Using a spreadsheet program you have written, plot a graph of the final effluent BOD5 of the single-stage filter described in Problem 17-6 as a function of the influent flow rate. Assume that the ratio of recirculation flow to influent flow remains constant and that the filter diameter is 35.0 m. Use hydraulic loading rates of 10, 12, 14, 16, 18, and 20 m3/m2.
Problem 17-6
Determine the diameter of a single-stage rock media filter to reduce an applied BOD5 of 125 mg/L to 25 mg/L. Use a flow rate of 0.14 m3/s, a recirculation ratio of 12.0, and a filter depth of 1.83 m. Assume the NRC equations apply and that the wastewater temperature is 20oC.
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