Acta Chimica Slovaca (ACS) publishes papers on fundamental and applied aspects of chemistry, biochemistry, chemical technology, chemical engineering and process control, biotechnology and food technology. Welcome are also topics which include chemical aspects of materials, physical chemistry and chemical physics, analytical chemistry, macromolecular chemistry and biomedical engineering.

Predictive control of a cascade of biochemical reactors

Martin Mojto *, Michaela Horváthová, Karol Kiš, Matúš Furka, Monika Bakošová

Slovak University of Technology in Bratislava, Faculty of Chemical and Food Technology, Institute of Information, Engineering, Automation, and Mathematics, Radlinského 9, 812 37 Bratislava, Slovak Republic

E-mail: *

Abstract: Rapid growth of the human population has led to various problems, such as massive overload of wastewater treatment plants. Therefore, optimal control of these plants is a relevant subject. This contribution analyses control of a cascade of ten biochemical reactors using simulation results with the aim to design optimal and predictive control strategies and to compare the achieved control performance. The plant represents a complicated process with many variables involved in the model structure, reduced to the single-input and single-output system. The first implemented approach is linear offset-free model predictive control which provides the optimal input trajectory minimising a quadratic cost function. The second control strategy is robust model predictive control with similar features as model predictive control but including the uncertainty of the process. The final approach is generalised predictive control, mostly used in the industry because of its simple structure and sufficiently good control performance. All considered predictive controllers provide satisfactory control performance and remove the steady-state control error despite the constrained control inputs.

Keywords: biochemical reactor, generalised predictive control, model predictive control, robust model predictive control, wastewater treatment

Acta Chimica Slovaca, Vol. 14, No. 1, 2021, pp. 51—59, DOI: 10.2478/acs-2021-0007