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미세조류 고농축 수확 공정을 위한 회전체 장착형 분리막여과
김교찬,장용근 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.05
Membrane filtration has been considered as an promising harvesting technology in the fields of microalgal biorefinery to produce biofuels and valuable chemicals from microalgal biomass. For developing the effective membrane-based harvesting process to produce highly concentrated biomass, membrane fouling should be controlled because it leads to not only reduced filtration rate but also insufficient reachable concentration of harvested biomass for downstream process. For that, a dynamic filtration using a rotating disk was evaluated in this study, efficiently generating high shear flow near the membrane surface by an independently moving part. It was demonstrated to achieve feasible filtration performance even under high biomass concentration with complete biomass recovery and moderate energy consumption observed.
Harvesting of Scenedesmus obliquus cultivated in seawater using electro-flotation
신희원,김교찬,정주영,배성철,장용근,한종인 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
Seawater, when supplemented to a growth medium, appears to stimulate auto-flocculation of a certain microalgae species like Scenedesmus obliquus and thus renders its harvesting easy. To make use of this unique response for the purpose of biomass harvesting, S. obliquus was grown in a seawater-added medium and then collected in electrochemically- mediated ways. Significantly higher harvesting efficiency and energy saving were observed with electroflotation (EF) than with electro-coagulation-flotation (ECF) and the standard BG11 medium. An optimal EF condition, the highest recovery rate with least energy use, was found with a supply of 0.5 A. Seawater amendment was most beneficial in a level of 10%. All this clearly showed that applying EF to cells cultivated in the seawater-supplemented medium is a promising harvesting means that enables one to obtain algae biomass without interfering with the downstream process of biodiesel production.
박수정,김교찬,한상일,김은정,최윤이 한국응용생명화학회 2017 Applied Biological Chemistry (Appl Biol Chem) Vol.60 No.2
Increasing demand for renewable energy has led to the production of biodiesel from microalgae. Microalgae have been regarded as one of the best feedstocks for biodiesel due to their high growth rate and lipid content as compared to other crops and plants. However, use of microalgae is still hindered by technical barriers and high processing costs. The economic viability and environmentally friendly aspects of biodiesel production will be significantly improved by co-producing value-added chemicals and extracting lipids directly from wet biomass without involvement of organic solvents, respectively. In this study, organic solvent-free lipid extraction from wet Aurantiochytrium sp. biomass was developed to co-produce biodiesel and value-added products such as docosahexaenoic acid. Organic solvent-free lipid extraction was performed by applying alkali and heat treatments to wet biomass. Key parameters for the extraction from Aurantiochytrium sp. were optimized to increase extraction yields. A ratio of 15 mg/mL of biomass to alkaline solution and an alkaline solution concentration of 1% w/w were determined to be the optimal conditions. Both heating temperature and treatment time were associated with positive effects on lipid recovery, up to a certain level. The maximum extraction yield (77.37% of total lipid) was obtained by heating at 150 C for 30 min. Additionally, microwaves were employed to the extraction system and could further reduce the reaction time. Our study could be expanded to other types of microalgal biomass and will aid in establishing a protocol for organic solvent-free lipid extraction directly from wet biomass.