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28420097ENVIRONMENTALCHEMISTRYVo.l28,No.4July20092008109.*(50678073);(BS2007125);(BK2007022)**,Emai:lxfl@ijiangnaneducnMBR*张丽娜1,2李靖梅1,2李秀芬1,2**陈坚3堵国成2,4(1;2;3;4,,214122)(MBR),(EPS).,EPS,35d,(SVI).EPS,EPSEPS,EPS.,,.(EPS),,,EPS(BEPS)EPS(SEPS)[1],.EPS,.(MBR),EPS,,EPS.MBR,,(SVI),EPS,EPS,MBREPS[2].111.,02m,065mm,10mm,2m2.,030m050m070m,80L,.12,,pH.130,COD270mgl-1,3148,COD390mgl-1.NH+4N3540mgl-1.,GB8978199613,MLVSS/MLSS032,2,3gl-1,22h,15d,pH7080,.COD,pH,EPS.54028,8000rmin-110min,.,8030min,12000rmin-115min,,EPS[35].COD,MLVSS,MLSS,SVIpH.,.,EPS.EPS.221EPSEPS,,,EPS.EPS,,EPS.1,35,EPS,EPS,,25012736mgg-1VSS.,30dCOD390mgl-1,,.MBREPS,EPS,.2MBREPS.EPS,EPS,35dEPS,EPS5585,39981587mgg-1VSS,0397.EPS,2335,EPS2720.1MBREPSEPSFig1ComponentsandcontentofEPSinsupernatantofMBR2MBREPSEPSFig2ComponentsandcontentofEPSinsludgeofMBR223MBR,.MBR,,,,30d0086mgCODmg-1VSSd-1.35,,,290119350309mgCODmg-1VSSd-1.EPS.SVI50200mlg-1MLSS[6].4,MBR29d,SVI,1100mlg-1MLSS,2540mlg-1MLSS,50mlg-1MLSS,,,.35,SVI80100mlg-1MLSS.,SVIEPS.4:MBR5413MBRFig3SpecificsubstratedegradedrateofsludgeasafunctionoftimeinMBR4MBRSVIFig4SVIasafunctionoftimeinMBREPS,MBR.EPS,EPS(29173mgg-1VSS35558mgg-1VSS),EPS,,[7].,EPS,SVI.,Liao[8]EPS,EPS,,EPS[5].,EPS.Urbain[9],EPS(SVI).EPS,,.,pH7075,EPS,,,[10].17,2329,EPS,166,174173mgg-1VSS,/0051,00920096,SVI72,4340mlg-1MLSS./,SVI,,SVI/.35dEPS,37,4244.EPS/SVI,EPSSVI,2935,EPS,EPS173558mgg-1VSS,/00960397,SVI40mlg-1MLSS806mlg-1MLSS,,EPSSVI.EPS,EPS,35789%EPS,29640%,,EPS,EPS,Wang[11].EPSEPS.3MBR,35,EPS,,EPSSVI./,SVI,,EPSSVI.54228[1]NelsenPH,JahnA,ConceptualModelforProductionandCompositionofExopolymersinBiofilms[J]WaterScienceandTechnology,1997,36(3)1119[2]ChioJG,TheBehaviorofMembraneFoulingInitiationontheCrossFlowMembraneBioreactorSystem[J]Member.Sci.,2002,203(12)103113[3]LiuH,FangHH,ExtractionofExtracellularPolymericSubstances(EPS)ofSludges[J]JournalofBiotechnology,2002,95249256[4],,,(EPS)[J],2005,25(12)16241629[5]MorganJW,ForsterCF,EvisonL,AComparativeStudyoftheNatureofBiopolymersExtractedfromAnaerobicandActivatedSludges[J]WaterResearch,1990,24(6)743750[6],,,,2003,13(7)7982[7]BullcckCM,BichoPA,SaddlerJN,TheEffectoftheHighandLowMolecularWeightFractionsofaBleachKraftMillEffluentontheMicrobialActivityofActivatedSludgeWaterResearch,2002,130(5)10951102[8]LiaoB,AllenDG,DroppoIGetal,SurfacePropertiesofSludgeandTheirRoleinBioOcculationandSettleability[J]Wat.Res,2001,35339350[9]UrbainV,BlockJC,ManemJ,BioflocculationinActivatedSludge,anAnalyticalApproach[J]WatSciTech.,1993,25441443[10]WilenBM,JinB,LantP,RelationshipbetweenFlocculationofActivatedSludgeandCompositionofExtracellularPolymericSubstancesWaterSciTechnol,2003,4795103[11]WangZP,LiuLL,YaoJetal,EffectsofExtracellularPolymericSubstancesonAerobicGranulationinSequencingBatchReactorsChemosphere,2006,6317281735INFLUENCEOFEPSACCUMULATIONONPROPERTIESOFSLUDGEINMEMBRANEBIOREACTORZHANGLina1,2LIJingmei1,2LIXiufen1,2CHENJian3DUGuocheng2,4(1LabofEnvironmentalBiotechnology,JiangnanUniversity;2KeyLaboratoryofIndustrialBiotechnology,MinistryofEducation,JiangnanUniversity;3NationalKeyLabofFoodScienceandTechnology,JiangnanUniversity;4LabofBiologicalDesignandProcess,JiangnanUniversity,Wux,i214122,China)ABSTRACTTheinfluenceonsludgepropertiesofextracellularpolymericsubstances(EPS)accumulatedinmembranebioreactor(MBR)forsyntheticmunicipalwastewatertreatmentwasinvestigatedTheresultsshowedthatEPSturnedintoaccumulationperiodat35dofoperationafterexperiencingalowvaleAccordingly,thespecificsubstratedegradedrateofsludgeanditsvolumeindex(SVI)hadchangedTheincreasesintotalcontentofsystemEPSandtheratioofproteinstopolysaccharides,bothsludgeactivityanditssettlingabilityimprovedThiswassupportedbytheobservationthatmoreEPSwasfoundinsludge,butnotinsupernatan,tduringEPSaccumulationperiodpropertyKeywords:membranebioreactor,extracellularpolymericsubstance,sludgeproperty.