采用气升式陶瓷膜过滤工艺进行盐水精制,研究了曝气量、跨膜压差和料液固含量对膜通量的影响,并计算了过滤阻力及表观能耗.实验结果表明,跨膜压差为60 kPa,曝气量从200 L/h增加到500 L/h时,膜通量从200 L/(m2·h)增加到360 L/(m2·h),提高了80%;进一步提高曝气量,膜通量的增幅不大.曝气量为500 L/h时,膜通量随跨膜压差的增大而线性增加.曝气条件下,固含量在0~25 g/L范围内,随着固含量增大,膜通量略有下降,降幅小于10%.计算结果表明,曝气过程能够有效降低膜过滤阻力,基本消除浓差极化的影响;与错流过滤相比,通过气液两相流对膜过程的强化作用,气升过程能使表观能耗显著降低.
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