Mixotrophic cultivation of oleaginous Chlorella sp. KR-1 mediated by actual coal-fired flue gas for biodiesel production |
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Authors: | Ramasamy Praveenkumar Bohwa Kim Eunji Choi Kyubock Lee Sunja Cho Ju-Soo Hyun Ji-Yeon Park Young-Chul Lee Hyun Uk Lee Jin-Suk Lee You-Kwan Oh |
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Institution: | 1. Biomass and Waste Energy Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Republic of Korea 2. Department of Microbiology, School of Natural Science, Pusan National University, Busan, 609-735, Republic of Korea 3. Department of BioNano Technology, Gachon University, Seongnam, 461-701, Republic of Korea 4. Division of Materials Science, Korea Basic Science Institute (KBSI), Daejeon, 305-333, Republic of Korea
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Abstract: | Flue gases mainly consist of CO2 that can be utilized to facilitate microalgal culture for bioenergy production. In the present study, to evaluate the feasibility of the utilization of flue gas from a coal-burning power plant, an indigenous and high-CO2-tolerant oleaginous microalga, Chlorella sp. KR-1, was cultivated under mixotrophic conditions, and the results were evaluated. When the culture was mediated by flue gas, highest biomass (0.8 g cells/L·d) and FAME (fatty acid methyl esters) productivity (121 mg/L·d) were achieved in the mixotrophic mode with 5 g/L glucose, 5 mM nitrate, and a flow rate of 0.2 vvm. By contrast, the photoautotrophic cultivation resulted in a lower biomass (0.45 g cells/L·d) and a lower FAME productivity (60.2 mg/L·d). In general, the fatty acid profiles of Chlorella sp. KR-1 revealed meaningful contents (>40 % of saturated and mono-unsaturated fatty acids) under the mixotrophic condition, which enables the obtainment of a better quality of biodiesel than is possible under the autotrophic condition. Conclusively then, it was established that a microalgal culture mediated by flue gas can be improved by adoption of mixotrophic cultivation systems. |
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