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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
15:19

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Published on: October 15, 2015

A kinetic study on bacterial sulfate reduction.

L A Bernardez1, L R P de Andrade Lima, E B de Jesus

  • 1Department of Bio-Interaction Sciences, Federal University of Bahia, Av. Reitor Miguel Calmon, s/n, Vale do Canela, Salvador, Bahia, 40110-902, Brazil, leticiab@ufba.br.

Bioprocess and Biosystems Engineering
|May 3, 2013
PubMed
Summary
This summary is machine-generated.

Anaerobic sulfate reduction by bacteria from oil reservoirs shows sulfate conversion and sulfide generation are first-order processes. Higher initial sulfate concentrations inhibit sulfate conversion but minimally affect sulfide generation.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Petroleum Engineering

Background:

  • Sulfate-reducing bacteria (SRB) are prevalent in oil reservoir environments.
  • Understanding SRB activity is crucial for managing reservoir souring and infrastructure integrity.

Purpose of the Study:

  • To investigate the kinetics of anaerobic sulfate reduction and sulfide generation.
  • To determine the effect of initial sulfate concentration on these processes in Brazilian oil reservoir water.

Main Methods:

  • Isolation of sulfate-reducing bacteria from oil reservoir water.
  • Measurement of redox potential, biomass, sulfate, and sulfide concentrations.
  • Kinetic analysis of sulfate conversion and sulfide generation.

Main Results:

  • Sulfate conversion and sulfide generation followed first-order kinetics at initial sulfate concentrations of 823, 1,282, and 1,790 mg/L.
  • Sulfate conversion rate decreased with increasing initial sulfate concentration, indicating inhibition.
  • Sulfide generation rate was largely independent of initial sulfate concentration, suggesting faster preceding steps.

Conclusions:

  • Anaerobic sulfate reduction and sulfide generation kinetics are influenced by initial sulfate levels.
  • Inhibition of sulfate conversion at higher sulfate concentrations was observed.
  • Sulfide generation is primarily controlled by microbial sulfate conversion rates, which are slower than other sequential reactions.