Feroxsm (Zero Valent Iron)
Current Technology:
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The current approach to in situ reduction of chlorinated hydrocarbons or heavy metals using zero-valent iron employs the construction of permeable reaction walls, or funnel and gate systems for continual passive treatment of dissolved phase contaminants. These types of passive treatment technologies are designed to be placed on the down-gradient side of a plume to intercept groundwater flow prior to its migration off-site. As the dissolved phase contamination flows through the permeable reaction wall, reduction of the hydrocarbons and heavy metals occurs. Though these types of passive treatment systems are simple to apply at shallow depths and for low concentration levels of chlorinated organics, their applicability and cost effectiveness are greatly limited at deeper depths and higher concentrations. |
FEROXsm Description:
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The patented FEROXsm technology consists of the integration of two commercially proven processes to provide a cost-effective in situ treatment method for groundwater and soils contaminated with halogenated organic compounds, and/or leachable heavy metals. To apply the FEROXsm an open borehole or our direct-push injector assembly casing is used to position the downhole apparatus into the subsurface. Once in place, zero-valent iron powder is injected into the formation as a slurry or as a dry material. Nitrogen gas or compressed air are used as the carrier fluid. |
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Compounds Degraded:
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The atomized multi-phase injection approach provides several key benefits over conventional injection techniques. These include:
- Aggressive mixing / recirculation maintains the iron powder in uniform suspension and allows for the reaction of the iron powder with water to be accelerated
- Providing added moisture necessary for the reaction when applying in an unsaturated zone.
- Allows the iron powder to be injected into the formation to significant radial distances using relatively low pressures (<150 psi).
This gas slurry injection technique has been shown to influence consolidated formations to distances of more than sixty feet from the injection well. In practice, the injections are applied across an 18-24 inch intervals of the subsurface using a straddle packer assembly.
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Related Articles:
- ARS Installs 90-foot Deep Feroxsm System to Treat Chlorinated VOC Source Zone
- Ferox Application in Tight Clay Geology in Tennessee
- The use of zero-valent iron injection to remediate groundwater: Results of a pilot test at the Marshall Space Flight Center
- ARS Completes Deep Ferox Application
- Ferox Technology Pilot Test at DOD Facility in Texas
- Ferox Technology Demonstration at Hunter’s Point Navy Yard
- ARS Performs two Feroxsm Projects for the NAVY
- Additional work regarding Ferox Treatment of Freon-113
- Ferox Chromium (Cr +6) Treatment (Lab.)
- Ferox (Cr+6) Reduction (Field Application)
- Ferox Project Selected for NATO Meeting in Rome, Italy
- FEROX Biological Update Microbiological Effect of using Zero-Valent Iron Powder
- FEROX TCE Reduction - Oklahoma Facility
- Patent Issued Ferox Technology
- Ferox technology applications at various sites across the nation
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