Ferox Flow is Hepure’s most versatile ZVI product, capable of treating numerous contaminant types (CVOCs, Metals, and PCBs) in a variety of geological settings (i.e. unsaturated/saturated zone, silt, clay, and bedrock). The particle size is ideal for providing high reactivity and long treatment life.
Ferox Flow reacts abiotically with contaminants, bypassing the more harmful daughter products (i.e. DCE and vinyl chloride). The reactivity is driven by surface area and is an important element in design of ZVI treatment projects. Ferox Flow is 95% pure ZVI containing no residual oils. The patented manufacturing process produces a consistent product from cast iron stock with over 90% of the particles in the 100 to 150 micron size range.
|Contaminants Treated||Grain Size||Reactivity||Bulk Density||Packaging|
|Halogenated aliphatics (PCE, TCE, TCA)|
|Mesh: -100/+325||Rate Constant – 0.343/day||2.68 g/cm3||Drums/Buckets – 50 kg or 100 kg|
|Micron: 100 – 150||Surface Area – 4.81 m2/g||167 lb/ft3||Super Sacks – 500 – 1000 kg|
Ferox Flow’s uniform particle size provides exceptional cost-effective performance. The substantial number of catalytic sites on the powder surface ensures superior reactivity and supports lower ZVI loading requirements in comparison to other ZVI materials. Figure 1 shows a comparison of ZVI iron powder ability to degrade Trichloroethylene (TCE).
Ferox Flow is a direct replacement for many dechlorination amendments providing a long term treatment solution when high contaminate concentrations may lead to formation of DCE and VC in excess of the amendments capacity. Ferox Flow is commonly mixed with emulsified vegetable oil and sodium lactate to make an eZVI solution, Ferox Plus. The long term biological dechlorination process utilizing EVO/Lactate is a proven compliment to the abiotic dechlorination of ZVI. Ferox Flow can also be combined with Ferox Target to provide additional reactivity and longevity for high concentrations or source area DNAPL.
Ferox Flow can be injected by conventional DPT or using high pressure hydraulic and pneumatic fracturing. Typical slurry injection concentrations are between 4 and 9 pounds of ZVI per gallon. Under these conditions, the carrier fluid (i.e. water, EVO, other) must be continually circulated to keep the ZVI suspended. Alternatively, guar gum is used to create a temporary suspension in the liquid phase for injections. Ferox Flow may also be emplaced by soil mixing using traditional auger, pug mill, or excavator mixing methods.