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Updated: Aug 8, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Extremum-seeking with variable gain control for intensifying biogas production in anaerobic fermentation
J Liu1, G Olsson, B Mattiasson
1Dept of Biotechnology, Lund University, PO Box 124, 221 00 Lund, Sweden. Jing.Liu@biotek.lu.se
Abstract:
A state-dependent variable-gain control system is implemented to follow the characteristics of a laboratory-scale up-flow anaerobic fixed-bed reactor dynamically. The transition from one state to another is determined on an hourly basis, depending on difference between the setpoint of the reactor pH and its true value. Considerable improvement of the process stability--reduction of oscillation in both the reactor pH and biogas production rate during high-rate operation, has been achieved, although the control structure is simple and intuitive.
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