| 摘要 |
Disclosed is a bioreactor apparatus having a bed of buoyant media pellets floating within a filtrate to be processed. The apparatus includes a tank (22) having a peripheral wall for containing filtrate (34) and a bed (36) of media pellets (38). A central manifold (100) is rotatably supported within the tank, the central manifold being mounted for rotation about a vertical axis (22) and having a plurality of longitudinally spaced openings (140) intermediate its ends, the openings adapted to eject filtrate in a generally horizontal direction and along a substantially vertical plane toward the wall of the tank, cyclically fluidize pellets in a directly narrow zone. In a preferred aspect, there is also a thrust manifold (140), generally parallel to the axis of the central manifold and having a plurality of longitudinally spaced openings intermediate its ends directed horizontally and generally perpendicularly to the plane. The thrust manifold (150) is supported in association with the central manifold (100) inwardly adjacent the tank wall and offset rearwardly of the plane to rotate with the central manifold. Filtrate is fed to the central manifold (100) and the thrust manifold (150), whereby the of filtrate ejected by the central manifold fluidizes a vertical zone of pellet media around and in front of the thrust manifold (150) and rotation of the central manifold and thrust manifold is caused by filtrate ejected from the openings in the thrust manifold. The invention also comprehends specially designed pellet media for optimum performance. The manifolds may be structured for retrofitting in existing bioreactors.
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