Patent CA-2697333-A1 (CA)
Inventor: SCHLEDERER SWANTJE MIGNON
IPC: B01D21/24
Filed: 2008-08-21
Abstract: The invention relates to a sedimentation basin (2) for sewage treatment plants (1) for separating materials which can settle due to the action of gravity, such as sand, rocks or broken glass, from waste water (3) introduced in the inlet region of the sewage treatment plant (1). An efficient and compact design for the sedimentation basin (2) is achieved by way of flow guide walls (20) which present a meander-shaped curved path, a plurality thereof being disposed vertically adjacent to each other and parallel to the main flow direction (21) of the sedimentation basin (2). The slowing of the flow caused in this manner results in improved sedimentation, while requiring less space.     1. A sedimentation basin (2) for sewage treatment plants (1), comprising a basin (10) having an inlet region (14) for the fluid (waste water (3)) to be purified, the fluid (waste water (3)) containing substantially water and mineral (sand) and organic admixtures, and an outlet region (15) for the fluid (waste water (3)) from which the admixtures have been at least partially removed, planar installations disposed substantially parallel to the main flow direction (21) being present in the basin (10) between the inlet region (14) and the outlet region (15), characterized in that the installations are configured as structured flow guide walls (20) for the fluid (waste water (3)) which divert partial flows of the fluid (waste water (3)) in continuously alternating directions.     2. The sedimentation basin (2) according to claim 1, characterized in that the flow guide walls (20) are structured in a substantially meander-shaped manner, wherein the crests (24) of the waves (22) or meanders (23) run substantially perpendicularly to the ground (26) and therefore transversely to the main flow direction (21) between the inlet region (14) and outlet region (15).     3. The sedimentation basin (2) according to claim 1 or 2, characterized in that the flow guide walls (20) extend substantially from the upper edge (25) of the basin (10) to approximately the bottom (13) thereof.     4. A sedimentation basin (2) according to one or more of claims 1 to 3, characterized in that the distance between the bottom (13) of the basin (10) and the lower edge (27) of the flow guide walls (20) is constant and follows the contour of the bottom (13).     5. A sedimentation basin (2) according to one or more of claims 1 to 4, characterized in that the flow guide walls (20) run substantially parallel to each other or, in the case of a circular or circle sector shaped basin (10), run substantially in the radial direction.     6. A sedimentation basin (2) according to or more of claims 1 to 5, characterized in that the flow guide walls (20) are designed so as to be displaceable in the vertical direction.     7. A sedimentation basin (2) according to one or more of claims 1 to 6, characterized in that the basin (10) is configured in a substantially rectangular shape and the inlet region (14) and outlet region (15) are located at opposing sides or diametrically opposed corners (17) of the basin (10).     8. A sedimentation basin (2) according to one or more of claims 1 to 6, characterized in that the basin (10) is configured in a trapezoidal shape, wherein the inlet region (14) is disposed on the narrow side (16) of the trapezoid, and the outlet region (15) on the opposite side, and the flow guide walls (20) follow a diverging path with respect to the narrow side (16).     9. A sedimentation basin (2) according to one or more of claims 1 to 6, characterized in that the basin (10) is configured in a substantially circular shape and the inlet region (14) is disposed in the center of the basin (10) and the outlet region (15) is disposed at the edge (51) of the basin (10), wherein the flow guide walls (20) are disposed substantially in the radial direction.     10. A sedimentation basin (2) according to one or more of claims 1 to 6, characterized in that the basin (10) is configured in a substantially circle sector shape, the inlet region (14) is disposed in the center and the outlet region (15) is disposed at the opposite edge (51) of the basin (10), wherein the flow guide walls (20) are disposed substantially in the radial direction.     11. The sedimentation basin (2) according to one or more of claims 1 to 10, characterized in that the bottom (13) of the basin (10) ascends in the direction toward the outlet region (15), at least in a partial region (40).     12. A sedimentation basin (2) according to one or more of claims 1 to 11, characterized in that the basin (10) is equipped with a sludge collection chamber (41), which forms the lowest partial region (40) of the bottom (13) of the basin (10).     13. The sedimentation basin (2) according to claim 12, characterized in that at least one apparatus (42) is present in order to deliver the sediments (31) from the remaining bottom (13) of the basin (10) into the sludge collection chamber (41).     14. A sedimentation basin (2) according to one or more of claims 1 to 13, characterized in that the side walls (12) of the basin (10) extending between the inlet region (14) and the outlet region (15) have a shape that corresponds to the shape of the flow guide walls (20).     15. A sedimentation basin (2) according to one or more of claims 1 to 14, characterized in that a gas or a fluid (46) can be introduced into the basin (10) in the region of the bottom (13) and/or of the face walls (11) or of the side walls (12) of the basin.     16. A sedimentation basin (2) according to one or more of the preceding claims, characterized in that the flow guide walls (20) aire disposed substantially parallel to the ground (26) or at an angle oblique thereto.     17. A sedimentation basin (2) according to one or more of the preceding claims, characterized in that flow guide walls (20) having different lengths are disposed therein.    18. A sedimentation basin (2) according to one or more of the preceding claims, characterized in that the flow guide walls (20) are provided with an additional structuring at the surfaces thereof, the respective dimensions of which are considerably smaller than the distances of the waves (22) or the meanders (23).