NOVELTY - The organic waste (1) is pre-processed and gasified to form a combustible gas. The dust in gas is then removed by cleaning process. The ammonia contained in waste water generated during pre-processing of organic waste, and waste water generated in cleaning process of gas, is recovered. The recovered ammonia is decomposed into hydrogen and nitrogen using a decomposition catalyst (7). Thus, hydrogen is recovered from the organic waste.    USE - For recovering hydrogen from organic waste such as sewage sludge and biomass.    ADVANTAGE - The hydrogen is effectively recovered from the ammonia contained in the waste water generated during processing of organic waste. The ammonia is effectively decomposed using the decomposing catalyst whose catalytic activity is not reduced even in presence of water vapor. Thus, hydrogen is obtained efficiently. The recovered hydrogen is effectively used as energy source of electric power generating apparatus.    DETAILED DESCRIPTION - The organic waste is pre-processed by dehydration and drying. The gasification-reformation of the pre-processed organic waste is carried out to form a combustible gas. The dust in gas is then removed by cleaning process. The ammonia contained in waste water generated during pre-processing of organic waste, and waste water generated in cleaning process of gas, is recovered. The recovered ammonia is decomposed into hydrogen and nitrogen using a decomposition catalyst. Thus, hydrogen is recovered from the organic waste. The recovered hydrogen is utilized as energy source of electric power generating apparatus (8) such as gas engine or fuel cell.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of hydrogen recovery apparatus. (Drawing includes non-English language text).    Organic waste (1)    Dehydrator (2)    Dryers (3,10)    Gasification reformer (4)    Drainage-treatment process (5)    Dust-removal cleaning process (6)    Decomposition process (7)    Electric power generating apparatus (8)