A／A／O--MBR组合工艺强化去除氨氮及其硝化速率

第32卷第4期2O1O年O8月土木建筑与环境工程JournalofCivil．Architectural&EnvironmentalEngineeringVoI．32No．4Aug．2O1O．，MBR组合工艺强化去除氨氮及其硝化速率陈卫，武迪，朱宁伟，郑晓英，李激，羊鹏程(1．河海大学环境学院，南京210098；2．无锡市排水管理处，江苏无锡214011)摘要：将PVDF帘式中空纤维膜组件与A／A／O工艺结合，构建“A／A／O—MBR”强化生物脱氮的中试系统，用于处理太湖流域城镇污水。针对组合工艺的脱氮效果，以组合工艺MBR池内活性污泥的硝化速率为研究对象，分析了溶解氧(DO)浓度、进水氨氮浓度和温度对硝化速率的影响。结果表明，组合工艺在夏季和冬季的氨氮平均去除率分别稳定为96．56和96．68；低温(T<15℃)条件下，进水氨氮浓度对硝化速率影响不大；温度升高硝化速率加快，温度为30．5℃时组合工艺的硝化速率为11．8℃时的2．6倍；与常规工艺相比，组合工艺的硝化速率是氧化沟工艺的2．3倍。组合工艺两级硝化空间形成的较长水力停留时间和MBR内膜的截留作用补偿了低温对硝化速率的影响。关键词：A／A／O—MBR组合工艺；低温；氨氮去除率；硝化速率中图分类号：X703．1文献标志码：A文章编号：1674-4764(2010)04—0090—06EnhancedAmmoniaRemovalandNitrificationRateofA／A／O-MBRCombinedProcessWUDi，ZHUNing-wei，ZHENGXiao—ying，LIJi，YANGPeng-cheng(1．CollegeofEnvironmental，HohaiUniversity，Nanjing210098，P．R．China；2．WuxiDrainageManagementOffice，Wuxi214011，Jiangsu，P．R．China)Abstract：BycombiningthemembranebioreactorofthePVDFhollowfibermembranewiththeA／A／Oprocess，apilottestsystemofA／A／O—membraneprocess(A／A／O—MBR)wasconstructedandemployedintreatingmunicipalwastewaterinTaihuLakeBasin．Accordingtothenitrogenremovalofcombinedprocess，thenitrificationrateofactivatedsludgeinMBRwasstudied．Theeffectofdissolvedoxygenconcentration，influentammonianitrogenconcentrationandtemperatureonnitrificationratewasanalyzed．Itisfoundthattheaverageremovalratesofammonianitrogenofcombinedprocessare96．56and96．68insummerandwinter，respectively．Influentammoniaconcentrationhaslittleeffectonnitrificationrateatlowtemperatureoflessthan15．0℃．Highertemperatureswouldspeedupthenitrificationrateandthenitrificationrateofcombinedprocessat30．5℃was2．6timesthanthatat11．8℃．Comparedwiththeconventionalprocess。nitrificationrateofcombinedprocesswas2．3timesthanthatinoxidationditch．TheenhancednitrificationoflonghydraulicretentiontimeformedbytwonitrificationphaseandtheroleofmembranefiltrationinMBRoffsettheinhibitoryeffectsoflOWtemperatureonnitrificationrate．Keywords：A／A／O—MBRcombinedprocess，Lowtemperature，Ammonia—nitrogenremovalrate，Nitr．fjcationrate收稿日期：2010—01—02基金项目：国家科技支撑项目(2006B