气液两相流下膜的抗污染性能研究  

Influence of gas-liquid two-phase flow on the anti-fouling performance of tubular membranes module for microfiltration

作　　者：钱光磊[1] 周集体[1] 张劲松[1] 刘万涛[1] 

机构地区：[1]大连理工大学环境学院,大连116024

出　　处：《膜科学与技术》2012年第5期34-38,44,共6页Membrane Science and Technology

摘　　要：膜表面浓差极化与滤饼层形成是膜污染的重要因素.通过管式膜曝气,使膜表面形成气液两相流,增大膜表面剪切力,能有效控制膜污染行为.实验通过微滤高岭土悬浊液,观察了不同曝气量下膜组件内气液流态,发现随着曝气量的增加,膜组件内气泡单元上升速率和频率加快,膜污染速率逐渐减小,延长了膜过滤运行时间.研究发现,气体的通入使膜表面湍流程度增大,有效减缓跨膜压力增长速率,并且实现了在较低流速下控制膜污染,节省了能耗成本,延长了膜使用寿命.Concentration polarization and cake layer formation on the surface of the membrane are two significant aspects resulting in membrane fouling. Aeration in tubular membrane module can form gas liquid two-phase flow, which can increase the shear force on the surface of tubular membrane and control the membrane fouling effectively. In this study, experiments were conducted under different gas flow rates in tubular membrane module. As it was shown, bubble rate and bubble frequency increased obviously as aeration increased yet membrane fouling rate decreased gradually so as to extend the membrane filtration operation time. It was found that the injected gas can increase turbulence on the surface of membrane to slow down transmembrane pressure rate and keep membrane fouling with a low flow rate, thus it can save the energy consumption and prolonging membrane service life.

关 键 词：膜污染 两相流 浓差极化 

分 类 号：X703[环境科学与工程—环境工程]