NOVELTY - The method for preparing material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for the production of biofuels by jet pumps for disintegration or liquefaction of organic material having cellulosic material, comprises recirculating the municipal waste water sludge through the jet pump and then returning to the aerobic or anaerobic fermenter. The liquefaction of the cellulosic material is carried out before fermenting the cellulosic material.    USE - Method for preparing material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for the production of biofuels by a jet pump for disintegration or liquefaction of organic material, where the biofuels are useful for heating devices and/or internal combustion engines of motor vehicles (claimed).    ADVANTAGE - The method is capable of economically preparing the material with less energy consumption and high efficiency.    DETAILED DESCRIPTION - The method for preparing material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for the production of biofuels by jet pumps for disintegration or liquefaction of organic material having cellulosic material, comprises recirculating the municipal waste water sludge through the jet pump and then returning to the aerobic or anaerobic fermenter. The liquefaction of the cellulosic material is carried out before fermenting the cellulosic material. The jet pump are used for liquefaction of slurry in water of precut or pulverized cellulosic material, and are connected in series. Chemicals such as sodium hydroxide are added to aid the disruption or liquefaction process before or during the disruption or liquefaction step. Acids are added post liquefaction to enable acid hydrolysis during disintegration or liquefaction. Enzymes are added to hydrolyze the cellulose. The sources of cellulosic materials are cut grass, wheat stalks, sugar cane waste and/or sugar beet waste products. An INDEPENDENT CLAIM is included for an apparatus for preparing material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for production of biofuels by a jet pump.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic sketch of a method for preparing material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for the production of biofuels.