Laboratory of Engineering Ecology, Baikal Institute of Nature Management SB RAS, Sakhyanovoy St. 6, Ulan-Ude 670047, Russia.
Laboratory of Engineering Ecology, Baikal Institute of Nature Management SB RAS, Sakhyanovoy St. 6, Ulan-Ude 670047, Russia.
Water Res. 2018 Apr 1;132:177-189. doi: 10.1016/j.watres.2017.12.079. Epub 2018 Jan 4.
Over the last decade, ultraviolet light-emitting diodes (UV LEDs) have attracted considerable attention as alternative mercury-free UV sources for water treatment purposes. This review is a comprehensive analysis of data reported in recent years (mostly, post 2014) on the application of UV LED-induced advanced oxidation processes (AOPs) to degrade organic pollutants, primarily dyes, phenols, pharmaceuticals, insecticides, estrogens and cyanotoxins, in aqueous media. Heterogeneous TiO-based photocatalysis in lab grade water using UVA LEDs is the most frequently applied method for treating organic contaminants. The effects of controlled periodic illumination, different TiO-based nanostructures and reactor types on degradation kinetics and mineralization are discussed. UVB and UVC LEDs have been used for photo-Fenton, photo-Fenton-like and UV/HO treatment of pollutants, primarily, in model aqueous solutions. Notably, UV LED-activated persulfate/peroxymonosulfate processes were capable of providing degradation in DOC-containing waters. Wall-plug efficiency, energy-efficiency of UV LEDs and the energy requirements in terms of Electrical Energy per Order (E) are discussed and compared. Despite the overall high degradation efficiency of the UV LED-based AOPs, practical implementation is still limited and at lab scale. More research on real water matrices at more environmentally relevant concentrations, as well as an estimation of energy requirements providing fluence-based kinetic data are required.
在过去的十年中，紫外线发光二极管（UV LED）作为替代含汞的紫外线水消毒光源受到了广泛关注。本综述全面分析了近年来（主要是 2014 年后）关于 UV LED 诱导的高级氧化工艺（AOPs）在降解水中有机污染物（主要是染料、酚类、药物、杀虫剂、雌激素和蓝藻毒素）方面的应用数据。使用 UVA LED 进行实验室级水的基于 TiO2 的多相光催化是处理有机污染物最常用的方法。讨论了周期性间歇光照、不同 TiO2 纳米结构和反应器类型对降解动力学和矿化的影响。UVB 和 UVC LED 已用于光芬顿、类光芬顿和 UV/HO 处理污染物，主要是在模型水溶液中。值得注意的是，UV LED 激活过硫酸盐/过一硫酸盐工艺能够在含有 DOC 的水中进行降解。讨论并比较了壁装式效率、UV LED 的能效以及以每阶电（E）表示的能量需求。尽管基于 UV LED 的 AOPs 的整体降解效率很高，但实际应用仍然有限，且处于实验室规模。需要在更具环境相关性的浓度下对实际水基质进行更多研究，并对提供基于辐照量的动力学数据的能量需求进行评估。
