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침지식 미생물연료전지(S-MFC)에서 효율적인 전력생산을 위한 다양한 영향인자 평가
김홍석 ( Hongsuck Kim ),김병군 ( Byunggoon Kim ),이륜경 ( Ryunkyung Lee ),김대현 ( Daehyun Kim ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.4
Large scale submerged microbial cells (S-MFCs) were evaluated with regard to types of reactors, surface areas of anodes and cathodes and materials of a cathode for improving the power. A settling type (upflow type) showed higher power density than channel type due to the smooth transfer of H+ (proton) and lower internal resistance. At the same surface area ratio of anodes and cathodes (1:1), the power density normalized by the anode surface area (W/㎡) of 1 sheet of an anode (705 cm2) was 5 times higher than that of 4 sheets of anodes (2,820 cm2). Both at the cathode surface areas of 15 cm2 (5×3 cm) and 9 cm2 (3×3 cm), owing to larger contact surface area for the air, a S-MFC which applied 15 cm2 of cathodes showed the improved power density. Also, applying cathodes which use CDI (capacitive deionization) electrode (graphite foil + activated carbon) resulted in higher power density than SUS mesh + expanded graphite + CNT (carbon nano tube) due to the low internal resistance. The results of this study suggest that a cost effective S-MFC could be applied to the large scale of plants with optimum operating condition.
생물환원전극 미생물연료전지에서 외부저항 및 유입부하에 따른 유기물 및 질소 제거와 전기생산에 미치는 영향
김지연 ( Jiyeon Kim ),김병군 ( Byunggoon Kim ),김홍석 ( Hongsuck Kim ),윤주환 ( Zuwhan Yun ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.5
In order to remove the organic substances and the nitrate-nitrogen contained in wastewater, some researchers have studied the simultaneous removal of organics and nitrogen by using different biocathode microbial fuel cells (MFCs). The operating conditions for removing the contaminants in the MFCs are the external resistances, HRTs, the concentration of the influent wastewater, and other factors. This study aimed to determine the effect of the external resistors and organic loading rates, from the changing HRT, on the removal of the organics and nitrogen and on the production of electric power using the Denitrification Biocathode - Microbial Fuel Cell (DNB-MFC). As regards the results of the study, the removal efficiencies of SCODCr did not show any difference, but the nitrate-nitrogen removal efficiencies were increased by decreasing the external resistance. The maximum denitrification rate achieved was 129.2 ± 13.54 g NO3 --N/m3/d in the external resistance 1 Ω, and the maximum power density was 3,279 mW/m3 in 10 Ω. When the DNB-MFC was operated with increasing influent organic and nitrate loading by reducing the HRTs, the NO3 --N removal efficiencies were increased linearly, and the maximum nitrate removal rate was 1,586 g NO3 --N/m3/d at HRT 0.6 h.