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Park, Jungyu,Lee, Beom,Shin, Wonbeom,Jo, Sangyeol,Jun, Hangbae Elsevier 2018 Journal of cleaner production Vol.188 No.-
<P><B>Abstract</B></P> <P>Psychrophilic bio-electrochemical anaerobic digestion (PBEAD) is a promising new technology for improving methane production at low temperatures via supply of low energy. In this study, a PBEAD reactor operating at 19.8 ± 2.9 °C equipped with a low-cost stainless steel (SUS304) rotating impeller electrode was manufactured to observe the efficiency of methane production and changes in archaeal communities at a high organic loading rate (OLR). Stable methane production was achieved without VFA accumulation and pH decrease in the PBEAD reactor up to an OLR of 4.5 kg/m<SUP>3</SUP>·d owing to H<SUB>2</SUB>-dependent methylotrophic and hydrogenotrophic methanogens, which converted H<SUB>2</SUB> into methane. In the case of an OLR of 6.0 kg/m<SUP>3</SUP>·d, methane production decreased significantly due to decreased pH and accumulated VFAs, but recovered on increasing the alkalinity. The maximum energy efficiency of 71.7% confirmed the high performance of the PBEAD reactor equipped with an SUS304 rotating impeller electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Stainless steel impeller electrode was used as a cost-efficient and maintainable material. </LI> <LI> Stable methane production achieved in PBEAD reactor. </LI> <LI> PBEAD reactor prevents pH decrease and VFAs accumulation. </LI> <LI> H<SUB>2</SUB>-dependant methylotrophic and hydrogenotrophic methanogens were dominated in PBEAD reactor. </LI> </UL> </P>
Park, Jungyu,Lee, Beom,Shin, Wonbeom,Jo, Sangyeol,Jun, Hangbae Elsevier 2018 Bioresource technology Vol.259 No.-
<P><B>Abstract</B></P> <P>In this study, a practical bioelectrochemical anaerobic digestion (BEAD) reactor equipped with a rotating STS304 impeller was tested to verify its methane production performance. Methane production in the BEAD reactor was possible without accumulation of volatile fatty acids (VFAs) and decreases in pH at high organic loading rates (OLRs) up to 6 kg-COD/m<SUP>3</SUP>·d (COD: chemical oxygen demand). Methane production in a BEAD-O (open circuit) reactor was inhibited at OLRs above 4 kg-COD/m<SUP>3</SUP>·d; however, the performance could be recovered bioelectrochemically by supplying voltage. The population density of hydrogenotrophic methanogens increased to 73.3% in the BEAD-C (closed circuit) reactor, even at high OLRs, through the removal of VFAs and conversion of hydrogen to methane. The energy efficiency in the BEAD-C reactor was 85.6%, indicating that the commercialization of BEAD reactors equipped with rotating STS304 impeller electrodes is possible.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rotating-anode bioelectrochemical anaerobic digestion (BEAD) reactor was devised. </LI> <LI> Stainless steel used as a cost-effective and durable electrode material. </LI> <LI> BEAD-C produced CH<SUB>4</SUB> without pH decrease or VFA accumulation at high OLRs. </LI> <LI> CH<SUB>4</SUB> production recovered in BEAD-O with supplied voltage at high OLRs. </LI> <LI> Voltage-induced hydrogenotrophic methanogenesis in BEAD-C gave stable CH<SUB>4</SUB> yields. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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.
Converting a Host Receptor into Sustained Intranasal Virucides against SARS-CoV-2 Using Nanodiscs
Jaehyeon HWANG,Wonbeom PARK,Soomin KIM,SeungJoo KIM,Suhyun KIM,Nayoon CHOI,Eunkhang PARK,Hwanju KIM,Mina KIM,Hyunjoo CHOO,Soyun CHOI,MinKyeom KIM,YeonJin CHO,Dae-Hyuk KWEON 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.10