N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge linearly depends on inorganic carbon concentration

Peng, Lai, Ni, Bing-Jie, Ye, Liu and Yuan, Zhiguo (2015) N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge linearly depends on inorganic carbon concentration. Water Research, 74 58-66. doi:10.1016/j.watres.2015.02.003


Author Peng, Lai
Ni, Bing-Jie
Ye, Liu
Yuan, Zhiguo
Title N2O production by ammonia oxidizing bacteria in an enriched nitrifying sludge linearly depends on inorganic carbon concentration
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2015-05-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2015.02.003
Open Access Status
Volume 74
Start page 58
End page 66
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2016
Language eng
Formatted abstract
The effect of inorganic carbon (IC) on nitrous oxide (N2O) production by ammonia oxidizing bacteria (AOB) was investigated over a concentration range of 0–12 mmol C/L, encompassing typical IC levels in a wastewater treatment reactors. The AOB culture was enriched along with nitrite-oxidizing bacteria (NOB) in a sequencing batch reactor (SBR) to perform complete nitrification. Batch experiments were conducted with continuous carbon dioxide (CO2) stripping or at controlled IC concentrations. The results revealed a linear relationship between N2O production rate (N2OR) and IC concentration (R2 = 0.97) within the IC range studied, suggesting a substantial effect of IC on N2O production by AOB. Similar results were also obtained with an AOB culture treating anaerobic sludge digestion liquor. The fundamental mechanism responsible for this dependency is unclear; however, in agreement with previous studies, it was observed that the ammonia oxidation rate (AOR) was also influenced by the IC concentration, which could be well described by the Monod kinetics. These resulted in an exponential relationship between N2OR and AOR, as previously observed in experiments where AOR was altered by varying dissolved oxygen and ammonia concentrations. It is therefore possible that IC indirectly affected N2OR by causing a change in AOR. The observation in this study indicates that alkalinity (mostly contributed by IC) could be a significant factor influencing N2O production and should be taken into consideration in estimating and mitigating N2O emissions in wastewater treatment systems.
Keyword Ammonia oxidizing bacteria
Exponential relationship
Inorganic carbon
Linear relationship
Nitrous oxide
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 2016 Collection
Advanced Water Management Centre Publications
 
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