Given a CFSTR activated sludge process with recycle, that wastes the excess sludge from the recycle line, has the following operational characteristics.

Q = 10 MGD. X = 3,000 mg MLSS/L

COD from primary treatment = 180 mg/l. Xr = 9,000 mg/l MLSS/L

Influent TKN = 40 mg/l as N Xe = 15 mg/l TSS

COD in effluent = 23 mg/l. MLVSS/MLSS = 0.72

max = 2.0/day. Ks = 100 mg/l

Y = 0.6 mg MLVSS/mg COD SRT = 8 days

Kd = 0.1/day

(5)Draw and label a diagram of the process

(5) Find the total COD and soluble COD leaving the process.

(5) Find the volume and HRT (hrs) RT Hof the reactor watch your units.

(5) How does given SRT compare the minimum SRT (based on kinetics alone).

(7) Assuming 80% Nitrification of influent TKN estimate the total daily oxygen demand assuming (Need to Find Px)

(8) Discuss the five potential sources of sludge production (Px) in the treatment system.