Foam fractionation of PFAS from landfill leachate using a membrane electrochemical reactor
Copyright © 2025 Elsevier Ltd. All rights reserved.
| Publié dans: | Waste management (New York, N.Y.). - 1999. - 208(2025) vom: 25. Okt., Seite 115154 |
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| Auteur principal: | |
| Autres auteurs: | , , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2025
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| Accès à la collection: | Waste management (New York, N.Y.) |
| Sujets: | Journal Article Chain length Electrochemical degradation Forever chemicals Leachate concentrate Settled solids Surfactant property Water Pollutants, Chemical Fluorocarbons perfluorosulfonic acid plus... |
| Résumé: | Copyright © 2025 Elsevier Ltd. All rights reserved. The effective removal of PFAS from chemically complex landfill leachate remains a significant challenge for the solid waste industry. To address this, a membrane electrochemical reactor (MER) was investigated for PFAS removal from landfill leachate at low pH (∼2.0) in the anode chamber. The MER achieved 95.6 % PFAS removal from landfill leachate within seven hours of operation, with 98.3 % of perfluorosulfonic acids (PFSA) and 85.5 % of perfluorocarboxylic acids (PFCA) removed from the leachate. Short-chain PFSAs (C ≤ 6, 92.5-99.1 %) were removed more efficiently than PFCAs (C ≤ 6, 80.8-90 %), possibly due to their stronger affinity for the air-water interface, which enhanced foam-based separation. Long-chain PFAS (C > 6) showed near-complete removal (96.1-100 %). Importantly, PFAS precursors such as fluorotelomer carboxylic acids and perfluoroalkane sulfonyl fluorides were not detected in defoamed leachate, suggesting their removal through both oxidative transformation and foam-phase partitioning in the MER. Simple pH adjustment to 2.0 using concentrated H2SO4, conducted for comparison with the MER, resulted in 83.1 % of PFAS separation into foam and 11.3 % into settled solids. Additionally, short-chain PFAS were separated into foam (59.2-84.7 %) and settled solids (5.7-13 %), while long-chain PFAS showed similar trends with 78.3-86 % in foam and 5.3-18.2 % in settled solids. The addition of 0.1 M NaHCO3 before pH adjustment enhanced foam formation, increasing PFAS separation in foam to 92.5 %. This study highlights MER's effective PFAS removal performance without any solid precipitate generation. Further research should explore the effect of MER operational conditions and leachate-PFAS chemistry on the treatment performance |
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| Description: | Date Completed 15.10.2025 Date Revised 15.10.2025 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2025.115154 |