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전병승,구만복,상병인,이선미,김용환,채희정 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.4
Two mesophilic trickling bed bioreactors filled with two different types of media, hydrophilic- and hydrophobic-cubes, were designed and conducted for hydrogen production under the anaerobic fermentation of sucrose. Each bioreactor consisted of the column packed with polymeric cubes and inoculated with heat-treated sludge obtained from anaerobic digestion tank. A defined medium containing sucrose was fed by the different hydraulic retention time(HRT), and recycle rate. Hydrogen concentrations in gas-phase were constant, averaging 40% of biogas throughout the operation. Hydrogen production rate was increased till 10.5 Lh-1 L-1 of bioreactor when influent sucrose concentrations and recycle rates were varied. At the same time, the hydrogen production rate with hydrophobic media application was higher than its hydrophilic media application. No methane was detected when the reactor was under a normal operation. The major fermentation by-products in the liquid effluent of the both trickling biofilters were acetate, butyrate and lactate. In order to run in the long term operation of both reactor filled with hydrophilic and hydrophobic media, biofilm accumulation on hydrophilic media and biogas produced should be controlled through some process such as periodical backwashing or gas-purging. Four sample were collected from each reactor on the opposite hydrogen production rate, and their bacterial communities were compared by terminal restriction fragment length polymorphism (T-RFLP) analysis of PCR products generated using bacterial 16s rRNA gene primers (8f and 926r). It was expressed a marked difference in bacterial communities of both reactors. The trickling bed bioreactor with hydrophobic media demonstrates the feasibility of the process to produce hydrogen gas. A likely application of this reactor technology can be hydrogen gas recovery from pre-treatment of high carbohydrate-containing wastewaters.
Genome and RNA transcriptome analysis of hexanoic acid producing Caproiciproducens galactiolivorans
전병승,김현진,상병인 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Hexanoic acid producing Caproiciproducens galactitolivorans was isolated from sludge of waste water treatment plant. The strain produces hexanoic acid to 90g/L from galactitol in extractive fermentation. In contrast to this, the strain produces lower hexanoic acid in conditions using other cheaper carbohydrates such as glucose. Therefore, in order to investigate genomic characteristics by addition of carbohydrates, the whole genome of this strain was analyzed and RNA expression levels were compared by addition of galactitol and glucose. Genome size and codon sequence number of the strain`s genome were 2,622,912bp and 2,516, respectively. Codon sequences were annotated using genome data base and important genes were investigated. Through this process, two important gene clusters were found. These genes were expressed together in Escherichia coli so as to confirm whether the gene cluster was related to hexanoic acid production indeed. The strain produced hexanoic acid.
Performance comparison of two newly isolated Methanothermobacter for Power-to-Gas system
전병승,홍문기,주고운,김민정,송효정,최옥경,상병인 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Power-to-Gas(P2G) is the one of systems storing electricity. Using this system, load fluctuations due to utilizing renewable energy can be appropriately coped. In this system, surplus electricity produced from renewable source can be converted into hydrogen by water-electrolysis and produced hydrogen would be utilized to methane along with carbon dioxide. In this study, two hydrogenotrophic methangen that are applicable to biological methane production was isolated from sludge and the performance for methane production was evaluated in same condition. Minimal medium such as basic anaerobic medium was utilized for cell maintenance and methane evaluation. Carbon dioxide and hydrogen were supplied as a carbon and energy source at various ratio and rate. Produced methane and cell growth was analysed using GC-TCD and spectrophotometer by time course, respectively. Based on these results, methanogen suitable for P2G system could be selected.
생물학적 수소생산을 위한 Trickling Bed Biofilter에서의 친수성과 소수성 담체의 영향
전병승(Jeon, Byung-Seung),이선미(Lee, Sun-Mi),김용환(Kim, Yong-Hwan),채희정(Chae, Hee-Jeong),상병인(Sang, Byoung-In) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
Two mesophilic trickling bed bioreactors filled with two different types of media, hydrophilic- and hydrophobic-cubes, were designed and tested for hydrogen production via anaerobic fermentation of sucrose. Each reactor consisted of a column packed with polymeric cubes and inoculated with heat-treated sludge obtained from anaerobic digestion tank. A defined medium containing sucrose was fed with changing flow rate into the capped reactor, hydraulic retention time and recycle rate. Hydrogen concentrations in gas-phase were constant, averaging 40% for all conditions tested. Hydrogen production rates increased up to 10.5 L{cdot};h^{-1}{cdot}L^{-1} of reactor when influent sucrose concentrations and recycle rates were varied. Hydrophobic media provided higher value of hydrogen production rate than hydrophilic media at the same operation conditions. No methane was detected when the reactor was under a normal operation. The major fermentation by-products in the liquid effluent of the both trickling biofilters were acetate and butyrate. The reactor filled with hydrophilic media became clogged with biomass and bio gas, requiring manual cleaning of the system, while no clogging occurred in the reactor with hydrophobic media. In order to make long-term operation of the reactor filled with hydrophilic media feasible, biofilm accumulation inside the media in the reactor with hydrophilic media and biogas produced from the reactor will need to be controlled through some process such as periodical backwashing or gas-purging. These tests using trickling bed biofilter with hydrophobic media demonstrate the feasibility of the process to produce hydrogen gas in a trickle-bed type of reactor. A likely application of this reactor technology could be hydrogen gas recovery from pre-treatment of high carbohydrate-containing wastewaters.