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 the following steps: a) anaerobic digestion as a continuous process in a plurality of digesters placed in series (I, II, III) of the organic substrates at temperatures higher than the pasteurisation temperature, generally around 55°C, for a sufficient time for the thermophilic digestion of the same organic substrates with production of a digestate (fertiliser 1) and of biogas; b) recirculation as a continuous process of part of the fluid present in the digesters and injection of steam to provide the heat necessary for maintaining the temperature of the same digesters and encourage the extraction of ammonia; c) extraction as a continuous process of the ammonia by means of the sending of biogas coming from said digesters into a Venturi scrubber for the neutralisation with acid to give an ammonium salt (fertiliser 2); d) continuous extraction of biogas from a second Venturi scrubber for scrubbing for use as fuel in internal combustion engines and to provide the heat and all the energy required by the process; e) storage of fertiliser 1 in a tank of sufficient capacity to supply fertiliser 1 preferably in the period of fertilisation before sowing, and storage of fertiliser 2 in a tank of sufficient capacity to supply fertiliser 2 in the period of fertilisation also subsequent to sowing; f) wherein the transfer of the digestate between the digesters is provided from the base into the ceiling of each digester (I, II, III) by means of a respective series of service gas lifts or pipes (Sa, Sb, Sc) actuated with compressed biogas and distributed along the perimeter of the digesters. a) anaerobic digestion as a continuous process in a plurality of digesters placed in series (I, II, III) of the organic substrates at temperatures higher than the pasteurisation temperature, generally around 55°C, for a sufficient time for the thermophilic digestion of the same organic substrates with production of a digestate (fertiliser 1) and of biogas; b) recirculation as a continuous process of part of the fluid present in the digesters and injection of steam to provide the heat necessary for maintaining the temperature of the same digesters and encourage the extraction of ammonia; c) extraction as a continuous process of the ammonia by means of the sending of biogas coming from said digesters into a Venturi scrubber for the neutralisation with acid to give an ammonium salt (fertiliser 2); d) continuous extraction of biogas from a second Venturi scrubber for scrubbing for use as fuel in internal combustion engines and to provide the heat and all the energy required by the process; e) storage of fertiliser 1 in a tank of sufficient capacity to supply fertiliser 1 preferably in the period of fertilisation before sowing, and storage of fertiliser 2 in a tank of sufficient capacity to supply fertiliser 2 in the period of fertilisation also subsequent to sowing; f) wherein the transfer of the digestate between the digesters is provided from the base into the ceiling of each digester (I, II, III) by means of a respective series of service gas lifts or pipes (Sa, Sb, Sc) actuated with compressed biogas and distributed along the perimeter of the digesters.