A novel approach to interpret quasi-collimated beam results to support design and scale-up of vacuum UV based AOPs

Water Research X

article

N. Kovoor George¹  B.A. Wols¹  D. Santoro¹  M. Borboudakis¹  K. Bell¹  W. Gernjak¹ 

[1] University of Girona

关键词: Advanced oxidation processes;    Organic micropollutants;    Quasi-collimated beam;    UV/H 2 O 2;    Vacuum ultraviolet;   

DOI  :  10.1016/j.wroa.2022.100158

学科分类：社会科学、人文和艺术（综合）

来源: Academic Press

【 摘 要 】

UV-C at 254 nm and vacuum UV (VUV) at 185 nm are the two major emission lines of a low-pressure mercury lamp. Upon absorption of VUV photons, water molecules and selected inorganic anions generate hydroxyl (HO . ) and other redox radicals, both capable of degrading organic micropollutants (OMPs), thereby offering the opportunity to reduce H 2 O 2 and energy consumption in UV-based advanced oxidation process (AOP). To be successfully scaled-up, the dual-wavelength VUV+UV/H 2 O 2 AOP requires laboratory-scale experiments to establish design criteria. The figures of merit typically used for reporting and interpreting quasi-collimated beam results for UV-based AOPs (time, dose, absorbed energy and E EO ) are insufficient and inaccurate when employed for dual-wavelength AOP such as the VUV+UV/H 2 O 2 AOP, and do not support system scale-up. In this study, we introduce a novel figure of merit, useful absorbed energy (uAE), defined as fraction of absorbed energy that results in the generation of oxidative radicals. Here, results of quasi-collimated beam VUV+UV/H 2 O 2 AOP experiments on four different water matrices are used to introduce 2D plots that employ both uAE UV and uAE VUV as a novel method to represent laboratory-scale experiments of VUV+UV/H 2 O 2 AOP and demonstrate how the 2D plots sufficiently support scale-up of the AOP.

【 授权许可】

CC BY|CC BY-NC-ND