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The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge
Bibliography: pages 61-2.
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2016
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| _version_ | 1867613307620294656 |
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| access_status_str | Open Access |
| author | Izzett, Hilton |
| author2 | Ekama, George A |
| author_browse | Ekama, George A Izzett, Hilton |
| author_facet | Ekama, George A Izzett, Hilton |
| author_sort | Izzett, Hilton |
| collection | Thesis |
| description | Bibliography: pages 61-2. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21764 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:03.682Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/21764 The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge Izzett, Hilton Ekama, George A Civil Engineering Bibliography: pages 61-2. In a time when the world is becoming more environmentally conscious, and is looking for simple, efficient, economical, and environmentally friendly solutions to sewage and sludge treatment, the dual digestion system presents itself as an attractive alternative to other sludge treatment systems. The dual digestion system comprises an autoheated thermophilic (55-65°C) aerobic first stage and a mesophilic (37°C) anaerobic second stage. Past research into the dual digestion system has given rise, inter alia, to the following claims (de Villiers, et al, 1991): a) sludge disinfection and stabilisation occur in one process - disinfection .in the thermophilic aerobic first stage and stabilisation in the anaerobic second stage. b) the stability of the anaerobic stage is considerably 'improved by the increase in H2C03 * alkalinity and pH in the aerobic stage. c) in the aerobic stage the sludge is aerobically or thermally pretreated (conditioned) making it more readily digestible under anaerobic conditions, thereby allowing significantly reduced retention times from 25 to 30 days for normal digestion, to 8 to 10 days. Messenger (1991), in a full scale investigation at the Potsdam Wastewater Treatment Plant in Milnerton, Cape Town, verified claims (a) and (b), but was unable to verify claim ( c) above. It was the intention in this investigation to verify this claim at full scale using the existing dual digestion plant at Milnerton. However, after 9 months of starting up the plant, the fiberglass aerobic tank failed structurally along one of its seams. This failure was so extensive that the plant could not be started up again and the research project was terminated. The failure of the aerobic reactor necessitated continuing this thesis investigation in the laboratory. 2016-09-14T12:56:55Z 2016-09-14T12:56:55Z 1992 Master Thesis Masters MSc http://hdl.handle.net/11427/21764 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering Izzett, Hilton The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| thesis_degree_str | Master's |
| title | The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| title_full | The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| title_fullStr | The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| title_full_unstemmed | The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| title_short | The effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| title_sort | effect of thermophilic heat treatment on the anaerobic digestibility of primary sludge |
| topic | Civil Engineering |
| url | http://hdl.handle.net/11427/21764 |
| work_keys_str_mv | AT izzetthilton theeffectofthermophilicheattreatmentontheanaerobicdigestibilityofprimarysludge AT izzetthilton effectofthermophilicheattreatmentontheanaerobicdigestibilityofprimarysludge |