文献类型：期刊文献

英文题名：Computational fluid dynamics simulation as a tool for optimizing the hydrodynamic performance of membrane bioreactors

作者：Jin, Yan[1];Liu, Cheng-Lin[1,2];Song, Xing-Fu[1,2];Yu, Jian-Guo[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Resource Proc Engn Res Ctr, Shanghai, Peoples R China

年份：2019

卷号：9

期号：55

起止页码：32034

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20194207552490);WOS:【SCI-EXPANDED(收录号:WOS:000490133300028)】；

基金：We acknowledge the financial support provided by the National Natural Science Foundation of China (Grant 21206038).

语种：英文

外文关键词：Hydrodynamics - Membrane fouling - Shear stress - Shear flow - Computational fluid dynamics - Membranes

摘要：The hydrodynamic properties and shear stresses experienced by a membrane bioreactor (MBR) are directly related to its rate of membrane fouling. In this study, computational fluid dynamic models have been combined with cold model PIV experimental studies to optimize the performance properties of MBRs. The effects of membrane module height, number of aeration tubes and membrane spacing on liquid phase flow rates, gas holdup and shear stresses at the membrane surface have been investigated. It has been found that optimal MBRs experience the greatest shear forces on their surfaces at a distance of 250 mm from the aeration tube, around the 7 aeration tubes used to introduce gas and at the 40 mm spacings between the membrane sheets. Use of an aeration intensity of between 0.02 and 0.47 m(3) min(-1) generated shear stresses that were 50-85% higher than the original MBR for the same aeration intensity, thus affording optimal membrane performance that minimizes membrane fouling.