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*龙向宇,龙腾锐,唐然(重庆大学三峡库区生态环境教育部重点实验室,重庆400045) :LEPSTEPS,EPS。:1)LEPSTEPS,LEPS;TEPS,80mg/gVSS。2)LEPS,SVIZSV;、SVI,0.803、-0.761-0.689。3)TEPSSVIZSV;TEPSSVIZSV,SVIZSV。 :;;; :X703 :A :(K)08088(1002-1264)(2008)03-0015-06InfluenceofExtracellularPolymersandTheirSurfaceCharactersonSettleablityofActivatedSludgeLONGXiang-yu,LONGTeng-rui,TANGRan(KeyLabofThreeGorgesReservoirRegion’sEco-EnvironmentofMinistryofEducation,ChongqingUniversity,Chongqing400045,China)Abstract:LooselyboundEPS(LEPS)andtightlyboundEPS(TEPS)wereextractedbyultrasonicandcationresininturn,andtheinfluenceoftwotypeEPSandtheirsurfacecharacterstothesettleabilityofactivatedsludgewereinvestigated.Theresultsshowed:SRThaddifferentinfluenceonthetotalamountoftwotypeEPS.WiththeincreaseofSRT,thetotalamountofLEPSincreasedearlyanddecreasedlate,whilethetotalamountofTEPSwasalmoststeadywiththeaverageabout80mg/gVSS.WhilethetotalamountofLEPSincreasedortheirsurfacechargeandhydrophobicitydropped,SVIwouldbeenhancedandZSVwouldbereduced.ThetotalamountofTEPSwasnotsignificantlyrelatedtoSVIandZSV,whilehydrophobicityofTEPShadstrongeffectsonSVIandZSV.Thatistosay,higherhydrophobicityofTEPSwascorrespondedtolowerSVIandhigherZSV.Keywords:extracellularpolymer;surfacecharge;hydrophobicity;settleability ,。(extracellularpolymers,EPS),、[1-6]。,EPS,EPS[2-7],。,3:,EPS;,EPS;,EPS,EPS。 [8][9],EPS(looselyboundEPS,LEPS)EPS(tightlyboundEPS,TEPS),EPS,。1 1.1 SBR15 21320086URBANENVIRONMENTURBANECOLOGYVol.21No.3Jun.2008*:(2004BA604A01) :2008-04-06。,515LSBR,,3d,6d,10d,15d20d,MLSS2000～2200mg/L。ρ(COD):ρ(N):ρ(P)100:5:1,、;,。:DO1.0～6.0mg/L,pH7.0～7.6,25±1℃。1.2 EPS SBR,,3000r/min(1800g)20min,,pH(pH7.0)1/3(3),。60mL,21kHz、40W2min[8]。6000r/min(4200g)30min,0.22μm,LEPS。pH,60mL。EPS;,80mg/gVSS,550r/min,1.5h[9]。,,250μm。6000r/min30min,0.22μm,TEPS。,4℃。EPS1。1 EPS 5mLXAD-8,0.1mol/LHClNaOH3[10,11]。HClLEPSTEPSpH2,23,12h,6000r/min(4200g)30min,80mLXAD-860mL/h。,EPS;XAD-8EPS[11]。1.3 EPS EPSEPSEPS。[12],,Cat-Floc,PVSK,,pH。[12],meq/gEPS。1.4 (SVI)(ZSV)。SVI500mL;ZSV2000mL,m/h。1.5 EPS—,;Folin,;DNA,2--D。、、DNAEPS。VSS:100mL3000r/min20min,105℃,600℃。。2 2.1 SVIZSV ,,ZSVSVI。2,5SBRSVI40～105;SRT15d,SVI,43.2。ZSV;SRT20d,ZSV,10.0m/h。,16 213 2008,。2 ZSVSVI(rp=-0.588,P0.05) ,(),(SRT3d6d);(SRT15d20d)。,。2.2 LEPS (TEPS)(LEPS)。,、LEPS[8];,,,TEPS[9](1)。2.2.1 LEPS 3,SRT15d,LEPS,25.6mg/gVSS;、LEPS。DNA,3.6mg/gVSS,LEPS8%。3 LEPS LEPS,(4);SRT15d,,28.1%-0.77meq/gEPS。LEPS(5),0.672(P0.05)。LEPS,、[4];LEPS,,。,LEPS。4 LEPS5 LEPS(rp=0.672,P0.05) 6,,20%;,,17%30%;SRT10d,,31%35%。