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国家强制要求城镇污水厂将尾水的排放标准由一级B提高至一级A,且通过政策以及经济手段鼓励企业开展再生水的回用。混凝过滤工艺用于深度处理可以有效去除SS和总磷,使用聚合氯化铝、硫酸铝和氯化铁作为混凝剂对比实验。使用PAC作为混凝剂,深度处理后出水总磷可以达到0.1 mg/L,SS基本可以稳定在8mg/L以下。
The state mandates that urban sewage treatment plants raise the tail water discharge standard from Grade A to Grade A, and encourages enterprises to recycle the reclaimed water through policies and economic means. Coagulation filtration process for deep treatment can effectively remove SS and total phosphorus, the use of polyaluminum chloride, aluminum sulfate and ferric chloride as a coagulant comparative experiment. Using PAC as coagulant, total phosphorus in effluent after deep treatment can reach 0.1 mg / L, and SS can be basically stable below 8 mg / L.