胞外聚合物对活性污泥沉降和絮凝性能的影响研究

121(12):62015030:RGC(HKU7100/99E)(EPS),(LB)(TB)LBTB,:LBEPS0.6%13.5%,,LB,;TB,,,LB,EffectofExtra2cellularPolymericSubstances(EPS)onBio2flocculationandSettlementofActivatedSludgeWangHongwu1LiXiaoyan2ZhaoQingxiang1(1DepartmentofEnvironmentEngineering,EastChinaUniversityofScience&Technology2DepartmentofCivilEngineering,TheUniversityofHongKong)Abstract:Extra2cellularpolymericsubstances(EPS),composedoflooselybound(LB)andtightlybound(TB)parts,showimportantimpactonthesettlementandbio2flocculationofsludge.TheEPSproductionandtherolesofEPS(LB)andEPS(TB)onthesettlementandbio2flocculationofactivatedsludgeinlaboratory2scalereactorswerestudiedondifferentagedsludge.Ahighersludgevolumeindex(SVI),anindicationofpoorersettlement,orahigherlevelofefflu2entturbidity,asanindexofpoorerbio2flocculation,wasassociatedwithalargeramountofLB.However,nosignificantcorrelationbetweenSVIoreffluentturbidityandthetotalamountofTBwasobserved.ResultsindicatethatitistheLB,rathertheTBthatgovernsthesettlementandbio2flocculationoftheactivatedsludge.Keywords:ActivatedsludgeExtra2cellularpolymericsubstances(EPS)Bio2flocculationSettlement1(ExtracellularPolymericSubstances,EPS),,(TightlyBoundEPS,TB)(LooselyBoundEPS,LB)EPS,,,,EPS[1],,,,,,,,,,EPS,,EPS[1]EPS,Liao[2]EPSEPS,[2]EPS,EPSTB,LB[1],LBTB,LBTB,22.120g/L,2.1g/L,K2HPO413920039ChinaSafetyScienceJournalVol.13No.9Sep.20030.25g/L,KH2PO40.18g/L(COD20000mg/L);,CODNP=10051,:CaSO42H2O,0.43mg/L;FeSO47H2O,2.49mg/L;MgSO47H2O,5.07mg/L;Na2MoO42H2O,1.26mg/L;MnSO44H2O,0.31mg/L;CuSO4,0.25mg/L;NaCl,0.25mg/L;ZnSO47H2O,0.44mg/L;CoCl26H2O,0.41mg/L2.2,61.6L,3(S),24h,0.5h,()18h,2h,1h,2.5h;3(B),,,24h,18h,6h:202.0,pH70.2,DO2.55.5mg/L2.3SVI,,10min(15r/min),30min,()2.4EPSLB[1]:25mL30mL,6000g5mm,15mL0.85%NaCl,,2min,150r/min10min,2min,8000g10min,LBTB[1]EPSLBTB,(TOC)2.5COD,MLSS,SVI[3](Turbidimeter2100N,HACHcompany)TOCTOC(ShimadzuTOC-5000A)Folin[4],33.1EPS61,180EPSLBTB11TB,,TB4080mg/gMLSSB5,10,2059.4mg/gMLSS,66.5mg/gMLSS53.5mg/gMLSS;S58.2mg/gMLSS,65.8mg/gMLSS59.7mg/gMLSS,LB:B5,10,20LB4.74mg/gMLSS,2.70mg/gMLSS2.23mg/gMLSS;S1.69mg/gMLSS,0.79mg/gMLSS0.66mg/gMLSS,BLBS3;,LBEPSTB1EPS1B1B2B3S1S2S3(L/d)0.320.160.081.001.001.00COD(mg/L)6000530058002000900500MLSS(mg/L)190014020101702080170204215021801602200150F/M(gCOD/gMLSS)0.630.260.140.630.260.14(d)5102051020EPS2[1],,TB,,,;LBTB,,(slimelayer)B,,LB,S,,BSLB,LB[1],,,LB,LB,LBEPS0.6%13.5%,EPS,,EPS23ChinaSafetyScienceJournal1320032EPS3LBSVI3.2EPS3.2.1LBLBSVI33(a),LBSVI,LB,SVI,LB0.41mg/gMLSS7.90mg/gMLSS,SVI64342LBSVIy=30.60x+62.18(r2=0.76),EPS,LB,,,,,,,,,,SVI,LB[5],Zeta,,,,LB,LB,SVI[r2=0.77,3(b)],LBSVISVI[r2=0.45,3(c)]:LB,,LB,,,SVI,3.2.2TBTBSVI44,TBSVITB,B1,5SVI150mL/gMLSS,SVITBB1SVI,200mL/gMLSS,TB,SVILB5[3(a)],TBTBEPS90%,LB10,TB,,,LB,,,,,SVI,Wiln[6],TB,,,TB4080mg/gMLSSSVI4TBSVI3.3EPS3.3.1LBLB55(a),LB,LB4.0mg/gMLSS,200,,LBLBEPS,Zeta,DLVO,,;,LB,,[5],,,,33:,Wiln(weaklybound)EPS[6]5LB5(b)LB,LB,;[5(c)],LB3.3.2TB6TB6,TB,5B1,TB,LB[5(a)],TB,LBLiao[2]4EPS,,,,,EPSEPSLBTB,:(1)EPSLBTBLBEPS0.6%13.5%TB,,LBTB,,,(2)LB,BSLB,LB(3)LBLB,TB(4),,LB,(:200310;:130;;:200237)1WingenderJ,NewTR,FlemmingH-C,editors.Micro2bialExtracellularPlymericSubstances:Characterization,StructureandFunction[M].Berlin:Springer,19992LiaoBQ,AllenDG,DroppoIG,etal.Surfacepropertiesofsludgeandtheirroleinbioflocculationandsettleability[J].Wat.Res.,2001,35(2):3393503APHA.StandardMethodsfortheExaminationofWaterandWastewater,18thed[S].AmericanPublicHealthAs2sociation,AmericanWaterWorksAssociation,WaterEnvi2ronmentalFederation,Washington,19924Daniels,L,Hanson,RS,andPhilips,JA.Chemicalanal2ysis.In:MethodsforGeneralandMolecularBacteriology[M],Gerhardt,P.,Murry,R.G.E.,Wood,W.A.,andKrieg,N.R.,AmericanSocietyforMicrobiology,Li2braryofCongressCataloging2in2PublicationData,19945BoJin,WilnB.M.,PaulLant.Acomprehensiveinsightintofloccharacteristicsandtheirimpactoncompressibilityandsettleabilityofactivatedsludge.J.Chem.Eng.,2003,95:2212346WilnB.M.,BoJin,PaulLant.Theinfluenceofkeychemicalconstituentsinactivatedsludgeonsurfaceandfloc2culatingproperties[J].WatRes.,2003,37(9):2127213943ChinaSafetyScienceJournal132003,,,196251992,1996,1997,1998,,,2003198511,4,-X150,19686,,1,15,,20,1990,,,,19629,20,2(1,1),3,2,3(12),3,40,EIISTP6,,,196310,,7,20,197011,1992,1997;,2000;,,200010200210,10,4,SCI2