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The Effect of the diversion and Aeration Mode on the Internal Flow Field of Membrane Bioreactor by Numerical Simulation

Authors：
Luo nan1, Wang jie 1,2*, Jia Hui2, Geng Quan Yue1

Units： 1.School of Material Science and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300160,China ; 2.Key laboratory of Hollow Fiber of Membrane Material and Membrane Process of Ministry of Education, Tianjin Polytechnic University, Tianjin 300160, China;

KeyWords： membrane bioreactor; numerical simulation; diversion aeration; membrane fouling

ClassificationCode：

year,volume(issue):pagination： 2012,32(4):54-60

Abstract：

Applying two-dimensional computational fluid dinamics simulation in this paper, the effect of the location of the aeration pipeline and the deflector on the mixture of air and water within the flow field in membrane bioreactor were studied and three kinds of gas-water ratio (10:1, 15:1, 20:1) were optimized. Through analysis and comparison, it is shown that the "alignment" gas distribution better than "interval"; The deflector has a obvious effect on the flow field in the reactor,it can effectively improve the reactor gas holdup distribution and the oxygen transfer efficiency, increasing membrane surface rate . The average shear rate were 1.5 ~ 1.9 times higher than that without baffles under the same condition. And when the gas-water ratio is 15:1, the gas holdup distribution of all kinds of ways are large, the vortex in the flow field are very obvious, a circular flow can form in the whole field,the membrane surface rate is the highest.

Funds：

国家自然科学青年基金（50908161），973前期研究专项（2011CB612311），国家水体污染控制与治理科技重大专项（2008ZX07314-003）作者简介：

AuthorIntro：

罗南（1987-），女，湖南衡阳人，硕士研究生，主要从事膜应用方面的研究工作。

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