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Numerical Simulation of Aeration Flow Phenomena In Bench-scale Submerged Flat Membrane Bioreactor
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.jiec.2018.09.014
Dae Chun Kim , Kun Yong Chung

Abstract The aeration rates in the membrane bioreactor is an important management-point that can reduce the maintenance costs and the membrane fouling by changing the reactor flow patterns and the shear stresses in the vicinity of the membrane surface. In the present study, COMSOL, a finite element analysis (FEA) program was used to analyze the velocity distribution, the shear stresses between the membranes and the baffle, and the shear stresses between the membranes in a system in which two flat membrane modules are installed within a bench-scale submerged flat membrane reactor for aeration at the bottom. The diameters and velocities of the bubbles that develop the velocities within the reactor were measured through image analysis and the results were applied to numerical analysis. The shear stresses between the membrane and the baffle showed relatively high values ranging from 0 Pa to 0.1 Pa at the 1/3 point from the bottom of the membrane module and showed high shear stresses in some of the top part of the membrane module too. However, the shear stresses between the membranes were formed to be lower than the shear stresses between the membranes and the baffle. This is disadvantageous to the reduction of fouling on the surfaces of the membranes where permeation fluxes exist.

中文翻译:

台式浸没式平板膜生物反应器曝气流动现象的数值模拟

摘要 膜生物反应器中的曝气率是一个重要的管理点,它可以通过改变反应器流型和膜表面附近的剪切应力来降低维护成本和膜污染。在本研究中,COMSOL,一个有限元分析 (FEA) 程序被用来分析速度分布,膜和挡板之间的剪应力,以及两个平面膜组件的系统中的膜之间的剪应力。安装在实验室规模的浸没式平板膜反应器中,用于底部曝气。通过图像分析测量在反应器内产生速度的气泡的直径和速度,并将结果应用于数值分析。在距膜组件底部 1/3 点处,膜和挡板之间的剪切应力显示出相对较高的值,范围为 0 Pa 至 0.1 Pa,并且在膜组件的某些顶部也显示出较高的剪切应力。然而,形成的膜之间的剪切应力低于膜和挡板之间的剪切应力。这不利于减少存在渗透通量的膜表面上的污垢。
更新日期:2019-01-01
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