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.
School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia.
Water Res. 2024 Apr 1;253:121300. doi: 10.1016/j.watres.2024.121300. Epub 2024 Feb 9.
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.
垃圾填埋场是处理含有全氟和多氟烷基物质（PFAS）废物的主要终点，废物随后通过垃圾渗滤液将 PFAS 释放到周围环境中。臭氧气泡浮选分离技术作为一种有前途的 PFAS 去除技术应运而生。本研究旨在：（i）评估臭氧气泡浮选分离系统从垃圾渗滤液中去除 PFAS 的效果；（ii）量化 PFAS 在臭氧气泡气-水界面上的平衡吸附，然后与空气泡沫浮选进行比较。结果表明，臭氧气泡浮选分离技术对垃圾渗滤液中 PFAS 的去除非常有效，可去除超过 90%的长链 PFAS。所确定的操作条件为工业应用提供了有价值的见解，指导了优化臭氧流量（1 L/min）、投加量（43 mg/L）和最小化泡沫生成量（4%润湿度）。平衡模型表明，在相应的 PFAS 浓度下，空气气泡的表面过剩量比臭氧气泡高 20-40%。然而，臭氧气泡浮选分离技术仍能有效去除垃圾渗滤液中的 PFAS。值得注意的是，臭氧气泡浮选分离技术产生的泡沫生成量减少了 2-4 倍，从而为废物最终处置节省了大量成本，并减少了现场储存需求。
