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5 1环境工程学报Vol.5,No.120111ChineseJournalofEnvironmentalEngineeringJan.2011A/O龚 正 龙腾锐 曹艳晓 傅婵媛(,400045) C/N,,A/O。100%,200%,1∶1,(HRT)2、2.43h,A/O,A/O。,3h,。COD、、TN302mg/L、58.64mg/L64.26mg/L,COD、、TN30mg/L、0.09mg/L28.64mg/L,89.94%、99.85%56.40%,A/O。 C/N X703.1 A 1673-9108(2011)01-0085-05Studyonperformanceofstep-feedbiologicalnitrogenremovalA/OprocessGongZheng LongTengrui CaoYanxiao FuChanyuan(KeyLaboratoryofThreeGorgesReservoirRegion'sEco-Environment,MinistryofEducation,ChongqingUniversity,Chongqing400045,China)Abstract AimedatthedifficultyinbiologicalnitrogenremovalfromlowC/Nwastewater,thelab-scalestep-feedbiologicalnitrogenremovalA/Oprocesswasusedtotreatcampussewage,bysettinginfluentpointsondifferentsectionsoftheanoxictank.Denitrificationefficiencyofstep-feedbiologicalnitrogenremovalA/Oprocesswasinvestigatedundertheconditionsofsludgerefluxratioof100%,nitrificationliquidrefluxratioof200%andhydraulicretentiontimeofanoxictank2h,2.4h,3h,comparedwiththeconventionalA/Oprocess.Theresultsshowthatprocesswillreachthebestremovaleffectwhenhydraulicretentiontime(HRT)isthreehours.TheaverageconcentrationsoftheCOD,ammoniaandTNareseparatelyreducedfrom302mg/L,58.64mg/Land64.26mg/Lto30mg/L,0.09mg/Land28.64mg/L,andtheremovalefficienciesofCOD,ammoniaandTNare89.20%,99.85%and56.40%,respectively,whichindicatethatthetreatmenteffectofthestep-feedbiologicalnitrogenremovalA/OprocessisbetterthanthatoftraditionalbiologicalnitrogenremovalA/Oprocess.Keywords step-feed;sewagewithlowC/N;nitrogenremoval;removalefficiency:(0704K031):2009-11-23;:2009-12-24:(1984～),,,。E-mail:gp0302gz@163.com ,,,。A/O(anoxic/oxicprocess,/)[1]2080,。、、、。[2],,:A/O,:A/O[3]、A/O-MBR[4-5]、H-A-O[6]A/O/N[7];A/O[8-9],A/O,/,,,5,。,,,;,、。,,,,。1 1.1 1。PVC,、、,。40cm×50cm×100cm,150L,A1、A2,3,;900cm×400cm×1100cm,360L,,,;,50cm,,60°;50cm,75L,,。、。1 Fig.1 Flowchartofstep-feednitrogenremovalprocess 50L/h,2,A1;A2。A1、A2(HJ-1841),、、;,,6h,3～4mg/L;,,1.5h;A1(,,,),。1.2 B,。:COD210～372mg/L,BOD5150～175mg/L,NH+4-N40.14～69.75mg/L,NO-2-N0.05～2.10mg/L,NO-3-N1.66～3.99mg/L。,BOD5/TN4～6,,C/N8[10-12],BOD5/TN2.49～2.85,。,20～27℃。1.3 COD:(HACH);NH+4-N:;NO-2-N:N-(1-)-;NO-3-N:;TN:-;MLSS:;DO、:HQ30d(HACH);pH:QH11d(HACH),BOD5(HACH)。861 :A/O1.4 ,100%,12d。,2、2.4h3h,A/O,,A/O。15～20d,1。1 A/OTable1 Step-feedbiologicalnitrogenremovalA/OprocessHRT(h)(%)12.01∶020022.01∶120032.41∶020042.41∶120053.01∶020063.01∶12002 2.1 COD26COD,,COD,50mg/。1～6COD:89.96%、89.72%、88.88%、90.19%、90.05%90.23%,COD89%。,,COD。2 CODFig.2 CODremovalefficiencyunderdifferentoperationmodes2.2 3。3,,3 Fig.3 Ammoniaremovalefficiencyunderdifferentoperationmodes1mg/L。1～6,:97.65%、99.17%、95.92%、99.34%、99.90%99.85%,:1.43、0.41、2.0、0.35、0.060.09mg/L,。:A/O、、,,A1A2;A/O,A1,A2,,A1A/O,,,、6h,。2.3 TNTN4。4 TNFig.4 AverageremovalrateofTNunderdifferentoperationmodes8754,,A/OA/O,6TN:27.63%、30.14%、44.12%、48.16%、42.93%56.40%。,A/O,:,,。Plósz[13],,,;,,NO-3-N,。A/O、、,,[14-15],,,,,;,(A1)、,,,。,,A2,,,,。,HRT,TN,HRT。,、,,,50%,20%,30%[16],Yeom[17]C/N,。,,(),,HRT,。2.4 1～6,:0.048、0.037、0.156、0.003、0.0150.013mg/L,,。2.5 ,,A1、A22。2 Table2 MLSSofanoxictankunderdifferentoperationmodesA1(mg/L)A2(mg/L)1272123572251924373298925434279126265313027156290228131、35A/O,A2A1,MLSS,2、46A/O,A2,A1、A2,,,。A/OAA/O,。2.6 ,A1,、。A2,A/O,,;A/O,,,,。,,,。3 (1),A/OTNA/O。(2),A/O,A/O,,,。881 :A/O(3)A/O:A3h,1∶1,200%,100%。,COD、NH+4-N、NO-3-NTN302mg/L、58.64mg/L、64.26mg/L30mg/L、0.09mg/L28.01mg/L,:89.94%、99.85%55.43%.(4),,,。[1],.A/O.,1996,11(4):1-4[2]OissonG.,NewellB.WastewaterTreatmentSystem:Model-ing,DiagnosisandControl.London:IWAPublishing,1999[3]LarreaL.,LarreaA.,AyesaE.,etal.Deveopmentandverificationofdesignandoperationcriteriaforthestepfeedprocesswithnitrogenremoval.WaterScienceandTechnol-ogy,2001,43(1):261-268[4],.A/O-MBR.,2009,35(1):100-103[5],.A/O.,2008,21(5):9-12[6],.H-A-O.2007,34(4):370-372[7].A/O.,2006,32(5):32-35[8],.A/O.,2008,29(5):1203-1209[9]ZhiguoY.,HerwigB.Controlofextermalcarbonadditiontopredenitrifyingsystems.JournalofEnvironmentalEngineer-ing,1997,123(11):1080-1086[10],..:,2001[11],..:,2001[12],,,.C/N.,2005,25(3):367-371[13]PlószB.G.,JobbágyA.,GradyC.P.L.Factorsinflu-encingdeteriorationofdenitrificationbyoxygenenteringananoxicreactorthroughthesurface.WaterResearch,2003,37(4):853-863[14]TanT.W.,NgH.Y.Influenceofmixedliquorrecycleratioanddissolvedoxygenonperformanceofpredenttifica-tionsubmergedmembrancebioreactors.WaterResearch,2008,42(425):1122-1132[15],.A/O.,2005,37(8):1053-1057[16],,..,2006,22(1):368-375[17]YeomIck-Tae,NahYoo-M,AhnKyu-Hong.Treatmentofhouseholdwastewaterusinganintermittentlyaeratedmem-branebioreactor.Desalination,1999,124(1):193-20489