CASS工艺脱氮影响因素分析樊红辉

34820098ENVIRONMENTALSCIENCEANDMANAGEMENTVol.34No.8Aug.2009:2009-03-10:(1981-),,,,。:1674-6139(2009)08-0093-04CASS樊红辉1,林华东1,2,花勇刚1(1.,400044;2.,402160)　:针对CASS工艺脱氮的效果不够理想、效率不高、出水不够稳定的现象,对脱氮的主要影响因素曝气时间、DO、温度、λ进行了生产性试验研究,分析结果表明,曝气时间3h,DO2.5mg/L是本污水厂最合理的参数控制值,曝气时间3h时NH3-N和TN的平均去除率分别为89.7%和59.7%,DO2.5mg/L时NH3-N和TN的平均去除率分别为94.5%和71.3%,脱氮效果良好;温度对脱氮的效果有很明显的影响,春季的脱氮效果明显好于冬季;脱氮效果随冲水比的增高而降低,但出水均达标说明CASS工艺有良好的抗冲击负荷的能力。:DO;曝气时间;λ;参数控制:X703.1:AAnalysisontheFactorsAffectingtheRemovalofNitrogenwithCASSProcessFanHonghui1,LinHuadong1,2,HuaYonggang1(1.FacultyofUrbanConstructionandEnvironmentEngineering,ChongqingUniversity,Chongqing400044,China;2.YongchuanGlobalCreditWaterLimitedCompany,Chongqing402160,China)Abstract:Inviewofthephenomenonoftheremovaleffectofnitrogenwasunideal,theefficiencywasnothigh,theeffluentwasunstableoftheCASSprocess,andforthemaininfluentfactorssuchas:aerationtime,DO,temperature,λ,afull-scaletrialwerecarriedon.Theresultsofanalysisshowedthattheaerationtime3handtheDO2.5mg/Lwerethemostreasonablevalueofparametercontrol.Whentheareationtimewas3h,theremovalsofNH3-NandTNwere89.7%and59.7%respectively.WhentheDOwas2.5mg/L,theremovalsofNH3-NandTNwere94.5%and71.3%respectively.Theeffectofremovalwaswell.Thetemperaturehadobviousinfluenceontheremovalofnitrogen.Theremovalefficiencyofnitrogeninspringwassignifi-cantlybetterthaninwinter.TheremovalefficiencyofnitrogenwasreducedwiththeλIncreased.ButtheeffluentalwaysmeetingthestandardofdischargeindicatedthattheCASSprocesshadastrongcapabilityofresistingtheshockload.Keywords:DO;aerationtime;λ;parametercontrol　　CASS,Goron-szyICEASDSBR[1]。CASS、,、、、。CASS、、、、、[2]。1　20079,6.25,5/,。CASS,,,,CASS。,,20%,。CASS,CASS,4,,。,,,-,(SND),。VFA,[3-6]。·93·34820098·CASSVol.34No.8Aug.2009CASS,,COD、BOD5、SS、TP,,80.8%、91.8%、87.9%、95%,,。,-1h、4h、1h、1h,,,C/NNH3-NTN。,,,,,,,,CASS。1,,,NH3-N31.5mg/L～43.1mg/L,37.9mg/L,TN45.9mg/L～79.8mg/L,54.8mg/L,。《》(GB18918-2002)。1　mg/LBOD5180≤20COD360≤60SS200≤20NH3-N30≤8TN35≤20TP4≤1.52　CASS、DO、、(λ)、PH、SRT、、C/N,,。2.1　,,,。2h、3h、4h,,:SRT8～12d、MLSS3000～4500mg/L、SV18～24、λ0.1～0.3、DO2～3mg/L。10。1　NH3-N2　TN　　1,NH3-NTN。NH3-N24.1·94·34820098·CASSVol.34No.8Aug.2009～44.1mg/L,33.0mg/L,,2hNH3-N12.8mg/L～3.0mg/L,78.9%,;3hNH3-N7.6～0.2mg/L,89.7%,;4hNH3-N1.8～0.1mg/L,98.2%,。,4hNH3-N,,3hNH3-N4h,。TN,2,2hTN15.4mg/L～25.7mg/L,51.8%,NH3-N,;3h16.5mg/L～20.2mg/L,59.7%,;4h14.5mg/L～19.3mg/L,63.7%,。,,,3h,。2.2　DODO3.0、2.5、2.0、1.5、1.0mg/L,3h,,DO10。3　NH3-NTNDO　　3DONH3-NTN,,NH3-NDO=3.0、2.5、2.0mg/L,0.95mg/L、2.21mg/L、2.29mg/L,,DO=1.5、1.0mg/L,。