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미생물전기화학 혐기성소화조에서 전극간격이 메탄생성에 미치는 영향
신원범 ( Wonbeom Shin ),석붕 ( Shi Peng ),조상열 ( Sangyeol Jo ),전항배 ( Hangbae Jun ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.4
Electrode distance is a important factor for determining performance of bio-electrochemical anaerobic digestion (BEAD). In this study, the effects of electrode distances such as 0.3, 1.0, 3.0 cm on methane production, methane yield, organic matter removal efficiency, current density, coulombic efficiency, and energy efficiency were analyzed in a anaerobic digestor (AD) and BEAD reactors. COD removal efficiencies and daily methane productions in AD, BEAD(0.3), BEAD(1.0), and BEAD(3.0) reactors were 65.0, 75.8, 72.4, 68.1 % and 258, 357, 333, 276 mL/d, respectively. The current density and coulombic efficiency in BEAD reactor with electrode distance of 0.3 cm were 4.2 A/m<sup>2</sup> and 62.6 %, respectively. As the electrode distance increased from 0.3 cm to 3.0 cm, COD removal and methane production from the BEAD reactor were decreased. From these results, the electrochemical performances (such as current density, coulombic efficiency, and energy efficiency) increased as the electrode distance decreased, on the same time the methane production and COD removal efficiency also increased from the BEAD reactor with narrower electrode distance.
미생물 전기화학 기술이 적용된 단일 혐기성소화조에서 전극재질에 따른 바이오가스 생성 효율 평가
신원범(Wonbeom Shin),박준규(Jungyu Park),이범(Beom Lee),김용근(Yonggeun Kim),전항배(Hangbae Jun) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.2
최근, 미생물전기화학기술(microbial electrochemical technology, MET)을 혐기성 소화에 적용하여 바이오가스 발생량을 증대시키는 연구가 활발하게 이루어지고 있다. 하지만, 내부저항에 따른 Scale-up 측면에서는 아직 활발한 연구가 필요하며, 내부저항을 최소화하기 위한 방안으로는 전류밀도가 높은 전극의 선정, 이온강도 및 전기전도도의 증가, 다양한 전극의 형태 및 재질 선정 등이 보고되고 있다. 최근 Stainless steel은 내구성이 강할 뿐만 아니라 비용 역시 저렴하고, 특히 음극으로 사용되는 경우 백금 금속이나 탄소기반의 섬유재질의 전극과 유사한 효율이 나타남에 따라 그 관심이 높아지고 있다. 따라서, 본 연구에서는 Graphite carbon에 전기전도도 및 전류밀도, 내구성을 향상시킬 수 있는 Ni, Cu, Fe의 코팅 여부와 최근 주목받고 있는 Stainless steel 재질의 판형과 그물망 형태의 전극을 사용하여 전기화학적 특성과 바이오가스 발생량을 비교함으로서 그 효율을 평가하였다. 그 결과, 각 전극 재질에 따른 전류밀도는 GC-CM, GC, SUS-P, SUS-M이 각각 2.03, 1.36, 1.04, 1.13 A/m²으로 나타났으며, 메탄수율은 GC-CM, GC, SUS-P, SUS-M이 각각 0.27, 0.14, 0.19, 0.21 L-CH₄/g-CODrem.로 나타났다. 즉, Stainless 재질의 금속이 코팅된 Graphite carbon과 유사한 전류밀도와 메탄수율을 나타냄을 확인할 수 있었다. MET (Microbial Electrochemical Technology), such as MFC (Microbial Fuel Cell) and MEC (Microbial Electrolysis Cell), is a promising technology for producing sustainable biogas from an anaerobic digester (AD). At current stage, however, the most likely limiting factors, large internal resistances, should be overcome for successful scale up of this technology. Various researchers reported that application of electrode materials containing high current density, increase of ion strength and conductivity, configuration of electrode are good methods for minimizing internal resistances. Recently, stainless steel is receiving great attention because of not only high performance and durability but also low cost. Therefore, in this study, we evaluate electrochemical characteristics and biogas production rate using various electrode materials and configuration (graphite carbon coated with catalysts (GC-CM) or not (GC), stainless steel mesh (SUS-M) and plate (SUS-P)). As the results, current densities of GC-CM, GC, SUS-P, SUS-M were 2.03, 1.36, 1.04, 1.13 A/m², respectively. Methane yields of GC-CM, GC, SUS-P, SUS-M were 0.27, 0.14, 0.19, 0.21 L-CH₄/g-CODrem., respectively. Stainless steel shows high current density and methane yield, which are similar as graphite carbon coated with catalysts.
스폰지 및 세라믹 여재를 이용한 초기우수 여과장치의 최적설계인자 분석
조상열 ( Sangyeol Jo ),이범 ( Beom Lee ),박준규 ( Jungyu Park ),신원범 ( Wonbeom Shin ),석붕 ( Shi Peng ),전항배 ( Hang-bae Jun ) 충북대학교 산업과학기술연구소 2017 산업과학기술연구 논문집 Vol.31 No.1
Non point pollutants flowing contain various harmful substances releasing into the river water during rainfall. It is very important to control the initial storm water runoff. There are various methods to control the non point pollutants contained in the initial storm water, such as pond, wetlands, infiltration system, filtration system, and open channel system. Among them, a filtration system is an efficient and feasible system occupying relatively small site area. In this study, the optimum design parameters of an upflow filtration system using sponge and ceramic media were obtained from the betch scale experiments. As a result, 80% SS removal was possible at a filtration rate of 20m/h with 60cm depth of filter media. Recovery of head loss through backwashing, both with 30L/min of air and 30L/min of treated water. It is required for more than 7min.
수질정화장치 적용에 따른 퇴적물 특성 및 오염물질 상관관계 분석
김용근 ( Yonggeun Kim ),이범 ( Beom Lee ),박준규 ( Ungyu Park ),신원범 ( Wonbeom Shin ),정세웅 ( Se Woong Chung ),최선화 ( Seonhwa Choi ),전항배 ( Hangbae Jun ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.6
Since the stagnant reservoir water have lots of nutrients to be deposited and a small amount of water per unit area, the releasing nutrient from the sediments has a great influence on the primary production and water quality changes in the aquatic system. Thus, to manage the water quality of the reservoir, there is an increasing demand for the removal of polluted sediment accumulated on the bottom. The purpose of this study is to analyze the physical characteristics and fate of sediment nutrients before and after of the application with the water quality improvement system by selecting most reasonable points to set up and maintain easily applied to the reservoir water quality improvement. For those purpose, since a treatment system using micro-bubble and microbial media was installed, the characteristics of sediments around before and after application of the system and the efficiency of the treatment system had been evaluated. As a result, it was confirmed the soil be classified into silty loam before the installation of the water-treatment system is changed to after the installation be classified into sandy loam. It`s mean nutrient separation from sediment more easily.