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1、BioproccssBiosystEng25(2002)103-109DOI10.1007s00449002-0286-9AerobictreatmentofdairywastewaterwithsequencingbatchreactorsystemsXiujinLi,RuihongZhangAbstractPerformancesofsingle-stageandtwo-stagesequencingbatchreactor(SBR)systemswereinvestigatedfortreatingdairyWaSteWater.Asingle-stageSBRsystemwastest

2、edwith10,000mg/1chemicaloxygendemand(COD)influentatthreehydraulicretentiontimes(HRTs)of1,2,and3daysand20,000mg/1CODinfluentatfourHRTsof1,2,3,and4days.A1-dayHRTwasfoundsufficientfortreating10,000-mg/1CODwastewater,withtheremovalefficiencyof80.2%COD,63.4%totalsolids,66.2%volatilesolids,75%totalKjeldah

3、lnitrogen,and38.3%totalnitrogenfromtheliquideffluent.Two-dayHRTwasbelievedsufficientfortreating20,000-mg/1CODdairywastewaterifcompleteammoniaoxidationisnotdesired.However,4-dayHRTneedstobeusedforachievingcompleteammoniaoxidation.Atwo-stagesystemconsistingofanSBRandacomplete-mixbiofilmreactorwascapab

4、leofachievingcompleteammoniaoxidationandcomparablecarbon,solids,andnitrogenremovalwhileusingatleast1/3lessHRTascomparedtothesingleSBRsystem.KeywordsAerobic,dairy,wastewater,sequencingbatchreactorIntroductionDairywastewateriscurrentlydisposedofmainlythroughlandapplicationwithlittleornopretreatmentinC

5、aliforniaintheUnitedStates.Duetoincreasingawarenessofthegeneralpublicaboutpotentialadverseimpactofanimalwastesonenvironmentalqualityandrecentdevelop-Received:2October2001/Accepted：6February2002Publishedonline：5April2002Springer-Verlag2002XLi()DepartmentofEnvironmentalEngineering,BeijingUniversityofC

6、hemicalTechnology,I00029fBeijing,ChinaE-mail：bdujinTelu+86-010-64427356Fax：+86-010-644%781R.ZhangBiologicalandAgriculturalEngineeringDepartment,UniversityofCaliforniaatDavis,CA95616,USAThisresearchwassupportedinpartbytheCaliforniaEnerg),CommissionandtheAgriculturalExperimentStationoftheUniversityofC

7、alifornia,Davis,USA.10：mentsinenvironmentalregulationsforgaseous-emissioncontrolandnutrientmanagement,alternativewastewatertreatmentmethodsbecomeattractiveoptionsfordairyproducers.Asequencingbatchreactor(SBR)isabiologicaltreatmentreactorthatusesaerobicbacteriatodegradeorganiccarbonandremovenitrogenp

8、resentinthewastewater.Ifdesignedandoperatedproperly,itmaybecomeapromisingalternativefortreatinganimalwastewatertocontrolOdorSandreducesolidsandnutrientcontents.TheSBRtreatswastewaterinsmallbatchesandfitswellwithmostanimalwastewatercollectionsystems.Itisatime-orientedsystemandoperatesoverrepeatedcycl

9、esoffivephases-fill,react,settle,decant,andidle.ThemajorfactorsthatcontroltheperformanceofSBRsincludeorganicloadingrate,hydraulicretentiontime(HRT),solidsretentiontime(SRT),dissolvedoxygen(DO),andinfluentcharacteristicssuchaschemicaloxygendemand(COD),solidscontent,andcarbon-to-nitrogenratio(CN),etc.

10、DependingonhowtheseparametersarecontroDed,theSBRcanbedesignedtohaveoneormoreofthesefunctions:carbonoxidation,nitrification,anddenitrification1,2.Carbonoxidationanddenitrificationarecarriedoutbyheterotrophicbacteriaandnitrificationisbyautotrophicbacteria.TheSBRhasbeensuccessfullyusedinthetreatmentofm

11、unicipalandindustrialwastewater,wherethehightreatmentperformanceresultedinexcellenteffluentquality3,4.Itisconsideredtobeasuitablesystemforwastewatertreatmentapplicationsinsmallcommunities5.TheSBRisarelativelynewtechnologyforagriculturalapplications.PreviousresearchontheSBRforanimalwasteWaSprimarilyc

12、oncentratedonswinewastewatertreatment.Severalresearchers6,7,8reportedtheperformanceofSBRintreatingswinewastewaterwithCODandsuspendedsolids(SS)intherangeof1,614-2,826mg/1and175-3,824mg/1,respectively.SatisfactoryremovalofCODandSSfromthewastewaterwasachievedwithHRTsof22-30h.Fernadesetal.9studiedtheSBR

13、fortreatinghighlyconcentratedswinemanurewithabout4%totalsolids(TS).TheinfluentCOD,NH3-N,andtotalKjeldahlnitrogen(TKN)wereashighas31,175mg/1,1,265mg/1,and2,580mg/1,respectively.Theirresultsindicatedthatabove97%COD,99%NH3-N,and93%TKNremovalefficiencieswereachievedintheliquideffluentatHRTsof6and9daysan

14、dSRTofover20days.Tametal.10researchedSBRfortreatmentofwastewaterfromamilkingcenterandreportedthatthewastewaterwith919-1,330mg/1CODand15-37mg/1NH3-NcouldbesuccessfullytreatedwithaHRTof20h.StudiesontheSBRfortreatingdairymanurearcnotwelldocumentedintheliterature.PreviousresearchfindingsabouttheSBRfortr

15、eatmentofswinemanureandothertypesofwastewaterprovidevaluablereferencesforthetreatmentofdairywastewater.However,duetothedifferencesinthecharacteristicsofdairywastewaterfromothertypesofwastewater,researchisneededtodevelopdesignandoperationalguidelinesfortheSBRintreatingdairywastewaterofvariouscharacte

16、ristics.TheobjectivesofthisstudyarctoinvestigatetheeffectsofwastewaterCharaCteriStics,HRT,SRT,andorganicloadingrateontheperformanceoftheSBRsystemintreatingdairywastewaterforcarbonandsolidsremovalandnitrogenconversion,anddevelopdesignandoperationalguidelinesfortheSBRsysteminsingle-andmultiple-stageconfigurations.2Materialsandmethods2.1DairymanurecollectionandpreparationDairymanurewascol