{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/86071"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/86071","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Measurement and Modeling of Nitrate-Nitrogen Transport in Subsurface Bioreactors","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Chun, Jong Ahn"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agricultural Engineering","degree_department":null,"school":null,"contributors":["Cooke, Richard A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T14:53:51Z","date_published":"2015-09-28T14:53:51Z","updated_at":"2026-07-22T22:26:26Z","subjects":["Engineering, Agricultural"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3301117"],"render_values":[{"text":"(MiAaPQ)AAI3301117","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/86071","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cooke, Richard A."]},{"key":"dc:creator","label":"Author","values":["Chun, Jong Ahn"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T14:53:51Z","10000-01-01","2007"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Agricultural Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Agricultural"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/86071","(MiAaPQ)AAI3301117"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Made available in DSpace on 2015-09-28T14:53:51Z (GMT). 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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.","Made available in DSpace on 2015-09-28T14:53:51Z (GMT). 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