Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Field Application of Biocovers in Landfills for Methane Mitigation

매립지 메탄 저감을 위한 바이오커버의 현장 적용 평가

  • Jung, Hyekyeng (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Yun, Jeonghee (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Oh, Kyung Cheol (Green Environmental Complex Center) ;
  • Jeon, Jun-Min (Green Environmental Complex Center) ;
  • Ryu, Hee-Wook (Department of Chemical Engineering, Soongsil University) ;
  • Cho, Kyung-Suk (Department of Environmental Science and Engineering, Ewha Womans University)
  • Received : 2017.08.23
  • Accepted : 2017.09.20
  • Published : 2017.12.28
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Abstract

Two pilot-scale biocovers (PBCs) were installed in a landfill, and the methane ($CH_4$) concentrations at their inlets and outlets were monitored for 240 days to evaluate the methane removability. Consequently, the packing materials were sampled from the PBCs, and their potential $CH_4$ oxidizing abilities were evaluated in serum vials. The $CH_4$ concentration at the inlet of the biocovers was observed to be in the range of 23.7-47.9% (average = 41.3%, median = 42.6%). In PBC1, where a mixture of soil, earthworm cast, and compost (7:2:1, v/v) was employed as the packing material, the $CH_4$ removal efficiency was evaluated to be between 60.7-85.5%. In PBC2, which was filled with a mixture of soil, earthworm cast, perlite, and compost (4:2:3:1, v/v), the removal efficiency was evaluated to be between 29.2-78.5%. Although the packing materials had an excellent $CH_4$ oxidizing potential (average oxidation rate for $CH_4=180-199{\mu}g\;CH_4{\cdot}g\;packing\;material^{-1}{\cdot}h^{-1}$), $CH_4$ removal efficiency in PBC1 and PBC2 decreased to the range of 0-30% once the packing materials in the PBCs were clogged and channeled. Furthermore, seasonal effects exhibited no significant differences in the $CH_4$ removal efficiency of the biocovers. The results of this study can be used to design and operate real-scale biocovers in landfills to mitigate $CH_4$ buildup.

본 연구에서는 생활 폐기물 매립지 현장에 파일럿 규모의 바이오커버(pilot-scale biocover, PBC) 2기를 설치하고, 240일 동안 메탄 제거 효율을 모니터링하였다. 또한, 바이오커버 충전 소재를 채취하여 혈청병에서 잠재 메탄 산화능을 평가하였다. 바이오커버로 유입되는 메탄 농도는 23.7-47.9%(평균 값 = 41.3%, 중간값 = 42.6%) 수준이었다. 토양, 지렁이 분변토 및 퇴비 혼합물(7:2:1, v/v)을 충전 소재로 구축한 PBC1의 메탄 제거 효율은 60.7-85.5%이었다. 토양, 지렁이 분변토, perlite 및 퇴비 혼합물(4:2:3:1, v/v)을 충전 소재로 구축한 PBC2의 표메탄 제거 효율은 29.2-78.5%이었다. 그러나, 바이오커버의 충전 소재 자체의 메탄 잠재 산화 능력이 우수함에도 불구하고(평균메탄산화속도 = $180-199{\mu}g\;CH_4{\cdot}g\;packing\;material^{-1}{\cdot}h^{-1}$), 충전 소재의 다짐현상과 채널링이 발생하면 PBC1과 PBC2의 메탄 제거 효율은 0-30%로 저하되었다. 한편, 바이오커버의 메탄 제거 효율은 계절(외부 기온)에 따른 유의적인 차이를 보이지 않았다. 본 연구로부터 도출된 결과는 향후 매립지 현장에 실규모의 메탄 저감용 바이오커버를 설계하고 운전 조건을 구축하는데 유용하게 활용 가능하다.

Keywords

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