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	Distinct mechanisms of particle aggregation induced by alum and PACl: Floc structure and DLVO evaluation
	Wu, Xiaohong; Ge, Xiaopeng; Wang, Dongsheng; Tang, Hongxiao
	2009
会议名称	5th International Conference on Interfaces Against Pollution
会议日期	JUN 01-04, 2008
会议地点	Kyoto, JAPAN
关键词	Particle aggregation Alum PACl DLVO Coagulation
英文摘要	Interactions of silica microspheres were examined by light scattering in presence of alum and polyaluminum chloride (PACl) with various OH/Al ratios. The coagulation behaviors were investigated using different coagulant dosages at constant pH (6.5) and salt concentration (0.01 mol/L). Based on the measurement of size distribution and zeta potential, charge neutralization was proposed to be the primary coagulation step for all the coagulants while other distinct coagulation steps were also involved depending on in situ formed or preformed hydrolyzing products. Precipitate coverage and sweep flocculation were induced for alum, contrasted to polycation patch and bridge aggregation for PACl. Based on simplified DLVO theory, particle aggregation was explained in terms of interaction forces. It was demonstrated that PACl outperformed alum in particle agglomeration at lower concentration (1-2 mu mol/L), owing mainly to the considerable energy barrier reduction and deeper secondary minimum at longer distance induced by high positive polycations. The role of secondary minimum was found to be significant when secondary depth exceeded 12 kT. The interaction energy calculations coincided well with coagulation result for PACI, especially PACl22 with high content Al(13). However, other interaction forces prevailed over the electrical repulsion for alum and PACl containing other aluminum species. (C) 2008 Elsevier B.V. All rights reserved.
ISSN号	0927-7757
WOS记录号	WOS:000270164800010
内容类型	会议论文
源URL	[http://ir.rcees.ac.cn/handle/311016/24676]
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	Wu, Xiaohong,Ge, Xiaopeng,Wang, Dongsheng,et al. Distinct mechanisms of particle aggregation induced by alum and PACl: Floc structure and DLVO evaluation[C]. 见:5th International Conference on Interfaces Against Pollution. Kyoto, JAPAN. JUN 01-04, 2008.

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