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Enhanced adsorption of arsenic through the oxidative Treatment of Reduced Aquifer Solids
Citation:
Huling, J., Scott G. Huling, AND R. Ludwig. Enhanced adsorption of arsenic through the oxidative Treatment of Reduced Aquifer Solids. WATER RESEARCH. Elsevier Science Ltd, New York, NY, 123:183-191, (2017). https://doi.org/10.1016/j.watres.2017.06.064
Impact/Purpose:
Arsenic (As) contamination in drinking water is an epidemic in many areas of the world. Developing affordable and efficient procedures to remove arsenic from drinking water is critical to protect human health. In this study, the oxidation of aquifer solids through the use of sodium permanganate (NaMnO4), hydrogen peroxide (H2O2), and exposure to air, enhanced the adsorption of arsenic to the aquifer material. NaMnO4 was more effective than H2O2. NaMnO4 was tested at different loading rates (0.5, 1.5, 2.4, 3.4, and 4.9 g NaMnO4/kg aquifer material), and after 30-days contact time, arsenic removal ([As+3]INITIAL= 610 μg/L) was 77%, 88%, 93%, 95%, 97%, respectively, relative to unoxidized aquifer material. Arsenic removal increased with increasing contact time (30, 60, 90 days) suggesting removal was not reversible under the conditions of these experiments. Oxidative treatment by exposing the aquifer solids to air for 68 days resulted in >99% removal of Arsenic ([As+3]INITIAL= 550 μg/L). Less arsenic removal (38.2%) was measured in the un-oxidized aquifer material. In-situ oxidation of aquifer materials using NaMnO4, or ex-situ oxidation of aquifer materials through exposure to air could be effective in the removal of arsenic from ground water and a potential treatment method to protect human health.
Description:
Arsenic (As) contamination in drinking water is an epidemic in many areas of the world. Developing affordable and efficient procedures to remove arsenic from drinking water is critical to protect human health. In this study, the oxidation of aquifer solids through the use of sodium permanganate (NaMnO4), hydrogen peroxide (H2O2), and exposure to air, enhanced the adsorption of arsenic to the aquifer material. NaMnO4 was more effective than H2O2. NaMnO4 was tested at different loading rates (0.5, 1.5, 2.4, 3.4, and 4.9 g NaMnO4/kg aquifer material), and after 30-days contact time, arsenic removal ([As+3]INITIAL= 610 μg/L) was 77%, 88%, 93%, 95%, 97%, respectively, relative to unoxidized aquifer material. Arsenic removal increased with increasing contact time (30, 60, 90 days) suggesting removal was not reversible under the conditions of these experiments. Oxidative treatment by exposing the aquifer solids to air for 68 days resulted in >99% removal of Arsenic ([As+3]INITIAL= 550 μg/L). Less arsenic removal (38.2%) was measured in the un-oxidized aquifer material. In-situ oxidation of aquifer materials using NaMnO4, or ex-situ oxidation of aquifer materials through exposure to air could be effective in the removal of arsenic from ground water and a potential treatment method to protect human health.
URLs/Downloads:
DOI: Enhanced adsorption of arsenic through the oxidative Treatment of Reduced Aquifer Solids
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