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Hudson Technologies Inc./NY – ‘10-Q’ for 9/30/22 – ‘EX-101.SCH’

On:  Tuesday, 11/8/22, at 5:28pm ET   ·   For:  9/30/22   ·   Accession #:  1410578-22-3028   ·   File #:  1-13412

Previous ‘10-Q’:  ‘10-Q’ on 8/8/22 for 6/30/22   ·   Next:  ‘10-Q’ on 5/9/23 for 3/31/23   ·   Latest:  ‘10-Q’ on 5/8/24 for 3/31/24   ·   1 Reference:  By:  Hudson Technologies Inc./NY – ‘S-3’ on 1/13/23

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

11/08/22  Hudson Technologies Inc./NY       10-Q        9/30/22   53:5.3M                                   Toppan Merrill/FA2

Quarterly Report   —   Form 10-Q

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.24M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     22K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     22K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     18K 
 5: EX-32.2     Certification -- §906 - SOA'02                      HTML     18K 
11: R1          Document and Entity Information                     HTML     70K 
12: R2          Consolidated Balance Sheets                         HTML    116K 
13: R3          Consolidated Balance Sheets (Parenthetical)         HTML     38K 
14: R4          Consolidated Statements of Income                   HTML     99K 
15: R5          Consolidated Statements of Stockholders' Equity     HTML     62K 
16: R6          Consolidated Statements of Cash Flows               HTML    103K 
17: R7          Summary of Significant Accounting Policies          HTML     80K 
18: R8          Fair Value                                          HTML     21K 
19: R9          Inventories                                         HTML     30K 
20: R10         Property, plant and equipment                       HTML     61K 
21: R11         Leases                                              HTML     47K 
22: R12         Goodwill and intangible assets                      HTML     72K 
23: R13         Share-based compensation                            HTML     62K 
24: R14         Short-term and Long-term debt                       HTML     75K 
25: R15         Summary of Significant Accounting Policies          HTML    119K 
                (Policies)                                                       
26: R16         Summary of Significant Accounting Policies          HTML     44K 
                (Tables)                                                         
27: R17         Inventories (Tables)                                HTML     30K 
28: R18         Property, plant and equipment (Tables)              HTML     59K 
29: R19         Leases (Tables)                                     HTML     47K 
30: R20         Goodwill and intangible assets (Tables)             HTML     71K 
31: R21         Share-based compensation (Tables)                   HTML     57K 
32: R22         Short-term and Long-term debt (Tables)              HTML     53K 
33: R23         Summary of Significant Accounting Policies -        HTML     69K 
                Additional Information (Details)                                 
34: R24         Summary of Significant Accounting Policies -        HTML     37K 
                Reconciliation of shares used to determine net                   
                income per share (Details)                                       
35: R25         Inventories (Details)                               HTML     23K 
36: R26         Property, plant and equipment - Summary of          HTML     75K 
                elements of property, plant and equipment                        
                (Details)                                                        
37: R27         Property, plant and equipment - Additional          HTML     18K 
                Information (Details)                                            
38: R28         Leases - Maturity of lease payments (Details)       HTML     35K 
39: R29         Leases - Balance Sheet Classification and Other     HTML     31K 
                Information (Details)                                            
40: R30         Leases - Additional Information (Details)           HTML     25K 
41: R31         Goodwill and intangible assets - Company's other    HTML     41K 
                intangible assets (Details)                                      
42: R32         Goodwill and intangible assets - Additional         HTML     26K 
                Information (Details)                                            
43: R33         Share-based compensation - Summary of the activity  HTML     40K 
                for stock options issued under the Company's Plans               
                (Details)                                                        
44: R34         Share-based compensation - Weighted average         HTML     28K 
                contractual life in years and the weighted average               
                exercise price (Details)                                         
45: R35         Share-based compensation - Additional Information   HTML     64K 
                (Details)                                                        
46: R36         Short-term and Long-term debt (Details)             HTML     34K 
47: R37         Short-term and Long-term debt - Maturities of       HTML     28K 
                long-term debt and capital lease obligations                     
                (Details)                                                        
48: R38         Short-term and Long-term debt - Additional          HTML    126K 
                Information (Details)                                            
51: XML         IDEA XML File -- Filing Summary                      XML     91K 
49: XML         XBRL Instance -- hdsn-20220930x10q_htm               XML   1.30M 
50: EXCEL       IDEA Workbook of Financial Reports                  XLSX    105K 
 7: EX-101.CAL  XBRL Calculations -- hdsn-20220930_cal               XML    139K 
 8: EX-101.DEF  XBRL Definitions -- hdsn-20220930_def                XML    344K 
 9: EX-101.LAB  XBRL Labels -- hdsn-20220930_lab                     XML    799K 
10: EX-101.PRE  XBRL Presentations -- hdsn-20220930_pre              XML    581K 
 6: EX-101.SCH  XBRL Schema -- hdsn-20220930                         XSD    116K 
52: JSON        XBRL Instance as JSON Data -- MetaLinks              286±   428K 
53: ZIP         XBRL Zipped Folder -- 0001410578-22-003028-xbrl      Zip    236K

