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ID 34540
file
creator
Awata, Takanori
Tanabe, Katsuichiro
Ohashi, Akiyoshi
subject
anaerobic ammonium oxidation (anammox)
enrichment
marine anammox bacteria
NDC
Pollution. Environmental engineering
abstract
Anaerobic ammonium oxidation (anammox) involves the microbiological oxidation of ammonium with nitrite as the electron acceptor and dinitrogen gas as the main product. The Scalindua species, an anammox genus that dominates natural habitats, plays an important role in catalysing the loss of nitrogen from marine environments. Until now, a few Scalindua species have been reported to be enriched from sea sediments. The objective of this study is to enrich marine anammox bacteria with coastal sediments in Hiroshima Bay as the inocula. The enrichment was achieved using a continuous upflow column reactor with synthetic sea water containing ammonium and nitrite. After 48 days of incubation, a simultaneous decrease in ammonium and nitrite was observed. A total nitrogen removal rate of 1.16 kg-N m-3 day-1 was attained after 306 days of incubation when the nitrogen loading rate was 1.32 kg-N m-3 day-1. Phylogenetic analysis revealed that the sequence similarity between the marine anammox-like bacteria in this reactor and the unidentified Candidatus Scalindua sp. was 96–98%. We successfully enriched marine anammox bacteria in the sediments of Hiroshima Bay by using synthetic sea water. Further studies are needed to investigate the characteristics of marine anammox bacteria, including optimal pH, temperature, and nitrogen loading rate.
journal title
Water Science & Technology
volume
Volume 63
issue
Issue 5
start page
965
end page
970
date of issued
2011
publisher
IWA Publishing
issn
0273-1223
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
(c) IWA Publishing 2011. The definitive peer-reviewed and edited version of this article is published in Water Science & Technology Vol. 63, No. 5, pp.965–970, 2011. doi:10.2166/wst.2011.277 and is available at www.iwapublishing.com.
relation url
department
Graduate School of Engineering