An average operating data for conventional activated sludge treatment plant is as follows:

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teamques10 ★ 69k

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Waste water flow= 35000 m $^3$ /day
Volume of aeration tank= 10900 m $^3$
Influent BOD= 250 mg/l
Effluent BOD= 20 mg/l
Mixed liquor suspended solids(MLSS)= 2500 mg/L
Effluent suspended solids= 30 mg/l
Waste sludge suspended solids= 9700 mg/l
Quality of waste sludge= 220 m $^3$ /d
Based on the information above, determine:

i) Aeration period (hours)
ii) Food to micro-organisms ratio (F/M) (kg BOD per day/kg MLSS)
iii) Percentage efficiency of BOD removal
iv) Sludge age

environmental engineering

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