Efficient PFAS removal from contaminated soils through combined washing and adsorption in soil effluents
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View abstract on PubMed
Summary
This summary is machine-generated.Methanol and cyclodextrin (HPCD) effectively remove over 95% of poly- and perfluoroalkyl substances (PFAS) from contaminated soil. Integrated soil washing and adsorption treatments offer a promising strategy for efficient PFAS remediation.
Area Of Science
- Environmental Chemistry
- Soil Science
- Remediation Technologies
Background
- Poly- and perfluoroalkyl substances (PFAS) are persistent environmental contaminants.
- Soil contamination by PFAS poses risks to ecosystems and human health.
- Effective remediation strategies for PFAS-contaminated soils are urgently needed.
Purpose Of The Study
- To evaluate soil washing as a remediation technique for PFAS-contaminated soils.
- To compare the efficacy of different washing agents, including water, methanol, ethanol, and cyclodextrin (HPCD).
- To optimize washing conditions and assess the subsequent treatment of wash effluents.
Main Methods
- Soil washing experiments using water, methanol (50% v/v), ethanol, and HPCD (10 mg g⁻¹ soil).
- Batch and column studies with varying liquid/solid (L/S) ratios and soil fractions.
- Application of a first-order decay model to predict PFAS breakthrough curves.
- Treatment of wash effluents using activated carbon and biochar.
Main Results
- Water removed only 30% of PFAS, while methanol and HPCD achieved >95% removal.
- HPCD demonstrated efficient PFAS mobilization even at lower concentrations (1 mg mL⁻¹) in column studies.
- Activated carbon and biochar effectively reduced PFAS concentrations in effluents below detection limits.
- PFAS removal efficiency depended on specific PFAS compound characteristics.
Conclusions
- Methanol and HPCD are highly effective washing agents for PFAS removal from soil.
- Integrated soil washing with subsequent adsorption offers a viable and optimized strategy for PFAS remediation.
- The study provides valuable insights for developing practical solutions for PFAS-contaminated sites.
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