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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
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
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