Advective flow in spherical floc.
Advective flow in spherical floc.
复制标题
DOI：
10.1016/j.jcis.2007.01.023
复制
发表时间：
2007-04
影响因子：
9.9
通讯作者：
Z. Yang;X. Peng;D. J. Lee;S. Ay
中科院分区：
文献类型：
--
作者：
Z. Yang;X. Peng;D. J. Lee;S. Ay
文献中提出了许多絮体结构模型，如均匀模型或径向变化模型，用于预测平流流在絮体内传输过程中的程度。本工作利用荧光原位杂交(FISH)和激光共聚焦扫描显微镜(CLSM)技术对原生和化学絮凝后的废水絮体的三维结构进行了探索，并在此基础上构建了真实絮体结构的球形网格模型。模拟结果表明，如果关注污泥絮体的平均特性，如污泥絮体的孔隙率或阻力修正系数，均质或径向变化的模型都可以适用，特别是对于紧密压实的絮体。然而，真实絮体内部的详细流型比均匀或径向变化的模型要复杂得多。如果关注的是絮体内部的局部水动力环境，那么只有具有真实絮体的复杂结构模型才适用。
Numerous structural models of flocs, such as homogeneous model or radially-varying model, were proposed in literature for predicting the extent of advective flow on the intrafloc transport processes. This work probed the three-dimensional structure of original and chemically flocculated wastewater flocs using the fluorescence in situ hybridization (FISH) and the confocal laser scanning microscope (CLSM) techniques, from which the spherical mesh model on real floc structure was constructed. Simulation results revealed that if an average characteristic of sludge floc, such as porosity or drag force correction factor of sludge floc is of concern, both homogeneous or radially-varying models may be able to apply, particularly for those flocs that were closely compacted. However, the detailed flow patterns inside real floc are much more tortuous than those of the homogeneous or radially-varying models. If local hydrodynamic environment within the floc is of interest, then only the complicated structural model with real floc could be applicable.