PFAS removal from landfill leachate by ozone foam fractionation: System optimization and adsorption quantification.

Autor: Vo PHN; Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, Queensland, 4102, Australia; Climate Change Cluster, Faculty of Science, University of Technology Sydney, 15 Broadway, Ultimo, NSW, 2007, Australia. Electronic address: phong.vo@uts.edu.au., Nguyen TTP; School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia., Nguyen HTM; Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, Queensland, 4102, Australia., Baulch J; Evocra Pty Ltd, Brisbane, Australia., Dong S; Evocra Pty Ltd, Brisbane, Australia., Nguyen CV; Department of Water and Environmental Regulation, Joondalup, WA, 6027, Australia., Thai PK; Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, Queensland, 4102, Australia., Nguyen AV; School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Apr 01; Vol. 253, pp. 121300. Date of Electronic Publication: 2024 Feb 09.
DOI: 10.1016/j.watres.2024.121300
Abstrakt: Landfills are the primary endpoint for the disposal of PFAS-laden waste, which subsequently releases PFAS to the surrounding environments through landfill leachate. Ozone foam fractionation emerges as a promising technology for PFAS removal to address the issue. This study aims to (i) assess the effectiveness of the ozone foam fractionation system to remove PFAS from landfill leachate, and (ii) quantify equilibrium PFAS adsorption onto the gas-water interface of ozone bubbles, followed by a comparison with air foam fractionation. The results show that ozone foam fractionation is effective for PFAS removal from landfill leachate, with more than 90 % long-chain PFAS removed. The identified operating conditions provide valuable insights for industrial applications, guiding the optimization of ozone flow rates (1 L/min), dosing (43 mg/L) and minimizing foamate production (4 % wettability). The equilibrium modelling reveals that the surface excess of air bubbles exceeds that of ozone bubbles by 20-40 % at a corresponding PFAS concentration. However, the overall removal of PFAS from landfill leachate by ozone foam fractionation remains substantial. Notably, ozone foam fractionation generates foamate volumes 2 - 4 times less, resulting in significant cost savings for the final disposal of waste products and reduced site storage requirements.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Justin Baulch and Simon Dong report a relationship with Evocra Pty Ltd that includes: employment.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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