In this work, a bench-scale vacuum membrane distillation crystallization (VMDC) system coupled with microbubble aeration (MBA) was developed for treating high-salinity feed brine. Herein, the effect of seeding dose on membrane fouling and wetting control in the VMDC system was studied by using synthetic saturated calcium sulfate solution. The results showed that introducing gypsum seeds at a dose of 0.5 g/L effectively restricted membrane fouling and wetting. Subsequently, seeding-induced crystallization coupled with MBA was employed to investigate the control effect on membrane fouling and wetting during VMDC with simulated high-salinity feed brine treatment. As 0.5 g/L gypsum seeds were directly added at 7 h in the VMDC experiment while employing MBA, membrane fouling and wetting were effectively controlled. Finally, the mechanism behind the control of membrane fouling and wetting was elucidated during VMDC operation by integrating seeding-induced crystallization with MBA. This could be ascribed to the synergic effect of gypsum seeds and microbubbles in bulk solution. In brief, this work offers a promising approach to control membrane fouling and wetting during concentrating high-salinity wastewater by VMD.

中文翻译：

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晶种诱导结晶与微泡曝气相结合，用于真空膜蒸馏中的膜污染和润湿控制

在这项工作中，开发了一种与微泡曝气 (MBA) 相结合的小型真空膜蒸馏结晶 (VMDC) 系统，用于处理高盐度进料盐水。在此，使用合成的饱和硫酸钙溶液研究了接种剂量对 VMDC 系统中膜污染和润湿控制的影响。结果表明，引入0.5 g/L剂量的石膏晶种可有效限制膜污染和润湿。随后，采用晶种诱导结晶与 MBA 相结合，研究了 VMDC 模拟高盐进料盐水处理过程中对膜污染和润湿的控制效果。 VMDC实验中采用MBA，在7 h时直接添加0.5 g/L石膏晶种，有效控制了膜污染和润湿。最后，通过将晶种诱导结晶与 MBA 相结合，阐明了 VMDC 运行期间控制膜污染和润湿的机制。这可以归因于散装溶液中石膏晶种和微泡的协同效应。简而言之，这项工作提供了一种在 VMD 浓缩高盐废水过程中控制膜污染和润湿的有前景的方法。