Behaviour of chromium VI in a multilayer aquifer in the industrial zone of Annaba,Algeria |
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| Authors: | H Khérici-Bousnoubra N Khérici E F Derradji C Rousset R Caruba |
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| Institution: | (1) Geology Laboratory, Department of Geology, Faculty of Earth Sciences, University of Annaba, P.O. Box No. 12, El Hadjar, 23200, Algeria;(2) Chemical Environmental Laboratory, University of Provence, Aix-en-Provence, France;(3) Faculty of Sciences, Laboratory of Petrology-Mineralogy, Nice Cedex, France |
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| Abstract: | Industrial wastewater is characterised by the presence of a great quantity of metallic micro-pollutants, among which chromium
by its mobility, contaminates the surface and groundwater. The study of different aquifers within the area of Annaba (Algeria)
shows extremely variable chromium concentrations in the unconfined aquifer (0–0.22 mg l−1), which becomes practically null in dry period; on the other hand, they remain relatively constant in the deep confined aquifer
(about 0.04 mg l−1). To specify the mechanisms of chromium migration in the aquifer system, a study of space–time evolution of chromium concentrations
in unconfined aquifer was undertaken, while considering the kinetics of diffusion in the deeper aquifer. Chromium, indirectly
reduced microbiologically by sulphate-reducer bacteria in the upper aquifer, is likely to anticipate the auto-depuration capacity
of the ground and to reduce the quality of groundwater. |
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| Keywords: | Unconfined aquifer Confined aquifer Water pollution Chromium Annaba Algeria |
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