An annular photo-reactor was designed to investigate precursors and mechanisms thought to promote the fouling of ultra-violet lamps in wastewater disinfection systems. Parameters investigated included temperature of the fouling surface (quartz sleeve) and average fluence applied to the wastewater under irradiation. The reactor was designed to independently control and monitor variations of these parameters. For experimentation, these parameters were manipulated individually and in various combinations to be able to separate those factor(s) that could affect the fouling potential of the system. / The compact and mobile unit utilized a standard low-pressure mercury UV lamp surrounded by two concentric sleeves. The annulus immediately surrounding the lamp was used to control temperature (10--50°C) and fluence (10--100 mJ/cm2 using a chemical transmission filter) emitted by the lamp. The outer annulus was used for the passage and irradiation of wastewater flowing at 10--12 L/min (Re ≅ 1,000). A quartz sleeve separated these annuli. / Hydraulic and heat transfer properties of the unit were fully characterized, and the stability of system operations was confirmed. Optimal lamp UV output approached 3 mW/cm2 and maximum skin temperatures were 45°C. A cupric sulfate solution (0--2 g/L) in distilled water was determined to be the most stable transmission filter. Application of temperature and fluence control revealed that both parameters influenced the disinfection potential of the unit (achieving 1--4 log reduction of fecal coliforms). Collimated beam tests and Point Source Summation computations were used to model fluence distributions within the reactor.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.31053 |
| Date | January 2001 |
| Creators | Gray, Sandy-Kae A. |
| Contributors | Gehr, R. (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: 001810833, proquestno: MQ70232, Theses scanned by UMI/ProQuest. |
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