TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Conditions: The carbonized material is used in an adsorption apparatus (39) of organic matter in treated water separated with sludge by the waste-disposal apparatus, as adsorption agent. Carbonization is carried out at 500degreesC or more. The carbonized material produced by the carbonizer is used as de-sulfurizing agent of the de-sulfurizer. The carbonized material whose de-sulfurization capability is reduced, is water-washed. The carbonized material is used as adsorption agent in the deodorizer of malodorous gas, and as fuel for boiler. The carbonization gas is used as fuel for heating the carbonization furnace (9). The waste gas is used for heating the carbonization furnace and methane-fermentation tank, and as heat source of the drier and for heating thickened sludge. The high-concentration malodorous gas produced from the waste material is sucked by a suction blower via a duct, and introduced into the combustion furnace (10) as combustion-air source. Oxidative decomposition of the offensive odor component is carried out with the combustion heat.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Arrangement: The methane fermenter has a waste-disposal apparatus (16) for waste liquid produced after methane fermentation, a de-sulfurizer (19) for sulfur removal from methane-fermentation gas, and a boiler (46) for heating methane-fermentation tank (15). A solid-liquid separator is used for solid-liquid separation of the carbonized material obtained by break-though by organic-matter adsorption, and the separated solid waste material is supplied to the carbonizer. A water-washing device is provided for removing sulfuring acid. A solid-liquid separator separates the water-washed carbonized material, and the separated solid water material is carbonized, and is also used as regeneration installation of waste de-sulfurizing agent regeneration for reuse. A deodorizer (44) which adsorbs malodorous gas is also used as fertilizer supplier which supplies carbonized material as fertilizer. A mixer (47) is provided for mixing the carbonized material and waste liquid after methane fermentation, to produce a fertilizer. A drier (37) is provided for drying the solid content obtained by solid-liquid separation. The waste-disposal apparatus has a heater for thickened sludge produced by waste-liquid processing.