CAST污水处理工艺的应用研究

X703.110005G200405005CASTRESEARCHONAPPLICATIONOFCYCLICACTIVATEDSLUDGETECHNOLOGYPROCESSINSEWAGETREATMENT20074100I5000m3/dCAST1.SBRCASTCAST2.CAST3.CAST4.5.ATV-A131ECYtOVc6.CASTCASTSS10mg/LCASTSBRCASTIIAbstractIIIAbstractIntheperiodofthe11thFive-YearPlan,Chinawillvigorouslyconstructurbansewagetreatmentplants,particularlysmallandmediumones,soastoincreasethenewurbansewagetreatmentcapacityto50millionm³/d.ForthisreasonitisnecessarytoresearchandreviewtheCAST,whichhasagoodeffectofnitrogenandphosphorusremoval,lowcostsofinvestmentandrunning,smallgroundcoverage,relativelysimplemanagementandwidelyapplications,sothatwecanidentifytheexistingproblemsinitsdesignandoperation,andfindoutanimprovementplantofacilitatethefurtherpromotion.Thispaperiswrittenbasedontheaboveideas,myexperienceindesignandoperatingandotherrelatedfindings.1.ItbrieflyintroducestheSBRtechnology-itsfeaturesandimprovementprocess.AndithighlightstheCASTtechnologyanditsevolution;outlinesitsbasicprinciplesandkeyissues;summarizesitscharacteristics,advantages,applicationscopeandcurrentstatusathomeandabroad,etc.2.ItliststheproblemsintheapplicationofCAST,andputforwardvariousimprovementmeasuresbasedonexperienceandlessonsofitsdesign,constructionandoperation.3.ItalsodwellsatlengthonthecurrentdomesticCASTmaindesignandcalculationmethods,andgivesdetailedanalysisanddemonstration,showstherespectivecharacteristicsandusefulcontentsandtheexistingproblemsofthesemethods.Onthisbasis,thispaperpresentsandrecommendsapracticaldesignandcalculationmethod.4.Itconcludesindetailthesteps,elements,specificmethodsandcontentoftherecommendeddesignandcalculationmethod.Andtofacilitatethedirectuseindesign,itpresentsvariousforms,whicheliminatethecumbersomecalculatingprocess.5.ItalsoderivesanddemonstratestheCYtOVcformulascitedinATV-A131Estandards,identifiesitsorigin,thusmakingitagenerallyacceptedtheoreticalbasisandacommonstandard.6.Inthecomparisonoftherecommendedmethodandothermethods,itlistsIVvariousadvantagesoftherecommendedmethod.ItparticularlydescribesthattherecommendedmethodderivessludgeloadonthebasisoftheneededSRTofnitrificationanddenitrificationandthecorrespondingtotalsludgeyieldcoefficients,whichhastheoreticalbasisandrecognizedcommonstandards,inthiswaytherecommendedmethodovercomesthesubjectivearbitraryofotheralternatives.Inthecomparisonwiththesettlementfactorsmethod,thepaperpointsoutthatinmanyareasofCAST,the“recommendedmethod”exaggeratesdifficultiesinthesettlementprocess;anditrepeatedlydemonstratestheadvantageoftheCASTreactiontankinmeetingthesolid-liquidseparationrequirement,anditssettlementfunctionisnotarestrictioninthedesignandcalculationmethod.Therecommendedmethodalsoprovestohaveexcellenteffectinanumberofpracticalengineeringapplications.Itisnoteworthythatalltheout-comingwater’sSSis10mg/L,whichprovesthatCASTreactiontankdesignedbasedontherecommendedmethodcanprimelyperformthesolid-liquidseparationfunction.Keywords:SBRtechnology;CAST;Activatedsludgemethod;Nitrogenandphosphorusremoval;DesignandcalculationMethodI...................................................................................................................................IABSTRACT.........................................................................................................................III1..........................................................................................................................11.1.....................................................................................................................11.2SBR..........................................................................................................21.3CAST....................................................................51.3.1CAST.............................................................................51.3.2CAST.........................................................81.4CAST..................................................................111.5CAST..........................................................................................121.5.1.....................................................................................121.5.2.....................................................................................141.6................................................................................................162CAST.................................................-17-2.1........................................................................................-17-2.1.1......................................................-17-2.1.2......................................................................................-17-2.1.3..................................................................................-18-2.1.4BOD5........................................................................................-19-2.1.5......................................................................................-19-2.1.6SVI........................................................-20-2.1.7.......................................