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Feedback control design for an anaerobic digestion process
Author(s) -
AlvarezRamirez Jose,
Meraz Monica,
Monroy Oscar,
Velasco Alejandra
Publication year - 2002
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.609
Subject(s) - robustness (evolution) , control theory (sociology) , anaerobic digestion , effluent , feedback control , pid controller , dilution , process control , process (computing) , computer science , feedback controller , control engineering , process engineering , chemistry , control (management) , engineering , temperature control , environmental engineering , biochemistry , physics , organic chemistry , methane , artificial intelligence , gene , operating system , thermodynamics
An approach for the design of linear feedback controllers for anaerobic digestion systems is presented. The effluent chemical oxigen demand (COD) concentration and the dilution rate are taken respectively as the regulated and the manipulated variables. The control design is based on simple step‐response models of the process endowed with an input delay to account for dead‐times induced by measurement devices. The resulting feedback controller has a traditional proportional‐integral (PI) control structure, so it can be easily implemented with conventional control technologies. Since the concentration of volatile fatty acids can be easily and quickly measured as compared with COD concentration, it is used as a secondary measurement that is incorporated into the feedback loop scheme to enhance the robustness of the control scheme with respect of influent disturbances. The performance of the proposed control scheme is illustrated via numerical simulations and experimental work. © 2002 Society of Chemical Industry