基于CFD的大型膜生物反应器的设计及运行优化

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Design and operation optimization on full-scale membrane bioreactor using CFD

LIU Mengmeng^1,2,,
CHEN Meixue¹,
YANG Min^1,2,
YU Dawei^1,2,
ZHENG Jiaxi^1,2,
WEI Yuansong¹,
JI Chunmiao³,
WANG Xiaoshuang³,
CHANG Jiang³
1.Research Center for Eco-Environment Science, Chinese Academy of Sciences, Beijing 100085, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Center of Technology Development, Beijing Drainage Group Co.Ltd., Beijing 100022, China

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摘要:基于计算流体力学(CFD)方法,使用Eulerian多相流模型,对500 m3·d-1的膜生物反应器中曝气管布置方式以及4种气水比(10∶1、15∶1、20∶1和25∶1)进行优化研究,通过对不同反应器构型内部流场、速度场和膜面液体流速进行分析比较,同时借助停留时间分布(RTD)实验对模拟结果进行实验验证。结果表明:曝气管“对齐”布置方式优于“间隔”和“垂直”布置；考虑膜面冲刷以及能耗方面,确定最佳气水比为20∶1,此时反应器内形成了循环流动,膜面冲刷效果比较好,低速区占比较小,对降低膜污染有很好的作用。
关键词: 膜生物反应器/
计算流体力学/
流场模拟/
优化曝气/
膜污染

Abstract:Based on the computational fluid dynamics method, the Eulerian multiphase flow model was used to simulate the 500 m3·d-1 aerobic MBR and optimize its arrangement of aerators and four gas-water ratios (10∶1,15∶1,0∶1,5∶1). The internal flow field, velocity field and membrane velocity of different reactor configurations were analyzed and compared, and the simulation results were verified by means of residence time distribution (RTD).The results show that the “alignment” arrangement of the aeration pipe is better than that of “interval” and “vertical”. Considering the membrane surface erosion and energy consumption, the optimum gas-water ratio is 20∶1. In this operation status, the reactor flow, membrane erosion effect is better, and low-speed area accounted for relatively small, which has a good effect to reduce membrane pollution.
Key words:membrane bioreactor (MBR)/
computational fluid dynamics (CFD)/
flow field simulation/
optimization of aeration/
membrane fouling.

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刊出日期:2018-02-08

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