中文摘要：

通过小试结合模拟计算,分析了某污水处理厂现有运行存在的不足。试验表明,内回流比对提高脱氮率的作用是有限制条件的;对于溶解氧的控制,要根据系统硝化反应的需要来确定;缺氧区/总体积的比例是影响脱氮效果的一个关键因素,在保证硝化不受影响的前提下,增大缺氧区使反硝化进行得更充分,有助于提高系统的脱氮能力。通过模拟计算,对其工艺参数进行了优化组合,在不改变池容、不增加其他处理设施的情况下提出了优化方案,确定其最佳工艺控制参数为：缺氧区/总体积的比例为0.45,混合液内回流比为200%,好氧区溶解氧2 mg/L。调整后的出水总氮为21.77 mg/L,去除率较改造前提高了4%,出水氨氮浓度为1.16 mg/L,去除率提高了7.2%。

英文摘要：

According to the lab test and simulation, this paper analyzed the existing deficiencies of the WWTP. The results showed that： recycle ratio had a conditional impact on the efficiency of nitrogen removal; the dissolved oxygen should be properly determined according to the system nitrification requirements; anoxic zone/total volume ratio was a key factor in ensuring nitrogen removal effect, and under the premise of nitrification would be free from the influence, the increase of anoxic zone would smooth the denitrification of the system. By simulation, the process parameters of the system were optimized, and the optimization plan was brought forward under the pre-condition of no change of the tank and no increase of other equipment. The optimal process parameters were as： anoxic zone/total volume ratio as 0.45, recycle ratio as 200%, aerobic zone DO content as 2 mg/L. After the adjustment, the TP in effluent was 21.77 mg/L, removal efficiency increased by 4 %, NH3--N content was 1.16mg/L, removal efficiency increased by 7. 2%.