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A suspended growth deammonification process has been in operation for over two years in Austria. Three US utilities have embarked on piloting this process at two locations: New York City and Alexandria, Virginia. Deammonification is a two-part autotrophic reaction involving two distinct biomass populations. In the first step aerobic ammonia oxidizing bacteria (AOB) nitrify partially to produce near equimolar concentrations of nitrite and ammonia. In the second step Anaerobic Ammonia Oxidizing Microorganisms (anammox) autotrophically denitrify these products to nitrogen gas. Alkalinity limitations and ammonia inhibition are used to control the production of near equimolar nitrite and ammonia, while limiting nitrite toxicity is key to facilitating autotrophic denitrification (anammox process). The paper describes the parameters that are important to control single-sludge suspended growth deammonification and how the DEMON process uses pH to control the two key reactions, at the same time controlling residual nitrite levels to prevent nitrite toxicity.
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Document Type: Research Article

Publication date: 2007-01-01

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