基于CFD的大型膜生物反应器的设计及运行优化  

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

作　　者：柳蒙蒙[1,2] 陈梅雪 杨敏[1,2] 郁达伟[1,2] 郑嘉熹 魏源送[1] 冀春苗 王晓爽[3] 常江 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]中国科学院大学,北京100049 [3]北京排水集团科技研发中心,北京100022

出　　处：《环境工程学报》2018年第2期552-558,共7页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2015ZX07203-005);国家自然科学基金资助项目(21777161;41501513;21777161);国家重点研发计划(2016YFE0118500)

摘　　要：基于计算流体力学(CFD)方法,使用Eulerian多相流模型,对500 m^3·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。Based on the computational fluid dynamics method,the Eulerian multiphase flow model was used to simulate the 500 m^3· d^-1 aerobic MBR and optimize its arrangement of aerators and four gas-water ratios（10 ∶ 1,15 ∶ 1,20 ∶ 1,25 ∶ 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 gaswater 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.

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 

分 类 号：X703[环境科学与工程—环境工程]