Carbon dioxide fixation by microalgae cultivated in open bioreactors
2011
Rosa, Ana Priscila Centeno da | Carvalho, Lisiane Fernandes | Goldbeck, Luzia | Costa, Jorge Alberto Vieira
The biofixation of carbon dioxide (CO₂) by microalgae has been proven to be an efficient and economical method, mainly due to the photosynthetic ability of these microorganisms to use this gas as a source of nutrients for their development. The aim of this work was to study the growth of Spirulina LEB18 and Chlorella kessleri microalgae, exposed to controlled and non-controlled conditions, with the injection of different concentrations of CO₂. The cultures was carried out in 6 L open raceway ponds, under controlled conditions at 30°C and 39μEm⁻²s⁻¹ and under non-controlled conditions, protected by a tunnel of transparent film. The experiments were subjected to CO₂ injections at concentrations of 0.038, 6, 12 and 18% (v/v). The highest concentration of biomass (4.95gL⁻¹) and maximum daily fixation (0.21gg⁻¹d⁻¹) were obtained for Spirulina LEB18 in culture that was prepared in non-controlled conditions with an injection of 6% (v/v) of CO₂. C. kessleri had maximum (p<0.0008) specific growth rate (0.84d⁻¹) when grown with 18% (v/v) of CO₂ in non-controlled conditions of cultivation.
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