EconPapers    
Economics at your fingertips  
 

Optimal Separation of Two Microbial Species Competing for Two Substitutable Resources

Walid Djema (), Térence Bayen () and Jean-Luc Gouzé ()
Additional contact information
Walid Djema: CNRS-Sorbonne Université (LOV), GreenOwl project-team
Térence Bayen: Avignon Université
Jean-Luc Gouzé: CNRS, Macbes project-team

Journal of Optimization Theory and Applications, 2025, vol. 205, issue 3, No 20, 32 pages

Abstract: Abstract We address a selection problem between two microbial species by controlling the dilution rate in a continuous stirred tank reactor. Unlike earlier studies, we focus on the competition between species for two substitutable substrates instead of a single limiting resource, with each species capable of dominating the culture. The selection of the most suitable strain is formulated as a minimum-time optimal control problem. After examining the reachability of the target set, we conduct a thorough analysis of optimal solutions and singular arcs, using Pontryagin’s Maximum Principle and geometric control theory. Notably, unlike studies involving a single substrate, the target is not always reachable, and we construct a counterexample to prove it. In the case where the target can be reached, we highlight that optimal solutions exhibit turnpike-like phenomena by combining the approach with a direct optimization method, and these properties differ from those in the single-substrate case. Although there is no natural static optimization problem associated with a minimum-time control problem, our analysis enables us to characterize the turnpike point as the solution to a static optimization problem associated with an auxiliary Lagrange-type optimal control problem. These results are extensively illustrated throughout this work using direct optimization.

Keywords: Pontryagin’s maximum principle; Singular arcs; Turnpike phenomenon; Chemostat system; Strain selection; Microbial competition; 49K15; 37N25; 92C75 (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://link.springer.com/10.1007/s10957-025-02672-x Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:joptap:v:205:y:2025:i:3:d:10.1007_s10957-025-02672-x

Ordering information: This journal article can be ordered from
http://www.springer. ... cs/journal/10957/PS2

DOI: 10.1007/s10957-025-02672-x

Access Statistics for this article

Journal of Optimization Theory and Applications is currently edited by Franco Giannessi and David G. Hull

More articles in Journal of Optimization Theory and Applications from Springer
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().

 
Page updated 2025-04-26
Handle: RePEc:spr:joptap:v:205:y:2025:i:3:d:10.1007_s10957-025-02672-x