Abstract
UV/peroxymonosulfate (UV/PMS) is a promising advanced oxidation technology in water treatment. This study aimed to investigate the impact of UV/PMS on humic acid (HA) and the influence of PMS dosage, pretreatment time, pH pretreatment, nitrate, nitrite, ammonium, and bicarbonate influencing factors on disinfection byproduct (DBP) formation during post-chlorination. With increased PMS dosage or pretreatment time, the UV/PMS treatment significantly reduced ultraviolet absorbance and increased mineralization. It altered the fractional constituent as humic substances were gradually transformed into building blocks and low-molecular-weight acids. However, most DBP formation increased initially and then decreased after subsequent chlorination. Rising nitrate or nitrite concentrations markedly promoted halonitromethane (HNM) formation. The presence of ammonia had a more significant impact on dichloroacetonitrile (DCAN) formation. Bicarbonate in UV/PMS pretreatment increased carbonated disinfection byproduct (C-DBP) formation, whereas it had a negligible impact on nitrogenous disinfection byproduct (N-DBP) formation. The present study revealed the impact of a series of influencing factors on DBP formation in UV/PMS reaction systems, providing comprehensive insights on applying UV/PMS in actual practice.
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Some of data and materials used during this study are available from the corresponding author by request.
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This study was supported by Key Research and Development plan of Shandong Province (2020CXGC011406) and Natural Science Foundation of Shandong Province (ZR2021ME166).
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Lulu Dong: experiment, methodology, data analysis, writing—original draft and editing; Zhenxing Yao: methodology, supervision, writing—reviewing and editing; Shaohua Sun: writing—reviewing and editing; Mingquan Wang: writing—reviewing and editing; Ruibao Jia: writing—reviewing and editing, funding acquisition, project administration. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Dong, L., Yao, Z., Sun, S. et al. Effect of UV/peroxymonosulfate pretreatment on disinfection byproduct (DBP) formation during post-chlorination of humic acid. Environ Sci Pollut Res 31, 422–432 (2024). https://doi.org/10.1007/s11356-023-30908-8
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DOI: https://doi.org/10.1007/s11356-023-30908-8