混凝法控制膜生物反应器污泥膨胀的试验

目的 利用混凝法控制一体式膜生物反应器的污泥膨胀，以减轻反应器的膜污染，降低运行成本．方法 向反应器中投加混凝剂，经活性污泥30min静沉试验，检测污泥的沉降性能，并测量反应器出水COD、NH3-N值，通过改变投加混凝剂的种类和剂量，测试不同条件下混凝剂对污泥沉降性能和反应器污水处理效果的影响．结果试验表明，投加氯化铁混凝剂，能够有效提高活性污泥的沉降性能．在已经发生膨胀的反应器中，连续投加混凝剂和助凝剂则效果更好．并且，混凝法控制反应器污泥膨胀的同时，可提高膜生物反应器处理污水中有机物的能力，COD去除率提高11．68％．结论 通过对发生污泥膨胀的膜生物反应器投加混凝剂，不但可以有效地控制活性污泥的膨胀，而且能够强化处理效果．其中投加氯化铁的效果最佳，并且提高了MBR中处理有机物的能力．

Study on the Treatment of Sludge Bulking with Flocculation Technology in MBR

Flocculation technology was used to control sludge bulking in MBR that could reduce membrane fouling and operation cost.Coagulant was added into MBR to contrast kinds of coagulant effects worked on sludge bulking.In the research of the treatment of sludge bulking with flocculation technology in MBR,several kinds of coagulant had been used to treat active sludge bulking.Results showed that the effect of chlorination ferric was obvious,which could effectively improve sludge subsidence performance,and the removal rate of COD increased by 11.68%.Thus,the treatment of sludge bulking with flocculation technology in MBR had practical value,which could effectively control sludge bulking and improve the removal rate of COD.