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目的:研究无机陶瓷膜微滤黄芪水提液的污染机制,寻找有效的膜污染防治手段。方法:通过对不同孔径的氧化锆膜在膜微滤过程中的阻力分布、高分子去除率、物理化学参数变化等的测定,分析污染物的存在状态或位置以及形成规律,同时采用反冲、超声2种物理手段强化膜过程,从而探索膜污染的防治方法。结果:0.2μm ZrO2微滤黄芪水提液时污染度较高,达44.9%;堵孔阻力和浓差极化阻力是主要的过滤阻力,表面沉积阻力随膜孔径的减小而增大;微滤后药液浊度显著降低,pH和黏度变化均较小,0.2μm ZrO2膜对电导率的降低作用略高于0.05μm ZrO2膜管。0.2,0.05μm ZrO2膜均对果胶的去除作用最为显著。超声强化膜过程手段更适用于本体系,其通量提高率达41.7%。结论:优化膜过程工艺参数,采用适当膜污染防治手段可以减少膜的污染,使膜的性能有较大恢复,提高滤过效率。
Objective: To study the pollution mechanism of inorganic ceramic membrane microfiltration Astragalus extract to find an effective means of preventing and controlling membrane fouling. Methods: Based on the determination of resistance distribution, polymer removal rate, changes of physicochemical parameters and the like during the process of membrane microfiltration of zirconia membranes with different pore diameters, the existing state or position of pollutants and the formation regularity were analyzed. At the same time, Ultrasound two kinds of physical means to strengthen the membrane process, to explore the prevention and control of membrane fouling. Results: The polluted degree of the 0.2μm ZrO2 microfiltered Astragalus membranaceus water extract was high, reaching 44.9%. The blocking resistance and concentration polarization resistance were the main filtration resistances. The surface deposition resistance increased with the decrease of membrane pore size. After filtration, the turbidity of the solution was significantly reduced, pH and viscosity changes were small, 0.2μm ZrO2 film to reduce the conductivity slightly higher than the 0.05μm ZrO2 film tube. 0.2, 0.05μm ZrO2 film are the most obvious pectin removal. Ultrasonic membrane process means more suitable for the system, the flux increase rate of 41.7%. Conclusion: Optimizing the process parameters of the membrane process, using appropriate membrane pollution control measures can reduce the membrane pollution, the membrane performance has a greater recovery, improve filtration efficiency.