Article ID Journal Published Year Pages File Type
680413 Bioresource Technology 2014 6 Pages PDF
Abstract

•CO2-rich coal-fired flue gas could be effectively used for mixotrophic algal growth.•Fed-batch system with air supply in dark resulted in the highest lipid productivity.•Bacterial community of KR-1 depended markedly on organic feeding(s) and aeration.•Fatty acid composition of KR-1 meets the key biodiesel standards.

Industrial CO2-rich flue-gases, owing to their eco-toxicity, have yet to be practically exploited for microalgal biomass and lipid production. In this study, various autotrophic and mixotrophic culture modes for an oleaginous microalga, Chlorella sp. KR-1 were compared for the use in actual coal-fired flue-gas. Among the mixotrophic conditions tested, the fed-batch feedings of glucose and the supply of air in dark cycles showed the highest biomass (561 mg/L d) and fatty-acid methyl-ester (168 mg/L d) productivities. This growth condition also resulted in the maximal population of microalgae and the minimal population and types of KR-1-associated-bacterial species as confirmed by particle-volume-distribution and denaturing-gradient-gel-electrophoresis (DGGE) analyses. Furthermore, microalgal lipid produced was assessed, based on its fatty acid profile, to meet key biodiesel standards such as saponification, iodine, and cetane numbers.

Related Topics
Physical Sciences and Engineering Chemical Engineering Process Chemistry and Technology
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