饮用水UV-LED/氯联用工艺的复合调控机制与应用方法研究

UV/氯联用工艺可高效去除水中新兴污染物和快速灭活致病微生物，且容易在净水工艺中实现，是本领域新近颇为关注的高级氧化技术。然而现有工艺低压汞灯激发波长单一、HOCl/OCl-光解效率低、可调控性差、卤代消毒副产物产量高，难以发挥工艺最佳效能。UV-LED光源具有发射波长任意可调、运行方式多样、光电转化率高等独特优势，有望解决现有工艺存在的问题。本项目将重点开展UV-LED/氯联合工艺调控理论和应用方法研究。通过可调UV-LED与HOCl/OCl-耦合光解研究，获得反应体系活性自由基调控机制；探索工艺优化调控模式效能，掌握污染物降解转化及微生物灭活规律和动力学特征，找出关键影响因子；解析卤代副产物直接生成及前体物变化规律，揭示工艺综合风险影响机制，探索有效的削减方法；通过水力特征与紫外灯珠排布效能模拟与优化，构建实用工艺反应系统；最终为饮用水处理中UV-LED/氯技术的高效应用提供理论依据。

UV/chlorine combined process can efficiently remove emerging pollutants and quickly inactivate pathogenic microorganisms in water. This method can be easily realized in the water purification process and has become a highly focused advanced oxidation technology in recent years. However, the traditional low pressure Hg UV lamp has many drawbacks, such as the single UV wavelength, low HOCl/OCl- photolysis efficiency, poor controllability and high yields of disinfection by-products (DBPs), which prevents the best performance of UV/chlorine process. The UV-LED has the unique advantages of arbitrary adjustable wavelengths, diverse operation modes, high photoelectric conversion rate, etc., which provides the possibility to solve the problems existing in the traditional UV/chlorine process. This project will focus on the study of UV-LED/chlorine combined process regulation theory and its technical application. The following main contents will be investigated: (1) to obtain the regulation mechanism of free radicals by studying the photolysis reaction between wavelength-adjustable UV-LED and HOCl/OCl-; (2) to investigate the pollutant degradation and transformation and microbial inactivation by optimizing UV-LED/chlorine regulation modes, and find out the key impact factors; (3) to analyze the DBP generation and precursor variation in UV-LED/chlorine process, and explore the risk impact factors and effective reduction method; (4) to create a practical UV-LED/chlorine reaction system by optimizing its hydraulic characteristics and UV light distribution. Finally, this project will provide a theoretical basis for the application of UV-LED/chlorine technology in drinking water treatment.