CEE 320
Assignment #8
Environmental Engineering
complete for Wednesday 24 March, 2010
PROBLEMS:
1.
Textbook Chapter 9 Problem 925 (p. 397)
2.
Textbook Chapter 9 Discussion question 93 (p. 399)
3.
Textbook Chapter 9 Discussion question 95 (p. 399)
4.
Textbook Chapter 9 Problem 940 (p. 399)
5.
Interfacial mass transfer of oxygen into a lake
Consider a lake with a mean depth of 30 m. The temperature of the lake water is 10
o
C. At some
time, the lake water contains 3 mg/L of dissolved oxygen. (Incidentally, this is below the level
needed to support most game fish).
The lake is at sea level, so the total air pressure is 1 atm. You
may assume a value of 0.027 m/h for the interfacial mass transfer constant,
k
r
, (called the reaeration
constant in your textbook), and a value of 1.6 x 10
3
M/atm for Henry’s constant at 10
o
C.
(a) What is the equilibrium mass concentration of dissolved oxygen in water in the lake?
(b) Assuming that no mechanisms change the dissolved oxygen content of the lake water other than
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 Spring '10
 MCMAHON
 interfacial mass transfer

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