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【英文标准名称】:Waterquality-Adsorptionofsubstancesonactivatedsludge-Batchtestusingspecificanalyticalmethods
【原文标准名称】:水质.活性污泥上物质的吸收.使用特定分析方法的批量检验
【标准号】:ISO18749-2004
【标准状态】:现行
【国别】:国际
【发布日期】:2004-02
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC147
【标准类型】:()
【标准水平】:()
【中文主题词】:质量;水质;测定;污泥;批量检验;定义;含量测定;污水处理厂;表面吸附;水;分析方法;水质试验;活性污泥;水常规;方法
【英文主题词】:
【摘要】:ThisInternationalStandardspecifiesascreeningtestmethodforthedeterminationofthedegreeofadsorptionofsubstancesontotheactivatedsludgeorprimarysludgeinawastewatertreatmentplant.TheconditionsdescribedinthisInternationalStandardnormallycorrespondtotheoptimumconditionsfortheadsorptiontooccuratthechosenactivated-sludgeconcentrationandwaterhardnessduringthetestperiod.Themethodappliestosubstancesforwhichananalyticalmethodwithsufficientaccuracyisavailableandwhich,undertheconditionsofthetestandatthetestconcentrationused,a)arewater-soluble;b)or,ifonlyslightlywater-soluble,allowsufficientlystablesuspensions,dispersionsoremulsionstobeprepared;c)arenotsignificantlyremovedfromthetestsolutionduringthetestbyknownabioticprocessessuchasstrippingorfoaming;d)donotdeflocculateactivatedsludge;e)arenotreadilybiodegradable(foradiscussionofbiodegradability,seeISO/TR15462).Animportantparameterthatcaninfluencethereliabilityofthetestresultsisthestabilityofthetestcompoundduringthetest.Ifnoinformationonthestabilityisavailable,itisrecommendedthatthisbecheckedbeforethetest.Ifanytransformation(e.g.duetohydrolysis)isobserved,itisrecommendedthatthedegreeofadsorptionofthetransformationproductsbedetermined,ifpossible.Sincebiodegradabilityofthetestcompoundmayalsoleadtoanincorrectassessmentofthedegreeofadsorption,itisrecommendedthatthebiodegradabilitybeinvestigatedinadvanceusingstandardbiodegradationtestswhicharepreferablybasedonoxygenconsumptionoroncarbondioxideproductionandinwhichadsorptionhasnoinfluenceonthetestresult.Ifbiodegradationcannotbeexcluded,sterilizedsludgemaybeused(seeClause7).Thereisgenerallynoneedtocarryoutadsorptiontestsonsubstanceswhicharereadilybiodegradableastheyaresufficientlyremovedbiologicallyinwastewatertreatmentplants.Substanceswhichareeasilyadsorbedonactivatedsludgeinwastewatertreatmentplantsarepreferablyremovedbyadsorbingtheminsludgedigestersanddegradingthemanaerobically.Forsuchsubstances,highadsorptionmaybeareasonforcarryingoutanaerobicbiodegradationtests.AnoverviewofstandardizedbiodegradationtestsisgiveninISO/TR15462.Thetestcompoundconcentrationsusedinthismethodareusuallyverylowandthereforenonegativeeffectsaretobeexpectedonthecapacityoftheactivatedsludgetoadsorbeventoxictestcompounds.Whenthereisanydoubt,itisrecommendedthatmicroscopicinvestigationsofthefloesandsuitabletoxicitytestssuchasthatspecifiedinISO8192becarriedout.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_70
【页数】:10P;A4
【正文语种】:英语