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Exam 3 - Summer, 2004

Exam 3 - Summer, 2004 - c Draw the curve labeling x and y...

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Introduction to Environmental Engineering CE 350 – Exam 3 Summer, 2004 Time Limit (50 minutes) 1. Define the following terms. (14 points) Procaryote Bacteria; Absent of membrane bound organelles & nucleus; unicellular organism Heterotrophic – Obtain both energy and carbon from organic matter Photoautrophic – requiring sunlight as an energy source Psychrophilic – grow best at 0 – 30 ° C Thermophilic – grow best at > 40 ° C Facultative – grow with or without oxygen Microaerophilic – grows in the presence of very small quantities of oxygen 2. Sketch a typical growth curve for bacteria as a function of temperature. (7 points)
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3. List three main differences between eutrophic and oligotrophic lakes. (6 points) 4. Draw a typical bacterial growth curve, labeling the phases. (10 points)
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5. Describe three methods used to directly or indirectly measure dissolved organic material in water. (9 points)
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6. a) What is the Monod equation? (3 points) b) How was it determined? (1 point)
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Unformatted text preview: c) Draw the curve, labeling x and y axes, K s , and μ max . (4 points) d) How does Ks relate to biodegradability? (2 points) 7. Estimate the COD, TOC and ultimate BOD, mg/L, of a solution that is made by dissolving one teaspoon of sugar, C 6 H 12 O 6 , (6 grams) in 1.00 liter of distilled water. [C = 12 g/moles, O = 16 g/moles, H = 1 g/moles] (10 points) 8. Sketch an oxygen sag curve and indicate on it: (9 points) a. The stretch of river for which rate of deoxygenation exceeds the rate of reaeration. b. The stretch of river for which rate of reaeration exceeds the rate of deoxygenation. c. The point at which the two rates are equal. 9. Calculate the number of unicellular bacteria grown from a population of 100 at time zero after 48 hours of growth. Assume that the lag period is ½ hour and the generation doubling time is 20 minutes and that exponential growth takes place for the entire growth period. (10 points) 10....
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