(Solved):    A sewage with flow rate of 40,000 m3/dayis needed to be treated by an activated sludge ...

 

 A sewage with flow rate of 40,000 m³/dayis needed to be treated by an activated sludge (AS) system with the following conditions:

• The tank volume is 12000 m³.
• Influent BOD₅ = 300 mg/L, effluent BOD₅ = 15 mg/L.
• MLSS = 2500 mg/L.
• SV₃₀  = 200 mL/L.

 

Please calculate:

1. Hydraulic retention time (HRT) in hours (hrs).
2. F/M ratio.
3. SVI.
4. To keep the F/M at 0.5, what is an appropriate MLSS level?

Q1. A sewage with flow rate of 40,000 m3/day is needed to be treated by an activated sludge (AS) system with the following conditions: Tank volume is 12000 m Influent BOD5= 300 mg/L, effluent BOD5 = 15 mg/L. MLSS = 2500 mg/L. SV30 = 200 mL/L. Please calculate: 1) Hydraulic retention time (HRT) in hours (hrs). 2) F/M ratio. 3) SVI. 4) To keep the F/M at 0.5, what is an appropriate MLSS level?