"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAcceleratedShareRepurchasesDateDomain" xlink:to="loc_meecTwoVendorsMember" order="89"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_meecAccountsPayableAndAccruedExpensesMember" order="90"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ThreeSuppliersMember" xlink:label="loc_meecThreeSuppliersMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecThreeSuppliersMember" order="91"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharePrice" order="1"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecConcentrationRiskPercentage" order="3"/> |
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| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/LiquidityAndFinancialConditionDetailsNarrative" xlink:title="000035 - Disclosure - Liquidity and Financial Condition (Details Narrative)"> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_GoingConcernMember" xlink:label="loc_meecGoingConcernMember"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProfitLoss" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WorkingCapital" xlink:label="loc_meecWorkingCapital"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWorkingCapital" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaapDebtInstrumentFaceAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentFaceAmount" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivities"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivities" order="8"/> |
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| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/InventoryDetails" xlink:title="000036 - Disclosure - Inventory (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/PropertyAndEquipmentNetDetails" xlink:title="000037 - Disclosure - Property And Equipment Net (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralAxis" xlink:label="loc_us-gaapCollateralAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapCollateralAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralDomain" xlink:label="loc_us-gaapCollateralDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapCollateralAxis" xlink:to="loc_us-gaapCollateralDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralDomain" xlink:label="loc_us-gaapCollateralDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapCollateralAxis" xlink:to="loc_us-gaapCollateralDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" order="40"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" order="50"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaapEquipmentMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollateralDomain" xlink:to="loc_us-gaapEquipmentMember" order="41"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_meecTruckingEquipmentMember" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OfficeEquipmentComputerEquipmentAndSoftwaretMember" xlink:label="loc_meecOfficeEquipmentComputerEquipmentAndSoftwaretMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_meecOfficeEquipmentComputerEquipmentAndSoftwaretMember" order="43"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentGross" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_LessAccumulatedDepreciation" xlink:label="loc_meecLessAccumulatedDepreciation"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecLessAccumulatedDepreciation" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryRealEstateConstructionInProcess" xlink:label="loc_us-gaapInventoryRealEstateConstructionInProcess"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapInventoryRealEstateConstructionInProcess" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet" order="4"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/PropertyAndEquipmentNetDetailsNarrative" xlink:title="000038 - Disclosure - Property And Equipment Net (Details Narrative)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/IntellectualPropertyDetails" xlink:title="000039 - Disclosure - Intellectual Property (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/IntellectualPropertyDetailsNarrative" xlink:title="000040 - Disclosure - Intellectual Property (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAwardDateAxis" order="20"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain" order="30"/> |
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| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis" xlink:label="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis" order="40"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis" xlink:to="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis" xlink:label="loc_srtStatementScenarioAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtStatementScenarioAxis" order="60"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srtScenarioUnspecifiedDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementScenarioAxis" xlink:to="loc_srtScenarioUnspecifiedDomain" order="70"/> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OnAprilTwentyFourTwoThousandsSixteenMember" xlink:label="loc_meecOnAprilTwentyFourTwoThousandsSixteenMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecOnAprilTwentyFourTwoThousandsSixteenMember" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LicenseAgreementTermsMember" xlink:label="loc_us-gaapLicenseAgreementTermsMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersTypeDomain" xlink:to="loc_us-gaapLicenseAgreementTermsMember" order="62"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_InventorsDesignatedByEercfMember" xlink:label="loc_meecInventorsDesignatedByEercfMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtScenarioUnspecifiedDomain" xlink:to="loc_meecInventorsDesignatedByEercfMember" order="63"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAdjustmentForAmortization" order="1"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" order="2"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" order="3"/> |
