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• W3111225316 abstract "• Speciation and decay kinetics of chloramines during UV irradiation was studied. • Chloramine speciation was found strongly dependent on solution pH and Cl 2 /NH 3 ratios. • NCl 3 showed the fastest depletion with a quantum yield of 2.16 mol E −1 . • NH 2 Cl, NHCl 2 and NCl 3 were found more stable at lower temperature (< 15 °C). • Concentrations of disinfection-by products were increased post UV irradiation. Disinfection by-products (DBPs) such as chloramines, haloacetic acids (HAAs) and trihalomethane (THMs) are frequently detected in water and wastewater systems and their excess concentration can be detrimental to human health and many industrial operations. Therefore, it is imperative to evaluate their formation and speciation and decay kinetics in subsequent disinfection processes like UV treatment. UV Photodecay of monochloramine (NH 2 Cl), dichloramine (NHCl 2 ) and trichloramine (NCl 3 ) and decay kinetics of these compounds were assessed at different environmental conditions in synthetic and brine solutions. Results showed that the chloramine fractions and speciation were strongly dependent on solution pH and chlorine to ammonia molar ratios. Among the chloramines, NCl 3 showed the fastest depletion with a quantum yield of 2.16 mol E −1 . Kinetics study showed that the rate of photodecay and quantum yield of NCl 3 was 8-times and 13-times higher than NHCl 2 and NH 2 Cl, respectively. Addition of natural organic matter lead to formation of DBPs like THMs and HAAs in reaction mixture and the concentration of DBPs was found to increase post UV irradiation. DBP concentrations in present study were well below the regulatory value provided by US Environmental Protection Agency (US EPA). This investigation provides a better understanding of chloramine decay kinetics and aids in identification of DBPs that can potentially discharged from treatment plants employing UV photolysis." @default.
• W3111225316 created "2020-12-21" @default.
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• W3111225316 date "2021-04-01" @default.
• W3111225316 modified "2023-10-17" @default.
• W3111225316 title "Photodecay of inorganic chloramines and disinfection by-products in synthetic and brine solution using UV irradiation" @default.
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• W3111225316 doi "https://doi.org/10.1016/j.jwpe.2020.101807" @default.
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