CE 453- HW 3- '09

CE 453- HW 3- '09 - b) Discuss the mechanisms associated...

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CE 453 Homework 3 Due: September 16, 2009 1. Do Problem 2-12 in textbook. 2. Do Problem 2-11 in textbook. (Note: calcium, magnesium, and alkalinity are expressed as mg/l of calcium carbonate). 3. Do Problems 3-3 in textbook. 4. Do Problem 3-9 in textbook 5. What is the role and function of heterotrophic bacteria in the aeration tank of a biological wastewater treatment plant? 6. What is the role and function of autotrophic bacteria in the aeration tank of a biological wastewater treatment plant? 7. Consider the crown corrosion of sewer pipe: a) Which groups of bacteria cause sewer pipe corrosion?
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Unformatted text preview: b) Discuss the mechanisms associated with this corrosion, and c) Discuss different method for solving sewer corrosion problem. 8. Iron bacteria usually cause two major problems for water engineers (foul tasting water and corrosion). Consider the corrosion problem and answer the following: a) What is the cause of corrosion in iron pipes transporting drinking water? b) How would you prevent the interior part of the pipes from getting corroded? Explain. c) How would you prevent the exterior part of the pipe from getting corroded? Explain....
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This note was uploaded on 12/14/2009 for the course CE 453 at USC.

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