Arsenic removal from natural groundwater using 'green rust': Solid phase stability and contaminant fate
| Autor: | Liane G. Benning, Niels D. Overheu, Adrian Alexander Schiefler, Sandra Navaz Rubio, Jeffrey Paulo H. Perez, Markus Reischer, Dominique J. Tobler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Iron (oxyhydr)oxides Health Toxicology and Mutagenesis Groundwater remediation 0211 other engineering and technologies Mineral stability chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Environmental Chemistry Sulfate Waste Management and Disposal Dissolution Arsenic 0105 earth and related environmental sciences Magnetite 021110 strategic defence & security studies Aging effects Contamination Pollution Anoxic waters chemistry 13. Climate action Environmental chemistry Adsorption Adsorption Aging effects Groundwater remediation Iron (oxyhydr)oxides Mineral stability Groundwater |
| Zdroj: | Journal of Hazardous Materials Perez, J P H, Schiefler, A A, Rubio, S N, Reischer, M, Overheu, N D, Benning, L G & Tobler, D J 2021, ' Arsenic removal from natural groundwater using ‘green rust’ : Solid phase stability and contaminant fate ', Journal of Hazardous Materials, vol. 401, 123327 . https://doi.org/10.1016/j.jhazmat.2020.123327 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2020.123327 |
| Popis: | Arsenic (As) contamination in groundwater remains a pressing global challenge. In this study, we evaluated the potential of green rust (GR), a redox-active iron phase frequently occurring in anoxic environments, to treat As contamination at a former wood preservation site. We performed long-term batch experiments by exposing synthetic GR sulfate (GRSO4) to As-free and As-spiked (6 mg L−1) natural groundwater at both 25 and 4 °C. At 25 °C, GRSO4was metastable in As-free groundwater and transformed to GRCO3, and then fully to magnetite within 120 days; however, GRSO4stability increased 7-fold by lowering the temperature to 4 °C, and 8-fold by adding As to the groundwater at 25 °C. Highest GRSO4stability was observed when As was added to the groundwater at 4 °C. This stabilizing effect is explained by GR solubility being lowered by adsorbed As and/or lower temperatures, inhibiting partial GR dissolution required for transformation to GRCO3, and ultimately to magnetite. Despite these mineral transformations, all added As was removed from As-spiked samples within 120 days at 25 °C, while uptake was 2 times slower at 4 °C. Overall, we have successfully documented that GR is an important mineral substrate for As immobilization in anoxic subsurface environments. |
| Databáze: | OpenAIRE |
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