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Macroscale and microscale analyses of nitrification and denitrification in biofilms attached on membrane aerated biofilm reactors

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Title: Macroscale and microscale analyses of nitrification and denitrification in biofilms attached on membrane aerated biofilm reactors
Authors: Satoh, Hisashi Browse this author
Ono, Hideki Browse this author
Rulin, Bian Browse this author
Kamo, Jyn Browse this author
Okabe, Satoshi Browse this author
Fukushi, Ken-Ichi Browse this author
Keywords: Membrane aerated biofilm reactors
COD removal
Nitrification
Organic carbon loading rate
Intra-membrane air pressure
Microelectrodes
Issue Date: Mar-2004
Publisher: Elsevier
Journal Title: Water Research
Volume: 38
Issue: 6
Start Page: 1633
End Page: 1641
Publisher DOI: 10.1016/j.watres.2003.12.020
Abstract: A membrane aerated biofilm reactor (MABR), in which O2 was supplied from the bottom of the biofilm and NH4+ and organic carbon were supplied from the biofilm surface, was operated at different organic carbon loading rates and intra-membrane air pressures to investigate the occurrence of simultaneous COD removal, nitrification and denitrification. The spatial distribution of nitrification and denitrification zones in the biofilms was measured with microelectrodes for O2, NH4+, NO2-, NO3- and pH. When the MABR was operated at approximately 1.0 g-COD/m2/day of COD loading rate, simultaneous COD removal, nitrification and denitrification could be achieved. The COD loading rates and the intra-membrane air pressures applied in this study had no effect on the start-up and the maximum rates of NH4+ oxidation in the MABRs. Microelectrode measurements showed that O2 was supplied from the bottom of the MABR biofilm and penetrated the whole biofilm. Because the biofilm thickness increased during the operations, an anoxic layer developed in the upper parts of the mature biofilms while an oxic layer was restricted to the deeper parts of the biofilms. The development of the anoxic zones in the biofilms coincided with increase in the denitrification rates. Nitrification occurred in the zones from membrane surface to a point of ca. 60 µm. Denitrification mainly occurred just above the nitrification zones. The COD loading rates and the intra-membrane air pressures applied in this study had no effect on location of the nitrification and denitrification zones.
Relation: http://www.sciencedirect.com/science/journal/00431354
Type: article (author version)
URI: http://hdl.handle.net/2115/45367
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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