Hydrolysis of polyaluminum chloride prior to coagulation: Effects on coagulation behavior and implications for improving coagulation performance

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

	Hydrolysis of polyaluminum chloride prior to coagulation: Effects on coagulation behavior and implications for improving coagulation performance
	Zhang, Zhongguo; Wang, Jun; Liu, Dan; Li, Jiuyi; Wang, Xiaolin; Song, Boyu; Yue, Bing; Zhao, Kehui; Song, Yun
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2017-07-01
卷号	57 期号:0 页码:162-169
关键词	Polyaluminum Chloride (Pacl) Precipitate Hydrolysis Charge Neutralization Sweep Coagulation
英文摘要	The effects of polyaluminum chloride (PACl) hydrolysis prior to coagulation on both the coagulation zone and coagulation performance of a kaolin suspension were investigated by a novel jar test named the "reversed coagulation test". The tests showed that PACl hydrolysis prior to coagulation decreased the performance of charge neutralization coagulation in the case of short-time slow mixing (10 min; G = 15 sec(-1)) and increased the optimal dosage for charge neutralization and sweep coagulation. Moreover, the hydrolysis time had insignificant effects on the size and zeta potential of PACT precipitates and the residual turbidity of the raw water. However, PACT hydrolysis prior to coagulation and the size of PACT precipitates had a negligible effect on the performance of sweep coagulation. The results imply that, in practice, preparing a PACl solution with deionized water, rather than tap water or the outlet water from a wastewater treatment unit, can significantly save PACT consumption and improve the performance of charge neutralization coagulation, while preparing the PACl solution with tap or outlet water would not affect the performance of sweep coagulation. In addition, the optimal rapid mixing intensity appears to be determined by a balance between the degree of coagulant hydrolysis before contacting the primary particles and the average size of flocs in the rapid mixing period. These results provide new insights into the role of PACT hydrolysis and will be useful for improving coagulation efficiency. (C) 2016 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/311016/39513]
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	Zhang, Zhongguo,Wang, Jun,Liu, Dan,et al. Hydrolysis of polyaluminum chloride prior to coagulation: Effects on coagulation behavior and implications for improving coagulation performance[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2017,57(0):162-169.
APA	Zhang, Zhongguo.,Wang, Jun.,Liu, Dan.,Li, Jiuyi.,Wang, Xiaolin.,...&Song, Yun.(2017).Hydrolysis of polyaluminum chloride prior to coagulation: Effects on coagulation behavior and implications for improving coagulation performance.JOURNAL OF ENVIRONMENTAL SCIENCES,57(0),162-169.
MLA	Zhang, Zhongguo,et al."Hydrolysis of polyaluminum chloride prior to coagulation: Effects on coagulation behavior and implications for improving coagulation performance".JOURNAL OF ENVIRONMENTAL SCIENCES 57.0(2017):162-169.