Effects of Ions on THM Formation During Chlorination of Bromide-Containing Water
2020
Ta, Na | Li, Chenghao | Wang, Yi | An, Wuyun
Disinfection byproducts (DBPs) have attracted extensive attention due to their adverse health effects such as genotoxicity, mutagenicity, and carcinogenicity. With higher formation potential and occurrence in all disinfection processes, trihalomethanes (THMs) are one of the most significant DBPs. Since ions are universally existent by natural or anthropogenic input to groundwater or surface water, the effects of ions (Ca²⁺, Mg²⁺, NH⁺₄, As³⁺, Fe³⁺, Al³⁺, Cu²⁺, and F⁻) on THM formation during chlorination in bromide-containing water were investigated in the present study. The results showed that THM formation and speciation were substantially influenced by the ions, but the degree and mechanisms of effects were critically dependent on the ion species. THM formation was inhibited by Ca²⁺, Mg²⁺, As³⁺, and NH⁺₄ significantly, and was enhanced by Fe³⁺, Cu²⁺, and Al³⁺. The mechanisms of influence of the above ions were interpreted for complexation, consumption, and catalysis. Furthermore, due to the higher Br⁻ concentration, CHBr₃ was the dominant species in THMs.
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