Optimization of the separation of two species in a chemostat

Térence Bayen (1, 2) , Francis Mairet (3)

1 MODEMIC - Modelling and Optimisation of the Dynamics of Ecosystems with MICro-organisme
2 I3M - Institut de Mathématiques et de Modélisation de Montpellier
3 BIOCORE - Biological control of artificial ecosystems

In this work, we study a two species chemostat model with one limiting substrate, and our aim is to optimize the selection of the species of interest. More precisely, the objective is to find an optimal feeding strategy in order to reach in minimal time a target where the concentration of the first species is significantly larger than the concentration of the other one. Thanks to Pontryagin maximum principle, we introduce a singular feeding strategy which allows to reach the target, and we prove that the feedback control provided by this strategy is optimal whenever initial conditions are chosen in the invariant attractive manifold of the system. The optimal synthesis of the problem in presence of more than one singular arc and for initial conditions outside this set is also investigated.

Mots clés: Optimal control; Pontryagin maximum principle; Chemostat

Domaines: Optimisation et contrôle [math.OC]

Térence Bayen, Francis Mairet. Optimization of the separation of two species in a chemostat. Automatica, 2014, 50 (4), pp.1243-1248. ⟨10.1016/j.automatica.2014.02.024⟩. ⟨hal-00817147v2⟩