城市污水中有机污染物的高效矿化协同资源化与能源化机制研究

开发高效低耗的城市污水资源化/能源化处理技术是当前研究热点和难点。然而以提高污染物去除效率和降低机械能耗方法，难以进一步提升处理性能。本项目拟通过有机污染物矿化产物资源化、污染物矿化协同产氢和处理过程热能转化，探索城市污水处理能量自持的新机制。本项目以材料制备—原理探究—器件构建—工艺开发为主线，采用光电催化氧化和光电催化还原技术耦合，研究城市污水中有机污染物高效降解与同时高质转化为醇类或酸类的规律；探究有机污染物高效矿化及同步产氢机理；研究光电催化处理过程中热量回收与高效转化为电能的机理；研究适应污染物矿化、资源化/能源化和电能转化三者协同的反应器，探索污染物矿化协同资源化和能源化的系统优化与调控规律,构建城市污水中有机污染物高效矿化协同资源化与能源化的耦合技术与工艺；在城市污水资源化和能源化处理的过程机理、关键技术、核心器件和耦合工艺上实现突破，为城市污水资源化和能源化处理提供新思路。

The searching and development of an efficient and low-cost technique for urban sewage treatment and simultaneous resource recycling and energy regeneration is a current hot topic yet challenging. At present, it is difficult to have a further improvement in urban sewage treatment only by increasing the efficiency of pollutant removal and reducing the mechanical energy consumption. Herein, we will initiate a project aiming at the development of a novel system for energy self-sufficiency in urban sewage treatment process through mineralization of organic pollutants in combination with CO2 reduction to value-added chemicals, energy-dense H2 generation as well as the thermal energy conversion. In this project, the technologies of photoeletrocatalytic oxidation merging with photoeletrocatalytic reduction will be adopted to study the performance of organic pollutants degradation in combination with simultaneous CO2 conversion to alcohols or acids, H2 evolution and thermal energy conversion in urban sewage treatment. In addition, the relationship between each photoeletrocatalytic oxidation reactions and photoeletrocatalytic reduction reactions, as well as thermal energy conversion will also be systematically explored. Combined with many advanced methods like DFT calculation and molecular simulations, the adsorption, migration and transformation of organic pollutants on photoanodes and the CO2 reduction and hydrogen evolution on photocathodes will be deeply studied. Based on these results, we hope that the pivotal factors in influencing the synergistic reactions between photoanodes and photocathodes can be clarified clearly. By revealing how the electrode influences the catalytic performance, we expect that a highly efficient urban sewage treatment technique for organic pollutants’ mineralization coupled with simultaneous recycle of resource and energy can be elementary established under the guidance of material preparation, mechanism exploration to device construction. Significantly, the above research would provide a new idea and theoretical basis for the application of the coupling of photoelectrocatalytic oxidation with photoeletrocatalytic reduction as well as thermal conversion in actual urban sewage treatment and simultaneous recycle of resource and energy.