纳滤膜处理高浓度工业废液浓差极化与膜污染

Nanofiltration Membrane Concentration Polarization and Fouling for Treatment of High Concentration Industrial Waste liquid

当利用纳滤膜处理高浓度工业废液时,实验研究表明随着浓缩时间的延长,渗透液通量衰减系数和膜污染阻力提高很快;浓缩时间较短时,纳滤膜的分离过程由浓差极化控制;浓缩时间较长时,纳滤膜分离过程由浓差极化和膜污染共同控制;提高卷式纳滤膜浓缩液流量会增加纳滤膜浓差极化与膜污染的影响,板式纳滤膜恰与此相反;原浓度高的母液,其渗透液通量衰减系数和膜污染阻力随浓缩时间的延长其提高速率相对也高。

When the nanofiltration membrane is used to treat high concentration industrial waste liquid, the experiment research proves that the permeate flux minishing coefficient and membrane fouling resistance will increase with concentration duration. when concentration duration is short, the nanofiltration is controlled by polarization, otherwise, it is controlled by both polarization and membrane fouling. Increasing concentration flux will enhance the effect of nanofiltration membrane polarization and fouling for spiral membrane , but decrease the effect for flat membrane. When the waste liquid concentration is higher , the effect of nanofiltration membrane polarization and fouling will be more strong.