Process and device for the aerobic-thermophilic...

C - Chemistry – Metallurgy – 02 – F

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C02F 11/00 (2006.01) A61L 11/00 (2006.01) C02F 11/02 (2006.01) C02F 11/06 (2006.01) C02F 11/18 (2006.01)

Patent

CA 2558186

1. A process for the stabilization and disinfection of sludge wherein a) ~raw sludge having a dry matter content of from 3 to 7 % by weight is fed continuously or quasi-continuously into a first stage, where it remains for an average retention time of three to ten days under aerobic-thermophilic conditions to obtain a partially stabilized sludge; b) ~said partially stabilized sludge is fed into a second stage in which disinfection of the partially stabilized sludge is effected at temperatures of at least 50 °C, wherein prior to discharging, there is no charging until said partially stabilized sludge has been disinfected.

L'invention concerne un procédé permettant de stabiliser et de désinfecter des boues par voie aérobie-thermophile, selon lequel, a) des boues brutes sont introduites avec une proportion de substance sèche de l'ordre de 3 à 7 % en poids, de manière continue ou quasi continue, dans un premier étage où elles séjournent en moyenne entre trois et dix jours, dans des conditions aérobie thermophiles, afin d'obtenir des boues partiellement stabilisées; b) les boues partiellement stabilisées sont introduites dans un second étage dans lequel intervient une désinfection des boues partiellement stabilisées, à des températures de l'ordre d'au moins 500 °C, d'autres boues n'étant pas introduites, avant soutirage, tant que les boues partiellement stabilisées ne sont pas désinfectées.

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