AS/PDM复合混凝剂对冬季太湖原水除藻效果研究  

Algae-Removal Effect of AS/PDM Composite Coagulants to Winter Taihu Lake Raw Water

作　　者：赵晓蕾[1] 张跃军[1] 李潇潇[1] 刘程[1] 朱玲玲[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《环境科学》2009年第4期1023-1028,共6页Environmental Science

基　　金：江苏省社会发展计划项目太湖专项项目(BS2007121);"十五"国家科技攻关项目(2003BA327C)

摘　　要：由聚二甲基二烯丙基氯化铵（PDM）与硫酸铝（AS）制成的系列稳定AS/PDM复合混凝剂,用于冬季太湖原水的除藻效果研究.通过混凝除藻实验,考察了复合混凝剂加药量、AS与PDM复配质量比（20∶1-5∶1）、PDM特征黏度（0.55-3.99 dL/g）对除藻效果的影响,分析了使用复合混凝剂替代预加氯工艺的可行性.结果表明,对原水使用AS、AS/PDM（0.55/20∶1-3.99/5∶1）复合混凝剂后的余浊达到2 NTU的水厂沉淀出水浊度标准时,其加药量（以Al2O3计）分别为4.24 mg/L、3.96-1.87 mg/L,除藻率分别为83.00%、87.52%-90.93%;加药量为4.24 mg/L时,其除藻率分别为83.00%、88.29%-97.66%,余浊分别为2.00NTU、1.76-0.43 NTU.对加氯水的加药量为4.50 mg/L时,AS/PDM（1.53/10∶1）复合混凝剂对原水的处理效果优于AS对加氯水的处理效果;AS/PDM（3.99/5∶1）复合混凝剂对原水的处理效果优于AS、AS/PDM（0.55/20∶1）、AS/PDM（1.53/10∶1）复合混凝剂对加氯水的处理效果.因此,AS/PDM复合混凝剂可明显提高AS对冬季太湖原水的处理效果,与单独使用AS相比,余浊达标时节省加药量,加药量相等时提高处理效果.此外,使用复合混凝剂还可替代预氯氧化工艺中加氯对混凝除藻作用的部分功能,有利于提高水质安全性.The series of stable AS/PDM composite coagulants prepared by polydimethyldiallylammonium chloride （PDM） and aluminium sulphate （AS） were used to research the algae-removal effect to winter Taihu Lake raw water. The effects of dosage of composite coagulants, composite mass ratios （20：1-5：1） of AS and PDM, intrinsic viscosity values （0.55-3.99 dL/g） of PDM on algae-removal rates were studied through coagulation and algae-removal experiments. The feasibility of using composite coagulants to substitute prechlorination process was analysed. The results show that when residual turbidity of 2 NTU to water after coagulation and sediment is required by water plant, the dosage （based on A12 03） of AS, AS/PDM （0.55/20：1-3.99/5：1） composite coagulants are 4.24 mg/L, 3.96-1.87 mg/L, and the algae-removal rates are 83.00%, 87.52%-90.93% respectively. When dosage to raw water are 4.24 mg/L, the algae-removal rates of AS, AS/PDM （0.55/20 ： 1-3.99/5 ： 1 ） composite coagulants are 83.00 %, 88.29 % -97.66 %, and the residual turbidities are 2.00 NTU, 1.76-0.43 NTU respectively. When dosage to chlorine-added water are 4.50 mg/L, the treatment effect of AS/PDM（ 1.53/10：1 ） composite coagulant to raw water is better than that of AS to chlorine-added water, and the treatment effect of AS/PDM（3.99/5 ： 1 ） composite coagulant to raw water is better than that of AS, AS/PDM （0.55/20 ： 1 ） and AS/PDM （ 1.53/10 ： 1 ） composite coagulants to chlorine-added water. So using AS/PDM composite coagulants can enhance evidently the treatment effect of AS to winter Taihu Lake raw water. Compared with using AS solely, the dosage of AS in composite coagulants are saved when the residual turbidities are required in same level, and the treatment effect of AS is enhanced when the dosage of AS in composite coagulants are same as that of using AS solely. Moreover, using composite coagulants can replace the part chlorine-added function on increasing coagulation and algae-removal in prechlorinati

关 键 词：聚二甲基二烯丙基氯化铵(PDM) 硫酸铝(AS) 复合混凝剂 除藻 冬季太湖原水 

分 类 号：X703.5[环境科学与工程—环境工程]