WSEAS Transactions on Systems and Control
Print ISSN: 1991-8763, E-ISSN: 2224-2856
Volume 10, 2015
Exponential Regulation of Alkalinity and VFA in Continuous Anaerobic Digestion Processes under Uncertain Operational Conditions
Authors: , , , , ,
Abstract: In this paper we propose a multivariable robust feedback control for regulating the alkalinity and the volatile fatty acid concentration in continuous anaerobic digestion processes used in wastewater treatment. The system exhibits a large lack of knowledge on kinetic parameters. Furthermore, key state variables, which cannot be measured, are estimated by using a Luemberger observer. Thus, even under this highly uncertain scenario, the proposed control law uses this partial information for regulating exponentially the control variables. The control objectives are firstly established upon physicochemical criteria based on normal operational conditions and then formally stated in terms of the concerned state variables. The resulting control law is tested experimentally in a 1 m3 pilot plant for the treatment of red wine vinasses under several uncertain situations in which the multivariable control law is able to recover the system stability around the pre-specified set points showing a very high performance and usefulness for this kind of processes.
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Keywords: Alkalinity, Anaerobic Digestion, Interval Observers, Robust Regulation, Wastewater Treatment, Stability
Pages: 453-460
WSEAS Transactions on Systems and Control, ISSN / E-ISSN: 1991-8763 / 2224-2856, Volume 10, 2015, Art. #49