Photocatalytic reactor

• US 5,683,589 A
• Filed: 03/13/1995
• Issued: 11/04/1997
• Est. Priority Date: 03/13/1995
• Status: Expired due to Term

• Current Assignee: University of Western Ontario
• Original Assignee: University of Western Ontario
• Inventors: Valladares, Julio, de Lasa, Hugo I.
• Primary Examiner(s): FORTUNA, ANA M
• Application Number:
  US08/403,189
• Time in Patent Office: 967 Days
• Field of Search: 210/748, 210/763, 210/510.1, 210/503, 210/505, 210/506, 210/507, 210/501, 210/502.1, 210/251, 210/323.1, 210/433.1, 210/437, 210/446, 210/497.01, 502/5, 502/242, 502/527, 250/215
• US Class Current: 210/748.14
• CPC Class Codes: B01D 17/0202 by ab- or adsorption
• CPC Class Codes: B01D 17/04 Breaking emulsions
• CPC Class Codes: B01D 17/045 with coalescers
• CPC Class Codes: B01D 17/06 Separation of liquids from each other by electricity
• CPC Class Codes: B01D 17/08 Thickening liquid suspensions by filtration

Abstract

The reactor has two tubes arranged concentrically, one having a larger diameter than the other, the tubes thus defining an inner channel and an outer channel. The inner channel contains an elongated light source, such as a bulb or a fiber optic bundle receiving sunlight from a solar collector, radiating light outwardly, the light including a substantial component of light having a wavelength of less than 390 nm. The outer channel has at least one and preferably a number of angled conical baskets arranged therein, each basket covering all of the channel and having a face supporting a fiber glass mesh thereon, exposed towards the light. An alternative embodiment reflects sunlight inwardly towards a single tube with baskets. Each basket has a plurality of small apertures therethrough to permit water to pass therethrough, and the mesh is impregnated with TiO₂ particles. Preferably, the inner surface of the outer channel is reflective. The mesh is prepared by a process which includes treatment of the TiO₂ particles with methanol, preferably in a 25% solution with water, or with some other suitable dispersant prior to placement on the substrate.

Claims

1. A photocatalytic reactor, comprising two tubes arranged concentrically about an axis, one having a larger diameter than the other, said tubes thus defining an inner channel and an outer channel, said outer channel being connected to have water flowed therethrough, said inner channel containing an elongated light source along said axis, radiating light outwardly, said light including a substantial component of light having a wavelength of less than 390 nm, said outer channel having at least one truncated conical basket arranged therein, said basket covering all of said channel and having a face supporting a fiber glass mesh thereon, said face and mesh being exposed towards said light by virtue of said face being angled to define said truncated conical shape, said basket further having a plurality of small apertures therethrough to permit water to pass therethrough, said mesh being impregnated with TiO₂ particles.

2. A reactor as recited in claim 1, where said outer channel has a reflective inner surface.

3. A reactor as recited in claim 1, where said basket faces are angled at 45 degrees from said axis.

4. A reactor as recited in claim 1, where said TiO₂ particles are in the anatase crystalline form.

5. A reactor as recited in claim 1, where said elongated light source is a fiber optic bundle which directs light received from a solar collector.

6. A photocatalytic reactor, comprising a cylindrical tube arranged about an axis, and defining an inner channel, said tube being connected to have water flowed therethrough, and a solar collector/reflector comprising a cylinder with a large longitudinal portion removed, said cylinder also arranged about said axis, outside said tube, the inside of said cylinder being reflective so as to reflect sunlight inwardly, said tube having at least one conical basket arranged therein, said basket covering all of said tube inner channel and having a face supporting a fiber glass mesh thereon, said face and mesh being exposed towards said sunlight, whether reflected or direct, by virtue of said face being angled to define said conical shape, said basket further having a plurality of small apertures therethrough to permit water to pass therethrough, said mesh being impregnated with TiO₂ particles from a solar collector.

7. A reactor as recited in claim 6, where said basket faces are angled at 45 degrees from said axis.

8. A reactor as recited in claim 6, where said TiO₂ particles are in the anatase crystalline form.

9. A method of treating contaminated water, comprising flowing said water through a photocatalytic reactor, said reactor comprising two tubes arranged concentrically about an axis, one having a larger diameter than the other, said tubes thus defining an inner channel and an outer channel, said outer channel being connected to have water flowed therethrough, said inner channel containing an elongated light source along said axis, radiating light outwardly, said light including a substantial component of light having a wavelength of less than 390 nm, said outer channel having at least one truncated conical basket arranged therein, said basket covering all of said channel and having a face supporting a fiber glass mesh thereon, said face and mesh being exposed towards said light by virtue of said face being angled to define said truncated conical shape, said basket further having a plurality of small apertures therethrough to permit water to pass therethrough, said mesh being impregnated with TiO₂ particles.