Decreased bromate formation but inadvertently increased toxicity in the chloramination-ozonation process: Essential roles of halamines in generating halogenated and nitrogenous byproducts

Water Research, Journal Year: 2025, Volume and Issue: 283, P. 123786 - 123786

Published: May 5, 2025

Language: Английский

Increased Toxicity toward Mammalian Cells in the Periodate Oxidation Process of Wastewater: The Overlooked Formation of Noniodinated but Nitrogenous Byproducts

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 5, 2024

Periodate (PI) shows promising potential as an oxidant for wastewater treatment; however, its impact on the toxicity of remains unknown. Here, we found that with 100 μM PI addition, cytotoxicity increased from 4.8 to 7.6 mg-Phenol/L 9.5 12.8 mg-Phenol/L, and genotoxicity 0.3 0.9 μg-4-NQO/L. Interestingly, hypoiodous acid (HOI) was not detected during reaction, there no observed increase in concentration total organic iodine (TOI). CHON components dissolved matter changed most obviously oxidation, which might serve primary precursors toxic byproducts. Cytotoxicity typical nitrogen-containing tryptophan, lysine, phenylalanine, tyrosine after oxidation 14.7, 2.4, 4.1, 3.2 respectively. four nonhalogenated aromatic nitrogenous byproducts (N-DBPs) 3-hydroxyquinoline, 4-hydroxyquinoline, benzopyridine, benzopyrrole were confirmed using standards, such 2-formylbenzonitrile tentatively proposed. The comparable those known N-DBPs nitrosamines, suggesting attention should be given these but two PI-treated samples concentrations 0.8, 0.98, 0.52, 0.0038, 18.28, 1.50, 0.57, 0.0074 μg/L, respectively, contributions less than 1.5% overall cytotoxicity. Further investigations are warranted elucidate drivers wastewater.

Language: Английский

Formation and estimated cytotoxicity of trihalomethanes and haloacetic acids during ozonation of nonylphenol in bromide-containing water after chlorination process: Impact of ozonation initial pH

Toxicology Reports, Journal Year: 2024, Volume and Issue: 13, P. 101769 - 101769

Published: Oct. 18, 2024

Language: Английский