Kinetic modeling and optimization of carbon dioxide fixation using microalgae cultivated in oil-sands process water

Abstract Biological fixation of CO 2 using microalgae is an effective carbon dioxide capture technology. To make this option economically competitive compared to other CO 2 capture techniques, a better understanding of its dynamic behavior is required. In this study, data generated using a central composite experimental design (CCD) with varying light intensity, CO 2 and phosphate concentration was used to develop a mathematical model that describes the kinetics of algal growth and CO 2 , phosphate, nitrate and ammonium uptake rate of Chlorella kessleri cultivated in oil sands process water (OSPW). The model considers the uncoupling between nutrients uptake and growth and the possibility of luxurious uptake of nutrients. This nonlinear dynamic model was used to determine the optimal CO 2 concentration, phosphate concentration and light intensity for CO 2 uptake and algal growth over a period of time in a batch culture using a multi-objective optimization technique to maximize CO 2 fixation and algal growth simultaneously.

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