Effects of Pulsed Power Control on Plasma Water Treatment Using LTD

Abstract

We have studied a water treatment by pulsed discharge plasma. To produce the plasma, pulsed high voltage is applied to an electrode. At previous studies, effects of peak, width, rise rate, and repetition rate of pulsed voltage have been confirmed. According to the studies, there is more loss at a latter part of a pulse. To reduce the loss, we investigated an effect of lowering the latter part of the pulse. In addition, an effect of periods between pulses was also investigated for optimization of pulse application timing. Those are new investigations, which were able to be carried out by various pulse forming technologies using a solid-state linear transformer driver. As the result, energy efficiency for organic compounds decomposition increased with a decrease of the latter part of pulses and with an increase of periods between pulses. A possible reason of that is the decrease of disappearance reactions of radicals owing to the decrease of those concentrations. Hence, short pulse and long periods realizes water purification of high-energy efficiency.