GB2389577A - Fluid treatment apparatus comprising UV lamps and means for cleaning said lamps - Google Patents
Fluid treatment apparatus comprising UV lamps and means for cleaning said lamps Download PDFInfo
- Publication number
- GB2389577A GB2389577A GB0311161A GB0311161A GB2389577A GB 2389577 A GB2389577 A GB 2389577A GB 0311161 A GB0311161 A GB 0311161A GB 0311161 A GB0311161 A GB 0311161A GB 2389577 A GB2389577 A GB 2389577A
- Authority
- GB
- United Kingdom
- Prior art keywords
- treatment apparatus
- fluid treatment
- radiation source
- cleaning means
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 72
- 239000012530 fluid Substances 0.000 title claims abstract description 44
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims description 46
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 13
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 230000003213 activating effect Effects 0.000 claims description 4
- 230000001699 photocatalysis Effects 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005670 electromagnetic radiation Effects 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 abstract description 12
- 239000001301 oxygen Substances 0.000 abstract description 12
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 9
- 244000005700 microbiome Species 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002070 germicidal effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/10—Ultraviolet radiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3227—Units with two or more lamps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/324—Lamp cleaning installations, e.g. brushes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/326—Lamp control systems
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Epidemiology (AREA)
- Toxicology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
A fluid treatment apparatus comprises a plurality of elongate UV lamps 13 mounted in a duct 10 and a cleaning assembly 14 comprising a plurality of cleaning heads 20 which are rotated around respective lamps and are simultaneously driven longitudinally thereof to clean the lamps 13 and the internal surface of the duct 10. The cleaning heads 14 each comprise a plurality of portions 28 of titanium dioxide which are biassed against the surface of the respective lamps 13 and which produce hydroxyls and oxygen free radicals in the presence of water and oxygen. Hydroxyls and oxygen free radicals are highly reactive and will break down the cells and molecules of the accumulated material on the lamps.
Description
Fluid Treatment Apparatus This invention relates to an apparatus for
treating fluids and more particularly but not solely to an apparatus for disinfecting water.
It is well known that high-intensity ultra-violet ( W) 5 light has germicidal properties which can be used to sterilize water. EP-A-0202891 discloses a fluid treatment apparatus which utilises these germicidal properties, and which comprises an elongate tubular duct having inlet and outlet ports at or adjacent its opposite ends, an elongate W light source TO extending along the axis of the duct and a guide vane extending helically along the internal wall of the duct between the input and output ports.
Water treatment companies are reluctant to utilise W sterilisers of the above-mentioned type because they do not 15 effectively treat all of the water. One reason for this is that slime and other matter, which accumulates on the surface of the lamp submerged in the water, attenuates the W light so much that micro-organisms which do not come within close proximity of the W lamp do not receive a dose of W radiation which is 20 sufficient to kill them. Furthermore, the main accumulation on the lamp is attributable to the dead carcasses of micro-
organisms: such carcasses undesirably act to filter a substantial amount of the W light being transmitted.
In order to overcome the above-mentioned problems, 25 fluid treatment apparatus are known which comprise a sleeve of polytetrafluoroethylene (PTFE), mounted as close but sliding fit on the elongate lamp. A piston can be actuated to occasionally drive the sleeve along the lamp, so as to clean the latter.
30 A disadvantage of this arrangement is that the sleeve actually smears the slime and other debris and in fact exacerbates the problem.
Another disadvantage of this arrangement is that the lamp may be slightly irregular in cross-section and thus there
( is a risk that the sleeve could miss the lamp, with the result that the lamp may not cleaned in some areas. There is also a risk that the sleeve could foul and break the lamp.
We have now devised a fluid treatment apparatus which 5 alleviates the above-mentioned problems.
In accordance with this invention, there is provided a fluid treatment apparatus comprising a treatment chamber for receiving the fluid to be treated, an elongate source of electromagnetic radiation extending through said chamber for 10 irradiating the fluid to be treated, said source of radiation being substantially circular in cross-section, and cleaning means mounted within the chamber, said cleaning means comprising a portion resiliently biassed against the external surface of said radiation source and actuator means for 15 rotating said portion circumferentially around said radiation source and for simultaneously driving the portion longitudinally of said radiation source.
In use, the portion of the cleaning means, which is biassed against the external surface of the radiation source, 20 is driven around the lamp and at the same time is driven longitudinally of the lamp. This creates a scrubbing action which substantially cleans any slime or other matter which may have accumulated on the surface of the lamp.
