| 摘要 |
PCT No. PCT/EP93/01795 Sec. 371 Date Feb. 3, 1994 Sec. 102(e) Date Feb. 3, 1994 PCT Filed Jul. 9, 1993 PCT Pub. No. WO94/01191 PCT Pub. Date Jan. 20, 1994.An underwater clearing device for round sewage treatment basins having an approximately radially extending clearing device formed as a rake blade (8) that is revolvingly driven and sweeps along the bottom (2) of the round sewage treatment basin. The drive of the rake blade (8) being coupled to the rake blade (8) radially on the outside or radially on the inside via a toothed ring (11) provided solely for the revolving movement of the rake blade (8). The rake blade (8) and frame (10) forming a unit arranged under water. A driven transverse conveyor (31) may be provided instead of rake blade.
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