Абстрактный

Textural And Structural Evolution Of Clays From Three Potentials Sites For Acid Effluents Storage: Effect Of The Acid Attack

Noureddine HAMDI, Ezzeddine SRASRA

Within the framework of storage of a high acidic waste in geological sites, the argillaceous layer plays a very significant role to minimize the migration of pollutant towards the underground water. This paper presents the findings of an investigation on the structural and textural evolution after the permeability test of clays from the three potentials sites for acid effluents storage in the south of Tunisia (MK, H and ZB). The textural changes for the three varieties of clays obtained after lixiviat permeability test were studied through nitrogen gas adsorption at liquid nitrogen temperature, we determined the specific surface areas (SBET), total pore and micropore volume. The textural study data have indicated that the MK clay had a lowest textural properties with a pore volume in the 0.06-0.09 cm 3g-1 range and with a surface area (SBET) vary between 35.43 and 47.45 m2g-1. A detailed structural and morphologic modification were undertaken by scanning electron microscopy (SEM) equipped by an energy–dispersive spectroscopy (EDS), their results shows that MK and H clays able to fix the noxious elements. Therefore, only the clay of (MK) site presents a favourable textural and structural properties for storage of this waste.