Nitrification and denitrification kinetics in the activated sludge process

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dc.contributor.advisorMarais, Gerrit van Rooyenen_ZA
dc.contributor.authorVan Haandel, Adrianus Corneliusen_ZA
dc.date.accessioned2015-12-08T06:53:45Z
dc.date.available2015-12-08T06:53:45Z
dc.date.issued1981en_ZA
dc.descriptionIncludes bibliography.en_ZA
dc.description.abstractThe bi-substrate active-site death regeneration model, developed by Dold, Ekama and Marais (1980), to describe the aerobic activated sludge process, was extended to provide a reliable description of the behaviour of the nitrification-denitrification single sludge activated sludge process under constant, cyclic or unsteady conditions of flow and load. The extended model applies to series reactor systems containing aerated and non-aerated reactors and to single reactor systems having alternating aerated and non-aerated periods. The extension describing the behaviour in the anoxic state required no change in the basic equations describing the aerobic state. The numerical values of the kinetic constants in the anoxic state equations were found to be the same as those in the aerobic state equations, except for one: The value of the utilization rate constant for slowly biodegradable material in an anoxic environment is a fraction of approximately 0,38 of the value of this constant in an aerobic environment. Nitrification is affected in so far that growth of nitrifiers takes place in an aerobic environment, whereas death of nitrifiers takes place in both aerobic and anoxic environments. The existing empirical denitrification models (valid for constant flow and load conditions) could be deduced from the solutions of the basic equations. The empirical denitrification rate constants could be interpreted in terms of the expressions for utilization of easily and slowly biodegradable organic substrates in an anoxic environment. These constants were shown to have no fundamental kinetic significance; they are only apparent constants, the result of kinetic reactions which, fortuitously, show little variation under normal operational conditions.en_ZA
dc.identifier.apacitationVan Haandel, A. C. (1981). <i>Nitrification and denitrification kinetics in the activated sludge process</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/15664en_ZA
dc.identifier.chicagocitationVan Haandel, Adrianus Cornelius. <i>"Nitrification and denitrification kinetics in the activated sludge process."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1981. http://hdl.handle.net/11427/15664en_ZA
dc.identifier.citationVan Haandel, A. 1981. Nitrification and denitrification kinetics in the activated sludge process. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Van Haandel, Adrianus Cornelius AB - The bi-substrate active-site death regeneration model, developed by Dold, Ekama and Marais (1980), to describe the aerobic activated sludge process, was extended to provide a reliable description of the behaviour of the nitrification-denitrification single sludge activated sludge process under constant, cyclic or unsteady conditions of flow and load. The extended model applies to series reactor systems containing aerated and non-aerated reactors and to single reactor systems having alternating aerated and non-aerated periods. The extension describing the behaviour in the anoxic state required no change in the basic equations describing the aerobic state. The numerical values of the kinetic constants in the anoxic state equations were found to be the same as those in the aerobic state equations, except for one: The value of the utilization rate constant for slowly biodegradable material in an anoxic environment is a fraction of approximately 0,38 of the value of this constant in an aerobic environment. Nitrification is affected in so far that growth of nitrifiers takes place in an aerobic environment, whereas death of nitrifiers takes place in both aerobic and anoxic environments. The existing empirical denitrification models (valid for constant flow and load conditions) could be deduced from the solutions of the basic equations. The empirical denitrification rate constants could be interpreted in terms of the expressions for utilization of easily and slowly biodegradable organic substrates in an anoxic environment. These constants were shown to have no fundamental kinetic significance; they are only apparent constants, the result of kinetic reactions which, fortuitously, show little variation under normal operational conditions. DA - 1981 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1981 T1 - Nitrification and denitrification kinetics in the activated sludge process TI - Nitrification and denitrification kinetics in the activated sludge process UR - http://hdl.handle.net/11427/15664 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/15664
dc.identifier.vancouvercitationVan Haandel AC. Nitrification and denitrification kinetics in the activated sludge process. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1981 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/15664en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Civil Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherCivil Engineeringen_ZA
dc.titleNitrification and denitrification kinetics in the activated sludge processen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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