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A wastewater flow having the following characteristics is to be treated in aperfectly mixed flow activated-sludge system.
A wastewater flow having the following characteristics is to be treated in aperfectly mixed flow activated-sludge system.
Flow = 18,300 m3/d
Influent BOD = 160 mg/L
Effluent BOD = 5 mg/L
Cell yield coefficient Y = (0.5 kg biomass)/(kg BOD utilized)
Endogenous decay coefficient kd = 0.04 d-1
The reactor is to operate at a concentration of 3000 mg/L mixed-liquor volatile suspended solids (MLVSS), and the secondary clarifier is designed to thicken the sludge to 12,000 mg/L. For a mean cell-residence time of 8 d, determine:
(a) The volume of the reactor
(b) The mass of the solids and the wet volume of sludge wasted each day
(c) The sludge recycle ratio
