IN-SITU REMEDIATION SERVICES: Chemical Reduction

Harnessing powerful reducing compounds to chemically mitigate impacts in place.

Experience

One of Canada’s most experienced firms in the design and implementation of In-Situ Chemical Reduction (ISCR) programs, we have conducted ISCR programs in a variety of geologic settings.

Approach

A relatively recent in-situ method of environmental remediation, and the mirror process to Chemical Oxidation, Chemical Reduction uses powerful reductant solutions to break down contaminants into to less-toxic compounds and harmless by-products, by transferring electrons from the reductant to the compound of concern.

Preparing for remediation on-site.

Geology Addressed

  • Alluvial Deposits
  • Fluvial Deposits
  • Fractured Carbonate Rock
  • Fractured Igneous and Metamorphic Rock
  • Fractured Shale
  • Glacial Deposits
  • Till

Compounds Delivered

  • Bimetals
  • Calcium Bisulphide
  • Calcium Sulphide
  • Ferrous Sulphate
  • Ferrous Sulphide
  • Sodium Diothionite
  • Zero-Valent Iron (macro, micro and nano)

Contaminates Mitigated

  • Arsenic
  • Chlorinated Ethanes
  • Chlorinated Ethenes
  • Chromium
  • Explosives
  • Heavy Multivalent Metals

Considerations

  • Choosing the best reductant solution for the contaminant and conditions requires experience and sound scientific knowledge.
  • The persistence of the reductant in the subsurface affects the contact time for advective and diffusive transport.
  • The reaction rate in the subsurface must be stabilized in order to enhance transport distances and persistence.
IRSL In-Situ Remediation Services - Project in Parking Lot

Details

The other half of a redox reaction, chemical reduction results in the gain of electrons. One of the reactants in the reaction is oxidized, losing electrons; the other reactant is reduced, gaining electrons. In In-Situ Chemical Reduction (ISCR), reducing compounds—compounds that accept electrons given by other compounds in a reaction—are injected into the subsurface to transform contaminants into harmless compounds.

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