Ferox Zero Valent Iron Powders

Why Choose Zero Valent Iron Powder?

Zero valent iron (ZVI) powders are inert metallic iron shavings capable of treating chlorinated solvents abiotically, avoiding the production of harmful daughter products (DCE and VC). The use of ZVI as an in situ chemical reductant has become increasingly popular with the advancement of application processes. With smaller particle sizes and increased sophistication of injection equipment, zero valent iron powder is commonly injected in source areas and hard to reach areas where a typical permeable reactive barrier (PRB) is not feasible.

Benefits of Using Zero Valent Iron Powder (ZVI):

  • Cost-effective – ZVI provides the most value in consideration of reactivity and longevity in comparison to chemical oxidants
  • Safe – does not contain harmful chemicals and are safer to handle when compared to chemical oxidants
  • Long-term treatment (3-15 years longevity) – zero valent iron powder provides a long term treatment solution
  • Sustainable/recycled/green – Hepure’s ZVI is recycled iron cuttings from production facilities which may be otherwise disposed at a landfill
  • Destroys contaminants with no toxic end products or by-products – ZVI is a biotic reaction which destroys the contaminate with no intermediation by products such as dichloroethane and vinyl chloride
  • Synergistic with bioremediation treatments – conditions the aquifer for ongoing bioremediation without providing potential bio-toxic chemicals or unfavorable aquifer conditions such as pH
  • Not impacted by Soil Oxidant Demand (SOD) – does not react with the soil so all reactivity can be directed to the contaminant

ZVI Case Studies

Not All Zero Valent Iron Powders are the Same

Hepure’s ZVI is produced exclusively for environmental remediation. Ferox zero valent iron powders are provided in three uniform density and mesh sizes while being free of rust, dust, and potentially harmful lubricating oils, providing a more cost-effective and efficient remediation solution

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Ferox PRB
Zero Valent Iron Powder

Made with barrier applications in mind. Ferox PRB has a larger particle size than Ferox Flow and is ideal for providing effective reactivity with a treatment life over 10 years. The larger particle size will remain within the barrier with no diffusion or settling.

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Ferox Flow
Zero Valent Iron Powder

A highly reactive, remediation grade, zero valent iron (ZVI) powder proven to work in the treatment of environmentally contaminated zones adjacent/down-gradient to contaminant source areas.

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Ferox Target
Zero Valent Iron Powder

Engineered for environmental remediation applications within the unsaturated and saturated source area(s).

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TECHNICAL INFORMATION

Treated Contaminants:

Organic Compounds Inorganic Compounds
Methanes tetrachloromethane
trichloromethane
dichloromethane
Chromium
Nickel
Lead
Uranium
Technetium
Iron
Manganese
Selenium
Copper
Cobalt
Cadmium
Zinc
Ethanes hexachloroethane
1,1,1-trichloroethane
1,1,2-trichloroethane
1,1-dichloroethane
Anion
Contaminants
Sulfate
Nitrate
Phosphate
Arsenic
Ethenes tetrachloroethene
trichloroethene
cis-1,2-dichloroethene
trans-1,2-dichloroethene
1,1-dichloroethene
vinyl chloride
Propanes 1,2,3-trichloropropane
1,2-dichloropropane
Aromatics benzene
toluene
ethylbenzene
Other hexachlorobutadiene
1,2-dibromoethane
freon 113
N-nitrosodimethylamine

Pathways for Contaminant Reduction

Zero valent iron is capable of reducing chlorinated compounds to harmless components, as shown in the general reaction formula below:

2Fe0 + R-Cl + 3H2O → 2Fe2+ + R-H + 3OH + H2 + Cl (R = Aryl group)

The chlorinated compounds can be reduced as follows:

1. Reduction at the metal surface in the presence of a proton donor

Fe0 + R-Cl + H+ → Fe2+ + R-H+ Cl (1)

2. Continuation of reaction 1 by the further oxidation of Fe2+ to Fe3+

2Fe2+ + R-Cl + H+→ 2Fe3+ + R-H+ Cl (2)

3. The hydrogen gas which is produced in the corrosion reaction of water with zero-valent iron can also be involved in the dechlorination of VOCs.

Fe0 + 2H2O → Fe2+ + H2 + 2OH (3)

H2 + R-Cl → R-H + H+ + Cl (4)

In the estimate of the amount of zero valent iron needed, the reaction of zero valent iron with dissolved oxygen (5), water (3) and other oxidized organic and inorganic components (e.g. nitrate, sulfate) must also be taken into account.

2Fe0 + 4H+ + O2 → 2Fe2+ + 2H2O (5)

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