PS11_Sp10 - Data: Tank height H = 3 m Tank length L = 20 m...

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CEE 320 Assignment #11 Environmental Engineering Complete by W 21 April, 2010 PROBLEMS: NOTE: Some of the assigned problems are CHAPTER REVIEW QUESTIONS. Be sure you understand which question should be answered. Refer to the page number given if necessary. 1. Textbook Chapter 11 Review 1 (p. 516) 2. Textbook Chapter 11 Review 2 (p. 516) 3. Textbook Chapter 11 Review 19 (p. 516) 4. Textbook Chapter 11 Problem 11-1 (p. 517) 5. Sedimentation basin particle removal efficiency A source water to be used for drinking water contains an excessively high concentration of particles that cause the water to appear turbid. Your assignment is to design a tank to achieve 80% removal of 20 μ m-diameter particles using sedimentation. The tank height and length is constrained to the values given below due to the plant configuration. You must specify a tank width. Assume the fluid velocity in the tank will be uniform.
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Unformatted text preview: Data: Tank height H = 3 m Tank length L = 20 m Particle diameter d p = 20 m Particle density = 2.5 g cm-3 . Design flow rate Q = 1.5 m 3 s-1 (a) Calculate the tank width needed to achieve the desired removal of 20 m-diameter particles (80%). Give your answer in meters. (b) What is the overflow rate for the tank you designed in part (a)? (c) The water also contains particles that are 10 m in diameter. Identify an alternative process to remove these smaller particles from the water. 6. Primary versus secondary air pollutants (a) State the distinction between primary and secondary air pollutants. (b) What is the significance of this distinction for air quality engineering? (c) For each of the following pollutants, state whether they are primary, secondary, or both. Briefly justify your answers. (i) Soot (ii) HCHO (formaldehyde) (iii) NO 2 READING: Chapter 12: pp 524-555...
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