Enhanced adsorption of arsenic through the oxidative treatment of reduced aquifer solids

WATER RESEARCH

卷:123

Article

Huling, Jenna R.¹  Huling, Scott G.²  Ludwig, Ralph² 

[1] Oklahoma State Univ, Dept Chem Engn, 423 Engn North, Stillwater, OK 74078 USA

[2] US EPA, Off Res & Dev, Natl Risk Management Res Lab, Robert S Kerr Environm Res Ctr, POB 1198, Ada, OK 74820 USA

关键词: Arsenic;    Treatment;    Permanganate;    Oxidation;    Ground water;   

DOI  :  10.1016/j.watres.2017.06.064

来源: Elsevier

【 摘 要 】

Arsenic (As) contamination in drinking water is an epidemic in many areas of the world, especially Eastern Asian countries. 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 resulting in treatment of the water. 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 mu g/L) was 77%, 88%, 93%, 95%, 97%, respectively, relative to un-oxidized 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 mu g/L). Less arsenic removal (38.2%) was measured in the unoxidized 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 in ground water and a potential treatment method to protect human health. Published by Elsevier Ltd.

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