IMPACT DES REJETS URBAINS ET INDUSTRIELS SUR L'EAU SUPERFICIELLE ET SOUTERRAINE DANS LA PLAINE D’ANNABA (ALGERIE)

Abstract

Urban wastes in wadi of Meboudja, a tributary of the Seybouse raise the difficult question of their impact on surface and groundwater in conjunction with the plain of Annaba. In this research, several sampling campaigns at no monthly surface water of the river and groundwater on two witnesses in which a pump were conducted during the annual hydrological cycle. The comparison between the chemical composition of the river’s water and those of groundwater collected shows that, we observe the existence of two pollutants: phosphate and ammonium, for against, at the water there is only the phosphate ions that have been moving in the same chemical form between the river and the two wells. The decrease in the concentration of phosphate between river and catchments is due to the dilution effect by the groundwater levels, the precipitation of phosphate in the form of calcium phosphate and finally by the clays adsorption. Nonetheless, the absence of ammonium in the catchments is due to the change in the form of nitrate nitrogen during the journey between the two communities as a result of oxidizing conditions