5  EP 2 000 000 A1 6  on the operational conditions the distance between the anode electrode and the cathode chamber may be 5 cm or less, such as 4 cm or less, e.g. 3 cm or less, such as 2 cm or less, e.g. 1 cm or less. [0023] In an embodiment of the present invention the cathode chamber may be either fully or partly surrounded by the anode electrode. Thus, it may be preferred that at the most 90% of the cathode chamber is surrounded by the anode electrode, such as at the most 80 %, e.g. at the most 70%, such as at the most 60 %, e.g. at the most 50%, such as at the most 40 %, e.g. at the most 30%, such as at the most 20 %, e.g. at the most 10%, such as in the range of 10-60%, e.g. in the range of 20-80%, such as in the range of 30-70%, e.g. in the range of 40-50%. In the present context the term "fully surrounded" relates to a cathode chamber, wherein the cathode chamber at all sides is facing the anode electrode. This aspect also applies for a cathode chamber comprising various geo- metrical shapes. [0024] In yet an embodiment of the present invention, only one side of the cathode chamber may be facing the anode electrode. In the present invention the term "fac- ing" refers to a position wherein the anode electrode and the cathode chamber is positioned front on as shown in figure 1. [0025] In the present context the term "influent" refers to a gas, liquid or combination hereof flowing in or into the cathode chamber. In a preferred embodiment of the present invention the influent may be an oxidant in the form of either gas, liquid or a combination hereof. The gas oxidant may be selected from the group consisting of air, oxygen, methane, ethane, other vapour gasses or any other gas- type oxidants whereas the liquid oxidant may be air saturated water or ferricyanide solution. [0026] In the present context term "effluent" refers to a gas, liquid or combination hereof flowing out or forth the cathode chamber. In a preferred embodiment of the invention the effluent may comprise water and air, ferri- cyanide and ferricyanide chemicals or any other redox couples. In the present context the term "redox couples" relates to couples of oxidising and reducing agents, wherein an oxidising agent is an agent that gain electrons and wherein a reducing agent is a reagent that undergoes a loss of electrons. [0027] The cathode chamber as described above may comprise a cathode electrode, said cathode electrode being capable of accepting electrons. [0028] In an embodiment of the present invention it may be preferred that the cathode chamber may be either partially or fully constructed in a sandwich type of way wherein the cathode electrode may ben contact with one side of the electrolyte permeable membrane by substan- tially fully overlapping or by partial overlapping the elec- trolyte membrane as illustrated in figure 2. [0029] In an embodiment of the present invention the cathode electrode is overlapping the electrolyte mem- brane by at least 5%, such as at least 10%, e.g. at least 25%, such as at least 50%, e.g. at least 75%, such as at least 80%, e.g. at least 90%, such as at least 95%. [0030] In the present context the term "substantially fully overlapping" relates to a separate cathode electrode and a separate electrolyte membrane being placed on top of one another. GLYPH<3> [0031] In the present context the term "partial overlap- ping" relates to a separate cathode electrode and a sep- arate electrolyte membrane being overlapping with only one part of either the cathode electrode or the electrolyte membrane. [0032] A partial overlap of 100% relates to full overlap and a deviation of 5% from the 100% full overlap relates to substantially full overlap. [0033] In yet an embodiment of the present invention the cathode electrode and the electrolyte permeable membrane are laying adjacent to one another. This means that the cathode electrode and the electrolyte per- meable membrane are placed in contact with each other (touching each other). An overlap of 0% (but in contact) relates to the term "laying adjacent", furthermore, an overlap of less than 5% may be considered being within the term of "laying adjacent", such as an overlap of at the most 4%, e.g. an overlap of the most 3%, such as an overlap of the most 2% or e.g. an overlap of the most 1%. In yet an embodiment of the present invention one side of the electrolyte permeable membrane is in contact with the cathode electrode. [0034] In yet an embodiment of the present invention the cathode electrode and the electrode permeable membrane may be pressed together by hot pressing or other pressing methods known to a person skilled in the art. [0035] It is be preferred that the various surfaces of the cathode chamber of the present invention may com- prise various geometrical shapes , thus in a preferred embodiment of the present invention the geometrical shapes may be selected from the group consisting of polygon, triangle, parallelogram, penrose tile, rectangle, rhombus, square, trapezium, quadrilateral, polydrafter, annulus, arbelos, circle, circular sector, circular segment, crescent, lune, oval, Reuleaux polygon, rotor, sphere, salinon, semicircle, triquetra Yin- Yang or a combination hereof. [0036] It is preferred that the cathode chamber may comprise the shape of a cube, a cylinder, a rectangular prism, a sphere, a ellipsoid, a pyramid, a cone or other volume formulations [0037] The materials selected to be used as an anode electrode may be an insoluble electron acceptor. The Cathode chamber Anode electrode Influent & effluent 4