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ID 34793
file
creator
Hatamoto, Masashi
Miyauchi, Tomo
Ohashi, Akiyoshi
subject
Greenhouse gas
Methane oxidation
Anaerobic treatment
Post-treatment
Down-flow hanging sponge (DHS)
NDC
Pollution. Environmental engineering
abstract
Post-treatment of anaerobic wastewater was undertaken to biologically oxidize dissolved methane, with the aim of preventing methane emission. The performance of dissolved methane oxidation and competition for oxygen among methane, ammonium, organic matter, and sulfide oxidizing bacteria were investigated using a lab-scale closed-type down-flow hanging sponge (OHS) reactor. Under the oxygen abundant condition of a hydraulic retention time of 2 h and volumetric air supply rate of 12.95 m(3)-air m(-3) day(-1), greater than 90% oxidation of dissolved methane, ammonium, sulfide, and organic matter was achieved. With reduction in the air supply rate, ammonium oxidation first ceased, after which methane oxidation deteriorated. Sulfide oxidation was disrupted in the final step, indicating that COD and sulfide oxidation occurred prior to methane oxidation. A microbial community analysis revealed that peculiar methanotrophic communities dominating the Methylocaldum species were formed in the DHS reactor operation. (C) 2011 Elsevier Ltd. All rights reserved.
journal title
Bioresource Technology
volume
Volume 102
issue
Issue 22
start page
10299
end page
10304
date of issued
2011
publisher
Elsevier Science Ltd
issn
0960-8524
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
(c) 2011 Elsevier B.V. All rights reserved.
relation url
department
Graduate School of Engineering