3  EP 2 000 000 A1 4  cathode chamber, an outlet through which an efflu- ent depart the cathode chamber, a cathode electrode and an electrolyte permeable membrane, and wherein both the anode electrode and the cathode cham- ber are to be submersed into an anaerobic environment to generate electrical energy and wherein the anode elec- trode is in direct contact with the cathode chamber. [0011] In yet another aspect of the present invention a method is provided for obtaining bioenergy. The meth- od comprises the steps of: (i) submersing one or more anode electrode (s) and one or more cathode chamber (s), said cathode chamber comprising an inlet through which influent enters the cathode chamber, an outlet through which the effluent depart the cathode chamber, a cathode electrode and a electrolyte membrane and one or more combined electrodes into an anaerobic envi- ronment, (ii) permitting microorganisms in the anaerobic en- vironment to oxidize reduced organic or inorganic material thereby producing a plurality of electrons and (iii) obtaining a voltage between the one or more an- ode electrode (s) and the one or more cathode elec- trode (s) [0012] In still another aspect of the present invention the use of the MFC and the combined electrode accord- ing of the present invention for the generation of electrical energy is provided. [0013] Additional aspects of the present invention re- late to the use of the MFC and the combined electrode according to the present invention for bioremediation, for use as a biosensor and for producing bio- hydrogen. Figure 1 illustrate a schematic diagram of the MFC Figure 2 illustrate a schematic diagram of the cath- ode chamber shown in figure 1 Figure 3 illustrate a schematic diagram of the com- bined electrode Figure 4 illustrate a schematic diagram of the cath- ode chamber shown in figure 3 Figure 5 illustrate a situation wherein several MFC’s or combined electrodes are submersed into the same environment. [0014] Figure 6 illustrate voltage generation from the mod- ified wastewater containing acetate (1.6 g/L; SCOD = 1694  GLYPH<25> 20 mg/L) with a 470   resistor in the SMFC. No air flow to the cathode chamber between 5 and 12 hr. [0015] The present invention will now be described in more detail in the following. [0016] The inventors of the present invention surpris- ingly discovered and developed a new MFC construction that simultaneously complies with the low construction costs and applicability in both natural and artificial con- structed environments. GLYPH<3> [0017] The construction of the new MFC for the gen- eration of electrical energy comprises: (i) an anode elec- trode, (ii) a cathode chamber, said cathode chamber comprising an inlet through which an influent enters the cathode chamber, an outlet through which an effluent depart the cathode chamber, a cathode electrode and an electrolyte permeable membrane, wherein both the anode electrode and the cathode chamber are to be sub- mersed into an anaerobic environment to electrical en- ergy. [0018] In the present context the term "anode elec- trode" refers to an electrode capable of donating elec- trons, whereas the term "cathode electrode" in the present context refers to an electrode capable of accept- ing electrons. [0019] In the present context the term "cathode cham- ber" relates to a chamber providing an interior different from the environment surrounding the cathode chamber at least in respect of the oxidant content. [0020] In respect of the electrical energy generated by the new MFC, the yield of electrical energy generated may severely affect by the internal resistance voltage drop (IR voltage drop). High IR voltage drop between two electrodes is caused by physical and chemical compo- nents present in series in the MFC. Such physical and chemical components may be the distance between the anode electrode and the cathode electrode, the type of electrolyte and the cell configuration (i.e. the bridge for proton transfer of the two chambers). High IR voltage drop lead to a reduction in the yield of electrical energy generated and constitute a significant problem in the prior art MFC technology. The present invention provides a MFC and or a combined electrode capable of lowering the IR voltage drop and thus increasing the yield of elec- trical energy generated. [0021] In the present context the term "IR voltage drop" relates to the internal resistance occurring between the anode electrode and cathode electrode. [0022] Low IR voltage drop may be provided by the present invention by regulating the distance between the anode electrode and the cathode electrode. Dependent Brief description of the figures DETAILED DISCLOSURE OF THE PRESENT INVEN- TION 3