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  <import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd" />
  <element id="scwo_PreferredStockSharesDesignated" name="PreferredStockSharesDesignated" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfSharesOfCommonStockForOptionExerciseShares" name="IssuanceOfSharesOfCommonStockForOptionExerciseShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfSharesOfCommonStockForOptionExerciseAmount" name="IssuanceOfSharesOfCommonStockForOptionExerciseAmount" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfVestedRestrictedCommonStockShares" name="IssuanceOfVestedRestrictedCommonStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfVestedRestrictedCommonStockAmount" name="IssuanceOfVestedRestrictedCommonStockAmount" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RecognitionOfInitialRouAssetAndOperatingLeaseLiability" name="RecognitionOfInitialRouAssetAndOperatingLeaseLiability" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_WarrantsIssuedWithConvertibleNotesRecordedAsDebtDiscount" name="WarrantsIssuedWithConvertibleNotesRecordedAsDebtDiscount" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfSharesOfCommonStockForVestedRestrictedStockUnits" name="IssuanceOfSharesOfCommonStockForVestedRestrictedStockUnits" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfSharesOfCommonStockForCashlessStockOptionExercises" name="IssuanceOfSharesOfCommonStockForCashlessStockOptionExercises" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueDisclosureTextBlock" name="RevenueDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_AccountsReceivablesPolicyTextBlock" name="AccountsReceivablesPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfDepreciationExpenseTableTextBlock" name="ScheduleOfDepreciationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfUnbilledAccountsReceivableTableTextBlock" name="ScheduleOfUnbilledAccountsReceivableTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfStockBasedCompensationRelatedToStockOptionAndRsuExpectedToVestPresentInOperationsTableTextBlock" name="ScheduleOfStockBasedCompensationRelatedToStockOptionAndRsuExpectedToVestPresentInOperationsTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfRightOfUseAssetsTableTextBlock" name="ScheduleOfRightOfUseAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfOperatingLeaseLiabilitiesTableTextBlock" name="ScheduleOfOperatingLeaseLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfFutureMinimumRentalPaymentForOperatingLeasesTableTextBlock" name="ScheduleOfFutureMinimumRentalPaymentForOperatingLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ScheduleOfSupplementalCashFlowInformationRelatedToLeaseTableTextBlock" name="ScheduleOfSupplementalCashFlowInformationRelatedToLeaseTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_AccountsReceivableFromRightsConcentrationRiskPercentage" name="AccountsReceivableFromRightsConcentrationRiskPercentage" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenuesFromRightsConcentrationRiskPercentage" name="RevenuesFromRightsConcentrationRiskPercentage" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ReductionOfEquipmentRevenue" name="ReductionOfEquipmentRevenue" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_PrincipalTermsOfThePurchaseOrderDescription" name="PrincipalTermsOfThePurchaseOrderDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueRecognitionMilestoneMethod" name="RevenueRecognitionMilestoneMethod" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueReceiveAsConsideration" name="RevenueReceiveAsConsideration" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ContractLossProvision" name="ContractLossProvision" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_DescriptionOfRemainingAvailabilityUnderSalesAgreement" name="DescriptionOfRemainingAvailabilityUnderSalesAgreement" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYear" name="LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYear" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_DebtInstrumentMaturityDates" name="DebtInstrumentMaturityDates" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RepaymentObligationIncludingInterest" name="RepaymentObligationIncludingInterest" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenuePercentage" name="RevenuePercentage" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_PremiumsRevenuePercentage" name="PremiumsRevenuePercentage" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_BillingsDeferredRevenue" name="BillingsDeferredRevenue" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueRecognitionOfPriorUnearned" name="RevenueRecognitionOfPriorUnearned" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_UnbilledAccountsReceivable" name="UnbilledAccountsReceivable" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2Beginning" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2Beginning" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2Ending" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2Ending" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesIssuedWithConvertibleNotes" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesIssuedWithConvertibleNotes" nillable="true" xbrli:periodType="duration" type="num:perShareItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedOutstandingIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedOutstandingIntrinsicValue" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsRepurchasedOutstandingIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsRepurchasedOutstandingIntrinsicValue" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2EndingBalance" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2EndingBalance" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_CommonStockIssuedForCashlessServices" name="CommonStockIssuedForCashlessServices" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuanceOfShares" name="IssuanceOfShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_NumberOfOptionIncludePerformanceConditions" name="NumberOfOptionIncludePerformanceConditions" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriod" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_IssuedSharesOfCommonStockEmployeesForVested" name="IssuedSharesOfCommonStockEmployeesForVested" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_PerformanceBasedVestingConditionsForRestrictedStockUnitsDescription" name="PerformanceBasedVestingConditionsForRestrictedStockUnitsDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueTarget" name="RevenueTarget" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_AchiveRevenueTarget" name="AchiveRevenueTarget" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_DiscountRateOfLease" name="DiscountRateOfLease" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RentExpense" name="RentExpense" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_OperatingLeaseRightOfUseAssetAndOperatingLiabilities" name="OperatingLeaseRightOfUseAssetAndOperatingLiabilities" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_InitialMonthlyLicenseeFee" name="InitialMonthlyLicenseeFee" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_DescriptionOfInvestmentCompanyCapitalShareTransactionsStockRepurchased" name="DescriptionOfInvestmentCompanyCapitalShareTransactionsStockRepurchased" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_AnnualBaseSalaryPayment" name="AnnualBaseSalaryPayment" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_AnnualSalaryDescription" name="AnnualSalaryDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_DebtObligationsAbstract" name="DebtObligationsAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element id="scwo_RevenueAbstract" name="RevenueAbstract" nillable="true" abstract="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
  <element name="TwoCustomerMember" id="scwo_TwoCustomerMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="RevenueMember" id="scwo_RevenueMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="OptionsMember" id="scwo_OptionsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="UnvestedRestrictedStockMember" id="scwo_UnvestedRestrictedStockMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="OneCustomerMember" id="scwo_OneCustomerMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TwoZeroTwoOneEquityIncentivePlanMember" id="scwo_TwoZeroTwoOneEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="GeneralAndAdministrativeExpensesMember" id="scwo_GeneralAndAdministrativeExpensesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="ResearchAndDevelopmentExpensesMember" id="scwo_ResearchAndDevelopmentExpensesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="EmployeeStockOptionsMember" id="scwo_EmployeeStockOptionsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="VestUponAchievementOfFifityPercentTargetMember" id="scwo_VestUponAchievementOfFifityPercentTargetMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="VestUponAchievementOfFifityPercentRevenueTargetMember" id="scwo_VestUponAchievementOfFifityPercentRevenueTargetMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TwoNonEmployeeDirectorsMember" id="scwo_TwoNonEmployeeDirectorsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="OneNonEmployeeDirectorsMember" id="scwo_OneNonEmployeeDirectorsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="UnvestedPerformanceBasedRSUsMember" id="scwo_UnvestedPerformanceBasedRSUsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="UnvestedTmeBasedRSUsMember" id="scwo_UnvestedTmeBasedRSUsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="EquipmentRevenuesMember" id="scwo_EquipmentRevenuesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="ServiceRevenueMember" id="scwo_ServiceRevenueMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="FullScaleDemonstrationMember" id="scwo_FullScaleDemonstrationMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="FinancingAgreementMember" id="scwo_FinancingAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="EquipmentInProgressMember" id="scwo_EquipmentInProgressMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="CompensationAndRelatedExpensesMember" id="scwo_CompensationAndRelatedExpensesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="SeriesDConvertiblePreferredStockMember" id="scwo_SeriesDConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TwoZeroTwoOnePlanMember" id="scwo_TwoZeroTwoOnePlanMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="VestUponAchievementOfTwentyPercentRevenueTargetMember" id="scwo_VestUponAchievementOfTwentyPercentRevenueTargetMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="EquipmentDemoSystemMember" id="scwo_EquipmentDemoSystemMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TreatabilityStudyServicesMember" id="scwo_TreatabilityStudyServicesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TwentyTwentyFiveMember" id="scwo_TwentyTwentyFiveMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="WarrantsMember" id="scwo_WarrantsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="BottomMember" id="scwo_BottomMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TopMember" id="scwo_TopMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="TimeBasedRSUsMember" id="scwo_TimeBasedRSUsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="BoardOfDirectorsMember" id="scwo_BoardOfDirectorsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
  <element name="NonAffiliateMember" id="scwo_NonAffiliateMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
</schema>
