Mechanisms of Biocidal Activity of Dielectric Barrier Discharge Air Jet with Misting

Abstract

Two nearly identical plasma jet-like systems with water misting were investigated for effective pathogen inactivation regimens on Escherichia coli in atmospheric conditions. Although the electrode construction is quite similar, we show that the concentration of active species generated at the exit of the discharge is quite different, and inactivation of bacteria by this treatment also varies. Inactivation and production rates of hydrogen peroxide, nitrate, and nitrite in liquid were higher when a single quartz barrier was utilized in the dielectric barrier discharge and one of the electrodes was open stainless steel.

White paper on the future of plasma science in environment, for gas conversion and agriculture

“…Plasma treatment of seeds can increase their germination rates and efficiencies and plasma can enhance plant growth. Seeds, food, and food processing tools can be protected from or decontaminated of fungi or bacteria . Furthermore, plasma chemistry may help to produce fertilizers or to enable sustainable material life cycles with its unique nonthermal character …”

High reactivity and bactericidal effects of plasma‐activated mist from hydrogen peroxide solution

“…The acidification of the mist is caused by the reactions of the RNS generated by the discharge with water to produce nitric and nitrous acids, as shown in reactions ( 22) and ( 24). [12,14] The conductivity is elevated to 770 and 1207 μS/cm for PAWM and PAHM, respectively, due to the accumulation of positive and negative ions in the mist during the discharge. The conductivity of PAHM is more significantly enhanced than PAWM, indicating a larger number of charged particles produced by PAHM.…”

“…The bactericidal results of F I G U R E 6 pH and conductivity under different conditions PAWM in this study are not as effective as reported in other literature. [7,12,36] In previous studies, the activated water is mixed directly with the bacterial solution to make full use of the active substances, which is not applicable for logistics sterilization. In this study, the PAWM ejected by the DBD nozzle does not penetrate all the way into the bacterial solution, partially spreading into the air.…”

Enhancing Shelf Life of Bananas by Using Atmospheric Pressure Pulsed Cold Plasma Treatment of the Storage Atmosphere

“…The mspDBD system previously described by the author, was used. 11,14 A hollow square was used to mount seven high-voltage electrodes and six ground electrodes at 45º relative to their cross-sectional centers, and ~ 1 mm away from each other as measured from their outer diameters (Figs. 1-3).…”

“…11 The design of the electrode grid was borrowed from 12,13 we applied pulses of 3 μs duration and 26 kV amplitude at 1000 Hz to a grid of wires in which the high-voltage and ground wires alternate and the high-voltage wire was supply limitations. 14 and sugar content) of bananas.…”