대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제37권12호
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  • Pages.682-688
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  • 2015
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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하수슬러지를 기질로 하는 미생물전기분해전지에서 전극간 거리가 메탄 생산에 미치는 영향

Influence of Electrode Spacing on Methane Production in Microbial Electrolysis Cell Fed with Sewage Sludge

  • 임성원 (경남과학기술대학교 환경공학과, 녹색기술연구소) ;
  • 안용태 (경남과학기술대학교 에너지공학과) ;
  • 정재우 (경남과학기술대학교 환경공학과, 녹색기술연구소)
  • Im, Seongwon (Department of Environmental Engineering, Green Technology Institute, Gyeongnam National University of Science and Technology) ;
  • Ahn, Yongtae (Department of Energy Engineering, Gyeongnam National University of Science and Technology) ;
  • Chung, Jae-Woo (Department of Environmental Engineering, Green Technology Institute, Gyeongnam National University of Science and Technology)
  • 투고 : 2015.11.12
  • 심사 : 2015.12.23
  • 발행 : 2015.12.31
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초록

하수슬러지를 처리하는 미생물전기분해전지(Microbial electrolysis cell, MEC)의 성능에 미치는 전극간 거리의 영향에 관한 실험실 규모 실험을 수행하였다. 각각 다른 전극간 거리(16, 32 mm)를 가진 두 쌍의 전극이 설치된 MEC 반응기가 안정적으로 이루어질 때 전류발생량, 메탄발생량, 메탄수율 등 MEC 성능에 미치는 전극간 거리의 영향을 분석하였다. 전극간 거리가 16 mm일 때, 전류밀도와 메탄발생량은 각각 $3.74A/m^3$과 $0.616{\sim}0.804Nm^3/m^3$으로 전극간 거리가 32 mm인 조건에서의 $1.50{\sim}1.82A/m^3$과 $0.529{\sim}0.664Nm^3/m^3$보다 높게 나타났다. COD 및 VSS의 제거효율은 각각 34~40%와 32~38%의 범위를 가지는 것으로 나타났다. 전류밀도가 증가함에 따라 MEC의 생물전기화학적 성능이 향상되어 VSS 감소와 메탄생성이 증가하는 것으로 나타났으며 전류밀도는 VSS 제거효율보다 메탄수율에 상대적으로 큰 영향을 미치는 것으로 나타났다.

Effect of electrode spacing on the performance of microbial electrolysis cells(MECs) for treating sewage sludge was investigated through lab scale experiment. The reactors were equipped with two pairs of electrodes that have a different electrode spacing (16, 32 mm). Shorter electrode distance improved the overall performance of MEC system. With the 16 mm of electrode distance, the current density was $3.04{\sim}3.74A/m^3$ and methane production was $0.616{\sim}0.804Nm^3/m^3$, which were higher than those obtained with 32 mm of electrode spacing ($1.50{\sim}1.82A/m^3$, $0.529{\sim}0.664Nm^3/m^3$). The COD removal was in the range of 34~40%, and the VSS reduction ranged 32~38%. As the current production increased, VSS reduction and methane production were increased possibly due to the improved bioelectrochemical performance of the system. Methane production was more affected by current density than VSS reduction. These results imply that the reducing the electrode spacing can enhance the methane production and recovery from sewage sludge with the decreased internal resistance, however, it was not able to improve VSS reduction of sewage sludge.

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