Effect of flue gas CO2 on the growth, carbohydrate and fatty acid composition of a green microalga Scenedesmus obliquus for biofuel production

Abstract

Effect of various flue gas CO2 concentrations (5%, 10% and 14.1%) on growth rate and biochemical properties of a green microalga Scenedesmus obliquus was investigated. S. obliquus showed the highest biomass production and growth rate (0.36&#8197

g&#8197

L&#8722

1 and μmax&#8201

=&#8201

1.00&#8197

day&#8722

1), total inorganic carbon removal (35.8&#8197

mg&#8197

1), lipid productivity (9.9&#8197

1&#8197

day) and carbohydrate productivity (10.3&#8197

day) with 14.1% CO2 after 8 days of cultivation. Fatty acid methyl ester analysis revealed that the palmitic and oleic acid contents were increased up to 5% and 7% with 14.1% CO2, respectively. Application of flue gas CO2 enhanced the growth along with lipid and carbohydrate productivity of S. obliquus, which can be exploited for reducing the CO2 concentration.