聚合铁复合絮凝剂处理地表水的性能研究

Study on Polyferric-Organic Composite Flocculants for Treatment of Surface Water

为改善原水水质不断恶化的状况,使出水达到新的饮用水水质标准,研制出一系列具有不同碱化度(B)、不同PDMDAAC(二甲基二烯丙基氯化铵聚合物)百分含量(P)和不同PDM-DAAC粘度(η)的聚合铁复合絮凝剂(PFC-PDMDAAC)。研究了该絮凝剂对地表水的处理效果,同时考察了B、P和η值对絮凝效果的影响。试验结果表明:PFC-PDMDAAC复合絮凝剂的絮凝效果好于PFC和PDMDAAC。在一定范围内,低B值、高P值的PFC-PDMDAAC具有更好的处理效果,而低η值和高η值的PFC-PDMDAAC分别对除浊和降低UV254更适宜。同时,以高锰酸钾为助凝剂可提高对地表水高锰酸盐指数的去除效果。

A series of composite flocculants Polyferric Chloride （PFC）/Poly-dimethyl-diallylammonium Chloride （PDMDAAC） with different basicities （B） of PFC, different weight percentages （P） and intrinsic viscosities （v/） of PDMDAAC were prepared. The flocculating properties of PFC/PDMDAAC used to treat surface water were studied. The flocculation efficiency of the composite flocculant is found related to the B value, P value and v/value. The experiment results show that PFC/PDMDAAC is more efficient than PFC or PDMDAAC. To some extent, the efficiency of PFC/PDMDAAC is higher at a greater P value and lower B value. The turbidity removal efficiency is higher at a lower v/value, while the removal efficiency of UV254 is larger at a higher η value. It is more efficient to reduce permanganate index by using potassium permanganate as flocculant aid.