Diaphragm Discharge in Liquids: Fundamentals and Applications

journal article - other

English

Paper describes results of our research on DC diaphragm discharge creation in water solutions of electrolytes from the viewpoint of its principles, properties and applications. The thermal theory of discharge ignition in bubbles of evaporated solution has been confirmed by both high speed camera and sound records. Static current-voltage characteristics revealed a significant dependence of discharge breakdown on the solution conductivity. Determined breakdown parameters lay in the range of 900-1300 V and 40-100 mA, respectively, for NaCl solution conductivity varying from 150 to 1300 microS/cm. Time resolved electrical characteristics showed a simultaneous appearance of current, voltage and sound oscillations as well as a light emission. Plasma diagnostics by optical emission spectroscopy confirmed formation of reactive species (hydroxyl, hydrogen and oxygen radicals) and excitation of metallic atoms presented in the solution. Moreover, rotational temperature was calculated from the obtained OH spectrum. Experiments focused on the diaphragm discharge applications are outlined in the paper. Results of hydrogen peroxide production, organic dye decomposition and treatment of humic acid solutions are compared from the viewpoint of experimental conditions.

Diaphragm discharge, electric characteristics, organic compounds destruction, discharge breakdown

KRČMA, F.; KOZÁKOVÁ, Z.; PROCHÁZKOVÁ, J.

2010

9. 8. 2010

1742-6596

Journal of Physics: Conference Series

207

1

United Kingdom of Great Britain and Northern Ireland

012010-1

012010-6

6