• 关键词：A₂/O-曝气生物滤池工艺  脱氮除磷  泥龄  内循环回流比  低C/N比  反硝化除磷

• 基金项目：国家“十一五”重大科技专项课题(No.2008ZX07317-007-105,2008ZX07209-003);“城市水资源与水环境国家重点实验室”开放基金项目(No.QAK200802)

• 陈永志
• 北京工业大学北京市水质科学与水环境恢复工程重点试验室, 北京 100124

• 彭永臻
• 北京工业大学北京市水质科学与水环境恢复工程重点试验室, 北京 100124

• 王建华
• 北京工业大学北京市水质科学与水环境恢复工程重点试验室, 北京 100124

• 张良长
• 北京工业大学北京市水质科学与水环境恢复工程重点试验室, 北京 100124

• 摘要：以低C/N比实际生活污水为研究对象,重点考查了A₂/O-曝气生物滤池生化系统的脱氮除磷特性.同时,考虑到A₂/O工艺的主要功能是除磷及反硝化,而曝气生物滤池则以硝化为目的.因此,通过缩短A₂/O的泥龄,可将硝化过程从A₂/O中分离出去,让曝气生物滤池完成硝化,实现硝化菌和聚磷菌的分离,并解决了硝化菌和聚磷菌泥龄之间的矛盾.试验结果表明,该生化系统可实现有机物、氮和磷的同步去除.在平均C/N比为4.2,内回流比R为250%的条件下,平均进水COD、TN、TP分别为239.9、57.3和5.1mg·L^-1,平均最终出水COD、TN、TP分别为34.1、13.3和0.1mg·L^-1,去除率分别为85.8%、76.9%和98.3%.曝气生物滤池对氨氮几乎保持了100%的去除率.序批试验表明,反硝化聚磷菌占聚磷菌的比例为40.5%.

• Abstract：The behavior of biological phosphorus (P) and nitrogen (N) removal in a lab-scaled anaerobic/anoxic/oxic (A²/O)-biological aerated filter (BAF) combined system were investigated during the treatment of real domestic sewage with low C/Nratio.In order to solve the conflict of sludge retention time (SRT)between nitrifiers and polyphosphate-accumulating organisms(PAOs),a short SRTwas applied in the A²/Oreactor to wash out the nitrifiers.Therefore,in the system,the A²/Oreactor was mainly used for Premoval and denitrification and the BAFreactor was used for nitrification.The experimental results clearly showed that COD,Nand Pcan be simultaneously removed in this combined system.When the C/Nratio was 4.2 and the internal recycle ratio was 250%,the concentrations of COD,total nitrogen (TN) and total phosphorus(TP)were reduced from 239.9 mg·L^-1,57.3 mg·L^-1 and 5.1 mg·L^-1 in the raw waste water to 34.1 mg·L^-1,13.3 mg·L^-1 and 0.1 mg·L^-1 in the effluent,respectively.The removal efficiencies of COD,TNand TPreached to 85.8%,76.9% and 98.3%,respectively.In addition,almost 100% ammonium nitrogen removal efficiency was achieved in the BAFreactor.Batch tests showed that the population of denitrifying phosphate-accumulating organisms (DPAOs) was up to 40.5% of the total PAOs.

• Key words：the A₂/O-BAF combined process  biological phosphorus and nitrogen removal  sludge retention time (SRT)  the internal recycle ratio (R)  the low C/N ratio  denitrifying phosphorus removal

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