PULSED POWER SUPPLY AND COAXIAL REACTOR APPLIED TO E. coli ELIMINATION IN WATER BY PDBD

The design and instrumentation intended for ATTC8739 Escherichia coli (E. coli) bacteria elimination in water, based on non thermal plasma generation at room pressure have been carried out by means of dielectric pulsed discharges. The latter have been produced by a power supply capable of providing voltages up to the order of 45 kV, 1-500 µs pulse widths and variable frequencies between 100 Hz to 2000 Hz. This supply feeds a coaxial discharge reactor of the simple dielectric barrier type. The adequate operation of the system has been tested with the elimination of E. coli at 10 4 and 10 6 bacteria/mL concentrations, leading to reductions up to 85.3 % and 95.1 %, respectively, during the first 30 min of treatment.