Carbon isotopic characterisation and oxidation of UK landfill methane emissions by atmospheric measurements.

Carbon isotopic characterisation and oxidation of UK landfill methane emissions by atmospheric measurements.
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通过大气测量对英国垃圾填埋场甲烷排放进行碳同位素表征和氧化。

DOI:
10.1016/j.wasman.2021.07.012
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发表时间:
2021
期刊:
Waste management (New York, N.Y.)
影响因子:
--
通讯作者:
Bakkaloglu S
Bakkaloglu S
中科院分区:
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文献类型:
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作者:
Bakkaloglu S

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Biological oxidation of methane in landfill cover material can be calculated from the carbon isotopic signature (δ13CCH4) of emitted CH4.Enhanced microbial consumption of methane in the aerobic portion of the landfill cover is indicated by a shift to heavier (less depleted) isotopic values in the residual methane emitted to air. This study was conducted at four landfill sites in southwest England. Measurement of CH4using a mobile vehicle mounted instrument at the four sites was coupled with Flexfoil bag sampling of ambient air for high-precision isotope analysis. Gas well collection systems were sampled to estimate landfill oxidised proportion. Closed or active status, seasonal variation, cap stripping and site closure impact on landfill isotopic signature were also assessed. The δ13CCH4values ranged from −60 to −54‰, with an average value of −57 ± 2‰. Methane emissions from active cells are more depleted in13C than closed sites. Methane oxidation, estimated from the isotope fractionation, ranged from 2.6 to 38.2%, with mean values of 9.5% for active and 16.2% for closed landfills, indicating that oxidised proportion is highly site specific.
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