Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Basic Study on the in-situ Biogenic Methane Generation from Low Grade Coal Bed

저품위 석탄의 원지반에서의 생물학적 메탄가스 생산에 관한 기초연구

  • Wang, Fei (Department of Environmental Engineering, Semyung University) ;
  • Jeon, Ji-Young (Department of Environmental Engineering, Semyung University) ;
  • Lim, Hak-Sang (Department of Environmental Engineering, Semyung University) ;
  • Yoon, Seok-Pyo (Department of Environmental Engineering, Semyung University)
  • 왕페이 (세명대학교 바이오환경공학과) ;
  • 전지영 (세명대학교 바이오환경공학과) ;
  • 임학상 (세명대학교 바이오환경공학과) ;
  • 윤석표 (세명대학교 바이오환경공학과)
  • Received : 2015.08.19
  • Accepted : 2015.09.07
  • Published : 2015.12.30
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Abstract

In the present work, a basic study on the in-situ biogenic methane generation from low grade coal bed was conducted. Lignite from Indonesia was used as a sample feedstock. A series of BMP (Biochemical Methane Potential) tests were carried out under the different experimental conditions. Although nutrients and anaerobic digester sludge were added to the coal, the produced amount of methane was limited. Both temperature control and particle size reduction showed little effect on the increase of methane potential. When rice straw was added to lignite as an external carbon source, methane yield of 94.4~110.4 mL/g VS was obtained after 60 days of BMP test. The calorific value of lignite after BMP test decreased (4.5~12.1 %) as increasing the content of rice straw (12.5~50 wt % of lignite), implying that anaerobic digestion of rice straw led to partial degradation of lignite. Therefore, rice straw could be used as an external carbon source for the start-up of in-situ biogas generation from low grade coal bed.

원지반에서의 저품위 석탄층의 생물학적 메탄 생산을 위한 기초연구를 수행하였다. 인도네시아산 갈탄을 시료로 이용하였으며, 조건을 달리하여 BMP(Biochemical Methane Potential) 실험을 수행하였다. 갈탄에 영양물질과 혐기성 슬러지만 제공한 경우, 온도(23, $30^{\circ}C$)나 석탄의 입자크기는 메탄가스 생산에 영향을 주지 않았다. 이는 가용한 용해성 유기물질이 낮기 때문이다. 외부탄소원으로 볏짚을 갈탄에 첨가한 후 BMP 실험을 수행하였으며, 60일간의 BMP 실험 후 볏짚 첨가에 의한 메탄가스 발생량은 94.4~110.4 mL/g VS이었다. BMP 실험 후 갈탄의 발열량은 볏짚 첨가량이 증가할수록 감소하는 경향을 보였다. 이는 볏짚의 혐기성 분해와 함께 갈탄의 분해가 이루어졌음을 의미한다. 따라서 원지반에서의 저품위 석탄층의 생물학적 메탄 생산의 초기 운전 시에 볏짚을 탄소원으로 사용할 수 있다.

Keywords

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