Sludge treatment process

Details Sludge treatment process Sludge treatment process

C - Chemistry, Metallurgy

02

F

C02F 11/00 (2006.01)

Patent

CA 2569076

A method utilizing chlorine dioxide and nitrous 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, 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 qui fait appel au dioxyde de chlore et à l'acide nitreux ou à d'autres espèces chimiques non chargées pour traiter des biosolides afin de détruire les pathogènes. Selon le procédé de l'invention, on utilise du dioxyde de chlore pour moduler le potentiel d'oxydo-réduction de la matrice, on procède à une acidification des boues (biosolides) à un pH inférieur à 4,0, et, afin d'obtenir une désinfection améliorée, on ajoute de l'acide nitreux dans un système fermé pour empêcher la volatilisation.

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