NOVELTY - Producing hydrogen from anaerobically digested organic materials involves: (1) placing the materials in a reaction zone; (2) applying an electric potential occasionally across the materials; and (3) optionally separating the carbon dioxide and hydrogen by a separation device.    USE - For the production of hydrogen from anaerobically digested organic materials (claimed) useful in the production of fertilizers, dyes, drugs, plastics, hydrogenated oils, fats, methanol and is used in many industries, in rocket fuels and as a minus-emission fuel which allows ordinary engines to clean the air.    ADVANTAGE - The time required to reduce the amount of organic material is reduced compared to the time required without application of the electric potential. The application of the electric potential maximizes the quantity of hydrogen produced per the amount of electricity consumed.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (a) an energy conversion process involves anaerobically digesting organic materials to produce carbon dioxide and fuel (selected from hydrogen and/or methane) and separating the carbon dioxide from the fuel. The separation involves pressurizing a fluid to provide preferential absorption of carbon dioxide, mixing the carbon dioxide and the fuel with the fluid, collecting the hydrogen which remains after the preferential absorption of carbon dioxide, heating the fluid after the preferential absorption of carbon dioxide for increasing the amount of work produced by a motor which expands the pressurized fluid, releasing the carbon dioxide in conjunction with the expanding process, and cooling the fluid before the pressurizing step; and    (b) conversion of biomass wastes into energy involving applying intermittent voltage for either depression of microorganismal activity which produces methane, enhancement of microorganismal activity which produces hydrogen, or creation of an atmosphere within the biomass wastes which is maintained rich in hydrogen.