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ASSESSMENT OF HEAVY METALS LEACHING FROM DIFFERENT TYPES OF WASTE MIXED WITH MOLASSES
Abstract
In the present study it was evaluated the capacity of molasses for removing seven metals (Fe, Zn, Cu, Cd, Cr, Pb, and Ni) from three types of waste: galvanic sludge (pH = 7.1 пїЅ 7.8), mineral residue from a lead metallurgical plant (pH = 5.0 пїЅ 5.8) from Baia Mare (Romania), and tailing pond residue from Aurul - Baia Mare (pH = 2.1 пїЅ 3.0). Several leaching tests were conducted in the laboratory in order to investigate the influence of molasses concentrations (0 %, 1%, 5%, 10%) on heavy metal leaching. It was observed that the heavy metal concentration in the leachate followed the sequence Fe > Cu > Ni > Pb > Zn > Cd > Cr, and the metals concentration increased with molasses concentration. The results showed that the sugar acids from molasses can be used as possible effective agents for the remediation of heavy metals contaminated residues.
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