APPLICATION OF H-INFINITY CONTROL TO AN ACTIVATED-SLUDGE PROCESS

This paper presents an application of the Robust Control Theory, concr etely the H-infinity approach, to the control of the activated sludge process with the aim of proving the feasibility of these types of tech niques to the control of biotechnological processes. A generic non-lin ear model of the process is considered. The design of the H-infinity c ontroller is carried out based on a linearization of such a model arou nd prescribed operating conditions. In order to evaluate the performan ce of the design, simulation calculations with input profiles taken fr om experimental data have been made. The results show the effectivenes s of the H-infinity design.