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ID 20587
file
creator
Tsushima, Ikuo
Ogasawara, Yuji
Satoh, Hisashi
Okabe, Satoshi
subject
Anammox biofilm reactor
biofilm structure and function
16S rRNA approach
microelectrodes
NDC
Chemistry
abstract
To promptly establish anammox (anaerobic ammonium oxidation) reactors, appropriate seeding sludge with high abundance and activity of anammox bacteria was selected by quantifying 16S rRNA gene copy numbers of anammox bacteria by real-time quantitative PCR (RTQ-PCR) and batch culture experiments. The selected sludge was then inoculated into up-flow fixed-bed biofilm column reactors with nonwoven fabric sheets as biomass carrier and the reactor performances were monitored over one year. The anammox reaction was observed within 50 days and a total nitrogen removal rate of 26.0 kg-N m-3 day-1 was obtained after 247 days. To our knowledge, such a high rate has never been reported before. Hydraulic retention time (HRT) and influent NH4+ to NO2- molar ratio could be important determinant factors for efficient nitrogen removal in this study. The higher nitrogen removal rate was obtained at the shorter HRT and higher influent NH4+/NO2- molar ratio. After anammox reactors were fully developed, the community structure, spatial organization and in situ activity of the anammox biofilms were analyzed by the combined use of a full-cycle of 16S rRNA approach and microelectrodes. In situ hybridization results revealed that the probe Amx820-hybridized anaerobic anammox bacteria were distributed throughout the biofilm (accounting for more than 70% of total bacteria). They were associated with Nitrosomonas-like aerobic ammonia-oxidizing bacteria (AAOB) in the surface biofilm. The anammox bacteria present in this study were distantly related to the Candidatus Brocadia anammoxidans with the sequence similarity of 95%. Microelectrode measurements showed that a high in situ anammox activity (i.e., simultaneous consumption of NH4+ and NO2-) of 4.45 g-N of (NH4+ + NO2-) m-2 day-1 was detected in the upper 800 μm of the biofilm, which was consistent with the spatial distribution of anammox bacteria.
journal title
Water Research
volume
Volume 41
issue
Issue 8
start page
1623
end page
1634
date of issued
2007-04
publisher
Pergamon-Elsevier Science Ltd.
issn
0043-1354
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 Elsevier Ltd
relation url
department
Graduate School of Engineering



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