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- Title
Evaluation of the disinfection effect and mechanism of SO<sub>4</sub><sup>•−</sup> and HO<sup>•</sup> UV/persulfate salts.
- Authors
Huang, Zaihui; Qi, Zheng; Liu, Chunguang
- Abstract
Although ultraviolet (UV) and persulfate (PS) have been widely used in water disinfection process, their incompleteness of disinfection, such as inducing the production of viable but non-culturable cells (VBNC), has attracted extensive attention. In this study, the disinfection effect of combined UV and PS was evaluated, and the roles of SO4•− and HO• radicals in UV/PS disinfection were also analyzed. UV/PS more effectively inactivated cells and reduced the number of culturable cells. Also, the test of bacterial dark activation suggested that UV/PS disinfection inhibited the recovery of VBNC bacteria. The mechanisms of UV/PS disinfection were the increase of membrane permeability and oxidative stress, where SO4•− radicals played more role than HO• radicals. Furthermore, UV/PS disinfection more significantly perturbed the metabolism of Pseudomonas aeruginosa (p < 0.05), mainly involving glyoxylate and dicarboxylic acid metabolism, aminoacyl-tRNA biosynthesis, Alanine, aspartate and glutamate metabolism, and citric acid cycle (TCA cycle). In short, UV/PS disinfection can not only significantly reduce the number of culturable bacteria (kill bacteria) but also inhibits the recovery of VBNC bacteria.
- Subjects
KREBS cycle; WATER disinfection; RADICALS (Chemistry); DICARBOXYLIC acids; MEMBRANE permeability (Biology)
- Publication
Environmental Science & Pollution Research, 2023, Vol 30, Issue 18, p52380
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-023-26120-3