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Author Read-Daily, B.L.; Sabba, F.; Pavissich, J.P.; Nerenberg, R.
Title Kinetics of nitrous oxide (N2O) formation and reduction by Paracoccus pantotrophus Type
Year 2016 Publication Amb Express Abbreviated Journal AMB Express
Volume 6 Issue Pages 7 pp
Keywords Paracoccus pantotrophus; Nitrous oxide; Denitrification; Maximum specific reduction rates; Kinetics
Abstract Nitrous oxide (N2O) is a powerful greenhouse gas emitted from wastewater treatment, as well as natural systems, as a result of biological nitrification and denitrification. While denitrifying bacteria can be a significant source of N2O, they can also reduce N2O to N-2. More information on the kinetics of N2O formation and reduction by denitrifying bacteria is needed to predict and quantify their impact on N2O emissions. In this study, kinetic parameters were determined for Paracoccus pantotrophus, a common denitrifying bacterium. Parameters included the maximum specific reduction rates, (q) over cap, growth rates, (mu) over cap, and yields, Y, for reduction of NO3- (nitrate) to nitrite (N2O-), N2O- to N2O, and N2O to N-2, with acetate as the electron donor. The (q) over cap values were 2.9 gN gCOD(-1) d(-1) for NNO3- to NO2-, 1.4 gN gCOD(-1) d(-1) for N2O-to N2O, and 5.3 gN gCOD(-1) d(-1) for N2O to N-2. The (mu) over cap values were 2.7, 0.93, and 1.5 d(-1), respectively. When N2O and NO3- were added concurrently, the apparent (extant) kinetics, (q) over cap (app), assuming reduction to N-2, were 6.3 gCOD gCOD(-1) d(-1), compared to 5.4 gCOD gCOD(-1) d(-1) for NO3- as the sole added acceptor. The (mu) over cap (app) was 1.6 d(-1), compared to 2.5 d(-1) for NO3- alone. These results suggest that NO3- and N2O were reduced concurrently. Based on this research, denitrifying bacteria like P. pantotrophus may serve as a significant sink for N2O. With careful design and operation, treatment plants can use denitrifying bacteria to minimize N2O emissions.
Address [Read-Daily, B. L.] Elizabethtown Coll, Dept Engn & Phys, Elizabethtown, PA 17022 USA, Email: rnerenbe@nd.edu
Corporate Author Thesis
Publisher Biomed Central Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2191-0855 ISBN Medium
Area Expedition Conference
Notes WOS:000384497400004 Approved
Call Number UAI @ eduardo.moreno @ Serial 661
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