三种絮凝剂除藻效果的比较

以合肥市环城河为研究对象,采用聚合氯化铝（PAC）、聚合氯化铝铁（PAFC）、聚合硫酸铝铁（PAFS）三种絮凝剂对该含藻水体进行强化混凝除藻、除浊的试验研究,考察了絮凝剂种类及添加量、水样的pH、助凝剂的种类以添加量等因素对强化混凝效果的影响。结果表明：在相同添加量时,聚合氯化铝的除藻、除浊效果最好,当添加量为27 mg/L时,叶绿素a的去除率为87.46%,浊度的去除率为92.74%,添加高分子助凝剂PAM、HCA对原水的浊度、叶绿素a有一定的去除效果,助凝剂与絮凝剂的配合使用可改善絮凝剂的的混凝去除效果,助凝剂PAM的效果较好,当PAM的投加量为2 mg/L时,叶绿素a的去除率可提高5.91%,浊度的去除率可提高1.70%。

Comparison of Alage Removal Effect of Three Kinds of Flocculant

The enhanced coagulation for removing algae and turbidity carried out in huan cheng river of Hefei were performed using PAC,PAFC and PAFS respectively.The influences of coagulant type and dosage,pH of raw water,flocculent type and dosage on the enhanced coagulation efficiency were investigated.The result showed that the Coagulation efficiency of PAC was better than PAFC、PAFS.The optimum dosage of PAC was 27 mg/L according to the quality of water,and the removal rate of the turbidity and chlorophyll a was 92.74 % and 87.46 %.The adding of PAM,HCA has effect to the removal of turbidity,chlorophyll a of raw water,the combination of coagulant and flocculent can improve the removal rate of the turbidity and chlorophyll a.The coagulation efficiency of PAM was better than HCA.When the dosage of PAM was 2 g/L,the removal rate of the turbidity chlorophylla can be increased 1.70 % and 5.91 % respectively.