A^2/O—BAF工艺对生活污水的脱氮除磷效能研究

Removal of Nitrogen and Phosphorus from Domestic Sewage by A^2/O-BAF Process

为解决包头市某生活污水厂出水氨氮浓度偏高的问题,采用厌氧/缺氧/好氧池加曝气生物滤池组合工艺处理该生活污水,考察系统稳定运行后对COD、TN、NH+4-N、TP的去除规律以及温度对除污效果的影响。结果表明,A^2/O—BAF组合工艺对该城市生活污水具有良好的脱氮除磷效果,对COD、NH+4-N、TN、TP的去除率分别达到92.67%、94.62%、83.12%和92.55%,最终出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。温度降低会对组合系统的运行效果产生不利影响,尤其是对TN和NH+4-N的去除效果影响较大,对COD、TP的去除则影响较小。

To solve the problem of high concentration of NH4＋ - N in the effluent from a sewage treatment plant in Baotou City, the combined process of A2/O and BAF was used to treat the domestic sewage. The removal efficieneies of COD, TN, NH4 - N and TP as well as the effect of sewage tempera- ture on pollutant removal were investigated. The results showed that the combined process was effective in nitrogen and phosphorus removal, and the average removal rates of COD, NH4＋ - N, TN and TP were 92.67%, 94.62%, 83.12% and 92.55% respectively. The effluent quality could meet the first class A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. Decrease in temperature would affect the operation efficiency of the combined process, especially the removal of TN and NH4＋ - N, while the removal of COD and TP was slightly affected.