Effect of hydraulic retention time on sulfate reduction in a carbon monoxide fed thermophilic gas lift reactor

J. Sipma, M.B. Osuna, G. Lettinga, A.J.M. Stams, P.N.L. Lens

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24 Citations (Scopus)

Abstract

Thermophilic hydrogenogenic carbon monoxide (CO) converting microorganisms present in anaerobic sludge play a crucial role in the application of CO as electron donor for sulfate reduction. Hydrogenogenic CO conversion was investigated in a gas lift reactor (55 °C) at different hydraulic retention times (HRT). Operation at a HRT>9 h resulted in predominant consumption of CO-derived H2 by methanogens (up to 90%) and thus in a poor sulfate reduction efficiency of less than 15%. At HRTs5.5 h resulted in a dominance of methanogenesis over sulfate reduction. The sulfate reduction rates were limited by the amount of CO supplied and its conversion efficiency (about 85%) at higher CO loads likely resulting from a low biomass retention.
Original languageEnglish
Pages (from-to)1995-2003
JournalWater Research
Volume41
Issue number9
DOIs
Publication statusPublished - 2007

Keywords

  • biological sulfate
  • reducing bacteria
  • conversion
  • growth
  • energy
  • co
  • methanol
  • h-2

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