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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_VariableRateDomain_637955847413163429" xlink:to="hdsn_ApplicableLeverageRationMember_637955847413163429" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember" xlink:label="hdsn_SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember_637955847413163429"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_VariableRateDomain_637955847413163429" xlink:to="hdsn_SecuredOvernightFinancingRatePlusApplicableLeverageRatioMember_637955847413163429" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis_637955847413163429"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementTable_637955847413143345" xlink:to="us-gaap_ShortTermDebtTypeAxis_637955847413163429" order="5" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ShortTermDebtTypeAxis_637955847413163429" xlink:to="us-gaap_ShortTermDebtTypeDomain_637955847413173415" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_FCCRMember" xlink:label="hdsn_FCCRMember_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ShortTermDebtTypeDomain_637955847413173415" xlink:to="hdsn_FCCRMember_637955847413173415" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementTable_637955847413143345" xlink:to="us-gaap_LongtermDebtTypeAxis_637955847413173415" order="6" use="optional" priority="2"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeAxis_637955847413173415" xlink:to="us-gaap_LongtermDebtTypeDomain_637955847413173415" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_PaycheckProtectionProgramMember" xlink:label="hdsn_PaycheckProtectionProgramMember_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_LongtermDebtTypeDomain_637955847413173415" xlink:to="hdsn_PaycheckProtectionProgramMember_637955847413173415" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementTable_637955847413143345" xlink:to="us-gaap_DebtInstrumentAxis_637955847413173415" order="7" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_637955847413173415"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentAxis_637955847413173415" xlink:to="us-gaap_DebtInstrumentNameDomain_637955847413173415" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_CaresActLoanMember" xlink:label="hdsn_CaresActLoanMember_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_637955847413173415" xlink:to="hdsn_CaresActLoanMember_637955847413183414" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementTable_637955847413143345" xlink:to="srt_StatementScenarioAxis_637955847413183414" order="8" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_StatementScenarioAxis_637955847413183414" xlink:to="srt_ScenarioUnspecifiedDomain_637955847413183414" order="1" use="optional"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_FirstInLastOutTrancheMember" xlink:label="hdsn_FirstInLastOutTrancheMember_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ScenarioUnspecifiedDomain_637955847413183414" xlink:to="hdsn_FirstInLastOutTrancheMember_637955847413183414" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember" xlink:label="hdsn_SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ScenarioUnspecifiedDomain_637955847413183414" xlink:to="hdsn_SecuredOvernightFinancingRateAndFirstInLastOutTrancheMember_637955847413183414" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementTable_637955847413143345" xlink:to="us-gaap_StatementLineItems_637955847413183414" order="9" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtInstrumentLeverageRatioRequired" xlink:label="hdsn_DebtInstrumentLeverageRatioRequired_637955847413183414"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtInstrumentLeverageRatioRequired_637955847413183414" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_637955847413193445"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_637955847413193445" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_637955847413193445"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_637955847413193445" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtInstrumentAdditionalPercentagePointsInterest" xlink:label="hdsn_DebtInstrumentAdditionalPercentagePointsInterest_637955847413193445"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtInstrumentAdditionalPercentagePointsInterest_637955847413193445" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability" xlink:label="hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability_637955847413263416"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_LineOfCreditFacilityCovenantComplianceMinimumLiquidityToBeDerivedFromAvailability_637955847413263416" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_MinimumAggregateUndrawnLoanAvailability" xlink:label="hdsn_MinimumAggregateUndrawnLoanAvailability_637955847413273167"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_MinimumAggregateUndrawnLoanAvailability_637955847413273167" order="6" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_FixedChargesCoverageRatio" xlink:label="hdsn_FixedChargesCoverageRatio_637955847413273167"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_FixedChargesCoverageRatio_637955847413273167" order="7" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_PeriodForFixedChargeCoverageRatio" xlink:label="hdsn_PeriodForFixedChargeCoverageRatio_637955847413273167"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_PeriodForFixedChargeCoverageRatio_637955847413273167" order="8" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="us-gaap_DebtInstrumentFaceAmount_637955847413273167"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_DebtInstrumentFaceAmount_637955847413273167" order="9" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_637955847413273167"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_637955847413273167" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredOfferingCosts" xlink:label="us-gaap_DeferredOfferingCosts_637955847413283437"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_DeferredOfferingCosts_637955847413283437" order="11" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebt" xlink:label="us-gaap_UnsecuredDebt_637955847413283437"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_UnsecuredDebt_637955847413283437" order="12" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="4"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtTerm" xlink:label="us-gaap_LongTermDebtTerm_637955847413283437"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_LongTermDebtTerm_637955847413283437" order="13" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="4"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtInstrumentInterestDeferralTerm" xlink:label="hdsn_DebtInstrumentInterestDeferralTerm_637955847413283437"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtInstrumentInterestDeferralTerm_637955847413283437" order="14" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationPeriod" xlink:label="us-gaap_LineOfCreditFacilityExpirationPeriod_637955847413283437"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_LineOfCreditFacilityExpirationPeriod_637955847413283437" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtPrepaymentPremiumPercentageYearOne" xlink:label="hdsn_DebtPrepaymentPremiumPercentageYearOne_637955847413293552"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtPrepaymentPremiumPercentageYearOne_637955847413293552" order="16" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtPrepaymentPremiumPercentageYearTwo" xlink:label="hdsn_DebtPrepaymentPremiumPercentageYearTwo_637955847413293552"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtPrepaymentPremiumPercentageYearTwo_637955847413293552" order="17" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtPrepaymentPremiumPercentageYearThree" xlink:label="hdsn_DebtPrepaymentPremiumPercentageYearThree_637955847413293552"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtPrepaymentPremiumPercentageYearThree_637955847413293552" order="18" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter" xlink:label="hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter_637955847413293552"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_DebtPrepaymentPremiumPercentageYearFourAndThereafter_637955847413293552" order="19" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="5"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_PaymentsProtectionProgramForgiveness" xlink:label="hdsn_PaymentsProtectionProgramForgiveness_637955847413303224"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_PaymentsProtectionProgramForgiveness_637955847413303224" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="us-gaap_ProceedsFromLinesOfCredit_637955847413303224"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_ProceedsFromLinesOfCredit_637955847413303224" order="21" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum" xlink:label="hdsn_PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum_637955847413303224"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="hdsn_PrincipalPaymentAsPercentageOfOriginalPrincipalAmountOfOutstandingTermLoanPerAnnum_637955847413303224" order="22" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="us-gaap_DebtInstrumentCarryingAmount_637955847413303224"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_StatementLineItems_637955847413183414" xlink:to="us-gaap_DebtInstrumentCarryingAmount_637955847413303224" order="23" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="1"/> |
| | <loc xlink:type="locator" xlink:href="hdsn-20220630.xsd#hdsn_DebtInstrumentPaymentExcessCashFlowAmount" xlink:label="hdsn_DebtInstrumentPaymentExcessCashFlowAmount_637955847413313301"/> |
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