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Simulation and optimization of airlift external circulation membrane bioreactorusing CFD

Authors： ZHANG Qing, FAN Yaobo*, WEI Yuansong, YU Dawei, XU Rongle

Units： Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085

KeyWords： computational fluid dynamic; airlift external circulation membrane bioreactor; configuration optimization; sensitivity analysis; membrane fouling control

ClassificationCode：

year,volume(issue):pagination： 2013,33(4):107-119

Abstract：

Simulation and optimization of airlift external circulation membrane bioreactor (AL EC MBR) was performed using computational fluid dynamics (CFD) in this paper. Four cases of MBRs withdifferent configurat- ions were simulated and the sensitivity analysis of their impacts on the velocity, shear stress, circulation rate of mixture in the MBRwere presented. The results showedthat larger distance from diffusers to membrane modules(height of gas-liquid mixing zone)was helpful to improvethe velocity and shear stress at the membrane surfaces for membrane fouling control;the distribution of shear stress at the membrane surface in the membrane tank with 3 diffusers wasmore uniformthan that with2 diffusers;higher position of the diffusers wouldresult inmore fluid dead zones under the diffusers in the membrane tank.It was also notedthat higher viscosityof the mixture in the
MBR will lower the circulation rate between the membrane unit and the aeration tank, but on the contrary,the distribution of air-liquidflowingover the membrane surfaces appeared moreuniform.However, the fluid velocity and wall shear stress are always higher at the centralsheets and much lower at the side ones in membranemodule.Thenon-uniformity of gas-liquid flow though the channelsbetween the membrane sheets isone major reason to lose effectivefiltration area of membranes,to lose productivity of treated water and to result in high energy consumptionforMBR application.

Funds：

国家自然科学基金“MBR 流场、传质与能耗的相互关系研究”（51278483)，环境模拟与污染控制国家重点联合实验室（环境水质学实验室）课题“计算流体力学（CFD）及其在膜生物反应器技术创新中的应用研究”。

AuthorIntro：

张晴（1987—），女，湖南湘潭，硕士生，研究方向为计算流体力学（CFD）在膜生物反应器（MBR）中的研究应用。E-mail: zhangqing210@mails.gucas.ac.cn。*通讯作者，E-mail: ybfan@rcees.ac.cn

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