Molecular-scale characterization of groundwater treatment sludge from around the world: Implications for potential arsenic recovery
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mg As/kg (dry weight) and the phosphorous (P) content reached ~0.5–2 mass%. Notably, our results indicated that the influent As level was a poor predictor of the As sludge content, with the highest As mass fractions (940–1200 mg As/kg) measured in sludge generated from treating low groundwater As levels (1.1–22 μg/L). The Fe K-edge XAS data revealed that all samples consisted of nanoscale Fe(III) precipitates with less structural order than ferrihydrite, which is consistent with their high BET surface area (up to >250 m2/g) and large As and P mass
fractions. The As K-edge XAS data indicated As was present in all samples predominantly as As(V) bound to Fe(III) precipitates in the binuclear-corner sharing (2C) geometry. Overall, the similar structure and composition of
all samples implies that As recovery methods optimized for one type of Fe-based treatment sludge can be applied to many groundwater treatment sludges. Our work provides a critical foundation for further research to develop
resource recovery methods for As-rich waste.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 120561 |
Tidsskrift | Water Research |
Vol/bind | 245 |
Antal sider | 10 |
ISSN | 0043-1354 |
DOI | |
Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
This work was supported by a Start-up Grant from GeoCenter Denmark and by a Project1 Grant (Thematic Research for the Green Transition) from the Independent Research Fund Denmark (project no. 1127-00207B). We gratefully acknowledge the useful comments provided by an anonymous reviewer during peer review that improved this work. Ryan Davis at SSRL and Kajsa Sigfridsson Clauss at MAX IV are thanked for support during XAS data collection. Use of SSRL, SLAC National Accelerator Laboratory, was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. DE-AC02-76SF00515. We acknowledge MAX IV Laboratory for time on the Balder beam line under Proposal 20221096. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496.
Funding Information:
This work was supported by a Start-up Grant from GeoCenter Denmark and by a Project1 Grant (Thematic Research for the Green Transition) from the Independent Research Fund Denmark (project no. 1127-00207B). We gratefully acknowledge the useful comments provided by an anonymous reviewer during peer review that improved this work. Ryan Davis at SSRL and Kajsa Sigfridsson Clauss at MAX IV are thanked for support during XAS data collection. Use of SSRL, SLAC National Accelerator Laboratory, was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. DE-AC02-76SF00515. We acknowledge MAX IV Laboratory for time on the Balder beam line under Proposal 20221096. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496.
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