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Microalgae use photosynthesis as their principal metabolic mechanism to obtain organic carbon from the inorganic carbon contained in CO2 using solar energy. This process releases oxygen into the atmosphere. The aim of this study was to determine the most appropriate biomass concentration for growing Spirulina sp. LEB 18 (Cyanobacteria) in a vertical tubular photobioreactor with biomass removal and recycling of the medium to maximize CO2 biofixation. The maximum CO2 biofixation was obtained when the culture was maintained at 600 mg L-1 biomass concentration. Under this condition, the highest CO2 biofixation value was 186.8 ± 73.1 mg L-1 d-1, and the maximum productivity was 85.9 ± 6.0 mg L-1 d-1.       Key words: Biofixation, carbon dioxide, microalgae, recycling, tubular photobioreactor.

Carbon dioxide mitigation by microalga in a vertical tubular reactor with recycling of the culture medium