An activated sludge system has a single aeration basin with a volume of 300,000 gal and 2 - 25 ft. diameter secondary clarifiers. The influent flow is 1.1 MGD and the influent BOD5 and TSS are 160 mg/L and 190 mg/L respectively. The mixed liquor suspended solids concentration is 2500 mg/L and the recycle suspended solids concentration is 6800 mg/L. The sludge recycle flow rate is 0.60 MGD and the solids residence time is 9 days. (1 gallon = 3.79L)
A. Calculate the volumetric BODs loading rate on the acration basin in units of lbs/1000 ft.
B. Calculate the F:M ratio in units of g-B0Ds/g-TSS.