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October 7, 2020

Determine the diameter (ft) of the high-rate trickling filter system.

A two-stage high-rate trickling filter with 200% recycle will be used to treat 5.0 million gallons per day (MGD). The influent BOD to the primary clarifier is 225 mg/L and the primary removes 30% of the incoming BOD. The effluent BOD should be 20 mg/L or less. Assume that the design BOD loading to the trickling filter system is 40 lb BOD/(d⋅1,000 ft3) and a depth of 6 ft will be used. Use the NRC equations for designing the trickling filter system, and assume that there are two treatment trains operating in parallel. Determine:

a. The diameter (ft) of the high-rate trickling filter system.

b. The effluent BOD concentration (mg/L).

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