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41820098JOURNALOFHARBININSTITUTEOFTECHNOLOGYVol141No18Aug.2009A2O1,1,2,1,1,1(1.,150090,hit-changyong@163.com;2.,100124):A2O,5215LA2O.:A2O,HRT8h,70%250%,A2O36%,,3514%.C/N,,C/NTN.1/15/8,,TN62%70%,.A2O,A2OC/N.:;;A2O;C/N:X70311:A:0367-6234(2009)08-0046-04CharacteristicsofdenitrifyingphosphorusremovalinA2OprocessWUChang2yong1,PENGYong2zhen1,2,PENGYi1,LIXiao2ling1,CHENZhi2qiang1(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China,hit-changyong@163.com;2.CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100124,China)Abstract:Toinvestigatetheoccurrenceandcharacteristicsofdenitrifyingphosphorusremoval,alab2scaleA2Oreactorwithworkingvolumeof5215Lwasemployedtotreatmunicipalwastewater.TheeffectsofinfluentCOD/TNratioandthevolumeratioofanoxiczonetoaerobiczoneondenitrifyingphosphorusremovalwerestudied.Resultsshowthat36%oftotalsolublephosphoruscanberemovedintheanoxicreactorwhentheHRTis8h,sludgerecycleratiois70%andinternalrecycleratiois250%.Resultsofbatchexperimentshowthatmorethan3514%ofphosphorusaccumulatingorganisms(PAOs)intheA2Osystemcanbedenitrified.TheratioofanoxicphosphorusuptakeincreaseswiththedecreaseofinfluentCOD/TNratio.Denitrifyingphosphorusremovalcanalsobeenhancedbyincreasingtheratioofanoxiczonetoaerobiczonefrom1/1to5/8.Meanwhile,theTNremovalefficiencyisincreasedfrom62%to70%.Itisamoreenergy2efficientwaycomparedwiththeincreaseofinternalrecycleratio,whichcanincreasetheratioofanoxicphosphorusuptake.EnhancingthedenitrifyingphosphorusremovalinA2Oprocessisaneffectivewaytoenhancebiologicalnutri2entremovalintreatingmunicipalwastewaterwithlowC/Nratio.Keywords:wastewatertreatment;denitrifyingphosphorusremoval;A2Oprocess;C/Nratio:2008-04-01.:(2008ZX07317-007-105);(PHR20090502);-(PXM2008-014204-050843);(QAK200802).:(1980),,;(1949),,,.A2O,,,,,,[1,2].KubaMUCT[3].[4,5],A2O,,A2O,A2O,25%.350%,,,,.,[6].A2O,,,.,,.A2O.1111A2O1.,--.5215L,9,2,2,5,112;,,5/5/8.,.2122.26L.1.;2.;3.;4.;5.;6.;7.;8.1A2O.:15715L/d,HRT8h,SRT15d,MLSS35004000mg/L,70%,250%.A/O,.112,,COD,NH4ClKH2PO4.:COD:37218mg/L;NH4+-N:4113mg/L;PO43--P:3186mg/L,PO43--P71510mg/L.:MLSSMLVSSCODNH4+-NTNNO2--NNO3--NPO43--PTPpHDOORP.pHDOORPWTW-340i,.PHATong[7]..(PAOs)(DPAOs)Wachtmeister[8].,4LSBR,(COD=300mg/L)2h,,3h,50mg/LNO3--N3h,Kanox/KaerDPAOsPAOs.(mg/L),:Pan=QRco+(Qin+Qr)caQin+QR+Qr-can.:Qin(L/h);QR(L/h);Qr(L/h);caPO43--P(mg/L);canPO43--P(mg/L);coPO43--P(mg/L).2211A2O,,,50d,,CODNH4+-NPO43--P8618%9715%9515%.,?74?8,:A2OA2O,.2.2PO43--PPHA2,,911mg/L,36%.,PHA38%PHA,.,[8],3.3,Kanox/Kaer01354,3514%,.3-212A2OHu[9],,,.,,.,(COD/TN,C/N)A2O.4C/NA2O,4,C/N,.C/N3186,62%,C/N12152,2316%.,,,,PHA,.4C/NA2O213A2O212,C/N,,TN,C/N4,60%,TN60%,[10].,A2O,[5].,,,C/N.C/N5,,1/15/8,5.5TNTP5,,TP?84?4196%,,TN,6212%7017%,TN1516mg/L,20mg/L.,60%.,.31)A2O,.HRT=8h,70%,250%,3514%.2),C/N,.C/NTN.C/N4,60%,TN62%.3)C/N,,1/25/8,A2O,TN70%.,.:[1],.[J].,2000,26(12):1-4.[2],.A2O[J].,2003,29(3):22-26.[3]KUBAT,LOOSDRECHTvanMCM,BRANDSEFA,etal.Occurrenceofdenitrifyingphosphorusremo2vingbacteriainmodifiedUCT-typewastewatertreat2mentplants[J].WaterRes,1997,31(4):777-786.[4]WANGX,WANGS,PENGY.AnoxicbiologicalphosphorusuptakeinA2Oprocess[J].ChineseJChemEng,2005,13(4):516-521.[5],,,.A2O[J].,2005,56(8):1565-1570.[6],,,.[J].,2003,19(4):19-22.[7]TONGJ,CHENY.Enhancedbiologicalphosphorusremovaldrivenbyshort-chainfattyacidsproducedfromwasteactivatedsludgealkalinefermentaion[J].EnvironSciTechnol,2007,41:7126-7130.[8]WACHTMEISTERA,KUBAT,LOOSDRECHTvanMCM.Asludgecharacterizationassayforaerobicanddenitrifyingphosphorusremovingsludge[J].Wa2terRes,1997,31(3):471-478.[9]HUZ,WENTZELMC,EKAMAGA.Anoxicgrowthofphosphate-accumulatingorganisms(PAOs)inbio2logicalnutrientremovalactivatedsludgesystems[J].WaterRes,2002,36:4927-4937.[10]BERNATK,WOJNOWSKAB,DOBRZYSKAA.DenitrificationwithendogenouscarbonsourceatlowC/NanditseffectonP(3HB)accumulation[J].WaterRes,2008,99:2410-2418.()?94?8,:A2O