A laminar flow plasma reactor comprising: a housing (17, 18, 45) including a reactor chamber internal to the housing, a gas inlet port, at least one liquid inlet port and at least one liquid outlet port; characterized in that the laminar flow plasma reactor further comprises an electric field generator including a dielectrically isolated first electrode and a spaced apart second electrode is configured to generate an electric field therebetween, wherein the first electrode is dielectrically isolated by at least one dielectric element, which dielectric element is positioned between the first electrode and the second electrode; and an upper flow spreader configured to supply a stream of gas to the reactor chamber, the upper flow spreader positioned within the reactor chamber concentrically with the first electrode; and a lower flow spreader configured to supply a stream of liquid to the reactor chamber, the lower flow spreader positioned within the reactor chamber concentrically with the first and second electrodes and the upper flow spreader, whereby the stream of liquid and the stream of gas flow adjacent one another radially outward from the center of the reactor chamber and pass through the electric field; an alignment rod extending through the lower flow spreader, the dielectric element and the upper flow spreader; at least one liquid inlet port is configured to supply a liquid from an external pressurized liquid source; and a gas source configured to supply from the gas inlet port through the alignment rod a flow of gas to the reactor at an equal or higher pressure than the pressure in the reactor chamber, wherein the gas inlet in the alignment rod is coupled to an external pressurized gas source configured to supply the gas at a positive pressure relative to the liquid source pressure; wherein the first electrode and second electrode are configured to ionize the gas to create a plasma adjacent to the liquid when driven by an appropriate external electrical source. a housing (17, 18, 45) including a reactor chamber internal to the housing, a gas inlet port, at least one liquid inlet port and at least one liquid outlet port; characterized in that the laminar flow plasma reactor further comprises an electric field generator including a dielectrically isolated first electrode and a spaced apart second electrode is configured to generate an electric field therebetween, wherein the first electrode is dielectrically isolated by at least one dielectric element, which dielectric element is positioned between the first electrode and the second electrode; and an upper flow spreader configured to supply a stream of gas to the reactor chamber, the upper flow spreader positioned within the reactor chamber concentrically with the first electrode; and a lower flow spreader configured to supply a stream of liquid to the reactor chamber, the lower flow spreader positioned within the reactor chamber concentrically with the first and second electrodes and the upper flow spreader, whereby the stream of liquid and the stream of gas flow adjacent one another radially outward from the center of the reactor chamber and pass through the electric field; an alignment rod extending through the lower flow spreader, the dielectric element and the upper flow spreader; at least one liquid inlet port is configured to supply a liquid from an external pressurized liquid source; and a gas source configured to supply from the gas inlet port through the alignment rod a flow of gas to the reactor at an equal or higher pressure than the pressure in the reactor chamber, wherein the gas inlet in the alignment rod is coupled to an external pressurized gas source configured to supply the gas at a positive pressure relative to the liquid source pressure; wherein the first electrode and second electrode are configured to ionize the gas to create a plasma adjacent to the liquid when driven by an appropriate external electrical source.