title: Stabilization of unstable steady states of a continuous stirred tank bioreactor with predator-prey kinetics.
abstract: Nonlinear properties of a bioreactor with a developed microbiological predator-prey food chain are discussed. The presence of the predator microorganism completely changes the position and stability of the stationary states. A wide range of unstable steady states appears, associated with high amplitude oscillations of the state variables. Without automatic control such a system can only operate in transient states, with the yield undergoing periodic changes following the dynamics of the stable limit cycle. Technologically, this is undesirable. It has been shown that the oscillations can be removed by employing continuous P or PI controllers. Moreover, with a PI-controller, the predator can be eliminated from the system.
authors.affiliation: Cracow University of Technology, Institute of Chemical and Process Engineering, 31-155 Kraków, Poland.
authors.forename: Bolesław
authors.initials: B
authors.lastname: Tabiś
authors.forename: Szymon
authors.initials: S
authors.lastname: Skoneczny
mesh_terms: D001331:Automation; D019149:Bioreactors / Q000382:microbiology* / Q000592:standards; D020387:Food Chain; D007218:Industrial Microbiology / Q000379:methods*; D007700:Kinetics; D011786:Quality Control; D013816:Thermodynamics
keywords: Biodegradation; Control system; Microbiological reactor; Nonlinear oscillation; Predator–prey kinetics