6 LEPS ,、、、、,、,[4];20%,LEPS,,。、、、[14];LEPS,。、3,;,,17 , 。LEPS。,LEPS,。2.2.2 LEPS LEPS1。1 LEPSSVIZSV(r)aSVIZSVb0.759b-0.449b0.722b-0.559b0.548b-0.296LEPS0.803b-0.631b:a25;b95%。 1,ZSV(P0.05),LEPSSVIZSV。LEPS、,SVIZSV,LEPSSVIZSV。LEPSSVIZSV0.803-0.631。LEPS2,LEPSSVIZSV(P0.05)。LEPSSVI,-0.761-0.689;ZSV,0.5760.497。,LEPS、SVI;ZSV。2 LEPSSVIZSV(r)aSVIZSVLEPS-0.761b0.576bLEPS-0.689b0.497b:1 5SRT,LEPS35%(45),LEPS。,LEPS。LEPSLEPS:LEPS,;LEPS,。LEPS,LEPS,,SVI。,LEPSSVI。LEPS,,;,LEPSSVI。,LEPS,,,ZSV。LEPSZSV,LEPSZSV,[5,6]。2.3 TEPS2.3.1 TEPS 6,TEPS,80mg/gVSS。TEPS:3d47.7mg/gVSS20d35.1mg/gVSS;,3d16.611.3mg/gVSS20d27.119.2mg/gVSS。 7,TEPS,3d21.7%20d43.4%,SRTLEPS;TEPS,3d-1.26meq/gEPS15d-1.02meq/gEPS。SRT6d、10d、15d20d(37),TEPSLEPS。,EPS,TEPS,TEPSNa+,LEPS。7 TEPS TEPS(rp=0.505,P0.05),8。SRT20dTEPS,8;,TEPS,0.729(P0.05)。9,TEPS318 213 2008,,24%;,SRT20d,50.6%53.7%。8 TEPS9 TEPS(rp=0.505,P0.05)2.3.2 TEPS TEPS3。,TEPSSVIZSV(P0.05),TEPSSVIZSV。ZSV,TEPSSVIZSV,LEPSTEPSSVIZSV。3 TEPSSVIZSV(r)aSVIZSV-0.2970.728b0.598b-0.359-0.523b0.459bLEPS-0.1090.088:1。 TEPS4。4,TEPSSVIZSV(P0.05);TEPSSVI,-0.7680.637。TEPSLEPS(10),TEPS,,。,TEPS,,,SVIZSV;TEPSSVIZSV,EPSSVIZSV。10 TEPS4 TEPSSVIZSV(r)aSVIZSVTEPS0.365-0.107TEPS-0.768b0.637b:1。3 LEPSTEPS,EPS。,: 1)LEPSTEPS。SRT15d,LEPS,25.6mg/gVSS;TEPS,80mg/gVSS。 2)LEPSTEPS,SRT,TEPSLEPS。 3)LEPS,LEPS,SVIZSV。 4)TEPSSVIZSV;TEPSSVIZSV,SVIZSV。[1] BoJin,Britt-MarieWilén,PaulLant.ImpactsofMorphological,PhysicalandChemicalPropertiesofSludgeFlocsonDewaterbilityofActivatedSludge[J].ChemicalEngineeringJournal,2004,98(1):115-126.[2] Urbain,V.,Block,J.C.,Manem,J.BioflocculationinActivatedSludge:AnAnalyticApproach[J].WaterResearch,1993,27(5):829-838.[3] LiaoB,Q,AllenDG,Droppo,I.G.etal.SurfacePropertiesof19 , SludgeandTheirRoleinBioflocculationandSettleability[J].WaterRes,2001,35(2):339-350.[4] Benetti,AntonioDomingues.Composition,FateandTransformationofExtracellularPolymersinWastewaterandSludgeTreatmentProcesses[M].USA:PHDDissertation,2002:4-32.[5] Britt-MarieWilén,BoJin,PaulLant.TheInfluenceofKeyChem-icalConstituentsinActiveatedSludgeonSurfaceandflocculatingproperties[J].WaterReseach,2003,37(9):2127-2139.[6] BoJin,Britt-MarieWilén,PaulLant.AComprehensiveInsightintoFlocCharacteristicsandTheirImpactonCompressibilityandSettleabilityofActiveatedSludge[J].ChemicalEngineeringJour-nal,2003,95(1):221-234.[7] Beccari,M.,Mappelli,P.,Stuckey,D.C.AReviewofSolubleMicrobialProduct(SMP)inWasterwaterTreatmentSystems[J].WaterResearch,1999,33(14):3063-3082.[8] ,,,.—[J].,2008,27(5)