Scientists have discovered the there is potential to use sound waves as a technique for aggregating micro plastics to be removed from waterways. The sound waves move and vibrate the particles of plastic, causing them to accumulate in flowing water and making it more efficient to filter them out.

https://www.acs.org/pressroom/newsreleases/2023/march/pulsing-ultrasound-waves-could-someday-remove-microplastics-from-waterways-video.html