复合混凝剂的强化混凝效果及絮体分形结构变化  

Enhanced Coagulation Efficiency of Composite Coagulants and Change of Floc Fractal Structure

作　　者：龙国庆[1] 梁咏梅[2] 叶挺进 张再利[2] 刘超斌[2] 

机构地区：[1]广东省电力设计研究院,广东广州510663 [2]中山大学环境科学与工程学院,广东广州510275 [3]佛山市水业集团有限公司,广东佛山528000

出　　处：《中国给水排水》2010年第19期95-98,共4页China Water & Wastewater

基　　金：广东省部产学研项目(2009B090300369);佛山市禅城区产学研项目(2009B1042);广东省环境污染控制与修复技术重点实验室开放研究基金资助项目(2006K0008)

摘　　要：将聚合氯化铝(PAC)分别与高锰酸钾、水合二氧化锰进行复配而得到复合混凝剂,研究了两种复合混凝剂对微污染水源水的处理效果,并考察了投药量、投药方式对混凝效果的影响,同时还对混凝过程中絮体结构的变化进行了研究。结果表明,两种复合混凝剂均具有良好的去除浊度和有机污染物的能力,当PAC投量为15 mg/L时,两种复合混凝剂分别在KMnO4投量为0.1 mg/L、水合MnO2投量为0.15 mg/L时达到最佳混凝效果。絮体分维值能很好地描述絮体结构的变化规律,在混凝过程中,两种复合混凝剂的絮体分维值均表现出先增(均在360 s时达到最大值)后逐渐减小的规律,可见絮体经历了从小到大、从松散到密实再到松散的过程。Composite coagulants were prepared by combining PAC with KMnO4 and MnO2 respectively. The treatment efficiency of micro-polluted source water by two composite coagulants was studied, and the effects of dosage and addition mode on the coagulation efficiency were investigated. Furthermore, the changes of floe structure during coagulation were studied. The results indicate that the two composite coagulants can effectively remove turbidity and organic pollutants. When the dosages of PAC, KMnQ and MnO2 are 15 mg/L, O. 1 mg/L and 0.15 mg/L respectively, the effieiencies of the two composite coagu- lants are the best. The fractal dimensions can describe the change of floc structure. The fractal dimen- sions of the two composite coagulants have an initial increase and subsequent decrease, and both the max- imum values are achieved at the time of 360 s. It is concluded that the floes experience a process from small to big, from incompaet to compact and back to incompact.

关 键 词：复合混凝剂 强化混凝 絮体 分形结构 分维值 

分 类 号：TU991.2[建筑科学—市政工程]