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Yu, Jaecheul,Park, Younghyun,Kim, Byunggoon,Lee, Taeho Springer-Verlag 2015 BIOPROCESS AND BIOSYSTEMS ENGINEERING Vol.38 No.1
<P>Single-chamber microbial fuel cells (MFCs) acclimated with glucose, butyrate, propionate, acetate, and a mixture of the four were operated with brewery wastewater (BWW) under a fed-batch mode. Glucose-fed MFC (GW-MFC) showed the highest maximum power density (PDmax) of 1,519??mW/m(2), followed in order by acetate-fed MFC (AW-MFC), mixed substrates-fed MFC (MW-MFC), butyrate-fed MFC (BW-MFC), and propionate-fed MFC (PW-MFC). After changing to BWW, power production was decreased for all MFCs. MFC acclimated with glucose showed the highest PDmax of 890??±??12 mW/m(2), followed in order by MW-MFC, AW-MFC, BW-MFC, and PW-MFC. The PDmax in BWW-MFC, which was acclimated and operated with BWW, of 552??mW/m(2) was less than that of GW-MFC and MW-MFC but more than that of AW-MFC, BW-MFC, and PW-MFC. MFCs with fermentable substrates were less affected by the BWW. Gammaproteobacteria, including Pseudomonas sp., Acinetobacter sp. and Xanthomonas axonopodis, were found in all MFCs with pure substrates and Rubrivivax benzoatilyticus, thiobacillus sp. and Denitratisoma oestradiolicum belonging to Betaproteobacteria were newly detected in all MFCs when the substrate was changed to BWW.</P>
Yu, Jaecheul,Park, Youghyun,Lee, Taeho Published by Stockton Press on behalf of the Socie 2015 Journal of industrial microbiology & biotechnology Vol.42 No.7
<P>A closed-circuit microbial fuel cell (C-MFC) was operated to investigate the electron flux under fed-batch mode, and the results were compared to those of open-circuit MFC (O-MFC) and a fermentation reactor (F-reactor). The current was the largest electron sink (52.7% of influent SCOD) in C-MFC, whereas biomass and methane gas were the most significant electron sinks in O-MFC and F-reactor. Interestingly, some of the unknown sink may have accumulated in the electrode of O-MFC. Principal component analysis based on gradient gel electrophoresis profiles showed that the microbial communities were significantly affected by the growth conditions and the presence of electrode, regardless of the circuit connection. Therefore, the electrode and circuit mode might help to control the amount of biomass and enhance the MFC performance.</P>
Yu, Jaecheul,Cho, Sunja,Kim, Sunah,Cho, Haein,Lee, Taeho Japanese Society of Microbial Ecology/The Japanese 2012 Microbes and environments Vol.27 No.1
<P>In a microbial fuel cell (MFC), exoelectrogens, which transfer electrons to the electrode, have been regarded as a key factor for electricity generation. In this study, U-tube MFC and plating methods were used to isolate exoelectrogens from the anode of an MFC. Disparate microorganisms were identified depending on isolation methods, despite the use of an identical source. Denaturing gel gradient electrophoresis (DGGE) analysis showed that certain microorganisms became dominant in the U-tube MFC. The predominant bacterium was similar to <I>Ochrobactrum</I> sp., belonging to the <I>Alphaproteobacteria</I>, which was shown to be able to function as an exoelectrogen in a previous study. Three isolates, one affiliated with <I>Bacillus</I> sp. and two with <I>Paenibacillus</I> sp., were identified using the plating method, which belonged to the Gram-positive bacteria, the <I>Firmicutes</I>. The U-tube MFCs were inoculated with the three isolates using the plating method, operated in the batch mode and the current was monitored. All of the U-tube MFCs inoculated with each isolate after isolation from plates produced lower current (peak current density: 3.6–16.3 mA/m<SUP>2</SUP>) than those in U-tube MFCs with mixed culture (48.3–62.6 mA/m<SUP>2</SUP>). Although the isolates produced low currents, various bacterial groups were found to be involved in current production.</P>
식물-미생물전기화학 기반의 미활용 에너지 회수 기초 연구
유재철 ( Jaecheul Yu ),신춘환 ( Choon Hwan Shin ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.2
In this study, we evaluated the energy production from plant-microbial fuel cells using representative indoor plants, such as Scindapsus aureus and Clatha minor. The maximum power density of microbial fuel cell (MFC) using S. aureus (3.36 mW/㎡) was about 2 times higher than that of the MFC using C. minor (1.43 mW/㎡). It was confirmed that energy recovery is possible using plant-MFCs without fuel. However, further research is needed to improve the performance of plant-MFCs. Nevertheless, plant-MFCs have proved their potential as a novel energy source to overcome the limitations of the conventional renewable energy sources such as wind power and solar cells, and could be employed to a power source for the sensor in charge of the fourth industrial revolution.