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CAST刘少武1,周娇1,张智1,王峰青2(1.重庆大学三峡库区生态环境教育部重点实验室,重庆400045;2.重庆市水务集团,重庆400010):根据李家沱污水处理厂的实际运行经验以及对近7个月的运行数据的分析,得出适用于城市污水处理厂CAST工艺脱氮的运行工况和运行参数值结果显示,运行工况污泥回流比和碳氮比是影响CAST工艺脱氮效果的主要因素,通过合理调整运行工况可减弱低进水碳氮比和高氮负荷带来的不利影响;在污泥龄为15dMLSS为3500~4500mg/L回流比为30%时,脱氮率可达到70%以上,出水TN稳定达标:CAST;运行工况;脱氮:X703:A:1000-4602(2009)11-0005-04StudyonCASTProcessforNitrogenRemovalLIUShao-wu1,ZHOUJiao1,ZHANGZhi1,WANGFeng-qing2(1.KeyLaboratoryofThreeGorgesReservoirRegion.sEco-EnvironmentMinistryofEducation,ChongqingUniversity,Chongqing400045,China;2.ChongqingWaterGroup,Chongqing400010,China)Abstract:BasedonthepracticaloperationexperienceofLijiatuoWWTPandtheanalysisofoper-ationdatacollectedforsevenmonths,theappropriateoperationpatternandparametersofCASTfornitro-genremovalwereobtained.Theoperationpattern,recycleratioofsludgeandC/Nratioarethemostim-portantfactorswhichaffectthetotalnitrogenremova.lThedisadvantagesbroughtbylowinfluentC/Nra-tioandhighnitrogenloadcanbeweakenedbyadjustingoperationconditions.Whenthesludgeageis15d,theMLSSis3500to4500mg/Landthesludgerecycleratiois30%,thenitrogenremovalratecanachieveover70%,andtheeffluentTNconcentrationisstableatalevelbelowthedischargestandard.Keywords:CAST;operationpattern;nitrogenremoval,56(GB18918)2002),[12],CAST,[3~5],,7,CAST,CAST1试验方法111,4@104m3/d,8@104m3/d,,CAST1@104m3/d#5#251120096CHINAWATER&WASTEWATERVo.l25No.11Jun.2009112TPTNTN4%,50%,45%11Tab.1Influentqualitymg#L-1CODBOD5TPNH3-NTN35018043540))66037613.740.795.650.73.9767.5291.0010.823.2111.253191316.1426.260.331.62.05113COD:;BOD5:;TN:);NH3-N:;TP:);TKN:;:;:N-(1-)-114(2),15d2Tab.2OperationpatternsofLijiatuoWWTP/%A/(2h)(1h)(1h)10/20/30B(2h)(2h)(1h)(1h)10/20/30C(1h)/(2h)(1h)(1h)(1h)10/20/30D/(3h)(2h)(1h)10/20/30:DO2.0~5.0mg/L,DO0.5mg/L2结果与讨论21115d,MLSS3500~4500mg/L,1/3,20%~30%,4CASTTN0.04gN/(gMLSS#d),(1)ABD,,C,CAST,2h,DO,,CDO,/,,1CASTFig.1TNremovalefficiencybyCASTprocessunderdifferentoperationpatterns,0.03gN/(gMLSS#d),[6]7,0.04gN/(gMLSS#d),TNNH3-N,,CAST0.04gN/(gMLSS#d)212C,22CASTFig.2TNremovalefficiencybyCASTprocessunderdifferentwatertemperatures30~35e,5~35e,#6#2511[7~9]2,,20e,,TN,CAST,2130.04gN/(gMLSS#d),C33CASTFig.3TNremovalefficiencybyCASTprocessunderdifferentrecycleratios3,,10%,60%;20%,70%;30%,82%,30%[1011],30%,/,CAST214,,15d20%~30%0.04gN/(gMLSS#d),C44CASTFig.4TNremovalefficiencybyCASTprocessunderdifferentC/Nratios4,4,,;,[7],,,,,,,4,CAST,,4,C,3结论¹,C(1h)/(2h)(1h)(1h)(1h),30%15dDO2.0~5.0mg/LDO0.5mg/L,GB18918)2002A,Bº0.04gN/(gMLSS#d),CAST,»4,CAST,(下转第11页)#7#:CAST2511[5],,,CODCOD100mg/L,C/N,,,,3结论¹C/NCOD,,C/N20,COD100mg/LºC/N20COD100mg/L,A/OSBR,135min,,»,5mg/L,¼135min,:[1]WangDong-bo,LiXiao-ming,YangQ,ietal.Biologicalphosphorusremovalinsequencingbatchreactorwithsin-gle-stageoxicprocess[J].BioresourTechno,l2008,99(13):5466-5473.[2],,.[J].,2008,28(9):1800-1806.[3],,.SBR[J].,2007,28(3):534-539.[4].(4)[M].:,2002.[5]RE,NE.(8)[M].:,1984.:(1983-),,,,:1399116337213519102762E-mail:mary29@163.com:2009-01-03(上接第7页):[1]JanssenPMJ,MeinemaK.[M]..:,2005.[2].Carrousel[J].,2003,19(12):101-102.[3],.CASS[J].,2003,19(2):34-35.[4],.CAST[J].,2006,22(15):58-61.[5]GoronszyMC.Aerateddenitrifyinginful-lscaleactiva-tedsludgefacility[J].WaterSciTechno,l1997,35(10):103-110.[6].()[M].:,2000.[7].[M].:,2006.[8].[M].:,1999.[9]USAEPA.NitrogenControl[M].Pennsylvania:Tech-nomicPublishingCompanyInc,1991.[10],.[M].:,1998.[11]DemoulinG,RudigerA,GoronszyMC.Cyclicactivatedsludgetechnology)recentoperatingexperiencewitha90000p.e.plantinGermany[J].WaterSciTechno,l2001,43(3):331-337.:(1977-),,,,:13983809091E-mail:lswu7611@163.com:2008-12-10#11#:SBR2511