P.C. V, X, S S.C. Qs Xg, Sp Act. Sludge Basin RAS Q, S, Xp WAS Qw, Sun Xw
P.C. V, X, S S.C. Qs Xg, Sp Act. Sludge Basin RAS Q, S, Xp WAS Qw, Sun Xw
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A wastewater treatment uses an activated sludge process for secondary treatment of 0.3 m^3/s of
primary effluent. The activated sludge has a biomass concentration of 2,100 mg VSS/L, and the return
activated sludge line (also known as RAS) concentration is 10,000 mg VSS/L. The substrate concentration
in the primary effluent is 220 mg BOD5/L. The F/M ratio for the activated sludge tank is 0.52 mg BOD5 ×
mg VSS^-1 × d^-1 , and the cell residence time is 9.0 d.
primary effluent. The activated sludge has a biomass concentration of 2,100 mg VSS/L, and the return
activated sludge line (also known as RAS) concentration is 10,000 mg VSS/L. The substrate concentration
in the primary effluent is 220 mg BOD5/L. The F/M ratio for the activated sludge tank is 0.52 mg BOD5 ×
mg VSS^-1 × d^-1 , and the cell residence time is 9.0 d.
(a) What is the volume of the activated sludge tank?
(b) What is the waste line (also known as WAS) flow rate?
(c) What is the flow rate of the effluent from the entire system?
(d) What is the hydraulic residence time for the activated sludge tank? Hint: You will need to also write
a mass balance for biomass X around the secondary clarifier, and a flow balance around the secondary
clarifier, as part of the solution.
(b) What is the waste line (also known as WAS) flow rate?
(c) What is the flow rate of the effluent from the entire system?
(d) What is the hydraulic residence time for the activated sludge tank? Hint: You will need to also write
a mass balance for biomass X around the secondary clarifier, and a flow balance around the secondary
clarifier, as part of the solution.
Transcribed Image Text:P.C.
V, X, S
S.C.
2. So
Act. Sludge Basin
RAS
Q., S, X;
WAS
Qu, Sus Xw
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