膜分离技术应用于给水处理中的膜污染研究

Research on membrane fouling in application of membrane separation technology in feed water treatment

针对膜分离技术应用于给水处理系统中的膜污染问题进行了研究。结果表明,采用亲水性的膜进行给水处理,膜污染可以分为浓差极化污染、可清除污染和不可清除污染三大部分,根据达西方程计算膜分离过程中的阻力,其中膜本身阻力占总阻力的51.2%,浓差极化阻力占21.9%,而可清除污染阻力和不可清除阻力相对较小。因此,在给水膜分离系统中若通过优化操作条件减小浓差极化污染,就可达到改善膜污染的目的。

In the process of applying the membrane separation technology to feed water treatment, mem- brane fouling is researched. The results showed that membrane fouling may be divided into three parts： concen- tration polarization fouling, reversible fouling and fouling which is not easy to clean. The resistance is calculated according to Darcy＇ s equation. In total resistance, 51.2% is membrane resistance, 21.9% is concentration po- larization resistance, moreover, reversible resistance and irreversible resistance are less correspondingly. There- fore, in the process of applying the membrane separation technology to the feed water treatment, if the concentra- tion polarization fouling is minished by optimizing the condition in operating, membrane fouling is not restriction of membrane separation technology.