NOVELTY - An organic waste is subjected to methane fermentation and methane gas is recovered. A liquid fertilizer is produced from slurry obtained. An excrement and urine are mixed with straw. The suspension of straw and excrement is solid-separated and straw collected is dried and fermented to obtain a compost. A portion of liquid excrement is recycled to methane fermentation. Thus, organic waste is processed.    USE - For processing organic wastes such as fishery group waste material and organic refuse, and obtained methane gas is used for generating electric power and heat.    ADVANTAGE - The methane fermentation of organic waste is processed efficiently and a compost of straw is obtained effectively. The methane after methane fermentation is recovered efficiently, and electricity and heat are produced in large amount from the methane recovered. By using simple dry installation and fermentation installation, fermentation of straw to produce compost is performed, without supplying fuel at intense-cold term. A high liquid fertilizer is obtained from the slurry after performing methane fermentation. By removing the condensed water in the waste gas produced, flowmeter is stabilized even under intense cold. Without using power, portion of slurry after methane fermentation is introduced into the de-sulfurizing apparatus and desulfurization of methane gas is performed efficiently.    DETAILED DESCRIPTION - An organic waste containing stock raising waste material as main component, is subjected to methane fermentation in a methane-fermentation tank (38) and methane gas is recovered. The obtained methane gas is used for generating electric power and heat. A liquid fertilizer is produced from the slurry obtained after methane fermentation. An excrement and urine are mixed with straw in an acceptance tank. The suspension of straw and excrement is provided into a gathering-up machine and straw is collected. The straw collected is dried and is fermented to obtain a compost. A portion of the liquid excrement is recycled to the methane fermentation and remainder of excrement is recycled to the acceptance tank. Thus, the organic waste is processed.    An INDEPENDENT CLAIM is included for a processing apparatus of organic waste which has the acceptance pit, the gathering-up machine for receiving the suspension of straw and excrement, a screen belt provided on the gathering-up machine, a solid-liquid separation machine for separating stock and liquid excrement, a pre-processor (10) having a pump for extracting excrement and a waste-material acceptance tank (14) for accepting the organic waste and excrement obtained from the preprocessor. The processing apparatus has methane-fermentation tank for performing methane fermentation of organic waste, a de-sulfuring apparatus (52) for performing de-sulfurization of methane gas collected from the methane-fermentation tank, an electric-power generating unit and/or heat-use unit which utilizes desulfurized methane gas as fuel and a digestive-liquor storage tank (72) for accepting slurry from the methane-fermentation tank and for producing liquid fertilizer from slurry. The processing apparatus has a dry installation (62) for drying the organic waste and straw obtained from the preprocessor, and a compost fermentation installation (64) for fermenting straw obtained to produce compost.    DESCRIPTION OF DRAWING(S) - The figure shows the systematic outline structure of the processing apparatus of organic waste. (Drawing includes non-English language text).    Pre-processor (10)    Waste-material acceptance tank (14)    Methane-fermentation tank (38)    De-sulfuring apparatus (52)    Dry installation (62)    Compost fermentation installation (64)    Digestive-liquor storage tank (72)