Optimized coagulation pathway of Al-13: Effect of in-situ Aggregation of Al-1(3)

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	Optimized coagulation pathway of Al-13: Effect of in-situ Aggregation of Al-1(3)
	Wang, Pin ; Jiao, Ruyuan ; Liu, Libing ; Xiao, Feng ; An, Guangyu ; Wang, Dongsheng
刊名	CHEMOSPHERE
	2019-09-01
卷号	230 页码:76-83
关键词	Al-13 Aggregation Particle coagulation Flocs Mechanism
ISSN号	0045-6535
英文摘要	The coagulation mechanism for removing particles by Al-13 has been extensively investigated for water treatments. It was widely accepted that Al-13 played important roles in coagulation mainly by charge neutralization and electrostatic patch. However, the discovery of Al(13 )aggregates (Al(13)agg) in flocs indicated that the real coagulation process should be different from the previous understanding, including when (Al(1)(3)agg) were generated and how it interacted with negative particles. The aggregation process of Al-13 during coagulation and its micro-interfacial effect on particle coagulation remains to be explored. In this study, to investigate the aggregation of Al(13 )and its effect on coagulation performance, two parallel coagulation jar tests were conducted on silica suspensions by preformed Al(13)agg and Al-13, respectively. The results showed that optimized coagulation for particle removal by Al-13 occurred from pH 7 to pH 9, which was dominated by the in-situ aggregation of Al-13. The results confirmed that Al(13)aggwere both present in flocs generated in two tests, however, the morphology and distribution of surface Al of flocs were different for two tests. The in-situ formed Al(13)aggcovered all over the silica particles in flocs, resulting in compact structure with rough surfaces, while the preformed Al(13)agg mainly distributed on joint sites between particles, generating denser flocs with smooth surfaces. This difference verified that the in-situ aggregation of Al(13)was the key factor to optimized particle coagulation. The overall optimized particle coagulation by Al-13 should undergo the following pathway: charge neutralization - in-situ aggregation of Al-13- inter-particle bridging. (C) 2019 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42663]
专题	生态环境研究中心_环境水质学国家重点实验室
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Pin,Jiao, Ruyuan,Liu, Libing,et al. Optimized coagulation pathway of Al-13: Effect of in-situ Aggregation of Al-1(3)[J]. CHEMOSPHERE,2019,230:76-83.
APA	Wang, Pin,Jiao, Ruyuan,Liu, Libing,Xiao, Feng,An, Guangyu,&Wang, Dongsheng.(2019).Optimized coagulation pathway of Al-13: Effect of in-situ Aggregation of Al-1(3).CHEMOSPHERE,230,76-83.
MLA	Wang, Pin,et al."Optimized coagulation pathway of Al-13: Effect of in-situ Aggregation of Al-1(3)".CHEMOSPHERE 230(2019):76-83.