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호기성 분해, 혐기성 분해 및 독성을 고려한 생분해도 지표 개발
유규선,신항식 대한상하수도학회 2010 상하수도학회지 Vol.24 No.5
More than 8 millions of chemical have been used for human activities and lots of chemicals can not be degraded by microbial activities in this world. To show the biodegradability of a chemical, biodegradability index (B.I.) is suggested using aerobic biodegradability by BOD5/COD, anaerobic biodegradability by methane potential (M.P.) and toxicity by the luminiscent bacteria. In this study, PVA (polyvinyl alcohol), HEC (hydroxy ethyl cellulose), 2,4,6-TCP (tri-chloro phenol) and 2,4-DCP (di-chloro phenol) are used for test chemicals. Though they show little toxicity, PAV and HEC have low B.I. because they are polymers having high molecular weight. That means that there are no bacteria that has enzyme to degrade polymer molecules. Also, anaerobic treatment is suggested better than aerobic treatment from B.I. 2,4,6-TCP and 2,4-DCP show high toxicity and have low B.I. Their low biodegradabilities seem to be originated from their toxicities. If B.I. is used in wastewater treatment, better treatment process can be suggested and finally it can lead our society to make more environment-friendly chemicals.
표면부유 공기양극 미생물연료전지에서 유량 및 전극 면적비에 따른 전력생산 특성
유규선,송영채,우정희,정재우,이채영 대한상하수도학회 2011 상하수도학회지 Vol.25 No.4
Surface floating air cathode microbial fuel cell (MFC) having horizontal flow was developed for the application of MFC technology. RVC (Reticulated vitreous carbon) coated with anyline was used as anode electrode and carbon cloth coated with Pt (5.0 g Pt/m2, GDE LT250EW, E-TEK) was used as cathode electrode. As results of continuous operation with changing the flow rate from 4.3 mL/min to 9.5 mL/min, maximum power density of 4.5 W/m^3 was acquired at 5.4 mL/min, which was at 0.35 m/hr of flow velocity under anode electrode. When the ratio of cathode surface area to anode surface area(Ac/Aa) was changed to 1.0, 0.5, and 0.25, the maximum power density of 2.7 W/m^3 was shown at the ratio of 1.0. As the ratio decreased from 1.0 to 0.25, the power density also decreased, which is caused by increasing the internal resistance resulted from reducing the surface area to contact with oxygen. Actually, internal resistances of the ratio of 1.0, 0.5, and 0.25 were 63.75Ω, 142.18Ω, and 206.12Ω, respectively
공기양극 미생물연료전지 시스템에서 전력발생특성에 미치는 전기전도도와 CNT 양극의 영향
유규선,박현수,송영채,우정희,이채영,정재우,Yoo, Kyu-Seon,Park, Hyun-Soo,Song, Young-Chae,Woo, Jung-Hui,Lee, Chae-Young,Chung, Jae-Woo 대한상하수도학회 2012 상하수도학회지 Vol.26 No.3
The characteristics of power generation were investigated by changing the electrical conductivity from 10 to 40mS/cm using air-cathode microbial fuel cell, which had graphite fiber fabric(GFF) anode. There were three kinds of cathode used: one was carbon cloth cathode coated with Pt, another was carbon nanotube(CNT) cathode with non-precious catalyst of Fe-Cu-Mn, and the other was carbon nanotube(CNT) cathode without any catalyst. When it was operated in batch mode, power density of 1369.5mW/$m^2$ was achieved at conductivity of 20mS/cm. Power density from MFC with CNT cathode coated with multi-catalyst of Fe-Cu-Mn was shown about 985.55mW/$m^2$, which was 75.1% compared the power density of carbon cloth coated with Pt. This meant that CNT cathode coated with multi-catalyst of Fe-Cu-Mn could be an alternative of carbon cloth cathode.
유규선 전주대학교 공학기술종합연구소 2002 전주대학교 공학기술종합연구소 학술논문집 Vol.8 No.1
In this study, the substrate transfer was simulated using mathematical biofilm model. There were four special cases: base case, oxygen limitation, biomass limitation, and internal transport limitation. The removal rate of substrate was greatly affected by Oxygen limitation. Biomass limitation has no effect on the removal of substrate because effective micro-organisms grew so fast by sufficient supply of oxygen. In case of internal transport limitation, there was no effect on the total removal rate of substrate but the concentration difference between top and bottom of biofilm was very high.