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Autotrophic Denitrification Of Groundwater In A Granular Sulfur-packed Up-flow Reactor

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Autotrophic Denitrification Of Groundwater In A Granular Sulfur-packed Up-flow Reactor

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dc.contributor.author Pan, Shih-Hui en_US
dc.date.accessioned 2007-09-17T17:07:23Z
dc.date.available 2007-09-17T17:07:23Z
dc.date.issued 2007-09-17T17:07:23Z
dc.date.submitted May 2007 en_US
dc.identifier.other DISS-1639 en_US
dc.identifier.uri http://hdl.handle.net/10106/542
dc.description.abstract Autotrophic denitrification is an effective treatment technique for nitrate removal from groundwater. Six basic elements are required for the growth of autotrophic denitrifiers: (1) electron donor, (2) electron acceptor, (3) active bacteria, (4) anoxic/anaerobic environment, (5) micronutrients, and (6) optimum pH and temperature. In this research, granular sulfur is an electron donor; nitrate is an electron acceptor; anoxic and anaerobic environment was maintained in the reactor, and micronutrients were added; pH was controlled between 6 and 9, and temperature was maintained at the room temperature (20 + 2 oC). Batch reactor and continuous up-flow reactor experiments were carried out to investigate the denitrification rate, and reaction rate kinetic constants. The observed nitrate removal corresponded to the first order reaction kinetic. The data correlation between alkalinity destruction and nitrate nitrogen reduction was linear with a slope of 3.09 mg-CaCO3 alkalinity destroyed per mg-NO3 N removed. The data correlation between sulfate production and nitrate nitrogen reduction was linear with a slope of 6.91 mg- produced per mg- removed. Based on the biologically mediated half-reaction equations, the overall reaction equations were developed. Based on the experimental data, the energy coefficients and the stoichiometry of autotrophic denitrification were developed. Finally, an analytical model based on conjugate reaction kinetic was utilized. The reaction rate constants k1 and k2 were determined from the experimental data. The model provides an analytical tool to predict the nitrate and nitrite concentrations in the effluent from the up-flow column. An example is presented to illustrate the design procedure of a sulfur-packed up-flow column. In this example a sulfur-packed up-flow column is designed to treat a given flow rate and influent concentration of nitrate nitrogen to achieve a desired degree of treatment. en_US
dc.description.sponsorship Qasim, Syed en_US
dc.language.iso EN en_US
dc.publisher Civil & Environmental Engineering en_US
dc.title Autotrophic Denitrification Of Groundwater In A Granular Sulfur-packed Up-flow Reactor en_US
dc.type Ph.D. en_US
dc.contributor.committeeChair Qasim, Syed en_US
dc.degree.department Civil & Environmental Engineering en_US
dc.degree.discipline Civil & Environmental Engineering en_US
dc.degree.grantor University of Texas at Arlington en_US
dc.degree.level doctoral en_US
dc.degree.name Ph.D. en_US
dc.identifier.externalLink https://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=970
dc.identifier.externalLinkDescription Link to Research Profiles

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