Reductive Leaching of Jarosites by Shewanella putrefaciens - Influence of Humic Substances and Chelators in Mineral Dissolution

Laura Castro; J.A. Muñoz; F. González; M. Luisa Blázquez; Antonio Ballester

doi:10.4028/www.scientific.net/AMR.1130.450

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Reductive Leaching of Jarosites by Shewanella putrefaciens - Influence of Humic Substances and Chelators in Mineral Dissolution

Abstract:

The anaerobic bioreduction of three Fe (III) ores by a type strain of Shewanella putrefaciens has been investigated. The release of ferrous ion indicated the microbial reduction of jarosite and promotes the subsequent secondary mineralization, leading to the formation of various iron-nearing minerals. In addition, the influence of citrate and EDTA in the medium acting as chelating agents, and an electron shuttling molecule were studied. While the citrate and humic substances increased the iron reduction rate, AQDS inhibit the mineral bioreduction and dissolution. S. putrefaciens do not have the necessity of the direct contact between cells and jarosites and, in consequence, cell attachment and biofilm formation on the mineral surface is scant.

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Periodical:

Advanced Materials Research (Volume 1130)

Pages:

450-453

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1130.450

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Online since:

November 2015

Authors:

Laura Castro, J.A. Muñoz, F. González, M. Luisa Blázquez, Antonio Ballester*

Keywords:

Chelators, Humic Substances, Reductive Bioleaching, Shewanella putrefaciens

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