Four type of suspensions were dewatered by electroosmosis alone or by electroosmosis combined with other methods: (1) Clay (Bentonite or hydrocol)--electroosmosis with constant voltage continuous DC or square wave interrupted power. In the interrupted mode, a constant voltage was applied for t$ sb1$ seconds (the on-time) followed by a short circuit for t$ sb2$ seconds (the off-time). (2) Food waste--electroosmosis (continuous DC only) alone or in combination with expression (pressure of 207 kPa). (3) Titanium oxohydrate slurry--electroosmosis (similar to (1)) alone or in combination with a vacuum (absolute pressure of 89 kPa). (4) Pyrite slurry--electroosmosis (similar to (1)) in combination with vacuum (similar to (3)). The major independent variables were applied voltage, t$ sb1$ and t$ sb2,$ and initial bed height. The dependent variables were the amount of water removed and the electric current. / For clay and titanium oxohydrate there was an optimum off-time for a fixed on-time. For $ rm t sb1=30$ s, the most water was removed from clay with $ rm t sb2=0.1$ s while for titanium oxohydrate the most water was removed for $ rm t sb2=3.5$ s. For suspensions (2), (3) and (4), the combination of electroosmotic dewatering with vacuum or expression increased the amount of water removed. In general, interrupted power removed more water than continuous power electroosmosis. For suspensions (3) and (4), only the combined modes were able to achieve dewatering targets set by industry.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.23367 |
| Date | January 1995 |
| Creators | Gopalakrishnan, Sridhar |
| Contributors | Weber, M. E. (advisor), Mujumdar, A. S. (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 Chemical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001485984, proquestno: MM12119, Theses scanned by UMI/ProQuest. |
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