Conversion of ammonia to dinitrogen in wastewater by Nitrosomonas europaea |
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| Authors: | Niranjan Kumar Shrestha Shigeru Hadano Toshiaki Kamachi Ichiro Okura |
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| Institution: | (1) Department of Bioengineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, 226-8501 Yokohama, Japan;(2) Environmental Systems Division, Environmental & Agricultural Plant, Engineering & Construction, Toshiba Plant Kensetsu, 5-37-1 Kamata, Ota-ku, 144-8721 Tokyo, Japan |
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| Abstract: | Because Nitrosomonas europaea contains ammonia-oxidizing enzyme, nitrite reductase, and nitrous oxide reductase, the conversion of ammonia to dinitrogen
was tried with different reaction conditions. In aerobic reaction conditions, ammonium was converted to nitrite (NO
2
−
), while under oxygen-limiting or oxygen-free conditions, NO
2
−
-N formed from ammonia oxidation by N. europaea was reduced to N2O and dinitrogen with 22% conversion. During denitrification, optimal pH for the production of N2O and dinitrogen was found to be 7.0–8.0. Dinitrogen was not produced in acidic pH<7.0. A low partial oxygen pressure as well
as oxygen-free conditions are favorable for high production of dinitrogen. |
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| Keywords: | Denitrification dinitrogen nitrous oxide nitrification Nitrosomonas europaea |
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