The design of an STP depends on the volume of waste generated by the population served, the type of waste produced, and the local regulations governing the discharge of effluents. The Sewage Treatment Plant (STP) is a wastewater treatment plant that treats sewage and other wastes from homes, businesses, industries, hospitals, schools, etc. The STP receives raw sewage from the sewer mains. It then processes it to remove pollutants such as bacteria, viruses, heavy metals, oil and grease, organic matter, nitrogen, phosphorus, suspended solids, and dissolved oxygen. The treated water can be discharged into rivers or lakes or used for irrigation, industrial, or household use. The design of an STP depends on the volume of waste generated by the population served, the type of waste produced, and the local regulations governing the discharge of effluents.