Electrical investigation of a pin-to-plane dielectric barrier discharge in contact with water

Abstract

Numerous investigations on plasma-liquid interaction have been published in the literature using various reactor geometries. However, our understanding of the basic configuration of a pin-to-plane dielectric barrier discharge (DBD) in contact with water is still incomplete. We therefore performed the electrical diagnostics of such a discharge, operated in a.c. regime with sinusoidal high voltage, focusing mainly on the power injected into the plasma in relation with several experimental parameters. It was found that the injected power increased linearly with the amplitude of the applied voltage, while without water the evolution followed a second-order polynomial. In both cases, the discharge power was proportional approximately with the frequency. For the DBD above water, the power was about three times greater than that without water, for the same air gap. It was observed that changing the discharge gap from 1 to 5 mm led to a slight increase in power, by only 15%. The water conductivity also influenced the power injected into the plasma only to a small extent. Thus, the variation in water conductivity over four orders of magnitude determined a fluctuation in discharge power of ±20%. I.

Removal of a mixture of antibiotics in water using nonthermal plasma

“…Other authors obtained almond‐shaped Lissajous due to the expansion of the plasma with a surface DBD [ 30 ] or in the presence of water. [ 31 ] The bottom part, that is, HV from –13 kV to about 5 kV is the waiting time for the strong discharge after reaching the voltage threshold. The first increase of Q m corresponds to the strong discharge period; the change of slope of Q m increase indicates the weak discharge period.…”

Pulsed corona discharge: an advanced treatment method for antibiotic-contaminated water

“…Generally, however, gas phase discharges in contact with liquid are less influenced by the conductivity as compared to underwater discharges. It was proved that the power dissipated in a corona discharge above water remains approximately constant when varying the liquid conductivity over four orders of magnitude (2 µS cm −1 -30 mS cm −1 ) [42]. As another example, the results obtained in [40] show only a few percent decrease of decolorization efficiency with rising conductivity by more than two orders of magnitude, from 17.4 µS cm −1 to 5.53 mS cm −1 .…”

Insights into the mechanisms of plasma physicochemical characteristics on ultralong-lasting plasma-activated water: the influence of DC power polarity on RONS generation

“…17 Recent studies have highlighted the significance of various process parameters, especially power polarity, in regulating RONS and pH value. [18][19][20][21][22][23][24][25][26][27][28] However, the impact of power polarity on the preparation method of ultralong-lasting PAW, including key long-lived RONS content and plasma characteristics, remains poorly understood.…”