Abrégé

The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. Subsequently the neutralised bleaching earths are subjected to anaerobic digestion by a biomass comprising anaerobic bacteria. During the digestion biogas, which may optionally be subjected to purification, and a solid/liquid suspension are generated. The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. Subsequently the neutralised bleaching earths are subjected to anaerobic digestion by a biomass comprising anaerobic bacteria. During the digestion biogas, which may optionally be subjected to purification, and a solid/liquid suspension are generated. The solid/liquid suspension is subsequently separated into a solid component comprising the bleaching earths and a liquid component comprising the digestate. The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. Subsequently the neutralised bleaching earths are subjected to anaerobic digestion by a biomass comprising anaerobic bacteria. During the digestion biogas, which may optionally be subjected to purification, and a solid/liquid suspension are generated. The solid/liquid suspension is subsequently separated into a solid component comprising the bleaching earths and a liquid component comprising the digestate. The bleaching earths are then subjected to heat treatment, at a temperature between 400° C. and 600° C. The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. Subsequently the neutralised bleaching earths are subjected to anaerobic digestion by a biomass comprising anaerobic bacteria. During the digestion biogas, which may optionally be subjected to purification, and a solid/liquid suspension are generated. The solid/liquid suspension is subsequently separated into a solid component comprising the bleaching earths and a liquid component comprising the digestate. The bleaching earths are then subjected to heat treatment, at a temperature between 400° C. and 600° C. Then follows a reactivation of the heat-treated bleaching earths with the aid of an acid solution and drying of the regenerated earths to render them usable in a plant for the production of biofuels.

Classes IPC  ?

• B01J 20/34 - Régénération ou réactivation
• B01D 53/14 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par absorption
• B01D 53/86 - Procédés catalytiques
• B09B 3/40 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif impliquant un traitement thermique, p. ex. évaporation
• B09B 3/65 - Traitement anaérobie
• B09B 3/70 - Traitement chimique, p. ex. ajustement du pH ou oxydation

Abrégé

The invention relates to a method and a plant for treating or regenerating spent bleaching sands/earths from a plant for the production of biofuel, in particular from the bleaching pre-treatment of feedstocks of plant origin that are used for the production of biofuels. The method comprises a first pre-treatment step in which the bleaching earths mixed with neutral water or with gummy acid water are neutralised by adding a base, preferably calcium hydroxide, in order to bring the pH to neutrality. Subsequently the neutralised bleaching earths are subjected to anaerobic digestion by a biomass comprising anaerobic bacteria. During the digestion biogas, which may optionally be subjected to purification, and a solid/liquid suspension are generated. The solid/liquid suspension is subsequently separated into a solid component comprising the bleaching earths and a liquid component comprising the digestate. The bleaching earths are then subjected to heat treatment, at a temperature between 400°C and 600°C. Then follows a reactivation of the heat-treated bleaching earths with the aid of an acid solution and drying of the regenerated earths to render them usable in a plant for the production of biofuels.

Classes IPC  ?

• B09B 3/65 - Traitement anaérobie
• B09B 3/70 - Traitement chimique, p. ex. ajustement du pH ou oxydation