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Updated: Jul 22, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Stability analysis of the biodegradation of mixed wastes in a continuous bioreactor with cell recycle
1Department of Chemical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia. aajbar@ksu.edu.sa
Abstract:
The stability characteristics of a continuous bioreactor with cell recycle for biodegradation of mixed wastes are investigated. The system involves a pure culture of Pseudomonas putida and media containing phenol and glucose as carbon and energy sources. The model growth kinetics for the two substitutable substrates were experimentally validated in a previous study. The stability analysis carried out using elementary principles of bifurcation theory shows rich dynamics characteristics of the reactor model, including steady-state multiplicity and hysteresis. The effect of the bioreactor operating parameters on the stability behavior of the model is discussed. Practical criteria are also derived for the safe operation of the unit and to prevent the occurrence of wash-out conditions.
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