METHOD FOR THE CONVERSION OF BIOMASS FROM RENEWABLE RAW MATERIALS IN ANAEROBIC FERMENTERS

摘要

The invention relates to the field of biochemistry and relates to a method that is used in a biogas production plant. The object of the present invention is a method which realizes a shorter total retention time of the raw materials in the biogas plant and/or a higher quantity and/or quality of the biogas. The object is attained through a method in which renewable raw materials are placed in an at least first anaerobic fermenter/reactor together with liquid and further starting materials necessary for methanogenesis, and there subjected to a fermentation process. Subsequently the fermentation residue is subjected to a solid/liquid phase separation and the separated solid phase is subjected to thermopressure hydrolysis at temperatures of at least 170° C. and pressures of at least 1.0 MPa. The solid phase thus treated may either be returned to the first anaerobic fermenter/reactor or fed to a second anaerobic fermenter/reactor and subjected to a further fermentation process.