NOVELTY - The composite waste material incineration processing system has system (I) having incinerator (10) for processing waste material, system having methane fermentation tank (30) for processing moisturized waste material, ash cleaning unit (A), and gas separation apparatus (B). Unit (A) carries out wet cleaning of ash generated in system (I). Apparatus (B) separates methane gas (34) and carbon dioxide (35) from gas generated in tank (30). The separated carbon dioxide is introduced to ash cleaning unit, and cleaning is carried out in presence of carbon dioxide.    USE - For incineration processing of composite waste material, such as municipal solid waste, sewage sludge and industrial waste.    ADVANTAGE - The heavy metal and chlorine are effectively removed from ash generated by incineration process. Carbon dioxide generated within the system is effectively used, and requirement of fuel is prevented.    DETAILED DESCRIPTION - The composite waste material incineration processing system has incineration processing system having incinerator (10) for processing waste material, methane fermentation processing system having methane fermentation tank (30) for processing moisturized waste material, ash cleaning unit, and gas separation apparatus. The ash cleaning unit carries out wet cleaning of ash generated in incineration processing system. The gas separation apparatus separates methane gas (34) and carbon dioxide (35) from fermentation gas generated in tank (30). The separated carbon dioxide is introduced to ash cleaning unit, and cleaning is carried out in presence of carbon dioxide.    An INDEPENDENT CLAIM is included for composite waste material incineration processing method.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of composite waste material incineration processing system. (Drawing includes non-English language text).    Incinerator (10)    Methane fermentation tank (30)    Vacuum pressure swing adsorption apparatus (31)    Methane gas (34)    Carbon dioxide (35)