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A trickling filter plant consists of a primary sedimentation tank, a trickling filter 21 m in...

  1. A trickling filter plant consists of a primary sedimentation tank, a trickling filter 21 m in diameter and 2 m depth, and a secondary sedimentation tank. The primary effluent BOD is 100 mg/L, the plant final effluent is 25 mg/L and the recirculation flow is 0.5 of the wastewater flow entering the plant. The temperature of the water is 15oC. The constants for the random plastic media are n = 0.5 and   k20 = 0.055 min-1. Calculate the hydraulic loading.
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Answer #1

Volume = =692,721.18 litres

Sewage flow = 692,721.18 litres/day

Total B.O.D.5 present in sewage = 100mg/l x 692,721.18 litres/day x 10-6=69.27 kg/day

Volume of Filter media required=

Orginal Loading= .099 kg/m3day

Surface area required for the filter=

=

Hydraulic Loading= 2000l/m2day

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