Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Biotechnology for the Mitigation of Methane Emission from Landfills

매립지의 메탄 배출 저감을 위한 생물공학기술

  • Cho, Kyung-Suk (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Ryu, Hee-Wook (Department of Chemical and Environmental Engineering, Soongsil University)
  • 조경숙 (이화여자대학교 환경공학과) ;
  • 류희욱 (숭실대학교 환경화학공학과)
  • Published : 2009.12.28
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Abstract

Methane, as a greenhouse gas, is some 21~25 times more detrimental to the environmental than carbon dioxide. Landfills generally constitute the most important anthropogenic source, and methane emission from landfill was estimated as 35~73 Tg per year. Biological approaches using biocover (open system) and biofilter (closed system) can be a promising solution for older and/or smaller landfills where the methane production is too low for energy recovery or flaring and installation of a gas extraction system is inefficient. Methanotrophic bacteria, utilizing methane as a sole carbon and energy source, are responsible for the aerobic degradation (oxidation) of methane in the biological systems. Many bench-scale studies have demonstrated a high oxidation capacity in diverse filter bed materials such as soil, compost, earthworm cast and etc. Compost had been most often employed in the biological systems, and the methane oxidation rates in compost biocovers/boifilters ranged from 50 to $700\;g-CH_4\;m^{-2}\;d^{-1}$. Some preliminary field trials have showed the suitability of biocovers/biofilters for practical application and their satisfactory performance in mitigation methane emissions. Since the reduction of landfill methane emissions has been linked to carbon credits and trading schemes, the verified quantification of mitigated emissions through biocovers/biofilters is very important. Therefore, the assessment of in situ biocovers/biofilters performance should be standardized, and the reliable quantification methods of methane reduction is necessary.

메탄은 온실효과가 이산화탄소 보다 20배 이상인 대표적인 non-$CO_2$ 온실가스이다. 매립지는 주요 인위적 메탄 발생원으로, 매립지의 메탄 발생량은 연간 35~73 Tg(tera gram)으로 추정된다. 바이오커버(개방형 시스템)과 바이오필터(폐쇄형 시스템)을 이용하는 생물학적 방법은 메탄을 회수하여 자원화하기에는 메탄 농도가 너무 낮거나 가스 포집정이 설치되어 있지 않는 노후화된 매립지나 소규모 매립지로부터 메탄 배출을 저감할 수 있는 유용한 방법이다. 메탄을 유일탄소원과 에너지원으로 활용하는 메탄산화세균은 이러한 생물학적 방법에 있어 메탄을 산화시켜 제거하는데 매우 중요한 역할을 담당한다. 토양, compost, 지렁이 분변토 등과 같은 다양한 충전재를 이용하여 실험실 규모의 바이오커버/바이오필터의 메탄산화효율에 관한 많은 연구가 진행되었다. 이 중에서 compost는 가장 많이 이용되고 있는 충전재이고, compost를 이용한 바이오커버/바이오필터의 메탄산화속도는 50에서 $700\;g-CH_4\;m^{-2}\;d^{-1}$로 보고되고 있다. 또한, 실제 매립지에 파일럿 규모의 바이오커버/바이오필터를 설치하여 메탄 배출 저감 효과에 관한 연구도 진행되고 있다. 매립지의 메탄 배출 저감은 탄소배출권 거래와 연관될 수 있으므로, 바이오커버/바이오필터에 의한 메탄 저감량을 정확하게 평가하는 것이 매우 중요하다. 그러므로, 매립지 현장에 설치된 바이오커버/바이오필터의 성능을 평가하는 방법은 표준화되어야 하며, 메탄 저감량을 정확하게 정량화할 수 있는 방법 개발이 필요하다.

Keywords

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