1  BOD or plant loading in pounds
Concentration of BOD in mg/l
plant flow in mgd

weight of one gallon of water
lbs of BOD
mg/l x mgd x 8.34 = lbs/day

2  MLSS in the aerator in pounds

Concentration of MLSS in mg/l
volume of aeration tank in MG
lbs of MLSS
MLSS (mg/l) x vol. aerator (MG) x 8.34 = lbs of MLSS

3  F/M Ratio

   lbs BOD (or lbs MLSS) =   lbs BOD  
lbs MLSS                   Ratio    

4  Find mg/l of MLSS when required MLSS in lbs is known

mg/l MLSS =                  lbs MLSS                
vol. of aerator in mg x 8.34

5  Find percentage of BOD removed

lbs of BOD removed
      lbs BOD in

6  Detention time

tank volume x 24 hrs
plant flow

Subscribe To Our Water Solutions Newsletter

Join our mailing list to receive the latest news and updates about water treatment solutions. We'll never spam you and your private email information is safe with us.

You have Successfully Subscribed!