system for the preparation of a mixture of organic fraction of municipal solid waste for a differentiated process of anaerobic digestion

摘要

The invention relates to a system for preparing a mixture of organic fraction of urban solid waste and water to be fed to an anaerobic digestion process, the system comprising a first separation stage (2) for separating a first heavy fraction of said urban solid waste and a second separation stage (3), wherein the second separation stage comprises first (4) and second (10) separation means for said urban solid waste, the first means being configured to remove a light fraction of the urban solid waste, the light fraction at least partially emerging from the free surface in the second stage, the second means comprising an outlet duct (11) for the mixture from the second stage; the outlet duct having a mouth (12) arranged below the free surface in the second stage and a mouth (13) arranged at a level between the free surface in the second stage and the mouth.