摘要
采用外压管式聚砜－聚丙烯腈共混超滤膜进行错流膜生物反应器水力清洗特性研究．结果表明：清洗时采用高膜面流速、低操作压力和限制透过液对流传递作用有利于错流膜生物反应器通量的恢复，这符合膜污染形成和去除过程中的传质机理；适宜的膜面流速应稍大于临界流速ｖｋ＝１．９２ｍ／ｓ，清洗时间应控制在１０ｍｉｎ，适宜的清洗操作压力为０．０７ＭＰａ．
The external pressure tubular moduel and PS PAN blended membranes were used in the study on the characteristics of hydraulic cleaning in crossflow membrane bioreactor.It was demonstrated that low trans membrane pressure and high velocities along membrane surface played an important role in removing the fouling layer and so did the elimination of the effect of the convective transport to membrane because the pressure differences across the membrane were reduced to zero.Considerations of the mechanism of mass transfer in the formation and elimination of the membrane fouling furtherly supported these cleaning conditions.The cleaning operation parameters were obtained at crossflow velocity a little more than v k=1 92m/s which was the critical velocity,cleaning time about 10min,trans membrane about 0.07MPa.
出处
《环境科学》
EI
CAS
CSCD
北大核心
1999年第2期57-60,共4页
Environmental Science
基金
铁道部青年科学基金
关键词
膜生物反应器
错流
膜污染
水力清洗
传质机理
membrane bioreactor,crossflow,membrane fouling,hydraulic cleaning,mechanism of mass transfer.
