Evaluating mathematical models for N2O production by ammonia-oxidising bacteria: towards a unified model

Ni, Bing-Jie, Yuan, Zhiguo, Chandran, Kartik, Vanrolleghem, Peter A. and Murthy, Sudhir (2012). Evaluating mathematical models for N2O production by ammonia-oxidising bacteria: towards a unified model. In: Conference Proceedings: 3rd IWA/WEF Wastewater Treatment Modelling Seminar, WWTmod 2012. 3rd Wastewater Treatment Modelling Seminar (WWTmod2012), Mont-Sainte-Anne, Quebec, Canada, (63-80). 26-28 February 2012.

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Name Description MIMEType Size Downloads
Author Ni, Bing-Jie
Yuan, Zhiguo
Chandran, Kartik
Vanrolleghem, Peter A.
Murthy, Sudhir
Title of paper Evaluating mathematical models for N2O production by ammonia-oxidising bacteria: towards a unified model
Formatted title
Evaluating mathematical models for N2O production by ammonia-oxidising bacteria: towards a unified model
Conference name 3rd Wastewater Treatment Modelling Seminar (WWTmod2012)
Conference location Mont-Sainte-Anne, Quebec, Canada
Conference dates 26-28 February 2012
Proceedings title Conference Proceedings: 3rd IWA/WEF Wastewater Treatment Modelling Seminar, WWTmod 2012
Place of Publication London, United Kingdom
Publisher International Water Association
Publication Year 2012
Sub-type Fully published paper
Start page 63
End page 80
Total pages 18
Collection year 2013
Language eng
Formatted Abstract/Summary
There is increasi ng evidence showing that ammonia oxidizing bacteria (AOB) are major contributors to N20 emissions from wastewater treatment plants (WWTPs). However, the mechan.isms responsible for N20 production by AOB are not fully understood. Mathematical modelling provides a means for testing hypotheses related to mechanisms, 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, with the aim to develop a unified model. The production mechanisms evaluated are (l)
nitrifier denitrification with No2- as terminal electron acceptor and (2) the byproduct of the incomplete oxidation of hydroxylamine (NH20 H) to N02 • The four models were compared based on their ability to predict N20 dynamics observed in three mixed culture studies. Shon-tem1 batch experimental data were employed to examine model assumptions related to the (I) production of N20 due to NH; increase, (2) production of N20 due to di"olved oxygen (DO) variations, (3) N20 dependency on No,· accumulations and (4) production of N20 with NH20H as an externally provided substrate. The modelling results demonstrate that almost all of these models can
generally describe the NH4, N02 and NO3; data. However, none of these models were able to reproduce all measured N20 data. The result' suggest that both the denitrification and NH20H pathways may be involved in N20 production. Therefore, a unified model used to predict N20 production should provide the ability to capture both  mechanisms independently.
Keyword Ammonia oxidizing bacteria
Hydroxylamine
Mathematical Model
Mechanisms
Nitrifer denitrification
Nitrous oxide
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: Non HERDC
Advanced Water Management Centre Publications
 
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Created: Tue, 31 Jan 2012, 12:50:02 EST by Bing-Jie Ni on behalf of Advanced Water Management Centre