Effects of SRT and DO on N2O reductase activity in an anoxic-oxic activated sludge system.

N. Noda, N. Kaneko, M. Mikami, Y. Kimochi, S. Tsuneda, A. Hirata, M. Mizuochi, Y. Inamori

研究成果: Article

抄録

Nitrous oxide (N2O) is emitted from wastewater treatment processes, and is known to be a green house gas contributing to global warming. It is thus important to develop technology that can suppress N2O emission. The effects of sludge retention time (SRT) and dissolved oxygen (DO) on N2O emission in an anoxic-oxic activated sludge system were estimated. Moreover, the microbial community structure in the sludge, which plays an important role in N2O suppression, was clarified based on nitrous oxide reductase (nosZ) gene analysis by molecular biological techniques. The results showed that under low SRT conditions, nitrification efficiency was reduced and the N2O emission rate in the oxic reactors was increased. It was also observed that N2O emission was enhanced under low DO conditions, where the available oxygen is insufficient for nitrification. Moreover, molecular analysis revealed that the clones identified in this study were closely related to Ralstonia eutropha and Paracoccus denitrificans. The fact that the identified sequences are not closely related to known culturable denitrifier nosZ sequences indicates a substantial in situ diversity of denitrifiers contributing to N2O suppression, which are not reflected in the cultivatable fraction of the population. The further application of these new molecular techniques should serve to enhance our knowledge of the microbial community of denitrifying bacteria contributing to N2O suppression in wastewater treatment systems.

元の言語English
ページ(範囲)363-370
ページ数8
ジャーナルWater science and technology : a journal of the International Association on Water Pollution Research
48
発行部数11-12
出版物ステータスPublished - 2003
外部発表Yes

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Nitrification
Dissolved oxygen
Wastewater treatment
activated sludge
dissolved oxygen
sludge
Oxides
Global warming
nitrous oxide
Greenhouse gases
nitrification
microbial community
Bacteria
Genes
Oxygen
molecular analysis
clone
global warming
community structure
greenhouse gas

ASJC Scopus subject areas

  • Water Science and Technology

これを引用

Effects of SRT and DO on N2O reductase activity in an anoxic-oxic activated sludge system. / Noda, N.; Kaneko, N.; Mikami, M.; Kimochi, Y.; Tsuneda, S.; Hirata, A.; Mizuochi, M.; Inamori, Y.

:: Water science and technology : a journal of the International Association on Water Pollution Research, 巻 48, 番号 11-12, 2003, p. 363-370.

研究成果: Article

Noda, N. ; Kaneko, N. ; Mikami, M. ; Kimochi, Y. ; Tsuneda, S. ; Hirata, A. ; Mizuochi, M. ; Inamori, Y. / Effects of SRT and DO on N2O reductase activity in an anoxic-oxic activated sludge system. :: Water science and technology : a journal of the International Association on Water Pollution Research. 2003 ; 巻 48, 番号 11-12. pp. 363-370.
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T1 - Effects of SRT and DO on N2O reductase activity in an anoxic-oxic activated sludge system.

AU - Noda, N.

AU - Kaneko, N.

AU - Mikami, M.

AU - Kimochi, Y.

AU - Tsuneda, S.

AU - Hirata, A.

AU - Mizuochi, M.

AU - Inamori, Y.

PY - 2003

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