Modeling electron competition among nitrogen oxides reduction and N 2O accumulation in denitrification

Pan, Yuting, Ni, Bing-Jie and Yuan, Zhiguo (2013) Modeling electron competition among nitrogen oxides reduction and N 2O accumulation in denitrification. Environmental Science and Technology, 47 19: 11083-11091. doi:10.1021/es402348n


Author Pan, Yuting
Ni, Bing-Jie
Yuan, Zhiguo
Title Modeling electron competition among nitrogen oxides reduction and N 2O accumulation in denitrification
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2013-10-01
Year available 2013
Sub-type Article (original research)
DOI 10.1021/es402348n
Volume 47
Issue 19
Start page 11083
End page 11091
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2014
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract Competition for electrons among different steps of denitrification has previously been shown to occur, and to play an important role in the accumulation and emission of N2O in wastewater treatment. However, this electron competition is not recognized in the current denitrification models, limiting their ability to predict N2O accumulation during denitrification. In this work, a new denitrification model is developed for wastewater treatment processes. It describes electron competition among the four steps of denitrification, through modeling the carbon oxidation and nitrogen reduction processes separately, in contrast to the existing models that directly couple these two types of processes. Electron carriers are introduced to link carbon oxidation, which donates electrons to carriers, and nitrogen oxides reduction, which receives electrons from these carriers. The relative ability of each denitrification step to compete for electrons is modeled through the use of different affinity constants with reduced carriers. Model calibration and validation results demonstrate that the developed model is able to reasonably describe the nitrate, nitrite, and N2O reduction rates of a methanol-utilizing denitrifying culture under various carbon and nitrogen oxides supplying conditions. The model proposed, while subject to further validation, is expected to enhance our ability to predict N2O accumulation in denitrification.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
 
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