一体式膜-生物反应器经济曝气量的试验研究  

Experimental study on economical aeration intensity in a submerged membrane bioreactor

作　　者：张传义 王勇[1] 黄霞[1] 李中和[2] 

机构地区：[1]清华大学环境科学与工程系环境模拟与污染控制国家重点联合实验室,北京100084 [2]中国矿业大学环境与测绘学院,徐州221008

出　　处：《膜科学与技术》2004年第5期11-15,共5页Membrane Science and Technology

基　　金："985"城市水危机项目

摘　　要：增大曝气量一方面可提高膜面液体循环流速,从而减缓污泥在膜表面的沉积,降低膜污染形成速率;另一方面曝气量的增加也造成污泥粒径分布的变化,使混合液中细小污泥颗粒增多,从而导致膜孔堵塞,引起膜污染速率增加.一定污泥浓度下存在一个经济的曝气量,使得污泥絮体不大量在膜表面沉积,同时也不会产生更多的细小污泥粒子.实验考察了一体式膜-生物反应器在不同污泥浓度、不同曝气量下膜污染的发展趋势.实验结果:在污泥浓度为3,6,8和10g/L下的经济曝气量分别为36,72,84,120m3/(m2·h),经济曝气量随污泥浓度的增大而增加.Increasing aeration intensity could increase cross flow velocity over the membrane surface and hence retard the sludge deposit and membrane fouling,but over extended aeration could induce the production of small size particles and lead to the clog of membrane pores.Under certain sludge concentration,economical aeration intensity existed at which sludge flocs did not deposit on the membrane surface,and at the same time small parˉticles were not produced.Membrane fouling increasing rates were experimentally investigated at different sludge concentrations and aeration intensities.Economical aeration intensities of a submerged membrane bioreactor at sludge concentrations of3,6,8g/L and10g/L were36,72,84m 3 /(m 2 ·h)and120m 3 /(m 2 ·h),respectively,which increased with sludge concentration increasing.

关 键 词：膜-生物反应器 经济曝气量 污泥浓度 膜污染 粒径分布 

分 类 号：X703[环境科学与工程—环境工程]