浸没式中空纤维膜污染控制措施比较

针对浸没式中空纤维膜微滤过程中颗粒物污染膜的情况,提出采用鼓泡、反冲洗以及鼓泡和反向脉冲清洗联合使用的方法和措施来减缓或消除膜污染。实验结果表明,鼓泡的作用在于减少膜表面颗粒物的堆积,在鼓泡气量为300 mL/min的条件下,鼓泡可以使滤饼阻力减少到原来的40%。而周期性的反冲洗,如每过滤10 min反冲洗4 min条件下,使得膜内部污染阻力下降到不带反冲洗条件下的1/3。反向脉冲清洗(每过滤10 min反向脉冲清洗30 s)和鼓泡(气量为160 mL/min)的联合使用是本系统的最优膜污染控制方法,可以使滤饼阻力和膜内部污染阻力分别降低到没有任何膜污染控制措施下的10%和20%。

A comparison of several hydrodynamic methods for alleviating fouling in submerged hollow fiber membrane filtration

This study is aimed at improving the particle fouled submerged hollow fiber membrane microfiltration process by employing several methods to alleviate or eliminate membrane fouling.The total resistance in microfiltration can be classified into clean membrane resistance Rm,cake resistance Rc and membrane internal fouling resistance Ri.It was found that gas bubbling is helpful in reducing particle deposition on the membrane surface,e.g.Rc was only 40% of that without bubbling when the gas flow rate was 300mL/...