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Received September 2, 2004
Accepted November 15, 2004
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Effects of Free Ammonia and Dissolved Oxygen on Nitrification and Nitrite Accumulation in a Biofilm Airlift Reactor
Department of Environmental System Engineering, Hallym University, 1 Okchon, Chunchon, Kangwon 200-702, Korea 1Department of Environment and Bioengineering, Myungji University, Yongin, Kyunggi 449-728, Korea
Korean Journal of Chemical Engineering, January 2005, 22(1), 85-90(6), 10.1007/BF02701467
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Abstract
The purpose of this research is to find out the effects of free ammonia concentration and dissolved oxygen on nitrification and nitrite accumulation in a biofilm airlift reactor. Free ammonia seriously inhibited the activity of nitrite oxidizers at the concentration higher than 0.1 mg NH3-N/L and it was very effective for nitrite accumulation. Dissolved oxygen limitation in the biofilm also caused nitrite accumulation. Long term inhibition decreased the growth rate for nitrite oxidizers, and ammonia oxidizers were the dominant nitrifiers in the wastewater nitrification. Selective accumulation of ammonia oxidizers in the biofilm could be another reason for nitrite accumulation. Free ammonia inhibited nitrite oxidizers immediately, and adaptation to free ammonia was not observed. Therefore, the optimum control of free ammonia and dissolved oxygen concentration is critical for nitrite accumulation and the strategy can be used for selective accumulation of ammonia oxidizers in a bioreactor system.
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Villaverde S, Garcia-Encina PA, Fdz-Polanco F, Water Res., 31, 1180 (1997)
Vogelsang C, Schramm A, Picioreanu C, VanLoosdrecht MCM, Ostgaard K, Hydrobiologia, 469, 165 (2002)
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Yoon HJ, "A Study of the Nitrogen Removal Characteristics via Nitrite Accumulation of Biofilm Reactor System", M. S. Thesis, Hallym Univ., Chuncheon (2002)
