Arsenic Remediation
Hepure’s zero valent iron products treat arsenic in groundwater through adsorption, co-precipitation, and chemical reduction.
About Arsenic Contamination
Arsenic is a naturally occurring metalloid that exists in groundwater as an anionic species — primarily arsenate (As⁵⁺, AsO₄³⁻) and arsenite (As³⁺, AsO₂⁻). Arsenic contamination can be natural (from certain geological formations) or anthropogenic (from mining, pesticide application, wood treatment, and industrial discharges). The EPA maximum contaminant level for arsenic in drinking water is 10 µg/L. Arsenic is a known human carcinogen with significant health effects from long-term exposure.
ZVI Treatment of Arsenic
Zero valent iron is one of the most effective technologies for arsenic removal from groundwater. As ZVI corrodes in the subsurface, it forms iron oxide/hydroxide surfaces that strongly adsorb arsenic species. Both arsenate (As⁵⁺) and arsenite (As³⁺) can be removed through this mechanism, though the specific removal efficiency depends on groundwater chemistry and redox conditions.
Application Approaches
Ferox PRB is commonly used in permeable reactive barriers for arsenic treatment, providing passive long-term remediation. Ferox Flow can be injected directly into contaminated zones for plume treatment. In combination with ferrous sulfate and pH adjustment, Hepure’s products support comprehensive arsenic remediation strategies.
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