Engineering, 20.04.2020 22:35 Cocco

A 500-bed hospital has a small activated sludge wastewater treatment device. The average wastewater flow is 1200 L/day per bed. The average soluble BOD5 after primary settling is 500mg/L. The aeration tank has a liquid dimension of 10 m wide * 10m long 4.5m deep. The parameters are as follows: MLVSS-2000 mg /L MLSS = 2400 mg /L .Return sludge concentration 12000 mg VSS /L Wastage sludge concentration is same with return sludge Suspended solids in effluent 30 mg /L Bacterial decay rate 0.06/d Yield coefficient 0.42 inert fraction of suspended solids :-67% · .Allowable BOD in effluent 30 mg/L Determine

a) Aeration period in hrs
b) Solid retention time required (in days)
c) Sludge wastage flow rate

Answers: 1

Show answers

Another question on Engineering

Engineering, 03.07.2019 14:10

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Answers: 1

Answer

Engineering, 03.07.2019 14:10

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Answers: 3

Answer

Engineering, 03.07.2019 14:10

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Answers: 2

Answer

Engineering, 03.07.2019 15:10

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Answers: 1

Answer

You know the right answer?

A 500-bed hospital has a small activated sludge wastewater treatment device. The average wastewater...

Questions