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Carbon dioxide stripping in aquaculture -- part II: development of gas transfer models

Aquacultural Engineering

By:
, , and
DOI: 10.1016/j.aquaeng.2011.12.002

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Abstract

The basic mass transfer equation for gases such as oxygen and carbon dioxide can be derived from integration of the driving force equation. Because of the physical characteristics of the gas transfer processes, slightly different models are used for aerators tested under the non steady-state procedures, than for packed columns, or weirs. It is suggested that the standard condition for carbon dioxide should be 20 °C, 1 atm, CCO2=20 mg/kg, and XCO2=0.000285. The selection of the standard condition for carbon dioxide based on a fixed mole fraction ensures that standardized carbon dioxide transfer rates will be comparable even though the value of C*CO2 in the atmosphere is increasing with time. The computation of mass transfer for carbon dioxide is complicated by the impact of water depth and gas phase enrichment on the saturation concentration within the unit, although the importance of either factor depends strongly on the specific type of aerator. For some types of aerators, the most accurate gas phase model remains to be determined for carbon dioxide. The assumption that carbon dioxide can be treated as a non-reactive gas in packed columns may apply for cold acidic waters but not for warm alkaline waters.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Carbon dioxide stripping in aquaculture -- part II: development of gas transfer models
Series title:
Aquacultural Engineering
DOI:
10.1016/j.aquaeng.2011.12.002
Volume
47
Year Published:
2012
Language:
English
Publisher:
Elsevier
Publisher location:
Amsterdam, Netherlands
Contributing office(s):
Leetown Science Center
Description:
9 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Aquacultural Engineering
First page:
38
Last page:
46