A trickling filter should be constructed for the pre-treatment of municipal wastewater. The flow rate is Q0 = 105 m3 d-1 and the influent concentration is S0 = 250 mg L-1 BOD5. Two different cases should be compared (see Table 7.1):

1. Intermediate loading, supporting material: rock Load per volume Bv = 350 g m-3 d-1 BOD5 Hydraulic load w = 7 m3 m-2 d-1

2. Super-high-rate, supporting material: plastic Load per volume Bv = 1000 g m-3 d-1 BOD5

Calculate volume V, cross sectional area A and height H.

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