死端型微滤膜的污染机理分析

研究使用死端型微滤去除金枪鱼脾脏提取物中悬浮大颗粒过程中的膜污染机理.膜孔堵塞阻力以及膜表面滤饼层阻力.膜孔堵塞是引起膜通量降低的主要污染机理.而膜表面的滤饼层则决定微滤过程的持续时间.改变膜孔径和透膜压力可影响不同膜污染机理间的转化,从而改变了不同污染机理的持续时间.微滤前离心和预过滤去除了金枪鱼脾脏提取物中的部分悬浮颗粒,改变了其中颗粒尺寸分布从而影响了微滤过程中污染机制.观察发现,颗粒尺寸分布是膜污染机制中较重要的因素.

Analysis of fouling mechanism during dead-end microfiltration of tuna spleen extract

The dead-end microfiltrations were applied to remove suspended solids from the extract of yellowfin tuna spleen before recovery of proteases by ultrafiltration.The pore blocking resistance-limited was the major fouling mechanism for permeate flux decline while cake resistance-limited dominated the most duration of microfiltration process.The change of membrane pore size and transmembrane pressure resulted in the change of fouling mechanism transition and the change of duration for each fouling mechanism.Centrifugation and pre-filtration removed a part of suspended solids in tuna spleen extract before microfiltration,thus changed the particle size distribution in the extract and changed fouling mechanism during microfiltration.It was observed that particle size distribution was more important than other factors for membrane fouling mechanism.