摘要
采用由聚二甲基二烯丙基氯化铵(PDM)与聚合氯化铝(PAC)制成的系列稳定PAC/PDM复合混凝剂,用于冬季太湖原水的除藻性能研究.通过混凝除藻试验,考察了复合混凝剂加药量、PAC与PDM复配质量比例(20∶1—5∶1)、PDM特征黏度(0.55—3.99dL/g)对除藻性能的影响,探讨了使用复合混凝剂替代预加氯工艺的可行性及深度处理时复合混凝剂的除藻性能.结果表明:(1)对原水使用PAC、PAC/PDM(0.55/20∶1—3.99/5∶1)复合混凝剂后的余浊达到2NTU的水厂沉淀出水浊度标准时,其加药量分别为3.05mg/L、2.91—2.24mg/L,除藻率分别为85.95%、87.26%—92.28%;加药量为3.05mg/L时,其除藻率分别为85.95%、88.03%—96.00%,余浊分别为2.00NTU、1.55—0.53NTU.(2)对加氯水的加药量为3.40mg/L时,PAC/PDM(1.53/10∶1)复合混凝剂对原水的处理效果优于PAC、PAC/PDM(0.55/20∶1)复合混凝剂对加氯水的处理效果;PAC/PDM(3.99/5∶1)复合混凝剂对原水的处理效果优于PAC、PAC/PDM(0.55/20∶1)、PAC/PDM(1.53/10∶1)复合混凝剂对加氯水的处理效果.(3)满足余浊<1NTU的深度处理要求时,PAC/PDM(0.55/20∶1—3.99/5∶1)复合混凝剂比PAC减少藻含量11.2%—59.2%,节省加药量6.7%—26.3%.因此,PAC/PDM复合混凝剂与PAC相比,余浊达标时节省加药量,加药量相等时提高处理效果.使用PAC/PDM复合混凝剂可以替代预氯化工艺中混凝除藻作用的部分功能,且是未来深度处理时有效的技术储备.
The series of stable PAC/PDM composite coagulants prepared by polyaluminum chloride（PAC）and polydimethyldiallylammonium chloride（PDM）were used to research the algae-removal performance to Taihu Lake raw water in winter season.The effects of composite coagulant dosages,composite mass ratios（20∶1—5∶1）of PAC and PDM,intrinsic viscosity values（0.55—3.99dL/g）of PDM on algae-removal performance were studied through coagulation and algae-removal experiments.The feasibility of using composite coagulants to replace prechlorination process and the algae-removal performance of composite coagulants at deep treatment were discussed.The results showed that when residual turbidity of 2NTU in effluent water after coagulation and sedimentation was required by water plant,the dosages（based on Al2O3）of PAC,PAC/PDM（0.55/20∶1—3.99/5∶1）composite coagulants were 3.05mg/L,2.91—2.24mg/L,and the algae-removal rates were 85.95%,87.26%—92.28%,respectively.When dosages to raw water were 3.05mg/L,the algae-removal rates of PAC,PAC/PDM（0.55/20∶1—3.99/5∶1）composite coagulants were 85.95%,88.03%—96.00%,and the residual turbidities were 2.00NTU,1.55—0.53NTU,respectively.When dosages to chlorine-added water were 3.40mg/L,the treatment effect of PAC/PDM（1.53/10∶1）composite coagulant to raw water was better than that of PAC,PAC/PDM（0.55/20∶1）composite coagulant to chlorine-added water,the treatment effect of PAC/PDM（3.99/5∶1）composite coagulant to raw water was better than that of PAC,PAC/PDM（0.55/20∶1）and PAC/PDM（1.53/10∶1）composite coagulants to chlorine-added water.When deep treatment demand that the residual turbidity must be less than 1NTU was needed,6.7%—26.3% dosages could be saved and 11.2%—59.2% algae content in effluent water could be decreased by using PAC/PDM（0.55/20∶1—3.99/5∶1）composite coagulants compared with using PAC solely.So compared with using PAC solely,the PAC dosages in composite coagulants are saved when the residual turbidities are required in same level,and the treatment effect of PAC is enhanced when the PAC dosages in composite coagulants are same as that of using PAC solely.Using PAC/PDM composite coagulants can partly replace the chlorine function on increasing algae-removal effect in prechlorination process.The technique of applying composite coagulants may be an effective reservation when deep treatment will be needed in future.
出处
《应用基础与工程科学学报》
EI
CSCD
2010年第5期807-815,共9页
Journal of Basic Science and Engineering
基金
江苏省社会发展计划项目太湖专项(BS2007121)
"十五"国家科技攻关项目(2003BA327C)
