Example 144

Problem: A trickling filter 90 ft in diameter is operated with a primary effluent of 0.488 MGD and a recirculated effluent flow rate of 0.566 MGD. Calculate the hydraulic loading rate on the filter in gpd/ft2.

Solution: The primary effluent and recirculated trickling filter effluent are applied together across the surface of the filter; therefore,

Circular surface area = 0.785 x (Diameter)2 = 0.785 x (90 ft)2 = 6359 ft2

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