PMID: 11318035Apr 25, 2001Paper

Conversion of ammonia to dinitrogen in wastewater by Nitrosomonas europaea

Applied Biochemistry and Biotechnology
N K ShresthaI Okura

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 (NO2-), while under oxygen-limiting or oxygen-free conditions, NO2(-)-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.

Citations

Apr 4, 2014·Chemical Reviews·Luisa B Maia, José J G Moura

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