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    Arsenic remediation by formation of arsenic sulfide minerals in a continuous anaerobic bioreactor

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    Arsenic_remediation_Rodriguez_ ...
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    Description:
    Final Accepted Manuscript
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    Author
    Rodriguez-Freire, Lucia
    Moore, Sarah E
    Sierra-Alvarez, Reyes
    Root, Robert A
    Chorover, Jon
    Field, James A
    Affiliation
    Univ Arizona, Dept Chem & Environm Engn
    Univ Arizona, Dept Soil Water & Environm Sci
    Issue Date
    2016-03-01
    Keywords
    arsenate reduction
    biomineralization
    bioremediation
    orpiment
    realgar
    sulfate reduction
    
    Metadata
    Show full item record
    Publisher
    WILEY
    Citation
    Rodriguez‐Freire, L. , Moore, S. E., Sierra‐Alvarez, R. , Root, R. A., Chorover, J. and Field, J. A. (2016), Arsenic remediation by formation of arsenic sulfide minerals in a continuous anaerobic bioreactor. Biotechnol. Bioeng., 113: 522-530. doi:10.1002/bit.25825
    Journal
    BIOTECHNOLOGY AND BIOENGINEERING
    Rights
    © 2015 Wiley Periodicals, Inc.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Arsenic (As) is a highly toxic metalloid that has been identified at high concentrations in groundwater in certain locations around the world. Concurrent microbial reduction of arsenate (AsV) and sulfate (SO42-) can result in the formation of poorly soluble arsenic sulfide minerals (ASM). The objective of this research was to study As biomineralization in a minimal iron environment for the bioremediation of As-contaminated groundwater using simultaneous AsV and SO42- reduction. A continuous-flow anaerobic bioreactor was maintained at slightly acidic pH (6.25-6.50) and fed with AsV and SO42-, utilizing ethanol as an electron donor for over 250 d. A second bioreactor running under the same conditions but lacking SO42- was operated as a control to study the fate of As (without S). The reactor fed with SO42- removed an average 91.2% of the total soluble As at volumetric rates up to 2.9 mg As/(L∙h), while less than 5% removal was observed in the control bioreactor. Soluble S removal occurred with an S to As molar ratio of 1.2, suggesting the formation of a mixture of orpiment- (As2S3) and realgar-like (AsS) solid phases. Solid phase characterization using K-edge X-Ray absorption spectroscopy confirmed the formation of a mixture of As2S3 and AsS. These results indicate that a bioremediation process relying on the addition of a simple, low-cost electron donor offers potential to promote the removal of As from groundwater with naturally occurring or added sulfate by precipitation of ASM.
    Note
    12 month embargo; published online: 2 September 2015
    ISSN
    1097-0290
    PubMed ID
    26333155
    DOI
    10.1002/bit.25825
    Version
    Final accepted manuscript
    Additional Links
    https://onlinelibrary.wiley.com/doi/full/10.1002/bit.25825
    ae974a485f413a2113503eed53cd6c53
    10.1002/bit.25825
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