CAJ | 학술논문

用扫描电镜表面观察和全自动压汞仪测定了2种亲水化改性PVDF微滤膜的平均孔径、孔隙率等基本性能参数.对2种膜的纯水通量,及其平板膜组件在好氧膜生物反应器内污染过程进行分析.结果显示,2种膜污染过程均呈现先缓慢后快速的"二阶段"趋势,第二阶段是膜污染的主导阶段.尽管平均孔径小、孔隙率高的膜本身阻力大、纯水通量低,但其污染速率较低,物理及化学清洗恢复率较高.膜孔径及孔隙率指标是影响其在MBR中运行的污染速率的主要因素,平均孔径小、孔隙率高的膜抗污染能力强.
용소묘전경표면관찰화전자동압홍의측정료2충친수화개성PVDF미려막적평균공경、공극솔등기본성능삼수.대2충막적순수통량,급기평판막조건재호양막생물반응기내오염과정진행분석.결과현시,2충막오염과정균정현선완만후쾌속적"이계단"추세,제이계단시막오염적주도계단.진관평균공경소、공극솔고적막본신조력대、순수통량저,단기오염속솔교저,물리급화학청세회복솔교고.막공경급공극솔지표시영향기재MBR중운행적오염속솔적주요인소,평균공경소、공극솔고적막항오염능력강.
In this paper,two kinds of hydrophilic PVDF porous MF membranes were investigated by SEM and automated mercury porosimeters to gain the average pore size and porosity.In order to select a preferable membrane,the pure water flux and the fouling process of these two flat-sheet membrane modules during the application in MBR were analyzed.The result showed that the fouling velocity was slow in the first stage,and then became fast in the second stage for both membranes.And the membrane with smaller average pore size and higher porosity had a relative lower fouling rate and higher permeability recovery rate by chemical or physical cleaning,despite of its larger resistance and lower pure water flux.The pore size and porosity of the membrane are the main factors for the fouling rate during the application in MBR,the membrane of smaller average pore size and higher porosity has strong resistance to fouling.