Designation:D6161−19StandardTerminologyUsedforMicrofiltration,Ultrafiltration,Nanofiltration,andReverseOsmosisMembraneProcesses1ThisstandardisissuedunderthefixeddesignationD6161;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologycoverstheuseofmicrofiltration,ultrafiltration,nanofiltration,andreverseosmosisformem-braneseparationprocesses.1.2Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD2035PracticeforCoagulation-FlocculationJarTestofWaterD3739PracticeforCalculationandAdjustmentoftheLangelierSaturationIndexforReverseOsmosisD4582PracticeforCalculationandAdjustmentoftheStiffandDavisStabilityIndexforReverseOsmosis(With-drawn2019)33.Summary3.1Thisterminologyiscommontomembraneseparationprocessesbutindependentofthesourceofmanufacture.4.SignificanceandUse4.1Theneedtounderstandtherelationshipsfoundinmembraneunitprocessesforwatertreatmentincreaseswiththecontinuingdemandfortheseseparationsystems.Definingthetermscommontomicrofiltration,ultrafiltration,nanofiltration,andreverseosmosisprocessesassistthemanufacturer,consultant,andend-userineliminatinginter-processterminol-ogyconfusion.ThisstandardexpandsthedefinitionsfoundinTerminologyD1129.5.Terminology5.1Definitions:absolutefilterrating,n—particlesizeabovewhich100%ofparticlesthataretrappedonorwithinthefiltermedium.absorption,n—thereleasefordesorptionholdingofasub-stancewithinasolidbycohesiveorcapillaryforces.accumulator,n—apulsationdampenerinstalledonthesuctionand/ordischargelinesofpumps,general...
