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Influence of the Iron-Reducing Bacteria on the Release of Heavy Metals in Anaerobic River Sediment

Abstract : The impact of autochthonous anaerobic bacteria on the release of metals in river sediment was studied. The sediments were characterized and bacterial activity was monitored in a batch reactor, where the sediments were incubated with a synthetic substrate solution containing glucose as carbon source. The results showed that metal release was correlated to the bacterial growth (carbon mineralization). In particular, a relationship between iron reduction and metal release was observed indicating that iron-reducing bacteria had a strong influence. By reductive dissolution of iron oxides, bacteria also released their associated toxic elements into the liquid phase. While organic analysis showed acetate and butyrate production leading to a decrease in pH and indicating a Clostridium fermentative bacteria activity, the results did not indicate any direct role of organic acids in the dissolution of iron and their associated metals.
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https://hal-bioemco.ccsd.cnrs.fr/bioemco-00456373
Contributor : Noureddine Bousserrhine <>
Submitted on : Sunday, February 14, 2010 - 7:10:26 PM
Last modification on : Saturday, September 19, 2020 - 4:47:54 AM

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Catherine Gounou, Noureddine Bousserrhine, Gilles Varrault, Jean-Marie Mouchel. Influence of the Iron-Reducing Bacteria on the Release of Heavy Metals in Anaerobic River Sediment. Water, Air, and Soil Pollution, Springer Verlag, 2010, 212 (1-4), pp.10.1007/s11270-010-0327-y. ⟨10.1007/s11270-010-0327-y⟩. ⟨bioemco-00456373⟩

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