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In-situ Remediation Services - Chemical Reduction
Harnessing powerful reducing compounds to chemically mitigate impacts in place. 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.
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.
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.