化学/生物联合工艺处理城市污水研究

采用聚合硅酸铁混凝剂，直接投加到反应器中(即投加混凝剂活性污泥法)，考察其对COD、氮、磷的去除效果，并与对生物反应器出水再进行混凝沉淀(即后混凝法)进行对比。结果表明：投加混凝剂活性污泥法,COD和TN的去除率略有提高，但两种工艺没有明显的区别；后混凝法对TP的去除率略高于投加混凝剂活性污泥法,但其出水中铁离子的含量远高于投加混凝剂活性污泥法，且需要增加一套混凝、沉淀设备，因此直接将混凝剂投加到生物反应器中比较适合于辅助除磷。

Study on municipal wastewater treatment by chemical and biological process

As a kind of coagulant, polyferric silicate is used to compare the remo val effects on COD, nitrogen, and phosphorus in feeding coagulant into biologica l reactor directly(feeding coagulant activated sludge process) with that of feeding coagulant into the bioreactor effluent(post-coagulating pro cess). Results indicate that the removal efficiency of COD and TN increases a little but there is no distinct dif ference between the two kinds of processes. The removal efficiency for TP of pos t-coagulating process is a little higher than that of feeding coagulant activate d sludge process, while the concentration of Fe ion in the former process, which also needs a series of equipment for coagulating and settling, is far stronger than that in latter process. So it is suitable for accessorial phosphorus remova l to feed coagulant into the bioreactor.