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Trihalomethanes monitoring and their seasonal variation in urban municipal water supply system in North India

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Abstract

This study reports the trihalomethanes generated during disinfection within the water distribution network of Delhi, India. For 12 months study period tap water samples were collected (n = 216) from the command areas of nine water treatment plants to provide a comprehensive picture of spatial and seasonal variation of trihalomethanes in the city. The mean concentrations of chloroform, bromodichloromethane, dibromochloromethane, bromoform were 34.62 ± 13.09 μg/l, 25.39 ± 11.75 μg/l, 15.83 ± 9.66 μg/l, 1.74 ± 1.51 μg/l respectively, the total trihalomethanes concentration ranged between 11.41–175.54 μg/l. Chloroform was prevalent accounting 45% in total trihalomethanes followed by bromodichloromethane, dibromochloromethane, bromoform accounting 33%, 20%, and 2% respectively. Trihalomethanes concentrations were found to be increasing during summer season and got decreased in the winter and post-monsoon season. Total trihalomethanes levels were found to be highest at Chandrawal water treatment plant command area (85.35–148.38 μg/l) and lowest at Okhla water treatment plant command area (11.41–63.38 μg/l). In many samples trihalomethanes concentrations were discovered to be higher than the allowable limit specified by Indian Standards. A strong relationship between trihalomethanes formation with total organic carbon (r = 0.934) and residual chlorine (r = 0.801) accentuate its capability for monitoring disinfection by-products in the distribution network. Results showed that considerable levels of trihalomethanes are generated in the study area, therefore the competent authorities must take the appropriate steps to regularly monitor the trihalomethanes in drinking water. The findings of this study may help to provide operators with invaluable information on drinking water quality and open up several chances to enhance water quality management.

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Data availability

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

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Acknowledgements

The authors acknowledge and express there thanks to the administration of Jamia Millia Islamia and are highly thankful for providing the research facilities used in this work.

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The authors declare that no funds, grants, or other support were received for conducting this study.

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Authors

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Mohd. Aamir Mazhar: Investigation, Data Curation, Writing Original Draft, Sirajuddin Ahmed: Conceptualization, Methodology, Resources, Writing Review and Editing, Geeta Singh: Project Administration, Writing Review and Editing, Azhar Husain: Supervision, Writing Review and Editing, Rahisuddin: Formal Analysis, Visualization, Writing Review and Editing. All authors read and approved the final manuscript.

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Correspondence to M. A. Mazhar.

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The authors declare that they have no known competing financial interests or personal relations hips that could have appeared to influence the work reported in this paper.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Editorial responsibility: S. Mirkia.

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Mazhar, M.A., Ahmed, S., Singh, G. et al. Trihalomethanes monitoring and their seasonal variation in urban municipal water supply system in North India. Int. J. Environ. Sci. Technol. (2024). https://doi.org/10.1007/s13762-024-05702-9

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  • DOI: https://doi.org/10.1007/s13762-024-05702-9

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