Sizing of a Wastewater Treatment System of the Center of Ngoundiane of the Alioune DiOP University of Bambey, Senegal

摘要

In our center where a lot of water is used for watering and cleaning the classrooms, the management of wastewater as a resource can be a real opportunity. The main objective of this research is to size and determine the effectiveness of natural treatments of the wastewater treatment system composed of a septic tank and a treatment plant which would be installed in site Ngoundiane of Alioune DiOP University, in Bambey, Senegal. Overall, we noted that the sized septic tank dimensioned in our study allows the efficient settling of wastewater which depends on the flow point ratio and useful settling surface area that must be lower than the upward speed that corresponds to 0.8 m/h. The sizing of the septic tank led us to obtain a useful capacity of 88 m~3 and a horizontal surface of 44 m~2 with a height of 2 m. The ratio between the flow of the wastewater received and the upward speed is 0.17 m/h and is significantly lower than the recommended speed. In addition, the station will be able to eliminate 80.418 of the Biochemical Oxygen Demand (BOD), 75.522 of the Chemical Oxygen Demand (COD), 92.385 of Suspended Solid (SS) and 43.427 of Nitrogen compounds.