Abstract
The first objective of this study was to discuss the applicability of the CO₂/CH₄ ratio method in order to assess CH₄ oxidation efficiency. To achieve this objective, a comparison between CO₂/CH₄ ratios and the mass balance method was conducted. The second objective of this study was to estimate the CH₄ oxidation efficiency in an interim landfill soil cover and assess how a CH₄ influx influences the CH₄ oxidation efficiency. The results showed that despite the CO₂ problems brought by respiration, the CH₄ oxidation efficiencies obtained by the CO₂/CH₄ ratio method led to similar results compared to the mass balance method. In this respect, the CO₂/CH₄ ratio method can be an indicator of the CH₄ oxidation efficiencies for landfill cover soils. The CH₄ oxidation efficiencies derived in this study through the CO₂/CH₄ ratio method ranged between 46% and 64%, and between 41% and 62% through the mass balance method. The results imply that the Intergovernmental Panel on Climate Change``s (IPCC) default value of 10% for the CH₄ oxidation efficiency is an underestimation for landfill cover soils. CH₄ oxidation efficiency tends to be negatively correlated with CH₄ influx. Therefore, CH₄ influx reaching a landfill cover should be limited in order to increase the CH₄ oxidation efficiency.
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