The region of Dakar is characterized by a high population density often leading to a problem of development of the sewage network not equipped with a treatment station. The ejection of these raw untreated waters on the Dakar coast continually causes pollution of bays, seawater and threatens life in the aquatic environment and human health. The objective of this study is to assess the physicochemical quality of the wastewater discharged at the beaches of Hann, Mbao and Soumbédioune by the UV-visible spectrophotometry method. The physicochemical parameters show that the temperature varies between 21.7 and 34.8°C and the pH ranged from 6.73 to 7.93. Results are European standards for the water quality. However, the conductivity ranged from 1569 to 86500 (μS/cm) and exceeds the European standard. In addition, water results obtained show that the wastewater derived from the Dakar coast is rich in nitrites (2.3 mg/L) and phosphates (65 mg/L) which clearly exceed the standards established by the legislation, WHO (2017) reference guideline. Thus, it becomes important to establish sewage treatment plants in the study areas to improve the state of the coastal environment of the Dakar coast.
Key words: Dakar Coast, wastewater, physicochemical parameters, metals.
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