Burkina Faso is a Sahelian country that naturally faces water resource problems. Wastewater management is a major concern in large cities. The objective of this study was to evaluate the purification quality of the physicochemical and microbiological parameters of wastewater from the Kossodo wastewater treatment plant (WWTP). A total of twenty wastewater samples were taken at the inlet and outlet of the WWTP for analysis. These samples were subjected to physicochemical and microbiological analyses using standard methods. The purification efficiencies for thermotolerant coliforms, Escherichia coli, fecal streptococci, Salmonella, coliphages, and Pseudomonas were 99.43%, 57.86%, 86.65%, 99.65%, 96.06%, and 90.42%, respectively. The purification yields for parameters such as pH, TSS (Total Suspended Solids), COD (Chemical Oxygen Demand), and BOD (Biological Oxygen Demand) were 18%, 4.59%, 46%, and 14%, respectively. However, an increase in the load of PO43 NH4+, SO42- et NO3- was observed. The sanitary quality of all samples at the outlet was unsatisfactory. The microbiological parameters show good reduction, but the microbial loads at the outlet do not comply with the standards for treated wastewater discharges. However, physicochemical parameters comply with Burkinabe standards for wastewater discharges. This work could contribute to better decision-making on the control and optimization of the treatments carried out.
