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CLARIFICATION 7,13

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FIGURE 7.7 Typical sludge hopper arrangements for rectangular basins.

ing of the profiles to create an overlapping effect. When the hydraulic cylinder reaches
the end of its stroke, the grid system reverses at a speed 2 to 3 times the forward speed.
This allows the triangular profiles to wedge their way under the sludge. This oscillating
movement of the collector with the concave profile is said by the manufacturer to pro-
vide thickening of the sludge.
The low clearance of 10 in. (25 cm) on the bottom of the basin allows the system to
work well under tube-and-plate settler systems.