中文摘要：

目的：探讨孔径为0．2μm的Al2O3陶瓷膜澄清糖渴清复方水提液过程中的膜污染机理。方法：考察膜孔径和膜材料对澄清过程中的过滤阻力和阻力分布的影响，并重点针对0．2μmAl2O3陶瓷膜，采用高分辨扫描电镜对新鲜膜和污染膜的表面和断面进行微观观测和对膜表面污染物进行理化分析。结果：膜孔径和膜材料对过滤阻力及其分布有影响。阻力分布和SEM图结果显示：0．2μmAl2O3膜污染主要发生在膜表面。膜表面污染物主要是含C=O、CO—NH和C—O—C官能团的化学物质。表面污染物的粒径以体积百分数计主要集中在23．738μm左右；以数量计主要集中在0．521μm左右。结论：所得到的理论结果为采用0．2μmAl2O3陶瓷膜对糖渴清复方水提液澄清工艺中减缓膜通量下降措施的选择和膜的再牛奠定了一定的理论基础。

英文摘要：

AIM： To discuss the fouling mechanism in 0.2 μm Al2O3 commie membrane microfihation of Tangkeqmg Compound water extract. METHODS： The total filtration resistance and its distribution were used as indexes to study the effect of pore size and materials of ceramic membrane on membrane fouling in clarification. SEM （scanning electronic microgragh） technology was used to study the microstructure of surface and section of new membrane and contammted membrane and physica and chemical examination were done on the fouling substances on the membrane surface. RESULTS ： The pore size and materials of membrane affected the total filtration resistance and its distribution in clarification. The results of filtration resistance dislribution and SEM suggested that the fouling of 0.2 μm Al2O3 membrane mainly lied on the surface. The contaminations on membrane surface were mostly the substances holding function groups, such as C = O, CO-NH and C-O-C. According to volume percentage, the semidiameter of contaminations on the membrane was mostly around 23. 738μm. However, according to quantity percentage, the semidiameter of contaminations on the membrane was mostly around 0. 521 μm. CONCLUSION： Study on the fouling mechanism of the membrane is of great significance for looking for the effective measures for relieving the downward trend of the membrane flux and for the appropriate membrane cleaning in the clarification of Tangkeqing Compound extract using 0.2μmAl2O3 ceramic membrane.