‘EX-101.SCH’   —   XBRL Schema — hdsn-20220930

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="hdsn-20220930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
</xsd:appinfo>
</xsd:annotation>
<xsd:import namespace="http://xbrl.sec.gov/dei/2022" schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
<xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd"/>
<xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
<xsd:import namespace="http://fasb.org/us-roles/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd"/>
<xsd:import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd"/>
<xsd:import namespace="http://fasb.org/srt/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd"/>
<xsd:element id="hdsn_LowerOfCostOrNetRealizableValueAdjustment" name="LowerOfCostOrNetRealizableValueAdjustment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element id="hdsn_ScheduleOfOperatingLeaseInBalanceSheetClassificationTableTextBlock" name="ScheduleOfOperatingLeaseInBalanceSheetClassificationTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="false"/>
<xsd:element id="hdsn_ScheduleOfOperatingLeaseOtherInformationTableTextBlock" name="ScheduleOfOperatingLeaseOtherInformationTableTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="SignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SignificantAccountingPoliciesTable" substitutionGroup="xbrldt:hypercubeItem"/>
<xsd:element name="SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SignificantAccountingPoliciesLineItems" substitutionGroup="xbrli:item"/>
<xsd:element name="ExpirationPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ExpirationPeriodAxis" substitutionGroup="xbrldt:dimensionItem"/>
<xsd:element name="ExpirationPeriodDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ExpirationPeriodDomain" substitutionGroup="xbrli:item"/>
<xsd:element name="CylindersMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_CylindersMember" substitutionGroup="xbrli:item"/>
<xsd:element name="BalanceSheetClassificationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_BalanceSheetClassificationAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="OtherInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_OtherInformationAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="StockOptionPlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_StockOptionPlanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAbstract" substitutionGroup="xbrli:item"/>
<xsd:element name="TwoThousandAndFourteenStockIncentivePlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TwoThousandAndFourteenStockIncentivePlanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="TwoThousandAndEighteenStockIncentivePlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TwoThousandAndEighteenStockIncentivePlanMember" substitutionGroup="xbrli:item"/>
<xsd:element id="hdsn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAggregateIntrinsicValueNonvested" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAggregateIntrinsicValueNonvested" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" abstract="false"/>
<xsd:element id="hdsn_LongtermDebtCurrentNetOfOtherDebt" name="LongtermDebtCurrentNetOfOtherDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element name="TermLoanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_TermLoanMember" substitutionGroup="xbrli:item"/>
<xsd:element name="FCCRMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_FCCRMember" substitutionGroup="xbrli:item"/>
<xsd:element name="SwingLineLoanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hdsn_SwingLineLoanMember" substitutionGroup="xbrli:item"/>
<xsd:element id="hdsn_FixedChargesCoverageRatio" name="FixedChargesCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_LongTermDebtNonCurrentNetOfOtherDebt" name="LongTermDebtNonCurrentNetOfOtherDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_DebtInstrumentLeverageRatioRequired" name="DebtInstrumentLeverageRatioRequired" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_OneCustomerMember" name="OneCustomerMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_NoCustomerMember" name="NoCustomerMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_AmendedAndRestatedRevolvingCreditAndSecurityAgreementMember" name="AmendedAndRestatedRevolvingCreditAndSecurityAgreementMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtInstrumentAdditionalPercentagePointsInterest" name="DebtInstrumentAdditionalPercentagePointsInterest" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_TermLoanFacilityMember" name="TermLoanFacilityMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearTwo" name="DebtPrepaymentPremiumPercentageYearTwo" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearThree" name="DebtPrepaymentPremiumPercentageYearThree" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter" name="DebtPrepaymentPremiumPercentageYearFourAndThereafter" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant"/>
<xsd:element id="hdsn_PropertyLocationAxis" name="PropertyLocationAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_PropertyLocationDomain" name="PropertyLocationDomain" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_MinimumAggregateUndrawnLoanAvailability" name="MinimumAggregateUndrawnLoanAvailability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit"/>
