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    Enhancing As(V) adsorption and passivation using biologically formed nano-sized FeS coatings on limestone: implications for acid mine drainage treatment and neutralization

    Liu, J. and Zhou, L. and Dong, F. and Hudson-Edwards, Karen A. (2017) Enhancing As(V) adsorption and passivation using biologically formed nano-sized FeS coatings on limestone: implications for acid mine drainage treatment and neutralization. Chemosphere 168 , pp. 529-538. ISSN 0045-6535.

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    Abstract

    The iron-reducing bacterium Acidiphilium cryputum JF-5 and a sulfate reducing bacterium (SRB) collected and purified from the mine drainage of a copper mine in the northwest of Sichuan Province, China, were used to biologically synthesize nano-sized FeS-coated limestone to remove As(V) from solution. The adsorption efficiency of As(V) is improved from 6.64 μg/g with limestone alone to 187 μg/g with the FeS coated limestone in both batch and column experiments. The hydraulic conductivity of the columns are also improved by the presence of the nano-sized FeS coatings, but the solution neutralization performance of the limestone can be reduced by passivation by gypsum and Fe(III) precipitates. Calculations for FeS-coated limestone dissolution experiments show that the process can be described as nCa.sol=At1/2-nCa,gyp. The results suggest that FeS-coated limestone may be an effective medium for remediating As(V)-bearing solutions such as acid mine drainage in systems such as Permeable Reactive Barriers.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Fe-reducing bacteria, Sulfate-reducing bacteria, Sorption, Arsenic(V), Nano, FeS-coated limestone
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Karen Hudson Edwards
    Date Deposited: 21 Dec 2016 11:12
    Last Modified: 14 Nov 2017 01:10
    URI: http://eprints.bbk.ac.uk/id/eprint/17785

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