The contact stabilization activated sludge process

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dc.contributor.advisorMarais, Gerrit van Rooyenen_ZA
dc.contributor.authorAlexander, William Versfelden_ZA
dc.date.accessioned2015-03-09T13:54:11Z
dc.date.available2015-03-09T13:54:11Z
dc.date.issued1979en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractIn 1978 Ekama and Marais put forward a general model for the activated sludge process based on an energy requirement for adsorption of the nutrient onto the organisms. They briefly outlined an alternative bi-substrate hypothesis in which the energy requirement for adsorption fell away. No evidence in support of this alternative hypothesis was presented. The objective of this thesis was to investigate which of the two hypotheses gave the better description of the activated sludge process kinetics. When the adsorption hypothesis was replaced by the bi-substrate hypothesis in the general model and applied to the completely mixed activated sludge process and their predictions compared with experimental data, it was not possible to establish conclusively which hypothesis is to be preferred. As a consequence it was decided to test the two models under extreme conditions. The contact stabilization process was selected as the one presenting a most severe test of the predictive power of any hypothesis on activated sludge kinetics, and most likely therefore to establish the superiority of one hypothesis over the other. In order to obtain experimental data against which the hypotheses could be evaluated a series of laboratory scale tests on the contact stabilization process were conducted under time invariant and cyclic flow and load conditions at two temperatures, 12°C and 20°C. From a comparison of the experimentally observed and theoretically predicted data it was concluded that an additional factor had to be taken into account before a valid comparison could be made - whereas the general activated sludge theory accepted a rapid and complete enmeshment of influent particulate COD, in the contact reactor the experimental data indicated incomplete enmeshment in the short contact time available. When allowance was made for partial enmeshment in the predicted response of the system it was concluded that the bi-substrate hypothesis was superior to the adsorption one.en_ZA
dc.identifier.apacitationAlexander, W. V. (1979). <i>The contact stabilization 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/11427/12587en_ZA
dc.identifier.chicagocitationAlexander, William Versfeld. <i>"The contact stabilization activated sludge process."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1979. http://hdl.handle.net/11427/12587en_ZA
dc.identifier.citationAlexander, W. 1979. The contact stabilization activated sludge process. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Alexander, William Versfeld AB - In 1978 Ekama and Marais put forward a general model for the activated sludge process based on an energy requirement for adsorption of the nutrient onto the organisms. They briefly outlined an alternative bi-substrate hypothesis in which the energy requirement for adsorption fell away. No evidence in support of this alternative hypothesis was presented. The objective of this thesis was to investigate which of the two hypotheses gave the better description of the activated sludge process kinetics. When the adsorption hypothesis was replaced by the bi-substrate hypothesis in the general model and applied to the completely mixed activated sludge process and their predictions compared with experimental data, it was not possible to establish conclusively which hypothesis is to be preferred. As a consequence it was decided to test the two models under extreme conditions. The contact stabilization process was selected as the one presenting a most severe test of the predictive power of any hypothesis on activated sludge kinetics, and most likely therefore to establish the superiority of one hypothesis over the other. In order to obtain experimental data against which the hypotheses could be evaluated a series of laboratory scale tests on the contact stabilization process were conducted under time invariant and cyclic flow and load conditions at two temperatures, 12°C and 20°C. From a comparison of the experimentally observed and theoretically predicted data it was concluded that an additional factor had to be taken into account before a valid comparison could be made - whereas the general activated sludge theory accepted a rapid and complete enmeshment of influent particulate COD, in the contact reactor the experimental data indicated incomplete enmeshment in the short contact time available. When allowance was made for partial enmeshment in the predicted response of the system it was concluded that the bi-substrate hypothesis was superior to the adsorption one. DA - 1979 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1979 T1 - The contact stabilization activated sludge process TI - The contact stabilization activated sludge process UR - http://hdl.handle.net/11427/12587 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12587
dc.identifier.vancouvercitationAlexander WV. The contact stabilization activated sludge process. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1979 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/12587en_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.titleThe contact stabilization activated sludge processen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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