Abstract: An apparatus and method are for disinfection and purification of a liquid, gaseous or solid phase, or a mixture thereof. The apparatus includes: a central electrode, a dielectric layer adjacent to the electrode, a first area adjacent to the dielectric layer, and is configured to introduce a first medium into the first area, a second area adjacent to the first area. The apparatus is also configured to introduce a second medium into the second area, and for creating a plasma in the first medium, while the first medium is present in the first area, by applying a voltage between the first electrode and a second electrode. An injector injects the plasma into the second area, in order to be mixed with the second medium.

Abstract: A plasma jet apparatus for performing plasma processing of an article includes: an elongated central electrode (2,15), an elongated cylindrical outer electrode (1) or two outer electrodes (15,16) surrounding the central electrode and being coaxial with the central electrode, or two electrodes substantially parallel to the central electrode. an electrical insulator (3) or insulators (18,19) are disposed between the outer electrode(s) and the central electrode, wherein a discharge lumen having a distal end and a proximal end is defined between the central electrode and the electrical insulator(s). A supply opening (6) is disposed at the distal end of the discharge lumen for supplying a plasma producing gas to the discharge lumen, A power source (9) provides a voltage between the central electrode and said outer electrode. The electrical insulator has a radial or outward extension (40,20) at the proximal end beyond the outer surface of the outer electrode(s).