中文摘要：

采用A／O同步脱氮除磷工艺处理模拟城市污水，考察了好氧段DO浓度对该工艺处理效果的影响。结果表明，好氧段DO浓度对系统脱氮除磷效果的影响显著，当DO控制在1．5mg／L左右时，系统的处理效果最佳，可实现同步硝化反硝化和反硝化除磷，对NH4^＋-N、TN、TP、COD的去除率分别为99．12％、94．61％、92．85％、96．10％，平均出水NH4^＋-N、TN、TP、COD分别为0．25、0．68、0．5和10mg／L。

英文摘要：

A/O process for simultaneous nitrogen and phosphorus removal was used to treat simulated urban sewage. The influence of DO in aerobic zone on the treatment efficiency was investigated. The results show that the nitrogen and phosphorus removal efficiency in the system is significantly affected by the DO. When the DO is controlled at about 1.5 mg/L, the treatment efficiency of the system is optimal, simultaneous nitrification and denitrification and denitrifying phosphorus removal can be achieved. The removal rates of NH4^＋ - N, TN, TP and COD are 99.12% , 94.61% , 92.85% and 96.10% respectively. The average concentrations of NH4^＋ - N, TN, TP and COD in the effluent are 0.25, O. 68, 0.5 and 10 mg/L respectively.