Owrate of 30000 m³/day and influent BOD of 250 mg/L. The first and composed of three and two filters, respectively, with the diamete circulation flowrates shown in the figure. If each of the five filters has a d m, find the BOD of the final effluent (S.2).

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Sanitary engineering
Fig.2 shows a two-stage trickling filtration system that treats sewage at an average
flowrate of 30000 m³/day and influent BOD of 250 mg/L. The first and second stages
are composed of three and two filters, respectively, with the diameters and
recirculation flowrates shown in the figure. If each of the five filters has a depth of
2.4 m, find the BOD of the final effluent (S.2).
Q=30000 m³/day
S=250 mg/l
Qr=25000 m³/day
Ø25m
Qr=25000 m³/day
Ø25m
Qr=25000 m³/day
Ø25m
1st stage TF
Qr=20000 m³/day
-020m.
Qr-20000 m³/day
Ø20m
2 stage TF
S₂₂-7 mg/
Transcribed Image Text:Fig.2 shows a two-stage trickling filtration system that treats sewage at an average flowrate of 30000 m³/day and influent BOD of 250 mg/L. The first and second stages are composed of three and two filters, respectively, with the diameters and recirculation flowrates shown in the figure. If each of the five filters has a depth of 2.4 m, find the BOD of the final effluent (S.2). Q=30000 m³/day S=250 mg/l Qr=25000 m³/day Ø25m Qr=25000 m³/day Ø25m Qr=25000 m³/day Ø25m 1st stage TF Qr=20000 m³/day -020m. Qr-20000 m³/day Ø20m 2 stage TF S₂₂-7 mg/
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