Characterization of floc size, strength and structure under various coagulation mechanisms
Characterization of floc size, strength and structure under various coagulation mechanisms
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各种混凝机制下絮体尺寸、强度和结构的表征
DOI：
10.1016/j.powtec.2006.07.003
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发表时间：
2006-10-11
影响因子：
5.2
通讯作者：
Tang, Hongxiao
中科院分区：
文献类型：
--
作者：
Li, Tao;Zhu, Zhe;Tang, Hongxiao
不同的混凝机理产生的絮体具有不同的尺寸、强度和结构。研究了不同水力条件下电中和、扫动和架桥三种常见混凝机理下形成的絮体的性质和分形维数。结果表明，絮体粒径随平均速度梯度G的增大而减小，絮体稳定粒径指数T的大小顺序为：电中和（0.6107）>扫动（0.5618）>架桥（0.3674）。此外，絮体的分形维数最高时，形成的扫描和最低时，产生的桥接絮凝。光散射法测得的质量分形维数在2.0 ~ 3.0之间，絮体强度在0.01 ~ 0.58Nm（-2）之间。结果表明，在三种混凝机理下，絮体粒径、分形维数和絮体强度之间的关系是内在统一的。(c)2006 Elsevier B. V.保留所有权利。
Flocs generated by various coagulation mechanisms exhibit different size, strength and structure. The properties and fractal dimensions of flocs formed under three common coagulation mechanisms, i.e. charge neutralization, sweep and bridging, were investigated at various hydraulic conditions. The results showed that the floc size decreased with the increasing average velocity gradient G and the stable floc size exponent T was of the following hierarchy: charge neutralization (0.6107)> sweep (0.5618) > bridging (0.3674). Furthermore, fractal dimensions of flocs were the highest when formed by sweep and the lowest when generated by bridging flocculation. The mass fractal dimensions measured by light scattering were between 2.0 and 3.0 and the floc strength was between 0.01 and 0.58 N m(-2). An intrinsic unity of the relationship among floc size, fractal dimensions, floc strength under the three coagulation mechanisms was demonstrated. (c) 2006 Elsevier B.V. All rights reserved.