Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Study on Characteristics of Biogas Production and Liquid Fertilizer with Anaerobic Co digestion of Livestock Manure and Food Waste

혐기성소화에서 가축분뇨와 음식물쓰레기의 혼용에 따른 바이오가스 생산 및 소화액의 액비 특성 연구

  • Park, Woo-Kyun (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA) ;
  • Park, Noh-Back (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA) ;
  • Shin, Joung-Du (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA) ;
  • Hong, Seung-Gil (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA) ;
  • Kwon, Soon-Ik (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA) ;
  • Kang, Kee-Kyung (Climate Change and Agroecology Division, National Academy of Agricultural Science, RDA)
  • 박우균 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 박노백 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 신중두 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 홍승길 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 권순익 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 강기경 (농촌진흥청 국립농업과학원 기후변화생태과)
  • Received : 2011.09.02
  • Accepted : 2011.10.14
  • Published : 2011.10.31
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Abstract

Objective of this research was to investigate the characteristics of biogas production in anaerobic digestion reactor with different mixing ratio of food waste and swine manure. It was observed that the highest removal efficiency of organic material was 80% at 60 : 40 of mixing ratio (livestock manure : food waste). And also biogas yield was varied due to different mixing ratio of them. The cumulative biogas yield was highest at 60 : 40 of mixing rate (livestock manure : food waste). For use of the liquefied fertilizer as effluent from anaerobic digester, it was the limited ratio for 30% of co-digested food waste based on its salt content.

혐기성소화에서 원료로 가축분뇨와 음식물 쓰레기의 혼합비에 따른 유기물 제거율은 60:40에서 총고형물 (TS) 및 휘발성고형물 (VS)이 각각 약 80%로 가장 높은 제거효율을 보였다. 통합소화에 의한 누적가스발생량을 비교하였을 때에도 가축분뇨 60%와 음식물 쓰레기 40%를 투입한 처리 (60:40)에서 가장 많은 가스 발생량을 나타내었다. 그러나 통합소화액의 염분함량을 고려할 때 가축분뇨 0.1%, 음식물 쓰레기 0.6%의 염분을 함유한 원료를 대상으로 혼합비율을 달리하여 투입하였을 때 음식물 쓰레기 100% 투입의 경우에 소화액의 염분함량은 0.45%, 음식물 쓰레기 60%와 가축분뇨 40% 투입에서 0.32, 음식물쓰레기 40%와 가축분뇨 60% 투입에서 0.27%, 음식물 쓰레기 20%와 가축분뇨 80% 투입에서 0.21로 나타났다. 따라서 본 연구결과를 토대로 하여 가축분뇨와 음식물 쓰레기를 통합소화하고 소화액을 액비로 농경지에 안정적으로 사용하기 위해서는 음식물 쓰레기의 투입 한계비율은 30%이하가 적정 하다고 판단할 수 있었다. 하지만 통합 소화액을 액비로서 농경지에 지속적으로 사용 가능하게 하기 위해서는 원료별, 발생원별로 너무 다양한 음식물 쓰레기의 염분함량에 대한 조사와 더불어 통합소화를 위한 적정 혼합비율 설정 및 토양 및 작물 재배를 통한 검증이 이루어져야 할 것으로 생각된다.

Keywords

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