附加电场对中空纤维膜污染的减缓作用

通过对新型附加电场的中空纤维膜组件的实验室研究,探讨了电场对缓解微滤膜污染的作用.在恒定流量下过滤含有20mg/L腐殖酸的原水,无电压时,跨膜压力从0.0200MPa上升到0.0300MPa耗时2h,而施加60V电压时该时间段延长至10h.研究表明,原水中的腐殖酸在电场中发生电泳迁移,减少了向膜表面的移动,其对膜的污染被减缓;同时腐殖酸在电场中发生凝聚现象,沉积在膜表面形成疏松的滤饼层,是跨膜压力增加缓慢的另一原因.

Effect of an electric field on the fouling of the hollow fiber microfiltration membrane

A new type of electric hollow fiber membrane module was developed for laboratory scale research. The effect of an electric field on the fouling process of the hollow fiber microfiltration membrane was investigated in a new type of module. The transmembrane pressure(TMP) was increased from 0.0200 to 0.0300MPa during constant flow filtration of raw water containing 20mg/L humic acid. The test took 10 hours using a votage of 60V applied across the module and 2 hours when no voltage was applied. Under the condition of electrophoretic migration, the membrane fouling was minimized, because the motion of humic acid was directed away from membrane surface. Humic acid aggregated in an electric field and formed a loose cake layer on the membrane surface, which also relieved membrane fouling.