標題: Coagulation behavior of Al-13 aggregates
作者: Lin, Jr-Lin
Chin, Ching-Ju M.
Huang, Chihpin
Pan, Jill R.
Wang, Dongsheng
環境工程研究所
生物科技學系
Institute of Environmental Engineering
Department of Biological Science and Technology
關鍵字: PACl;Coagulation;Al-13 aggregates;Kaolin;Fractal dimension
公開日期: 1-Oct-2008
摘要: The coagulation behavior of Al-13 aggregates formed in coagulation of kaolin was investigated by small angle static light scattering (SASLS), solid-state Al-27 NMR and tapping mode atomic force microscope (TM-AFM). A kaolin suspension was coagulated by PACl containing high content of Al-13 polycation (PACl-Al-13). The results indicated that Al-13 was predominant in destabilizing kaolin particles for PACl-Al-13 coagulation even though at alkaline pH (pH 10). At such high pH, Al-13 aggregates were observed when the dosage of PACl-Al-13 was increased. In addition, the mechanism of coagulation by PACl-Al-13 at alkaline pH was affected by dosage. When the dosage was insufficient, coagulation was caused by electrostatic patch, which led to compact flocs with high fractal dimension (D-f) Interparticle bridging dominated the coagulation when the coagulant dosage approached the plateau of adsorption, which caused the looser flocs with low Df. The in-situ AFM scanning in liquid system proved that the existence of linear A113 aggregates composed of a chain of coiled Al-13 in coagulation by PACl-Al-13 at a high dosage and alkaline pH. Meanwhile, several coiled Al-13 aggregates with various dimensions were observed at such condition. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.watres.2008.07.028
http://hdl.handle.net/11536/8291
ISSN: 0043-1354
DOI: 10.1016/j.watres.2008.07.028
期刊: WATER RESEARCH
Volume: 42
Issue: 16
起始頁: 4281
結束頁: 4290
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