NOVELTY - Cleansing fuel processing effluent containing carbonaceous compounds and inorganic salts, comprises contacting the fuel processing effluent with an anode of a microbial fuel cell. The anode comprises microbes on it which oxidatively degrades at least one of the carbonaceous compounds and produces electrical energy from the oxidative degradation which is directed to drive an electrosorption mechanism that operates to reduce the concentration of at least one inorganic salt in the fuel processing effluent.    USE - The method is useful for cleansing fuel processing effluent containing carbonaceous compounds and inorganic salts, where the effluent is water (claimed).    ADVANTAGE - The method is: amenable and convenient to operating on site; and is adapted as a mobile unit, thus eliminating the requirement for transporting waste to a treatment facility and enables processing waters to be safely discharged into the environment or re-used in a cost effective and environmentally friendly manner.    DETAILED DESCRIPTION - Cleansing fuel processing effluent containing carbonaceous compounds and inorganic salts, comprises contacting the fuel processing effluent with an anode of a microbial fuel cell. The anode comprises microbes on it which oxidatively degrades at least one of the carbonaceous compounds and produces electrical energy from the oxidative degradation which is directed to drive an electrosorption mechanism that operates to reduce the concentration of at least one inorganic salt in the fuel processing effluent. The anode is in electrical communication with a cathode of the microbial fuel cell and at least a portion of the carbonaceous compounds comprises at least one hydrocarbon compound. An INDEPENDENT CLAIM is also included for a device for cleansing fuel processing water, comprising a microbial fuel cell electrically connected to an electrosorption device, so that the electrical power generated by the microbial fuel cell is capable of operating the electrosorption device.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram showing microbial fuel cell-electrosorption treatment process.