PROCESS AND SYSTEM FOR THE RECYCLING IN AGRICULTURE OF THE NUTRIENTS COMING FROM THE FOOD CHAIN

摘要

A description is given of a process for the recovery of nutrients and for the preparation of fertilisers from organic substrates from waste coming from the cycle of production and consumption of foodstuffs comprising anaerobic digestion as a continuous process in a plurality of digesters placed in series at temperatures higher than the pasteurisation temperature,with production of a digestate (fertiliser 1) and of biogas and extraction as a continuous process of ammonia to produce an ammonium salt (fertiliser 2). A description is also given of a system comprising a plurality of digesters placed in series, means for the recirculation as a continuous process of part of the fluid present in the digesters and means for the injection of steam, first and second Venturi scrubbers , tanks for storage of fertilises 1 and 2 and a series of service gas lifts or pipes distributed along the perimeter of the digesters for the transfer of the digestate from the base into the ceiling of each respective digester .