Wastewater treatment is a process used to remove contaminants from wastewater or sewage and convert it into effluent that can be returned to the water cycle with acceptable impact on the environment, or reused for various purposes (called water reclamation). The treatment process takes place in a wastewater treatment plant (WWTP), also referred to as a Water Resource Recovery Facility (WRRF) or a Sewage Treatment Plant (STP) in the case of domestic wastewater. Pollutants in wastewater are removed, converted, or broken down during the treatment process. Wastewater is any water that has been contaminated by human use. The wastewater is then used water from any combination of domestic, industrial, commercial, or agricultural activities, surface runoff, or stormwater We planning a residential township for 10, 000 populations. In this township, we design a small wastewater treatment plant. In this treatment plant, we design to treat domestic wastewater. In the wastewater treatment plant, we design units of the wastewater treatment plants.