Control of foam during fermentation by the application of ultrasonic energy

Abstract

AbstractAn ultrasonic generator was tested at 3 frequencies for its effects on Serratia marcescens during fermentation. The generator controlled foam adequately at 26, 29, and 34 kc/sec at medium aeration rates up to 0·6 ft3/min. Final viable counts were in the same range as those for cultures grown using lard oil as a foam control agent. At 34 kc/sec the final viable counts were slightly higher than those of cultures with lard oil.No harmful effects were evident when large volumes of cultures were exposed to ultrasonic energy during growth.