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Persulfate injection into a gasoline source zone.

Kanwartej S Sra1, Neil R Thomson, Jim F Barker

  • 1Department of Civil and Environmental Engineering, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, Canada. ksra@golder.com

Journal of Contaminant Hydrology
|May 11, 2013
PubMed
Summary
This summary is machine-generated.

Sodium persulfate effectively treated a gasoline source zone by reducing contaminant mass loading by up to 86%. Some rebound occurred, but overall discharge was significantly lower, indicating successful in-situ chemical oxidation.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Remediation Technology

Background:

  • Gasoline-contaminated sites pose significant environmental risks.
  • In-situ chemical oxidation (ISCO) is a promising remediation strategy.
  • Sodium persulfate is an effective ISCO oxidant for petroleum hydrocarbons.

Purpose of the Study:

  • To evaluate the effectiveness of sodium persulfate for treating a gasoline source zone.
  • To monitor the fate and transport of persulfate and gasoline compounds post-injection.
  • To assess the impact of persulfate on dissolved inorganic carbon and mineralization.

Main Methods:

  • Injection of sodium persulfate into a gasoline source zone at CFB Borden.
  • Monitoring of inorganic species and gasoline compounds using multilevel sampling points (>10 months).
  • Calculation of mass loading (M˙) to assess contaminant reduction and mineralization.

Main Results:

  • Persulfate breakthrough and consumption were observed, indicating oxidation of gasoline compounds.
  • Dissolved inorganic carbon (DIC) increased by >100%, suggesting mineralization.
  • Mass loading of gasoline compounds reduced by 46-86% during oxidant passage.
  • Cumulative mass discharge was 19-58% lower than without persulfate.
  • A partial rebound (40-80% of baseline) in mass discharge was observed after flushing.

Conclusions:

  • Sodium persulfate effectively reduced gasoline source zone contamination.
  • Mineralization of gasoline compounds occurred during the treatment.
  • Further monitoring is needed to assess long-term effectiveness due to observed rebound.