2.50. A solution containing hazardous waste is charged into a storage tank and subjected to a chemical treatment that decomposes the waste to harmless products. The concentration of the decomposing waste, C, has been reported to vary with time according to the formula C = 1/(a + bt) When sufficient time has elapsed for the concentration to drop to o.01 g/L, the contents of the tank are discharged appropriately. The following data are taken for C and t: t(h) 1.0 2.0 3.0 4.0 5.0 C(g/L) 1.43 1.02 0.73 0.53 0.38 a. If the given formula is correct, what plot would yield a straight line that would enable you to determine the parameters a and b? b. Estimate a and b using the method of least squares (Appendix A.1) or graphics software. Check the goodness of fit by generating a plot of C versus t that shows both the measured and predicted values of C. c. Using the results of Part (b), estimate the initial concentration of the waste in the tank and the time required for C to reach its discharge level. Answer d. You should have very little confidence in the time estimated in Part (c). Explain why. e. There are potential problems with the whole waste disposal procedure. Suggest several of them. Exploratory Exercise-Research and Discover f. The problem statement includes the phrase "discharged appropriately." Recognizing that what is considered appropriate may change with time, list three different means of disposal and concerns with each.

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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The problem that is listed below need to be solved and you may access that problem via viewing them through the attached images in this request. **Question Number #2.50**

2.50. A solution containing hazardous waste is charged into a storage tank and subjected to a chemical treatment that decomposes the waste to harmless products. The concentration of
the decomposing waste, C, has been reported to vary with time according to the formula
C = 1/(a + bt)
When sufficient time has elapsed for the concentration to drop to o.01 g/L, the contents of the tank are discharged appropriately.
The following data are taken for C and t:
t(h)
1.0
2.0 3.0 4.0 5.0
C(g/L) 1.43 1.02 0.73 0.53 0.38
a. If the given formula is correct, what plot would yield a straight line that would enable you to determine the parameters a and b?
b. Estimate a and b using the method of least squares (Appendix A.1) or graphics software. Check the goodness of fit by generating a plot of C versus t that shows both the measured
and predicted values of C.
c. Using the results of Part (b), estimate the initial concentration of the waste in the tank and the time required for C to reach its discharge level.
Answer
d. You should have very little confidence in the time estimated in Part (c). Explain why.
e. There are potential problems with the whole waste disposal procedure. Suggest several of them.
Exploratory Exercise-Research and Discover
f. The problem statement includes the phrase "discharged appropriately." Recognizing that what is considered appropriate may change with time, list three different means of disposal
and concerns with each.

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