Fate and removal of per- and polyfluoroalkyl substances throughout landfill leachate treatment processes Uncovering precursor transformation and sludge-mediated reappearance

Fate and removal of per- and polyfluoroalkyl substances throughout landfill leachate treatment processes : Uncovering precursor transformation and sludge-mediated reappearance

Copyright © 2025 Elsevier Ltd. All rights reserved.

Détails bibliographiques
Publié dans:Waste management (New York, N.Y.). - 1999. - 206(2025) vom: 30. Sept., Seite 115050
Auteur principal: Chen, Liping (Auteur)
Autres auteurs: Yu, Xia, Cai, Lankun, Sui, Qian
Format: Article en ligne
Langue:English
Publié: 2025
Accès à la collection:Waste management (New York, N.Y.)
Sujets:Journal Article Landfill leachate Mass flow Per- and polyfluoroalkyl substances (PFAS) Precursor transformation Removal efficiency Fluorocarbons Water Pollutants, Chemical perfluorooctanoic acid 947VD76D3L plus... Caprylates perfluorobutanesulfonic acid Sulfonic Acids
Description
Résumé:Copyright © 2025 Elsevier Ltd. All rights reserved.
Per- and polyfluoroalkyl substances (PFAS) in municipal solid waste (MSW) landfill leachate have emerged as a critical research focus because of their substantial environmental and health risks. However, the fate and transformation of PFAS across different treatment processes, particularly within specific techniques such as biotreatment, remains understudied in current research. This study systematically investigated the occurrence, fate, and removal of PFAS in a full-scale MSW landfill leachate treatment system in Shanghai, China. Thirty-two PFAS were analyzed in the raw leachate and the whole treatment process, including the equalization tank, the membrane bioreactor (MBR) system, and the nanofiltration (NF) process. Results showed that perfluorooctanoic acid (PFOA) and perfluorobutanesulfonic acid (PFBS) were the predominant compounds in both the raw leachate and effluents. The MBR process exhibited negative removal efficiencies for short-chain PFAS (-187.4 % to -103.5 %), indicating substantial precursor transformation, while NF achieved effective removal (42.1 % to 95.6 %). Solid phases of the sludge samples accumulated long-chain PFAS (log Kd up to 4.4), acting as significant secondary sources. Mass flow analysis revealed that denitrification processes increased the absolute daily load of PFOA (calculated as concentration × flow rate) by 4286 %, with the total oxidizable precursor (TOP) assays demonstrating thefluorotelomer-based precursors were the major contributors to perfluoroalkyl carboxylic acids (PFCAs) formation. The findings provide essential insights for developing more effective leachate treatment strategies and sludge management approaches to mitigate PFAS environmental release from MSW landfills
Description:Date Completed 26.09.2025
Date Revised 26.09.2025
published: Print-Electronic
Citation Status MEDLINE
ISSN:1879-2456
DOI:10.1016/j.wasman.2025.115050