InSitu Remediation Services Limited (IRSL)

InSitu Remediation Services Limited (IRSL)

Cosolvent Flushing

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Mobilizing contaminants for efficient extraction. Cosolvent flushing involves injecting a solvent mixture, such as water with alcohol, into an aquifer impacted with Non-Aqueous Phase Liquids (NAPLs) to solubilize and increase the mobility of the compounds. The solvent and the solubilized NAPL are then removed through extraction wells, and either treated on-site or disposed of off-site. The cosolvent mixture is typically injected up-gradient of the contaminated area and allowed to flow through the impacted area. The cosolvent with the mobilized contaminants is then extracted. A reverse gradient approach may also be used, which involves injecting at the down-gradient edge of impacts and then pumping the cosolvent solution from up-gradient wells.

Experience
Removal of Non-Aqueous Phase Liquids (NAPLs) such as spent degreasing solvents (TCE and TCA), dry cleaning solvents (PCE), heavy fuel oils, and coal tar/creosote, can be one of the most challenging processes in remedial programs. IRSL offers our clients extensive experience remediating NAPLs using a variety of cosolvents.

Approach
Cosolvents, such as alcohol, increase the solubility, and hence the mobility, of various chemical contaminants, including chlorinated solvents and petroleum hydrocarbons.

Cosolvents can promote contaminant removal by:

  • Increasing the solubility of the contaminant in water, which improves the mass removal per pore volume.
  • Increasing the bioactivity of the system by increasing the mass of readily available substrates.
  • Aiding in the manipulation of the geochemical conditions of the subsurface in order to promote various geochemical breakdown reactions.

Geology Addressed

  • Fill Materials
  • Fluvial Deposits
  • Fractured Carbonate Rock
  • Fractured Shale
  • Glacial Till

Compounds Delivered

  • Alcohol
  • Methanol
  • Propanol

Contaminates Mitigated

  • Aromatic Volatile Organic Compounds
  • Chlorinated Ethanes
  • Chlorinated Ethenes
  • Petroleum Hydrocarbons
  • Polycyclic Aromatic Hydrocarbons

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