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Separating Two Species of Microalgae in Photobioreactors in Minimal Time

Walid Djema 1, 2 Olivier Bernard 1, 2 Laetitia Giraldi 3, 2
1 BIOCORE - Biological control of artificial ecosystems
CRISAM - Inria Sophia Antipolis - Méditerranée , LOV - Laboratoire d'océanographie de Villefranche, INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
3 CALISTO - Stochastic Approaches for Complex Flows and Environment
CEMEF - Centre de Mise en Forme des Matériaux, CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : This paper proposes a strategy to separate two strains of microalgae in minimal time. The control is the dilution rate of the continuous photobioreactor. The microalgae dynamics is described by the Droop's model, taking into account the internal quota storage of the cells. Using Pontryagin's principle, we develop a dilution-based control strategy that leads to the most ecient species separation in minimal time. A numerical optimal synthesis based on direct methods is performed throughout the paper, in order to determine the structure of the optimal feedback-control law, which is bang-singular. Our numerical study reveals that singular arcs play a key role in the optimization problem since they allow the optimal solution to be close to an associated static optimal control problem. A resulting turnpike-like behavior, which characterizes the optimal solution, is highlighted throughout this work.
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https://hal.inria.fr/hal-03148717
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Submitted on : Monday, February 22, 2021 - 2:58:31 PM
Last modification on : Wednesday, February 24, 2021 - 3:08:12 AM

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Walid Djema, Olivier Bernard, Laetitia Giraldi. Separating Two Species of Microalgae in Photobioreactors in Minimal Time. Journal of Process Control, Elsevier, 2020, 87, pp.120-129. ⟨10.1016/j.jprocont.2020.01.003⟩. ⟨hal-03148717⟩

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