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UV lamp enclosure sleeve
| Details |
Inventors: Peterson, Ronald L.;
Assignee: Peroxidation Systems, Inc. (Tucson, AZ)
Primary Examiner: Lechert, Jr.; Stephen J.
Assistant Examiner: Bhat; Nina
Attorney, Agent or Firm: Mckown; Daniel C.
In an oxidation chamber for treating wastewater, an ultraviolet lamp is mounted inside a quartz tube that is surrounded by the wastewater in the oxidation chamber. During operation, the quartz tube becomes quite hot and becomes coated with a film of slime that reduces transmission of the ultraviolet radiation into the wastewater. This results in gradually decreasing efficiency of operation until its becomes necessary to interrupt the operation of the chamber and to remove the quartz tube so that it can be cleaned to restore the transmission. In accordance with the present invention it has been found advantageous to apply a thin layer of fluoroethylene propylene (FEP) to the outer surface of the quartz tube. It has been found that the FEP layer is less suspectible to the deposition of slime than is the unprotected quartz tube, and that the slime is more easily removed from the FEP layer than from an unprotected quartz tube. Further, the FEP layer strengthens the quartz tube and protects it from localized stresses and damage caused by impact. This protective effect makes it possible to use quartz tubes having thinner walls, and that increases the transmission of the ultraviolet radiation through the quartz wall. The FEP layer also reduces handling damage to the quartz tube and protects the maintenance workers from injury. |
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DETAILED DESCRIPTION The solution found by the present inventor consists of applying a thin layer of FEP (a perfluorinated ethylene-propylene polymer) available from DuPont as TEFLON FEP.
RTM.
to the surface of the quartz tube that is in contact with the wastewater.
The build-up of slime on the FEP is much slower than it is on quartz, and the FEP is more easily cleaned than the unprotected quartz.
When the FEP sleeve is used, the oxidation chamber does not require maintenance as often, and the maintenance is easier and safer to perform.
In accordance with a preferred embodiment of the invention, a thin layer of FEP is applied to parts of the surface of the quartz tube that surrounds the ultraviolet lamp envelope.
The layer of FEP may be applied to the quartz surface in the form of a sleeve, or in the form of a spiral winding that progresses along the quartz tube, in the form of a non-progressive wrapping, or in the form of a coating produced by dipping the quartz tube into a suspension of FEP.
As mentioned above, the FEP surface is less susceptable to the deposition of slime than is the unprotected surface of the quartz tube.
Not only does this reduce the frequency of maintenance and facilitate the cleaning process, but in addition the reduced fouling results in greater reaction efficiency made possible by the increased transmission of the ultraviolet radiation into the wastewater.
In addition to the main object of reducing maintenance, the application of FEP to the quartz tube produces a number of benefits that were not contemplated initially.
The FEP sleeve or coating permits the use of quartz tubes having a thinner wall.
The FEP layer reduces the localized stresses where the tube is sealed to the chamber It also protects the quartz tube from damage by impact, and it provides thermal insulation for the quartz tube.
In addition, the FEP layer protects maintenance workers from the sharp edges often present at the ends of the quartz tube and reduces breakage during handling.
Finally, unlike the unprotected quartz tube, the FEP layer has no tendency to stick to the sealing 0-ring after the oxidation chamber has been in use for some time, and this feature facilitates disassembly when maintenance is required
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