Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Evaluation of Anaerobic Fermentation and Nitrate Removal Efficiency of Sewage Sludge Pre-treated with Electrolysis

전기분해 전처리 슬러지의 혐기성 소화 및 질산염 제거효율 평가

  • Kim, Jaehyung (Graduate School of Energy & Environment, Seoul National University of Science and Technology) ;
  • Jeon, Hyeyeon (Graduate School of Energy & Environment, Seoul National University of Science and Technology) ;
  • Pak, Daewonk (Graduate School of Energy & Environment, Seoul National University of Science and Technology)
  • 김재형 (서울과학기술대학교 에너지환경대학원) ;
  • 전혜연 (서울과학기술대학교 에너지환경대학원) ;
  • 박대원 (서울과학기술대학교 에너지환경대학원)
  • Received : 2014.02.03
  • Accepted : 2014.03.12
  • Published : 2014.03.31
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Abstract

This study was performed with electrolysis treatment method for improving anaerobic digestion gas production efficiency in a sewage sludge, thereby confirmed in anaerobic digestion production and denitrification effect. As a result, solubilization was increased by increasing treatment time of electrolysis and current density, also showed to be 9.02% with 10 mA/cm2 of current density in 4 mm electrode distance. Based on the results of BMP test used the above experiment, methane production was 0.49 L CH4/g VS, and increased by 88.4% compared with control groups. As for the results of denitrification using the sewage sludge treated with the same conditions, denitrification rate appeared $19.2mg\;NO_3{^{-}}N/g\;MLVSS{\cdot}hr$, and through the sewage sludge treated with electrolysis, it can be applied to anaerobic digestion and denitrification process by increasing biodegradation.

본 연구에서는 하수슬러지의 소화가스 생산 효율향상을 위해 전기분해 처리방법을 수행하고 이를 소화가스 생산과 탈질실험 효과를 확인하였다. 전기분해 처리시간, 전류밀도가 증가함에 따라 가용화율은 증가하였으며 전극간격 4 mm에서 전류밀도 10 mA/cm2로 60분 처리 시 가용화율은 9.02%를 보였다. 이를 이용하여 BMP실험을 진행한 결과 0.49 L CH4/g VS의 메탄생산량을 보이며 대조군대비 88.4% 증가함을 보였다. 같은 조건으로 처리된 하수슬러지를 이용하여 탈질실험을 진행한 결과 $19.2mg\;NO_3{^{-}}N/g\;MLVSS{\cdot}hr$의 탈질율을 보였으며 이를 통해 전기분해 처리된 하수슬러지는 생분해성이 증대됨에 따라 혐기성소화와 탈질공정에도 적용이 가능한 것으로 확인되었다.

Keywords

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