Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Electric Power Generation and Treatment Efficiency of Organic Matter on Hydraulic Retention Time in Microbial Fuel Cell Reactor

미생물 연료전지 반응조의 수리학적 체류시간에 따른 유기물질 처리효율과 전력생산

  • Choi, Chansoo (Department of Applied Chemistry, Daejeon University) ;
  • Lim, Bongsu (Department of Environmental Engineering, Daejeon University) ;
  • Xu, Lei (Department of Environmental Engineering, Daejeon University) ;
  • Song, Gyuho (Department of Applied Chemistry, Daejeon University)
  • 최찬수 (대전대학교 응용화학과) ;
  • 임봉수 (대전대학교 환경공학과) ;
  • 서뢰 (대전대학교 환경공학과) ;
  • 송규호 (대전대학교 응용화학과)
  • Received : 2008.10.01
  • Accepted : 2009.01.05
  • Published : 2009.01.30
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Abstract

This study has been attempted to generate electricity, while simultaneously treating artificial organic wastewater using both batch and continuous microbial fuel cells (MFCs). In the batch MFC, current-voltage curve showed an onset potential of -0.69 V vs. Ag/AgCl. The potential range between this potential and 0 potential displayed an available voltage for an automatic production of electric energy and glucose, which was oxidized and treated at the same time. The 486 mg/L glucose solution showed the maximum power of $30mW/m^2$ and the maximum current density of $75mA/m^2$ shown in the power curve. As a result, discharging of the cell containing COD 423 mg/L at the constant current density of $60mA/m^2$ showed a continuous electricity generation for about 22 hours that dropped rapidly due to dissipating of organic material. Total electric energy production was 18.0 Wh. While discharging, the pH change was low and dropped from pH 6.53 to 6.20 then increased to 6.47, then stabilized at this charge. The COD treatment efficiency was found to be 72%. In the continuous MFC, COD removal tends to increase as the hydraulic retention time is increased. At one day of hydraulic retention time as the maximum value reaches the COD removal efficiency, power production rate and power production rate per COD removal that were obtained were 68.8%, $14mW/m^2$, and $20.8mW/m^2/g$ CODrm, respectively. In the continuous MFC, the power production rate per COD removal increases as the hydraulic retention time is increased and decreases as the organic loading rate is increased. At the values lower than an organic loading rate of $1kgCOD/m^3/d$, the values higher than about $18.1mW/m^2/g$ CODrm could be obtained.

Keywords

Acknowledgement

Supported by : 대전환경기술개발센터

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