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dc.contributor.authorBanchuen, Tawanen_US
dc.date.accessioned2014-03-14T20:30:22Z
dc.date.available2014-03-14T20:30:22Z
dc.date.issued2002-08-26en_US
dc.identifier.otheretd-01102003-162857en_US
dc.identifier.urihttp://hdl.handle.net/10919/30882
dc.description.abstractThe CE-QUAL-W2 model has been selected as a tool for use in water quality management studies of the Occoquan Reservoir. In order for the model to achieve its best possible predictive capability, additional quantitative information on denitrification rates in the reservoir was required. A microcosm operating protocol was developed to obtain such information and also to enhance the understanding of complex nitrate-sediment-phosphorus interactions. The microcosm system developed was a biphasic system, consisting of a single continuous stirred tank reactor (CSTR), or a series of CSTRs containing representative sediment and water samples from the reservoir. The system was configured to simulate the bottom waters in the upper reaches of the reservoir during anoxic conditions. Nitrate concentrations in the microcosm system were monitored, and first-order denitrification-rate constants calculated to be used as an input to the reservoir water quality model CE-QUAL-W2. Other water chemistries were also monitored to investigate the nitrate effects on water quality. From the investigation results, it appears that the first-order denitrification-rate constant of the model should be set at 0.22 day-1 instead of the model default value. Nitrate was also observed to be removed by chemical and/or biologically mediated reduction by reduced forms of manganese. Once the nitrate was depleted, soluble manganese was released from the sediment first, followed by soluble iron. The release of phosphorus was not observed in this study after the depletion of nitrate, but nevertheless, was believed to occur. The absence of the release was attributed to phosphorus adsorption to the Plexiglas reactor walls.en_US
dc.publisherVirginia Techen_US
dc.relation.haspart(09)Lit_Rev_3.pdfen_US
dc.relation.haspart(19)AppendixE.pdfen_US
dc.relation.haspart(04)ListofFigures.pdfen_US
dc.relation.haspart(18)AppendixD.pdfen_US
dc.relation.haspart(01)Abstract.pdfen_US
dc.relation.haspart(15)AppendixA.pdfen_US
dc.relation.haspart(17)AppendixC.pdfen_US
dc.relation.haspart(12)Results&Discussion.pdfen_US
dc.relation.haspart(03)TableofContents.pdfen_US
dc.relation.haspart(20)AppendixF.pdfen_US
dc.relation.haspart(05)ListofTables.pdfen_US
dc.relation.haspart(00)Cover_Page.pdfen_US
dc.relation.haspart(11)Material&Methods.pdfen_US
dc.relation.haspart(16)AppendixB.pdfen_US
dc.relation.haspart(22)Vita.pdfen_US
dc.relation.haspart(21)AppendixG.pdfen_US
dc.relation.haspart(10)Lit_Rev_4.pdfen_US
dc.relation.haspart(14)References.pdfen_US
dc.relation.haspart(13)Summary&Conclusions.pdfen_US
dc.relation.haspart(08)Lit_Rev_2.pdfen_US
dc.relation.haspart(06)Introduction.pdfen_US
dc.relation.haspart(07)Lit_Rev_1.pdfen_US
dc.relation.haspart(02)Acknowledgements.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectOxidized Nitrogenen_US
dc.subjectNitrateen_US
dc.subjectDenitrificationen_US
dc.subjectWater Supply Reservoiren_US
dc.titleA Microcosm-Based Investigation into Oxidized Nitrogen Removal in the Hypolimnetic Waters of the Occoquan Reservoir of Northern Virginiaen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairGrizzard, Thomas J.en_US
dc.contributor.committeememberNovak, John T.en_US
dc.contributor.committeememberGodrej, Adil N.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01102003-162857/en_US
dc.date.sdate2003-01-10en_US
dc.date.rdate2004-01-22
dc.date.adate2003-01-22en_US


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