NOVELTY - Digestive gases from organic waste fermentation are treated to remove hydrogen sulfide and hydrogen chloride gases. Methane in gas is reacted with water vapor to form hydrogen and carbon monoxide (CO), and CO is transformed to carbon dioxide (CO2) and hydrogen. Residual CO is selectively oxidized to CO2. CO2 in gas is completely removed by alkaline absorption and amine absorption.    USE - The method is used for producing electrical energy from chemicals (by methane fermentation) from organic waste materials such as domestic organic waste sludge, stock-raising waste water and sewage sludge.    ADVANTAGE - High quality hydrogen content gas, suitable for fuel cells is obtained and electricity generation of fuel cell is enabled efficiently.    DETAILED DESCRIPTION - Organic waste is fermented to produce gas containing methane. The digestive gases (b) formed are treated, or reformed to obtain hydrogen containing gas (c), which in turn is used for electricity generation (C) in a fuel cell. The gas treatment process involves gas pre-processing (1) to remove acidic gases such as hydrogen sulfide and hydrochloric acid. Methane is reformed (2) to hydrogen and carbon monoxide (CO), by catalytic reaction with water vapor. Then CO is transformed (3) to hydrogen and carbon dioxide (CO2) by catalytic reaction with water vapor in a modifying process. The residual CO in the gas after modifying process, is removed by selective oxidation (4), by catalytic reaction with an oxygen content gas. The CO2 is absorbed (5) by contacting with water or an alkaline solution, and separated. Residual CO2 if any, is also removed by CO2-amine absorption process (6) by contacting with an amine solution. Finally, hot gas containing hydrogen, obtained after CO2-amine absorption, is supplied to fuel cell, and oxygen content gas is used as oxidizing agent in fuel cell.    An INDEPENDENT CLAIM is also included for fuel cell electricity generation system.    DESCRIPTION OF DRAWING(S) - The figure shows fuel cell electricity generation system. (The drawing includes non-English language text).    Methane fermentation process (A)    Gas treatment process (B)    Fuel cell electricity generation process (C)    Gas pre-processing (1)    Reforming process (2)    Transformation process (3)    Selective oxidation (4)    Carbon dioxide absorption (5, 6)    Digestive gas (b)    Hydrogen containing gas (c)