The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS). The suspended solids are separated in a clarifier with recycle of the separated sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and the effluent contains 30 mg/L MLSS, find the solids retention time assuming the system is at steady-state
The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS). The suspended solids are separated in a clarifier with recycle of the separated sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and the effluent contains 30 mg/L MLSS, find the solids retention time assuming the system is at steady-state
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter4: Mechanical Processes
Section: Chapter Questions
Problem 4.2P
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The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS). The suspended solids are separated in a clarifier with recycle of the separated sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and the effluent contains 30 mg/L MLSS, find the solids retention time assuming the system is at steady-state.
![4. The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin
shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS).
The suspended solids are separated in a clarifier with recycle of the separated
sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are
wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and
the effluent contains 30 mg/L MLSS, find the solids retention time assuming the
system is at steady-state.
The variables for flow rates, Q, and MLSS concentra-
tions, X, can be placed on the schematic to help orga-
nize the solution to this problem.
VA = 10,000 gal
ХА 3 1500 mg/L
Xe = 30 mg/L
Qin = 25,000 gal/day
Qin
influent
Qu = 500 gal/day
Qr = 5000 gal/day
Xw = X, (unknown]
Q = [Qin + (a, - Qu}} – Q,
= Qin - Qw
%3D
aeration
basin
fo determine Xr, a solids balance must be taken at
he clarifier. Since the total solids entering the clarifier
nust be equal to the total solids exiting the clarifier for
teady-state flow conditions,
effluent
VA; XA
clarifier
X,
Q, - Qw
Qw
waste
Xw = X,
гecycle
(Qin + (Qr - Qu)]Xa = Q¢X¢ + Qr X,
%3!
=(Qin - Qu)Xe + QrX,](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa061449e-1e75-4fa5-9e02-82a00bd019ab%2F8aa04e1b-25bb-43c5-aa0f-adf7ee4c7dec%2Fbj575nf_processed.png&w=3840&q=75)
Transcribed Image Text:4. The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin
shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS).
The suspended solids are separated in a clarifier with recycle of the separated
sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are
wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and
the effluent contains 30 mg/L MLSS, find the solids retention time assuming the
system is at steady-state.
The variables for flow rates, Q, and MLSS concentra-
tions, X, can be placed on the schematic to help orga-
nize the solution to this problem.
VA = 10,000 gal
ХА 3 1500 mg/L
Xe = 30 mg/L
Qin = 25,000 gal/day
Qin
influent
Qu = 500 gal/day
Qr = 5000 gal/day
Xw = X, (unknown]
Q = [Qin + (a, - Qu}} – Q,
= Qin - Qw
%3D
aeration
basin
fo determine Xr, a solids balance must be taken at
he clarifier. Since the total solids entering the clarifier
nust be equal to the total solids exiting the clarifier for
teady-state flow conditions,
effluent
VA; XA
clarifier
X,
Q, - Qw
Qw
waste
Xw = X,
гecycle
(Qin + (Qr - Qu)]Xa = Q¢X¢ + Qr X,
%3!
=(Qin - Qu)Xe + QrX,
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