0.2μmAl_2O_3陶瓷膜微滤杞菊地黄复方水提液的污染和清洗研究

Study on the 0.2 μm Al_2O_3 Ceramic Membrane Fouling and its Cleaning in the Microfiltation of Extract of Qijudihuang Wan

目的对0.2μmAl2O3陶瓷膜微滤杞菊地黄复方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。方法以杞菊地黄复方水提液为研究对象,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,可选用适用的清洗和再生方法,对工业化生产有一定的指导意义。

Objective To discuss the fouling mechanism of ceramic membrane in the microfiltation of extract of Qijudihuang Wan and obtain the effective cleaning method. Method The extract of Qijudihuang Wan was microfilted in this experiment, 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 was analysed by SEM also. Result （1）For the main body, the filtration resistance is mainly decided by the deposit resistance, the membrane itself and the concentration polarization resistance are less important, and the pore blocking resistance is least important. Moreover, this result is proved by the analysis of SEM. （2）The effective four-step cleaning procotrol, which can almost recover original membrane flux, is achieved by three cleaner, including ultrasound, NaOH solution and HCI solution. Conclusion Based on the different fouling mechanism, the appropriate cleaning method can be obtained. This provides great significance for the application of the industrialized manufacture.