混凝强化处理生活污水的试验

Domestic Sewage Treatment by Coagulation

混凝法可以强化生活污水的一级处理.对于某小区生活污水,采取混凝强化一级处理进行了实验研究,用聚合氯化铝、硫酸铝和PAM进行单剂及复配使用处理废水.结果表明,投加聚合氯化铝对水质的净化效果明显优于投加硫酸铝.进行絮凝剂复配实验时,当10%聚合氯化铝投加量为2.0 mL,PAM投加量为1×10-8mg/L时,去除率可达到84.21%,即原水COD值为380 mg/L时,出水COD值可达到60.00 mg/L,达到国家污水综合排放标准GB8978-96的一级标准.强化一级处理可以使一级处理效果进一步得到改善,水质明显变好.

The primary treatment of domestic sewage can be enhanced by coagulation. For the domestic sewage, coagulating agent such as polyaluminium chloride, aluminum sulfate and polyacrylamide were used individually or in combination. The result shows that the purification effect using polyaluminium chloride is superior to that using aluminum sulfate, and that the effluent can reach the integrated wastewater discharge standard GB8978-96 when aluminum polychloride is combined with PAM. Enhanced primary treatment can improve the treatment efficiency and the effluent quality.