Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The contact stabilization activated sludge process
Includes bibliographical references.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Civil Engineering
2015
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867614504807825408 |
|---|---|
| access_status_str | Open Access |
| author | Alexander, William Versfeld |
| author2 | Marais, Gerrit van Rooyen |
| author_browse | Alexander, William Versfeld Marais, Gerrit van Rooyen |
| author_facet | Marais, Gerrit van Rooyen Alexander, William Versfeld |
| author_sort | Alexander, William Versfeld |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12587 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:53:06.183Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Civil Engineering |
| publisherStr | Department of Civil Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/12587 The contact stabilization activated sludge process Alexander, William Versfeld Marais, Gerrit van Rooyen Civil Engineering Includes bibliographical references. 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. 2015-03-09T13:54:11Z 2015-03-09T13:54:11Z 1979 Master Thesis Masters MSc http://hdl.handle.net/11427/12587 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering Alexander, William Versfeld The contact stabilization activated sludge process |
| thesis_degree_str | Master's |
| title | The contact stabilization activated sludge process |
| title_full | The contact stabilization activated sludge process |
| title_fullStr | The contact stabilization activated sludge process |
| title_full_unstemmed | The contact stabilization activated sludge process |
| title_short | The contact stabilization activated sludge process |
| title_sort | contact stabilization activated sludge process |
| topic | Civil Engineering |
| url | http://hdl.handle.net/11427/12587 |
| work_keys_str_mv | AT alexanderwilliamversfeld thecontactstabilizationactivatedsludgeprocess AT alexanderwilliamversfeld contactstabilizationactivatedsludgeprocess |