A2O工艺的反硝化除磷特性研究吴昌永

A2/O吴昌永1,　彭永臻1,2,　彭　轶1(1.哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090;2.北京工业大学环境与能源工程学院,北京100022)　　　:　为了解传统A2/O工艺中反硝化除磷的作用及强化缺氧吸磷对系统同步脱氮除磷的贡献,以实际生活污水为处理对象,系统研究了缺氧段的反硝化除磷特性及其强化措施,并通过序批式试验考察了除磷微生物种群比例的变化。试验结果表明:稳定运行的A2/O系统中存在反硝化除磷现象,通过提高缺氧段的NO-3-N负荷,可使缺氧除磷贡献率从33.3%提高到53.3%,且系统的除磷率维持在95.4%以上;同时,好氧段的曝气量从400L/h减少到260L/h,节约了近35%;反硝化聚磷菌占聚磷菌的比例由35.4%提高到51.3%左右,微生物种群得到了优化。强化A2/O工艺的反硝化除磷功能,对提高低C/N值污水的脱氮除磷效率及降低运行能耗具有重要的意义。　　:　污水处理;　A2/O工艺;　反硝化除磷;　聚磷菌;　反硝化聚磷菌:X703.1　　:A　　:1000-4602(2008)15-0011-04　　:—;　—(50628808)StudyonCharacteristicsofDenitrifyingPhosphorusRemovalinA2/OProcessWUChang-yong1,　PENGYong-zhen1,2,　PENGYi1(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China;2.CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022,China)　　Abstract:　Inordertoinvestigatedenitrifyingphosphorusremovalintheanoxicstageanditscontri-butiontobiologicalnutrientsremovalintheA2/Oprocess,thecharacteristicsandenhancedmeasuresofdenitrifyingphosphorusremovalwerestudiedbytreatingrealdomesticwastewater.Thevariationofthemicrobialcommunitywasexaminedbybatchexperiments.Theresultsshowthatthephenomenonofdeni-trifyingphosphorusremovalexistsintheA2/Osystemduringstableoperationperiod.Theanoxicphos-phorusuptakeisenhancedfrom33.3%to53.3%byincreasingthenitrateloadingintheanoxicstage,andtheremovalrateofphosphorusismorethan95.4%.Theaerationrateinaerobicstagereducesfrom400L/hto260L/h,savingabout35%.Atthesametime,theratioofDPAOstoPAOsincreasesfrom35.4%to51.3%,andthemicrobialcommunityisoptimized.EnhancingthefunctionofdenitrifyingphosphorusremovalintheA2/OprocesscanincreasethebiologicalnutrientsremovalefficiencyfromlowC/Nwastewaterandreducetheoperatingcost.　　Keywords:　wastewatertreatment;　A2/Oprocess;　denitrifyingphosphorusremoval;　PAOs;·11·24　1520088　　　　　　　　　　　　CHINAWATERWASTEWATER　　　　　　　　　　　　　Vol.24No.15Aug.2008DPAOs　　A2/O、、,。,C/N。,[1]。Hu[2～4],,。A2/O、,,。1　试验材料与方法1.1　A2/O1。1　A2/OFig.1　SchematicdiagramofA2/Oprocess,、、。52.5L,9,2,2,5。、1∶1∶2。,。21～22℃。26L。、。157.5L/d,HRT8h,SRT15d,MLSS3546mg/L,65%,150%,250%。,A/O,。1.2　,、NH4ClKH2PO4COD、NH+4-NPO3-4-P。1。1　Tab.1　Characteristicsofrawwastewater　pH7.35～7.857.45COD/(mg·L-1)199～522309NH+4-N/(mg·L-1)19.33～60.7143.92NO-2-N/(mg·L-1)0～1.030.05　NO-3-N/(mg·L-1)0～1.730.72TN/(mg·L-1)22.56～70.848.56/(mgCaCO3·L-1)211～4203811.3　COD、NH+4-N、NO-2-N、NO-3-N、TN、PO3-4-P、TP、SV、SVI、MLSSMLVSS[5],DOpHWTW-340i。Wachtmeister[6](PAOs)(DPAOs),:4LSBR,(COD=300mg/L)2.5h,,3h,50mg/LNO-3-N3h,(Kanmax/Komax)DPAOsPAOs。。