超滤膜在城市净水工艺中的应用,选择合适的阈通量是其成功的关键之一。围绕这一关键点,使用4种膜材料(PVC、PVDF、PES和PS)过滤原水,比较分析不同膜材料对阈通量的影响。结果表明PVDF膜的抗污染性最高,所求不可逆阈通量大于30L/(m2.h)。PS膜由于相对较小的截留分子质量,导致污染最严重,不可逆阈通量最小。PVC和PES膜对污染比较敏感,可以测定多个阈通量。 UF membrane in the city water purification technology, the choice of the appropriate threshold flux is one of the keys to its success. Around this critical point, raw water was filtered using four membrane materials (PVC, PVDF, PES and PS) and the effects of different membrane materials on the threshold flux were compared. The results show that PVDF membrane has the highest anti-fouling property, and the irreversible threshold flux is greater than 30L / (m2.h). PS membranes cause the most serious pollution due to the relatively small molecular weight of the entrapment, with the minimum irreversible threshold flux. PVC and PES membranes are sensitive to contamination and allow for the determination of multiple threshold fluxes.