CAST工艺处理城市污水的强化脱氮研究胡坚

CAST胡坚1,潘绵立2,严敏3,喻一萍1,王亚宜3(1.镇江市水业总公司排水管理处,江苏镇江212001;2.华东医药集团有限公司生物工程研究所,浙江杭州310011;3.浙江工业大学建筑工程学院,浙江杭州310032):介绍了镇江征润州污水处理厂CAST工艺的运行情况,结合该厂实际运行状况开展了强化脱氮效果的生产性试验研究结果表明,该工艺对CODSS和TP的去除率均能维持在80%以上,但对氨氮的去除效果较差;在该厂运行模式下,控制进水/曝气前30min的DO0.5mg/L进水/曝气后30min的DO浓度在1.0~3.0mg/L纯曝气DO浓度在2.0~3.0mg/L,可以实现同步硝化反硝化和硝化/反硝化作用下的共同脱氮,使脱氮效率提高了57%左右;在控制进水/曝气后DO0.5mg/L纯曝气DO浓度在1.0~3.0mg/L的条件下,可以实现同步硝化反硝化作用下的脱氮,但较难实现理想的脱氮效果:城市污水;CAST;生物脱氮;同步硝化反硝化:X703.1:C:1000-4602(2006)15-0058-04StudyonEnhancedBiologicalNitrogenRemovalfromMunicipalWastewaterbyCASTProcessHUJian1,PANMianli2,YANMin3,YUYiping1,WANGYayi3(1.DivisionofSewerageManagement,ZhenjiangWaterIndustryCompany,Zhenjiang212001,China;2.BiotechInstitute,HuadongMedicineGroupCo.Ltd.,Hangzhou310011,China;3.SchoolofArchitectureandCivilEngineering,ZhejiangUniversityofTechnology,Hangzhou310032,China)Abstract:TheCyclicActivatedSludgeTechnology(CAST)wasappliedtotreatmunicipalwastewaterfromZhengrunzhouWastewaterTreatmentPlan.tThefullscaleexperimentonenhancednitrogenremovalwascarriedou.tResultsshowthatCASTiscapableofremovingbiodegradableCOD,SSandTP,andthattheaverageremovalratesareupto80%.However,theeffectofnitrogenremovalisnotasgood.SNDandSQNDcanbeachievedandnitrogenremovalincreasedby57%undertheconditions:theconcentrationofdissolvedoxygeniscontrolledbelow0.5mg/Lfor30minutesbeforeinflow/aeration,2.0-3.0mg/Lduringpureaeration,and1.0-3.0mg/Lfor30minutesafterinflow/aeration.Inaddition,SNDcanbeachievedbutwithouthighereffectofnitrogenremovalwhenconcentrationofDOiscontrolledbelow0.5mg/Lafterinflow/aerationand1.0-3.0mg/Lduringpureaeration.Keywords:municipalwastewater;CAST;biologicalnitrogenremova;lsimultaneousnitrificationanddenitrification58第22卷第15期2006年8月中国给水排水CHINAWATER&WASTEWATERVo.l22No.15Aug.2006CAST(CyclicActivatedSludgeTechnology)20036,200410104m3/d(GB89781996),10km,,,,CAST,[12],,,,CAST,CAST1试验方案设计1110104m3/d,11Tab.1InfluentwastewaterqualitymgL-1CODBOD5SSNH3-NTP28616744922.53.1171768781.8216.91105.19224.0814.832.3212CAST4,4h,:/1h1h1h/1h4,CAST45m,9m,6m,112,6m4m,CAST15~25d,2500~4000mg/LCOD(DO)pH13CAST150d(20031220044),CODSSTP80%,(36%),CAST,20045,,:(200456),/DO0.5mg/LDO1.0~3.0mg/L(200478),/DO1.0mg/LDO2.0~5.0mg/L,DO3.0mg/L(2004910),/30minDO0.5mg/L/30minDO1.0~3.0mg/LDO2.0~3.0mg/L14BOD5:;TN:;NH+4-N:;NO-3-N:;NO-2-N:N-(1-)-;TP:;MLSS:2试验结果与讨论21CAST170d,,10d,1,30min21Fig.1VariationsofNH+4-NandTNremovalrate59第15期胡坚,等:CAST工艺处理城市污水的强化脱氮研究第22卷230minFig.2VariationsofNO-3-Nconcentrationatfirst30minafterpureaeration12,30min,,,,,,3%,;,50%1,,,,22pHC/NSRTDO,,,DO,CAST,,,12,20d,,,;110d90%,,8CAST,,33,100min,DO3Fig.3VariationofNO-3-Nduringonecycle23,12,DO,NH+4-N90%,/30minDO0.5mg/L,,();/30minDO,DO1.0~3.0mg/L,SND;DO2.0~3.0mg/L,,DO,,24TNCAST3,,30min,TN44TNFig.4VariationsofTNconcentrationwithtime4,30minTN,60第15期中国给水排水第22卷,DOSND,,/(SQND),,/30minDO0.5mg/L,DO,DO,SND,;DO,SND,SQND,,,/,,,4,,TN,SNDSQND,3结论CAST,/30minDO0.5mg/L/30minDO1.0~3.0mg/LDO2.0~3.0mg/L,SNDSQND,/DO0.5mg/L,DO1.0~3.0mg/L,SND,CAST,,,SND,SND;,,:[1],.CASS[J].,2003,19(2):34-35.[2]GoronszyMC.Aerateddenitrifyinginfullscaleactivatedsludgefacility[J].WaterSciTechno,l1997,35(10):103-110.:13067912553E-mail:[e-mail]:2006-02-15(上接第57页),SUFR8,,63%,,CSTR:[1],,.SUFR[J].,2005,25(4):512-514.[2]UptonJ,HayesE,ChurchlyJ.BiologicalphosphorusremovalatStratforduponAVON,UK:theeffectofinfluentwastewatercharacteristicsoneffluentphosphate[J].WaterSciTechno,l1996,33(12):73-79.[3],.[M].:,1995.[4]H..[M].,.:,2005.[5],.[M].:,1997.[6],,.[J].,1995,15(2):171-176.[7].[M].:,2004.[8].[M].:,1993.[9].[M].:,2003.:[phone]E-mail:[e-mail]:2006-04-1861第15期胡坚,等:CAST工艺处理城市污水的强化脱氮研究第22卷