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Monochloramine Decay for Two Chlorine to Ammonia Ratios in Bulk Water

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Within the context of the treatment of tap water as a research objective, a bulk model has been developed to describe chloramines decay for chlorine to ammonia ratios of 3:1 and 4:1. The model is based on studies of isolated individual reactions and also concerning the chloramines decay as a whole. The experimental results were used to estimate and verify the model for use in actual drinking water distribution systems under various chloramines conditions. The overall model formulation works reasonably well in describing chloramines decay in bulk water containing natural organic matter (NOM) and nitrite over a variety of reaction conditions. The data show that the auto-decomposition rate of chloramines is faster in the presence of NOM in bulk water for a chlorine to ammonia ratio (Cl:N) of 3:1 versus 4:1. In contrast, the decay rate caused by nitrite is independent of the Cl:N ratio. The decay rate increases with the NOM and nitrite concentrations and the temperature, but decreases with increasing pH. The effect of higher temperature on chloramines loss was more marked at the 3:1 Cl:N ratio.
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Keywords: bulk decay model; chloramines decay; chlorine to ammonia (Cl:N) ratio; decay coefficient

Document Type: Research Article

Publication date: 2013-11-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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