胞外聚合物对活性污泥表面性质及其絮凝性能的影响龙向宇

164　　　Vol.34　No.11　2008胞外聚合物对活性污泥表面性质及其絮凝性能的影响龙向宇1　龙腾锐1　唐　然2(1,　400045;2,　400016)　　　采用超声波法与阳离子交换树脂法提取5种污泥龄的活性污泥絮体中疏松结合的EPS(LEPS)与紧密结合的EPS(TEPS),分别考察两部分EPS的数量与表面性质对活性污泥表面性质及其絮凝性能的影响。研究结果表明,污泥的表面电荷主要受到絮体外层LEPS的影响,LEPS数量与表面负电荷的增大导致污泥表面负电荷的增加;TEPS疏水性较LEPS疏水性同污泥疏水性有更强的相关性,而其数量与污泥疏水性无关。LEPS数量与表面电荷的增加会导致出水悬浮物浓度(ESS)升高,而TEPS的数量与表面电荷同活性污泥絮凝性能没有强相关性;两种EPS疏水性的增大有利于生物絮凝,促进絮体中颗粒物的凝聚,对应着低的ESS与高的重新絮凝能力(FA)。　胞外聚合物　表面电荷　疏水性　絮凝性能0　(extracellularpolymericsub-stances,EPS),[1]。,EPS[2～5],。,,EPS[5～7]。,EPS[8],EPS,EPS。[9][10],5EPS(looselyboundEPS,LEPS)EPS(tightlyboundEPS,TEPS),EPS,,。1　3　,,,..,2001,22(5):45～494　,,,..,2005,26(1):47～505　Murray-GuldeC,HeatleyJE,KaranfilT,etal.PerformanceofaHybridReverseOsmosis-ConstructedWetlandTreatmentSystemforBrackishOilFieldProducedWater.WaterResearch,2003,37(3):705～7136　SteinmannCR,WeinhartS,MelzerA.ACombinedSystemofLagoonandConstructedWetlandforanEffectiveWastewaterTreatment.WaterResearch,2003,37(9):2035～20427　GreenM,ShaulN,BeliavskiM,etal.MinimizingLandRe-quirementandEvaporationinSmallWastewaterTreatmentSys-temsEcollEng,2006,26(3):266～2718　,,,..,2006,27(2):241～2459　,,,..,2007,23(15):86～8910　,,,.-.,2007,26(6):815～81811　,,,..,2006,26(1):62～6612　,,,..,2006,32(1):18～22　　&:13561770996E-mail:[e-mail]:2008-05-15:2008-08-12DOI:10.13789/j.cnki.wwe1964.2008.11.013　Vol.34　No.11　2008165　　1.1　SBR。,515LSBR。,3d、6d、10d、15d20d。,。,:DO1～6mg/L;pH7～7.6;MLSS2000～2200mg/L;(25±1)℃[9,10]。1.2　EPSSBR,,[9][10]LEPSTEPS。5mLXAD-8,[11,12]。LEPSTEPSpH2,,12h,6000r/min(4200g)30min,80mLXAD-860mL/h。,EPS;XAD-8EPS[12]。EPS1。,4℃。1　EPS1.3　[13],,Cat-Floc,PVSK。EPSmeq/gEPSmeq/gVSS。1.4　EPSEPSEPS。[3],。1.5　(ESS)[5](FA)[3]。[9,10]。2　2.1　EPS2.1.1　EPS[8],EPS:TEPS,LEPS;,LEPS。2,TEPS,80mg/gVSS;LEPSEPS。,SRT15dLEPS,25.6mg/gVSS;SRT20d,LEPSSRT15d。52　EPS,LEPSTEPS(3):,EPS(3a),LEPSTEPS;SRT15d,LEPSTEPS,-0.77meq/gEPS-1.01meq/gEPS。(3b),TEPSLEPS166　　　Vol.34　No.11　2008;,TEPSSRT。3　EPS2.1.2　[3],。4。4　4,SRT,,SRT3d24.6%SRT20d38.3%。EPS,、、。4,SRT;SRT15d,-0.030meq/gVSS,EPS1～2,。2.2　EPS2.2.1　EPSLEPS(1),0.754-0.536,LEPS。TEPS,。LEPS,TEPS。1　EPS(r)acLEPS0.754b-0.536bTEPS-0.301　:a25;b95%;c;。2.2.2　EPS2,LEPSTEPS,0.7580.483;,。2　EPS(r)acLEPSc0.758bTEPSc0.483b　　3,LEPSTEPS,0.4100.692。,TEPS(23b),,TEPS。3　EPS(r)aLEPS0.410bTEPS0.692b2.3　EPS2.3.1　ESSFA　Vol.34　No.11　2008167　　,[4,5,12]ESS,ESS;[3]FA,FA。5,SBRESS6～50mg/L,FA15%～45%,FAESS;SRT15d,,ESSFA8.9mg/L33.1%。