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미생물 역전기 투석 셀에서 역전기 투석 스택 유량에 따른 영향 및 전기화학 연구
( Tran Viet Hoa Huong ),정석희 ( Jung Sokhee ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
An MRC is a bio-electrochemical system combining a microbial fuel cell (MFC) with a RED stack to generate electricity from salinity gradient and organic wastewater with simultaneous treatment. Operating an MRC at an optimum flow rate to RED is important because it is closely related with energy production rate and economic feasibility. However, influence of RED flowrates on MRC electrochemistry and power production have not been investigated. For this purpose, four different flowrates of high concentration and low concentration solutions were tested. Maximum power density was highest in 10 mL/min (3.71 W/m<sup>2</sup>) and optimum current density was highest in 7.5 mL/min (5.36 A/m<sup>2</sup>). By mere increasing the flowrate to MRC, maximum power and optimum current densities increased by 17.7% and 16.2%. EIS showed that impedances of anode, cathode and full-cell were decreased by 51%, 31% and 19%, respectively. Anode CV showed that peak current density was increased by 25.7%. COD removal and CE were not affected by RED flowrate. Power generation at 7.5 mL/min and 10 mL/min were not so different, but current production was better at 7.5 mL/min. Therefore, considering energy production, the RED flowrate of 7.5 mL/min is a reasonable choice for MRC operation.
미생물 역전기 투석 셀에서 역전기 투석 스택 유량에 따른 영향 및 전기화학 연구
( Tran Viet Hoa Huong ),정석희 ( Jung Sokhee ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
An MRC is a bio-electrochemical system combining a microbial fuel cell (MFC) with a RED stack to generate electricity from salinity gradient and organic wastewater with simultaneous treatment. Operating an MRC at an optimum flow rate to RED is important because it is closely related with energy production rate and economic feasibility. However, influence of RED flowrates on MRC electrochemistry and power production have not been investigated. For this purpose, four different flowrates of high concentration and low concentration solutions were tested. Maximum power density was highest in 10 mL/min (3.71 W/m<sup>2</sup>) and optimum current density was highest in 7.5 mL/min (5.36 A/m<sup>2</sup>). By mere increasing the flowrate to MRC, maximum power and optimum current densities increased by 17.7% and 16.2%. EIS showed that impedances of anode, cathode and full-cell were decreased by 51%, 31% and 19%, respectively. Anode CV showed that peak current density was increased by 25.7%. COD removal and CE were not affected by RED flowrate. Power generation at 7.5 mL/min and 10 mL/min were not so different, but current production was better at 7.5 mL/min. Therefore, considering energy production, the RED flowrate of 7.5 mL/min is a reasonable choice for MRC operation.
외기 환원전극 활성탄 촉매의 물리화학적 처리에 의한 미생물 연료전지 성능 평가
( Tran Viet Hoa Huong ),정석희 ( Jung Sokhee ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Microbial Fuel cell (MFC) is an innovative electrochemical system, being developed for an energy positive wastewater treatment process for a sustainable society. Development of cathode technology is very important for practical use of MFC. In this study, for developing practical cathode catalyst technology, physico-chemically modified activated carbon catalysts and platinum were tested for performance and electrochemical characterization in an MFC under a same condition, potentially to replace expensive platinum catalysts. Comparing with a maximum power density of a platinum-coated cathode (976 mW/m<sup>2</sup>), a Co-N-C/AC cathode made with activated carbon doped with cobalt and 1,10-phenanthroline at 800 ℃ produced 1,526 mW/ m<sup>2</sup> in the MFC condition, which was 56% higher than the Pt-coated cathode. A 500AC cathode made with heat-treated activated carbon at 500 ℃ produced 1,394 mW/m<sup>2</sup> and non-treated activated carbon cathode (Plain AC) produced 1,014 mW/m<sup>2</sup>. The tested activated-carbon electrodes showed electrochemical performance and power production superior to the Pt-coated cathode. Electrochemical performance of cathodes was increased as more physico-chemical treatments were added to activated carbon catalysts. Cathode impedance results showed that enhanced electrochemical performance was attributed to decrease of cathode charge transfer resistance, possibly due to the physical-chemical modification of activated carbon and the catalyst change.
외기 환원전극 활성탄 촉매의 물리화학적 처리에 의한 미생물 연료전지 성능 평가
( Tran Viet Hoa Huong ),정석희 ( Jung Sokhee ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Microbial Fuel cell (MFC) is an innovative electrochemical system, being developed for an energy positive wastewater treatment process for a sustainable society. Development of cathode technology is very important for practical use of MFC. In this study, for developing practical cathode catalyst technology, physico-chemically modified activated carbon catalysts and platinum were tested for performance and electrochemical characterization in an MFC under a same condition, potentially to replace expensive platinum catalysts. Comparing with a maximum power density of a platinum-coated cathode (976 mW/m<sup>2</sup>), a Co-N-C/AC cathode made with activated carbon doped with cobalt and 1,10-phenanthroline at 800 ℃ produced 1,526 mW/ m<sup>2</sup> in the MFC condition, which was 56% higher than the Pt-coated cathode. A 500AC cathode made with heat-treated activated carbon at 500 ℃ produced 1,394 mW/m<sup>2</sup> and non-treated activated carbon cathode (Plain AC) produced 1,014 mW/m<sup>2</sup>. The tested activated-carbon electrodes showed electrochemical performance and power production superior to the Pt-coated cathode. Electrochemical performance of cathodes was increased as more physico-chemical treatments were added to activated carbon catalysts. Cathode impedance results showed that enhanced electrochemical performance was attributed to decrease of cathode charge transfer resistance, possibly due to the physical-chemical modification of activated carbon and the catalyst change.