Influence of coagulation mechanisms and floc formation on filterability

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Influence of coagulation mechanisms and floc formation on filterability
	Xu, Zhizhen; Chow, Christopher W. K.; Fabris, Rolando; Jiao, Ruyuan; Drikas, Mary; van Leeuwen, John; Wang, Dongsheng
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2017-07-01
卷号	57 期号:0 页码:338-345
关键词	Coagulation Mechanisms Floc Characteristics Filterability Turbidity
英文摘要	Minimizing particles in water is a key goal for improving drinking water quality and safety. The media filtration process, as the last step of the solid liquid separation process, is largely influenced by the characteristics of flocs, which are formed and controlled within the coagulation process. In a laboratory-based study, the impacts of the physical characteristics of flocs formed using aluminum sulfate on the filtration treatment of two comparative water samples were investigated using a photometric dispersion analyzer and a filterability apparatus. In general, the optimum dosage for maximizing filterability was higher than that for minimizing turbidity under neutral pH conditions. For a monomeric aluminum-based coagulant, the charge neutralization mechanism produced better floc characteristics, including floc growth speed and size, than the sweep flocculation mechanism. In addition, the charge neutralization mechanism showed better performance compared to sweep flocculation in terms of DOC removal and floc filterability improvement for both waters, and showed superiority in turbidity removal only when the raw water had high turbidity. For the different mechanisms, the ways that floc characteristics impacted on floc filterability also differed. The low variation in floc size distribution obtained under the charge neutralization mechanism resulted in the flocs being amenable to removal by filtration processes. For the sweep flocculation mechanism, increasing the floc size improved the settling ability of flocs, resulting in higher filter efficiency. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39518]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Xu, Zhizhen,Chow, Christopher W. K.,Fabris, Rolando,et al. Influence of coagulation mechanisms and floc formation on filterability[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2017,57(0):338-345.
APA	Xu, Zhizhen.,Chow, Christopher W. K..,Fabris, Rolando.,Jiao, Ruyuan.,Drikas, Mary.,...&Wang, Dongsheng.(2017).Influence of coagulation mechanisms and floc formation on filterability.JOURNAL OF ENVIRONMENTAL SCIENCES,57(0),338-345.
MLA	Xu, Zhizhen,et al."Influence of coagulation mechanisms and floc formation on filterability".JOURNAL OF ENVIRONMENTAL SCIENCES 57.0(2017):338-345.