What is the main purpose of a sewage treatment plant?

The main purpose of a sewage treatment plant is to conduct treatment processes that remove contaminants and pollutants from wastewater before it is released back into the environment or reintroduced for certain uses. This is crucial for protecting public health and the environment. The treatment typically involves multiple stages, including physical, biological, and chemical processes, aimed at reducing harmful substances such as pathogens, nutrients, and organic matter present in sewage.

By effectively treating sewage, these plants help prevent the spread of waterborne diseases, minimize environmental degradation, and improve water quality. The treated effluent may then be safely discharged into rivers, lakes, or oceans, or it may be reused for non-potable purposes, depending on local regulations and the quality of treatment achieved.