Abstract
Much endeavor has been dispensed recently to evaluate the potential of CO2 mitigation by microalgae. We introduce an alternative, novel, LED-illumination isothermal microcalorimetric method to assess the thermodynamic behaviors of microalgae for better understanding of their carbon sequestration capacity. Microalgae thermodynamic behaviors were recorded as power-time curves, and their indices such as total heat evolution (QT), maximum power output (Pmax) and heat generated by per algae cell (JN/Q) were obtained. The values for highest (74.80gL-1) and control sample (0.00gL-1) of QT, Pmax and JN/Q were 20.85 and 2.32J; 252.17 and 57.67μW; 7.91 × -06 and 8.80 × -07Jcell-1, respectively. According to the values of QT, a general order to promote the CO2 sequestration was found at 74.8gL-1> 29.92gL-1> 14.96gL-1> 7.48gL-1> 0gL-1 of C sources, which directly corresponded to carbon availability in the growth medium. Chlorella vulgaris GIEC-179 showed the highest peak Pmax at 74.8gL-1 concentration which was directly transformed to their biomass during bio-fixation of CO2 process. This study is applicable for better understanding of CO2 fixation performance of algae.
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