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Evaluation of a modified photobioreactor performance for bio-fixation of carbon dioxide by Chlorella vulgaris at different light intensities

The performance of a modified bioreactor inside a light enclosure for carbon dioxide (CO2) bio-fixation by Chlorella vulgaris was investigated. The influence of different light intensities on CO2 bio-fixation and biomass production rates was evaluated. The results showed that the photon flux available to microalgal cultures can be a key issue in properly optimizing microalgae photobioreactor performance, particularly at high cell concentrations. Although the optimal pH values for C. vulgaris range from 6-8, cell growth can take place even at pH 4 and 10. Batch microalgal cultivation in a photobioreactor was used to investigate the effect of different light intensities, including 30, 50, 100, 185 and 300 μmol m -2 s -1 . The maximum biomass concentration of 1.83 g L -1 was obtained at a light intensity of 100 μmol m -2 s -1 and 2 L min -1 of 2% CO2 enriched air aeration.