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Effect of oxygen concentration on nitrification and denitrification in single activated sludge flocs

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Title: Effect of oxygen concentration on nitrification and denitrification in single activated sludge flocs
Authors: Satoh, Hisashi Browse this author
Nakamura, Yoshiyuki Browse this author
Ono, Hideki Browse this author
Okabe, Satoshi Browse this author
Keywords: Single activated sludge flocs
O2 concentration
Nitrification
Denitrification
Microelectrodes
Issue Date: Sep-2003
Publisher: Wiley-Blackwell
Journal Title: Biotechnology and Bioengineering
Volume: 83
Issue: 5
Start Page: 604
End Page: 607
Publisher DOI: 10.1002/bit.10717
Abstract: Simultaneous nitrification and denitrification (SND) was observed in the single aeration tank of a municipal wastewater treatment plant. Microelectrode measurements and batch experiments were performed to investigate the occurrence of SND. The microelectrodes recorded the occurrence of O2 concentration gradients in individual activated sludge flocs. When the O2 concentration in the bulk liquid was less than 45 uM, anoxic zones were detected within flocs with larger diameter (approximately 3,000 um). The O2 penetration depth in the floc was found to be dependent on the O2 concentration in the bulk liquid. Nitrification was restricted to the oxic zones, whereas denitrification occurred mainly in the anoxic zones. The nitrification rate of the activated sludge increased with increasing O2 concentration in the bulk liquid, up to 40 uM and remained constant thereafter. SND was observed in the aerated activated sludge when O2 concentration was in the range of 10 uM to 35 uM.
Rights: This is the pre-peer-reviewed version of the following article: Satoh, H., Nakamura, Y., Ono, H. and Okabe, S. (2003), Effect of oxygen concentration on nitrification and denitrification in single activated sludge flocs. Biotechnology and Bioengineering, 83: 604–607. doi: 10.1002/bit.10717, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/bit.10717/abstract
Type: article (author version)
URI: http://hdl.handle.net/2115/45294
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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