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Pilot-Scale Decontamination of Small-Arms Shooting Range Soil Polluted with Copper, Lead, Antimony, and Zinc by Acid and Saline Leaching.

Guemiza, Karima; Mercier, Guy; Blais, Jean-François (2015). Pilot-Scale Decontamination of Small-Arms Shooting Range Soil Polluted with Copper, Lead, Antimony, and Zinc by Acid and Saline Leaching. Journal of Environmental Engineering , vol. 141 , nº 1. 04014054. DOI: 10.1061/(ASCE)EE.1943-7870.0000887.

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Résumé

The objective of this study was to evaluate at the pilot scale the performance of a chemical leaching process for Pb, Cu, Sb, and Zn removal from a fine fraction (<125∈∈μm) of soil at two Canadian small-arms shooting ranges (SASR; Batoche: 418∈mg∈Cu/kg, 5,006∈mg∈Pb/kg, 168∈mg∈Sb/kg, and 96∈mg∈Zn/kg; Normandie: 1,015∈mg∈Cu/kg, 6,024∈mg∈Pb/kg, 305∈mg∈Sb/kg, and 177∈mg∈Zn/kg). A comparison of different leaching reagents revealed that the use of H₂SO₄ (0.125M)+NaCl (4 M) is a very promising option from an economic point of view to solubilize metallic pollutants from highly polluted soils. The results showed that chemical treatment, including three successive acid-leaching steps (0.125MH₂SO₄+4MNaCl, PD=10%, t=1h, T=20°C) followed by one rinsing step using water [pulp density (PD)=10%, time (t)=15∈∈min, temperature (T)=20°C], resulted in metal removal yields of 93% Cu, 97% Pb, 89% Sb, and 70% Zn in Batoche soil and 85% Cu, 96% Pb, 59% Sb, and 49% Zn in Normandie soil. Subsequently, Sb and other dissolved metals (Cu, Pb, and Zn) were successfully recovered via chemical precipitation/coprecipitation (99.1% Cu, >99.9% Pb, 95.1% Sb, and 99.9% Zn - Batoche; 90.4% Cu, >99.7% Pb, 79.1% Sb, and >99.9%Zn - Normandie) by adding NaOH until pH=9.

Type de document: Article
Mots-clés libres: acid leaching; antimony; copper; lead; metal; saline leaching; small-arms firing range soil; zinc
Centre: Centre Eau Terre Environnement
Date de dépôt: 20 avr. 2018 20:15
Dernière modification: 20 avr. 2018 20:15
URI: http://espace.inrs.ca/id/eprint/3856

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