Maximizing microalgae productivity in a light-limited chemostat

Type Article
Date 2018
Language English
Author(s) Martinez Carlos1, 2, 4, Bernard Olivier1, 2, 4, Mairet FrancisORCID1, 3, 4
Affiliation(s) 1 : UPMC Univ Paris 06, INRIA, INRA, Univ Cote Azur,BIOCORE Team,CNRS, Paris, France.
2 : LOV UPMC Sorbonne CNRS, UMR 7093, Stn Zool, BP 28, F-06234 Villefranche Sur Mer, France.
3 : IFREMER PBA, Nantes, France.
4 : INRIA Sophia Antipolis, 2004 Route Lucioles BP 93, F-06902 Sophia Antipolis, France.
Source Ifac Papersonline (2405-8963) (Elsevier Science Bv), 2018 , Vol. 51 , N. 2 , P. 735-740
DOI 10.1016/j.ifacol.2018.04.001
WOS© Times Cited 7
Keyword(s) Dynamics and control, Industrial biotechnology, Photoinhibition, Biomass productivity, Microalgae, Photoacclimation, Chlorophyll

Light supply is one of the most important parameters to be considered for enhancing microalgae growth in photobioreactors (PBR) with artificial light. However, most of the mathematical works do not consider incident light as a parameter to be optimized. In this work based on a simple model of light-limited growth, we determine optimal values for the dilution rate and the incident light intensity in order to maximize the steady-state microalgal surface productivity in a continuous culture. We also show that in optimal conditions there is a minimal initial microalgal concentration (and we give a simple expression to determine it) to guarantee the persistence of the population. Finally, in the context of enhancing microalgae productivity by reducing light absorption by microalgae, we conclude our work by studying the influence of the chlorophyll-carbon quota on the maximal productivity.

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