16]FIG. 7B is a plan view of a surface discharge electrode used in the reactor shown in FIG. 7A. [0017]FIG. 8 is a side view of a non-thermal plasma reactor in which the liquid is sprayed into the reaction volume, according to another alternative embodiment of the present invention. [0018]FIG. 9 illustrates a non-thermal plasma reactor having a set of barriers used to increased back pressure withi