摘要
以研究一体式膜 -生物反应器的水动力学特性为目的 ,通过试验测定了反应器中膜间液体错流流速的分布和大小 ,建立了描述错流流速的计算模型 ,并考察了曝气量和反应器结构对错流流速的影响 .曝气量为 40 m3/h时 ,膜组件中部的错流流速为0 .36～ 0 .43m/s,比膜组件 2边的流速约大 6.2 %～ 2 1 %.错流流速实测值与模型计算值吻合良好 .曝气量为 2 0～ 50 m3/h时 ,错流流速随曝气量的升高而增大 ,当曝气量大于 50 m3/h后错流流速逐渐趋向平稳 ;反应器高度越高 ,上升流通道越窄、下降流道和底部流道越宽 ,在同样曝气量条件下 ,可获得越大的错流流速 .
In this paper,cross flow velocity along membrane surface and its distribution at different sites were experimentally measured in order to clarify the hydraulic characteristics in a submerged membrane bioreactor A simulation model for calculating the cross flow velocity was then developed Effects of aeration rate and bioreactor structure on the cross flow velocity were investigated The results showed that cross flow velocity on the middle part of the membrane module was 0 36～0 43m/s at an areation rate of 40m 3/h,about 6 2% to 21% higher than that on the sides The measured cross flow velocity was fitted well with the result calculated with the simulation model Cross flow velocity increased with aeration rate,but gradually approached a constant value when the aeration rate was higher than 50m 3/h Under the same aeration rate,a higher cross flow velocity could be achieved in a bioreactor,which has a higher height,narrower up flow channel,wider down flow channel and wider bottom passage
出处
《环境科学》
EI
CAS
CSCD
北大核心
2000年第5期47-50,共4页
Environmental Science
基金
国家"九五"科技攻关项目
关键词
膜-生物反应器
水动力学
水处理
废水处理
membrane bioreactor
cross flow velocity
aeration rate
bioreactor construction
simulation model
