均相高级还原技术去除水中硝态氮的研究进展  

Research Progress on Removal of Nitrate From Water by Homogeneous Advanced Reduction Technology

作　　者：李宏辞 吴磊[1] Li Hongci;Wu Lei(School of Energy and Environment,Southeast University,Nanjing,Jiangsu 210096,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《绿色科技》2023年第4期73-77,86,共6页Journal of Green Science and Technology

基　　金：江苏省科委社会发展基金(编号:BE2021619)。

摘　　要：世界范围内水体中硝态氮污染日益严峻,已经威胁到饮用水质量和水生生态系统的安全。近年来利用水合电子(e_(aq)^(-))和二氧化碳阴离子自由基(CO_(2))还原水中硝态氮的均相高级还原技术,以其较高的脱氮效率被认为是极具前景的硝态氮的去除技术。鉴于此,分析了均相高级还原体系还原水中硝酸盐的研究进展,包括去除效果、反应原理和自由基生成规律,分析了各体系的优点和不足,对该技术未来发展进行了展望和建议。结果显示:多种均相高级还原体系均可通过产生自由基快速还原水中的硝态氮,但仍存在能耗高、有副产物残留等问题。提出了未来高级还原技术的发展应聚焦加快自由基生成速率、减少二次污染和通过改良光源以降低能耗。Nitrate contamination in water is becoming increasingly serious worldwide,which has threatened the quality of drinking water and the safety of aquatic ecosystems.In recent years,homogeneous advanced reduction system based on hydration electron(e_(aq)^(-))and carbon dioxide anion radical(CO_(2))has been considered as a promising technology for nitrate removal in water due to its excellent nitrogen removal efficiency.In this review,the removal efficiency of nitrate in water,selectivity of nitrogenous gas,reaction mechanism and free radical generation rule of these systems were compared and analyzed.The advantages and disadvantages of each system were also analyzed;future development of this technology and suggestion are prospected.The results show that homogeneous advanced reduction systems can rapidly reduce the nitrate in water by generating free radicals,but there are still high energy consumption and residual byproducts.The development of advanced reduction technology in the future should focus on accelerating free radical generation rate,reducing secondary pollution and reducing energy consumption by improving light source.

关 键 词：高级还原技术 硝酸盐 化学反硝化 水合电子 二氧化碳阴离子自由基 

分 类 号：X524[环境科学与工程—环境工程]