A CSTR activated sludge system is being designed for the FultonFish Processing Plant. The flow is relatively small (0.25 mgd), butthe wastewater is strong due to all of the fish waste (BOD5 = 4500mg/L). Primary settling removes 20% of the BOD5. In order todischarge to the town sewer the BOD5 must be reduced to aconcentration that is 95% of the influent. What is the Dimensionsof the basin assuming a 3:1 L:W ratio. Also, what is the sludgeproduction rate?
Design Parameters
θc = 10 days
X = 2100 mg VSS/L
MLVSS is 75% of MLSS
Aeration Basin = 20 ft deep
Yobs = 0.3 mg MLSS/mg BOD5
Recycle Ratio = 50%
