胞外聚合物EPS对活性污泥沉降性能的影响研究

:025322468(2004)0420613206:X523:AEPS,,(,400045):Ns(DO)EPS;EPS.:EPS,DOEPS;EPSSVI;,EPS,SVI.:EPS,NsDOEPSSVI.,.:;EPS;;DOEffectofextracellularpolymericsubstances(EPS)onsedimentationofactivatedsludgeZHOUJian,LONGTengrui,MIAOLili(FacultyofUrbanConstructionandEnvironmentEngineering,ChongqingUniversity,Chongqing400045)Abstract:Theeffectofloadingrate(Ns)anddissolvedoxygen(DO)oncomposition,contentofextracellularpolymericsubstances(EPS)andsedimentationperformanceofactivatedsludgewerestudied.ResultsshowedthatNssignificantlyaffectedEPSand,andtheeffectofDOonEPSwasnegligible.AsNsreducing,thecontentofEPSandSVIincreasedandtheyweresignificantlycorrelatedeachother.Ontheotherhand,resultsoforthogonalexperimentindicatedthatthefactorcontrollingthecontentofEPSwasNs,andthemodeofNsandDOaffectingEPSandSVIwasdeduced.Inaddition,accordingtoexperimentresults,thecausesofsludgebulkingatlowloadingratecouldbeasfollows:theEPSwasmore,moreoverapartofEPSmightbethenutrimentoffilamentousbacteriaandpromotedfilamentousbacteriaincrease.Keywords:Sedimentationperformanceofsludge;EPS;loadingrate;DO:2003209202;:2003212216:(59838300);(7279):(1964),,,[e-mail](ExtracellularPolymericSubstances),,,[1],EPS,;EPS,EPS50%90%[2],EPS80%[3],EPS.EPS.,EPS.CEPS,,.[4]EPS,EPSDNASVI,EPS;SVI;EPS,EPS,Magara[3]24420047ACTASCIENTIAECIRCUMSTANTIAEVol.24,No.4July,2004EPS,,.Forster[5]:EPS,,,ZetaSVI,ZataSVI.Chao:SVI100725,Zeta.Barber28:SVIZeta.,EPS,EPS,,.,,,;,EPS.,EPS,EPS,.1111,2,15L,,.11211211EPS4,,Ns013,1,23kg(kgd)-1,COD=200880mgL-1,BOD5=112335mgL-1,SS=103375mgL-1,MLSS=215gL-1,DO=23mgL-1,pH=7134,18;HRT90min,70min,50min,30min.SVSVIEPSCODBOD5SS.EPSDNA[6].11212DOEPS3,DO015,212412mgL-1,COD=630815mgL-1,BOD5=191312mgL-1,SS=273356mgL-1,Q=300mLmin-1MLSS=215gL-1,Ns=3kg(kgd)-1,HRT=50min,pH=7142,19.SVSVICODBOD5SS,EPSDNA[6].11213DONsEPS,22L4(23),NsDO,1,4,EPSSVI,EPSDNA[6].1Table1LeveloffactorsNsP(kg(kgd)-1DOP(mgL-1)+1310318-101501211214EPSEPS,EPS.EPS,174mgL-1EPS,,OUR0109g(kgh)-1;7h,MLSS315gL-1,pH=712818.416240,015,1,2,3,5,7h,CODEPSDNA.2211EPS2EPSSVITable2InfluenceofloadingrateonEPSandSVIP(kg(kgd)-1)SVIP(mLg-1)EPSP(mgg-1)DNAP(mgg-1)P(mgg-1)P(mgg-1)013862231421581021100317601501116110017241916210710601703158013081921100260215181155154015021470120717901803493141511551210150213901206192018040d,40d1.EPS223.12:,0131Fig.1Influenceofloadingrateonsedimentationperformance2EPSFig.2InfluenceofloadingrateoncomponentandcontentofEPS3SVIEPSFig.3CorrelatiionanalysisofSVIkg(kgd)-13kg(kgd)-1,SVI8050,1119gL-12019gL-1;EPS2314mgg-11415mgg-1,1116