Temporal evolution of surface and sub-surface geochemistry and microbial communities of Pb-rich mine tailings during phytostabilization: A one-year pilot-scale study. (15th September 2022)

• Record Type: Journal Article
• Authors: Thouin, Hugues; Norini, Marie-Paule; Battaglia-Brunet, Fabienne; Gautret, Pascale; Crampon, Marc; Le Forestier, Lydie
• Is Part Of: Journal of environmental management. Volume 318(2022)
• Publication Date: 2022-09-15
• Subjects: Mine tailings -- Metals -- Assisted phytostabilization -- Laboratory pilot -- Microbial diversity; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.115538
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Old mine waste repositories can present health and/or environmental issues linked to their erosion, inducing dissemination of metals and metalloids in air and water that can be attenuated through phytostabilization. Here, the effect of this widespread phytomanagement option on the biogeochemistry of a Pb-rich mine waste was evaluated with a laboratory pilot-scale experiment giving access to the non-saturated and saturated zones below the rhizosphere compartment. Amendment of the tailings surface with biochar, manure and iron-oxide-rich ochre promoted growth of the seeded Agrostis capillaris plants. These events were accompanied by an increase of pH and a decrease of Pb concentration in pore water of the surface layer, and by a transient increase of Pb, Zn, and Ba concentrations in the deeper saturated levels. Macroscopic and microscopic observations (SEM) suggest that Pb was immobilized in A. capillaris rhizosphere through mechanical entrapment of tailing particles. Microbial taxonomic and metabolic diversities increased in the amended phytostabilized surface levels, with a rise of the proportion of heterotrophic micro-organisms. Below the surface, a transient modification of microbial communities was observed in the non-saturated and saturated levels, however 11 months after seeding, the prokaryotic community of the deepest saturated zone was close to that of the initial tailings. pH and water saturation seemed to be the main parameters driving prokaryotic communities' structures. Results obtained at pilot-scale will help to precisely evaluate the impacts of phytostabilization on the temporal evolution of reactions driving the fate of pollutants inside the tailings dumps. Graphical abstract: Image 1 Highlights: Phytostabilization influenced the biogeochemistry of a Ag–Pb mine tailing. Surface amendment helped growth of Agrostis capillaris and decreased lead mobility. Amendment modified geochemistry and microbial communities at different depths. Transient modification of microbial communities and activities was observed. Mesocosm scale gave access to temporal and spatial effects of phytostabilization.