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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>
Park, Jungyu,Lee, Beom,Tian, Donjie,Jun, Hangbae Elsevier Applied Science 2018 Bioresource technology Vol.247 No.-
<P><B>Abstract</B></P> <P>A microbial electrolysis cell (MEC) is a promising technology for enhancing biogas production from an anaerobic digestion (AD) reactor. In this study, the effects of the MEC on the rate of methane production from food waste were examined by comparing an AD reactor with an AD reactor combined with a MEC (AD+MEC). The use of the MEC accelerated methane production and stabilization via rapid organic oxidation and rapid methanogenesis. Over the total experimental period, the methane production rate and stabilization time of the AD+MEC reactor were approximately 1.7 and 4.0 times faster than those of the AD reactor. Interestingly however, at the final steady state, the methane yields of both the reactors were similar to the theoretical maximum methane yield. Based on these results, the MEC did not increase the methane yield over the theoretical value, but accelerated methane production and stabilization by bioelectrochemical reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Steady-state methane production of AD and AD+MEC was near the theoretical maximum. </LI> <LI> MEC can accelerate the methane production rate and stabilization. </LI> <LI> MEC promotes the conversion of hydrogen ions and volatile fatty acids to methane. </LI> <LI> AD+MEC showed better organic matter removal via increased exoelectrogenic bacteria. </LI> <LI> MEC eliminates factors inhibiting acetoclastic methanogenesis in bulk. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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,Shi, Peng,Kwon, Hyejeong,Jeong, Sang Mun,Jun, Hangbae Elsevier Applied Science 2018 Bioresource technology Vol.259 No.-
<P><B>Abstract</B></P> <P>In this study, the metabolism of methanol and changes in an archaeal community were examined in a bioelectrochemical anaerobic digestion sequencing batch reactor with a copper-coated graphite cathode (BEAD-SBR<SUB>Cu</SUB>). Copper-coated graphite cathode produced methanol from food waste. The BEAD-SBR<SUB>Cu</SUB> showed higher methanol removal and methane production than those of the anaerobic digestion (AD)-SBR. The methane production and pH of the BEAD-SBR<SUB>Cu</SUB> were stable even under a high organic loading rate (OLR). The hydrogenotrophic methanogens increased from 32.2 to 60.0%, and the hydrogen-dependent methylotrophic methanogens increased from 19.5 to 37.7% in the bulk of BEAD-SBR<SUB>Cu</SUB> at high OLR. Where methanol was directly injected as a single substrate into the BEAD-SBR<SUB>Cu</SUB>, the main metabolism of methane production was hydrogenotrophic methanogenesis using carbon dioxide and hydrogen released by the oxidation of methanol on the anode through bioelectrochemical reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> BEAD-SBR<SUB>Cu</SUB> produced methanol from food waste increasing methylotrophic methanogens. </LI> <LI> BEAD-SBR<SUB>Cu</SUB> removed COD and produced methane with no pH decrease at high OLR. </LI> <LI> Methanol is converted to methane by hydrogenotrophic and methylotrophic methanogens. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
멀티녹조제거장치와 스키머를 이용한 정체수역에서의 조류 제거 효율평가
박준규 ( Jungyu Park ),전항배 ( Hangbae Jun ) 충북대학교 산업과학기술연구소 2016 산업과학기술연구 논문집 Vol.30 No.2
Dispersion by using ship disturbance and water spread device is applied in stagnant water, which often occurs scum and band of highly concentrated green algae. However, these methods cause reoccurrence of algae on downstream because of the concepts of these are not to remove but to spread. In addition, most fields-applied devices are not to anticipate complex performance but to solve single problem. They have problems such as high maintenance cost, low removal efficiency and so on. Therefore, development for removing algae completely through external drain and for expecting multi performance through a single device is necessary. In this study, we conducted experiments for removing algae completely using a multi algae removal device and skimmer. As the results, DO supply, coagulation and flotation of algae floc, water dispersion, drain of algae scum and band using multi algae removal device and skimmer were effective.
미생물 전기화학 기술이 설치된 단일 혐기성소화조에서 유기성폐기물로부터 메탄생성
박준규(Jungyu Park),전동걸(Dongjie Tian),이범(Beom Lee),전항배(Hangbae Jun) 大韓環境工學會 2016 대한환경공학회지 Vol.38 No.4
Glucose (C6H12O6)의 이론적인 최대 메탄수율은 표준상태(1 atm, 0℃)를 기준으로 0.35 LCH₄/gCOD이지만, 전통적인 혐기성소화조에서 유기물이 메탄으로 전환되는 양은 연구의 방법이나 유기물의 종류에 따라 매우 다양하게 보고되고 있으며, 대부분의 연구실 규모 실험에서 안정화 후 메탄 수율은 0.35 LCH₄/gCOD 이하로 나타난다. 최근, 미생물 전기화학 기술(Microbial Electrochemical Technology, MET)은 지속가능한 신재생에너지 생산 기술로서 큰 주목을 받고 있으며, MET를 혐기성소화조에 적용할 경우 고농도의 유기성폐기물의 빠른 분해가 가능할 뿐만 아니라 전기화학적인 반응에 의해 휘발성지방산(VFAs)이나 독성물질, 생분해 불가능한 물질까지도 분해가 가능하며, 소화조 내 미생물의 활성을 높이고 바이오가스의 생산량을 극대화 할 수 있다고 알려져 있다. 본 연구에서는 MET가 혐기성소화의 메탄발생에 미치는 영향에 대하여 연구하기 위해 음식물 탈리액과 하수슬러지의 원소조성에 따른 이론적인 최대 메탄수율을 분석하였으며, BMP (Biochemical Methane Potential) 실험과 연속식 실험을 통한 메탄수율의 특성을 평가하였다. 그 결과, MET가 적용된 혐기성소화에서의 메탄수율은 일반적인 혐기성소화조에 비하여 기질에 따라 2-3배 정도 높았으며, 이론적인 최대 메탄수율에 미치지는 못하였으나 일부는 거의 근접한 결과가 도출되었다. 또한, 일반적인 혐기성소화조와 MET가 적용된 혐기성소화조의 안정화 후 바이오가스의 조성은 거의 유사하게 나타났다. 결과적으로, MET가 혐기성소화조의 유기물 제거효율을 향상시켜 메탄발생량을 증가시킨 것으로 나타났으며, 향후 추가적인 연구를 통하여 MET에서 메탄발생 메카니즘이 명확히 규명되어야 할 것이다. Theoretical maximum methane yield of glucose at STP (1 atm, 0℃) is 0.35LCH₄/gCOD. However, most researched actual methane yields of anaerobic digester (AD) on lab scale is lower than theoretical ones. A wide range of them have been reported according to experiments methods and types of organic matters. Recent year, a MET (Microbial electrochemical technology) is a promising technology for producing sustainable bio energies from AD via rapid degradation of high concentration organic wastes, VFAs (Volatile Fatty Acids), toxic materials and non-degradable organic matters with electrochemical reactions. In this study, methane yields of food waste leachate and sewage waste sludge were evaluated by using BMP (Biochemical Methane Potential) and con-tinuous AD tests. As the results, methane production volume from the anaerobic digester equipped with MET (AD+MET) was higher than conventional AD in the ratio of 2 to 3 times. The actual methane yields from all experiments were lower than those of theoretical value of glucose. The methane yield, however, from the AD+MET occurred similar to the theoretical one. Moreover, biogas compositions of AD and AD+MET were similar. Consequently, methane production from anaerobic digester with MET increased from the result of higher organic removal efficiency, while, further researches should be required for investigating methane production mechanisms in the anaerobic digester with MET.