ID:
publications-1857
Type:
Peer reviewed articles
Year:
2021
Authors:
Joana Costa; Elsa Mesquita; Filipa Ferreira; Maria João Rosa; Rui M. C. Viegas
Title:
Identification and Modelling of Chlorine Decay Mechanisms in Reclaimed Water Containing Ammonia
Venue/Journal:
Sustainability, Vol 13, Iss 13548, p 13548 (2021)
DOI:
10.3390/su132413548
Research type:
Simulation & Modeling
Water System:
Precipitation & Ecological Systems
Technical Focus:
Abstract:
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 8.01×10−5 M (≈5 mg/L) and 2.67×10−4 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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