Processes to beneficiate heat-dried biosolid pellets

C - Chemistry – Metallurgy – 05 – F

Patent

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Details

C05F 7/00 (2006.01) C05F 11/00 (2006.01) C05G 5/00 (2006.01)

Patent

CA 2670866

This invention is directed to systems, devices and methods for modifying the process of producing dried biosolids pellets or granules into beneficiated inorganically- augmented bioorganic fertilizer. The present invention describes a method to beneficiate heat-dried biosolids or sludge pellets or granules as presently manufactured by municipalities or companies from a) dewatered municipal wastewater biosolids or sludges within the municipal wastewater treatment plant heat-dried biosolids production facility or from b) finished dry heat dried biosolids pellets or granules in a separate manufacturing facility from the municipal wastewater treatment plant to produce a fertilizer containing sufficient organic and inorganic plant nutrients to be valuable and saleable into the commercial agricultural industry. The present invention describes beneficiation methods to increase the plant nutrient content to a level which permits the finished beneficiated dried biosolids pellet or granule product to compete in the commercial agricultural fertilizer marketplace and also to reduce the odors associated with traditionally-produced heat dried biosolids.

L'invention porte sur des systèmes, des dispositifs et des procédés de modification du processus de transformation de boulettes ou granules de biosolides thermoséchés en engrais bioorganiques améliorés par adjonction de minéraux. L'invention porte en particulier sur une méthode de rentabilisation des boulettes ou granules de biosolides thermoséchés actuellement produits par des municipalités ou entreprises à partir: a) de biosolides ou de boues déshydratés provenant des installations de thermoséchage des usines municipales de traitement des eaux usées et b) de biosolides ou de boues déshydratés finis produits dans des installations différentes des usines municipales de traitement des eaux usées et transformés en engrais contenant des nutriments organiques et minéraux en quantité suffisante pour être exploités et commercialisés par les industries agricoles. L'invention décrit les procédés de rentabilisation des boulettes ou granules de biosolides sortant d'usine et en accroissant la teneur en nutriments pour en faire un produit fini pouvant rivaliser avec les engrais du marché, tout en réduisant les mauvaises odeurs traditionnellement associées à la production traditionnelle de biosolides thermoséchés

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