U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

REACTIVE TRANSPORT MODELING FOR MOBILIZATION OF ARSENIC IN A SEDIMENT DOWNGRADIENT FROM AN IRON PERMEABLE REACTIVE BARRIER
Jeen, S.-W.
Water 9(11):890(2017)

Arsenic (As) naturally present in native aquifer materials can be released to groundwater through reduction dissolution of As-containing iron oxides. While granular iron permeable reactive barriers (PRBs) can be effective for As treatment in groundwater, As mobilization in sediment downgradient of the PRB is a potential issue due to the reduced geochemical conditions generated by reactions in the PRB. Release of As from sediment downgradient of a proposed iron PRB was studied in lab column experiments, which showed significant As removal from the groundwater by granular iron (from the influent concentration of ~0.7 mg/L to <0.006 mg/L at the effluent); however, the study also showed that arsenic can be flushed from the aquifer sediments (up to 0.09 mg/L). Reactive transport modeling based on the geochemical reactions as suggested from the experiments (i.e., reductive dissolution of As-bearing goethite) successfully reproduced the geochemical trends observed in the column experiments. http://www.mdpi.com/2073-4441/9/11/890/pdf



The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.