曝气方式对MBR平板膜组件流体力学特征的影响.pdf

中国环境科学 2011,31(1) ：38~43 China Environmental Science 曝气方式对MBR 平板膜组件流体力学特征的影响 1,2 1,2 1* 魏 鹏 ,姚 萌 ,张凯松 (1. 中国科学院城市环境研究所,中国科学院城市环境与健康重点实验室,福建 厦 门 361021 ；2. 中国科学院研究生院,北京 100049) 摘要：以实际平板膜生物反应器为研究对象, 以自由曝气为对照,考察了在不同曝气强度(0.625,1.25,2.5,5L/min) 和不同曝气频率 (0.17,0.33,0.42,0.56,0.83Hz)下,活塞流曝气对膜表面压力及其变化系数的影响.结果表明,在试验所设范围内,当曝气频率一定时,活塞流曝气 引起的平板膜表面压力变化与强度有关;在相同曝气强度下,存在一个最佳的曝气频率范围,使活塞流曝气引起的膜表面压力最大.在相同 曝气强度下,可控制的活塞流曝气可以获得比自由曝气更佳的压力变化效果.当曝气量为2.5L/min 时,曝气频率0.33Hz 的活塞流曝气所带来 的压力系数变化高于曝气量为5.0L/min 的自由曝气. 关键词：流体力学特征；自由曝气；活塞流曝气；平板膜；膜生物反应器 中图分类号：X703.1 文献标识码：A 文章编号：1000-6923(2011)01-0038-06 Effect of aeration on hydrodynamic characteristics in flat sheet MBR. WEI Peng1,2, YAO Meng1,2, ZHANG Kai-song1* (1.Key Laboratory of Urban Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China ；2.Graduate Universityof Chinese Academy of Sciences, Beijing 100049, China). China Environmental Science, 2011,31(1)：38~43 Abstract ：The concept of gas bubbling to enhance hydrodynamic characteristics can be very effectively applied to different membrane processes, including submerged flat sheet membrane. The major current application of bubbling in membrane process is in the membrane bioreactors (MBR) using submerged membrane. However, limited data of a fundamental nature have been published for bubble interactions with submerged flat sheet membrane. In this paper, the pressure and pressure change were measured and analyzed in flat sheet MBR with free bubbling and slug bubbling respectively. The relationship between hydrodynamic characteristics and bubble properties was revealed. In particular, air flow rates(0.625, 1.25, 2.5, 5L/min) and bubble frequencies(0.17, 0.33, 0.42, 0.56, 0.83Hz) with slug bubbling co