Design of a PID control system for a wastewater treatment plant

Abstract

This paper presents the design and control of a wastewater treatment plant with mechatronic systems. In this work, a control is developed for each level of treatment in order to optimize time and resources in construction. The development of the project shows that the application of a level sensor and a suction and exhaust pump is feasible in each of the treatment tanks. A heater was also added in the activated sludge treatment to increase the temperature and control the sludge faster. In addition, a reduction in the time for the system to stabilize can be visualized, including a PID control in all processes, managing not to cause overflows in the tanks and having a stable control. The optimal values obtained from the controller for the first system are 36, 0.00036, and 598450, for the second are 30, 0.02, 15 respectively. The implemented control will help to have a preventive and controlled maintenance of the entire system and avoid losses.