NOVELTY - The method comprises placing a bio-battery for anaerobic biological degradation of an organic effluent (30) by contacting an anode (40) and a flexible bacterial support to consortium bacteria whose metabolism is based on sulfur fixation. The method further comprises: immersing the anode in the effluent, where the anode is juxtaposed with a mounting support of the microorganisms with microbial metabolism using sulfur as an electron acceptor molecules generating hydrogen to oxidize the sulfide at the anode for producing cations; and contacting the microorganisms with a bacterial support.    USE - The method is useful for bioelectrochemically treating an organic effluent such as pig manure using a bio-battery that is useful for generating electricity and for bioremediation of the organic effluent (all claimed).    ADVANTAGE - The method is capable of bioelectrochemically treating the organic effluent in a simple and cost-effective manner.    DETAILED DESCRIPTION - The method comprises placing a bio-battery for anaerobic biological degradation of an organic effluent (30) by contacting an anode (40) and a flexible bacterial support to consortium bacteria whose metabolism is based on sulfur fixation. The method further comprises: immersing the anode in the organic effluent, where the anode is juxtaposed with a mounting support of the microorganisms having microbial metabolism using sulfur as an electron acceptor molecules generating hydrogen to oxidize the sulfide at the anode for producing cations; contacting the microorganisms with a bacterial support juxtaposed to the anode; and immersing a cathode compartment (70) in the effluent organic, where the cathode compartment: comprises a cathode (80) and an electrolyte circulating oxidant; is in electrical connection with the anode through an external circuit; and separates the anode by a membrane (60) permeable to cations that are transferred from the anode to the cathode compartment through the membrane. The generated electrons flow to the anode to the cathode via the external circuit causing a lower biological and chemical oxygen demand of the effluent when compared to the input. The stages of level of microorganisms at the anode and at the cathode are given as in the specification. The anaerobic microorganisms include sulfur reducing bacteria. The microorganisms are present in a latent state in the effluent. The microorganisms are inoculated into the organic effluent or bacterial medium. The method has an operating temperature of 15-35 degrees C. The organic effluent is controlled at a pH of 6.5-8 and a redox potential of below -150 mV, referenced from a silver/silver chloride probe to favor development of the consortium of microorganisms in the latent state in the effluent. The microorganisms colonize the bacterial support. The reaction at the cathode is managed by an electrolyte consisting of a concentration of about 0.03 M of hydrogen peroxide circulated by a recirculation circuit and maintained at a pH of about 2.2 with an acid. INDEPENDENT CLAIMS are included for:    (1) a bio-battery;    (2) an anode;    (3) an anodic system;    (4) a cathode;    (5) a method for manufacturing a cathode; and    (6) a bioelectrochemical system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a bio-battery immersed in a single compartment (Drawing includes non-English language text).    Organic effluent (30)    Anode (40)    Cations permeable membrane (60)    Cathode compartment (70)    Cathode. (80)