Modeling Air Stripping of Ammonia in an Agitated Vessel

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A model has been developed to predict the rate of removal of ammonia (NH{sub 3}) from solution in a sparged agitated vessel. The model is first-order with respect to liquid-phase concentration of NH{sub 3}. The rate constant for the first-order equation is a function of parameters related to the vessel/impeller characteristics, the air/liquid properties as well as the process conditions. However, the vessel/impeller characteristics, the air/liquid properties, and the process conditions reduce the rate constant dependence to only three parameters, namely, the air sparge rate, the liquid volume or batch size, and the Henry's law constant of NH{sub 3} for ... continued below

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Kofi, Adu-Wusu; Martino, Christopher J.; Wilmarth, William R.; Bennett, William M. & Peters, Robert s. November 29, 2005.

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A model has been developed to predict the rate of removal of ammonia (NH{sub 3}) from solution in a sparged agitated vessel. The model is first-order with respect to liquid-phase concentration of NH{sub 3}. The rate constant for the first-order equation is a function of parameters related to the vessel/impeller characteristics, the air/liquid properties as well as the process conditions. However, the vessel/impeller characteristics, the air/liquid properties, and the process conditions reduce the rate constant dependence to only three parameters, namely, the air sparge rate, the liquid volume or batch size, and the Henry's law constant of NH{sub 3} for the liquid or solution. Thus, the rate of removal is not mass-transfer limited. High air sparge rates, high temperatures, and low liquid volumes or batch sizes increase the rate of removal of NH{sub 3} from solution. The Henry's law constant effect is somewhat reflected in the temperature since Henry's law constant increases with increasing temperature. Data obtained from actual air stripping operation agree fairly well with the model predictions.

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  • Report No.: WSRC-MS-2005-00685
  • Grant Number: DE-AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 881494
  • Archival Resource Key: ark:/67531/metadc873356

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Office of Scientific & Technical Information Technical Reports

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  • November 29, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 8:17 p.m.

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Kofi, Adu-Wusu; Martino, Christopher J.; Wilmarth, William R.; Bennett, William M. & Peters, Robert s. Modeling Air Stripping of Ammonia in an Agitated Vessel, article, November 29, 2005; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc873356/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.