Potential side effects of using ammonia to inhibit bromate formation during the ozonation of drinking water

Authors: Hofmann, R.; Andrews, R.C.

Source: Journal of Environmental Engineering and Science, Volume 6, Number 6, November 2007 , pp. 739-743(5)

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Abstract:

This note identifies potential side effects of using ammonia to inhibit bromate formation during the ozonation of drinking water, and makes preliminary predictions of their significance. Based on kinetic calculations, it is expected that ammonia would not exert a significant ozone demand and consequently would have little impact on the ozonation process. The ammonia needed to inhibit bromate formation is also not expected to promote nitrification in distribution systems, since the ammonia would either typically be removed through breakpoint chlorination or would be used to form chloramines. However, the impact of ammonia on biologically active filters, which often follow ozonation, is more difficult to evaluate since the issue has not been directly studied, and the role of nitrogen in the biological processes in such an environment is complex. Further, if chlorine were being used for secondary disinfection, any ammonia that persisted in the treated water would exert a demand and would have to be considered.

La présente note identifie les effets nuisibles potentiels d'utiliser de l'ammoniac pour empêcher la formation de bromate durant l'ozonisation de l'eau potable et établit des prévisions préliminaires de leur importance. En se basant sur des calculs cinétiques, l'ammoniac ne devrait pas générer une demande importante en ozone; il aurait donc peu d'impact sur le procédé d'ozonisation. L'ammoniac requis pour empêcher la formation de bromate ne devrait pas faciliter la nitrification des systèmes de distribution puisque l'ammoniac serait normalement éliminé par la chloration au point de remontée ou serait consommé pour former des chloramines. Toutefois, l'impact de l'ammoniac sur les filtres biologiquement actifs, qui suivent souvent le procédé d'ozonisation, est plus difficile à évaluer puisque cette question n'a pas été directement examinée et que le rôle de l'azote est complexe dans les procédés biologiques dans un tel environnement. De plus, si du chlore était utilisé pour la désinfection secondaire, tout ammoniac restant dans l'eau traitée entrainerait une demande et ce phénomène devra être examiné.

Document Type: Research article

Publication date: 2007-11-01

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Since January 2002, NRC Research Press has published the Journal of Environmental Engineering and Science. During the seven-year history of the journal, the co-editors, Dr. Donald S. Mavinic and Dr. Daniel W. Smith, built a high-quality journal that was well respected by its community of researchers in Canada and around the world. The last issues of the Journal of Environmental Engineering and Science was published in November 2008 together with a supplement.

Potential side effects of using ammonia to inhibit bromate formation during the ozonation of drinking water

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