Two 28 L continuously fed cyclically aerated sequencing batch reactors were operated at a constant sludge age and hydraulic residence time of 15 and 2, 3, 4 or 8 days, respectively, and an organic load of 7, 14 or 65 g of COD/day to investigate operation strategies to treat whey (a nitrogen unbalanced waste). The systems were equipped with a membrane filter that automatically removed effluent during the settling period. To observe performance, biomass appearance and settling behaviour under various nitrogen-limiting conditions, nitrogen was added at rates to maintain COD/N of approximately 20 to 60. / The cyclic aeration generated a selector effect in the sludge blanket and controlled bulking. The N-balanced system could be used without the membrane filter and effluent BOD and solids were below 20 mg/L and 25 mg/L, respectively. The effluent of the N-unbalanced systems had BOD below 20 mg/L but generated solids varying between 60 and 100 mg/L. The membrane filter significantly reduced the effluent solids. Moreover, the clarity of the filtrate was enhanced when the sludge bulked severely due to an excessive number of filaments.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.21329 |
| Date | January 1999 |
| Creators | Tauvette, Geoffrey Yvon. |
| Contributors | Zaloum, Ronald (advisor), Gehr, Ronald (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Civil Engineering and Applied Mechanics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001658456, proquestno: MQ50666, Theses scanned by UMI/ProQuest. |
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