Floc characteristics of titanium tetrachloride (TiCl4) compared with aluminum and iron salts in humic acid-kaolin synthetic water treatment
Floc characteristics of titanium tetrachloride (TiCl4) compared with aluminum and iron salts in humic acid-kaolin synthetic water treatment
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DOI：
10.1016/j.seppur.2011.07.041
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发表时间：
2011-10-10
影响因子：
8.6
通讯作者：
Wang, Y.
中科院分区：
文献类型：
--
作者：
Zhao, Y. X.;Gao, B. Y.;Wang, Y.
使用腐殖酸-高岭土合成水样对TiCl4、FeCl3和Al-2(SO4)(3)的絮体强度和再生长性能进行了比较评价。在给定的最佳剂量（Ti 为 20 mg/L、Fe 为 8 mg/L、Al 为 2 mg/L）下，使用激光衍射粒度仪研究了 TiCl4、FeCl3 和 Al-2(SO4)(3) 的絮体生长、破碎和再生长。进行罐式试验以研究剪切力和破碎时间对絮体破碎和重新聚集潜力的影响。结果表明，絮体对增加的剪切力和破碎时间的响应取决于所使用的混凝剂。絮体抵抗破碎的能力随着剪切力的增大而降低。还测量了随剪切力增加而产生的絮体强度特性，结果表明絮体强度的顺序为 TiCl4 > FeCl3 > Al-2(SO4)(3)。这三种混凝剂在高剪切后的絮体再生长受到限制，而 TiCl4 形成的絮体表现出最弱的可恢复性。当断裂时间不同时，得到类似的结果。 (C) 2011 Elsevier B.V. 保留所有权利。
The floc strength and regrowth properties of TiCl4, FeCl3, and Al-2(SO4)(3) were comparatively evaluated using humic acid-kaolin synthetic water sample. At the given optimum dosage (20 mg/L as Ti, 8 mg/L as Fe, and 2 mg/L as Al, respectively), the floc growth, breakage and regrowth of TiCl4, FeCl3, and Al-2(SO4)(3) were investigated by use of a laser diffraction particle sizing device. Jar tests were conducted to investigate the impact of shear force and breakage period on floc breakage and re-aggregation potential. Results indicated that the responses of flocs to increasing shear force and breakage period depend on the coagulant used. The ability of floc to resist breakage decreased with the increase of shear force. Floc strength properties were also measured in response to increasing shear force, with the results suggesting that the order of floc strength was TiCl4 > FeCl3 > Al-2(SO4)(3). Floc regrowth of these three coagulants after exposure to high shear was limited, and flocs formed by TiCl4 displayed the weakest recoverability. Similar results were obtained when breakage period was different. (C) 2011 Elsevier B.V. All rights reserved.