Wastewater treatment plants are facilities designed to clean used water from homes, industries, and businesses before it is released back into the environment. The process involves several stages, including screening, sedimentation, and biological treatment, which help remove harmful substances and pollutants. After treatment, the cleaned water can be safely discharged into rivers or lakes, or even reused for irrigation and industrial processes. These plants play a crucial role in protecting public health and the environment by ensuring that wastewater is properly managed and does not contaminate natural water sources.