Sewage treatment is the process of removing contaminants from wastewater, which is produced by households and industries. This process typically involves several stages, including physical, biological, and chemical treatments, to ensure that the water is safe to return to the environment or to be reused. The primary goal of sewage treatment is to reduce harmful substances, such as bacteria and nutrients, that can pollute water bodies like rivers and lakes. Facilities known as wastewater treatment plants are equipped with various technologies to achieve this, helping to protect public health and the ecosystem.