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Depth profiles of methane oxidation potentials and methanotrophic community in a lab-scale biocover

Paper ID Volume ID Publish Year Pages File Format Full-Text
23192 43419 2014 7 PDF Available
Title
Depth profiles of methane oxidation potentials and methanotrophic community in a lab-scale biocover
Abstract

•Depth profiles of the methanotrophic performance were characterized in a lab-scale soil mixture biocover.•CH4 oxidation rates in the deeper layer were 71–85% of that in the upper layer under aerobic condition.•The numbers of methanotrophs in the deeper layer were not significantly different from those in the upper sample.•There was no statistical difference in the community stability indices among layer samples.•This finding suggests that the deeper layer in the methanotrophic biocover serves as a bioresource reservoir.

The depth profiles of the CH4 oxidation potentials and the methanotrophic community were characterized in a lab-scale soil mixture biocover. The soil mixture samples were collected from the top (0–10 cm), middle (10–40 cm), and bottom (40–50 cm) layers of the biocover where most of methane was oxidized at the top layer due to consumption of O2. Batch tests using serum bottles showed that the middle and bottom samples displayed CH4 oxidation activity under aerobic conditions, and their CH4 oxidation rates were 85 and 71% of the rate of top sample (8.40 μmol g dry sample−1 h−1), respectively. The numbers of methanotrophs in the middle and bottom were not significantly different from those in the top sample. There was no statistical difference in the community stability indices (diversity and evenness) among the methanotrophic communities of the three layer samples, even though the community structures were distinguished from each other. Based on microarray analysis, type I and type II methanotrophs were equally present in the top sample, while type I was more dominant than type II in the middle and bottom samples. We suggested that the qualitative difference in the community structures was probably caused by the difference in the depth profiles of the CH4 and O2 concentrations. The results for the CH4 oxidation potential, methanotrophic biomass, and community stability indices in the middle and bottom layer samples indicated that the deeper layer in the methanotrophic biocover serves as a bioresource reservoir for sustainable CH4 mitigation.

Keywords
Methane; Biocover; Depth profile; Methanotrophs; Bioresource
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Depth profiles of methane oxidation potentials and methanotrophic community in a lab-scale biocover
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 184, 20 August 2014, Pages 56–62
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us