Method of producing fertilizer out of sludge

Details Method of producing fertilizer out of sludge Method of producing fertilizer out of sludge

C - Chemistry, Metallurgy

05

F

C05F 17/00 (2006.01) C02F 11/18 (2006.01)

Patent

CA 2683831

A method of producing fertilizer out of sludge, in which method sludge is heated with superheated steam for achieving hygienization to destroy pathogenic microorganisms. In the method, the sludge is heated to a temperature of 60 to 100 0C with superheated steam having a temperature of 200 to 600 0C to activate increasing of the amount of soluble carbon in the sludge and to restart biodegradation of the sludge by using non-pathogenic microorganisms still remaining in the sludge after the heating.

L'invention porte sur un procédé de fabrication d'un engrais à partir d'une boue, procédé suivant lequel de la boue est chauffée par de la vapeur d'eau surchauffée pour parvenir à une hygiénisation afin de détruire les microorganismes pathogènes. Dans ce procédé, la boue est chauffée à une température de 60 à 100 °C par de la vapeur d'eau surchauffée ayant une température de 200 à 600 °C pour activer l'augmentation de la quantité de carbone soluble dans la boue et pour redémarrer la biodégradation de la boue par l'utilisation de microorganismes non pathogènes restant encore dans la boue après le chauffage.

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