Case study: surfactant enhanced HVDPE remediation of petroleum contaminated soil, bedrock and groundwater

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Courtesy of Ivey International Inc.

Recalcitrant petroleum product residuals sorbed in fine grain soils and fractured bedrock
Persistent concentrations in groundwater after 12 years of remediation - including pumping, HVDPE
Obtained regulatory approval for Ivey-sol surfactant application in spring 2009

Pilot Test Approach - Focused Short-Term Surfactant Injection/Extraction to Maximize Recovery

  • Ivey-sol 106 pilot scale injection undertaken over 5 days in July 2009
  • Four injection events, one injection well (MW15) and four extraction
  • HVDEP wells (MW2, 7, 8 and 11)
  • Five surrounding monitoring wells sampled during pilot
  • Mobile HVDPE system capable of 28 inch Hg vacuum and 800 SCFM
  • Groundwater HVDEP average recovery rate of 0.24 ppm
  • Recalcitrant petroleum product residuals in fractured bedrock Persistent concentrations in groundwater after 12 years of remediation - including pumping, HVDPE

Classes of Surfactants

  • Anionic: Have one or more negatively (-) charged groupings; commonly used in laundry detergent
  • Cationic: Have one or more positively (+) charged groupings, typically poor detergents but well suited tor use as germicides, tabric softeners and emulsifiers. Amphoteric: Contains both anionic and cationic groupings; prefer neutral pH and found in products such as hair shampoo, skin cleaners and carpet shampoo.
  • Ionic Surfactants make up >95% of the surfactant used around the world.
  • Non-ionic: Have no ionic constituents or groupings; largest single group of SAA (Surface Active Agent) and have a correspondingly wide range of chemical characteristics. Ivey-sol surfactant mixtures are non-ionic and have the unique ability to selectively desorb contamination (LNAPL, DNAPL's, PAH, PCB, DCE, TCE, PCE), etc.

Why Ivey-sol Surfactants?

  • Improves desorption of target contaminants in soil and groundwater
  • Lowers the surface tension of water improving both its wetting
  • and associated permeability (K) properties
  • Effective as a stand alone technology for soil and groundwater remediation
  • Effective to improve other remediation techniques (i.e., P&T,
  • Soil Washing, Bioremediation, Chemical Oxidation/Reduction)

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