Sewage sludge treatment with gas injection

Details Sewage sludge treatment with gas injection Sewage sludge treatment with gas injection

C - Chemistry, Metallurgy

02

F

362/11, 362/44.5

C02F 3/26 (2006.01) C02F 1/66 (2006.01) C02F 1/78 (2006.01)

Patent

CA 2033000

This invention relates to a sewage sludge treatment system resulting in an oxygenated and/or ozonated treated sludge containing substantially no pathogens. The system includes apparatus (10) and a process for mascerating raw sludge, adjusting the pH to about 2.5 to about 3, adjusting the solids content to about 2.5% to about 4%, adjusting the temperature, if necessary, to about 20°C to about 40°C, mixing an oxygen-rich gas, such as oxygen and/or ozone with the sludge as the sludge is mixed or recirculated through a hyperbaric vessel (12) and simultaneously injecting the oxygen-rich gas into a combination gas and sludge mixing and dispersing assembly (30) in an upper portion (16) of the hyperbaric vessel (12). Such injection causes mixing of the gas and sludge and dispersement of such mixture in a plurality of streams (76) to atomize and oxygenate the sludge.

L'invention porte sur un système de traitement de boues résiduaires, produisant des boues traitées, oxygénées et (ou) ozonisées, ne renfermant pratiquement plus de pathogènes. Le système comprend un appareil (10) et un procédé pour macérer les boues brutes, ajuster le pH à environ 2,5-3, la teneur en solides à environ 2,5-4 %, la température, si nécessaire, à environ 20-40 degrés C, mélanger un gaz riche en oxygène, comme de l'oxygène et (ou) de l'ozone, avec les boues, à mesure que celles-ci sont mélangées ou mises en recirculation dans un contenant hyperbare (12), injecter simultanément le gaz riche en oxygène dans un dispositif de brassage et de dispersion de gaz et de boues (30) dans la partie supérieure (16) du contenant hyperbare (12). Cette injection a comme effet de mélanger les gaz et les boues, et de disperser le mélange résultant en plusieurs flux (76), avec atomisation et oxygénation des boues.

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