Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Characteristics of Anaerobic Digestion using Food waste leachate under Increased Organic Loading rate

유기물부하량 증가에 따른 음폐수 혐기성소화의 특성 분석

  • 정재훈 (경기대학교 일반대학원 환경에너지공학과) ;
  • 정우진 (경기대학교 창의공과대학 환경에너지공학전공) ;
  • 장순웅 (경기대학교 창의공과대학 환경에너지공학전공) ;
  • 김진태 ((주)파이브텍) ;
  • 정성엽 ((주)파이브텍) ;
  • 양승연 ((주)파이브텍)
  • Received : 2022.11.28
  • Accepted : 2022.12.20
  • Published : 2022.12.31
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Abstract

Herein , the effect of changes in the organic loading rate in anaerobic digestion was evaluated. The experiment was carried out by a laboratory -scale semi-continuous stirred tank reactor, and feedstock was food-waste leached. The organic loading rate was increased by 0.5 kgVS/m3 in each phase from 1.0 kgVS/m3 to 4.0 kgVS/m3. At the end of the operation, to check the failure of the reactor, the organic loading rate was increased by 1.0 kgVS/m3 in each phase and reached 6.0 kgVS/m3. This shows that the biogas yield decreased as organic loading rate increased. Biogas production seemed to be unstable at 3.5-6.0 kgVS/m3. Moreover, biogas production dramatically fell to approximately 0 mL at 6.0 kgVS/m3, which was decided as the operation failure on the 16th day of the las tphase. The result of the reactor analysis shows that the cumulation of volatile fatty acid increased as the organic loading rate increased. This seems to occur due to the decreasein pH in the reactor and led to extinction of anaerobic bacteria, which were the biogas products. Although the buffer compound (alkalinity) could prevent the decline in pH, the concentration of alkalinity was found to be lacking at a high organic loading rate

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 상하수도 혁신 기술개발사업의 지원을 받아 연구되었습니다. (과제번호 2021002690003)

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