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Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor

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Title: Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor
Authors: Rathnayake, R.M.L.D Browse this author
Song, Y. Browse this author
Tumendelger, A. Browse this author
Oshiki, M. Browse this author
Ishii, S. Browse this author
Satoh, Hisashi Browse this author →KAKEN DB
Toyoda, S. Browse this author
Yoshida, N. Browse this author
Okabe, S. Browse this author
Keywords: Nitrous oxide production pathway
Sequencing batch reactor
Isotopomer analysis
In situ hybridization
Issue Date: Dec-2013
Publisher: Elsevier
Journal Title: Water Research
Volume: 47
Issue: 19
Start Page: 7078
End Page: 7086
Publisher DOI: 10.1016/j.watres.2013.07.055
PMID: 24200002
Abstract: Emission of nitrous oxide (N2O) during biological wastewater treatment is of growing concern since N2O is a major stratospheric ozone-depleting substance and an important greenhouse gas. The emission of N2O from a lab-scale granular sequencing batch reactor (SBR) for partial nitrification (PN) treating synthetic wastewater without organic carbon was therefore determined in this study, because PN process is known to produce more N2O than conventional nitrification processes. The average N2O emission rate from the SBR was 0.32 ± 0.17 mg-N L−1 h−1, corresponding to the average emission of N2O of 0.8 ± 0.4% of the incoming nitrogen load (1.5 ± 0.8% of the converted NH4+). Analysis of dynamic concentration profiles during one cycle of the SBR operation demonstrated that N2O concentration in off-gas was the highest just after starting aeration whereas N2O concentration in effluent was gradually increased in the initial 40 min of the aeration period and was decreased thereafter. Isotopomer analysis was conducted to identify the main N2O production pathway in the reactor during one cycle. The hydroxylamine (NH2OH) oxidation pathway accounted for 65% of the total N2O production in the initial phase during one cycle, whereas contribution of the NO2− reduction pathway to N2O production was comparable with that of the NH2OH oxidation pathway in the latter phase. In addition, spatial distributions of bacteria and their activities in single microbial granules taken from the reactor were determined with microsensors and by in situ hybridization. Partial nitrification occurred mainly in the oxic surface layer of the granules and ammonia-oxidizing bacteria were abundant in this layer. N2O production was also found mainly in the oxic surface layer. Based on these results, although N2O was produced mainly via NH2OH oxidation pathway in the autotrophic partial nitrification reactor, N2O production mechanisms were complex and could involve multiple N2O production pathways.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 久

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