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| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/NotesPayableDetailsNarrative" xlink:title="000041 - Disclosure - Notes Payable (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionAxis" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaapShortTermDebtTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapShortTermDebtTypeAxis" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain" order="60"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain_10" order="70" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_BusinessLoanAgreementMember" xlink:label="loc_meecBusinessLoanAgreementMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecBusinessLoanAgreementMember" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MESIncMember" xlink:label="loc_meecMESIncMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecMESIncMember" order="52"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_PaycheckProtectionProgramMember" xlink:label="loc_meecPaycheckProtectionProgramMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShortTermDebtTypeDomain" xlink:to="loc_meecPaycheckProtectionProgramMember" order="53"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FirstInternationalBankTrustMember" xlink:label="loc_meecFirstInternationalBankTrustMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecFirstInternationalBankTrustMember" order="54"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaapDebtInstrumentMaturityDate"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentMaturityDate" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayable" xlink:label="loc_us-gaapLoansPayable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLoansPayable" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaapDebtInstrumentInterestRateDuringPeriod"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentInterestRateDuringPeriod" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ExtinguishmentOfDebtAmount" xlink:label="loc_us-gaapExtinguishmentOfDebtAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapExtinguishmentOfDebtAmount" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromLoanOriginations1" xlink:label="loc_us-gaapProceedsFromLoanOriginations1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProceedsFromLoanOriginations1" order="5"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/ConvertibleNotesPayableDetailsNarrative" xlink:title="000042 - Disclosure - Convertible Notes Payable (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaapDebtInstrumentAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapDebtInstrumentAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAwardDateAxis" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain_10" order="50" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NotesIssuedTwoThousandThirteenMember" xlink:label="loc_meecNotesIssuedTwoThousandThirteenMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecNotesIssuedTwoThousandThirteenMember" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_Notes2013Member" xlink:label="loc_meecNotes2013Member"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecNotes2013Member" order="32"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JulyThirtyTwoThousandsThirteenToDecemberTwentyFourTwoThousandsThirteenMember" xlink:label="loc_meecJulyThirtyTwoThousandsThirteenToDecemberTwentyFourTwoThousandsThirteenMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecJulyThirtyTwoThousandsThirteenToDecemberTwentyFourTwoThousandsThirteenMember" order="33"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FebruaryTwentySixTwoThousandTwentyOneMember" xlink:label="loc_meecFebruaryTwentySixTwoThousandTwentyOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecFebruaryTwentySixTwoThousandTwentyOneMember" order="34"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FebruaryTwentySixAndMarchEightTwoThousandTwentyOneMember" xlink:label="loc_meecFebruaryTwentySixAndMarchEightTwoThousandTwentyOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecFebruaryTwentySixAndMarchEightTwoThousandTwentyOneMember" order="35"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JuneEighteenTwentyNineteenThroughOctoberTwentyThreeTwentyNineteenMember" xlink:label="loc_meecJuneEighteenTwentyNineteenThroughOctoberTwentyThreeTwentyNineteenMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecJuneEighteenTwentyNineteenThroughOctoberTwentyThreeTwentyNineteenMember" order="36"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FebruaryEightToFebruaryFifteenMember" xlink:label="loc_meecFebruaryEightToFebruaryFifteenMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecFebruaryEightToFebruaryFifteenMember" order="37"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JuneSeventeenAndJuneTwentyThreeMember" xlink:label="loc_meecJuneSeventeenAndJuneTwentyThreeMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecJuneSeventeenAndJuneTwentyThreeMember" order="38"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_August312018ThroughOctober302018Member" xlink:label="loc_meecAugust312018ThroughOctober302018Member"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecAugust312018ThroughOctober302018Member" order="39"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_CommonStockPriceExceed" xlink:label="loc_meecCommonStockPriceExceed"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecCommonStockPriceExceed" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="loc_us-gaapDebtConversionConvertedInstrumentAmount1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtConversionConvertedInstrumentAmount1" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForConversionOfConvertibleNotesShares" xlink:label="loc_meecIssuanceOfStockForConversionOfConvertibleNotesShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForConversionOfConvertibleNotesShares" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaapCommonStockParOrStatedValuePerShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockParOrStatedValuePerShare" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IssuanceOfStockForConversionOfConvertibleNotesAmount" xlink:label="loc_meecIssuanceOfStockForConversionOfConvertibleNotesAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIssuanceOfStockForConversionOfConvertibleNotesAmount" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebt" xlink:label="loc_us-gaapUnsecuredDebt"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapUnsecuredDebt" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAnnualPrincipalPayment" xlink:label="loc_us-gaapDebtInstrumentAnnualPrincipalPayment"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentAnnualPrincipalPayment" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleTermsOfConversionFeature" xlink:label="loc_us-gaapDebtInstrumentConvertibleTermsOfConversionFeature"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentConvertibleTermsOfConversionFeature" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ConvertibleNotesSold" xlink:label="loc_meecConvertibleNotesSold"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecConvertibleNotesSold" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockAmountIssued1" xlink:label="loc_us-gaapConversionOfStockAmountIssued1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapConversionOfStockAmountIssued1" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockAmountConverted1" xlink:label="loc_us-gaapConversionOfStockAmountConverted1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapConversionOfStockAmountConverted1" order="13"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/RelatedPartyDetails" xlink:title="000043 - Disclosure - Related party (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NotePayableRelatedPartyMember" xlink:label="loc_meecNotePayableRelatedPartyMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecNotePayableRelatedPartyMember" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_UnsecuredNotePayable" xlink:label="loc_meecUnsecuredNotePayable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecUnsecuredNotePayable" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FairValueAdjustmentOnExtinguishment" xlink:label="loc_meecFairValueAdjustmentOnExtinguishment"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecFairValueAdjustmentOnExtinguishment" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaapUnamortizedDebtIssuanceExpense"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapUnamortizedDebtIssuanceExpense" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleNotesPayable" xlink:label="loc_us-gaapConvertibleNotesPayable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapConvertibleNotesPayable" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebtCurrent" xlink:label="loc_us-gaapUnsecuredDebtCurrent"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapUnsecuredDebtCurrent" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_UnsecuredNotePayableNetOfCurrentPortion" xlink:label="loc_meecUnsecuredNotePayableNetOfCurrentPortion"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecUnsecuredNotePayableNetOfCurrentPortion" order="6"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/RelatedPartyDetails1" xlink:title="000044 - Disclosure - Related party (Details 1)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/RelatedPartyDetailsNarrative" xlink:title="000045 - Disclosure - Related party (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaapShortTermDebtTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapShortTermDebtTypeAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaapShortTermDebtTypeDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapShortTermDebtTypeAxis" xlink:to="loc_us-gaapShortTermDebtTypeDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaapDebtInstrumentAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapDebtInstrumentAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain_10" order="50" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionAxis" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPlanNameAxis" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" order="60"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" order="70" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ACMidwestSubordinatedNoteMember" xlink:label="loc_meecACMidwestSubordinatedNoteMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShortTermDebtTypeDomain" xlink:to="loc_meecACMidwestSubordinatedNoteMember" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_SeniorNoteMember" xlink:label="loc_meecSeniorNoteMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_meecSeniorNoteMember" order="52"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_BoardOfDirectorsChairmanMember" xlink:label="loc_srtBoardOfDirectorsChairmanMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_srtBoardOfDirectorsChairmanMember" order="53"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MEECMember" xlink:label="loc_meecMEECMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecMEECMember" order="54"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_KayeCooperKayRosenbergLLPMember" xlink:label="loc_meecKayeCooperKayRosenbergLLPMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecKayeCooperKayRosenbergLLPMember" order="55"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ACMidwestUnsecuredNoteMember" xlink:label="loc_meecACMidwestUnsecuredNoteMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShortTermDebtTypeDomain" xlink:to="loc_meecACMidwestUnsecuredNoteMember" order="56"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ACMidwestMember" xlink:label="loc_meecACMidwestMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecACMidwestMember" order="57"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DebtRepaymentAgreementMember" xlink:label="loc_meecDebtRepaymentAgreementMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecDebtRepaymentAgreementMember" order="58"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_PurchaseOfPickUpTruckFromCfo" xlink:label="loc_meecPurchaseOfPickUpTruckFromCfo"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecPurchaseOfPickUpTruckFromCfo" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_InterestExpenses" xlink:label="loc_meecInterestExpenses"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecInterestExpenses" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_UnamortizedBalanceOfDiscount" xlink:label="loc_meecUnamortizedBalanceOfDiscount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecUnamortizedBalanceOfDiscount" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtIssuanceCostsLineOfCreditArrangementsGross" xlink:label="loc_us-gaapDebtIssuanceCostsLineOfCreditArrangementsGross"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtIssuanceCostsLineOfCreditArrangementsGross" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaapProceedsFromIssuanceInitialPublicOffering"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProceedsFromIssuanceInitialPublicOffering" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaapDebtInstrumentMaturityDate"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentMaturityDate" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ExtensionOfMaturityDate" xlink:label="loc_meecExtensionOfMaturityDate"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecExtensionOfMaturityDate" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaapAmortizationOfDebtDiscountPremium"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAmortizationOfDebtDiscountPremium" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaapDebtInstrumentCarryingAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentCarryingAmount" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_RelatedPartyDebtRestructuringResultingInCapitalContribution" xlink:label="loc_meecRelatedPartyDebtRestructuringResultingInCapitalContribution"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecRelatedPartyDebtRestructuringResultingInCapitalContribution" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FairValueInputDiscountForLackOfMarketability" xlink:label="loc_meecFairValueInputDiscountForLackOfMarketability"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecFairValueInputDiscountForLackOfMarketability" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaapDebtInstrumentInterestRateDuringPeriod"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentInterestRateDuringPeriod" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAnnualPrincipalPayment" xlink:label="loc_us-gaapDebtInstrumentAnnualPrincipalPayment"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentAnnualPrincipalPayment" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFeeAmount" xlink:label="loc_us-gaapDebtInstrumentFeeAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDebtInstrumentFeeAmount" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash" xlink:label="loc_us-gaapCash"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCash" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DebtOutstandingAmount" xlink:label="loc_meecDebtOutstandingAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecDebtOutstandingAmount" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FairValueOfSharingProfit" xlink:label="loc_meecFairValueOfSharingProfit"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecFairValueOfSharingProfit" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_YearlyPaymentDescription" xlink:label="loc_meecYearlyPaymentDescription"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecYearlyPaymentDescription" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaapDueToRelatedPartiesCurrent"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDueToRelatedPartiesCurrent" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LegalFees" xlink:label="loc_us-gaapLegalFees"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLegalFees" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IncreaseinDebtInstrumentAnnualPrincipalPayment" xlink:label="loc_meecIncreaseinDebtInstrumentAnnualPrincipalPayment"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecIncreaseinDebtInstrumentAnnualPrincipalPayment" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NetLicensingRevenue" xlink:label="loc_meecNetLicensingRevenue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNetLicensingRevenue" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_RepaymentOfDebtDescription" xlink:label="loc_meecRepaymentOfDebtDescription"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecRepaymentOfDebtDescription" order="23"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_PercentagesOfRemainingOutstandingPrincipalBalance" xlink:label="loc_meecPercentagesOfRemainingOutstandingPrincipalBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecPercentagesOfRemainingOutstandingPrincipalBalance" order="24"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_PercentagesOfAggregateOutstandingPrincipalBalance" xlink:label="loc_meecPercentagesOfAggregateOutstandingPrincipalBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecPercentagesOfAggregateOutstandingPrincipalBalance" order="25"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ProfitShareValuation" xlink:label="loc_meecProfitShareValuation"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecProfitShareValuation" order="26"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ProfitShareValuationAdjusted" xlink:label="loc_meecProfitShareValuationAdjusted"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecProfitShareValuationAdjusted" order="27"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/OperatingLeasesDetails" xlink:title="000046 - Disclosure - Operating Leases (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/OperatingLeasesDetails1" xlink:title="000047 - Disclosure - Operating Leases (Details 1)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/OperatingLeasesDetailsNarrative" xlink:title="000048 - Disclosure - Operating Leases (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srtStatementGeographicalAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtStatementGeographicalAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAwardDateAxis" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain_10" order="50" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPlanNameAxis" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_CorsicanaWarehouseMember" xlink:label="loc_meecCorsicanaWarehouseMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_meecCorsicanaWarehouseMember" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JulyOneTwoZeroOneFiveMember" xlink:label="loc_meecJulyOneTwoZeroOneFiveMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecJulyOneTwoZeroOneFiveMember" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TwoZeroOneSixMember" xlink:label="loc_meecTwoZeroOneSixMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecTwoZeroOneSixMember" order="43"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TrailersMember" xlink:label="loc_meecTrailersMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecTrailersMember" order="44"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageDiscountRate" xlink:label="loc_meecWeightedAverageDiscountRate"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageDiscountRate" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationTerm" xlink:label="loc_us-gaapUnrecordedUnconditionalPurchaseObligationTerm"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapUnrecordedUnconditionalPurchaseObligationTerm" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_RightOfUseAssetAmortization" xlink:label="loc_meecRightOfUseAssetAmortization"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecRightOfUseAssetAmortization" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OperatingLeaseLiabilityCurrentAndNonCurrent" xlink:label="loc_meecOperatingLeaseLiabilityCurrentAndNonCurrent"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOperatingLeaseLiabilityCurrentAndNonCurrent" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaapOperatingLeaseLiability"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOperatingLeaseLiability" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_LesseeOperatingLeaseTermOfContract1" xlink:label="loc_meecLesseeOperatingLeaseTermOfContract1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecLesseeOperatingLeaseTermOfContract1" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MonthlyRentExpenses" xlink:label="loc_meecMonthlyRentExpenses"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecMonthlyRentExpenses" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MonthlyExpensesProDataBasis" xlink:label="loc_meecMonthlyExpensesProDataBasis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecMonthlyExpensesProDataBasis" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MonthlyPayments" xlink:label="loc_meecMonthlyPayments"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecMonthlyPayments" order="9"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:title="000049 - Disclosure - Commitments and Contingencies (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis" xlink:label="loc_srtMajorCustomersAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtMajorCustomersAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srtNameOfMajorCustomerDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtMajorCustomersAxis" xlink:to="loc_srtNameOfMajorCustomerDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srtNameOfMajorCustomerDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srtMajorCustomersAxis" xlink:to="loc_srtNameOfMajorCustomerDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_CommercialCustomersMember" xlink:label="loc_meecCommercialCustomersMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtNameOfMajorCustomerDomain" xlink:to="loc_meecCommercialCustomersMember" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ContractsExpiryDateDescription" xlink:label="loc_meecContractsExpiryDateDescription"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecContractsExpiryDateDescription" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/StockBasedCompensationDetails" xlink:title="000050 - Disclosure - Stock Based Compensation (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/StockBasedCompensationDetailsNarrative" xlink:title="000051 - Disclosure - Stock Based Compensation (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapPlanNameAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaapAwardDateAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapAwardDateAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaapAwardDateDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapAwardDateAxis" xlink:to="loc_us-gaapAwardDateDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaapRelatedPartyDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionsByRelatedPartyAxis" xlink:to="loc_us-gaapRelatedPartyDomain_10" order="50" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaapRelatedPartyTransactionAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapRelatedPartyTransactionAxis" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain" order="50"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaapRelatedPartyTransactionDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapRelatedPartyTransactionAxis" xlink:to="loc_us-gaapRelatedPartyTransactionDomain_10" order="60" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaapIncomeStatementLocationAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapIncomeStatementLocationAxis" order="60"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain" order="70"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain_10" order="80" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtRangeAxis" order="80"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" order="90"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" order="100" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" order="90"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" order="100"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" order="110" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ConsultingAgreementMember" xlink:label="loc_meecConsultingAgreementMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecConsultingAgreementMember" order="91"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MarchThirtyTwentytwentyOneMember" xlink:label="loc_meecMarchThirtyTwentytwentyOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecMarchThirtyTwentytwentyOneMember" order="92"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_BusinessDevelopmentAgreementMember" xlink:label="loc_meecBusinessDevelopmentAgreementMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_meecBusinessDevelopmentAgreementMember" order="93"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DecemberOneTwoThousandTwentyOneMember" xlink:label="loc_meecDecemberOneTwoThousandTwentyOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecDecemberOneTwoThousandTwentyOneMember" order="94"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TwoDirectorMember" xlink:label="loc_meecTwoDirectorMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecTwoDirectorMember" order="95"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MayOneTwoThousandTwentyOneMember" xlink:label="loc_meecMayOneTwoThousandTwentyOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecMayOneTwoThousandTwentyOneMember" order="96"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_FebruaryTwoTwoThousandTwentyTwoMember" xlink:label="loc_meecFebruaryTwoTwoThousandTwentyTwoMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecFebruaryTwoTwoThousandTwentyTwoMember" order="97"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JohnPavlishMember" xlink:label="loc_meecJohnPavlishMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecJohnPavlishMember" order="98"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JamesTrettelMember" xlink:label="loc_meecJamesTrettelMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyDomain" xlink:to="loc_meecJamesTrettelMember" order="99"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JamiSatterthwaiteMember" xlink:label="loc_meecJamiSatterthwaiteMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecJamiSatterthwaiteMember" order="100"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_TwoEmployeesMember" xlink:label="loc_meecTwoEmployeesMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapRelatedPartyTransactionDomain" xlink:to="loc_meecTwoEmployeesMember" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaapSellingGeneralAndAdministrativeExpensesMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapSellingGeneralAndAdministrativeExpensesMember" order="102"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_JanuaryTwoFourTwoThousandTwentyTwoMember