DO=3.02.5mg/LTN,73.3%、71.3%,16.2mg/L、17.1mg/L,DO=2.0mg/L,1.51.0mg/L。TN,DO2.5～3.0mg/L,,DO2.5mg/L。CASSNH3-N,TN(SND)/(SQND),,DONH3-N,SND,TNDO2mg/L～3mg/L,SND,DO0.5mg/L,TN[7]。2.3　CASS。15℃～30℃,10℃[8]。CASS,(12)(3)。3h,DO2～3mg/L,。4　NH3-N　　4NH3-N39.4mg/L、38.8mg/L,,4.4mg/L、1.7mg/L,88.8%95.8%,。·95·34820098·CASSVol.34No.8Aug.20095　TN　　5,TNNH3-N,TN55.8mg/L57.7mg/L,17.2mg/L16.4mg/L,67.5%70.9%,TN,。,,,,,,。2.4　CASS,λ,,,CASS;λ,,,CASS,。λ7-8,,,,2h,DO2mg/L～3mg/L,。CASS3.35m,4.85m,λ0.03～0.33,λ=0.1、0.2、0.3,3.5m、4.0m、4.5m。67λ0.1、0.2、0.3NH3-NTN。6　λNH3-N7　λTN(下转第100页)·96·34820098·Vol.34No.8Aug.2009(3),,,。:[1]王亚宜.反硝化除磷脱氮机理及工艺研究[D].哈尔滨工业大学工学博士学位论文,2004:6.[2]T.Kuba,M.C.M.VanLoosdrecht,etal.Phos-phorusandNitrogenRemovalwithMinimalCODRequirementbyIntegrationofNitrificationinaTwo-sludgesystem[J].Wat.Res,1996,42(1-2):1702-1710.[3]SmoldersG,VanD.J,VanL.M,etal.Stoichiomet-ricmodeloftheaerobicmetabolismofthebiologicalphosphorusremovalprocess[J].BiotechnologyandBioengineering,1994,44:837-848.[4]ZhouY,PijuanM,YuanZG.Freenitrousacidinhibi-tiononanoxicphosphorusuptakeanddenitrificationbypoly-phosphateaccumulatingorganisms[J].BiotechnolBioeng,2007,98:903-912.[5]J.P.Kerrn-Jespersen,M.Henze,R.Strube.Bio-logicalphosphorusreleaseanduptakeunderalternatinganaero-bicandanoxicconditionsinafixed-filmreactor[J].WaterRes,1994,28:1253-1255.[6]J.Meinhold,E.Arnold,S.Isaacs.EffectofNitriteonAnoxicPhosphateUptakeinBiologicalPhosphorusRemovalActivatedSludge[J].WaterRes,1999,33:1871-1883.[7]J.Ahn,T.Daidou,S.Tsuneda,etal.Metabolicbe-haviorofdenitrifyingphosphateaccumulatingorganismsundernitrateandnitriteelectronacceptorconditions[J].J.Biosci.Bioeng,2001,92:442-446.[8]王爱杰,吴丽红,任南琪,等.亚硝酸盐为电子受体反硝化除磷工艺的可行性[J].中国环境科学,2005,25(5):515-518.[9]T.Saito,D.Brdjanovic,M.C.M.vanLoosdrecht.EffectofNitriteonPhosphateUptakebyPhosphateAccumulatingOrganisms[J].WaterResearch,2004,38:3760-3768.(上接第96页)　　6NH3-Nλ,λ=0.1、0.2、0.3NH3-N0.48mg/L、1.37mg/L、2.22mg/L,97.3%、91.9%、87.9%,,。7TNλNH3-N,λ=0.1、0.2、0.316.8mg/L、17.9mg/L、18.9mg/L,,57.0%、53.3%、51.9%,。,λ,CASS,,,,λ。3　(1)DO,3h～4hDO2.5mg/L～3mg/L,,SNDSQND。(2),,,。(3)λ,,CASS,λ。(4)CASS,:SRT、、C/N,。:[1]M.C.Goronszy.TheCyclicActivatedSludgeSystemForResortAreaWastewaterTreatment[J].WaterScienceandTechnology,1995,32(9-10):105-114.[2]熊红权,李文彬.CASS工艺在国内的应用现状[J].中国给水排水,2003,1(2):34-35.[3]M.C.Goronszy,朱明权,K.Wutscher.循环式活性污泥法(CAST)的应用及其发展[J].中国给水排水,1996,12(6):4-10.[4]M.C.Goronszy,朱明权,K.Wutscher.循环式活性污泥法在工业废水中的应用[J].中国给水排水,1997,13(1):7-12.[5]N.J.Slater,M.C.Goronszy.TheCyclicActivatedSludgeSystem:aWaytoAchieveDischargeStandards[M].NewWorldW