유기물자원화 (Journal of the Korea Organic Resources Recycling Association)

  • 제31권4호
  • /
  • Pages.13-28
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  • 2023
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  • 1225-6498(pISSN)
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  • 2508-3015(eISSN)
유기성자원학회 (Korea Organic Resources Recycling Association)
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잔디 예지물의 혐기소화에서 사일리지 저장기간이 메탄 생산에 미치는 영향

Effects of silage storage period of grass clippings on methane production by anaerobic digestion

  • 여진 (한경국립대학교 바이오가스연구센터) ;
  • 김태희 (한경국립대학교 식물생명환경전공) ;
  • 김창규 (한경국립대학교 식물생명환경전공) ;
  • 이서영 (한경국립대학교 식물생명환경전공) ;
  • 윤영만 (한경국립대학교 바이오가스연구센터)
  • Jin Yeo (Biogas Research Center, Hankyong National University) ;
  • Tae-Hee Kim (Department of Plant Life and Environmental Science, Hankyong National University) ;
  • Chang-Gyu Kim (Department of Plant Life and Environmental Science, Hankyong National University) ;
  • Seo-Yeong Lee (Department of Plant Life and Environmental Science, Hankyong National University) ;
  • Young-Man Yoon (Biogas Research Center, Hankyong National University)
  • 투고 : 2023.11.14
  • 심사 : 2023.12.06
  • 발행 : 2023.12.30
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초록

본 연구에서는 초본계 바이오매스인 잔디 예지물의 혐기소화 원료 가치를 평가하기 위하여 잔디 3종 (Poa pratensis, PP; Zoysia japonica, ZJ; Agrostis stolonifera, AS)의 생화학적 메탄퍼텐셜을 측정하였으며, 사일리지 저장기간 (0, 30, 60, 90, 120, 180일)에 따른 잔디 예지물 (PP)의 생화학적 메탄퍼텐셜 변화를 분석하여 사일리지 저장기간이 잔디 예지물의 혐기소화에 미치는 영향을 평가하고자 하였다. Parallel first-order kinetics model에 의한 생화학적 메탄퍼텐셜 (Bu-P)은 PP, ZJ, AS에서 각각 0.330, 0.297, 0.261 Nm3/kg-VSadded이었으며, PP의 잔디 예지물이 메탄생산을 위한 혐기소화 원료로서 가장 적합하였다. PP의 잔디 예지물 사일리지의 Bu-P는 저장기간 0일 0.269 Nm3/kg-VSadded에서 저장기간 180일 0.217 Nm3/kg-VSadded로 약 19% 감소하였다. 또한, 잔디 예지물 사일리지 저장기간 0일에 NDF, ADF, BP 함량은 각각 67.59, 39.68, 3.02%인 반면, 180일에는 각각 77.12, 54.65, 6.24%로 나타나 저장기간 180일에 잔디 예지물 사일리지에서 세포벽 구성 물질의 함량이 크게 증가하였다. 잔디 예지물을 효율적으로 혐기소화 하기 위해서는 사일리지 저장 방식 외에도 사일리지 제조과정에서 초기 수분함량, 효소 또는 알칼리 처리와 같은 전처리 방법, 잔류 농약에 의한 혐기소화 저해 영향 등에 관한 추가적인 연구가 요구된다.

This study assessed the biochemical methane potential (Bu-P) of three grass species-Poa pratensis (PP), Zoysia japonica (ZJ), and Agrostis stolonifera (AS). Bu-P values were determined as 0.330 Nm3/kg-VSadded for PP, 0.297 Nm3/kg-VSadded for ZJ, and 0.261 Nm3/kg-VSadded for AS. Notably, PP exhibited superior suitability for methane production. The investigation also examined the impact of silage storage duration on PP grass clippings, revealing a 19% decline in Bu-P from an initial value of 0.269 Nm3/kg-VSadded on day 0 to 0.217 Nm3/kg-VSadded on day 180. Throughout the storage period, there were significant increases in neutral detergent fiber (NDF), acid detergent fiber (ADF), and crude protein (CP) contents, rising from 67.59%, 39.68%, and 3.02% on day 0 to 77.12%, 54.65%, and 6.24% on day 180, respectively. These findings highlight the influence of storage duration on the anaerobic digestibility of PP grass clippings. To effectively utilize grass clippings as a renewable resource for methane production, further studies considering factors such as initial moisture content, pretreatment methods, and potential effects of residual pesticides are necessary to optimize anaerobic digestion efficiency for herbaceous biomass.

키워드

과제정보

본 연구는 농림축산식품부 및 농림식품기술기획평가원의 지원을 받아 수행되었습니다 (과제번호 : 321091-3)

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