Hydrodynamic optimization of membrane bioreactor by horizontal geometry modification using computational fluid dynamics

被引：34
作者：
Yan, Xiaoxu [1 ]
Wu, Qing [1 ]
Sun, Jianyu [1 ]
Liang, Peng [1 ]
Zhang, Xiaoyuan [1 ]
Xiao, Kang [2 ]
Huang, Xia [1 ]
机构：
[1] Tsinghua Univ, Sch Environm, THU Beijing Origin Water Joint Res Ctr Environm M, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
[2] Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100049, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2016年 / 200卷
关键词：
Membrane bioreactor; Hydrodynamics; Geometry optimization; Computational fluid dynamics; Membrane surface shear; WASTE-WATER TREATMENT; FLOW; SHEAR; SURFACE;
D O I：
10.1016/j.biortech.2015.10.050
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Geometry property would affect the hydrodynamics of membrane bioreactor (MBR), which was directly related to membrane fouling rate. The simulation of a bench-scale MBR by computational fluid dynamics (CFD) showed that the shear stress on membrane surface could be elevated by 74% if the membrane was sandwiched between two baffles (baffled MBR), compared with that without baffles (unbaffled MBR). The effects of horizontal geometry characteristics of a bench-scale membrane tank were discussed (riser length index L-r, downcomer length index L-d, tank width index W-t). Simulation results indicated that the average cross flow of the riser was negatively correlated to the ratio of riser and downcomer cross-sectional area. A relatively small tank width would also be preferable in promoting shear stress on membrane surface. The optimized MBR had a shear elevation of 21.3-91.4% compared with unbaffled MBR under same aeration intensity. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：328 / 334
页数：7
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