目的研究0.2μmAl₂O₃陶瓷膜微滤杞菊地黄丸水提液过程中的膜污染机制。方法以杞菊地黄丸水提液为研究对象, 根据Darcy-Poiseuille定律确定滤过阻力分布情况, 对污染膜表面沉积层的组成物质进行了傅里叶转换红外光谱分析和粒径分析, 同时对污染膜表面和截面进行高分辨扫描电镜观测。结果膜滤过阻力主要集中在表面沉积层, 膜本身的阻力及浓差极化层阻力起了次要作用, 膜孔内部污染阻力所占比例最小。并且, 这与通过SEM图像的分析所得到的结论大致相吻合。通过红外光谱对膜污染物进行定性分析可知膜污染物中分子主要具有肽键、羰基和羟基。污染膜表面沉积层的组成物质的粒径分布情况为占有较大体积百分数的粒子的半径集中在18.627μm左右, 而占有较高数量的粒子的半径集中在0.424μm左右。结论研究微滤过程中的膜污染机制对于采用减缓膜通量减少的措施及寻找有效的膜再生方法有重要指导作用。

Objective To discusse the fouling mechanism of 0.2 μm A1₂0₃ ceramic membrane in the microfiltration of Qiiu Dihuang Pill aqueous extract.Methods Qiju Dihuang Pill aqueous extract was microfihered in this experiment.The distributions of filtration resistance were studied according to the Darcy-Poiseuille principle.The substance of deposit on the membrane surface was analysed by Fourior transform infrared spectrum and particle diameter analysis.The characteristic of the surface and cross section of the polluted membrane was observed by SEM.Results The filtration resistance was mainly concentrated Oil the surface of deposit resistance,the membrane itself and the concentration polarization resistance were less important.and the pore blocking resistance was the Ieast important.Moreover,this result was proved by SEM analysis.The molecule of the fouling substance mainly contained peptid, carbonyl,and hydroxy bonds by IR.The particle size distribution of the deposit substance on the polluted membrane surface：The particle radius taking a larger percentage in volume concentrated in 18.267μm around,while the particle radius taking a larger percentage in quantity concentrated in 0.424 μm around.Conclusion Study on the fouling mechanism of the membrane in the microfiltration provides a great significant guidance for exploring the effective measure of relieving the reduced membrane flux and the appropriate cleaning proeotrol.

国家自然科学基金项目(30171161;30572374);国家中医药管理局中医药科学技术研究专项(02-03ZP33)