4.33. A stream containing 5.15 wt% chromium, Cr, is contained in the wastewater from a metal finishing plant. The wastewater stream is fed to a treatment unit that removes 95% of the chromium in the feed and recycles it to the plant. The residual liquid stream leaving the treatment unit is sent to a waste lagoon. The treatment unit has a maximum capacity of 4500 kg wastewater/h. If wastewater leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything above 4500 kg/h) bypasses the unit and combines with the residual liquid leaving the unit, and the combined stream goes to the waste lagoon. mlkg Cr/h) [no water] 95% of Cr in feed to unit Wastewater ingtke/h} s 4500 kg/n 0.0515 kg Cr/kg mgke/h) To waste lagoon (48F (a) Without assuming a basis of calculation, draw and label a flowchart of the process (b) Wastewater leaves the finishing plant at a rate m, = 6000 kg/h. Calculate the flow rate of liquid to the waste lagoon, m(kg/h), and the mass fraction of Cr in this liquid, xe(kg Cr/kg). (c) Calculate the flow rate of liquid to the waste lagoon and the mass fraction of Cr in this liquid for m varying from 1000 kg/h to 10,000 kg/h in 1000 kg/h increments. Generate a plot of x6 versus m. (Suggestion: Use a spreadsheet for these calculations.) (d) The company has hired you as a consultant to help them determine whether or not to add capac- ity to the treatment unit to increase the recovery of chromium. What would you need to know to make this determination?
4.33. A stream containing 5.15 wt% chromium, Cr, is contained in the wastewater from a metal finishing plant. The wastewater stream is fed to a treatment unit that removes 95% of the chromium in the feed and recycles it to the plant. The residual liquid stream leaving the treatment unit is sent to a waste lagoon. The treatment unit has a maximum capacity of 4500 kg wastewater/h. If wastewater leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything above 4500 kg/h) bypasses the unit and combines with the residual liquid leaving the unit, and the combined stream goes to the waste lagoon. mlkg Cr/h) [no water] 95% of Cr in feed to unit Wastewater ingtke/h} s 4500 kg/n 0.0515 kg Cr/kg mgke/h) To waste lagoon (48F (a) Without assuming a basis of calculation, draw and label a flowchart of the process (b) Wastewater leaves the finishing plant at a rate m, = 6000 kg/h. Calculate the flow rate of liquid to the waste lagoon, m(kg/h), and the mass fraction of Cr in this liquid, xe(kg Cr/kg). (c) Calculate the flow rate of liquid to the waste lagoon and the mass fraction of Cr in this liquid for m varying from 1000 kg/h to 10,000 kg/h in 1000 kg/h increments. Generate a plot of x6 versus m. (Suggestion: Use a spreadsheet for these calculations.) (d) The company has hired you as a consultant to help them determine whether or not to add capac- ity to the treatment unit to increase the recovery of chromium. What would you need to know to make this determination?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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![4.33. A stream containing 5.15 wt % chromium, Cr, is contained in the wastewater from a metal finishing
plant. The wastewater stream is fed to a treatment unit that removes 95% of the chromium in the
feed and recycles it to the plant. The residual liquid stream leaving the treatment unit is sent to a
waste lagoon. The treatment unit has a maximum capacity of 4500 kg wastewater/h. If wastewater
leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything
above 4500 kg/h) bypasses the unit and combines with the residual liquid leaving the unit, and the
combined stream goes to the waste lagoon.
m(kg Cr/h) Ino water]
95% of Cr in feed to unit
Wastewater
mt ke/h) s 4500 kgn
0.0515 kg Cr/kg
(48F
To waste lagoon
(a) Without assuming a basis of calculation, draw and label a flowchart of the process
(b) Wastewater leaves the finishing plant at a rate m = 6000 kg/h. Calculate the flow rate of liquid
to the waste lagoon, rm(kg/h), and the mass fraction of Cr in this liquid, x6(kg Cr/kg).
(c) Calculate the flow rate of liquid to the waste lagoon and the mass fraction of Cr in this liquid for
in, varying from 1000 kg/h to 10,000 kg/h in 1000 kg/h increments. Generate a plot of xe versus
m. (Suggestion: Use a spreadsheet for these calculations.)
(d) The company has hired you as a consultant to help them determine whether or not to add capac-
ity to the treatment unit to increase the recovery of chromium. What would you need to know
to make this determination?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5a7b3638-98a1-4ddf-b21f-4385fdd939ca%2F3604766d-75e4-4b75-8153-7d6c864662ad%2F4m1uo6a_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4.33. A stream containing 5.15 wt % chromium, Cr, is contained in the wastewater from a metal finishing
plant. The wastewater stream is fed to a treatment unit that removes 95% of the chromium in the
feed and recycles it to the plant. The residual liquid stream leaving the treatment unit is sent to a
waste lagoon. The treatment unit has a maximum capacity of 4500 kg wastewater/h. If wastewater
leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything
above 4500 kg/h) bypasses the unit and combines with the residual liquid leaving the unit, and the
combined stream goes to the waste lagoon.
m(kg Cr/h) Ino water]
95% of Cr in feed to unit
Wastewater
mt ke/h) s 4500 kgn
0.0515 kg Cr/kg
(48F
To waste lagoon
(a) Without assuming a basis of calculation, draw and label a flowchart of the process
(b) Wastewater leaves the finishing plant at a rate m = 6000 kg/h. Calculate the flow rate of liquid
to the waste lagoon, rm(kg/h), and the mass fraction of Cr in this liquid, x6(kg Cr/kg).
(c) Calculate the flow rate of liquid to the waste lagoon and the mass fraction of Cr in this liquid for
in, varying from 1000 kg/h to 10,000 kg/h in 1000 kg/h increments. Generate a plot of xe versus
m. (Suggestion: Use a spreadsheet for these calculations.)
(d) The company has hired you as a consultant to help them determine whether or not to add capac-
ity to the treatment unit to increase the recovery of chromium. What would you need to know
to make this determination?
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