利用平均膜孔径0.1 μm的聚四氟乙烯(PTFE)平板膜,采用真空膜蒸馏法(VMD)对高浓度Na2 SO4和CaCl2废水进行处理,讨论了渗透压强、进料温度、盐浓度等操作条件对膜蒸馏的出水通量以及截留率的影响.实验结果表明,随着进水温度的升高,冷侧压强的减小,通量随其增大；进料温度对膜蒸馏渗透通量的影响较为明显,进料温度从323.15 K升高至343.15K,渗透通量可增大4.5倍左右；进料溶液盐浓度对渗透通量的影响较小.同时,真空膜蒸馏的截留率较高,均达到99.99％以上.
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