【英文标准名称】:StandardTestMethodforDeterminingBiodegradabilityofOrganicChemicalsinSemi-ContinuousActivatedSludge(SCAS)
【原文标准名称】:半连续活性污泥(SCAS)中有机化合物生物降解能力测定的标准试验方法
【标准号】:ASTME1625-1994(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1994
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E47.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Dissolvedorganicchemicals;Henry'sConstant;Hydrolysis;Microorganisms;Organicchemicals;Oxidationtesting;Sludge;Volatility;Wastewatertesting/treatment;Adsorption;Biodegradation;Chemicals(environmentalanalysis
【摘要】:Secondarywastewatertreatmentusingactivatedsludgeisoneofthemostimportantbiologicaltreatmentprocessesinusetoday.Thesemi-continuousactivatedsludge(SCAS)testemploysactivatedsludgefromadomesticactivatedsludgeplanttoassessbiodegradationoforganiccompounds.TheSCASsystemprovidesahighpotentialforbiodegradationbecauseofthehighbiomasstochemicalsubstrateratio,theregularreinoculationwithavarietyofmicroorganismsfromthenaturalsewage,thepossibilityofco-metabolismbecauseofthevarietyoforganicsubstratespresentinsewageorsyntheticfeed,theopportunityforslow-growingmicroorganismstoberetainedduetothehighsludgeage,andalonghydraulicretentiontimetoincreaseselectionpressure.1.1Thistestmethodcoversproceduresforthedeterminationofthebiodegradabilityorremovability,orboth,ofnonvolatileorganicchemicals(Henry''sConstantx003C;10x2212;3atm/m3/day)usingalaboratorybenchscaletestandactivatedsludgefromadomesticwastewatertreatmentplant.1.2ThistestmethodisderivedfromaproceduredevelopedforsurfactantsbytheSoapandDetergentAssociation(1,2),onedevelopedforalkylbenzenesulfonatesbyASTM(seeTestMethodD2667)andonedevelopedbytheOrganizationforEconomicCooperationandDevelopment(OECD)forassessinginherentbiodegradation(3)andalsocodifiedintheToxicSubstancesControlActTestGuidelines(4).Forassessmentofvariability,replicatetestsystems(threeormore)shouldbeemployed.Itisrecommendedthatthetestsbeusedforchemicalcompoundsthatcanbewellcharacterizedwithrespecttochemicalandphysicalproperties.Testingofmixturesorfullyformulatedproductscanleadtoseriousproblemsindatainterpretations.1.3Theproceduresinvolvetheexposureofthetestchemical(s)toactivatedsludgemixedliquormicroorganismsoverafinitetimecycleinspeciallydesignedaerationchambers.Biodegradabilityisdeterminedfromdissolvedorganiccarbon(DOC)measurements,fromradiochemicalanalyses,orfrommeasurementsoftestchemicalconcentrationusingaspecificanalyticalmethod.BasedonDOCanalysesalone,biodegradationcanonlybeclaimedifotherremovalmechanisms(forexample,adsorption,volatility,orchemicaltransformation)arediscountedbymeansofspecifictestingorknowledgeofphysicalchemicalpropertiesofthetestchemical.Modificationsofthistestmethodforwaterinsolubleandmoderatelyvolatilechemicalsarepresentedinthistestmethodandprinciplesaredescribedinsomewhatmoredetailelsewhere(see5,6).1.4Theseproceduresmayalsobeusedasameansofacclimatingmicroorganismstoanorganicchemicaloveranextendedperiod.Theacclimatedmicroorganismsmaybeusedasaninoculumsourceforotherbiodegradationtests.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ForspecifichazardstatementsseeSection7andinNote1.
【中国标准分类号】:Z12
【国际标准分类号】:13_060_70
【页数】:7P.;A4
【正文语种】:英语