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曝气强度对MBR活性污泥性质和膜污染的影响
引用本文:刘阳,张捍民,夏杰,杨凤林.曝气强度对MBR活性污泥性质和膜污染的影响[J].中国科技论文在线,2008(5):314-319.
作者姓名:刘阳  张捍民  夏杰  杨凤林
作者单位:大连理工大学环境与生命学院 工业生态与环境工程教育部重点实验室,辽宁大连116024
基金项目:国家自然科学基金项目(50578024)
摘    要:本研究深入探讨了在浸没式生物膜反应器(MBR)中不同曝气强度下活性污泥性质的变化和膜污染问题。试验结果表明:MBR膜污染可分为2个阶段,运行前20dMBR-B(曝气量为0.6m3/h)的膜污染较MBR-A(曝气量为0.2m3/h)严重,而20d后MBR-A的膜污染速率高于MBR-B;曝气强度的差异导致了活性污泥粘度的不同,但污泥粘度与膜污染的相关性不显著;2个MBR污泥浓度差异很小,曝气强度对污泥浓度基本没有影响;曝气强度主要影响着结合态胞外聚合物(EPS)外层(LB-EPS)的变化,对结合态EPS内层(TB-EPS)的影响较小,LB-EPS和蛋白质类LB在整个运行期间与膜污染速率呈现显著正相关,蛋白质是膜污染的主要污染物。

关 键 词:环境工程学  膜污染  曝气  MBR  结合态EPS外层(LB-EPS)  结合态EPS内层(TB-EPS)

Effect of aeration on characteristics of the activated sludge and membrane fouling in a submerged membrane bioreactor
LIU Yang,ZHANG Hanmin,XIA Jie,YANG Fenglin.Effect of aeration on characteristics of the activated sludge and membrane fouling in a submerged membrane bioreactor[J].Sciencepaper Online,2008(5):314-319.
Authors:LIU Yang  ZHANG Hanmin  XIA Jie  YANG Fenglin
Institution:(Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental & Biological Science & Technology, Dalian University of Technology, Dalian, Liaoning 116024)
Abstract:Laboratory experiments on submerged MBR were carried out to investigate the influence of aeration on characteristics of the activated sludge and membrane fouling. Results showed that membrane fouling included 2 stages under different level of aeration, with the membrane fouling rate of MBR-B (0.6 m3/h of aeration ) higher than MBR-A (0.2 m3/h of aeration) in Stage 1 of the first 20 d, and lower in Stage 2 after 20 d. Different aeration led to viscosity discrepancy, which however didn’t show clear relationship with membrane fouling. It was found that mixed liquid suspended solids(MLSS)was no different in 2 MBRs, i.e., aeration didn’t play an important role on MLSS. The influence of aeration was important on loosely bound extracellular polymeric substances(LB-EPS) but not on tightly bound EPS (TB-EPS). LB-EPS and LB protein had strong positive effect on membrane fouling, which indicated that protein was the major pollutants.
Keywords:environmental engineering  membrane fouling  aeration  MBR  loosely bound EPS  tightly bound EPS
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