Abstract
This article describes the design, construction and operation of an experimental facility to produce pulsed high-current underwater discharges for inactivation of bacteria. Pulsed high-pressure shock waves were produced in a sub-microsecond time scale. Measurements using a piezoelectric probe showed pressures ranging from 80 to 100 MPa. Applying a capacitor energy of 800 J, up to 7.5 log reduction was observed for E. coli after application of five pulses. Four to 5 log reductions were observed for Staphylococcus aureus and Lactic acid bacteria as well as Saccharomyces cerevisiae populations, using same conditions. An increase in the number of applied shock wave pulses resulted in a nearly exponential reduction in the population of the above microorganisms.
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