目的研究无机陶瓷膜滤过中药水提液的污染机制,为进行膜污染的防治研究和膜分离技术在中药领域的产业化进行探索。方法采用氧化铝陶瓷微滤膜对清络通痹水提液进行滤过澄清,考察了不同孔径的氧化铝膜对该体系的适用性,通过扫描电镜对膜面切片污染物进行分析,同时结合膜过程中滤过阻力的测定,分析污染物的存在形态、位置与形成规律。结果对于清络痹水提液,0.2μm孔径的氧化铝膜较为适用,有较高的稳定通量和成分保留率,同时污染较轻;3种孔径的氧化铝膜,膜自身阻力和孔堵塞阻力在总阻力中所占比例较小,浓差极化阻力和表面沉积阻力等可逆阻力为主要阻力。结论优化膜过程工艺参数,采用适当预处理方法和清洗方法可以减少膜的污染,使膜的性能有较大恢复。

Objective To study the fouling mechanism during the filtration of traditional Chinese medicine decoction by inorganic ceramic membrane so as to make a valuable exploration both on membrane fouling prevention and the industrialization of membrane separation technology in the field of Chinese materia medica. Methods Micro-filtrating Qingluo Tongbi Decoction using alumina ceramic membrane, researching the applicability of the membrane with different pore sizes, observing the fouling on membrane surface by scanning electron microscopy, studying the resistance distribution of membrane in filtration process, analyzing the fouling existence shape, position, and forming rule. Results In this system, alumina membrane with the pore size of 0.2 μm was most suitable, which had the biggest permeating flux and reservation rate of effective component with less fouling. Among the alumina membranes with three different pore sizes, auto resistance and pore block resistance made up inferior percentage in total resistance, fouling resistance distribution mainly consisted of the reversible resistance, such as concentration polarization and gel layer resistance. Conclusion Optimizing parameters of the techniques in membrane process, using suitable pretreatment method and cleaning method can reduce membrance fouling and make the memberane property recover.

国家自然科学基金资助项目(30171161);国家中医药管理局中医药科学技术研究专项(02-03ZP33)