0.2μm Al_2O_3陶瓷膜微滤杞菊地黄丸水提液的污染机理及清洗研究

Fouling and its cleaning of 0.2 μm Al_2O_3 ceramic membrane in themicrofiltation of extract of Qijudihuang Pills

目的:对0.2μmAl2O3陶瓷微滤膜过滤杞菊地黄丸水提液过程中膜污染机理进行研究,并寻找有效的膜清洗方法。方法:以杞菊地黄丸水提液为研究对象,根据Darcy-Poiseuille定律这一过滤模型确定过滤阻力分布情况,同时对污染膜表面和截面的进行高分辨扫描电镜观测。结果:①对于本体系,膜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,这与通过对SEM图像的分析所得到的结果大致相吻合。②本体系采用了超声、NaOH溶液清洗、HCl溶液清洗、NaOH溶液清洗的清洗步骤,膜的渗透通量基本可以完全恢复。结论:根据膜污染机理的不同,选用适用的清洗剂再生方法,这对于对工业化生产有一定的指导意义。

AIM： To discuss the fouling mechanism of 0. 2 μm Al2O3 ceramic membrane in the microfiltation of extraction of Qijudihuang Pills, and obtain the effective cleaning proeotrol. METHODS： The extract of Qijudi-huang Pills microfiltered and the distributions of filtration resistance were studied according to the Darcy-Poiseuille principle. The characteristic of the surface and section of the polluted membrane were analysed by SEM also. RE- SULTS： ① For the main body, the filtration resistance was mainly decided by the deposit resistance, the membrane itself and the concentration polarization resistance were less important, and the pore blocking resistance was minimum. Moreover, this result was proved by the analysis of SEM. ② The effective four-step cleaning procotrol, which could almost recover original membrane flux, was achieved by three cleaner, including ultrasound, NaOH solution and HCl solution. CONCLUSION： Based on the different fouling mechanism, the appropriate cleaning procotrol can be obtained. This provides great significance for the application of the industrialized manufacture.