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Clays and Clay Minerals; April 2008; v. 56; no. 2; p. 259-271; DOI: 10.1346/CCMN.2008.0560209
© 2008 Clay Minerals Society
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INTERACTION OF AQUEOUS ACIDIC-FLUORIDE WASTE WITH NATURAL TUNISIAN SOIL

Noureddine Hamdi* and Ezzedine Srasra

Unité Matériaux, Technopole de Borj Cedria, Tunis, BP 95-2050 Hammam Lif, Tunisia

* E-mail address of corresponding author: hamdinoureddine{at}yahoo.fr

Clayey soils are essential materials used to reduce hydraulic conductivity and pollutant migration, common at sites of waste disposal. This study investigates the possible use of a Tunisian soil as a lining material for disposal sites for acidic-fluoride wastes. A permeability test on a waste-solution sample (pH = 2.7) obtained from a disposal site in southern Tunisia was conducted over a period of about 2 years. The test results show that the permeability decreased with time until stabilized at 8.33x10–11 m/s. After the permeability test, the samples retrieved from the permeameter show a degradation state which varied with the thickness of the specimen. These samples can be classified into three zones (Z1: unaffected, Z2: moderately affected; and Z3: extensively affected). Physicochemical characterization of the three samples (Z1, Z2, and Z3), and of the original argillaceous soil, was by X-ray diffraction, Fourier transform infrared spectroscopy, differential thermal and thermal gravimetric analysis, 29Si and 27Al nuclear magnetic resonance, and N2-adsorption techniques. The original sample consists essentially of palygorskite, kaolinite, and quartz. Sample Z3 underwent complete dissolution of kaolinite which supports the precipitation of fluoroaluminate and the appearance of an X-ray amorphous silica phase. In samples Z1 and Z2, the soil adsorbs fluoride at a rate of ~68.5 mg/g and is highly resistant to acidic attack.

Key Words: Acidic-fluoride Waste Storage • Clay • DTA-TG • FTIR • Permeability • 29Si and 27Al NMR • XRD






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