Any changes in the shape of the lamp along its length 25 are accommodated by the resilient bias applied to the portion of the cleaning means. Thus, the risk of the lamp not being fully cleaned or damaged is avoided.
Preferably said cleaning means comprises a plurality of portions which are resiliently biassed against the external 30 surface of said radiation source.
In one embodiment, said portions of the cleaning means are provided by adjacent turns of an elongate helical coil spring having opposite ends which are brought together to form an annular ring around said radiation source, the spring being 35 biassed against the external surface of said radiation source.
Preferably, the internal diameter of the annular ring formed by the spring is less than the external diameter of said radiation source, so as to provide said resilient bias.
In an alternative embodiment, said portions of the 5 cleaning means are provided by filaments arranged in a mesh or pad which is biassed against the external surface of said radiation source.
Preferably, the or each said portion of the cleaning means comprises an outer surface of a photo catalytic oxidising 10 semiconductor material, which is preferably titanium dioxide.
When the titanium dioxide (TiO2) or other photo catalytic oxidising semiconductor is irradiated with UV light, its surface becomes activated and, in the presence of water and oxygen, produces hydroxyls and oxygen free radicals. Hydroxyls 15 and oxygen free radicals are highly reactive and will break down the cells and molecules of the accumulated material on the lamp. In the case of micro-organisms, the hydroxyls and oxygen free radicals will destroy them by attacking and breaking down their cell walls.
20 Preferably the titanium dioxide is of the anatase form, which is the most reactive.
Preferably the cleaning means is formed of titanium, the titanium dioxide layer being formed by oxidising the titanium in water or another chemical which more rapidly 25 oxidises the titanium. If any of the titanium dioxide layer becomes damaged during cleaning, the exposed titanium will slowly re-oxides in water to repair the damage.
Preferably, said radiation source comprises a lamp arranged to emit W light, preferably having a wavelength below 30 400nM.
Preferably means are provided for energizing said radiation source and for simultaneously activating said cleaning means.
Preferably said energizing and activating means 35 comprises a sensor mounted remote from said radiation source
( which is arranged to provide an indication when the level of radiation falls below a predetermined value, thereby indicating that an accumulation of slime and other matter has developed.
Preferably the chamber comprises an elongate circular 5 section duct, the radiation source extending axially thereof.
In order to maximise the effect of the radiation, the internal wall of the duct is preferably reflective. It will be appreciated however that slime and other matter also builds up on the reflective internal wall of the duct, thereby reducing 10 the effect of the radiation.
Thus, the cleaning means preferably comprises a further portion resiliently biassed against the internal surface of the duct and actuator means for rotating said further portion circumferentially around the duct and for simultaneously 15 driving the portion longitudinally of the duct.
Preferably, the cleaning means comprises a rotational shaft extending axially of the radiation source and which is arranged to rotate the or each of said actuator means and to drive the latter axially of the shaft.
20 Preferably the actuator means which drives the portion for cleaning the lamp comprises a sleeve mounted for rotation around the axis of said elongate radiation source.
Preferably the actuator means which drives the portion for cleaning the duct comprises a rotatable member mounted 25 normal to the axis of the shaft rotation and having said portion on the radially outermost portion thereof.
Preferably the actuator means which drives the portion for cleaning the lamp is geared to the actuator means which drives the portion for cleaning the duct.
30 Preferably, the apparatus comprises a plurality of elongate radiation sources mounted parallel to each other, said cleaning means being arranged to clean each radiation source.
Preferably, each radiation source is arranged on a line which extends circumferentially of the shaft.
35 Preferably the portion for cleaning the duct comprises
( a cavity which faces the radiation source, the cavity being provided with an inlet for the introduction of cleaning fluid.
Preferably the cleaning means is arranged to induce a turbulent flow in the fluid. When not in use, the cleaning 5 means can be positioned upstream of the radiation source to create a turbulent flow of fluid through the duct: this turbulent flow of fluid creates a scrubbing action which helps to remove any slime or other matter which may have built up.
This turbulence also ensures that all of the water or other 10 fluid being treated comes within close proximity of the radiation source during treatment.
