Biosolids stabilization process

Details Biosolids stabilization process Biosolids stabilization process

C - Chemistry, Metallurgy

02

F

C02F 1/76 (2006.01) C02F 11/06 (2006.01)

Patent

CA 2589904

A method utilizing chlorine dioxide and, optionally, and acid or other non- charged chemical species for the treatment of biosolids to destroy pathogens is provided. The method uses chlorine dioxide to modulate the ORP of the matrix. In one embodiment, the invention employs acidification of the sludge (biosolids) to a pH of less than 4.0, and provides for the addition of nitrous acid for enhanced disinfection in a closed system to prevent volitalization.

L'invention concerne un procédé mettant en oeuvre du dioxyde de chlore et, éventuellement, de l'acide ou d'autres espèces chimiques non chargées pour le traitement de biosolides, aux fins de destruction de pathogènes. Le procédé met en oeuvre du dioxyde de chlore afin de moduler le ORP de la matrice. Dans un mode de réalisation, le procédé selon l'invention consiste à acidifier les boues (biosolides), de manière à obtenir un pH inférieur à 4,0 et à ajouter de l'acide nitreux aux fins de désinfection améliorée dans un système fermé, de manière à empêcher la volatilisation.

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