In most of the previous studies [8], [9], a point-to-plate
electrode configuration was usually adopted to generate underwater
electrical discharges because it is easy to establish a
sufficiently high localized electrical field (on the order of
megavolts per centimeter) near the point electrode. However,
the discharge in the point-to-plate electrode configuration is
limited in a small region near the point electrode, being difficult
to treat large amount of wastewater. To overcome the technical
handicap of the point-to-plate electrode configuration, various
types of electrode system capable of generating large-volume
underwater electrical streamer discharges have been proposed
[10]–[15]. It is important for reactor design to assess the effect
of the electrode configuration on the wastewater treatment by
underwater electrical streamer discharge