Resumo

BARAJAS SOLANO, Andrés Fernando et al. Improvement of CO₂ sequestration by Chlorella vulgaris UTEX 1803 on labscale photobioreactors. Rev. ion [online]. 2012, vol.25, n.2, pp.39-47. ISSN 0120-100X.

Microalgae have been suggested as an appropriate response to the production of fuels due to their advantages associated with high growth rates, high photosynthetic efficiency and high production of biomass compared to other terrestrial energy crops. This work focuses on the effect of continuous inyection of CO₂ on biomass productivity of Chlorella vulgaris UTEX 1803 on labscale photobioreactors. Autotrophic cultures were carried out on 23±1°C, with light:dark cicles of 12:12, also different fluxes of CO₂ (2.3 and 3.8 v%) and different concentrations of sodium nitrate (0.59mM; 1.18mM; 1.76mM; 2,35mM) were tested. Results obtained in the different experiments show that the best productivity were 0.28 (g/l.dia) and 0.44(g/l.dia) using 2.3v% de CO₂, 0.59mM NaNO₃ and 3.8v% de CO₂, 1.18mM NaNO₃ respectively, Indicating that the amount of CO₂ influence generates the greatest influence on the growth of C. vulgaris. However, by lowering the concentration of nitrogen, it is possible to obtain a higher productivity of biomass. This represents an important advance in photosynthetic crop production, as it opens the possibilities to improve the total biomass production while reducing costs production.

Palavras-chave : microalgae; Chlorella vulgaris; autotrophic cultures; carbon dioxide; photobioreactors.

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