微塑料对膜蒸馏处理含锑高盐废水性能影响研究

研究了微塑料在膜蒸馏过程中不同温度、pH、微塑料浓度和微塑料粒径条件下对含锑高盐废水的处理性能及机理.结果表明，随着进料液温度的升高，饱和蒸汽压的增加提高了传质动力，不含微塑料时膜通量由17.4 L·m^-2·h^-1提高至20.7 L·m^-2·h^-1，通量提升了18.9%，含有微塑料时膜通量由15.6 L·m^-2·h^-1提高至18.5 L·m^-2·h^-1，提升了18.6%；pH由3增大至11时，由于重金属锑在不同pH条件下的价态变化及静电排斥作用，重金属锑截留率由98.2%提升至99.6%；微塑料浓度的增加会降低膜通量，提高锑截留效果，这可能是微塑料对溶液中重金属锑的吸附作用及微塑料在膜表面的积聚产生的筛分效应引起的.

Effect of microplastics on the treatment of high salinity wastewater with antimony by membrane distillation

Effect of microplastics on the treatment performance of membrane distillation (MD) for high salinity wastewater with antimony were investigated under different conditions of temperature, pH, microplastic concentration and microplastic particle size in feed solution. Results showed that with the increasing temperature of the feed solution, the permeate flux increased from 17.4 L·m^-2·h^-1 to 20.7 L·m^-2·h^-1 without microplastics in feed solution, while increased from 15.6 L·m^-2·h^-1 to 18.5 L·m^-2·h^-1 with microplastics in feed solution, attributing to the increase of vapor pressure and mass transfer in MD process. The rejection of antimony increased from 98.2% to 99.6% with the increasing of feed solution pH from 3 to 11 due to the enhancement of steric hindrance and electrostatic repulsion between membrane surface and antimony. The increase of microplastics concentration reduced the permeate flux and improved the rejection of antimony in MD process. The accumulation of microplastics may block membrane pores, resulting in the improvement of steric hindrance in MD process. Besides, antimony could be adsorbed by microplastics, which further improved the rejection of antimony.