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Estimation of CH4 oxidation efficiency in an interim landfill cover soil using CO2/CH4 ratios

  • Park, Jin-Kyu (Ecowillplus Co. Ltd.) ;
  • Lee, Won-Jae (Department of Environmental and Energy Engineering, Anyang University) ;
  • Ban, Jong-Ki (Department of Environmental and Energy Engineering, Anyang University) ;
  • Kim, Eun-Cheol (Department of Environmental and Energy Engineering, Anyang University) ;
  • Lee, Nam-Hoon (Department of Environmental and Energy Engineering, Anyang University)
  • Received : 2015.01.12
  • Accepted : 2015.06.01
  • Published : 2015.06.30

Abstract

The first objective of this study was to discuss the applicability of the $CO_2/CH_4$ ratio method in order to assess $CH_4$ oxidation efficiency. To achieve this objective, a comparison between $CO_2/CH_4$ ratios and the mass balance method was conducted. The second objective of this study was to estimate the $CH_4$ oxidation efficiency in an interim landfill soil cover and assess how a $CH_4$ influx influences the $CH_4$ oxidation efficiency. The results showed that despite the $CO_2$ problems brought by respiration, the $CH_4$ oxidation efficiencies obtained by the $CO_2/CH_4$ ratio method led to similar results compared to the mass balance method. In this respect, the $CO_2/CH_4$ ratio method can be an indicator of the $CH_4$ oxidation efficiencies for landfill cover soils. The $CH_4$ oxidation efficiencies derived in this study through the $CO_2/CH_4$ 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 $CH_4$ oxidation efficiency is an underestimation for landfill cover soils. $CH_4$ oxidation efficiency tends to be negatively correlated with $CH_4$ influx. Therefore, $CH_4$ influx reaching a landfill cover should be limited in order to increase the $CH_4$ oxidation efficiency.

Keywords

$CH_4$ oxidation;$CO_2/CH_4$ ratio;Landfill;Mass balance

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