胞外聚合物及其表面性质对活性污泥沉降性的影响龙向宇

*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)