The Application and Mechanism of Superwetting Membrane in Demulsification of Oil over line in over line Water Emulsions

Superwetting membrane can significantly improve the flux of emulsion treatment and effectively alleviate serious membrane pollution problems due to its unique wetting properties of water and oil. Therefore, more and more attention has been paid to the field of emulsion wastewater treatment. In this paper, the design and preparation methods of superhydrophilic membrane, Janus membrane and superwetting membrane with functional sites are summarized, the separation effect is evaluated and the mechanism of action is explored. The membrane is designed and prepared mainly by constructing hydrophilic surface and rough structure. The cross over line linked fiber membrane synthesized by electrospinning method has a good application prospect in emulsion separation because it can break through the limitation of membrane pore size caused by screening effect. At the same time, depending on the type of oil/water separation mode and the application of membranes, we induce the filtration demulsification mode of superhydrophilic membrane and the oil gathering demulsification mode of Janus membrane and their characteristic, the former has the characteristics of low operating pressure, high filtration flux and good anti pollution performance, while the latter has the characteristics of high purity oil gathering. The effect of membrane structure and surfactant concentration on emulsion separation efficiency is also analyzed. Then, the vertical and tangential migration and transformation of droplets in the process of emulsion treatment by superwetting membrane are summarized, and the mechanism of droplet penetrating through the membrane in the process of Janus membrane oil gathering and demulsification and its mechanical analysis are discussed. At present, this part of research is mainly based on the prediction of droplet morphology and qualitative analysis of mechanics, the empirical and quantitative mechanical analysis of relevant mechanisms still need to be further studied. On this basis, a new idea and direction for the subsequent treatment of emulsion wastewater is proposed.