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 (0.8g cells/L·d) and FAME (fatty acid methyl esters) productivity (121mg/L·d) were achieved in the mixotrophic mode with 5g/L glucose, 5mM nitrate, and a flow rate of 0.2vvm. By contrast, the photoautotrophic cultivation resulted in a lower biomass (0.45g cells/L·d) and a lower FAME productivity (60.2mg/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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