| Summary: | This paper presents results on electric discharge
generation by high frequency high voltage (15–100 kHz)
in NaCl solutions with different initial conductivity
(100–1300 mS cm-1), and compares them with DC discharge
in the same electrode configuration. A batch plasma reactor
in the pin-hole configuration contained a ceramic dielectric
barrier separating two planar stainless steel electrodes;
barrier thickness of 0.6 mm and pin-hole diameter of
0.6 mm was used. Lissajous charts were evaluated from
electric measurements for different discharge phases
(electrolysis, bubble formation and discharge regular
operation). Breakdown moments for different solution
conductivities were determined from discharge power
evaluation as a function of applied frequency. Breakdown
voltage amplitude was decreased by the increasing
conductivity in both regimes while frequency and current
decreased. Changes of physical parameters (temperature,
solution conductivity and pH) as well as production of
hydrogen peroxide at different solution conductivities were
compared. Solution conductivity was increased in both
discharge regimes and with the initial conductivity value.
Solution temperature was increased by the discharge in
both regimes and with the increasing initial conductivity,
too. Solution pH dropped to acidic conditions when HF or
DC positive regime was applied while it was enhanced by
DC negative regime.
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