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Open AccessArticle

Reuse of Dunite Mining Waste and Subproducts for the Stabilization of Metal(oid)s in Polluted Soils

1
INDUROT and Environmental Technology, Biotechnology and Geochemistry Group, Campus de Mieres, Universidad de Oviedo, 33600 Mieres, Asturias, Spain
2
Polytechnic School of Mieres, University of Oviedo, 33003 Oviedo, Asturias, Spain
3
Pasek Minerales, SAU. Mina Dunita Landoy, 15360 Cariño, A Coruña, Spain
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(8), 481; https://doi.org/10.3390/min9080481
Received: 16 July 2019 / Revised: 2 August 2019 / Accepted: 6 August 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Application of Mineral-Based Amendments)
The circular economy seeks to minimize the use of raw materials and waste generation. In this context, here we addressed the use of dunite mining tailings and subproducts to stabilize metal(oid)s in polluted soils. We first characterized the dunite mining tailings and subproducts, and a paradigmatic polluted soil in depth to determine their chemical and mineralogical properties. Experimental trials using Brassica juncea L. were performed to evaluate the impact of the two materials on vegetation growth, edaphic properties and pollutant stabilization yields. To this end, the plants were grown over 75 days in 1 kg pots containing the polluted soil amended with the dunite materials. Notably, both amendments caused a dramatic decrease in the available Zn and a moderate reduction in available Cu, Cd and Pb. In contrast, the concentration of available As was not modified. The cation exchange capacity (CEC) was improved by treatment with the amendments, allowing an increase in the biomass harvested. The immobilization mechanism achieved was probably due to an increase in pH and CEC. In conclusion, the dunite tailings and subproducts could be effective amendments for stabilizing polluted soil. This work paves the way for additional studies with distinct types of soils and conditions. View Full-Text
Keywords: dunite; soil; stabilization; metal(oid)s; mining dunite; soil; stabilization; metal(oid)s; mining
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MDPI and ACS Style

Baragaño, D.; Forján, R.; Menéndez Aguado, J.M.; Covián Martino, M.; Díaz García, P.; Martínez Rubio, J.; Álvarez Rueda, J.J.; R. Gallego, J.L. Reuse of Dunite Mining Waste and Subproducts for the Stabilization of Metal(oid)s in Polluted Soils. Minerals 2019, 9, 481.

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