Ishak and Rowson (2009) showed that ultrasonic pre-treatment enhances the removal of heavy metals (namely, iron, zinc, and copper) from acid mine drainage when coupled with a flotation system.
U-Ishak noRowson (2009) bakhombisa ukuthi ukwelashwa kwangaphambi kwe-ultrasonic kuthuthukisa ukukhishwa kwezinsimbi ezisindayo (okungukuthi, i-iron, i-zinc, ne-zethusi) emgodini wokudonsa i-acid lapho kuhlanganiswa nohlelo lwe-flotation.