Reducing N2O emission from a domestic-strength nitrifying culture by free nitrous acid-based sludge treatment

Wang, Dongbo, Wang, Qilin, Laloo, Andrew Elohim and Yuan, Zhiguo (2016) Reducing N2O emission from a domestic-strength nitrifying culture by free nitrous acid-based sludge treatment. Environmental Science and Technology, 50 14: 7425-7433. doi:10.1021/acs.est.6b00660


Author Wang, Dongbo
Wang, Qilin
Laloo, Andrew Elohim
Yuan, Zhiguo
Title Reducing N2O emission from a domestic-strength nitrifying culture by free nitrous acid-based sludge treatment
Formatted title
Reducing N2O emission from a domestic-strength nitrifying culture by free nitrous acid-based sludge treatment
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 1520-5851
0013-936X
Publication date 2016-07-19
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acs.est.6b00660
Open Access Status Not Open Access
Volume 50
Issue 14
Start page 7425
End page 7433
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2017
Language eng
Formatted abstract
An increase of nitrite in the domestic-strength range is generally recognized to stimulate nitrous oxide (N2O) production by ammonia-oxidizing bacteria (AOB). It was found in this study, however, that N2O emission from a mainstream nitritation system (cyclic nitrite = 25–45 mg of N/L) that was established by free nitrous acid (FNA)-based sludge treatment was not higher but much lower than that from the initial nitrifying system with full conversion of NH4+-N to NO3-N. Under dissolved oxygen (DO) levels of 2.5–3.0 mg/L, N2O emission from the nitritation stage was 76% lower than that from the initial stage. Even when the DO level was reduced to 0.3–0.8 mg/L, N2O emission from the nitritation stage was still 40% lower. An investigation of the mechanism showed that FNA treatment caused a shift of the stimulation threshold of nitrite on N2O emission. At the nitritation stage, the maximal N2O emission factor occurred at ∼16 mg of N/(L of nitrite). However, it increased with increasing nitrite in the range of 0–56 mg of N/L at the initial stage. FNA treatment decreased the biomass-specific N2O production rate, suggesting that the enzymes relevant to nitrifier denitrification were inhibited. Microbial analysis revealed that FNA treatment decreased the microbial community diversity but increased the abundances of AOB and denitrifiers.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
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