The cleaning means can be positioned downstream of the radiation source in instances when a turbulent flow is not be required. IS Embodiments of this invention will now be described way of examples only and with reference to the accompanying drawings, in which: FIGURE 1 is a perspective view of a first embodiment of water treatment apparatus in accordance with this invention, 20 with some parts being shown cut away; FIGURE 2 is an exploded view of the cleaning assembly of the apparatus of Figure 1; FIGURE 3 is a longitudinal sectional view through the cleaning assembly of Figure 2; 25 FIGURE 4 is a perspective view of the cleaning spring of the cleaning assembly of Figure 2; À FIGURE 5 is a longitudinal sectional view through the cleaning assembly of a second embodiment of water treatment apparatus in accordance with this invention; 30 FIGURE 6 is an exploded view of the cleaning assembly of a third embodiment of water treatment apparatus in accordance with this invention; and FIGURE 7 is a sectional view through the cleaning assembly of the apparatus of Figure 6.
35 Referring to Figure 1 of the drawings there is shown a
( water treatment apparatus comprising an elongate tubular duct lo formed of stainless steel and having inlet and outlet ducts 11, 12 mounted at its opposite ends. Four parallel elongate ultra-violet lamps 13 extend along the axis of the duct 10.
5 In use, water flows through the duct 10 between the inlet 11 and outlet, where it is irradiated by the UV lamps 13.
The lamps 13 illuminate and kill any micro-organisms in the water. However, the effectiveness of the apparatus depends on the dose of radiation received by the micro-organisms.
10 In time, slime and other matter, including the carcasses of dead microorganisms accumulate on the lamps 13, as well as on the internal reflective surface of the duct 10.
This accumulation of matter attenuates the W light and can lead to an insufficient dose of radiation being delivered.
15 In order to overcome this problem, and in accordance with this invention, the apparatus further comprises a cleaning assembly 14 which is arranged to clean any matter which has accumulated from the surface of the lamps 13 as well as from the internal surface of the duct 10.
20 The cleaning assembly 14 is journalled to an elongate externally threaded screw-threaded shaft 15 which extends along the central axis of the duct 10, with each lamp 13 being circumferentially arranged around the shaft IS at equal distances therefrom. A motor (not shown) at one end of the duct 25 10 rotates the shaft 15 about its axis, so as to drive the assembly along the duct in a direction according to the direction of shaft rotation.
Referring to Figures 2 and 3 of the drawings, the cleaning assembly comprises an internally screw-threaded drive 30 collar 16 mounted on the shaft 15. A drive gear 17 is also slidingly mounted on the shaft 15 and comprises a lug (not shown) which is received in a slot 18, which extends axially along the shaft 15. The drive gear 17 is captively but rotatably connected to the drive collar 16. A circular mounting 35 plate 19 is fixed to the drive collar 15 and lies normal to the
( axis of the shaft 15.
The mounting plate 19 comprises a plurality of apertures 21, in which respective cleaning heads 20 are captively mounted for rotation about respective axes which 5 extend parallel to the axis of the shaft 15.
Each cleaning head 20 comprises a through passage, through which a respective one of the lamps 13 extends. The cleaning heads 20 comprise a series of gear teeth 24 extending circumferentially thereof, which mesh with corresponding teeth 10 formed on the drive gear 17.
The gear teeth 24 on the cleaning heads 20 also mesh with corresponding gear teeth that extend around the internal edge of an annular gear ring 22, which circumscribes the heads 20. The gear ring 22 is constrained against axial movement by 15 flanges 23 disposed on opposite axial sides of the gear teeth 24 on each head 20.
In use, when the shaft 15 in rotated, the drive collar 16 (which is fixed against rotational movement by virtue of it being fixed to the mounting plate 19 that embraces the lamps 20 13) travels along the shaft 15 and carries with it the rest of the cleaning assembly 14.
The drive gear 17 is journalled to the slot 18 in the shaft 15 and thus the gear 17 turns as it is simultaneously driven along the shaft 15 by the drive collar 16.
25 As the drive gear 17 rotates, the cleaning heads 20, which are geared to the drive gear 17, also rotate about their respective lamps 13 as the assembly 14 travels along the shaft 15. Also, the gear ring 22 is rotated, by virtue of it being geared to the cleaning heads 20.
30 Each cleaning head 20 comprises a tubular body 25 mounted concentrically on its respective lamp 13 and attached to the mounting plate 19 by a bearing 26. The internal wall of the body 25 is formed with a circumferentially extending channel 27 at one end thereof, in which a cleaning spring 28 35 is seated. A further portion of the internal wall of the body
( 25 is also formed by a PTFE sleeve 29, which is preferably formed with a coarse internal screw thread.
