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dc.contributor.authorBeck, Jason Leeen_US
dc.date.accessioned2014-03-14T20:47:28Z
dc.date.available2014-03-14T20:47:28Z
dc.date.issued2007-10-22en_US
dc.identifier.otheretd-11042007-234141en_US
dc.identifier.urihttp://hdl.handle.net/10919/35593
dc.description.abstractA pilot scale nitrogen (N) removal system was constructed and operated for approximately 365 days and was designed to remove inorganic total ammonia nitrogen (TAN) from solids-separated dairy manure. An anaerobic fermenter, upstream of the N removal reactor, produced volatile fatty acids (VFAs), to be used as an electron donor to fuel denitrification, and TAN at a COD:N ratio of 18:1. However, sufficient amounts of non-VFA COD was produced by the fermenter to fuel the denitrification reaction at an average NO3- removal rate of 5.3 ± 2 mg/L NO3--N. Total ammonia N was removed from the fermenter effluent in an N removal reactor where a series of aerobic and anoxic zones facilitated aerobic TAN oxidation and anoxic NO3- and NO2- reduction. The minimum dissolved oxygen (DO) concentration allowing for complete TAN removal was found to be 0.8 mg/L. However, TAN removal rates were less than predicted using default nitrifying kinetic parameters in BioWin®, a biological modeling simulator, which indicated the presence of a nitrification inhibitor in fermented dairy manure. Furthermore, an N balance during the aerobic zone indicated that simultaneous nitrification-denitrification (SND) was occurring in the aerobic zone of the N removal reactor and was most apparent at DO concentrations below 1.3 mg/L. A series of nitrite generation rate (NGR) experiments confirmed the presence of an inhibitor in fermented dairy manure. A model sensitivity analysis determined that the most sensitive ammonia oxidizing bacteria (AOB) kinetic parameters were the maximum specific growth rate, , and the substrate half saturation coefficient, . Nitrifying inhibition terms of competitive, non-competitive, mixed competitive, and un-competitive were applied to the growth rate equation in BioWin® but an accurate representation of the observed TAN removal rates in the pilot scale system could not be found by adjusting the kinetic parameters alone. Reducing the default BioWin® hydrolysis rate by approximately 50% produced a more accurate calibration for all inhibition terms tested indicating that the hydrolyization of organic N in dairy manure is less than typical municipal waste water.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartJasonBeckMastersThesis041308.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.subjectnitrification inhibitionen_US
dc.subjectfermented dairy manureen_US
dc.subjectNGRen_US
dc.subjectdairy manureen_US
dc.subjectinhibition mechanismsen_US
dc.subjectnitritationen_US
dc.subjectnitrificationen_US
dc.subjectN removalen_US
dc.subjectdenitrificationen_US
dc.subjectdairy manure treatmenten_US
dc.subjectsimultaneous nitrification denitrificationen_US
dc.titleOptimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygenen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairLove, Nancy G.en_US
dc.contributor.committeememberKnowlton, Katharine F.en_US
dc.contributor.committeememberOgejo, Jactone Arogoen_US
dc.contributor.committeememberMarr, Linsey C.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11042007-234141/en_US
dc.date.sdate2007-11-04en_US
dc.date.rdate2008-04-14
dc.date.adate2008-04-14en_US


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