重金属铅污染应急处理技术中试研究

研究了投加碱液预处理+常规净水工艺对水中铅的去除效果及影响因素。结果表明,该应急处理技术对水中的铅具有较好的去除效果,出水铅含量可降至《生活饮用水卫生标准》限值(10μg/L)以内;聚铝比液铝具有更好的除铅效果,当聚铝投加量为42～48 mg/L,原水pH调节至7.8～8.4,进水铅质量浓度为2.0 mg/L时,出水铅含量最低可降至0.56μg/L;pH值对除铅效果有一定影响,pH值越高出水铅含量越低;清洁滤池时,应采用碱液梯度递减的方式,以保证出水水质。

Pilot test of emergency treatment process for lead contamination

The removal effects of lead and influencing factors with dosing alkaline solution pretreatment and conventional water treatment process were discussed. The results indicated that the process had satisfied removal efficiency of lead, and the effluent concentration of lead was lower than the limited value of the Standards for Drinking Water Quality（ 10μg/L）. Polyaluminum chloride had a better removal effect for lead than liquid aluminum. The effluent concentration of lead could be reduced to 0.56 μg/L with a dosage of polyaluminum chloride 42 to 48 mg/L, pH of raw water 7.8 to 8.4 when the influent concentration of lead was 2.0 mg/L. The pH had certain influence on lead removal. The higher the pH was, the less effluent concentration of lead was. In order to ensure treated water quality, the gradient-decent of alkaline solution should be applied when the filter resumed to backwash.