Referring to Figure 4 of the drawings, the spring 28 comprises an elongate helically wound coil spring of titanium 5 wire, which is formed into an annulus by bringing its opposed ends together and inserting them onto the respective opposite ends of a short metal stud 30. A projection 31 extends radially outwardly of the annulus from the stud 30 and in use, this projection 31 is received in an aperture formed in the wall of 10 the channel 27 of the body 20, so as to fix the spring relative to the body 20.
Referring again to Figure 2 of the drawings, a plurality of further elongate titanium springs 32 are mounted axially on respective carriers 33, which extend 15 circumferentially around the periphery of the year ring 22.
In use, it will be appreciated that as the heads 20 rotate and advance along the lamps as hereinbefore described, the titanium springs 2B scour the surfaces of the lamps 13 and remove any matter which has accumulated thereon. Preferably the 20 thread of the shaft 15 is fine so that the scoured portions of the lamp 13 on every turn of the head 20 are merged. The coarse internal screw thread on the PTFE sleeve 29 also acts as a scraper on the surface of the lamp 13 to further enhance the cleaning action.
25 The springs 32 around the gear ring 22 abut the internal wall of the duct lO and act to scour the latter, thereby improving the reflectivity of the internal surface of the duct 10.
The cleaning is preferably performed when the duct 10 30 isolated from the fluid flow, so that the apparatus can be drained and flushed to remove all of the matter which has been cleaned from the surfaces of lamps 13 and duct 10.
During cleaning the lamps 13 are preferably illuminated to irradiate the titanium springs 28, 32, on which a layer of 35 titanium dioxide is formed by pre-treating the titanium with
( an oxidizing chemical.
When the titanium dioxide is irradiated with W light, its surface becomes activated and, in the presence of water and oxygen, produces hydroxyls and oxygen free radicals. Hydroxyls 5 and oxygen free radicals. Hydroxyls and oxygen free radicals are highly reactive and will break down the cells and molecules of the accumulated material on the lamps 13 and duct 10. In the case of micro-organisms, the hydroxyls and oxygen free radicals will destroy them by attacking and breaking down their cell lo walls.
In order to provide an indication of when cleaning is required, a photodetector 34 (Figure 1) may be provided to provide an indication of the level of W light inside the duct 10. When the level falls below a predetermined value, the 15 cleaning cycle can be initiated manually or perhaps automatically. If necessary a cleaning solution can be added to the water inside the duct during the cleaning cycle. Referring to Figure S of the drawings, in an alternative embodiment, 20 elongate extendable tubes 35 are connected to the mounting plate 19, to feed cleaning fluid into respective heads 20 by a rotational fluid coupling 36. Fluid is then conveyed through a passage 37 in the PTFE sleeve 29, so that the scraping action of the coarse thread inside the sleeve 29 is enhanced by the 25 cleaning fluid.
The mounting plate 19 is arranged to induce a turbulent flow in the water. When not in use, the cleaning assembly 14 can be positioned upstream of the lamps 13, adjacent the inlet 11, to create a turbulent flow of fluid past the lamps 13: this 30 turbulent flow of fluid creates a scrubbing action which helps to remove any slime or other matter which may have built up.
This turbulence also ensures that all of the water being treated comes within close proximity of the lamps 13 during treatment. 35 The cleaning assembly 14 can be positioned downstream
( of the lamps 13 in instances when a turbulent flow is not be required. Referring to Figures 6 and 7 of the drawings, in an alternative embodiment the titanium spring 28 is replaced by 5 two mesh pads 40 of titanium wire, which are mounted in respective cut-outs 41 formed tangentially in the tubular body 25 of the cleaning head. The depth of the cut-outs 41 is greater than the wall thickness of the body 25 such that the surface of the lamp 13 is exposed in the cut-outs. A garter 10 spring 42 extends around the body 25 and biasses the mesh pads 40 against the exposed portions of the lamp surface.
Instead of being internally screw-threaded, the PTFE sleeve 29 is formed of four segments which are constrained against the lamp 13 by two garter springs 43. The radius of 15 curvature of the internal surface of each segment is greater than the external diameter of the lamp 13, so that each segment contacts the lamp 13 along its longitudinal internal edges. The eight edges lie perpendicular to the direction of rotation and act to scrape the surface of the lamp 13.
20 A water treatment apparatus in accordance with this invention is extremely efficient at killing micro-organisms using W light and does not suffer from a loss of performance, owing to the cleaning assembly which effectively removes slime and other accumulated matter on the surfaces of the lamps and 25 duct.
