PAC/PDM对夏季太湖预氯化高藻水的除藻效能  

Algae-removal Effects of PAC/PDM on Taihu Lake Prechlorination Algae-rich Water in Summer

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,江苏南京210094

出　　处：《南京理工大学学报》2010年第4期570-574,共5页Journal of Nanjing University of Science and Technology

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

摘　　要：用聚氯化铝(PAC)与聚二甲基二烯丙基氯化铵(PDM)制成系列稳定型PAC/PDM复合药剂,研究其对夏季太湖预氯化高藻水的除藻效能。通过烧杯混凝除藻实验,考察了PDM质量分数(5%～20%)与特征黏度(0.55～3.99 dL/g)不同的复合药剂对除藻效能以及沉淀出水COD和NH-N3的影响。结果表明,对温度29～30℃,浊度34～37 NTU,藻细胞密度6.24×104个/mL的加氯水,使用PAC、PAC/PDM(0.55/5%～3.99/20%)复合药剂后的余浊达到2NTU的水厂沉淀出水浊度标准时,其加药量(Al2O3计)分别为7.69、5.55～3.32 mg/L,除藻率分别为89.50%、91.54%～94.01%。复合药剂对加氯水COD和NH-N3的去除率比单独使用PAC时明显提高。因此,PAC/PDM复合药剂可明显提高PAC对夏季太湖加氯水的除藻效能,与单独使用PAC相比,沉淀出水余浊达标时节省加药量,加药量相等时提高除藻处理效果,改善出水水质。The algae-removal efficiencies of the series of stable PAC/PDM composite coagulants composed of polyaluminum chloride（PAC） and polydimethyldiallylammonium chloride（PDM） on Taihu Lake prechlorination algae-rich water in summer are researched.The effects of composite coagulants with different mass percents（5%～20%） and intrinsic viscosity values（0.55～3.99 dL/g） of PDM on algae-removal rates and on values of COD and NH-N3 of effluent water after coagulation and sediment are studied through jar tests.The results show that for chlorine-added water with temperature of 29～30 ℃,turbidity of 34～37 NTU and algae cell density of 6.24×104 cells/mL,when residual turbidity of 2 NTU in effluent water is required by water plant,the dosages（based on Al2O3） of PAC,PAC/PDM（0.55/5%～3.99/20%） composite coagulants are 7.69,5.55～3.32 mg/L and the algae-removal rates are 89.50%,91.54%～94.01% respectively.Using composite coagulants can obviously increase the removal rates of COD and NH-N3 to chlorine-added water compared with using PAC solely.PAC/PDM composite coagulants can evidently enhance the algae-removal efficiencies of PAC on Taihu Lake chlorine-added water in summer.Compared with the single use of PAC,the PAC dosages in composite coagulants are saved if the residual turbidities are required in a same level.The treatment effects are enhanced and the effluent water quality is improved when the PAC dosages in composite coagulants are the same as the PAC dosage of using PAC solely.

关 键 词：聚二甲基二烯丙基氯化铵 聚氯化铝 复合药剂 除藻 夏季太湖水 预氯化 

分 类 号：TU991.5[建筑科学—市政工程]