曝气强度对膜生物反应器运行特性的影响  

Effect of aeration intensity on operating characteristics of membrane bioreactors

作　　者：张君[1] 李秀芬[1] 王新华[1] 潘丹云[1] 

机构地区：[1]江南大学环境与土木工程学院,无锡214122

出　　处：《环境化学》2012年第1期82-87,共6页Environmental Chemistry

基　　金：国家高技术研究发展计划(863计划)项目(2009AA033006);国家自然科学基金项目(50678073);江苏省科技支撑计划-社会发展项目(BE2009636)资助

摘　　要：以膜生物反应器(MBR)处理模拟生活废水为研究体系,考察曝气强度对系统污染物去除效果、脱氢酶活性、胞外聚合物(EPS)组分和含量、Zeta电位、污泥粒径及跨膜压差等的影响.结果表明,随着曝气强度降低,COD去除率变化不大,均大于94.0%,脱氢酶活性明显降低,VSS/SS比值下降;污泥LB-EPS增加,Zeta电位降低,污泥平均体积粒径减小,膜通量下降速率增大.曝气强度为800—400 L.m-.2h-1的条件下,曝气产生的水力剪切力不是影响污泥粒径大小的主导因素,污泥Zeta电位则起着决定作用,但水力剪切力有利于缓解膜污染.In this manuscript,the influence of the aeration intensity on the pollutant removal efficiency,the activity of dehydrogenases,components of extracellular polymeric substances（EPS）,Zeta potential,average size of sludge flocs and membrane fouling was investigated in MBR treatment of synthetic municipal wastewater.The results showed that,with the decrease in aeration intensity,COD removal revealed little variation（〉94%）.The activity of dehydrogenases and VSS/SS ratio dropped.In addition,sludge LB-EPS content increased,but both Zeta potential and the size of sludge flocs declined.The membrane fouling tended to be heavy.With 800—400 L · m-2 · h-1 aeration intensity examined,hydraulic shearing force was not a dominant contribution to the floc size,but Zeta potential played a key role.However,it helped in alleviating membrane fouling.

关 键 词：膜-生物反应器 曝气强度 脱氢酶活性 胞外聚合物 

分 类 号：X703.3[环境科学与工程—环境工程]