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A Counter-Current Acid Leaching Process for the Remediation of Contaminated Soils from a Small-Arms Shooting Range.

Lafond, Stéphanie; Blais, Jean-François; Mercier, Guy; Martel, Richard (2014). A Counter-Current Acid Leaching Process for the Remediation of Contaminated Soils from a Small-Arms Shooting Range. Soil & Sediment Contamination , vol. 23 , nº 2. p. 194-210. DOI: 10.1080/15320383.2014.808171.

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Résumé

The objective of this research was to use a counter-current leaching process (CCLP) with leachate treatment to develop a remediation process for contaminated soils at a small-arms shooting range (SASR). The soil contaminant concentrations were 245mg Cu kg⁻¹, 3,368mg Pb kg⁻¹, 73mg Sb kg⁻¹, and 177mg Zn kg⁻¹. The CCLP includes three acid leaching steps (1M H₂SO₄ + 4M NaCl, t = 1h, T = 20°C, soil suspension = 100g L⁻¹), followed by one water rinsing step (1h). Seven counter-current remediation cycles were completed, and the average resulting metal removals were 93.2 ± 3.5% of Cu, 91.5 ± 5.7% of Pb, 82.2 ± 10.9% of Sb, and 30.0 ± 11.4% of Zn. The metal leaching performances decreased with the number of completed cycles. Soil treated with the CCLP with leachate treatment process met the USEPA threshold criteria of 5mg Pb L⁻¹ in the TCLP leachate. The CCLP allows a decrease of the water use by 32.9m³ t⁻¹ and the chemicals' consumption by approximately 2,650kg H₂SO₄, 6,014kg NaCl, and 1,150kg NaOH per ton of treated soil, in comparison to standard leaching processes. This corresponds to 78%, 69%, 83%, and 67% of reduction, respectively.

Type de document: Article
Mots-clés libres: contaminated soil; small-arms shooting range; acid leaching; counter-current; antimony; heavy metal
Centre: Centre Eau Terre Environnement
Date de dépôt: 10 avr. 2018 19:44
Dernière modification: 10 avr. 2018 19:44
URI: http://espace.inrs.ca/id/eprint/3610

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