Microbial processes with the potential to mobilize As from a circumneutral-pH mixture of flotation and roaster tailings.

Autor: Pakostova E; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Canada. 150560@mail.muni.cz.; Centre for Manufacturing and Materials, Coventry University, Coventry, UK. 150560@mail.muni.cz., Hilger DM; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Canada., Blowes DW; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Canada., Ptacek CJ; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Canada.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 Dec 27; Vol. 13 (1), pp. 23048. Date of Electronic Publication: 2023 Dec 27.
DOI: 10.1038/s41598-023-50435-3
Abstrakt: The Northwest Tailings Containment Area at the inactive Giant Mine (Canada) contains a complex mixture of arsenic-containing substances, including flotation tailings (84.8 wt%; with 0.4 wt% residual S), roaster calcine wastes (14.4 wt% Fe oxides), and arsenic trioxide (0.8 wt%) derived from an electrostatic precipitator as well as As-containing water (21.3 ± 4.1 mg L -1 As) derived from the underground mine workings. In the vadose zone the tailings pore water has a pH of 7.6 and contains elevated metal(loid)s (2.37 ± 5.90 mg L -1 As); mineral oxidizers account for 2.5% of total 16S rRNA reads in solid samples. In the underlying saturated tailings, dissolved Fe and As concentrations increase with depth (up to 72 and 20 mg L -1 , respectively), and the mean relative abundance of Fe(III)-reducers is 0.54% of total reads. The potential for As mobilization via both reductive and oxidative (bio)processes should be considered in Giant Mine remediation activities. The current remediation plan includes installation of an engineered cover that incorporates a geosynthetic barrier layer.
(© 2023. The Author(s).)
Databáze: MEDLINE
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