5　ESSFA,ESSFA(6)。ESS,;FA,。EPS,ESSFA。6　ESSFA2.3.2　EPS4,LEPSESSFA,(SRT3d6d)LEPS(1),ESSFA;(SRT15d20d)LEPS,。:①LEPS、,[3],;②LEPS,,,LEPS。TEPSESSFA,ESSFA。TEPSLEPS,TEPS。4　EPSESSFA(r)aESSFALEPS0.637b-0.441bTEPS-0.3470.2422.3.3　EPS5,LEPSESS,0.565。,,,、,。TEPS,ESS。EPSFA,EPS,[3,6,8]。,EPSESSFA(5),EPSESSFA。,[12];,,[14]。5　EPSESSFAaESSFALEPSc0.565b-0.386TEPSc0.325-0.167LEPS-0.608b0.520bTEPS-0.594b0.462b　　,LEPSESS,TEPS;EPS,。2.4　168　　　Vol.34　No.11　2008ESS(6),。;,,ESS。FA,、,。6　ESSFAaESSFAc0.752b-0.337-0.3580.441b3　EPSEPS,EPS,,:(1)TEPS,LEPS,(15d20d),LEPSTEPS。(2)LEPS,LEPS;TEPSLEPS,。(3)LEPSESS,TEPS;EPS,,ESSFA。参考文献1　UrbainV,BlockJC,ManemJ.Bioflocculationinactivatedsludge:ananalyticapproach.WaterRes,1993,27,829～8382　KeidingK,NielsenPH.Desorptionoforganicmacromoleculesfromactivatedsludge:effectofioniccomposition.WaterRe-source,1997(31):1665～16723　WilénBM,JinB,LantP.Theinfluenceofkeychemicallcon-stituentsinactiveatedsludgeonsurfaceandflocculateingprop-erties.WaterRes,2003,(37),2127～21394　Higgins,Novak.Characterizationofexocellularproteinanditsroleinbioflocculation.JournalofEnvironmentalEngineering,1997,123,479～4855　LiaoBQ,AllenDG,DroppoIG,etal.Surfaceproperotiesofsludgeandtheirroleinbioflocculationandsettleability.WaterRes,2001,35,339～3506　MorganJW,ForsterCF,EvisonL.Acomparativestudyofthenatureofbiopolymersextractedfromanaerobicandactivatedsludges.WaterRes,1990,24,743～7507　MikkelsenLH,KeidingK.Physico-chemicalcharacteristicsoffullscalesewagesludgeswithimplicationtodewatering.WaterRes,2001,36,2451～24618　DominguesBA.Composition,fate,andtransformationofex-tracellularpolymersinwastewaterandsludgetreatmentproces-ses.PHDdissertation.UAS,20029　,,,.—.,2008,34(5):34～3810　,,,..,2008,24(3),31～3611　ImaiA,FukushimaT,MatsushigeK.Fractionationandchar-acterizationofdissolvedorganicmatterinashalloweutrophiclake,itsinflowingrivers,andotherorganicmattersources.WaterRes,2001,35,4019～402812　JorandF,Boué-BigneF,BlockJC.etal.Hydrophobic/hydro-philicpropertiesofactivatedsludgeexopolymericsubatances.WatSciTech,1998,37,307～31513　MikkelsenLH.Applicationandlimitationsofthecolloidtitra-tionmethodformeasureingactiveatedsludgesurfacecharges.WaterRes,2003(37):2458～246614　LiaoBQ,AllenDG,LeppardGG,etal.Interparticleinterac-tionaffectingthestabilityofsludgeflocs.JournalofColloidandInterfaceScience,2002,249:372～380　　&:400045B11322:[phone]E-mail:[e-mail]:2008-03-28:2008-08-12