Microalga, Acutodesmus obliquus KGE 30 as a potential candidate for CO2 mitigation and biodiesel production

Microalga, Acutodesmus obliquus KGE 30 as a potential candidate for CO2 mitigation and biodiesel production

2016

In this study, the effect of flue gas CO₂ on growth, lipid production, and fatty acid composition of a green microalga Acutodesmus obliquus KGE 30 was investigated. The highest growth rate (0.46 g L⁻¹ and μₘₐₓ = 1.09 day⁻¹), total inorganic carbon removal (95.9 mg L⁻¹), and lipid productivity (20.1 mg L⁻¹ day L⁻¹) was obtained at 14.1 % CO₂ after 4 days of cultivation. In a semicontinuous batch reactor, the highest biomass production (1.19 g L⁻¹) was achieved after 12 days with continuous injection of flue gas CO₂. Compared with synthetic CO₂, fatty acid methyl ester analysis showed that the amount of unsaturated fatty acid increased by 19.2 % with 14.1 % flue gas CO₂. The application of flue gas CO₂ improved biomass production and lipid productivity in A. obliquus. The current investigation demonstrated that the use of flue gas CO₂ could reduce the cost of microalgae biomass production for better biofuel generation.

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