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<p>This study aimed to acquire proof of concept validity, at the laboratory and theoretical levels, of an integrated remediation strategy involving sulfate-reducing bacteria (SRB) and composted phytostabilization plant biomass. A model mine site presenting both historic mine waste dumps and acid mine drainage (AMD) was chosen to test the integrated bioremediation scheme. A microbial consortium from a SRB bioreactor treating AMD was adapted to grass compost as the sole carbon and energy source. It was then used to assess the feasibility of feeding SRB with the AMD of a former tin mine and compost prepared with phytostabilization plant biomass from the site, inducing SO<sub>4</sub> reduction and the precipitation of metals (Fe, Co, Ni). A 7-week-old grass compost used at 1–5% (wet weight) efficiently supported SBR activity. Results showed a decrease of sulfate concentration whose maximum amplitude was reached (from 1500 to less than 100 mg/L SO<sub>4</sub>) with 10% compost (wt% in liquid medium). Sulfate reduction rate increased with compost concentration from 1 to 5%, and the highest efficiency, in terms of mg reduced SO<sub>4</sub> by mg of provided compost was obtained with 1% compost. All inoculated cultures induced precipitation of Fe, Co, and Ni. The proportion of SRB genera in the final bacterial communities ranged from 13 to 20%. The proportion of <i>Desulfoscipio</i> and <i>Desulfallas</i> in the SRB community increased with increasing compost concentration. The results suggest that compost from phytostabilization plant biomass is suitable to feed SRB bioreactors for AMD treatment on-site.</p> Graphical Abstract <p></p>

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Microbial Sulfate Reduction Fed with Phytostabilization Biomass Compost: An Integrated Bioremediation Strategy for Mine Tailings and Drainage

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Fabienne Battaglia-Brunet,
  • Caroline Michel,
  • Hafida Tris,
  • Jérôme Jacob,
  • Louis de Lary de Latour,
  • Valérie Guérin,
  • Catherine Joulian,
  • Christopher G. Bryan

摘要

This study aimed to acquire proof of concept validity, at the laboratory and theoretical levels, of an integrated remediation strategy involving sulfate-reducing bacteria (SRB) and composted phytostabilization plant biomass. A model mine site presenting both historic mine waste dumps and acid mine drainage (AMD) was chosen to test the integrated bioremediation scheme. A microbial consortium from a SRB bioreactor treating AMD was adapted to grass compost as the sole carbon and energy source. It was then used to assess the feasibility of feeding SRB with the AMD of a former tin mine and compost prepared with phytostabilization plant biomass from the site, inducing SO4 reduction and the precipitation of metals (Fe, Co, Ni). A 7-week-old grass compost used at 1–5% (wet weight) efficiently supported SBR activity. Results showed a decrease of sulfate concentration whose maximum amplitude was reached (from 1500 to less than 100 mg/L SO4) with 10% compost (wt% in liquid medium). Sulfate reduction rate increased with compost concentration from 1 to 5%, and the highest efficiency, in terms of mg reduced SO4 by mg of provided compost was obtained with 1% compost. All inoculated cultures induced precipitation of Fe, Co, and Ni. The proportion of SRB genera in the final bacterial communities ranged from 13 to 20%. The proportion of Desulfoscipio and Desulfallas in the SRB community increased with increasing compost concentration. The results suggest that compost from phytostabilization plant biomass is suitable to feed SRB bioreactors for AMD treatment on-site.

Graphical Abstract