2　结果与分析2.1　A/O,。2(175d)。:150%,66d;250%,56d;,C/N3.8～4.8,54d。2,,·12·24　15　　　　　　　　　　　　　　　　　　　　　　　　　　。2　Fig.2　VariationofphosphorusremovaleffectinA2/Oprocess2.2　3。3　Fig.3　TrendsofanoxicphosphorusuptakeinA2/Oprocess3,,,,33.3%。,NO-3-N,,,NO-3-N,NO-3-N,Hu。250%,53.3%,NO-3-N0.8～1.5mg/L,[7],N、P。,NO-3-NORP:ORP=30.648NO-3-N-261.19(R2=0.9034),ORP,。2.3　Wachtmeister,51148,4。4　51、148//Fig.4　Phosphorusreleaseanduptakeunderanaerobic/anoxicandanaerobic/aerobicconditionsondays51and1484,,,,51d148d42.8%65.8%,Kanmax/Komax35.4%51.3%,DPAOs/PAOs35.4%51.3%,DPAOs。2.4　A2/O,400L/h,,,260L/h,35%。,,COD、NH+4-NTN,85.8%、95.5%73.3%。,A2/O,。C/N。3,C/N,,Wang[8],,C/N,TN(65.6%)。3　结论①　A2/O·13·:A2/O24　15150%250%,NO-3-N0.8～1.5mg/L,,33.3%53.3%,。②　A2/O,,51%。③　,400L/h260L/h,35%,。,C/N3.8～4.8,TN65.6%,TP95.4%。:[1]　KubaT,vanLoosdrechtMCM,HeijnenJJ.PhosphorusandnitrogenremovalwithminimalCODrequirementbyintegrationofdenitrifyingdephosphatationandnitrificationinatwo-sludgesystem[J].WaterRes,1996,30(7):1702-1710.[2]　HuZR,WentzelMC,EkamaGA.Anoxicgrowthofphosphate-accumulatingorganisms(PAOs)inbiologicalnutrientremovalactivatedsludgesystems[J].WaterRes,2002,36(19):4927-4937.[3]　KubaT,vanLoosdrechtMCM,BrandseFA,etal.Oc-currenceofdenitrifyingphosphorusremovingbacteriainmodifiedUCT-typewastewatertreatmentplants[J].Wa-terRes,1997,31(4):777-786.[4]　stgaardK,ChristenssonM,LieE,etal.Anoxicbiologi-calphosphorusremovalinafull-scaleUCTprocess[J].WaterRes,1997,31(11):2719-2726.[5]　.(4)[M].:,2002.[6]　WachtmeisterA,KubaT,vanLoosdrechtMCM,etal.Asludgecharacterizationassayforaerobicanddenitrifyingphosphorusremovingsludge[J].WaterRes,1997,31(3):471-478.[7]　YuanZhiguo,AdrianOehmen,PernilleIngildsen.Controlofnitraterecirculationflowinpredenitrificationsystems[J].WaterSciTechnol,2002,45(4-5):29-36.[8]　WangXiaolian,PengYongzhen,WangShuying,etal.In-fluenceofwastewatercompositiononnitrogenandphos-phorusremovalandprocesscontrolinA2Oprocess[J].BioprocessBiosystEng,2006,28(6):397-404.:(1980-　),　,　,　,　。:13214605201E-mail:[e-mail]:2008-04-08(上接第10页)　scenarioanalysiswithfocusonoperatingcosts[J].Wa-terSciTechnol,2005,52(4):107-115.[7]　MulderA,vandeGraafAA,RobertsonLA,etal.An-aerobicammoniumoxidationdiscoveredinadenitrifyingfluidizedbedreactor[J].FEMSMicrobiolEcol,1995,16(3):177-183.[8]　vandeGraafAA,MulderA,deBruijnP,etal.Anaero-bicoxidationofammoniumisabiologicallymediatedprocess[J].ApplEnvironMicrobiol,1995,61(4):1246-1251.[9]　,,.SBRANAM-MOX[J].,2006,7(2):30-33.[10]　,.[J].,2004,24(4):496-500.[11]