Spectroscopic measurements of discharges inside bubbles in water

In the present research, a new method for a water treatment utilizing the discharge of bubbles in water is proposed. The radicals with short lifetime can be effective for water purification because the discharge is expected to occur inside the bubbles in water. Magnetic-pulse-compression pulsed-power generator was used as a repetitive power supply. The bubbles generated by a bubbling tube were passed through a discharge region between the electrodes. In this phase of the experiment, argon was used as a bubbling gas. The experimental results showed that a discharge was generated inside the bubbles in water by the mentioned pulsed-power generator. Simultaneously, measurements of the excited OH radical emission were carried out using a spectroscopic technique. The repetition rate of pulsed-power generator, the peak value of applied voltage and the gap length were 100 pps (pulse per second), 20 kV and 7.5 mm, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.