Modeling chloramine decay in full-scale drinking water supply systems

Article

Ricca, Henry, Aravinthan, Vasantha and Gnanamanikam, Mahinthakumar. 2019. "Modeling chloramine decay in full-scale drinking water supply systems." Water Environment Research. 91 (5), pp. 441-454. https://doi.org/10.1002/wer.1046
Article Title

Modeling chloramine decay in full-scale drinking water
supply systems

ERA Journal ID4693
Article CategoryArticle
AuthorsRicca, Henry (Author), Aravinthan, Vasantha (Author) and Gnanamanikam, Mahinthakumar (Author)
Journal TitleWater Environment Research
Journal Citation91 (5), pp. 441-454
Number of Pages14
Year2019
Place of PublicationUnited States
ISSN1061-4303
1554-7531
Digital Object Identifier (DOI)https://doi.org/10.1002/wer.1046
Web Address (URL)https://onlinelibrary.wiley.com/doi/full/10.1002/wer.1046
Abstract

Chloramines are commonly used as secondary disinfectants in drinking water treatment, providing a residual for disinfection as drinking water moves to consumers. Chloramines are inherently unstable, undergoing autodecomposition reactions even in the absence of reactive substances. In the presence of natural organic matter (NOM), chloramine loss accelerates due to additional reaction pathways. In this study, batch reaction models for chloramine loss due to autodecomposition and the presence of NOM were developed. A case study was carried out for the Town of Cary, North Carolina. A hydraulic model of Cary's distribution system was developed and calibrated using the EPANET toolkit with operational and water demand data supplied by Cary. Then, water age from the hydraulic model was used together with the batch model of chloramine decay to successfully predict chloramine concentrations spatially and temporally throughout the network. The capabilities of the EPANET‐MSX toolkit to model chloramine loss in a distribution network are explored.

Keywordschloramine decay; EPANET-MSX; water distribution; water quality modeling
ANZSRC Field of Research 2020401199. Environmental engineering not elsewhere classified
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Byline AffiliationsNorth Carolina State University, United States
School of Civil Engineering and Surveying
Institution of OriginUniversity of Southern Queensland
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