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Bioaugmentation for chlorinated ethenes using Dehalococcoides sp.: comparison between batch and column experiments.

Charles E Schaefer1, Charles W Condee, Simon Vainberg

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|January 28, 2009
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Summary
This summary is machine-generated.

Dehalococcoides (DHC) bacteria efficiently dechlorinate chlorinated ethenes in saturated soils. Aqueous DHC concentrations accurately estimate activity, which is significantly higher in porous media than in batch tests.

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Geochemistry

Background:

  • Chlorinated ethenes are common groundwater contaminants.
  • Bioaugmentation with Dehalococcoides sp. (DHC) is a promising remediation strategy.
  • Understanding DHC behavior in situ is crucial for effective remediation.

Purpose of the Study:

  • To evaluate the transport, growth, and dechlorination activity of DHC.
  • To compare DHC performance in batch versus column experiments.
  • To develop a predictive model for DHC-mediated bioremediation.

Main Methods:

  • Batch and column experiments were conducted.
  • Monod kinetic model was used to describe DHC growth and dechlorination.
  • Transport modeling incorporated enhanced dechlorination kinetics.

Main Results:

  • DHC growth and dechlorination followed Monod kinetics in batch tests.
  • Dechlorination occurred throughout the column, with negligible soil-phase DHC.
  • Aqueous DHC concentrations were significantly higher in columns than batch tests (approx. 200x).

Conclusions:

  • Aqueous DHC concentrations can predict dechlorination activity in saturated soils.
  • DHC dechlorination activity in porous media is substantially greater than in batch experiments.
  • Enhanced kinetics improve bioremediation transport model predictions.