Treatment and Reuse of Domestic Wastewater: The Case of Water from the Camp SIC of Cité Verte Wastewater Treatment Plant (Yaounde-Cameroon)

The crisis of access to water is becoming increasingly worrying, requiring the exploration of sustainable solutions. In this context, recycling and reuse of treated wastewater are emerging as promising alternatives. The aim of this study is to implement a tertiary treatment system at the Camp SIC Cité-Verte wastewater treatment plant in Yaoundé, Cameroon, to improve the quality of the treated wastewater so that it can be safely reused to flush toilets. The methodological approach adopted includes sampling treated wastewater followed by laboratory analysis, then the design and implementation of a tertiary treatment system. A survey is then carried out among a sample of the local population to gather their opinions on the project. Analyses of the treated wastewater revealed the presence of certain contaminants requiring additional treatment. Tests on a pilot prototype validated the system's effectiveness, with a turbidity reduction rate of 80.95% after coagulation-decantation and 90.48% after sand filtration, followed by an 88.88% reduction in suspended solids. In addition, total elimination of bacterial loads was achieved with a free chlorine level of 0.73 mg/L to prevent occasional contamination. This study highlights the project's significant potential to contribute to sustainable water management.