中文摘要：

根据物料平衡方程重新推导了分段进水生物脱氮工艺的最高理论脱氮率公式,试验考察了不同进水C/N比条件下,各段等比例进水和非等比例进水时的脱氮率.在C/N比为6、8.25和10.5（COD恒定为330mg/L）、各段等比例进水条件下,得出脱氮率分别为80.1%、79.8%和81.3%,与公式计算得出的脱氮率相符.在C/N比为10.5、13和17.5（NH3-N恒定为38mg/L）的情况下,进行了各段非等比例进水条件下的试验研究.试验结果表明在进水流量分配系数λ分别为2.5、3和4的情况下,总氮去除率分别为92.4%、93.8%和96.4%,远高于已有文献的最高理论脱氮率,与推导的最高脱氮率公式相符.

英文摘要：

The formula of theoretical nitrogen removal efficiency for the step feed biological nitrogen removal process was re - deduced based on the mass balance of nitrate nitrogen and verified by the experiments. Nitrogen removal efficiency under uniform influent flow distribution ratios and different influent flow distribution ratio was verified under different C/N ratios. Under the condition of C/N ratio 6, 8.25 and 10. 5 （COD concentration was maintained at 330mg/L）with uniform influent flow distribution ratio in each stage, the nitrogen removal efficiency was 80. 1%, 79.8% and 81.3% respectively corresponding to the theoretical value. Under the condition of high C/N ratio 10.5, 13 and 17.5 （ NH3 - N concentration was maintained at 38mg/L） with different influent flow distribution ratios in each stage, nitrogen removal efficiency were studied. The experimental results showed that nitrogen removal efficiency was 92. 4% , 93.8% and 96. 4% respectively with influent flow distribution ratio k of 2. 5, 3 and 4 respectively, higher than that of reported articles and corresponding to the value of this paper.