Control effort reduction by optimizing the parameters of a PI control for dissolved oxygen concentration in an active sludge system

The biological treatment of industrial waste is a priority theme for the sustainable development of any society. In recent years, there has been a significant increase in the study of the efficiency of this process. This study aims to control the dissolved oxygen concentration through the agitator to degrade organic matter and total ammonia nitrogen within the established hydraulic residence time with less control effort. For that, two control schemes ware designed in Matlab, a conventional PI and a PI with parameters optimized regarding some conditions. In both cases, de degradation was succeed, but the second one achieve a lower control effort, 200 rpm less than the PI conventional and an early stabilization of the concentration of dissolved oxygen, about ten hours less.