强化混凝-电气浮过滤处理低浊高色地下水

Underground water with high chroma and low turbidity treated by process of enhanced coagulation-electro flotation filtration

超低浊度高色度地下水给水水源中色度主要由溶解性有机物产生,常规混凝-沉淀-过滤工艺难以使处理后出水色度达标,为此,提出强化混凝-电解气浮过滤工艺进行除色研究.通过混凝药剂筛选及电极比选,确定最优的处理参数.实验结果显示:强化混凝阶段,最佳药剂为聚合氯化铁(PFC),其最佳投药量为40mg/L;电解气浮过滤阶段,铝电极的处理效果优于铁电极,且在铝电极作为阳极的条件下其最佳滤速为5.5m/h,运行周期12h.其出水色度达到《生活饮用水卫生标准》(GB5749-2006)的要求.

To decrease the chroma caused by the dissolved organic mater（DOM） in underground water with extra-low turbidity and high chroma treated by regular coagulation-sedimentation-filtration process,an enhanced coagulation-electro floatation filtration process was put forward.By coagulation agent selection and anode comparison,optimal parameters were determined.Experimental results showed that the best agent for enhanced coagulation was PFC and the optimum dosage was 40 mg/L.Iron and aluminum were used as anodes respectively in electro floatation filtration, the result of which indicated that aluminum surpassed iron. With the aluminum anode, the proper filtering velocity was 5.5 m/h and the operational cycle time was 12 h. The outlet water of this process can satisfy the standard for ehroma in Sanitary Standard for Drinking Water（ GB5749 -2006）.