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Applied and Environmental Microbiology, July 1999, p. 3248-3250, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Key Physiology of Anaerobic Ammonium Oxidation

Marc Strous, J. Gijs Kuenen, and Mike S. M. Jetten*

Department of Biotechnology, Delft University of Technology, 2628 BC Delft, The Netherlands

Received 22 December 1998/Accepted 6 April 1999

The physiology of anaerobic ammonium oxidizing (anammox) aggregates grown in a sequencing batch reactor was investigated quantitatively. The physiological pH and temperature ranges were 6.7 to 8.3 and 20 to 43°C, respectively. The affinity constants for the substrates ammonium and nitrite were each less than 0.1 mg of nitrogen per liter. The anammox process was completely inhibited by nitrite concentrations higher than 0.1 g of nitrogen per liter. Addition of trace amounts of either of the anammox intermediates (1.4 mg of nitrogen per liter of hydrazine or 0.7 mg of nitrogen per liter of hydroxylamine) restored activity completely.

* Corresponding author. Mailing address: Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands. Phone: 31-15-2781193. Fax: 31-15-2782355. E-mail: M.Jetten{at}STM.TUDelft.nl.

Applied and Environmental Microbiology, July 1999, p. 3248-3250, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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