Measurement and Modeling of Nitrate-Nitrogen Transport in Subsurface Bioreactors
Chun, Jong Ahn
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https://hdl.handle.net/2142/86071
Description
Title
Measurement and Modeling of Nitrate-Nitrogen Transport in Subsurface Bioreactors
Author(s)
Chun, Jong Ahn
Issue Date
2007
Doctoral Committee Chair(s)
Cooke, Richard A.
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Language
eng
Abstract
A field-scale bioreactor (6.1 m by 6.1 m) installed by researchers in the Agricultural and Biological Engineering Department of University of Illinois at Urbana-Champaign was selected for this study. The nitrate-N concentrations of the bioreactor were monitored in 16 monitoring wells installed at 1.5 m intervals and 0.76 m from each corner. A Finite Element Method routine was used for transient, two-dimensional groundwater flow, and the Random Walk Method was used for two-dimensional nitrate-N transport. The storage coefficient, the dispersivity and the first-order decay coefficient were estimated as 0.18 cm-1, 0.86, 16.7 cm, and 0.2 hr-1, respectively through a nonlinear regression approach. The results of this study will lead to a better understanding of nitrate-N transport through bioreactors, and consequently, the development of design standards and operating protocols for field-scale systems.
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