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作 者:张跃军[1] 赵晓蕾[1] 李潇潇[1] 刘程[1] 朱玲玲[1]
出 处:《高校化学工程学报》2011年第2期331-336,共6页Journal of Chemical Engineering of Chinese Universities
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:研究了硫酸铝(AS)与聚二甲基二烯丙基氯化铵(PDM)制成的AS/PDM复合药剂对夏季太湖预氯化高藻水的除藻效果。通过混凝除藻实验,考察了PDM质量分数(5%~20%)与特征黏度(0.55~3.99 dL·g-1)对除藻效果的影响。结果表明,对温度29~30℃,浊度50~53 NTU,藻含量6.88×104个.mL-1的加氯水,使用AS、AS/PDM(0.55/5%~3.99/20%)复合药剂后的余浊达到2 NTU的水厂沉淀出水浊度标准时,其加药量(Al2O3计)分别为5.86 mg·L-1、4.84~2.97mg·L-1,除藻率分别为90.67%、91.80%~96.90%。因此,使用AS/PDM复合药剂可明显提高AS对夏季太湖加氯水的处理效果: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;PDM质量分数或特征黏度越大,复合药剂的处理效果越好;其优势还体现在降低沉淀出水COD和NH3-N,并有可能减少出厂水加氯量等方面。The efficiencies of algae-removal for Taihu Lake prechlorination algae-rich water in summer time by using AS/PDM composite coagulants composed of aluminum sulfate(AS) and polydimethyldiallylammonium chloride(PDM) were investigated.The effects of mass percents(5%~20%) and intrinsic viscosity values(0.55~3.99 dL g 1) of PDM in composite coagulants on algae-removal ratios were studied through coagulation and algae-removal experiments.The results show that,for chlorinated water with temperature of 29~30℃,turbidity of 50~53 NTU and algae content of 6.88×104 cells mL 1,in order to reach the turbidity of 2 NTU in settled water,which is required by the standard of the water plant,the necessary dosage(based on Al2O3) of AS and AS/PDM(0.55/5%~3.99/20%) composite coagulants are respectively 5.86 mg L 1 and 4.84~2.97 mg L 1,and the algae-removal ratios are 90.67% and 91.80%~96.90%,respectively.It was found that,using AS/PDM composite coagulants can evidently enhance the treatment efficiency of AS for Taihu Lake chlorinated water in summer.Compared with using AS solely,the AS dosages in composite coagulants are saved if the required residual turbidities obtained are the same;and the treatment efficiencies are enhanced if the AS dosages in composite coagulants used are the same as the AS dosages used for using AS solely.It was also found that the higher mass percent or intrinsic viscosity of PDM is,the better treatment efficiency of composite coagulant has.The advantages of using composite coagulants also embody the abilities of decreasing COD and NH3-N in settled water,and likely reducing chlorine dosage in finished water.
关 键 词:聚二甲基二烯丙基氯化铵(PDM) 硫酸铝(AS) 复合药剂 除藻 夏季太湖水 预氯化
分 类 号:X703.5[环境科学与工程—环境工程]
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