TECHNOLOGY FOCUS - BIOLOGY - Preferred Process: The digestion is carried out by at least one type of anaerobic bacteria, preferably Thermoanaerobacterium.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Process: The heat generated is utilized to: heat the feedstock prior to subjecting it to the digestion; heat the feedstock; and heat other systems at the biological feedstock source facility. The produced methane is combined with hydrogen and the mixture is converted into electricity and heat, using a fuel cell and the mixture is combusted to power an electricity generator. The electricity generated is utilized to power the other processes at the biological feedstock source facility. The heat generated is utilized to heat the feedstock and digester. The feedstock is heated at 55 degrees C and 32 degrees C prior to being brought into contact with the thermophilic bacteria and with the mesophilic bacteria, respectively. The feedstock is heated at 12 degrees C prior to being brought into contact with the psychrophilic bacteria. The hydrogen produced is separated for further processing. The feedstock is passed through a filter and divided into streams for diversion to the best suited digester, biological and/or chemical. Preferred Components: The apparatus further comprises: an electricity generating unit, which is a fuel cell; a heat exchanger; a compressor for compressing hydrogen gas and/or methane; a scrubbing unit for collecting and separating out any carbon dioxide and/or hydrogen sulfide produced in the digestion unit; and a mixing unit for combining methane produced in the digestion unit with hydrogen produced in the halogen oxidation unit. EXAMPLE - A feedstock (brewers' spent grain) was fed into the anaerobic digester after applying the heat from the halogen electrolysis system to facilitate the initial warming for thermophilic digestion. Once the available heat transferred, additional heat was applied to the feedstock if desired from the halogen digestion process. The final temperature of the spent grain was 55 degrees C, which was generally the optimal temperature for thermophilic anaerobic digestion to produce methane. Once the grain was introduced into the anaerobic digester, diminished returns resulted from further retention of the feedstock. At this point, an estimated 45-60% of the organic solids had been consumed and the remaining energy in this effluent was harnessed by the halogen digestion process. The gas output was estimated as 34000 cubic feet of methane produced per day.