Treat for a capacity of 100 MGD.
Although primary and secondary sedimentation is responsible for the removal of some BOD, you will design a bioreactor which removes 85% of BOD entering the plant using an activated sludge bioreactor. Use the following values: Influent (to bioreactor) BOD5 = 400 mg/L; Ks = 60 mg BOD5/L; kd = 0.06 day-1; µm = 3 day-1; Y = 0.6 mg VSS/mg BOD5.
(a) What must the hydraulic detention time be in the aeration pond?
(b) What mass of microbes will be produced in the pond each day?