Air Stripping-HW - ENV 6015 Gas Liquid Homework Dr. J. S....

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ENV 6015 Gas Liquid Homework Dr. J. S. Taylor, P.E. Name_________________ 1. A batch-oxygen-transfer experiment is run using a full-scale aeration basin (4 m deep and 20 m 2 ). The wastewater was initially deoxygenated with excess sodium sulfite, and oxygen transfer was measured by the increase in sulfate concentration. Aeration was through a set of porous plates placed in the tank bottom. Data from the experiment are given in Table 1. Assuming that the tank behaves as an approximate ideal CMSTR, determine the proper air input rate in L/s to maintain 1 mg/1 oxygen in the system. Expected flow rate is 50 1/s and the expected influent and effluent COD concentrations are 350 and 60 mg/1, respectively. The O 2 utilized/COD-removed ratio is 0.4. Saturation concentration of oxygen in the wastewater is 7.4 mg/1. Table 1. Sulfate Concentration (mg/L) for Varying Reaction Times Time, min. 540 L/s 1080 L/s 2160 L/s 4320 L/s 0 26.0 26.0 26.0 26.0 1 28.9 32.1 40.4 60.9 2 31.9 38.3 54.8 95.8 3 34.8 44.4 69.2 130.7 4 37.7 50.5 83.5 165.6 5 40.6 56.6 97.9 200.5 7 46.5 68.9 126.7 270.3 10 55.3 87.3 169.9 375.0
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2. Data for gas stripping of H 2 S was obtained using a packed test column. The column is eight foot tall, and one foot diameter. Gas flow rate was constant atm. 23.81 ft /hr and three liquid flows, q = .467 gpm, Q = .633 gpm, and Q = 0.700 gpm. The liquid is feed at the top of the tower, with sample port 1 located 6 feet from the bottom of the column, sample port 2 located 4 feet from the bottom, and sample port 3 located 2 feet from the bottom. The effluent is the liquid leaving the bottom of the column. Plot K
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This note was uploaded on 01/14/2012 for the course ENV 6015 taught by Professor Taylor during the Fall '11 term at University of Central Florida.

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Air Stripping-HW - ENV 6015 Gas Liquid Homework Dr. J. S....

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