NOVELTY - The method for treating slaughterhouse wastes, comprises biologically processing the waste in a fermenter (5), converting the gas developed during the fermentation of the waste into an electric energy (12) and process heat by a block-type thermal power station (10), and processing the fermentation residue remaining after the fermentation. The processing of the fermentation residue takes place by sanitization of the fermentation residue, solid/liquid separation of the sanitized residue in a decanter (25), and dehydration of the decanter-liquid in a two-stage vacuum evaporation plant (28).    USE - Method for the treatment of slaughterhouse wastes for biogas production.    ADVANTAGE - The method ensures effective and energy efficient treatment of slaughterhouse wastes without damage to the microorganisms in the fermenter.    DETAILED DESCRIPTION - The method for the treatment of slaughterhouse wastes, comprises biologically processing the waste in a fermenter (5), converting the gas developed during the fermentation of the waste into an electric energy (12) and process heat by a block-type thermal power station (10), and processing the fermentation residue remaining after the fermentation. The processing of the fermentation residue takes place by sanitization of the fermentation residue, solid/liquid separation of the sanitized fermentation residue in a decanter (25), dehydration of the decanter-liquid in a two-stage vacuum evaporation plant (28), where an evaporation-concentrate and a liquid distillate are developed, and recooling of the distillate from the evaporation plant in a recooling plant, where the waste heat of the thermal power station is used for dehydration in the evaporation plant. The decanter liquid in the evaporation plant is led into the circulation and a partial flow of the circulating evaporation-concentrate is extracted by an adjustable concentrate pump. The circulating evaporation-concentrate is adjusted to a value of 25-30%. An estimated value for the drying substance content is formed from the recooling process of the recooling plant and is used as actual value for the regulation of the concentrate pump. The distillate is subjected to a reverse osmosis after discharge from the cooling back plant, and is supplied as process water. An INDEPENDENT CLAIM is included for a plant for the treatment of slaughterhouse wastes.    DESCRIPTION OF DRAWING(S) - The diagram shows a process pattern of a waste treatment plant.    Fermenter (5)    Thermal power station (10)    Electric energy (12)    Decanter (25)    Vacuum evaporation plant. (28)