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Feedback control design for an anaerobic digestion process

โœ Scribed by Jose Alvarez-Ramirez; Monica Meraz; Oscar Monroy; Alejandra Velasco

Publisher
Wiley (John Wiley & Sons)
Year
2002
Tongue
English
Weight
179 KB
Volume
77
Category
Article
ISSN
0268-2575

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โœฆ Synopsis

Abstract

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 stepโ€response models of the process endowed with an input delay to account for deadโ€times induced by measurement devices. The resulting feedback controller has a traditional proportionalโ€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.

ยฉ 2002 Society of Chemical Industry

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