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Laboratory Study of Successive Soil Saline Leaching and Electrochemical Lead Recovery.

Djedidi, Zied; Drogui, Patrick; Ben Cheikh, Ridha; Mercier, Guy; Blais, Jean-François (2005). Laboratory Study of Successive Soil Saline Leaching and Electrochemical Lead Recovery. Journal of Environmental Engineering , vol. 131 , nº 2. p. 305-314. DOI: 10.1061/(ASCE)0733-9372(2005)131:2(305).

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Résumé

This research is related to a laboratory study on the performance of a successive soil saline leaching and electrochemical lead recovery process for soil decontamination. Erlenmeyer leaching assays showed that the addition of 5.5 mol NaCl/L in 25% (w/w) of soil pulp density maintained at pH 3.0 was found the most effective condition for Pb leaching. Under these conditions, 65% of Pb was leached from soil. Electrochemical treatment using an iron-monopolar electrode system operated at a current intensity of 3.0 A was able to reduce Pb content in soil leachate from 650 to 0.15 mg/L and this without production of metallic residue. Then, a leaching tank reactor and electrolytic cell coupled in a closed loop showed that the Pb mass balance of extrants/intrants ratio indicated 99.0±1.6% of Pb was recovered. Likewise, 94.1% of chloride ions were reused in the leaching tank reactor after electrochemical treatment.

Type de document: Article
Mots-clés libres: soil properties; electrokinetics; soil treatment; lead (chemical); leaching; chemical treatment; laboratory tests; salinity
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 19:26
Dernière modification: 08 janv. 2021 19:26
URI: http://espace.inrs.ca/id/eprint/11009

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