Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Biogas Production from Sewage Sludge in 30L Microbial Electrolysis Cell

30L 미생물전기분해전지의 하수슬러지로부터 바이오가스 생산 특성

  • Lee, Myoung-Eun (Department of Environmental Engineering, Gyeongnam National University of Science and Technology) ;
  • Ahn, Yongtae (Department of Energy Engineering, Gyeongnam National University of Science and Technology) ;
  • Shin, Seung Gu (Department of Energy Engineering, Gyeongnam National University of Science and Technology) ;
  • Seo, Sun-Chul (Wastewater Treatment Department, Youngjin Environment) ;
  • Chung, Jae Woo (Department of Environmental Engineering, Gyeongnam National University of Science and Technology)
  • 이명은 (경남과학기술대학교 환경공학과) ;
  • 안용태 (경남과학기술대학교 에너지공학과) ;
  • 신승구 (경남과학기술대학교 에너지공학과) ;
  • 서선철 (용진환경) ;
  • 정재우 (경남과학기술대학교 환경공학과)
  • Received : 2019.10.17
  • Accepted : 2019.11.24
  • Published : 2019.12.20
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Abstract

Operating characteristics of a 30 L microbial electrolysis cell (MEC) for producing biogas from sewage sludge was studied. During the 32-day inoculation period, carbon dioxide concentration decreased and methane concentration increased with operating time, and the overall methane content of biogas was 69.1% with a production rate of 171.6 mL CH4/L·d. In fed-batch experiments for 6 operating cycles, CH4 concentration of 66.5~77.2% was obtained at a production rate of 184.9~372.9 mL CH4/L·d, COD, TS and VS removal efficiency ranged from 28.2 to 42.1%, 20.7 to 37.5% and 18.5 to 36.9%, respectively. The MEC system was observed to be stabilized as operating cycles were repeated after inoculation. In the last operating cycle, 5221 mL/L of methane was produced with CH4 yield of 316.7 L CH4/kg CODrem, and the energy recovery was 73%.

하수슬러지로부터 바이오가스를 생산하기 위한 30 L 규모의 미생물전기분해전지 시스템의 초기 운전특성에 관한 연구를 수행하였다. 32일간의 식종기간동안, 운전시간이 경과함에 따라 이산화탄소 농도는 감소하고 메탄농도가 증가하였으며, 69.1%의 농도를 가진 메탄가스가 171.6 mL CH4/L·d의 속도로 얻어졌다. 식종이 끝난 후에 6회의 운전 사이클동안 이루어진 회분식 실험에서, 66.5~77.2%의 농도를 가진 메탄을 184.9~372.9 mL CH4/L·d의 생산속도로 얻어졌다. COD의 제거효율은 28.2~42.1%의 범위를 가지며, TS와 VS의 제거효율은 각각 20.7~37.5%와 18.5~36.9%의 범위를 가지는 것으로 나타났다. 식종 후 운전 사이클이 반복됨에 따라 시스템의 안정화가 이루어지는 것이 관찰되었다. 마지막 운전 사이클에서 메탄의 발생량과 수율은 각각 5221 mL/L와 316.7 L CH4/kg CODrem이었으며 에너지회수율은 73%이었다.

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References

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