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Discriminating methane sources in ground gas emissions in NW England

Lookup NU author(s): Christopher Teasdale, Dr Jean Hall, Professor David Manning

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Geological Society Publishing House, 2018.

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Abstract

The identification of the source of methane (CH4) and carbon dioxide (CO2) in ground gases adjacent to municipal landfill sites where there are multiple potential contributing gas inputs is important for regulation and to inform gas control policy. Stable isotope analysis was applied to ground gas samples from boreholes external to landfills and landfill gas to differentiate biogenic and geogenic CH4 at sites in NW England. Landfill flare gas and landfill without external gas inputs were biogenic references. Ground gases adjacent to one landfill had potential external CH4 inputs from underlying Coal Measures. Mineshaft vent gas and North Sea Gas were geogenic references. Ground gas samples were subjected to Compound-Specific Isotope Ratio Mass Spectrometry (GC-IRMS) and conventional IRMS examination. δ13CCH4 values for landfill flare gas and landfill site 1 were -65.0‰ and -61.0‰, and δDCH4values were -319‰ and -298‰ respectively. δ13CCH4 values for site 2 landfill were -55‰ to -48‰, andδDCH4 values were -173 to +55‰. Mineshaft vent gas and North Sea Gas CH4 δ13CCH4 values were - 46.2‰ and -43.5‰, and δDCH4 values were -214‰ and -203‰, respectively. Site 2 landfill is concluded to have a geogenic CH4 contribution due to 13C and D enrichment in CH4.


Publication metadata

Author(s): Teasdale CJ, Hall JA, Martin JP, Manning DAC

Publication type: Article

Publication status: Published

Journal: Quarterly Journal of Engineering Geology and Hydrogeology

Year: 2018

Volume: 52

Issue: 1

Pages: 110-122

Online publication date: 17/10/2018

Acceptance date: 31/07/2018

Date deposited: 16/10/2018

ISSN (print): 1470-9236

ISSN (electronic): 2041-4803

Publisher: Geological Society Publishing House

URL: https://doi.org/10.1144/qjegh2018-083

DOI: 10.1144/qjegh2018-083


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