Biomass yield (Y )
Y represents the biomass yield, i.e., how biomass
is produced against substrate utilized. The value of
Y recorded for this study came out to be 0.714 mg
VSS/mg sBOD. The range of Y is 0.4–0.8 mg
VSS/mg BOD for domestic wastewater and for cheese
processing wastewater its value is 0.20 mg VSS/mg
COD9. The significance of Y in process design is that
it gives an estimate of the sludge produced as a result
of wastewater treatment. The greater the value of Y ,
the greater will be the amount of sludge, and the size
of sludge handling facility. Preliminary cost estimates
for sludge handling can be found out once the size is
known