Main content area

Microalgae growth kinetic model based on the PSII quantum yield and its utilization in the operational curves construction

Undurraga, Daniel, Poirrier, Paola, Chamy, Rolando
Algal research 2016 v.17 pp. 330-340
Scenedesmus obliquus, air, carbon dioxide, kinetics, light intensity, microalgae, models, photobioreactors, photosystem II
In this study, a microalgae growth kinetic model based on its PSII quantum yield was built. It was used to simulate the following operational curves: microalgae concentration – dilution rate (X-D) and volumetric cell productivity – dilution rate (Q-D) in a continuous culture. The model considers 8 parameters particular for the microalgae species and its condition and 2 operational parameters (irradiance and flat plate photo-bioreactor (FPB) light path). The model was tested in a Scenedesmus obliquus continuous culture in FPB at a constant irradiance of 300μmol·m−2s−1 and a dilution rate range of (0.16 to 2.7d−1), with CO2-enriched air at 2%. The microalgae kinetic parameters were determined independently by means of simple methodologies, which were used to simulate the X-D and Qx-D operational curves. A very good correlation with the experimental results was found (correlation coefficient of 0.993 for the X-D curve). The optimal operating point to maximize the experimentally determined cell volumetric productivity was D=0.84d−1, while the model determined a value of D=1d−1.