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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