Fluidized bed precipitator

B - Operations – Transporting – 01 – J

Patent

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Details

B01J 8/20 (2006.01) B09B 3/00 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2693117

Improved fluidized bed precipitators (20,46, 62, 74, 108, 112, 134, 168) especially useful for the treatment of waste waters containing soluble phosphorus are provided, having upright, primary fluidized bed sections (22, 48, 64, 76, 110, 114, 136) and obliquely oriented solids settling sections (28, 54, 68, 120, 144) which enhance the settling of small particles (166) and return thereof to the fluidized bed sections (22, 48, 64, 76, 110, 1 14, 136). The precipitators (20, 46, 62, 74, 108, 112, 134, 168) may also be equipped with a solids detection/withdrawal assembly (178) made up of one or more pressure transducers (180,182) operable to determine the pressures within the fluidized bed sections 22, 48, 64, 76, 110, 114, 136) as a measure of bed densities, along with a selectively operable valve (172) which may be opened to periodically remove solids without clogging. The precipitators (20, 46, 62, 74, 108, 112, 134, 168) may be used to control soluble phosphorus levels in single- or multiple lagoon (184, 186) waste water systems.

L'invention propose des appareils de précipitation à lit fluidisé améliorés (20, 46, 62, 74, 108, 112, 134, 168) qui s'utilisent particulièrement pour le traitement des eaux usées contenant du phosphore soluble, et qui présentent des sections de lit fluidisé primaires droites (22, 48, 64, 76, 1 10, 1 14, 136) et des sections de sédimentation de solides orientées à l'oblique (28, 54, 68, 120, 144) qui accentue la sédimentation de petites particules (166) et leur retour vers les sections de lit fluidisé (22, 48, 64, 76, 110, 1 14, 136). Les appareils de précipitation (20, 46, 62, 74, 108, 1 12, 134, 168) peuvent également être équipés d'un ensemble de détection/élimination des solides (178) constitué d'un ou de plusieurs transducteurs de pression (180, 182) utilisables pour déterminer les pressions dans les sections de lit fluidisé (22, 48, 64, 76, 110, 1 14, 136) en tant que mesure des densités de lit, conjointement avec une vanne utilisable (172) sélectivement qui peut être ouverte pour éliminer périodiquement les solides sans obstruction. Les appareils de précipitation (20, 46, 62, 74, 108, 112, 134, 168) peuvent être utilisés pour réguler les taux de phosphore solubles dans des systèmes d'eaux usées à lagon simple ou multiple (184, 186).

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