environmental engineering

Using the following assumptions, determine the sludge age

and

cell wastage flow rate.

Assume:

Suspended solids in effluent negligible

Wastage is from aeration tank

, hence X = X

r

Yield coeffic

ient = 0.4

Bacterial decay rate = 0.04 1/d

 

Effluent BOD5

=10mg/L

 

F/M = 0.33 mg/mg*d

BOD5

after primary settling = 150mg/L

MLVSS = 1700mg/L

 

MLSS = 1.4(MLVSS)

 

Q = 0.0796m3/s

V = 1806 m3

 

Aeration period =

0.5d