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Ljudvågor testas för nedbrytning av PFAS
Energy efficient PFAS degradation in waste water by hydrodynamic and acoustic cavitation. View original picture , opens in new tab/window

Sound waves are tested for degradation of PFAS

Published: 27 January 2021

Researchers in Waste Science and Technology at Luleå University of Technology are testing various techniques for the degradation of the toxic substance PFAS. Researchers within Engineering Acoustics investigates if hydrodynamic and acoustic cavitation can give an efficient degradation of PFAS.

When liquids are subjected to ultrasound, bubbles are created and collapsed, a phenomenon called cavitation. PFAS is an environmental toxin that can cause cancer and liver damage and is extremely difficult to degrade.

Örjan Johansson is a professor in Engineering Acoustics at Luleå University of Technology.
Örjan Johansson is a professor in Engineering Acoustics at Luleå University of Technology.

"The hypothesis is that PFAS-molecules are collected in micro bubbles in the water. By collapsing these cavitation bubbles with high-intensity ultrasound, an extreme pressure arises and the increase in temperature causes degradation and neutralization of the molecular chains", says Örjan Johansson, professor in Engineering Acoustics at Luleå University of Technology.

The challenge is to create an energy-efficient method that can be applied on an industrial scale. For best results, optimization of the flow conditions and the intensity and frequency content of the ultrasound is required, with respect to the substances to be treated..

Örjan Johansson

Örjan Johansson, Professor and Head of Subject

Phone: +46 (0)920 491386
Organisation: Engineering Acoustics, Operation, Maintenance and Acoustics, Department of Civil, Environmental and Natural Resources Engineering