Claims (1)
- ( Claims1. A fluid treatment apparatus comprising a treatment chamber for receiving the fluid to be treated, an elongate source of electromagnetic radiation extending through said 5 chamber for irradiating the fluid to be treated, said source of radiation being substantially circular in cross-section, and cleaning means mounted within the chamber, said cleaning means comprising a portion resiliently biassed against the external surface of said radiation source and actuator means for 10 rotating said portion circumferentially around said radiation source and for simultaneously driving the portion longitudinally of said radiation source.2. A fluid treatment apparatus as claimed in claim 1, in which said cleaning means comprises a plurality of portions 15 which are resiliently biassed against the external surface of said radiation source.3. A fluid treatment apparatus as claimed in claim 2, in which said portions of the cleaning means are provided by adjacent turns of an elongate helical coil spring having 20 opposite ends which are brought together to form an annular ring around said radiation source, the spring being biassed against the external surface of said radiation source.4. A fluid treatment apparatus as claimed in claim 3, in which the internal diameter of the annular ring formed by the 25 spring is less than the external diameter of said radiation source, so as to provide said resilient bias.5. A fluid treatment apparatus as claimed in claim 2, in which said portions of the cleaning means are provided by filaments arranged in a mesh or pad which is biassed against 30 the external surface of said radiation source.( 6. A fluid treatment apparatus as claimed in any preceding claim, in which the or each said portion of the cleaning means comprises an outer surface of a photo catalytic oxidising semiconductor material.5 7. A fluid treatment apparatus as claimed in claim 6, in which the photo catalytic oxidizing semiconductor material comprises titanium dioxide.8. A fluid treatment apparatus as claimed in claim 7, in which the titanium dioxide is of the anatase form.10 9. A fluid treatment apparatus as claimed in claims 7 or 8, in which the cleaning means is formed of titanium, the titanium dioxide layer being formed by oxidising the titanium.10. A fluid treatment apparatus as claimed in any preceding claim, in which said radiation source comprises a lamp arranged 15 to emit W light.11. A fluid treatment apparatus as claimed in any preceding claim, in which means are provided for energizing said radiation source and for simultaneously activating said cleaning means.20 12. A fluid treatment apparatus as claimed in claim 11, in which said energising and activating means comprises a sensor mounted remote from said radiation source which is arranged to provide an indication when the level of radiation falls below a predetermined value.25 13. A fluid treatment apparatus as claimed in any preceding claim, in which the chamber comprises an elongate circular-section duct, the radiation source extending axially thereof.( 14. A fluid treatment apparatus as claimed in any preceding claim, in which the internal wall of the duct is reflective.15. A fluid treatment apparatus as claimed in any preceding claim, in which the cleaning means comprises a further portion 5 resiliently biassed against the internal surface of the duct and means for rotating said further portion circumferentially around the duct and for simultaneously driving said further portion longitudinally of the duct.16. A fluid treatment apparatus as claimed in any preceding lo claim, in which the cleaning means comprises a rotational shaft extending axially of the radiation source and which is arranged to rotate said actuator means and to drive the latter axially of the shaft.17. A fluid treatment apparatus as claimed in any preceding 15 claim, in which the cleaning means comprises a sleeve mounted for rotation around the axis of said elongate radiation source.18. A fluid treatment apparatus as claimed in any preceding claim, in which the cleaning means comprises a cavity which faces the radiation source, the cavity being provided with an 20 inlet for the introduction of cleaning fluid.l9. A fluid treatment apparatus substantially as herein described with reference to Figures 1 to 4, Figure 5, and Figures 6 and 7 of the accompanying drawings.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/458,874 US6911655B2 (en) | 2002-06-13 | 2003-06-11 | Fluid treatment apparatus |
AT03253672T ATE357415T1 (en) | 2002-06-13 | 2003-06-11 | DEVICE FOR FLUID TREATMENT |
