매립지 복토의 수분증발에 따른 함수율변화가 메탄산화능력에 미치는 영향 (A Study on the Effect of Moisture Content Variation of Landfill Cover Soil on the Methane Oxidation Rate)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 26권 / 4호 / 329 ~ 335페이지
· 저자명 : 윤종현, 배성진, 김용진, Stephen Moore, 이동훈

초록

Methane (CH4) is a greenhouse gas with 21-fold higher global warming potential compared to that of carbon dioxide (CO2) over a 100-year time span. Landfills contribute to 10 ~ 20% of global anthropogenic emissions of CH4. The microbial oxidation of methane in cover soils is considered as a good viable and sustainable option for the emission control of landfill methane that is not yet collected and doesn't meet fully the calorific requirements for energetic utilization or flaring. In this study, the effect of moisture content variation of landfill cover soil on the methane oxidation rate was investigated by lab-scale batch and open top column test. Methane oxidations were identified in the range of 5 to 15% of moisture content as Mancinelli, but high oxidation rates were identified in the rage of 8% to 14% such as 1,795 to 2,932 nmol CH4/g·dry/hr and rapidly decreased in range over 14% in batch test. Higher than 90% of inflow methane flux were removed at the initial stage of column test in optimal moisture content of cover soil but decreased rapidly to 24% after 23 days run of column test with the decrease of moisture content by evaporation under 8.76 L-CH4/㎡/hr of influx condition. However, methane oxidation rate was recovered up to the initial stage level of column test in optimal condition by the injection of some water as rainfall. Therefore maintaining moisture content by rainfall or water spraying is very important to keep the methane oxidation rate high in landfill top cover soil or bio-cover. But sufficient results for thermo-dynamical analysis in terms of the water and heat balances during methane oxidation in cover soil column were not obtained in this study.

영어초록

Methane (CH4) is a greenhouse gas with 21-fold higher global warming potential compared to that of carbon dioxide (CO2) over a 100-year time span. Landfills contribute to 10 ~ 20% of global anthropogenic emissions of CH4. The microbial oxidation of methane in cover soils is considered as a good viable and sustainable option for the emission control of landfill methane that is not yet collected and doesn't meet fully the calorific requirements for energetic utilization or flaring. In this study, the effect of moisture content variation of landfill cover soil on the methane oxidation rate was investigated by lab-scale batch and open top column test. Methane oxidations were identified in the range of 5 to 15% of moisture content as Mancinelli, but high oxidation rates were identified in the rage of 8% to 14% such as 1,795 to 2,932 nmol CH4/g·dry/hr and rapidly decreased in range over 14% in batch test. Higher than 90% of inflow methane flux were removed at the initial stage of column test in optimal moisture content of cover soil but decreased rapidly to 24% after 23 days run of column test with the decrease of moisture content by evaporation under 8.76 L-CH4/㎡/hr of influx condition. However, methane oxidation rate was recovered up to the initial stage level of column test in optimal condition by the injection of some water as rainfall. Therefore maintaining moisture content by rainfall or water spraying is very important to keep the methane oxidation rate high in landfill top cover soil or bio-cover. But sufficient results for thermo-dynamical analysis in terms of the water and heat balances during methane oxidation in cover soil column were not obtained in this study.

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