The effectiveness of ultrasound for inactivation of Escherichia coli and coliphages was
quantified in this study. The results showed that sonication alone could inactivate E. coli, especially with
long sonication times. A high power to volume ratio (900 W/L) provided better inactivation than
a low ratio (180 W/L). Increases in turbidity and temperature were observed after application of
sonication. Ultrasound provided a synergistic effect for E. coli inactivation when simultaneously
applied with chlorination. No synergy was observed for sequential application of sonication and
chlorination. Includes 4 references, tables, figures.