Distinct mechanisms of particle aggregation induced by alum and PACl: Floc structure and DLVO evaluation
文献类型：会议论文
| 作者 | Wu, Xiaohong; Ge, Xiaopeng; Wang, Dongsheng; Tang, Hongxiao |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：生态环境研究中心
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