Title : Impacts of industrial discharges from FERTIAL on the water quality of Oued Seybouse (North East Algeria)

Aquatic environments present very varied vulnerabilities depending on the uses and hydrodynamic conditions. The contribution of effluents to the aquatic environment can profoundly modify the physicochemical composition of the receiving environment. These modifications are strongly linked to the hydrological regime of rivers. In order to limit the load and the concentrations of contaminants in the receiving medium, several methods have been developed. It is in this context that the present study falls, which concerns industrial discharges (FERTIAL-Annaba) in a natural receiving environment (Oued Seybouse, North East Algeria). The results of the physico-chemical analyzes carried out concern the main components of the pollution (T°, pH, EC, BOD5, NO-3, NO-2, NH+4, MES, OD and Cl-), show that surface of Oued Seybouse have chlorinated chemical properties and basic sprout. The BOD5 which reflects the biodegradability of the organic matter existing in this wadi, it is mainly local in most of the points analyzed. The other results obtained present concentrations which exceed the national standards of discharge. So we see that the waters of Oued Seybouse are very polluted and this pollution has several origins such as: industrial, chemical and also agro-food.