HW 6 - A slug of tracer(NaBr is added to the reactor and allowed to wash out over time The flow to the reactor is 10,000 L/d and the reactor volume

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53:050 Natural Environmental Systems Homework Assignment No. 6 – Spring 2011 Due Friday March 4 at 8:30 am 1. Problem 4-5 in Davis and Masten. Since the answer is given you need to make sure you show all work used to arrive at your answer. 2. Problem 4-16 in Davis and Masten. Since the answer is given you need to make sure you show all work used to arrive at your answer. 3. Problem 4-18 in Davis and Masten. 4. Problem 4-22 in Davis and Masten. Since the answer is given you need to make sure you show all work used to arrive at your answer. 5. Problem 4-24 in Davis and Masten. Since the answer is given you need to make sure you show all work used to arrive at your answer. 6. Problem 4-29 in Davis and Masten. Hint: use the mass-balance approach developed in class. 7. A completely mixed reactor (CSTR, CMFR) is to be used to treat an industrial wastewater. (a) A tracer study is conducted to determine the true hydraulic residence time of the reactor.
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Unformatted text preview: A slug of tracer (NaBr) is added to the reactor and allowed to wash out over time. The flow to the reactor is 10,000 L/d and the reactor volume is 40,000 L. The tracer data are given below. Using our mass-balance approach, determine the true hydraulic residence time of the reactor. time (day) tracer concentration (mg/L) time (day) tracer concentration (mg/L) 50 6 2.5 1 30 7 1.5 2 18 8 0.9 3 11 9 0.6 4 6.8 10 0.3 5 4.1 (b) If the pollutant to be removed has a concentration of 100 mg/L and decays by 1 st-order kinetics with a rate coefficient of 2.25 d-1 , what percent removal is achieved if one uses the theoretical hydraulic retention time of the reactor? (c) What percent removal is achieved using the true hydraulic residence time determined in part (a) of this problem?...
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This note was uploaded on 06/03/2011 for the course 53 50 taught by Professor Parkin during the Spring '11 term at University of Iowa.

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