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Interaction of aqueous acidic-fluoride waste with natural tunisian soil

Published online by Cambridge University Press:  01 January 2024

Noureddine Hamdi  and
Ezzedine Srasra
Noureddine Hamdi*
Affiliation:
Unité Matériaux, Technopole de Borj Cedria, Tunis, BP 95-2050 Hammam Lif, Tunisia
Ezzedine Srasra
Affiliation:
Unité Matériaux, Technopole de Borj Cedria, Tunis, BP 95-2050 Hammam Lif, Tunisia
*
* E-mail address of corresponding author: [email protected]
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Abstract

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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 8.33 × 10−11 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.

Keywords

Acidic-fluoride Waste StorageClayDTA-TGFTIRPermeability29Si and 27Al NMRXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 56 , Issue 2 , April 2008 , pp. 259 - 271
Copyright
Copyright © 2008, The Clay Minerals Society

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