Abstract
Nitrous Oxide (N2O) Reduction by Denitrifying Bacteria: Relating Kinetics and Gene ExpressionNitrous oxide is a potent greenhouse gas that can be formed in wastewater treatment, and there is increasing interest in its fate in treatment processes. In this research, kinetic parameters and denitrification-gene expression levels were determined for Paracoccus pantotrophus, a common denitrifying bacterium. Batch tests were carried out with acetate as an electron donor and nitrate (NO3−), nitrite (NO2 −), or nitrous oxide (N2O) as electron acceptors. Tests also addressed concurrent growth on NO3− + N2O and NO2 − + N2O. The maximum specific growth rate μ for N2O was lower than that for NO3− or NO2 −. However, the maximum specific utilization rate q for N2O was 4.4 gN gCOD−1 d−1, compared to only 0.89 gN gCOD−1 d−1 for NO2 − reduction to...Author(s)J.P. PavissichB.L. Read-DailyK. SandbergF. SabbaR. NerenbergSourceProceedings of the Water Environment FederationDocument typeConference PaperPublisherWater Environment FederationPrint publication date Sep, 2012ISSN1938-6478DOI10.2175/193864712811708211Volume / Issue2012 / 12Content sourceWEFTECCopyright2012Word count300
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