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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-03-02T21:49:26.6548900+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : 423543bad3af4a3bbef69259358214b0 -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="cece_OneMonthLiborMember" name="OneMonthLiborMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_BankGuaranteesMember" name="BankGuaranteesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_NetherlandsFacilityMember" name="NetherlandsFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EuroDenominatedBankGuaranteeMember" name="EuroDenominatedBankGuaranteeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_MaximumConsolidatedLeverageRatio" name="MaximumConsolidatedLeverageRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="cece_TwoThousandAndSeventeenPlanMember" name="TwoThousandAndSeventeenPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_TwoThousandSevenPlanMember" name="TwoThousandSevenPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_RestrictedStockAndPerformanceUnitsMember" name="RestrictedStockAndPerformanceUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EmployeeStockPurchasePlanDiscountFromMarketPrice" name="EmployeeStockPurchasePlanDiscountFromMarketPrice" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeesOfferingDatesIntervals" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeesOfferingDatesIntervals" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_EmployeeStockPurchasePlanNumberOfSharesAuthorized" name="EmployeeStockPurchasePlanNumberOfSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="cece_EmployeeStockPurchasePlanOfferPeriod" name="EmployeeStockPurchasePlanOfferPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_EmployeeStockPurchasePlanNumberOfSharesAvailableForGrant" name="EmployeeStockPurchasePlanNumberOfSharesAvailableForGrant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="cece_EmployeeStockPurchasePlanExpense" name="EmployeeStockPurchasePlanExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_ScheduleOfSummaryOfRestrictedStockUnitActivityLineItems" name="ScheduleOfSummaryOfRestrictedStockUnitActivityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_ScheduleOfSummaryOfRestrictedStockUnitActivityTable" name="ScheduleOfSummaryOfRestrictedStockUnitActivityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_TwoThousandAndSevenPlanMember" name="TwoThousandAndSevenPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_ScheduleOfSaleOfSubsidiaryAbstract" name="ScheduleOfSaleOfSubsidiaryAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_DefinedBenefitAndContributionPlanDisclosureLineItems" name="DefinedBenefitAndContributionPlanDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_ScheduleOfDefinedBenefitAndContributionPlanDisclosureTable" name="ScheduleOfDefinedBenefitAndContributionPlanDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_MultiemployerPlanZoneByTypeAxis" name="MultiemployerPlanZoneByTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_MultiemployerPlanZoneByTypeDomain" name="MultiemployerPlanZoneByTypeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_YellowZoneMember" name="YellowZoneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_RedZoneMember" name="RedZoneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_GreenZoneMember" name="GreenZoneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EmployeeDeferralCategoryOneMember" name="EmployeeDeferralCategoryOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EmployeeDeferralCategoryTwoMember" name="EmployeeDeferralCategoryTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_DefinedBenefitPlansAndOtherPostretirementBenefitPlansLineItems" name="DefinedBenefitPlansAndOtherPostretirementBenefitPlansLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTable" name="DefinedBenefitPlansAndOtherPostretirementBenefitPlansTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_SheetMetalWorkersNationalPensionFundMember" name="SheetMetalWorkersNationalPensionFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_SheetMetalWorkersLocalTwoTwoFourPensionPlanMember" name="SheetMetalWorkersLocalTwoTwoFourPensionPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_SheetMetalWorkersLocalOneSevenSevenPensionFundMember" name="SheetMetalWorkersLocalOneSevenSevenPensionFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_PercentageOfEmployeeSalaryDeferralProvision" name="PercentageOfEmployeeSalaryDeferralProvision" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_DefinedContributionPlanEmployerMatchingContributionPercentOne" name="DefinedContributionPlanEmployerMatchingContributionPercentOne" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercentOne" name="DefinedContributionPlanMaximumAnnualContributionPerEmployeePercentOne" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="cece_DefinedContributionPlanEmployerMaximumMatchingContributionPercent" name="DefinedContributionPlanEmployerMaximumMatchingContributionPercent" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_FinanceLeaseCost" name="FinanceLeaseCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_OperatingLeasesAbstract" name="OperatingLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_FinanceLeasesAbstract" name="FinanceLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_WeightedAverageRemainingLeaseTermAbstract" name="WeightedAverageRemainingLeaseTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_WeightedAverageDiscountRateAbstract" name="WeightedAverageDiscountRateAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_LitigationAndSettlementAwardedFromInsurers" name="LitigationAndSettlementAwardedFromInsurers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_AverageCostPerSettledClaim" name="AverageCostPerSettledClaim" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_LiabilityForDeferredTaxesOnUndistributedForeignEarnings" name="LiabilityForDeferredTaxesOnUndistributedForeignEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="cece_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_StateAndForeignAuthoritiesMember" name="StateAndForeignAuthoritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_IncreaseDecreaseInTaxResultingAbstract" name="IncreaseDecreaseInTaxResultingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_DeferredTaxAssetsMinimumPension" name="DeferredTaxAssetsMinimumPension" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_DeferredTaxAssetsDepreciation" name="DeferredTaxAssetsDepreciation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_DeferredTaxLiabilitiesPrepaidExpensesAndInventory" name="DeferredTaxLiabilitiesPrepaidExpensesAndInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="cece_StateAndLocalNetOperatingLossCarryForwardsYearStart" name="StateAndLocalNetOperatingLossCarryForwardsYearStart" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_StateAndLocalNetOperatingLossCarryForwardsYearEnd" name="StateAndLocalNetOperatingLossCarryForwardsYearEnd" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_AdditionalIncomeTaxExpenseBenefit" name="AdditionalIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_MinimumLikelihoodForRecognizedIncomeTaxPositions" name="MinimumLikelihoodForRecognizedIncomeTaxPositions" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="cece_CommitmentContingencyAndRelatedPartyTransactionsAbstract" name="CommitmentContingencyAndRelatedPartyTransactionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_ConsultingServicesMember" name="ConsultingServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_RelatedPartyOneMember" name="RelatedPartyOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_IncreaseInEstimatedFairValueOfEarnout" name="IncreaseInEstimatedFairValueOfEarnout" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_CustomerListsAndTradeNameMember" name="CustomerListsAndTradeNameMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_MaderMachineCompanyMember" name="MaderMachineCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_VotingInterestInJointVenture" name="VotingInterestInJointVenture" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="cece_EnvironmentalIntegratedSolutionsAndMaderHoldingsLPMember" name="EnvironmentalIntegratedSolutionsAndMaderHoldingsLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_ProceedsFromDivestitureOfBusinessesGross" name="ProceedsFromDivestitureOfBusinessesGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_DisposalGroupIncludingDiscontinuedOperationTransactionCosts" name="DisposalGroupIncludingDiscontinuedOperationTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="cece_StrobicAirCorporationMember" name="StrobicAirCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_KeystoneFilterBrandMember" name="KeystoneFilterBrandMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_JiangyinZhongliIndustrialTechnologyCoLtdMember" name="JiangyinZhongliIndustrialTechnologyCoLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_CECOGroupIncMember" name="CECOGroupIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_MiddleEastAndAfricaMember" name="MiddleEastAndAfricaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_CorporateReconcilingItemsAndEliminationsMember" name="CorporateReconcilingItemsAndEliminationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_IndustrialInterSegmentSalesMember" name="IndustrialInterSegmentSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EnergyInterSegmentSalesMember" name="EnergyInterSegmentSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_FluidHandlingFiltrationInterSegmentSalesMember" name="FluidHandlingFiltrationInterSegmentSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="cece_EntityWideDisclosureOnGeographicSalesInForeignCountriesPercentage" name="EntityWideDisclosureOnGeographicSalesInForeignCountriesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</xsd:schema>
