Some sorts of ultrasound can disintegrate biological cells including bacteria. This has uses in biological science and in killing bacteria in sewage. High power ultrasound at frequency of around 20 kHz produces cavitation that facilitates particle disintegration. Dr. Samir Khanal of Iowa State University employed high power ultrasound to disintegrate corn slurry to enhance liquefaction and saccharification for higher ethanol yield in dry corn milling plants.
See examples:-
- Ultrasound pre-treatment of waste activated sludge
- Retooling ethanol industries: integrating ultrasonics into dry corn milling to enhance ethanol yield
- Enhancement of anaerobic sludge digestion by ultrasonic disintegration
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