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ZERO-VALENT IRON PRB APPLICATION EXPANDS TO ARSENIC REMOVAL
Citation:
WILKIN, R. T., L. JACOBSON, AND E. COOMBE. ZERO-VALENT IRON PRB APPLICATION EXPANDS TO ARSENIC REMOVAL. IN: Technology News and Trends, U.S. Environmental Protection Agency, Washington, DC, (21):1-2, (2005).
Impact/Purpose:
News Letter Article
Description:
The U.S. EPA Office of Research and Development’s National Risk Management Research Laboratory (NRMRL) and Region 8 have begun evaluating performance of a pilot-scale permeable reactive barrier (PRB) to treat arsenic-contaminated ground water at the ASARCO Superfund near Helena, MT. High ground-water flow rates required the barrier design to involve wider and deeper dimensions than most PRBs currently in operation. Barrier construction also was challenged by the bulky composition of the site’s surface and subsurface, which required use of large excavation equipment. Preliminary results indicate that arsenic concentrations as high as 20 mg/L in ground water entering the PRB are reduced to concentrations below 10 µg/L within the barrier. Further concentration reductions are anticipated after construction impacts on the treatment system subside.
