Method and apparatus for preparing material for microbiological fermentations

The present invention relates to a method for preparing organic 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, with at least one of the following steps: - disintegrating and/or liquefying the organic and/or cellulosic material by using a jet pump (1) and/or - creating a supersonic shock zone in a jet pump (1) the organic and/or cellulosic material is supplied to in order to disintegrate and/or liquefy the organic and/or cellulosic material and/or - applying high pressure steam to an annular ring chamber (6) enclosing a tube (2) of a jet pump (1) and directing the steam into the tube (2) of the jet pump (1) thereby sucking organic and/or cellulosic material into the tube (2) and creating a supersonic shock zone (9) in the jet pump (1) in order to disintegrate and/or liquefy the organic and/or cellulosic material. The present invention also relates to an apparatus for preparing organic material for microbiological fermentations of municipal waste water sludge for reducing the waste water sludge and/or of cellulosic material for production of biofuels comprising a jet pump (1).