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In this research, the physiological response of the microalgae Spirulina platensis to salinity stress (1 and 100 g L) was investigated. Spirulina platensis and S. platensis (adapted to high salt concentration) were operated at laboratory scale in a semi-continuous photobioreactors. The responses examined were within 0.5 to 10% CO2 concentration, temperatures from 10 to 40 °C, light intensities from 60 to 200 μmol m s and presented better results in terms of all kinetic parameters. The highest rate of CO2 biofixation for S. platensis was 25.1 gCO2 m h, and the maximum specific growth (μmax) achieved was 0.44 d 0.67 d at 2.5% CO2, 150 μmol m s at 25 °C. Corresponding determined values of S. platensis adapted were 18.2 gCO2 m h, 0.31 d 0.58 d at 2.5% CO2, 60 μmol s m and 28 °C. However, both microalgae exhibited experimental limiting growth factors, CO2 10%, 40 °C and 200 μmol m s, conditions under which photosynthetic CO2 biofixation may be inhibited and photoinhibition of photosynthesis may be enhanced by salinity. The efficiency of 2.5% CO2 removal by S. platensis achieved 99%, whereas S. platensis adapted to 96%, respectively. The kinetic parameters estimated for S. platensis can be used to improve photobioreactor design for reducing of atmospheric carbon dioxide.

Impact of salinity on the kinetics of CO2 fixation by Spirulina platensis cultivated in semi-continuous photobioreactors