" xlink:label="loc_meecJanuaryTwoFourTwoThousandTwentyTwoMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAwardDateDomain" xlink:to="loc_meecJanuaryTwoFourTwoThousandTwentyTwoMember" order="103"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="loc_srtMinimumMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMinimumMember" order="104"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember" order="105"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_IntrinsicValueMember" xlink:label="loc_meecIntrinsicValueMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_meecIntrinsicValueMember" order="106"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaapLaborAndRelatedExpense"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLaborAndRelatedExpense" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OptionExpiryTerm" xlink:label="loc_meecOptionExpiryTerm"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOptionExpiryTerm" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ExercisablePerShare" xlink:label="loc_meecExercisablePerShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecExercisablePerShare" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OptionValue" xlink:label="loc_meecOptionValue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOptionValue" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRatePercent" xlink:label="loc_meecShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRatePercent"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodExpectedVolatilityRatePercent" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesOther"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesOther" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesIssued" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OptionToPurchaseShare" xlink:label="loc_meecOptionToPurchaseShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOptionToPurchaseShare" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OptionexercisePrice" xlink:label="loc_meecOptionexercisePrice"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOptionexercisePrice" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_MarketPricePerShare" xlink:label="loc_meecMarketPricePerShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecMarketPricePerShare" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateAmount" xlink:label="loc_meecAggregateAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateAmount" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_StockIssuedForCashlessExerciseOfStockOptions" xlink:label="loc_meecStockIssuedForCashlessExerciseOfStockOptions"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockIssuedForCashlessExerciseOfStockOptions" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaapShareBasedCompensation"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensation" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AcquireAnAggregateOfShares" xlink:label="loc_meecAcquireAnAggregateOfShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAcquireAnAggregateOfShares" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_StockOptionValuedAmount" xlink:label="loc_meecStockOptionValuedAmount"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockOptionValuedAmount" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DescriptionOfExercisePrice" xlink:label="loc_meecDescriptionOfExercisePrice"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecDescriptionOfExercisePrice" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_OptionExercisePricePerShare" xlink:label="loc_meecOptionExercisePricePerShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecOptionExercisePricePerShare" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaapSaleOfStockPricePerShare"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSaleOfStockPricePerShare" order="22"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/WarrantsDetails" xlink:title="000052 - Disclosure - Warrants (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaapClassOfWarrantOrRightAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapClassOfWarrantOrRightAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsMember" xlink:label="loc_meecWarrantsMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfWarrantOrRightDomain" xlink:to="loc_meecWarrantsMember" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOfWarrantsBeginningBalance" xlink:label="loc_meecNumberOfWarrantsBeginningBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOfWarrantsBeginningBalance" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOfWarrantsGrants" xlink:label="loc_meecNumberOfWarrantsGrants"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOfWarrantsGrants" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOfWarrantsExpiration" xlink:label="loc_meecNumberOfWarrantsExpiration"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOfWarrantsExpiration" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOfWarrantsExercises" xlink:label="loc_meecNumberOfWarrantsExercises"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOfWarrantsExercises" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOfWarrantsEndingBalance" xlink:label="loc_meecNumberOfWarrantsEndingBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOfWarrantsEndingBalance" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsExercisableEndingBalance" xlink:label="loc_meecWarrantsExercisableEndingBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWarrantsExercisableEndingBalance" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceWarrantsBeginningBalance" xlink:label="loc_meecWeightedAverageExercisePriceWarrantsBeginningBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceWarrantsBeginningBalance" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceWarrantsGranted" xlink:label="loc_meecWeightedAverageExercisePriceWarrantsGranted"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceWarrantsGranted" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceWarrantsEpired" xlink:label="loc_meecWeightedAverageExercisePriceWarrantsEpired"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceWarrantsEpired" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceWarrantsExercised" xlink:label="loc_meecWeightedAverageExercisePriceWarrantsExercised"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceWarrantsExercised" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceEndingBalance" xlink:label="loc_meecWeightedAverageExercisePriceEndingBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceEndingBalance" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePriceExercisable" xlink:label="loc_meecWeightedAverageExercisePriceExercisable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePriceExercisable" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageRemainingContractualLifeYearsWarrantsBeginningBalance" xlink:label="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsBeginningBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsBeginningBalance" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageRemainingContractualLifeYearsWarrantsEndingBalance" xlink:label="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsEndingBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsEndingBalance" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageRemainingContractualLifeYearsWarrantsExercisable" xlink:label="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsExercisable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageRemainingContractualLifeYearsWarrantsExercisable" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueWarrantsBeginningBalance" xlink:label="loc_meecAggregateIntrinsicValueWarrantsBeginningBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueWarrantsBeginningBalance" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueWarrantsGrant" xlink:label="loc_meecAggregateIntrinsicValueWarrantsGrant"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueWarrantsGrant" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueWarrantsExpired" xlink:label="loc_meecAggregateIntrinsicValueWarrantsExpired"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueWarrantsExpired" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueWarrantsExercised" xlink:label="loc_meecAggregateIntrinsicValueWarrantsExercised"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueWarrantsExercised" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueExercisable" xlink:label="loc_meecAggregateIntrinsicValueExercisable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueExercisable" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_AggregateIntrinsicValueEndingBalance" xlink:label="loc_meecAggregateIntrinsicValueEndingBalance"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecAggregateIntrinsicValueEndingBalance" order="21"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/WarrantsDetails1" xlink:title="000053 - Disclosure - Warrants (Details 1)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaapClassOfWarrantOrRightAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapClassOfWarrantOrRightAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsMember" xlink:label="loc_meecWarrantsMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfWarrantOrRightDomain" xlink:to="loc_meecWarrantsMember" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantOneMember" xlink:label="loc_meecWarrantOneMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfWarrantOrRightDomain" xlink:to="loc_meecWarrantOneMember" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_NumberOutstanding" xlink:label="loc_meecNumberOutstanding"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecNumberOutstanding" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageExercisePrice" xlink:label="loc_meecWeightedAverageExercisePrice"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageExercisePrice" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WeightedAverageRemainingContractuaLifeYears" xlink:label="loc_meecWeightedAverageRemainingContractuaLifeYears"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWeightedAverageRemainingContractuaLifeYears" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_ExercisePriceWarrants" xlink:label="loc_meecExercisePriceWarrants"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecExercisePriceWarrants" order="4"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/WarrantsDetailsNarrative" xlink:title="000054 - Disclosure - Warrants (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtRangeAxis" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" order="30" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="loc_srtMinimumMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMinimumMember" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsIssuedUponCashlessExerciseOfWarrants" xlink:label="loc_meecWarrantsIssuedUponCashlessExerciseOfWarrants"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWarrantsIssuedUponCashlessExerciseOfWarrants" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsPurchaseUponCommonStockShares" xlink:label="loc_meecWarrantsPurchaseUponCommonStockShares"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWarrantsPurchaseUponCommonStockShares" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfWarrants" xlink:label="loc_us-gaapProceedsFromIssuanceOfWarrants"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProceedsFromIssuanceOfWarrants" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_WarrantsMarketValue" xlink:label="loc_meecWarrantsMarketValue"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecWarrantsMarketValue" order="5"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://meec.com/role/SubsequentEventsDetailsNarrative" xlink:title="000055 - Disclosure - Subsequent Events (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" order="2000" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaapSubsequentEventTypeAxis"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapSubsequentEventTypeAxis" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaapSubsequentEventTypeDomain"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapSubsequentEventTypeAxis" xlink:to="loc_us-gaapSubsequentEventTypeDomain" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaapSubsequentEventTypeDomain_10"/> |
| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaapSubsequentEventTypeAxis" xlink:to="loc_us-gaapSubsequentEventTypeDomain_10" order="40" xbrldt:contextElement="segment"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaapSubsequentEventMember"/> |
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| | <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_meecStockBonusAwardedToCfo" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DescriptionOfRetentionStockBonusVesting" xlink:label="loc_meecDescriptionOfRetentionStockBonusVesting"/> |
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| | <link:loc xlink:type="locator" xlink:href="meec-20220930.xsd#meec_DescriptionOfRepurchaseOptionAgreement" xlink:label="loc_meecDescriptionOfRepurchaseOptionAgreement"/> |
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