Nitric oxide and nitrous oxide emissions from a full-scale activated sludge anaerobic/anoxic/oxic process

Wang, Yayi, Lin, Ximao, Zhou, Dong, Ye, Liu, Han, Haicheng and Song, Chengkang (2016) Nitric oxide and nitrous oxide emissions from a full-scale activated sludge anaerobic/anoxic/oxic process. Chemical Engineering Journal, 289 330-340. doi:10.1016/j.cej.2015.12.074


Author Wang, Yayi
Lin, Ximao
Zhou, Dong
Ye, Liu
Han, Haicheng
Song, Chengkang
Title Nitric oxide and nitrous oxide emissions from a full-scale activated sludge anaerobic/anoxic/oxic process
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
1873-3212
Publication date 2016-04-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.cej.2015.12.074
Open Access Status Not Open Access
Volume 289
Start page 330
End page 340
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Both nitric oxide (NO) and nitrous oxide (N2O) have strong negative effects on the environment. Although N2O emissions in wastewater water treatment plants (WWTPs) have been widely studied, the concurrence of NO and N2O emissions has not been well characterized, and their emission status from WWTPs in China is still not clear. In this study, online NO and N2O analyzers were used to investigate spatial and temporal variations of NO and N2O emissions in a full-scale activated sludge anaerobic/anoxic/oxic (A2/O) process over one year. The amoA gene of ammonia oxidation bacteria and the nosZ gene of denitrifiers were analyzed to identify possible NO and N2O production pathways. The emission factors of NO and N2O in the studied A2/O process were 0.01±0.006% (0.002-0.021%) and 1.29±1.07% (0.095-3.44%) of the nitrogen load, respectively. Both NO and N2O were mainly emitted from the oxic zone, with emitting levels increasing greatly from the initial oxic zone to the zone end. The N2O emission pattern closely resembled that of NO emissions, but the emission amounts were 2-3 magnitudes higher than that of NO. Nitrite accumulation directly triggered NO and N2O production. This study provides novel insights into emission characteristics and the production pathways of both NO and N2O from a full-scale A2/O process, which is of great significance toward development of effective mitigation strategies for NO and N2O emissions from WWTPs
Keyword A2/O process
AmoA genes
Nitric oxide
Nitrous oxide emissions
Temporal and spatial dynamic
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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