溶解氧浓度对连续流活性污泥工艺反硝化除磷的影响  

Effects of dissolved oxygen concentration on denitrifying phosphorus removal in continuous-flow activated sludge process

作　　者：王荣昌[1] 司书鹏[1] 郑翔[1] 杨殿海[1] 励建全 赵建夫[1] 

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海200092 [2]上海市城市建设设计研究院,上海200125

出　　处：《化工学报》2011年第6期1708-1715,共8页CIESC Journal

基　　金：国家自然科学基金项目(50908164);国家科技支撑计划课题(2006BAJ04A07);教育部留学回国人员科研启动基金项目(20091508);上海市建委重大科研项目(2007-008);同济大学青年优秀人才培养行动计划(2007KJ015);上海市科技人才计划项目(09XD1404100)~~

摘　　要：引言随着水体富营养化问题的日渐突出,污水处理技术逐渐从单一去除有机物为目的的阶段进入既要去除有机物又要脱氮除磷的深度处理阶段[1]。然而传统的生物脱氮除磷工艺仍存在一些不足之处：Effects of dissolved oxygen（DO）concentration on removal performance of nitrogen and phosphorus were investigated in a pilot-scale anaerobic-anoxic-aerobic（A2/O）activated sludge process for treating municipal wastewater.During run operation,sludge recycling ratio and internal mixed liquid recirculation ratio were kept constant at 150% and 100%,respectively.The results showed that DO concentration played an important role in nutrient removal by A2/O process.Denitrifying phosphorus removal was observed when aerobic tank was kept at low DO（DO=1.0—1.5 mg·L-1）conditions.The best performance of nutrient removal was achieved when DO concentration was kept at 0.2 mg·L-1 in anoxic tank and 1.0 mg·L-1 in aerobic tank.Total nitrogen（TN）and total phosphorus（TP）removal was about 64.6% and 89.6%,respectively.TN and TP concentration in the effluent was（11.9±5.3）mg·L-1 and（0.17±0.09）mg·L-1,respectively.TP removal in anoxic tank was about 48.2% of the total TP removal by the whole process.Denitrifying phosphorus removal became an important way of dephosphorization.Denitrifying phosphorus removal bacteria（DPB）accounted for 55.7% of the total phosphorus accumulating organisms（PAOs）based on the results of denitrifying phosphorus removal activity analysis.The analysis for particle diameter distributions showed that the particle diameter of activated sludge in aerobic tank was larger than those in anaerobic and anoxic tanks.Larger particle diameter resulted in the existence of anaerobic or anoxic microenvironments in the sludge particles in aerobic tank,which favored the survival and propagation of DPBs in the whole system.Therefore,the nutrient removal performance and cost-efficiency of conventional activated sludge processes can be enhanced by maintaining low DO in aerobic tank and improving denitrifying phosphorus removal activity in anoxic tank.

关 键 词：溶解氧 A2/O工艺 反硝化除磷菌 聚磷菌 连续流 

分 类 号：X172[环境科学与工程—环境科学]