膜内气压和液相流速对无泡膜曝气氧传质性能的影响  

Effects of Intra-membrane Air Pressure and Liquid Velocity on Oxygen Transfer Performance in Bubbleless Membrane Aeration Reactor

作　　者：王荣昌[1,2] 王小燕[1,2] 肖帆[1,2] WANG Rong-chang WANG Xiao-yan XIAO Fan(Key Laboratory of Yangtze Aquatic Environment 〈 Ministry of Education 〉, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China State Key Laboratory of Pollution Control and Resource Reuse, Institute of Biofilm Technology, Tongji University, Shanghai 200092, China)

机构地区：[1]同济大学环境科学与工程学院长江水环境教育部重点实验室,上海200092 [2]同济大学生物膜技术研究所污染控制与资源化研究国家重点实验室,上海200092

出　　处：《中国给水排水》2016年第23期68-71,75,共5页China Water & Wastewater

基　　金：国家重点研发计划课题(2016YFC0400805)

摘　　要：探究了膜内气压（P）及液相流速对无泡膜曝气氧传质性能的影响。结果表明，当P在2kPa以下时，随着P增加，氧传质系数增加；当P为2～10kPa时，随着P增加，氧传质系数逐渐降低。当液相流速从0．014m／s增加到0．041m／s时，氧传质系数呈上升趋势，但增加幅度不大。同时给出了膜曝气反应器内舍伍德数（Sh）随膜内气压、雷诺数（Re）和施密特数（So）的变化关系式，当P为0～2kPa时，跏与P呈正相关，说明氧传质性能随压强的升高而增强；当P为2～10kPa时，肌与P呈负相关，说明此时氧传质性能随压强的升高而减弱。The effects of intra-membrane air pressure （P） and liquid velocity on oxygen transfer performance were investigated in a bubbleless membrane aeration reactor. The results showed that oxygen transfer coefficient increased when P was below 2 kPa, but oxygen transfer coefficient decreased when P increased from 2 to 10 kPa. Oxygen transfer coefficient increased slightly when liquid velocity increased from 0.014 m/s to 0.041 m/s. The relationships of Sherwood number （Sh） to intra-membrane air pres- sure, Reynolds number （Re） and Schmidt number （Sc） in the bubbleless membrane aeration reactor were presented. Sh was positively correlated to P when P increased from 0 to 2 kPa, indicating that the oxygen transfer performance was enhanced with the increase of the pressure. Sh was negatively correlated to P when P increased from 2 to 10 kPa, indicating that the oxygen transfer performance was weakened with the increase of the pressure.

关 键 词：无泡膜曝气 膜内气压 液相流速 氧传质系数 舍伍德数 

分 类 号：X703[环境科学与工程—环境工程]