pH调节对活性污泥混合液膜过滤性的影响

25120061ENVIRONMENTALCHEMISTRYVo.l25,No.1January20062005627.*,Emai:[e-mail]庄芫吴金玲黄霞*(,,,100084)NaOHpH,.,pH,.(EPS),(SVI),(TOC).SVI.,EPS,.LBEPS,,,.,,,pH.pH[1],NaOH(EPS),.,pH,,,,.,NaOHpH711,,(SVI)Zeta,pH.111.35L,,,04m,0033m2,NaOHpH,,.,36Lm-2h-1.(04m3h-1),.20min,(TMP),.K(m-1min-1)20minR20(m-1),.,,.12(FormaldehydeNaOHProcess)EPS[2],TOC,TOCSHIMADZUTOCAnalyzer5000A.100ml100ml,30min,(SV).(SVI)=SV/MLSS.1,TOC1.10ml1ml250mgl-1Al2(SO4)3,,2,TOC2.2TOCTOC,12TOC[3].5625,BrookheavenZetaplusZeta.13,1.1Table1IndexofactivatedsludgepH67SVI150170SS/gl-14555EPS/mgTOCg-1VSS120130VSS/gl-134/mgTOCl-13337K(1010)/m-1min-11317/mgTOCl-156R20(1012)/m-14570Zeta/mV-1311221pHNaOHpH,,1.,K1pHFig1EffectofpHonmembranefilterabilityofmixedliquorR20pH,pH89,K35%45%,R2020%30%.KR20,.NaOHpH(pH89),,.22pH221pH,,EPS2.pH,EPS.,EPS.pH,EPS,EPS.222pH,SVI3.31,SVIpHpH,pHSVI.pH,SVI,pH,,,SVI.2pHFig2EffectofpHonEPSofactivatedsludge3pHSVIFig3EffectofpHonsludgevolumeindex1:pH57223pH,TOC()4.pH,TOC.2,EPS,TOC.pH,,,EPS.224ZetapHZeta5.pH7,Zeta;pH7,pH,Zeta,pH10.4pHFig4EffectofpHonsupernatantorganicsubstances5pHZetaFig5EffectofpHonZetapotential234,NaOH.EPS,.,NaOHpH89,11,,,2.2NaOHTable2ChangeofmembranefilterabilityandsupernatantTOCinNaOHtreatedsludgemixedwithuntreatedsludgepH=8pH=91111K(1010)/m-1min-199096210721058R20(1012)/m-1375363396387TOC/mgl-158125037711063392,NaOH,,KR20.,.,,EPS.TOC,,.24().[4,5].,EPS,,EPS[68].EPS,EPS(TBEPS),,;TBEPS(LBEPS),[9].LBEPS5825,,[10],,,,,[11].TBEPS,EPS,[7,11].,EPS,[12].,pH,EPS,,LBEPS.ZetapH7,NaOH.pH,Zeta,LBEPS,LBEPS,.LBEPS,,TBEPS,,SVI.SVI,,,..,TOC.SVI,.,LBEPS,,pH9,.3(1),pH89,.(2)EPS,SVI,TOC.SVI.(3),EPS,.(4)EPS,LBEP,,,.[1]DilekCetinF,GulermanSurucu,EffectsofTemperatureandpHonthePhysicalPropertiesofActivatedSludgeFlocs[J].EnvironmentalStudies,1989,34189199[2]LiuH,FangH,ExtractionofExtracellularPolymericSubstances(EPS)ofSludges[J].JournalofBiotechnology,2002,95249256[3]BouhabilaEH,AimRB,BuissonH,FoulingCharacterisationinMembraneBioreactors[J].SeparationandPurificationTechnology,2001,2223123132[4],,,[J].,2002,3(1)17[5]DefranceL,JaffrinMY,GuptaBeta.l,ContributionofVariousConstituentsofActivatedSludgetoMembraneBioreactorFouling[J].BioresourseTechnology,2000,73105112[6]FlemmingHC,WingenderJ,RelevanceofMicrobialExtracellularPolymericSubstances(EPSs).PartII.TechnicalAspects[J].WaterSci.Technol.,2001,43(6)916[7]JorandF,BoueBigne,BlockJCeta.l,Hydrophobic/HydrophilicPropertiesofActivatedSludgeExopolymericSubstances[J].WaterSci.Technol.,1998,37(4)307315[8]WilenBM,JinB,LantP,TheInfluenceofKeyChemicalConstituentsinActivatedSludgeonSurfaceandFlocculatingProperties[J].WaterResearch,2003,372127139[9]WingenderJ,NewTR,FlemmingHC,MicrobialExtracellularPlymericSubstances:Characterization,StructureandFunction[M].Berlin:Springer,1999[10]JinB,WilenBM,LantP,AComprehensiveInsightintoFlocCharacteristicsandTheirImpactonCompressibilityandSettleabilityofAtivatedSludge[J].ChemicalEngineeringJournal,2003,9522134[11],,,[J].,2003,13(9)3134[12]NeyensE,BaeyensJ,DewilReta.lAdvancedSludgeTreatmentAffectsExtracellularPolymericSubstancestoImproveActivatedSludgeDewatering[J].JournalofHazardousMaterials,2004,106B83921:pH59EFFECTOFADJUSTINGpHONMEMBRANEFILTERABILITYOFACTIVATEDSLUDGEMIXEDLIQUORZHUANGYuanWUJinlingHUANGXia(EnvironmentalSimulationandPollutionControlStateKeyJointLaboratory,DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing,100084,China)ABSTRACTTheeffectofadjustingpHbyNaOHonmembranefilterabilityofactivatedsludgemixedliquorwasstudiedinthisresearch.Ananalysisofthepropertiesofthemixedliquorwasconductedtoinvestigatethemechanisms.TheresultsindicatedthatmoderatelyadjustingpHwaseffectivetoimprovethemembranefilterabilityofmixedliquor.TreatedbyNaOH,extracellularpolymericsubstances(EPS)onmicrobialcellswasreleased,sludgevolumeindex(SVI)wasreducedwhilethesupernatantTOCwasincreased.TheimprovementofmembranefilterabilitywascloselyrelatedtothedecreaseofSVI.EPSreleasedfromthesurfaceofmicrobialcellsatalkalineconditioncouldenhancetheflocculatingabilityofactivatedsludgeflocstosomeextent,buttheeffectwaslimited.ItwaspresumedthattreatmentwithNaOHcouldextractedLBEPSfromthesurfaceofcellssoastoincreasethehydrophobicpropertyofcells,whichwasfavorabletoflocculationamongsludgeflocsandhencethemembranefilterabilityofmixedliquor.Keywords:membranebioreactor,activatedsludgemixedliquor,membranefilterability,pH.200611,,().,,,.,;.,,(hjhx@rceesaccn)...