Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

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

	Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage
	Wei, Ning; Zhang, Zhongguo; Liu, Dan; Wu, Yue; Wang, Jun; Wang, Qunhui
刊名	CHINESE JOURNAL OF CHEMICAL ENGINEERING
	2015-06
卷号	23 期号:6 页码:1041-1046
关键词	Separation Coagulation Aggregation Precipitation Charge neutralization Sweep flocculation Polyaluminum chloride
英文摘要	Coagulation mechanisms of polyaluminum chloride (PACl) at various dosages were studied using a conventional jar test at different final and initial pH values during treating kaolin suspension. The optimal final pH and dosages for PACl were obtained based on residual turbidity and zeta potential of flocs. The coagulation zones at various PACl dosages and solution pH values were developed and compared with those of alum. It is found that the optimal mechanism under acidic condition is charge neutralization, while alkaline condition will facilitate the coagulation of PACl. Both charge neutralization coagulation and sweep coagulation can achieve high coagulation efficiency under the alkaline condition ranging from final pH 7.0 to 10.0. Stabilization, charge neutralization destabilization, restabilization and sweep zones occur successively with increasing PACl dosages with the final pH values fixed at 7.0 and 8.0, but restabilization zone disappears at final pH 10.0. When the final pH is not controlled and consequently decreases with increasing PACl dosage, no typical sweep zone can be observed and the coagulant efficiency decreases at high PACl dosage. It seems that the final pH is more meaningful than the initial pH for coagulation. Charge neutralization coagulation efficiency is dominated by zeta potential of flocs and PACl precipitates. The charge neutralization and sweep coagulation zones of PACl are broader in the ranges of coagulant dosage and pH than those of alum. The results are helpful for us to treat water andwastewater using PACl and to understand the coagulation process of PACl. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
研究领域[WOS]	Engineering, Chemical
WOS记录号	WOS:000356310000021
公开日期	2016-03-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32741]
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	Wei, Ning,Zhang, Zhongguo,Liu, Dan,et al. Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2015,23(6):1041-1046.
APA	Wei, Ning,Zhang, Zhongguo,Liu, Dan,Wu, Yue,Wang, Jun,&Wang, Qunhui.(2015).Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage.CHINESE JOURNAL OF CHEMICAL ENGINEERING,23(6),1041-1046.
MLA	Wei, Ning,et al."Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage".CHINESE JOURNAL OF CHEMICAL ENGINEERING 23.6(2015):1041-1046.