B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 24/46 (2006.01) B01D 24/12 (2006.01) B01D 35/16 (2006.01)
Patent
CA 2576034
The filter contaminant loading capacity of a depth granular media filter is increased by imposing a so-called "back-slip" on the filter bed. At intervals between normal backwashing, a volume of liquid is passed upwardly through the media bed under flow conditions selected to displace at least some of the contaminants upwardly in the bed while essentially removing none of the contaminants from the filter vessel. Preferably, the filter bed comprises at least two media types of different but uniform particle sizes and densities, the media types each forming a distinct layer in which the effective particle size of the media in each successive layer decreases in a downward direction in the vessel.
L~invention porte sur la capacité de chargement de contaminant de filtre d~un filtre de milieux granulaires profonds que l~on augmente en imposant ce que l~on appelle un "coin de retour" sur le banc de filtre. A des intervalles entre des réextractions normales, on fait passer un volume de liquide vers le haut à travers le lit de milieux dans des conditions d~écoulement sélectionnées pour déplacer au moins une partie des contaminants vers le haut dans le banc sans retirer, globalement, de contaminants du récipient de filtre. De préférence, le banc de filtre comprend au moins deux types de milieux de tailles particulaires et de densités différentes mais uniformes, les types de milieux formant chacun une couche distincte dans laquelle la taille particulaire effective des milieux dans chaque couche successive décroît vers le bas dans le récipient.
Brown Craig J.
Sheedy Michael A.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Eco-Tec Limited
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