Abstract
Trihalomethanes (THMs) are a class of disinfection by-products that were proved to have adverse effects to human health. Investigation into its content change and molecular composition variation of its main precursor, which is believed to be dissolved organic matter (DOM) during water purification process, can help understand the formation mechanism of THMs and optimize the processes in drinking water treatment plant (DWTP). This is of great significance to ensure the safety of urban water supply. In this study, detailed changes of THMs’ content and formation potential were determined during the water purification process in summer and winter at a typical DWTP in south China. Specific molecular composition changes of DOM were also characterized by ultrahigh-resolution mass spectrometry, to comprehensively study its correlation with the formation of THMs in different water processing units and seasons. The result showed that chlorination will cause drastic changes of water quality and a sharp increase in the concentration of THMs (18.7 times in summer and 13.9 times in winter). Molecular-level characterization of DOM indicates that a range of lignin-like substance with lower O/C (< 0.5) and H/C (< 1.25) vanished and considerable amount of protein-like and tannins-like substance with higher H/C (> 1.25) and O/C (> 0.5) was formed after chlorination. Analysis of Cl-containing products demonstrated that a bulk of CHOCl1 and CHOCl2 compounds with moderate molecular weights were formed in both winter and summer. However, the newly formed CHOCl1 molecules showed a relatively higher mass weight in summer (> 500 Da) compared to winter (300–500 Da). Seasonal differences also emerged in the result of correlation between the trihalomethanes formation potential and total organic carbon. The correlation coefficient in summer (0.500) was lower than that in winter (0.843). The results suggested that the exhaustive reaction and contribution of DOM to THMs may vary in different seasons.
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Funding
This work was supported by the Guangdong Province Basic and Applied Basic Research Fund Project (2019A1515010382) and Guangdong Academy of Sciences Development Special Fund Project (2019GDASYL-0103022). We thank Dr. Simon Wang at the Language Centre, HKBU, for language polishing.
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Wei Wang contributed to writing original draft, sample collection, formal analysis and investigation. Yanfang Ma contributed to statistical analysis, sample collection and investigation. Yibo Zhou contributed to resources, formal analysis and investigation. Hong Huang contributed to formal analysis and investigation. Wenyuan Dou contributed to manuscript editing and revising, resources and project administration. Bin Jiang contributed to conceptualization, supervision and methodology.
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Wang, W., Ma, Y., Zhou, Y. et al. Investigation into the content and formation of trihalomethanes and molecular change of dissolved organic matter from a typical water plant in south China. Environ Geochem Health 43, 4315–4328 (2021). https://doi.org/10.1007/s10653-021-00917-y
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DOI: https://doi.org/10.1007/s10653-021-00917-y