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Evaluation of Arsenic Leaching Potential in Gold Mine Tailings Amended with Peat and Mine Drainage Treatment Sludge

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Rakotonimaro, T. V., Guittonny, Marie, Neculita, Carmen Mihaela, Trépanier, F. et Pépin, G. (2019). Evaluation of Arsenic Leaching Potential in Gold Mine Tailings Amended with Peat and Mine Drainage Treatment Sludge. Journal of Environmental Quality , 48 (3). p. 735-745. doi:10.2134/jeq2018.11.0392 Repéré dans Depositum à https://depositum.uqat.ca/id/eprint/1034

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Résumé

Peat and mine drainage treatment sludge can be valorized as amendments on mine sites to stabilize gold mine tailings and reduce the potential leaching of contaminants in pore water. However, the influence of organic amendments on the mobility of metalloids and/or metals in the tailings must be validated, as the leached contaminants may vary according to their type, nature, and origin. The objective of the present study was to evaluate over time the effect of peat- and/or Fe-rich sludge amendments on the mobility of As and metallic cations in the drainage water of tailings potentially producing contaminated neutral drainage. Ten duplicated weathering cell experiments containing tailings alone or amended with peat and/or Fe-rich sludge (5-10% dry weight) were performed and monitored for 112 d. The results showed that as low as 5% peat amendment would promote As mobility in tailings' pore water, with As concentrations exceeding Quebec discharge criteria (>0.2 mg L). In addition, As(III), the most mobile and toxic form, was predominant with 10% peat, whereas organic species were negligible in all cells. The use of peat alone as organic amendment for the stabilization of tailing contaminants could increase the risk of generating As-rich contaminated neutral drainage. Conversely, the mix of only 5% Fe-rich sludge with or without peat decreased As concentrations in leachates by 65 to 80%. Further studies on the use of "peat" or "peat + Fe-rich sludge" as cover or amendment should be conducted with a focus on Fe/As and Ca/As ratios.

Type de document: Article
Informations complémentaires: Licence d'utilisation : CC-BY-NC-ND 4.0
Mots-clés libres: Arsenic; Arsenate; Ferric arsenate; Peat; Mine drainage; Gold mines; Mine tailings; Sludge; Leaching
Divisions: Génie
Mines et eaux souterraines
Date de dépôt: 21 avr. 2020 17:50
Dernière modification: 04 juin 2020 19:35
URI: https://depositum.uqat.ca/id/eprint/1034

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