间歇式循环延时曝气活性污泥法处理校园生活污水

Study on intermittent cyclic extended aeration sludge process to treat campus wastewater

间歇式循环延时曝气活性污泥法(intermittent cyclic extended aeration sludge,ICEAS)具有投资和运行费用低、占地小、工艺简单、适应性强、耐冲击负荷、处理效果好、运行稳定、剩余污泥少等优点,广泛应用于国内外城镇污水处理厂。利用ICEAS工艺处理校园生活污水,研究了不同运行参数对处理效果的影响并得出最佳运行参数。实验结果表明:利用ICEAS处理校园生活污水的最佳条件运行参数为厌氧3h、曝气3h、缺氧3h、沉淀1h,运行周期为10h。采用最佳运行参数时,ICEAS工艺对TP去除率达到80%以上,NH3-N的去除率达到90%以上,COD的去除率达到95%以上,SS的去除率达到90%以上;并且出水COD、TP、NH_3-N、SS达到城镇污水处理厂污染物排放标准一级B标准(GB 18918—2002)。

Intermittent cyclic extended aeration sludge(ICEAS)has the advantages of low investment and operation cost,small land occupation,simple process,strong adaptability,high impact resistance,good removal performance,less sludge and so on,which have been widely used in domestic wastewater treatment plants.Series of performance data of ICEAS process for treating campus wastewater were obtained by using a bench-scale experimental unit.The data showed the effect of varied operating patterns upon the pollutant removal,which led to the optimum operation parameters.Under the optimum operation parameters,the removal of pollutants of the sewage in terms of COD,NH 3-N,TP and SS reached above 95%,90%,80%and 90%.Meanwhile,the effluents of COD,NH 3-N,TP and SS were lower than the Emission Standard of Town Wastewater Treatment Plant of China(GB 18918-2002)levelⅠpart B.