Optimization of biomass productivity and carbon dioxide fixation ability by freshwater microalgae scenedesmus bajacalifornicus bbklp-07, a step towards sustainable development

Microalgae carbon dioxide (CO 2 ) sequestration has been recognized as a promising technology in the arena of sustainable development to mitigate CO 2 . The objective of the present study was to optimize the culture conditions for freshwater microalgae Scenedesmus bajacalifornicus BBKLP-07. Response surface methodology (RSM) was used to analyze biomass productivity (R1) and CO 2 fixation (R2) of microalgae Scenedesmus bajacalifornicus BBKLP-07 cultivated on media containing varying concentrations of CO 2 , nitrate and phosphate at different pH conditions. The predicted second-order quadratic model for response variables was significant (p < 0.01). Additionally, predicted R-squared values 0.7111 (R1), 0.8616 (R2) of quadratic model indicated the satisfactory fit of the model. On the basis of statistical analysis of results, CO 2 concentration (15%), sodium nitrate (1.75 g/l/day), Di potassium hydrogen phosphate (0.06 g/l/day) and pH 7 i.e. C 15 N 1.75 P 0 . 06 H 7 , was found to be the best combination for maximum biomass productivity (0.93 g/l/day) and highest carbon dioxide fixation rate (0.13 g/l/day).