真空膜蒸馏法处理含铀废水

Treatment of Uranium-Bearing Wastewater by Vacuum Membrane Distillation

采用聚丙烯微孔膜对含铀废水进行真空膜蒸馏（VMD）处理研究，考察了进料铀的温度、质量浓度、流速以及真空侧压力对膜通量及截留率的影响，得到了最佳工艺条件；进料流速，0．5m／s；进料温度，55℃；真空侧压力，2．66kPa。在该条件下，当料液中铀的质量浓度为1～9mg／L时，膜具有良好的分离性能，膜通量为3．5kg／（m^2·h），截留率为99．1％，馏出液中铀的质量浓度低于国家排放标准（0．05mg／L）。实验结果表明，作为一种新颖的水处理技术，真空膜蒸馏法将在含铀废水处理中发挥重要作用。

The removal of uranium from wastewater was carried out by vacuum membrane distillation（VMD） using microporous polypropylene membrane. The effects of feed temperature, mass concentration of U, flow rate and vacuum-side pressure on permeation flux and rejection were studied. The optimum experimental conditions are as follows： feed flow rate is 0.5 m/s, feed temperature is 55 ℃, vacuum-side pressure is 2.66 kPa. When the mass concentrations of U in the feed solution range from 1 mg/L to 9 mg/L, the membrane flux is 3.5 kg/（m2 · h） and the rejection rate is 99.1% under the optimum conditions. The water separated from uranium solution by vacuum membrane distillation could meet the state-controlled discharge standard 0.05 mg/L. The VMD as a novel technology will play an impor- tant role in the treatment of uranium-bearing wastewater.