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Traitement des eaux usées de tanneries à l'aide de matériaux à base d'argile

Abstract : In this work we propose to study methods of waste water processing, in particular those of a tannery of Mali (TAMALI), we investigate the immobilization of chromium, by using clay minerals.
We identified the compounds present in the effluents of the tannery of TAMALI: Cr, Fe, Mg, Mn, Ca, Si. We measured the total Cr and Cr(VI). We found a Cr concentration significant total (1,2 g/L) and very little dissolved Cr (VI) (0,035g/L). We detected organic acids.
We characterized a clay sample coming from Marakabassy MB: the diffraction of x-rays on rough clay and the fine fractions (2 µm) shows that the clay MB is composed of kaolinite, quartz with a small quantity of smectite and illite. The chemical analysis showed ratio SiO 2 / Al 2 O 3 higher than that of a kaolinite. MgO, Na 2 O, K 2 O and MnO indicate the presence beside the kaolinite of smectite and illite. ETM showed that clay is a kaolinite with fine particles lower than 0.1 µm and ESM showed fine particles of size lower than 100 nm beside well crystallized larger particles. The CEC and specific surface area confirmed these observations with values respectively 0.34 M eq. Kg -1 and 64 m 2 g -1.
Chromium (III) adsorption increases with the pH; 97% are adsorbed.
The adsorption of chromium (III) occurs well in the simple matrices (distilled water) but when one has complicated matrices it passes from 97% to less than 15%. Adsorption is obstructed by organic compounds. For that we made the adsorption of chromium in distilled water in the presence of organic compounds. It was seen that the weak concentrations do not have a significant effect on adsorption but from 5 mM one noted a fall of adsorption.
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Submitted on : Thursday, February 12, 2009 - 6:30:37 PM
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Drissa Samaké. Traitement des eaux usées de tanneries à l'aide de matériaux à base d'argile. Sciences de la Terre. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00360969⟩

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