桂林市饮用水源突发性Pb^(2+)污染的应急处理技术

Emergency Treatment of Gusty Pb^(2+) Pollution for Drinking Water Source in Guilin

采用烧杯实验对桂林市自来水厂突发性Pb2+污染应急处理技术进行了研究。结果表明:自来水厂现行工艺以及多年平均PAC投加量条件下,能处理的进水最大Pb2+浓度为0.02 mg/L;改变混凝剂组分,可以使进水Pb2+浓度超标4倍的出水水质达标;投加PAM可以提高Pb2+去除效果,能使Pb2+浓度0.1 mg/L的原水经处理后出水水质达标。使出水达标的最小混凝剂投加量与进水Pb2+浓度的关系为y=-1 141.4x2+296.17x-3.084 9;在保证出水残余Pb2+浓度达到《生活饮用水卫生标准》(GB 5749—2006)要求的条件下,根据此式计算出不同原水Pb2+浓度下的最小药剂投加量,为桂林市饮用水源突发性Pb2+污染应急处理提供依据。

Emergency treatment for drinking water sudden pollution is studied by beaker experiment.In the condition of polyaluminium chloride（PAC） average dosage,the water plant can handle the concentration of Pb2＋ of 0.02 mg/L.Changing the composition of coagulant and increasing the polyacrylamide（PAM） can improve the removal of Pb2＋.To make the water up to the standard,the relationship between the minimum coagulant and the concentration of Pb2＋ in influent water is y=-1 141.4x2＋296.17x-3.084 9（mg/L） in the condition of appropriate component of coagulants and dosage of PAM.The relationship between Pb2＋ concentration in raw water and the minimum drug dosage is significant to ensure the residual Pb2＋ concentration up to the drinking water health standards（GB 5749-2006）,providing Pb2＋ pollution emergency treatment for drinking water source in Guilin.