(i) The average operating data for conventional activated sludge process treatment is as follows: "Sewage flow: 60,000 m³/d; Vol. of aeration tank: 18,000 m³. Influent BOD: 300 mg/L; Effluent BOD: 25 mg/L; MLSS: 2500 mg/L; Effluent suspended solids: 35 mg/L; Waste sludge suspended solids: 13,000 mg/L; Quantity of waste sludge: 300 m³/d. Calculate: (6 Marks) a) Hydraulic retention time b) Food to microorganism ratio

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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(i) The average operating data for conventional activated sludge process treatment is as follows:
"Sewage flow: 60,000 m³/d; Vol. of aeration tank: 18,000 m3.
Influent BOD: 300 mg/L; Effluent BOD: 25 mg/L; MLSS: 2500 mg/L; Effluent suspended solids: 35 mg/L; Waste
sludge suspended solids: 13,000 mg/L; Quantity of waste sludge: 300 m³/d.
Calculate: (6 Marks)
a) Hydraulic retention time
b) Food to microorganism ratio
(ii) Using a neat and labeled diagram explain the growth curve of microorganisms in batch culture. (4 Marks)
Transcribed Image Text:(i) The average operating data for conventional activated sludge process treatment is as follows: "Sewage flow: 60,000 m³/d; Vol. of aeration tank: 18,000 m3. Influent BOD: 300 mg/L; Effluent BOD: 25 mg/L; MLSS: 2500 mg/L; Effluent suspended solids: 35 mg/L; Waste sludge suspended solids: 13,000 mg/L; Quantity of waste sludge: 300 m³/d. Calculate: (6 Marks) a) Hydraulic retention time b) Food to microorganism ratio (ii) Using a neat and labeled diagram explain the growth curve of microorganisms in batch culture. (4 Marks)
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