Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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A study on the introduction of organic waste-to-energy incentive system(II): material and energy balance of biogasification

유기성폐자원에너지 인센티브제도 도입방안 연구(II): 바이오가스화 물질·에너지수지

  • Moon, Hee-Sung (Waste-to-Energy Research Division, National Institute of Environmental Research) ;
  • Kwon, Jun-Hwa (Waste-to-Energy Research Division, National Institute of Environmental Research) ;
  • Lee, Won-Seok (Waste-to-Energy Research Division, National Institute of Environmental Research) ;
  • Lee, Dong-Jin (Waste-to-Energy Research Division, National Institute of Environmental Research)
  • 문희성 (국립환경과학원 폐자원에너지연구과) ;
  • 권준화 (국립환경과학원 폐자원에너지연구과) ;
  • 이원석 (국립환경과학원 폐자원에너지연구과) ;
  • 이동진 (국립환경과학원 폐자원에너지연구과)
  • Received : 2021.11.24
  • Accepted : 2021.12.21
  • Published : 2021.12.30
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Abstract

In this study, to use as basic data for the organic waste resource energy incentive system, the energy efficiency is evaluated through the mass balance and energy balance calculation results of the anaerobic digester where food waste, food waste leachate and various organic wastes are treated. As a result of the mass balance analysis for 11 biogasification facilities, it was confirmed that 21.1% of process water and 25.7% of tap water were input in large amounts, excluding organic waste. Accordingly, it accounted for 87.6% of the total effluent of linked treated water. In addition, considering that 15.7% of the total input volume is converted to biogas and the average total solids (TS) is 22%, an average material conversion rate of 75% was confirmed. As a result of the energy balance analysis, the energy conversion rate was confirmed to be 78.5% on average by analyzing the biogas calorific value compared to the potential energy of the influent. The average biogas production efficiency including external energy sources for biogas production was 69.4%, and the biogas plant efficiency to which unused effluent energy was applied was 58.9% on average.

본 연구에서는 유기성폐자원에너지 인센티브제도의 기초자료로 활용하고자 음식물폐기물, 음폐수 및 다양한 유기성폐기물이 처리되는 혐기소화조의 운영방식의 물질수지와 에너지수지 산정 결과를 통하여 에너지효율을 평가하고자 한다. 바이오가스화 시설 11개소의 물질수지 분석 결과 유기성폐기물을 제외한 반입물 중 공정수 21.1%, 시상수 25.7 % 다량 투입되는 것을 확인하였다. 그에 따라 연계처리수의 전체 유출물의 87.6 %를 차지하였다. 또한 총 유입물량의 15.7 %가 바이오가스로 전환되며, 총고형물(TS)가 평균 22 %임을 감안할 때 평균 75 %의 물질 전환율을 확인하였다. 에너지수지 분석 결과, 유입물의 잠재에너지 대비 바이오가스 열량을 분석하여 에너지 전환율은 평균 78.5%을 확인하였다. 바이오가스를 생산하기 위한 외부에너지원을 포함한 바이오가스 생산효율은 평균 69.4 %이며, 미이용된 유출에너지를 적용한 바이오가스 플랜트 효율은 평균 58.9 %로 나타났다.

Keywords

Acknowledgement

본 논문은 2019년도 환경부의 재원으로 국립환경과학원의 지원을 받아 수행된 연구임(NIER-2019-01-01-080)

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