Extremum-seeking with variable gain control for intensifying biogas production in anaerobic fermentation

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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.
Original languageEnglish
Pages (from-to)35-44
JournalWater Science and Technology
Volume53
Issue number4-5
DOIs
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Other Electrical Engineering, Electronic Engineering, Information Engineering
  • Industrial Biotechnology

Keywords

  • cascade control
  • anaerobic digestion
  • extremum-seeking
  • variable-gain
  • control

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