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Optimizing booster chlorination in water distribution networks: a water quality index approach

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Abstract

The optimization of chlorine dosage and the number of booster locations is an important aspect of water quality management in distribution networks. Booster chlorination helps to maintain uniformity and adequacy of free residual chlorine concentration, essential for safeguarding against microbiological contamination. Higher chlorine dosages increase free residual chlorine concentration but generate harmful by-products, in addition to taste and odor complaints. It is possible to address these microbial, chemical, and aesthetic water quality issues through free residual chlorine concentration. Estimating a water quality index (WQI) based on regulatory chlorine thresholds for microbial, chemical, and aesthetics criteria can help engineers make intelligent decisions. An innovative scheme for maintaining adequate residual chlorine with optimal chlorine dosages and numbers of booster locations was established based on a proposed WQI. The City of Kelowna (BC, Canada) water distribution network served to demonstrate the application of the proposed scheme. Temporal free residual chlorine concentration predicted with EPANET software was used to estimate the WQI, later coupled with an optimization scheme. Preliminary temporal and spatial analyses identified critical zones (relatively poor water quality) in the distribution network. The model may also prove useful for small or rural communities where free residual chlorine is considered as the only water quality criterion.

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Acknowledgments

The authors would like to thank to the City of Kelowna for providing their valuable data and information. The project was funded by the National Science and Engineering Research Council (NSERC) and RES'EAU-WaterNET.

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Authors and Affiliations

  1. School of Engineering, University of British Columbia (Okanagan Campus), EME-3255, 1137 Alumni Ave, Kelowna, BC, V1V 1V7, Canada

    Nilufar Islam

  2. School of Engineering, University of British Columbia (Okanagan Campus), EME-4253, 1137 Alumni Ave, Kelowna, BC, V1V 1V7, Canada

    Rehan Sadiq

  3. École supérieure d’aménagement du territoire et de développement régional, Université Laval, Laval, Quebec, Canada

    Manuel J. Rodriguez

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  1. Nilufar Islam
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Correspondence to Nilufar Islam.

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Islam, N., Sadiq, R. & Rodriguez, M.J. Optimizing booster chlorination in water distribution networks: a water quality index approach. Environ Monit Assess 185, 8035–8050 (2013). https://doi.org/10.1007/s10661-013-3153-z

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