IMPACT OF URBAN DISCHARGES FROM THE TOWN OF ADZOPE ON THE MASSAN RIVER WATER RESERVOIR USED FOR THE PRODUCTION OF WATER FOR HUMAN CONSUMPTION (SOUTH-EAST OF COTE DIVOIRE)

The town of Adzope, in the southeast of Cote dIvoire is faced with a sanitation problem, the direct consequence of which is the untreated discharge of wastewater into the Massan River reservoir. The objective of this work is to carry out a physico-chemical characterization of urban wastewater in the town of Adzope. This characterization of urban wastewater is a good indicator of the quality of discharges and their impact on the receiving environment. The pH, temperature, electrical conductivity (EC) and dissolved oxygen (O2) were measured in situ using a multi-parameter HANNA HI 9829. In the laboratory, the various physico-chemical parameters were analysed according to the analysis methods recommended by the French Association for Standardization. The results obtained show that the parameters studied (T, pH, EC, DO, COD, DOB5, TSS, NH4, NO3, PO4 and Cl) have variable contents from one site to another. Most of the parameters studied comply with the discharge standards established by Ivorian legislation, except suspended particles and phosphate ions. These two parameters have values that exceed the established standards. Thus, the discharge of this wastewater into the Massan River reservoir can lead to eutrophication.