Using coagulation method to deal with improved A2/O technology effluent, the best value of the test surface flocculation effect appeared in the addition amount of aluminium polychlorid was 0.90 mg/L, the COD removal rate was 88%, and the suspended solids removal rate was 79%.%采用混凝方法处理改良型A2/O工艺出水，试验表面絮凝效果最佳值出现在聚合氯化铝加入量为0.90mg/L时，COD去除率达88%，悬浮物去除率为79%。
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