Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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Question
Q3 A pollutant is removed from wastewater using countercurrent air flow in a packed absorption tower. The wastewater feed rate is 100 m³ hour 1. The pollutant concentration in the influent is 150 μg 1-¹. The pollutant concentration in the effluent is 20 µg 1-¹. The injected air is free of the pollutant. The volume of the packed tower is 5 m³. The Henry's law coefficient for the pollutant in water is 2.3. The air flow rate is 2000 m³ hour ¹. (a) Determine the pollutant concentration in the effluent, that you would expect if the wastewater feed rate is increased to 300 m³ hour -1. (b) Determine the volume of packed bed required to treat wastewater at 300 m³ hour the pollutant concentration in the effluent at 20 μg 1-¹. whilst maintaining (c) Determine the mass rate of pollutant absorbed per unit volume of packed bed for (i) the original scenario, (ii) the scenario described in part (a) and (iii) the scenario described in part (b).
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Transcribed Image Text:Q3 A pollutant is removed from wastewater using countercurrent air flow in a packed absorption tower. The wastewater feed rate is 100 m³ hour 1. The pollutant concentration in the influent is 150 μg 1-¹. The pollutant concentration in the effluent is 20 µg 1-¹. The injected air is free of the pollutant. The volume of the packed tower is 5 m³. The Henry's law coefficient for the pollutant in water is 2.3. The air flow rate is 2000 m³ hour ¹. (a) Determine the pollutant concentration in the effluent, that you would expect if the wastewater feed rate is increased to 300 m³ hour -1. (b) Determine the volume of packed bed required to treat wastewater at 300 m³ hour the pollutant concentration in the effluent at 20 μg 1-¹. whilst maintaining (c) Determine the mass rate of pollutant absorbed per unit volume of packed bed for (i) the original scenario, (ii) the scenario described in part (a) and (iii) the scenario described in part (b).
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