The atmospheric pressure surface barrier discharge (APSBD) in air has been used in killing Escherichia coli. We have developed two
similar dielectric barrier discharge (DBD) structure types of nonthermal plasma jets (PJ) driven by 5 – 20 kHz audio-frequency power at
atmospheric pressure. At a flow rate of 200 L/h (argon), a stable, arc-free discharge was produced. At 1.5 cm from the nozzle, the gas
temperature was kept at 47 -C for PJ-1 source and 38 -C for PJ-2 source. Some research on sterilization has been carried out and results show
that such a plasma jet source as PJ-2 is very effective in the disruption of E. coli.