<xsd:element id="hdsn_IncreaseDecreaseInLeaseObligations" name="IncreaseDecreaseInLeaseObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit"/>
<xsd:element id="hdsn_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_WellsFargoMember" name="WellsFargoMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidity" name="LineOfCreditFacilityCovenantComplianceMinimumLiquidity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability" name="LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit"/>
<xsd:element id="hdsn_PeriodForFixedChargeCoverageRatio" name="PeriodForFixedChargeCoverageRatio" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_CylinderDepositValue" name="CylinderDepositValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" abstract="false"/>
<xsd:element id="hdsn_CaresActLoanMember" name="CaresActLoanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_PaycheckProtectionProgramMember" name="PaycheckProtectionProgramMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_DebtInstrumentInterestDeferralTerm" name="DebtInstrumentInterestDeferralTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xsd:element id="hdsn_TwoThousandAndTwentyStockIncentivePlanMember" name="TwoThousandAndTwentyStockIncentivePlanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration"/>
<xsd:element id="hdsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueNonVested" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueNonVested" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" abstract="false"/>
<xsd:element name="PaymentProtectionProgramForgiveness" id="hdsn_PaymentProtectionProgramForgiveness" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="SecuredOvernightFinancingRateMember" id="hdsn_SecuredOvernightFinancingRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember" id="hdsn_SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="DebtPrepaymentPremiumPercentageYearOne" id="hdsn_DebtPrepaymentPremiumPercentageYearOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="DebtInstrumentPaymentExcessCashFlowAmount" id="hdsn_DebtInstrumentPaymentExcessCashFlowAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="RevolvingCreditFacilityAmendmentMember" id="hdsn_RevolvingCreditFacilityAmendmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="FirstInLastOutTrancheMember" id="hdsn_FirstInLastOutTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember" id="hdsn_SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PrimeCommercialLendingRateOfWellsFargoMember" id="hdsn_PrimeCommercialLendingRateOfWellsFargoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PercentageOfStepdownFromBaselineLevelsFinalRule" id="hdsn_PercentageOfStepdownFromBaselineLevelsFinalRule" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="PercentageOfCumulativeReductionFromBaselineLevelsSubsequentAllowance" id="hdsn_PercentageOfCumulativeReductionFromBaselineLevelsSubsequentAllowance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="AllocationAllowanceReceivedByCompanyAsPercentageOfHydrofluorocarbonsConsumption" id="hdsn_AllocationAllowanceReceivedByCompanyAsPercentageOfHydrofluorocarbonsConsumption" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="NetOperatingLoss" id="hdsn_NetOperatingLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit"/>
<xsd:element name="LongTermDebtFirstInLastOutFilo" id="hdsn_LongTermDebtFirstInLastOutFilo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit"/>
<xsd:element name="AmortizationOfDeferredFinancingCosts" id="hdsn_AmortizationOfDeferredFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" id="hdsn_AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="ExcessTaxBenefitsFromShareBasedCompensationFinancingActivities" id="hdsn_ExcessTaxBenefitsFromShareBasedCompensationFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="PaymentsProtectionProgramForgiveness" id="hdsn_PaymentsProtectionProgramForgiveness" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit"/>
<xsd:element name="NatureOfOperationsPolicyPolicyTextBlock" id="hdsn_NatureOfOperationsPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="CylinderDepositLiabilityPolicyPolicyTextBlock" id="hdsn_CylinderDepositLiabilityPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="TwentyTwentyTwoTermLoanFacilityMember" id="hdsn_TwentyTwentyTwoTermLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="ApplicableLeverageRatioMember" id="hdsn_ApplicableLeverageRatioMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true"/>
<xsd:element name="PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum" id="hdsn_PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="AllocationAllowanceReceived" id="hdsn_AllocationAllowanceReceived" type="dtr-types:massItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
<xsd:element name="PercentageOfExcessCashFlowInWhichAnnualPaymentsMade" id="hdsn_PercentageOfExcessCashFlowInWhichAnnualPaymentsMade" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false"/>
</xsd:schema>

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