CEST2025

Cyanobacteria have the ability to photoautotrophic growth, optimizing it for viable biomass and lipid production. This study investigated the kinetic behavior of Arthrospira platensis by culturing it in two different substrates: synthetic zarrouk medium and anaerobic sludge. The four kinetic models studied were those of Webb-Edwards, Andrews, Camacho and Steele. The evaluation was carried out using experimental data to estimate basic kinetic parameters (μₘₐₓ, Ks, Ki) through nonlinear regression. The results showed significantly higher growth rates and lipid yields in the zarruk medium, which appear to be attributed to sufficient phosphate availability and low organic inhibition, while the anaerobic substrate yield was reduced probably due to toxicity and limited nutrients. The integration of kinetic modeling with physicochemical analysis provided a comprehensive understanding of the system behavior, highlighting the importance of substrate selection in the optimization of photobioreactor-based systems.