Computer simulation of control strategies for optimal anaerobic digestion.

Sten Strömberg, M O Possfelt, Jing Liu

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Three previously published control strategies for anaerobic digestion were implemented in Simulink/Matlab using Anaerobic Digestion Model No. 1 (ADM1) to model the biological process. The controllers' performance were then simulated and evaluated based on their responses from five different types of process scenarios i.e. start-up and steady state performance as well as disturbances from concentration, pH and ammonia in the inflow. Of the three evaluated control strategies, the extremum-seeking variable gain controller gave the best overall performance. However, a proportional feedback controller based on the pH-level, used as a reference case in the evaluation, proved to give as good results as the extremum-seeking variable gain controller but with a lower wear on the pump. It was therefore concluded that a fast proportional control of the reactor pH is a key element for optimally controlling a low-buffering anaerobic digestion process.
    Original languageEnglish
    Pages (from-to)594-603
    JournalWater Science and Technology
    Volume67
    Issue number3
    DOIs
    Publication statusPublished - 2013

    Subject classification (UKÄ)

    • Industrial Biotechnology

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