Department of Environmental Sciences

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Seminar Abstracts
Environmental Sciences Seminar Abstract            

  Development of Anaerobic Ammonium Oxidation (ANAMMOX) Based Processes for Ammonium Removal in Wastewater and Landfill Leachate Treatment Systems
Greg Bowden
AECOM Water, New York

Deammonification is a biological process that can greatly reduce the energy and chemical consumption associated with ammonium removal from municipal and industrial wastewaters and landfill leachate. The process consists of two steps: the partial oxidation of ammonia to nitrite (Nitritation) by aerobic autotrophic ammonia oxidizing bacteria (AOB) followed by the anaerobic oxidation of the residual ammonia by nitrite to nitrogen gas. The latter reaction is performed by a community of anaerobic autotrophic ammonia oxidizing (ANAMMOX) bacteria, which were not identified until the late 1990s, but are now known to exist in numerous environments including bioreactors in wastewater treatment facilities. The application of engineered Nitritation/ANAMMOX-based bioreactor systems in large-scale facilities has been limited to date to the treatment of wastewaters containing a high ammonium concentration (> 500 mg/L) such as landfill leachate. A review of the these processes will be provided along with a discussion of the technical challenges that must be overcome if they are to be used in the treatment of wastewaters containing a substantially lower ammonium concentration (e.g. < 30 mg/L, which is typical of a municipal wastewater).

Last updated: 11/24/2008