BOUNABI SANAEBOUAFIA WIAM2026-11-022026-06-28https://dspace.univ-bba.dz/handle/123456789/1806This dissertation deals with the automation of a wastewater treatment plant using a Siemens S7-300 Programmable Logic Controller (PLC). The main objective is to ensure the control and supervision of the different stages of wastewater treatment in order to improve the efficiency and reliability of the process. The control program was developed using TIA Portal and the Ladder Diagram (LAD) programming language. In addition, a Human-Machine Interface (HMI) was designed to monitor and control the process in real time. The results obtained demonstrate the importance of industrial automation in enhancing the performance and reliability of wastewater treatment plants.enWastewater Treatment PlantAutomationSiemens S7-300TIA PortalLadder DiagramHMIMonitoring and Control.Thesis