mgg-16192mgg-1,40%.,EPSDNA,SVI,SVIEPS,3,:SVIEPS,.,,.:.212DOEPS30d,SVI4.DOEPS35.4:,DO015mgL-1412mgL-1,SVI415164:EPS4DOFig.4InfluenceofDOonsedimentationperformance5DOEPSFig.5EffectofDOoncomponentandcontentofEPS3DOEPSSVITable3InfluenceofDOonEPSandSVIDOP(mgL-1)SVIP(mLg-1)EPSP(mgg-1)DNAP(mgg-1)P(mgg-1)P(mgg-1)0154211611116512801402105012081731100212472171911961280150216601408194110041251219142106198015311101509133110052,SVI,60,;,3:,EPS;DO,EPSDNA.213DONsEPS4.4Table4Thetableofexperimentresult,orthogonalregressioncalculatingandvarianceanalysisX0X1(Ns)X2(DO)X1X2/(mgg-1)DNAYi1(EPS)DNAYi2(EPS)Yi=Yi1+Yi2Yii=Yi1-Yi21111161983109913319140612231781013020130391700190211-1-15128210581731610651983109101001910735113310131-11-1111803190131902916010123168151102819858158016241-1-11917021451313025145910131091216024170501150175Bj=XY183156-3319013100-3186bj=BjP(42)22194-41241163-0148Qj=bjBj143174211131185F=QjP(SPf)106147151651137(=0101)X0X1(Ns)X2(DO)X1X2(SVI)Yi1(SVI)Yi2(SVI)Yi=Yi1+Yi2Yii=Yi1-Yi21111154581124211-1-14852100631-11-19296188441-1-1175771522Bj=XY532-12848-24bj=BjP(42)69-166-3Qj=bjBj204828872F=QjP(SPf)227155328(=0101):S=015(Yi1-Yi2)2,f=N(M-1)=4(2-1)=4;EPS=22194-4124X1+1163X2,X1=(NS-1175)P1125,X2=(DO-2)P118,EPS=27107-3139Ns+019DO;,SVI=69-16X1+6X2,X1=(NS-1175)P1125,X2=(DO-2)P118,SVI=84174-1218Ns+3133DO61624,:EPS=27107-3139Ns+019DO(1)SVI=84174-1218Ns+3133DO(2),(1)(2);SVIEPSNs,DO,,EPS,DO.Ns,EPS,SVI.,ABADO;,EPSSVI,.214EPS67,EPS,1h,CODEPSDNA,,,EPS,EPS;12h,CODDNA,EPS,EPS,CODDNA;2h,CODDNA,EPS,.,EPS,;EPS[7],6615%,EPS3419%,EPS,.,,,,,.,:,,EPS;,EPS,.6EPSDNAFig.6ChangecurveofpolysaccharideandDNAinEPSduringbiodegradation7EPSCODFig.7ChangecurveofdissolvableCODinEPSduringbiodegradation,,,;EPS,,;,,7164:EPS;,.,,,,.,maxKs[8],;EPS,EPS,EPSDNA(2);2,EPSDNA,EPS(6),.,,,EPS,.31)EPSSVI,SVI=4112EPS-211658;EPS,,EPS,SVI;DO,EPS,SVI.2):EPS,DO,:EPS=27107-3139Ns+019DO,SVI=84174-1218Ns+3133DO.3)EPS,,EPS,.:[1]MelanieJBrown,JNLester.Metalremovalinactivatedsludgetheroleofbacterialextracellularpolymers[J].WatRes,1979,13(1):817837[2]UrbainetalV.Bioflocculationinactivedsludge:ananalysticapproach[J].WatRes,1993,27(5):829838[3]MagaraY,NumbuS,UtosawaK.Biochemicalandphysicalpropertiesofanactivedsludgeonsettlingcharacteristics[J].WatRes.1986,10(1):7177[4]ForsterCF,DallasNewtonJ.Activedsludgeonsettlementsomesuppositionsandsuggestion[J].WatPollutControl,1980,79(3):338351[5]ForstorCF.Factorsinvolvedinthesettlementofactivatedsludge2nutrientsandsurfacepolymers[J].WaterRes,1985,19(10):12591264[6]BoFrolund.Extractionofextracel