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A municipal wastewater having a BOD5 of 225 mg/L is to be treated by a two-stage...

A municipal wastewater having a BOD5 of 225 mg/L is to be treated by a two-stage trickling filter. The desired effluent quality is 30 mg/L of BOD5. If both of the filter depths are to be 1.83 m and the recirculation ratio is 2:1, find the required filter diameters if both the two trickling filers have same removal efficiencies. Use NRC equation and the following design assumptions. Design assumptions:

o Influent flow = 10,000 m3 /d

o Recirculation ratio = 1.8

o Depth of media = 2 m

o Water temperature = 22°C

o BOD removal in primary sedimentation = 30%

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