Dinitrogen production from ammonia by Nitrosomonas europaea

被引:37
作者
Shrestha, NK
Hadano, S
Kamachi, T
Okura, I [1 ]
机构
[1] Tokyo Inst Technol, Dept Bioengn, Midori Ku, Yokohama, Kanagawa 2268501, Japan
[2] Toshiba Plant Kensetsu Co Ltd, Environm Syst Div, Ota Ku, Tokyo 1448721, Japan
关键词
nitrification; denitrification; dinitrogen; Nitrosomonas europaea;
D O I
10.1016/S0926-860X(02)00279-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, the conversion efficiency and optimal conditions of successive nitrification and denitrification were assessed for Nitrosomonas europaea, which uses ammonia monooxygenase (AMO), nitrite reductase and nitrous oxide reductase. In aerobic conditions, the first step of nitrification (i.e. NH4+ --> NO2-) occurred; under oxygen-limiting or oxygen free-conditions, however, there was denitrification, whereby nitrous oxide and dinitrogen were produced from nitrite (NO2-). About 7% of the total ammonium was converted to dinitrogen following the successive nitrification and denitrification by N. europaea. During nitrification and denitrification, the optimal pH range for the production of nitrite and dinitrogen was found to be 7.0-8.0. A low partial oxygen pressure or oxygen-free conditions were favorable for the production of dinitrogen. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:33 / 39
页数:7
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