中文摘要：

利用新型高通量聚偏氟乙烯（PVDF）中空纤维疏水膜，对石化企业废水经反渗透（RO）处理的浓排水进行减压膜蒸馏（VMD）处理实验。研究了RO浓排水流速、温度和冷侧真空度对VMD过程中PVDF膜性能的影响，考察了PVDF膜在VMD法RO浓水浓缩过程中的性能变化。结果表明，原液流速对膜性能无明显影响；原液温度或冷侧真空度提高都会使膜的产水通量明显上升，而产水电导保持稳定。在冷侧真空度为～0．095MPa、原液温度70℃、流速0．66m／s的条件下，经15．2h实验，将RO浓排水浓缩20倍，膜的产水通量从25．8L／（m^2·h）降低至11．8L／（m^2·h），产水电导低于4μS／cm，脱盐率高于99．99％，产水CODc，值约30mg／L。经过5次浓缩实验后，PVDF膜的通量和产水电导均保持稳定。

英文摘要：

Novel high flux polyvinylidene fluoride （PVDF） hydrophobic hollow fiber membrane was applied in vacuum membrane distillation （VMD） process for the treatment of reverse osmosis （RO） concentrated wastewater from a petrochemical industry. The effects of the flowing velocity and temperature of the feed solution, and the vacuum pressure on the performance of PVDF membrane were studied. The performance of the membrane in VMD concentration experiment of the wastewater was also tested. The results showed that, the product flux increased obviously as the temperature or the vacuum pressure was enhanced, the flowing velocity of the feed solution only through little light on membrane performance. While the conductivity of the product water was kept stable as the operating conditions varied. The RO drained wastewater was concentrated 20 times after 15.2h of VMD experiment, at -0. 095MPa, 70℃ with a velocity of 0.66m/s. The product water flux decreased from 25.8 to 11.8L/（m^2· h）, the CODcr value of the product water was kept around 30mg/L, with a conductivity below 4μS/cm and a rejection higher than 99.99%. After 5 times of repeated VMD concentration experiment, the initial flux of the last time only showed a decrease of about 2.9L/（m^2· h） comparing to the first time, and the conductivity and CODCr of the product water were both kept stable.