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选用两种无机高分子混凝剂聚合氯化铝(PAC)和聚合氯化铝铁(PAFC),与传统混凝剂Al2(SO4)3处理微污染地表水。以浊度和CODMn去除率为主要指标,考察投药量和pH对混凝效果的影响。通过考察沉淀时间对浊度去除效果的影响,结合实验现象,讨论三种混凝剂生成矾花的大小和沉降性能。结果发现,PAC和PAFC在5mg/L的投药量下可以取得较好的混凝效果,出水符合GB 5749-2006《生活饮用水卫生标准》。三种混凝剂的最佳pH为6,PAFC受pH影响较小,当pH为5～8时可取得较好的CODMn去除效果。PAFC生成的矾花体积较大,沉降性能较好,在实际应用中可缩短沉淀池的水力停留时间。
Two types of inorganic polymer coagulants, PAC and PAFC, were selected to treat micro-polluted surface water with traditional coagulant Al2 (SO4) 3. Turbidity and CODMn removal rate as the main indicators to examine the dosage and pH on the coagulation effect. By investigating the influence of settling time on turbidity removal, combined with the experimental phenomena, the size and sedimentation performance of three kinds of coagulant to generate alum were discussed. The results showed that PAC and PAFC at 5mg / L dosage can get better coagulation effect, effluent meet the GB 5749-2006 “drinking water health standards.” The optimum pH of the three coagulants is 6, PAFC is less affected by pH, and better removal of CODMn can be obtained when the pH is 5 ~ 8. The alum produced by PAFC has larger volume and better sedimentation performance, which can shorten the hydraulic retention time of sedimentation tank in practical application.