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 ERDC TN-DOER-T7
October 2004
throughput, causing the fine sand to report with the fines. This will improve the permeability of
the cake produced in the follow-on dewatering processes, but may also decrease compressibility.
The sump on the sand screw provides some surge capacity for the system and takes advantage of
the fact that coarse materials are difficult to maintain in suspension, even with high-energy
mixing. The relative efficiency of fines removal for different materials and varying operating
conditions is an area that requires further study for environmental applications.
Scalping Screen. A scalping screen removes oversize materials, such as rocks, gravel, bark,
plastic, grass, shells, and other debris. Besides being destructive to equipment and filter fabrics,
debris constitutes unnecessary treatment and storage volume when carried through the process.
A scalping screen may be fixed or rotate in a belt configuration (Figure 2). The belt
configuration permits additional capacity in a smaller footprint, and prevents the blinding of the
screen with grass and similar materials because they are dropped off the end of the belt as it
rotates.
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