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STUDY OF THE IMPACT OF INDUSTRIAL DISCHARGES ON SURFACE WATER AND GROUNDWATER IN THE AREA OF ANNABA.

The characterization of a hydrologically complex contaminated site bordering the Meboudja river (Annaba, Algeria) was undertaken by investigating surface water and groundwater affected by Number of industrial rejections have been established during 1999-2009 in the El-Hadjar Industrial Development Area in the Annaba region, North-East of Algeria. The treated and untreated effluents from the industries are being discharged in Meboudja wadi. Groundwater level and water quality monitoring was carried out during 1999 and 2009 in El-Hadjar and its environs. Surface water samples were also analyzed for the water quality. The groundwater shows a high electric conductivity (more than 1000 cm-1 with a maximum exceeding 6000 µScm-1), a high chloride content (with a maximum exceeding 1400 mgl-1), and a high sodium concentration (maximum = 730 mgl-1) are observed for the wells located down gradient and near the industrial rejections. Also, high iron and manganese concentrations are observed in these wells. The Meboudja is acting as a diffuse source of contaminations all along its course. Aquifer parameters were estimated by carrying out pumpings test at a number of wells. Groundwater flow and mass transport models were prepared using visual MODFLOW software. The extent of migration of contaminants from the Meboudja and other streams has been assessed for 11 years (1999-2009). The stream-aquifer interaction was found to be responsible for faster migration of contaminants in the over-exploited area east of the Seybouse.