CEE 320 Assignment #8 Environmental Engineering complete for Wednesday 24 March, 2010PROBLEMS: 1. Textbook Chapter 9 Problem 9-25 (p. 397) 2. Textbook Chapter 9 Discussion question 9-3 (p. 399) 3. Textbook Chapter 9 Discussion question 9-5 (p. 399) 4. Textbook Chapter 9 Problem 9-40 (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 10oC. 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, kr, (called the reaeration constant in your textbook), and a value of 1.6 x 10-3M/atm for Henry’s constant at 10oC. (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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