基于正渗透（FO）是一种新兴的“绿色”解决水污染问题的膜技术，本项目拟研究FO过程在工业污水处理中的应用。工业污水“成分复杂、酸碱度范围宽”，要求FO膜化学稳定性好、耐腐蚀。聚苯并咪唑（PBI）膜“性能稳定、耐腐蚀”，可以用于污水处理。但PBI材料溶解度小，铸膜液不易制备；且现有的PBI膜易脆、易分层、FO过程水通量低、对盐截留率不高。本项目拟通过化学接枝改性PBI材料，提高其亲水性、致密度和溶解性，使新制备的双层PBI-FO中空纤维膜机械性能好、不易分层、水通量和对盐截留率都显著提高；并应用于FO膜工艺对含重金属离子或阴离子的污水进行处理；探索膜污染状况、膜清洗方法和膜再生性能，以优化FO污水处理体系，使膜可以循环利用。本项目对PBI材料的改性、PBI-FO膜的制备及FO膜工艺污水处理的研究将为FO膜技术的发展和应用提供新技术和新思路。

As forward osmosis (FO) is an emerging "green" membrane technology to solve the problems of water pollution, the objective of this project is to study the application of FO processes in industrial wastewater treatment. Industrial wastewater has the features of complicated composition, high concentration and having a broad pH range which require the FO membrane to have a good chemical stability and corrosion resistance. Polybenzimidazole (PBI) membrane with characteristics of good chemical stability and corrosion resistance can be used in wastewater treatment. However, PBI material has a poor solubility and the casting solution is not easy to prepare. Furthermore, the existing PBI membranes are easy to brittle, have the problem of delamination; the water flux and salt rejection are both very low in the FO process. Therefore in this project, we propose to synthesize novel PBI material with properties of good hydrophility, high density and good solubility through chemical grafting, so that the novel dual layer hollow fiber FO membranes fabricated from the novel PBI material will have good mechanical properties and no delamination problem, and have remarkable improvements in both water flux and salt rejection. The novel FO membranes will be applied to FO processes in treating industrial wastewater containing heave metals or anionic species. Meanwhile, investigations of the membrane fouling, membrane cleaning methods and the regeneration performance of the FO membrane will also be conducted to optimize the FO wastewater treatment process and re-use the FO membrane. The modification of PBI material, the fabrication of novel PBI-FO membrane and the study of FO processes in wastewater treatment in this project will provide new technology and ideas for the development and application of the FO membrane technology.