氧化性聚硅铁对黄河水的混凝处理研究

Coagulation Treatment of Yellow River Water by Oxidative Poly-Si-Fe

分别以氧化性聚硅铁(OPSF)和聚合氯化铝铁(PAFC)作为混凝剂处理黄河水。在混凝处理黄河水的中试中,OPSF出现絮体较早且尺寸较大,沉降性能优异,大幅降低了过滤反冲洗的次数;PAFC出现絮体所需的时间较长且絮体小而轻,沉降性能较差,出水时其絮体大部分仍为漂浮状态,给过滤带来很大负担。OPSF对浊度、CODMn的去除效果均优于PAFC,且细菌总数及残余氯化物浓度明显低于PAFC,而余氯值高于PAFC;OPSF沉后水的pH值为7.76,满足饮用水要求。中试结果证明,OPSF完全可以应用到黄河原水的处理中,并且具备较优异的混凝效果。

A pilot test for treating Yellow River water by oxidative poly-Si-Fe （OPSF） and poly- meric aluminum ferric chloride （PAFC） coagulants was carried out. OPSF produced the flocs early with large size and excellent settleability, which reduced the number of backwashings. PAFC developed the flocs after long time with small size, light weight and poor settleability, which burdened the filtration process. OPSF achieved better removal of turbidity and CODMn than PAFC, and had lower total plate count, lower residual chloride and higher chlorine than PAFC. The pH value of the sedimentation effluent by OPSF was 7.76, which met the requirement for drinking water. The results of the pilot test demonstra- ted that OPSF could be applied for treating Yellow River water as drinking water due to its excellent coag- ulation performance.