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Sulfolane attenuation by surface and subsurface soil matrices.

R Saint-Fort1

  • 1Department of Chemical, Biological & Environmental Sciences, Faculty of Science & Technology, Mount Royal College, Calgary, Alberta, Canada. rsaintfort@mtroyal.ca

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|June 9, 2006
PubMed
Summary

Sulfolane (tetrahydrothiophene-1, 1-dioxide) attenuation by soil is rapid and best described by the Freundlich equation, with sorption unaffected by temperature or ionic strength. Biodegradation is slow, influenced by depth, nitrogen, and temperature.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Environmental Chemistry

Background:

  • Sulfolane is a contaminant commonly found at sour gas plant sites.
  • Understanding its environmental fate, including sorption and biodegradation, is crucial for site remediation.

Purpose of the Study:

  • To evaluate the attenuation of sulfolane by soil and subsurface materials.
  • To investigate the kinetics and influencing factors of sulfolane sorption and biodegradation.

Main Methods:

  • Batch equilibration systems were used to study sulfolane sorption on various soil samples.
  • Sorption kinetics were analyzed using first-order and Freundlich models.
  • Biodegradation was assessed under anaerobic conditions in microcosms at different temperatures and nutrient levels.

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Main Results:

  • Sulfolane sorption was rapid, reaching equilibrium within 5 hours, and followed first-order kinetics, best described by the Freundlich equation.
  • Sorption was not significantly affected by temperature (8-25°C) or ionic strength, suggesting dipole-dipole interactions.
  • No significant sulfolane biodegradation was observed under anaerobic conditions, but rates increased with nitrogen addition and decreased with depth and temperature.

Conclusions:

  • Sulfolane attenuation in soil is primarily governed by sorption, with limited biodegradation under the studied anaerobic conditions.
  • Soil properties significantly influence sulfolane sorption, as indicated by multiple regression analysis.
  • Optimizing nitrogen availability and managing temperature could enhance sulfolane biodegradation in contaminated environments.