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

Rodriguez-Freire, Lucia ; Moore, Sarah E. ; Sierra-Alvarez, Reyes ; Root, Robert A. ; Chorover, Jon ; Field, James A.

Biotechnology and bioengineering, 2016-03, Vol.113 (3), p.522-530 [Periódico revisado por pares]

United States: Blackwell Publishing Ltd

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  • Título:
    Arsenic remediation by formation of arsenic sulfide minerals in a continuous anaerobic bioreactor
  • Autor: Rodriguez-Freire, Lucia ; Moore, Sarah E. ; Sierra-Alvarez, Reyes ; Root, Robert A. ; Chorover, Jon ; Field, James A.
  • Assuntos: Anaerobiosis ; arsenate reduction ; Arsenic ; Arsenic - metabolism ; Arsenicals - metabolism ; biomineralization ; Bioreactors ; Bioreactors - microbiology ; Bioremediation ; Formations ; Groundwater ; Groundwater - chemistry ; Hydrogen-Ion Concentration ; Minerals ; Minerals - metabolism ; orpiment ; realgar ; Reduction ; sulfate reduction ; Sulfates ; Sulfides - metabolism ; Water Purification ; X-Ray Absorption Spectroscopy
  • É parte de: Biotechnology and bioengineering, 2016-03, Vol.113 (3), p.522-530
  • Notas: ArticleID:BIT25825
    Arizona Water Sustainability Program
    National Institute of Environment and Health Sciences-supported Superfund Research Program - No. NIH ES-04940
    ark:/67375/WNG-T5Q13SFN-T
    istex:137B7E8AFDE6CF45679512B8636741BD7E8D9447
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 SO42− by precipitation of ASM. Biotechnol. Bioeng. 2016;113: 522–530. © 2015 Wiley Periodicals, Inc. Arsenic immobilization as an arsenic‐sulfide mineral (ASM) was studied in a continuous anaerobic bioreactor. Concurrent microbial reduction of arsenate and sulfate stimulated the precipitation of a mixture of orpiment (As2S3)‐ and realgar (AsS)‐like solids. The arsenic removal rate in the bioreactor was 2.9 mg/(L · h) and accounted for 91% removal of the total soluble arsenic. Less than 5% of the soluble arsenic added was removed in a control bioreactor operated under the same conditions but lacking sulfate addition.
  • Editor: United States: Blackwell Publishing Ltd
  • Idioma: Inglês
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