System and method for plasma discharge in liquid

A system for generating a plasma discharge in liquid, the system comprising:

• a liquid inlet and a liquid outlet in fluid communication with an interior reactor space of a cylindrical liquid vessel having a central axis, the inlet and outlet both disposed near a top side of the liquid vessel and configured to generate a vortex liquid flow in the interior space of the liquid vessel;
• and
• a high voltage electrode and a ground electrode spaced apart, the high voltage electrode disposed coaxially with the central axis of the cylindrical liquid vessel at a bottom side of the liquid vessel, and including a central solid cylindrical rod inserted at least partially into and coaxial with a cylindrically-symmetric electrode housing, the electrode housing including a gas channel disposed tangentially to the central solid rod along an interior wall of the electrode housing for gas injection into an interior electrode housing space of the electrode housing, the gas channel configured to generate a vortex gas flow within the interior electrode housing space around the central solid cylindrical rod.