Evaluating four mathematical models for nitrous oxide production by autotrophic ammonia-oxidizing bacteria

Ni, Bing-Jie, Yuan, Zhiguo, Chandran, Kartik, Vanrolleghem, Peter A. and Murthy, Sudhir (2013) Evaluating four mathematical models for nitrous oxide production by autotrophic ammonia-oxidizing bacteria. Biotechnology and Bioengineering, 110 1: 153-163. doi:10.1002/bit.24620

Author Ni, Bing-Jie
Yuan, Zhiguo
Chandran, Kartik
Vanrolleghem, Peter A.
Murthy, Sudhir
Title Evaluating four mathematical models for nitrous oxide production by autotrophic ammonia-oxidizing bacteria
Journal name Biotechnology and Bioengineering   Check publisher's open access policy
ISSN 0006-3592
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1002/bit.24620
Volume 110
Issue 1
Start page 153
End page 163
Total pages 11
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2013
Language eng
Formatted abstract
There is increasing evidence showing that ammonia-oxidizing bacteria (AOB) are major contributors to N2O emissions from wastewater treatment plants (WWTPs). Although the fundamental metabolic pathways for N2O production by AOB are now coming to light, the mechanisms responsible for N2O production by AOB in WWTP are not fully understood. Mathematical modeling provides a means for testing hypotheses related to mechanisms and triggers for N2O emissions in WWTP, and can then also become a tool to support the development of mitigation strategies. This study examined the ability of four mathematical model structures to describe two distinct mechanisms of N2O production by AOB. The production mechanisms evaluated are (1) N2O as the final product of nitrifier denitrification with NO2 - as the terminal electron acceptor and (2) N2O as a byproduct of incomplete oxidation of hydroxylamine (NH2OH) to NO2 -. The four models were compared based on their ability to predict N2O dynamics observed in three mixed culture studies. Short-term batch experimental data were employed to examine model assumptions related to the effects of (1) NH4 + concentration variations, (2) dissolved oxygen (DO) variations, (3) NO2 - accumulations and (4) NH2OH as an externally provided substrate. The modeling results demonstrate that all these models can generally describe the NH4 +, NO2 -, and NO3 - data. However, none of these models were able to reproduce all measured N2O data. The results suggest that both the denitrification and NH2OH pathways may be involved in N2O production and could be kinetically linked by a competition for intracellular reducing equivalents. A unified model capturing both mechanisms and their potential interactions needs to be developed with consideration of physiological complexity.
Keyword Ammonia-oxidizing bacteria
Mathematical model
Nitrifier denitrification
Nitrous oxide
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 10 August 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
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