采用标称孔径为 0 .2 2 μm的聚偏氟乙烯微孔膜 ,对减压膜蒸馏法分离Cr(VI)水溶液进行了实验研究 ,探讨了进料浓度和pH值对膜分离性能的影响 .得到的最佳工艺条件为 :冷侧真空度 0 .0 96MPa、进料温度 6 0℃、进料流速 6 0L/h .在该工艺条件下膜具有良好的分离性能 ,此时 ,膜通量为 34.52kg/ (m2 ·h) ,截留率为 99.2 5% .结果表明 ,Cr(VI)水溶液经减压膜蒸馏技术处理后 ,能达到 0 .5mg/L的国家Cr(VI)控制浓度排放标准 . The polyvinylidene fluoride (PVDF) microporous membrane with a nominal pore size of 0.222 μm was used to investigate the effect of feed concentration and pH on the separation performance of Cr (VI) The optimal process conditions were as follows: the degree of vacuum on the cold side was 0.096 MPa, the temperature of the feed was 60 ℃, and the flow rate of the feed was 60 L / h. The membrane had good separation performance under the conditions of the process. (34.52kg / (m2 · h)), the rejection rate was 99.2 5% .The results showed that Cr (VI) solution could reach the national Cr (VI) control concentration of 0.5mg / L after the treatment by vacuum membrane distillation Emission Standards .