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Growth Characteristics of Nitrite Oxidizing Bacteria Isolated from Anaerobic Digestion Liquor  

Jang, Hyun-Min (School of Biotechnology and Environmental Engineering, The Catholic University)
Jang, Jae-Eun (School of Biotechnology and Environmental Engineering, The Catholic University)
Kim, Young-Jun (School of Biotechnology and Environmental Engineering, The Catholic University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.18, no.1, 2010 , pp. 73-80 More about this Journal
Abstract
Two nitrite oxidizing bacteria, NOB1 and NOB2, were isolated from anaerobic digester liquer of food wastewater and analyzed for their growth characteristics and the ability to oxidize nitrite under different temperature, pH, and DO( dissolved oxygen) concentrations. Both of the isolated strains have shown the best growth at pH 7.0 and at $35^{\circ}C$, and also shown higher growth rate with the increasing dissolved oxygen concentrations. As the factors to restrict the growth of these strains, parameters such as pH and DO were found to be effective ones, by increasing (up to 9.0) or decreasing pH (up to 5.0), or lowing DO below 1.0 ppm. Especially, the ability to oxidize nitrite in both strains was about 50% lower in below 1.0 ppm of DO than above of 1.0 ppm. NOB2 was found to be two times greater in both the growth rate and the nitrite-oxidizing ability than NOB1.
Keywords
Partial nitrification; Nitrite oxidizer; Anaerobic digestion liquor; Isolation of Bacteria;
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