本文运用数值模拟，研究了膜生物反应器中曝气管路布气位置及导流板对反应器内流场分布的影响，并对三种气水比（10:1、15:1、20:1）进行了优化研究。将模拟结果进行比较发现：“对齐”布气优于“间隔”布气；导流板对反应器内流场特性有较明显的影响，导流作用能有效的改善反应器内气含率的分布状况，提高氧传质效率，增大膜面剪切速度。在相同条件下，其平均膜面剪切速度分别是不加导板的1.5-1.9倍。当气水比为15:1时，各种布气方式反应器内气含率分布均较大，流场内的涡流均非常明显，整个场内形成了循环流动，膜面剪切速度也达到最大。

 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.

[1]  Polyakov Y S. Deadend out side-in hollow fiber membrane filter: mathematical model [J]. J Membr Sci, 2006, 279(1-2): 615-624.
[2]  Vargas A. Controlled backwashing in a membrane sequencing batch reactorused for toxic wastewater treatment[J]. J Membr Sci, 2008, 320(1-2): 185–190.
[3]  Clech P L, Chen V, Fane T A G.. Fouling in membrane bioreactors used in wastewater treatment[J]. J Membr Sci, 2006,284 (1-2) : 17–53.
[4]  McAdam E, Judd S J, Gildemeister R,etal. Critical analysis of submerged membrane sequencing batch reactor operating conditions[J]. Water Res, 2005,39 (16): 4011–4019.
[5]  Schoeberl P, Birk M, Bertoni M, etal. Optimization of operational parameters for a submerged membrane bioreactor treating dyehouse wastewater[J]. Sep Purif Technol, 2005,44 (1): 61–68.
[6]  Calabro V, Curcio S, Paola M G D,etal. Optimization of membrane bioreactor performances during enzymatic oxidation of waste bio-polyphenols[J].Desalination,2009, 236(1-3):30-38.
[7]   李金，王泽．浸没式超滤膜过滤器内流场的数值模拟[J]．三峡大学学报，2010，32(3)：14-17．
[8]  Brannock M, Wang Y and Leslie G. Mixing characterisation of full-scale membrane bioreactors: CFD modelling with experimental validation [J]. Water Res, 2010, 44(10): 3181-3191.
[9]  Wang Y, Brannock M, Leslie G,etal. CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using a porous media approach [J]. J Membr Sci, 2010, 363(1-2): 57-66.
[10]  王福军．计算流体力学分析—CFD软件原理与应用[M]．北京：清华大学出社，2004．
[11]  傅德熏，马延文．计算流体力学[M]．北京：高等教育出版社，2002．
[12]  谭立新，李开展，李博．平流二次沉淀池两相流二维数值模拟[J]． 西安理工大学报，2009，25(2)：197-201．
[13]  曾光明，葛卫华，秦肖生．污水厂二维沉淀池水流和悬浮物运动数值模拟[J]．中国环境科学报，2002，22( 4 )：338-341．
[14]  Taha Taha, Cheong W L, Field R W,etal. Gas-sparged ultra?ltration using horizontal and inclined tubular membranes—A CFD study [J]. J Membr Sci, 2006, 279 (1-2): 487–494.
[15]  韩杰，朱彤，黄永刚等．浸没板式膜生物反应器中流体运动的数值模拟[J]．化学与生物工程，2008，25(11)：44-47．
[16]  Li L,Qiu X Y , Sheng J. Weakly Swirling Turbulent Flow in Turbid Water Hydraulic Separation Device[J].Hydrodynamics,2008,
20(3):347-355. 
[17]  臧倩．一体式膜生物反应器曝气方式的优化比较[D]．天津：天津大学，2007：1-4．
[18]  冯民权，范术芳，郑邦民等．导流板的布置方式及其导流效果[J]．武汉大学学报，2009，42(1)：87-91．
[19]  陈威，柳溪．氧化沟中导流墙二维水流流态模拟研究[J]．环境保护工程，2011，29(1)：110-113．
 
[20]  Ren Y,Wei C H,Wu C F,etal. Gas Holdup and Liquid Circulation in an Internal Airlift Loop Reactor[J].J South China University of Technology,2002,30(3):73-76．