Process for treating sludge and manufacturing...

C - Chemistry – Metallurgy – 05 – F

Patent

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C05F 7/00 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2678548

The invention describes a method for treating sludge to produce high nitrogen organically-augmented inorganic fertilizer that can compete with traditional The method involves conditioning dewatered biosolids or organic sludge, and treating with an oxidizer to reduce odorant effects and an acid This mix is then interacted with concentrated sulfuric and or phosphoric acids and an ammonia source or alternatively a hot or molten melt or salt of ammonium sulfate/phosphate to form a fertilizer mix under controlled temperature, pressure and retention times This invention can also be an add-on to commercial production of ammonium salts The fertilizer produced by the present invention contains more than 8 wt % nitrogen and preferably 15 wt % nitrogen The invention is tailored for biosolids production in individual municipal waste treatment plants by keeping the fertilizer manufacturing plants of the present invention small with a minimization of logistics and liability

La présente invention concerne un procédé de traitement de boues et de fabrication de fertilisant inorganique à forte teneur en azote enrichi en matière organique pouvant rivaliser avec des fertilisants classiques. Le procédé comprenant le conditionnement de biosolides ou de boues organiques asséché(e)s, et le traitement avec un oxydant pour réduire les effets odorants et un acide. Ce mélange est ensuite amené à interagir avec des acides sulfuriques et/ou phosphoriques concentrés et une source d'ammoniac ou en variante un sel sulfate/phosphate d'ammonium chaud ou fondu pour former un mélange de fertilisant sous température, pression et temps de rétention contrôlés. La présente invention peut également constituer un additif à une production commerciale de sels d'ammonium. Le fertilisant produit selon la présente invention contient plus de 8% en poids d'azote et de préférence plus de 15% en poids d'azote. La présente invention est spécialement conçue pour la production de biosolides dans des installations de traitement de déchets urbains en permettant l'installation de petites unités de fabrication de fertilisant avec un minimum de logistique et de risque.

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