Formation of halonitromethanes from glycine during LED-UV 265 /chlorine disinfection.

Autor: Tang Q; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China., Zhu L; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China., Wang Q; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China., Deng L; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China. Electronic address: lindeng@seu.edu.cn., Hu J; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China; College of Environment, Zhejiang University of Technology, Hangzhou 310014, China., Singh RP; Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2023 Dec 15; Vol. 348, pp. 119225. Date of Electronic Publication: 2023 Oct 11.
DOI: 10.1016/j.jenvman.2023.119225
Abstrakt: LED-UV 265 /chlorine is a promising alternative disinfection technology that emits mono-wavelength light for high germicidal efficiency. Halonitromethanes (HNMs) are highly cytotoxic and genotoxic disinfection byproducts that can be formed during LED-UV 265 /chlorine disinfection. Thus, this work aimed to investigate the HNMs formation from glycine (Gly) during LED-UV 265 /chlorine disinfection. The results indicated that the concentrations of chlorinated-HNMs (Cl-HNMs) increased first and then decreased as the reaction proceeded. Besides, the effects of operating parameters (UV intensity, free chlorine dosage, and pH) and coexisting ions (Cu 2+ and Br - ) on HNMs formation were investigated. It was found that the formation concentrations of Cl-HNMs increased with the increase of LED-UV 265 intensity and free chlorine dosage but decreased with increased pH. The presence of Cu 2+ promoted the formation of Cl-HNMs. The total concentration of HNMs (at 3 min) with adding 1.5 mg/L Cu 2+ was 30.90% higher than that without Cu 2+ . Notably, nine species of HNMs were detected after adding Br - , and the total concentrations of HNMs were enhanced. Moreover, Cl-HNMs were gradually transformed into brominated (chlorinated)-HNMs and brominated-HNMs as Br - concentration increased. According to the findings, the possible formation mechanism of HNMs from Gly during LED-UV 265 /chlorine disinfection was deduced. Finally, it was demonstrated that the formation laws of HNMs from Gly in real water samples were basically consistent with those in simulated water. Insights obtained in this study help to comprehend the HNMs formation from Gly and provide strategies for controlling the production of HNMs during LED-UV 265 /chlorine disinfection.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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