Membrane Science and Technology

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Hydraulic research of H circulating pipe in airlift external circulation membrane bioreactor

Authors： ZHANG Qing, FAN Yaobo*, XU Rongle

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

KeyWords： airlift external circulation membrane bioreactor, H circulating pipe, computational fluid dynamics

ClassificationCode：X703.1

year,volume(issue):pagination： 2014, 34(1):39-45

Abstract：

In this study, computational fluid dynamics (CFD) was implemented to study the hydrodynamic characteristics of H circulating pipe in airlift external circulation membrane bioreactor (AEC-MBR). The role of H circulating pipe and the effect of different diameters of H circulating pipe on circulation were modeled and analyzed. Furthermore, formula of circulation flow velocity in H circulating pipe was deduced. The results showed that H circulating pipe was necessary and played an important role in the AEC-MBR, and that an increase in the diameter of H circulating pipe led to an increase in the mass flow rate between the membrane unit and the aeration tank. The mean flow velocity in H circulating pipe reached a maximum when D/L=22.2%. An equation was derived for determining the velocity of the circulation flow in the H circulating pipe as U=1/n R^(2/3) [(H_0/l)(Q_a1/(v_1 A_1 )-Q_a2/(v_2 A_2 )) ]^(1/2).The results and research method provide by this paper can be used as a reference for further hydraulic study of MBR.

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）中的应用研究。E-mail: zhangqing210@mails.gucas.ac.cn。*通讯作者，E-mail: ybfan@rcees.ac.cn

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