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Article Dans Une Revue Water Research Année : 2003

Bacterial immobilization and oxidation of arsenic in acid mine drainage (Carnoulès creek, France)

Résumé

The acid waters (pH=2.73–3.37) originating from the Carnoulès mine tailings contain high dissolved concentrations of arsenic (1–3.5 mmol l−1) and iron (20–40 mmol l−1). At the outlet, arsenite predominates. During the first 30 m of downflow, 20–60% is removed by coprecipitation with Fe(III). This process results from bacterially mediated As- and Fe-oxidation. The precipitation rates in the creek depend on the oxygen concentration in spring water and are lower during the dry summer period when the anoxic character of the spring water inhibits the activity of oxidizing bacteria. Ex situ experiments show that the presence of bacteria-rich precipitates increases the As- and Fe-removal rates. Three strains of bacteria promoting the oxidation of As have been isolated, and two of them have the characteristics of Thiomonas ynys1. The third strain, which is not identified yet, also catalyzes the oxidation of Fe.
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Dates et versions

hal-03533985 , version 1 (08-02-2022)

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Corinne Casiot, Guillaume Morin, Farid Juillot, Odile Bruneel, Jean-Christian Personné, et al.. Bacterial immobilization and oxidation of arsenic in acid mine drainage (Carnoulès creek, France). Water Research, 2003, 37 (12), pp.2929-2936. ⟨10.1016/S0043-1354(03)00080-0⟩. ⟨hal-03533985⟩
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