ISSN : 2663-2187

Impact reduction of heavy metals present in leachate dischargesby stabilization-solidification using Portland cement and sodium silicates

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Hakmi Abdellatif, Abdelaziz Bendraoua, Rachid Lamari, Hadjadj Mohamed Laid, Belfar Mohamed Lakhdar, Nedjimi Mohammed Said
» doi: 10.48047/AFJBS.6.10.2024.7408-7427

Abstract

The purpose of this study was to explore a clean and effective method toremediate the environmental risks of the Fe, Cd,Ni, Hg, Cr, Pband Znin ALZINC leachate discharges(Ghazaouet, west of Algeria).The process consists of a stabilization / solidification (S/S) treatment of these sludge using hydraulic binders, followed by hardening and compacting in order to limit the solubility and the mobility of the pollutants.Then the leachate discharges samples were kneaded with aPortland cement and sodium silicates (Na2SiO3). These processes were tested on autumn and winter and evaluated during 95 days of S/Sfor each sample. Characterization of the leachate discharges samples were studied by scanning electron microscopy, energy disperse spectroscopy, Fourier transformed infrared spectroscopy, and X-ray diffraction. The determination of elements wasby Inductively Coupled Plasma-Atomic Emission Spectrometry, Cold Vapor-Atomic Absorption Spectrophotometry, and Atomic Absorption Spectrophotometry. The findings indicated significant stabilization of Cd, Ni, Zn, Pb, Hg, and Fe, with reductions exceeding 70%. Although the reduction ratio for Cr was comparatively lower, it remained within permissible limits, adhering to environmentalregulations. which is an indicative of the potential S/S processes of sludge token from the leachate discharges.

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