24. An activated sludge system is designed to treat 30. MLD of sewage. Based on the following information: F/M ratio = 0.5 kg BODs/kg MLSS. day 250 mg/L BOD, influent 1 10 days Mean cell residence time MLSS concentration Underflow concentration 5 000 mg/L. 10 000 mg/L 0.5 kg/kg = Y ka = 0.05 per day e

Structural Analysis
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Chapter2: Loads On Structures
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Wasterwater Engineering Civil engineering 

24. An activated sludge system is designed to treat 30 MLD of sewage.
Based on the following information:
F/M ratio
=
0.5 kg BODs/kg MLSS. day
250 mg/L
BODs influent
1
Mean cell residence time
10 days
5 000 mg/L
MLSS concentration
10 000 mg/L
Underflow concentration
Y
0.5 kg/kg
= 0.05 per day
ka
Calculate:
(i)
(ii)
(iii)
(iv)
(v)
V.
Scanned w
SKAB 292
Volume of the reactor
Hydraulic retention time
Mass of wasted sludge per day
Volumetric loading in unit kg BODs/m³. day
Sludge recycle ratio
Transcribed Image Text:24. An activated sludge system is designed to treat 30 MLD of sewage. Based on the following information: F/M ratio = 0.5 kg BODs/kg MLSS. day 250 mg/L BODs influent 1 Mean cell residence time 10 days 5 000 mg/L MLSS concentration 10 000 mg/L Underflow concentration Y 0.5 kg/kg = 0.05 per day ka Calculate: (i) (ii) (iii) (iv) (v) V. Scanned w SKAB 292 Volume of the reactor Hydraulic retention time Mass of wasted sludge per day Volumetric loading in unit kg BODs/m³. day Sludge recycle ratio
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