Study on the 0.2 ?m Al_2O_3 Ceramic Membrane Fouling and its Cleaning in the Microfiltation of Extract of Qijudihuang Wan / 中国中医药信息杂志

ABSTRACT

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 ①For 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. ②The effective four-step cleaning procotrol, which can almost recover original membrane flux, is achieved by three cleaner, including ultrasound, NaOH solution and HCl 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.