Long term performance of an arsenite-oxidizing-chlorate-reducing microbial consortium in an upflow anaerobic sludge bed (UASB) bioreactor

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17 Scopus citations

Abstract

A chlorate (ClO3-) reducing microbial consortium oxidized arsenite (As(III)) to arsenate (As(V)) in an upflow anaerobic sludge-bed bioreactor over 550days operation. As(III) was converted with high conversion efficiencies (>98%) at volumetric loadings ranging from 0.45 to 1.92mmol As/(Lreactord). The oxidation of As(III) was linked to the complete reduction of ClO3- to Cl- and H2O, as demonstrated by a molar ratio of approximately 3.0mol As(III) oxidized per mole of Cl- formed and by the greatly lowered ClO3--reducing capacity without As(III) feeding. An autotrophic enrichment culture was established from the bioreactor biofilm. A 16S rRNA gene clone library indicated that the culture was dominated by Dechloromonas, and Stenotrophomonas as well as genera within the family Comamonadaceae. The results indicate that the oxidation of As(III) to less mobile As(V) utilizing ClO3- as a terminal electron acceptor provides a sustainable bioremediation strategy for arsenic contamination in anaerobic environments.

Original languageEnglish (US)
Pages (from-to)5010-5016
Number of pages7
JournalBioresource Technology
Volume102
Issue number8
DOIs
StatePublished - Apr 1 2011

Keywords

  • Arsenite oxidation
  • Bioremediation
  • Chlorate reduction
  • Clone library
  • UASB bioreactor

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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