A plasma spark discharge reactor for treating water. The plasma spark discharge reactor comprises a HV electrode with a head and ground electrode that surrounds at least a portion of the HV electrode. A passage for gas may pass through the reactor to a location proximate to the head to provide controlled formation of gas bubbles in order to facilitate the plasma spark discharge in a liquid environment.
STATEMENT OF GOVERNMENTAL INTEREST
 This invention was made with government support under contract no. DE-AC26-07NT42677 awarded by the Department of Energy. The government has certain rights in the invention.