Reynolds number-dependent permeability of wastewater sludge flocs |
| |
Authors: | Zeng Yang Xiao-Feng Peng Duu-Jong Lee Ay Su |
| |
Affiliation: | 1. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;2. Chemical Engineering Department, National Taiwan University, Taipei 10617, Taiwan;3. Department of Mechanical Engineering & Fuel Cells Research Center, Yuan Ze University, Chungli 320, Taiwan |
| |
Abstract: | Most theoretical models assume constant permeability of wastewater sludge floc. This work shows that, at creeping flow limit with small intrafloc Reynolds number, the permeability of floc can not only be affected by floc structure, but also by the external flow condition. The three-dimensional structure of flocs using the fluorescence in situ hybridization (FISH) and the confocal laser scanning microscope (CLSM) was firstly probed. Then, the volumetric grid models for sludge flocs were constructed. We noted that the floc permeability could keep unchanged, increased, or decreased at increased Reynolds number (Re). Flow redistribution among channels of various sizes contributes to the noted Re-dependent permeability of flocs. |
| |
Keywords: | Floc model CLSM Permeability Flow distribution |
本文献已被 ScienceDirect 等数据库收录! |
|