A2O工艺中的反硝化除磷及其强化吴昌永

41　820098　　　　　　　　　JOURNALOFHARBININSTITUTEOFTECHNOLOGY　Vol.41No.8Aug.2009　　　　　　A2O吴昌永1,彭永臻1,2,彭轶1,李晓玲1,陈志强1(1.,150090,[e-mail];2.,100124)　:为研究A2O工艺中的反硝化除磷现象及影响因素,采用52.5L的A2O反应器处理实际污水.结果表明:正常运行的A2O工艺中存在反硝化除磷现象,在系统HRT为8h,污泥回流比为70%和内回流比为250%的情况下,A2O系统中缺氧区吸磷占总吸磷量的36%左右,序批试验表明,此时反硝化除磷菌占总除磷菌的35.4%.原水的C/N比越低,反硝化除磷的比例越高,但是过低的C/N比会导致TN去除率低下.将缺氧区和好氧区的容积比从1/1扩大到5/8,延长反硝化除磷反应的时间,TN去除率可从62%提高到70%左右,相比单纯提高内回流比更节能.强化A2O工艺中的反硝化除磷,为传统A2O工艺在处理低C/N比污水时提高脱氮除磷效率提供了一个新思路.:污水处理;反硝化除磷;A2O工艺;C/N比:X703.1:A:0367-6234(2009)08-0046-04CharacteristicsofdenitrifyingphosphorusremovalinA2OprocessWUChang-yong1,PENGYong-zhen1,2,PENGYi1,LIXiao-ling1,CHENZhi-qiang1(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China,[e-mail];2.CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100124,China)Abstract:Toinvestigatetheoccurrenceandcharacteristicsofdenitrifyingphosphorusremoval,alab-scaleA2Oreactorwithworkingvolumeof52.5Lwasemployedtotreatmunicipalwastewater.TheeffectsofinfluentCOD/TNratioandthevolumeratioofanoxiczonetoaerobiczoneondenitrifyingphosphorusremovalwerestudied.Resultsshowthat36%oftotalsolublephosphoruscanberemovedintheanoxicreactorwhentheHRTis8h,sludgerecycleratiois70%andinternalrecycleratiois250%.Resultsofbatchexperimentshowthatmorethan35.4%ofphosphorusaccumulatingorganisms(PAOs)intheA2Osystemcanbedenitrified.TheratioofanoxicphosphorusuptakeincreaseswiththedecreaseofinfluentCOD/TNratio.Denitrifyingphosphorusremovalcanalsobeenhancedbyincreasingtheratioofanoxiczonetoaerobiczonefrom1/1to5/8.Meanwhile,theTNremovalefficiencyisincreasedfrom62%to70%.Itisamoreenergy-efficientwaycomparedwiththeincreaseofinternalrecycleratio,whichcanincreasetheratioofanoxicphosphorusuptake.EnhancingthedenitrifyingphosphorusremovalinA2Oprocessisaneffectivewaytoenhancebiologicalnutri-entremovalintreatingmunicipalwastewaterwithlowC/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、.1　试　验1.1　A2O1.,--.52.5L,9,2,2,5,、1∶1∶2;,,、5/5/8.,.21～22℃.26L.1.;2.;3.;4.;5.;6.;7.;8.1　A2O　　、.:157.5L/d,HRT8h,SRT15d,MLSS3500～4000mg/L,70%,250%.A/O,.1.2　,,COD,NH4ClKH2PO4.:COD:372.8mg/L;NH4+-N:41.3mg/L;PO43--P:3.86mg/L,PO43--P7.5～10mg/L.:MLSS、MLVSS、COD、NH4+-N、TN、NO2--N、NO3--N、PO43--P、TP、pH、DO、ORP.pH、DOORPWTW-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).2　结果与讨论2.1　A2O,,,50d,,COD、NH4+-NPO43--P86.8%、97.5%95.5%.,·47·8,:A2OA2O,.2.2　PO43--PPHA　　2,,9.1mg/L,36%.,PHA38%PHA,.,[8],3.3,Kanox/Kaer0.354,35.4%,.3　-2.2　A2OHu[9],,,.,,.,(COD/TN,C/N)A2O.4C/NA2O,4,C/N,.C/N3.86,62%,C/N12.52,23.6%.,,,,PHA,.4　C/NA2O2.3　A2O2.2,C/N,,TN,C/N4,60%,TN60%,[10].,A2O,[5].,,,C/N.C/N5,,1/15/8,5.5　TNTP　　5,,TP·48·　　　　　　　　　　　　　　　　　　　　　41　96%,,TN,62.2%70.7%,TN15.6mg/L,20mg/L.,60%.,.3　结　论1)A2O,.HRT=8h,70%,250%,35.4%.2),C/N,.C/NTN.C/N4,60%,TN62%.3)C/N,,1/25/8,A2O,TN70%.,.参考文献:[1]　,.[J].,2000,26(12):1-4.[2]　,.A2O[J].,2003,29(3):22-26.[3]　KUBAT,LOOSDRECHTvanMCM,BRANDSEFA,etal.Occurrenceofdenitrifyingphosphorusremo-vingbacteriainmodifiedUCT-typewastewatertreat-mentplants[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].Wa-terRes,1997,31(3):471-478.[9]　HUZ,WENTZELMC,EKAMAGA.Anoxicgrowthofphosphate-accumulatingorganisms(PAOs)inbio-logicalnutrientremovalactivatedsludgesystems[J].WaterRes,2002,36:4927-4937.[10]　BERNATK,WOJNOWSKAB,DOBRZYSKAA.DenitrificationwithendogenouscarbonsourceatlowC/NanditseffectonP(3HB)accumulation[J].WaterRes,2008,99:2410-2418.(　刘　彤)·49·8,:A2O