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Impact des décharges à ciel ouvert sur la qualité environnementale de l'Oued Cheliff (Algérie)

Abstract : In the region crossed by the largest permanent watercourse of Algeria Oued Cheliff, household waste is frequently put in open dumps, constituting a real environmental threat because of the contamination caused by the leachates. Two landfills were taken for the case study: the first located on Oued Hillil, a secondary tributary of Oued Chéliff and the second located on Oued Cheliff.Seasonal sampling of water and sediment has been conducted in streams. In the landfill, leachates and soils were also collected. The impact of landfills was assessed by analyzing physico-chemical parameters in liquids and metals in all compartments (water, leachate, soils and sediments). The analysis of fluorescent tracers in all compartments is used for monitoring urban pollution.This study has highlighted the important seasonal effect of the impact of landfills on rivers. In the spring, leachates present high levels of fluorescent tracers, Cr, Co, Mn, Ni from large deposits of green waste. In autumn, they reflected rather NO2-, SO42-, PO43-, Fe, Cu, Cr contamination from residues of agricultural products (fertilizer, phytosanitary treatments). The waters of both rivers are heavily loaded with Cl- and Sr in any season due to the saline nature of the soils of the region.The concentrations of metals in landfill soil are much higher than those of river sediments and reveal a high metallic contamination (Cd, As, Zn, Cr, Pb), reflecting the impact of urban waste (batteries, batteries, plastics ...)
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Ouiza Ould Ali. Impact des décharges à ciel ouvert sur la qualité environnementale de l'Oued Cheliff (Algérie). Autre. Université de Perpignan; Université Abdelhamid Ibn Badis (Mostaganem, Algérie), 2018. Français. ⟨NNT : 2018PERP0025⟩. ⟨tel-01954899⟩

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