Effect of the number of inner wire electrodes on surfactant treatment using nanosecond pulsed powers

Surfactant treatment with nanosecond pulsed power system was performed in this study. In order to investigate the effectiveness of electric discharges, the number of inner wire electrodes in treatment device was either eight or two. The surfactant treatment using eight inner wire electrodes was faster than that using two inner wire electrodes because higher ozone concentration and more active species were obtained during pulse application. This could be caused by larger discharge area in using eight inner wire electrodes. Moreover, the surfactant treatment using nanosecond pulsed power system was compared with the treatment using an external ozonizer. The ozone concentration during treatment with an external ozonizer was higher than that with nanosecond pulsed power system. However, the height of foam using an external ozonizer decreased slower than that using nanosecond pulsed power system. It was suggested that direct effects of electric discharges promoted production of active species as OH radical and reactions between them and surfactants as an organic compound. The treatment device utilizing electric discharges was expected to for efficient treatment of water containing persistent substance.