CA002432840A CA2432840A1 (en) | 2002-06-13 | 2003-06-11 | Fluid treatment apparatus |
EP03253672A EP1371611B1 (en) | 2002-06-13 | 2003-06-11 | Fluid Treatment apparatus |
DE60312598T DE60312598T2 (en) | 2002-06-13 | 2003-06-11 | Device for fluid treatment |
ES03253672T ES2285048T3 (en) | 2002-06-13 | 2003-06-11 | FLUID TREATMENT DEVICE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0213581A GB0213581D0 (en) | 2002-06-13 | 2002-06-13 | Fluid treatment apparatus |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0311161D0 GB0311161D0 (en) | 2003-06-18 |
GB2389577A true GB2389577A (en) | 2003-12-17 |
GB2389577B GB2389577B (en) | 2005-09-14 |
Family
ID=9938501
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0213581A Ceased GB0213581D0 (en) | 2002-06-13 | 2002-06-13 | Fluid treatment apparatus |
GB0311161A Expired - Fee Related GB2389577B (en) | 2002-06-13 | 2003-05-15 | Fluid treatment apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0213581A Ceased GB0213581D0 (en) | 2002-06-13 | 2002-06-13 | Fluid treatment apparatus |
Country Status (1)
Country | Link |
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GB (2) | GB0213581D0 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2412319A (en) * | 2004-03-25 | 2005-09-28 | Malcolm Robert Snowball | Apparatus for disinfecting air flowing along a duct in an air conditioning or ventilating system |
US8293185B2 (en) | 2008-11-12 | 2012-10-23 | Statiflo International Limited | UV irradiation apparatus and method |
GB2529041A (en) * | 2014-08-06 | 2016-02-10 | Greenthread Ltd | Apparatus and methods for water treatment |
SE541117C2 (en) * | 2017-02-17 | 2019-04-09 | Wallenius Water Innovation Ab | A liquid treatment system comprising at least one ultra-violet (UV) treatment lamp |
US11001510B2 (en) | 2017-02-17 | 2021-05-11 | Wallenius Water Innovation Ab | Liquid treatment system |
SE2050120A1 (en) * | 2020-02-06 | 2021-08-07 | Wallenius Water Innovation Ab | Cleaning arrangement for a liquid treatment system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10249334A (en) * | 1997-03-12 | 1998-09-22 | Nippon Photo Sci:Kk | Automatically cleaning mechanism for light transmitting tube of photoirradiation device |
WO1999040032A1 (en) * | 1998-02-03 | 1999-08-12 | Kenneth Ray Bryer | An apparatus for treating a liquid |
DE10032645A1 (en) * | 2000-07-05 | 2002-01-17 | Peter Ueberall | Cleaning device for cleaning cylindrical bodies, preferably quartz tubes in UV disinfection systems for disinfecting waste water, comprises cleaning rings which are moved axially backward |
-
2002
- 2002-06-13 GB GB0213581A patent/GB0213581D0/en not_active Ceased
-
2003
- 2003-05-15 GB GB0311161A patent/GB2389577B/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10249334A (en) * | 1997-03-12 | 1998-09-22 | Nippon Photo Sci:Kk | Automatically cleaning mechanism for light transmitting tube of photoirradiation device |
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GB2412319A (en) * | 2004-03-25 | 2005-09-28 | Malcolm Robert Snowball | Apparatus for disinfecting air flowing along a duct in an air conditioning or ventilating system |
GB2412319B (en) * | 2004-03-25 | 2007-08-22 | Malcolm Robert Snowball | Fluid treatment system |
US8293185B2 (en) | 2008-11-12 | 2012-10-23 | Statiflo International Limited | UV irradiation apparatus and method |
GB2529041A (en) * | 2014-08-06 | 2016-02-10 | Greenthread Ltd | Apparatus and methods for water treatment |
SE541117C2 (en) * | 2017-02-17 | 2019-04-09 | Wallenius Water Innovation Ab | A liquid treatment system comprising at least one ultra-violet (UV) treatment lamp |
US10968116B2 (en) | 2017-02-17 | 2021-04-06 | Wallenius Water Innovation Ab | Liquid treatment system |
US11001510B2 (en) | 2017-02-17 | 2021-05-11 | Wallenius Water Innovation Ab | Liquid treatment system |
SE2050120A1 (en) * | 2020-02-06 | 2021-08-07 | Wallenius Water Innovation Ab | Cleaning arrangement for a liquid treatment system |
WO2021158156A1 (en) * | 2020-02-06 | 2021-08-12 | Wallenius Water Innovation Ab | Cleaning arrangement for a liquid treatment system |
SE544296C2 (en) * | 2020-02-06 | 2022-03-29 | Wallenius Water Innovation Ab | Cleaning arrangement for a liquid treatment system |
Also Published As
Publication number | Publication date |
---|---|
GB0311161D0 (en) | 2003-06-18 |
GB2389577B (en) | 2005-09-14 |
GB0213581D0 (en) | 2002-07-24 |
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732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
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Effective date: 20090515 |