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Membrane distillation (MD) is a promising separation technology for treating industrial wastewater,especially those containing heavy metal,rare earth elements,radioactive elements and high concentration salt [1,2,3].It retains non-volatile components in the feed and allows volatile components to pass through membrane pores in form of vapor.MD process is cornpetitive with traditional evaporation methods or other membrane processes by taking the advantage of using large amount of waste heat.The purpose of this research is to improve the performance of MD such as flux and operation stability to explore the application of MD in the treatment and recycle of waster water from rare earth industry.