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8.34 CHAPTER EIGHT
where H = height of the top edge of the trough above the fluidized bed and S = center-
to-center spacing of the troughs. Troughs are usually made of fiberglass-reinforced plas-
tic (FRP), stainless steel, or reinforced concrete. Troughs made of FRP and stainless steel
usually have semicircular bottoms, and concrete troughs have V-shaped bottoms. Trough
bottoms should not be flat because froth and sludge tend to accumulate and fall back onto
the surface of filter media. Typical trough cross sections, including two with special baf-
fled plates for concurrent air/water wash, are shown in Figure 8.19.
a. Fiberglass-reinforced plastic trough. b. Reinforced concrete trough.
c. Engineered Stainless Steel Design (ESSD TM) wash trough with Type II
MULTIWASHR separator baffes. (Source: GeneralFilter
Company.)
d. ScourGuard R baffled wash trough. (Courtesy of Eimco
Water Technologies.)
FIGURE 8.19 Typical washwater trough cross sections.
