B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/140
B01D 21/24 (2006.01)
Patent
CA 1109002
ABSTRACT OF THE DISCLOSURE This invention relates to a settling tank adapted for low-turbulence settling of solids such as fine silt and clay from water. By the use of a continuous process involving con- tinuous removal of settled solids, it is possible to dispose of the solids through a system of re-inserting the solids into the extracted tar sands, from whence the tar sands loaded with the silt can be returned to the excavation site. This permits the continuous settling of clay water, removal of settled clay slurry, and re-insertion of the clay slurry into the extracted tar sands. Continuous operation also makes possible recycling the water from extraction discharge back into the extraction step; avoids discharge of the effluent containing oil emulsions, finely divided clay and other pollutant into our water courses, and avoids the necessity for large storage ponds for the treatment of such water to enable it to be returned to a water course. The specification discloses a system comprising a circular tank for retention of water during settling, a radial boom provided at the level of the surface of the water for rotation around a central hub, means for rotating the boom, said boom having a leading edge and a trailing edge, said leading edge having a horizontal forwardly projecting shelf below the level of the water, said trailing edge having a horizontal rearwardly project- ing shelf also below the level of the water, said leading edge shelf, trailing edge shelf and boom bottom presenting a smooth continuous surface for non-turbulent passage through the water, said trailing edge having a means for uniform and non-turbulent supply of solids-containing water to the length of the shelf at a volume rate equal to the rate of horizontal displacement of the forwardly moving boom, said leading edge having a means for - a - ABSTRACT OF THE DISCLOSURE - Cont'd. uniform and non-turbulent removal of cleared water from the length of the shelf at a rate equal to the displacement of the forwardly moving boom. - b -
242059
Gowling Lafleur Henderson Llp
Magna International Inc.
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