Skimming Blade

ON ONE TRUSS EFFLUEN'

FIG. 7.17.3 Parts of a circular basin. (Courtesy of the FMC Corp., Material Handling Systems Division)

depositions in basin corners. Corner sweeps added to circular sludge collection mechanisms to remove sludge settling in the corners have been a source of mechanical difficulty. Because of these problems, few square basins are constructed for water treatment.

Circular settling tanks are often chosen because they use a trouble-free, circular sludge removal mechanism and, for small plants, can be constructed at a lower capital cost per unit surface area.

Figures 7.17.2 and 7.17.3 show the details of rectangular and circular horizontal flow clarifiers.

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