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Identification and Modelling of Chlorine Decay Mechanisms in Reclaimed Water Containing Ammonia

Joana Costa / Elsa Mesquita / Filipa Ferreira / Maria João Rosa / Rui M. C. Viegas

Keeping an effective disinfectant residual concentration in reclaimed water is still a challenge, due to its high levels of ammonia and organic matter when compared with those in drinking water. This research proposes the integration of the reaction schemes of monochloramine auto-decomposition with an empirical kinetic mechanism accounting for reactive chlorine species decay in the presence of organic matter, for which three mechanisms were hypothesized and tested. A parallel second order mechanism, where monochloramine reacts both with fast and slow organic matter reactive fractions, was identified as the most suitable. The model, comprising two rate constants and two fictive concentrations of organic matter as parameters, was further successfully calibrated with real reclaimed waters with two initial free chlorine doses of $8.01 \times 10^{- 5}$ M (≈5 mg/L) and $2.67 \times 10^{- 4}$ M (≈20 mg/L). The proposed model is believed to support future studies aiming to predict and manage chlorine decay in reclaimed water distribution systems.

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Identification and Modelling of Chlorine Decay Mechanisms in Reclaimed Water Containing Ammonia

Joana Costa / Elsa Mesquita / Filipa Ferreira / Maria João Rosa / Rui M. C. Viegas

Keeping an effective disinfectant residual concentration in reclaimed water is still a challenge, due to its high levels of ammonia and organic matter when compared with those in drinking water. This research proposes the integration of the reaction schemes of monochloramine auto-decomposition with an empirical kinetic mechanism accounting for reactive chlorine species decay in the presence of organic matter, for which three mechanisms were hypothesized and tested. A parallel second order mechanism, where monochloramine reacts both with fast and slow organic matter reactive fractions, was identified as the most suitable. The model, comprising two rate constants and two fictive concentrations of organic matter as parameters, was further successfully calibrated with real reclaimed waters with two initial free chlorine doses of $8.01 \times 10^{- 5}$ M (≈5 mg/L) and $2.67 \times 10^{- 4}$ M (≈20 mg/L). The proposed model is believed to support future studies aiming to predict and manage chlorine decay in reclaimed water distribution systems.

Identification and Modelling of Chlorine Decay Mechanisms in Reclaimed Water Containing Ammonia

Joana Costa / Elsa Mesquita / Filipa Ferreira / Maria João Rosa / Rui M. C. Viegas

Keeping an effective disinfectant residual concentration in reclaimed water is still a challenge, due to its high levels of ammonia and organic matter when compared with those in drinking water. This research proposes the integration of the reaction schemes of monochloramine auto-decomposition with an empirical kinetic mechanism accounting for reactive chlorine species decay in the presence of organic matter, for which three mechanisms were hypothesized and tested. A parallel second order mechanism, where monochloramine reacts both with fast and slow organic matter reactive fractions, was identified as the most suitable. The model, comprising two rate constants and two fictive concentrations of organic matter as parameters, was further successfully calibrated with real reclaimed waters with two initial free chlorine doses of $8.01 \times 10^{- 5}$ M (≈5 mg/L) and $2.67 \times 10^{- 4}$ M (≈20 mg/L). The proposed model is believed to support future studies aiming to predict and manage chlorine decay in reclaimed water distribution systems.

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Title:

Identification and Modelling of Chlorine Decay Mechanisms in Reclaimed Water Containing Ammonia

Contributors:

Joana Costa (author) / Elsa Mesquita (author) / Filipa Ferreira (author) / Maria João Rosa (author) / Rui M. C. Viegas (author)

Published in:

Sustainability, Vol 13, Iss 24, p 13548 (2021)

Publication date:

2021

ISSN:

DOI:

https://doi.org/10.3390/su132413548

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

Keywords:

reclaimed water distribution systems , urban water reuse , disinfection , chlorine decay , monochloramine , organic matter , Environmental effects of industries and plants , TD194-195 , Renewable energy sources , TJ807-830 , Environmental sciences , GE1-350

Metadata by DOAJ is licensed under CC BY-SA 1.0

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