磁絮凝分离/生物滤池组合工艺处理生活污水的效能

Treatment of Domestic Sewage by Combined Process of Magnetic Flocculation Separation and Trickling Filter

为了实现对污水的高效处理，并降低曝气能耗，建立了磁絮凝分离／生物滤池（以炉渣、火山岩为滤料）组合工艺，基于对磁絮凝分离单元中混凝剂、磁种最佳投量的优选，通过对变负荷运行下生物滤池中DO、ORP分布特征对COD、NH4＋-N去除影响的分析，考察了在运行参数优化条件下对生活污水的处理效能。当采用1．0mL／L酸溶粉煤灰混凝剂、1mg／LPAM助凝剂、300mg／LFe304磁种时，磁絮凝分离段对生活污水中COD的去除率可达55％以上，出水总磷低于O．5mg／L。后续的生物滤池稳定运行后，在水力负荷为1．5-5．0m3／（m2·d）的条件下，对COD、NH＋4-N的去除率均可稳定达到70％以上，证实该组合工艺可有效地去除COD，同时实现脱氮除磷。

In order to achieve high-efficiency sewage treatment and reduce the energy consumption for aeration, a combined process of magnetic flocculation separation and trickling filter filled with volcanic rock and slag was constructed. The optimal dosages of coagulant and magnetic seed in the magnetic floe- culation separation unit were determined, and the effects of the distribution characteristics of DO and ORP in the trickling filter operated at different hydraulic loading rates on removal of COD and NH4＋ - N were analyzed to investigate the treatment efficiency of domestic sewage by the combined process with the optimized operation parameters. When 1.0 mL/L of fly-ash based coagulant, 1 mg/L of PAM and 300 mg/L of magnetic seed Fe3 04 were dosed, COD removal rate of more than 55% could be achieved in the magnetic flocculation separation unit, with the effluent TP of less than 0.5 mg/L. After the subsequent treatment with trickling filter at a hydraulic loading rate of 1.5 to 5.0 m3/（ m2 · d）, the removal rates of COD and NH4 - N were more than 70%. The combined system could effectively remove COD, nitrogen and phosphorus synchronously.