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Vacuum UV-based processes for water and wastewater purification: From unitary to multicomponent systems
Water Research ( IF 11.4 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.watres.2025.123175
Chuang Wang, Xiaohui Wang, Jinying Du, Renjian Deng, Bozhi Ren, Saijun Zhou, Baolin Hou, Yaoyao Huang, Zhiwei Zhao

Vacuum ultraviolet (VUV) is profitable to strengthen the efficiencies of UV and reduce chemicals use, attracting more attention to water and wastewater purification. Herein, VUV-based water treatment processes from unitary VUV to multicomponent systems were reviewed for the first time to promote VUV applications. The rate of pollutant removal by unitary VUV was 1.3-57 times that of UV, in which hydroxyl radical oxidation was dominant. And the reducibility of hydrated electron and hydrogen atom radical in unitary VUV dehalogenated organics and reduced metal ions. Besides, VUV-based binary systems mainly included processes of VUV/H2O2, VUV/persulfate, VUV/ozone, VUV/chlorine, VUV/sulfite, VUV/iron ion, and VUV-based heterogeneous oxidation. VUV-based ternary systems basically contained three types: VUV-based Fenton-like, VUV coupling dual oxidants, and VUV combined with other technologies activating oxidants. Performance, characteristics, reactive species, and mechanisms of VUV-based binary and ternary systems were summarized. Moreover, the characterization, contribution, and role of reactive species in VUV-based processes were analyzed, and the combination of multiple methods was conducive to accurately identifying the mechanism of reactive species. Furthermore, the combination of VUV and other technologies expanded the application potential of VUV. Compared to UV-based processes, VUV-based processes significantly reduced energy consumption and were more promising in removing contaminants in actual waters. Finally, hot spots and directions (develop new techniques, reduce by-products, combine simulation and experiment, broaden removal objects, enhance pilot studies) of VUV-based water treatment technologies in future were prospected. Overall, VUV-based advanced oxidation processes are expected to be used in water treatment to improve process efficiency.

中文翻译:


用于水和废水净化的基于 UV 的真空工艺:从整体系统到多组分系统



真空紫外线 (VUV) 可以提高紫外线效率并减少化学品的使用,从而吸引更多人关注水和废水净化。本文首次回顾了从单一 VUV 到多组分系统的基于 VUV 的水处理工艺,以促进 VUV 的应用。单一 VUV 去除污染物的速率是 UV 的 1.3-57 倍,其中羟基自由基氧化占主导地位。以及幺正 VUV 脱卤有机物和还原金属离子中水合电子和氢原子自由基的还原性。此外,基于 VUV 的二元系统主要包括 VUV/H2O2、VUV/过硫酸盐、VUV/臭氧、VUV/氯、VUV/亚硫酸盐、VUV/铁离子和基于 VUV 的非均相氧化过程。基于 VUV 的三元体系基本包含三种类型:基于 VUV 的 Fenton 类、VUV 耦合双氧化剂和 VUV 与其他技术相结合的活化氧化剂。总结了基于 VUV 的二元和三元系统的性能、特性、反应性物质和机制。此外,分析了反应性物质在基于 VUV 的过程中的表征、贡献和作用,多种方法的结合有利于准确识别反应性物质的机制。此外,VUV 与其他技术的结合扩大了 VUV 的应用潜力。与基于 UV 的工艺相比,基于 VUV 的工艺显著降低了能耗,并且在去除实际水域中的污染物方面更有希望。最后,展望了未来基于 VUV 的水处理技术的热点和方向 (开发新技术、减少副产物、结合模拟和实验、扩大去除对象、加强试点研究)。 总体而言,基于 VUV 的高级氧化工艺有望用于水处理以提高工艺效率。
更新日期:2025-01-21
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