The effect of dissolved oxygen on N2O production by ammonia-oxidizing bacteria in an enriched nitrifying sludge

Peng, Lai, Ni, Bing-Jie, Erler, Dirk, Ye, Liu and Yuan, Zhiguo (2014) The effect of dissolved oxygen on N2O production by ammonia-oxidizing bacteria in an enriched nitrifying sludge. Water Research, 66 12-21. doi:10.1016/j.watres.2014.08.009

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Author Peng, Lai
Ni, Bing-Jie
Erler, Dirk
Ye, Liu
Yuan, Zhiguo
Title The effect of dissolved oxygen on N2O production by ammonia-oxidizing bacteria in an enriched nitrifying sludge
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.08.009
Open Access Status
Volume 66
Start page 12
End page 21
Total pages 10
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2015
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract Dissolved oxygen (DO) is commonly recognized as an important factor influencing nitrous oxide (N2O) production by ammonia-oxidizing bacteria (AOB). However, it has been difficult to separate the true effect of DO from that of nitrite, as DO variation often affects nitrite accumulation. The effect of DO on N2O production by an enriched nitrifying sludge, consisting of both AOB and nitrite-oxidizing bacteria (NOB), was investigated in this study. Nitrite accumulation was minimised by augmenting nitrite oxidation through the addition of an enriched NOB sludge. It was demonstrated that the specific N2O production rate increased from 0 to 1.9±0.09 (n=3) mg N2O-N/hr/g VSS with an increase of DO concentration from 0 to 3.0mg O2/L, whereas N2O emission factor (the ratio between N2O nitrogen emitted and the ammonium nitrogen converted) decreased from 10.6±1.7% (n=3) at DO=0.2mg O2/L to 2.4±0.1% (n=3) at DO=3.0mg O2/L. The site preference measurements indicated that both the AOB denitrification and hydroxylamine (NH2OH) oxidation pathways contributed to N2O production, and DO had an important effect on the relative contributions of the two pathways. This finding is supported by analysis of the process data using an N2O model describing both pathways. As DO increased from 0.2 to 3.0mg O2/L, the contribution of AOB denitrification decreased from 92% - 95%-66% - 73%, accompanied by a corresponding increase in the contribution by the NH2OH oxidation pathway.
Keyword Ammonia oxidizing bacteria
Dissolved oxygen
Model
Nitrous oxide
Pathways
Site preference
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
Advanced Water Management Centre Publications
 
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