Hydraulic optimization of membrane bioreactor via baffle modification using computational fluid dynamics

被引：35

作者：

Yan, Xiaoxu ^{[1
]}

Xiao, Kang ^{[1
,2
]}

Liang, Shuai ^{[1
]}

Lei, Ting ^{[1
]}

Liang, Peng ^{[1
]}

Xue, Tao ^{[3
]}

Yu, Kaichang ^{[3
]}

Guan, Jing ^{[3
]}

Huang, Xia ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China

[2] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China

[3] Beijing Origin Water Technol Co Ltd, Beijing 102206, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2015年 / 175卷

关键词：

Airlift membrane bioreactor; Baffle; Hydrodynamics; Membrane surface shear; Computational fluid dynamics; WASTE-WATER TREATMENT; CIRCULATION VELOCITY; SHEAR-STRESS; FLOW; SURFACE;

D O I：

10.1016/j.biortech.2014.10.133

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Baffles are a key component of an airlift membrane bioreactor (MBR), which could enhance membrane surface shear for fouling control. In order to obtain an optimal hydraulic condition of the reactor, the effects of baffle location and size were systematically explored in this study. Computational fluid dynamics (CFD) was used to investigate the hydrodynamics in a bench-scale airlift flat sheet MBR with various baffle locations and sizes. Validated simulation results showed that side baffles were more effective in elevating membrane surface shear than front baffles. The maximum average shear stress was achieved by adjusting baffle size when both front and side baffles were installed. With the optimized baffle configuration, the shear stress was 10-30% higher than that without baffles at a same aeration intensity (specific air demand per membrane area in the range of 0-0.45 m(3) m (2) h (1)). The effectiveness of baffles was particularly prominent at lower aeration intensities. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：633 / 637

页数：5

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