Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China.
Water Res. 2010 Mar;44(6):1893-9. doi: 10.1016/j.watres.2009.11.029. Epub 2009 Dec 11.
The breakage and re-growth of flocs formed by polyaluminum chloride (PAC) and the Al(13)O(4) (OH)(24)(7+) (Al(13) for short) polymer were comparatively evaluated for the coagulation of humic acid (HA). A series of jar experiments were conducted to investigate the impacts of shear rate and solution pH on flocs breakage and re-aggregation potential. Results indicated that the responses of flocs to the increasing shear force and solution pH depend on the coagulant used. The ability of flocs to resist breakage decreased with the increasing shear rate. For all levels of shear force investigated in this study, the flocs formed by Al(13) polymer were weaker than those of PAC, whereas Al(13) polymer displayed a better recoverability than PAC. The similar results were obtained when pH of solution was changed. The flocs generated in acidic conditions were stronger and more recoverable than those generated in alkaline conditions no matter which coagulant was used.
比较了聚合氯化铝 (PAC) 和 Al(13)O(4) (OH)(24)(7+) (简称 Al(13)) 聚合物形成的絮体的破碎和再生长，以评估其对腐殖酸 (HA) 的混凝效果。进行了一系列的烧杯实验，以研究剪切速率和溶液 pH 值对絮体破碎和再聚集潜力的影响。结果表明，絮体对不断增加的剪切力和溶液 pH 值的响应取决于所用的混凝剂。随着剪切速率的增加，絮体抵抗破碎的能力降低。对于本研究中考察的所有剪切力水平，Al(13)聚合物形成的絮体比 PAC 形成的絮体弱，但 Al(13)聚合物的恢复能力比 PAC 好。当溶液 pH 值发生变化时，得到了类似的结果。无论使用哪种混凝剂，在酸性条件下生成的絮体比在碱性条件下生成的絮体更强且更具恢复能力。
