Tools for improving feeding strategies in a SBR with several species Article - 2014

Pedro Gajardo, Hector Ramirez Cabrera, Julio C. Rodriguez

Pedro Gajardo, Hector Ramirez Cabrera, Julio C. Rodriguez, « Tools for improving feeding strategies in a SBR with several species  », Bioprocess and Biosystems Engineering, 2014, pp. 63 - 70. ISSN 1615-7591

Abstract

This paper analyzes feeding strategies in a sequential batch reactor (SBR) with the objective of reaching a given (low) substrate level as quickly as possible for a given volume of water. Inside the SBR, several species compete for a single substrate, which leads to a minimal time control problem in which the control variable is the feeding rate. Following [10], we allow the control variable to be a bounded measurable function of time combined with possible impulses associated with instantaneous dilutions. For this problem, the ex-tremal trajectories of the singular arc type are characterized as the strategies used to maintain the substrate at a constant level. Because this optimization problem is difficult to solve, this characterization provides a valuable tool for investigating the optimality of various feeding strategies. Our aim is thus to illustrate the use of this tool by proposing potential optimal feeding strate-gies, which may then be compared with other more intuitive strategies. This aim was accomplished via several numerical experiments in which two specific strategies are compared.

Voir la notice complète sur HAL

Actualités