DE102004051621A1 - Apparatus for UV water purification comprises a vessel with tube-enclosed UV sources together with a float enabling adjustment of vessel height in a reservoir or running water - Google Patents

Abstract

Apparatus for UV irradiation of water in a reservoir (especially waste water to be purified) has a vessel with a water-permeable housing (10), the vessel containing at least one UV light source (13) with an associated protective tube (12) of UV-permeable material and having attached to the vessel a float (14) to hold the vessel floating at a predetermined distance from the reservoir water surface.

Description

The Invention relates to a device for UV irradiation of water, which undergoes a cleaning by the UV irradiation. Such to be cleaned Water includes i.a. biologically contaminated wastewater in sewage treatment plants, as well as contaminated waters of lakes or flowing waters. Equally will UV radiation is also used to disinfect the water of swimming pools.

in the The state of the art is the purification of water with UV light well known in which cleaning process due to the ultraviolet Radiation killed microorganisms become. Furthermore, it is known that UV irradiation for photochemical Use cleaning of the water, as well as for example at swimming pools is provided. The UV radiation should be contained in the water here Chloramines, trihalomethane and absorbable organic halogens dismantle. The water is released by the irradiation of oxidizing substances freed, could destroy the otherwise downstream membrane filter. These Oxidizing agents are activated in the UV system, causing them through the formation of OH radicals are degraded. The irradiation of the water to be treated takes place at a predetermined wavelength, the essentially the value of the absorption energy level of the respective contaminant in the water.

at the treatment of water with the help of UV radiation the electromagnetic radiation is absorbed by the water, what due to the haze of water due to its impurities usually only in a spatially limited area around the light source. In the UV irradiation of waste water to Germ number reduction is therefore the UV irradiation in a runoff stream made to clean the water, to ensure is that the radiation dose over the water flow cross section of the flow continuously distributed is and every water element possible is irradiated with the same radiation dose. In this regard is also make sure that the flow rate in the irradiation zone preferably is even. Since the wastewater usually strongly absorbs UV light, there is one uniform illumination As a rule, the discharge cross section can only be reached imperfectly. The inevitable variations in irradiance are through one as possible to compensate for extensive mixing of the water in the irradiation zone.

in the State of the art for this purpose UV irradiation systems are known, the arranged in a drainage channel with in particular free-flowing drain are, wherein the channel has a rectangular cross-section and the Irradiation plant from the upwardly open side of the channel will be installed. The used for this purpose extending in a longitudinal direction Light sources are in cylindrical protective tubes taken perpendicular to the flow direction of the water in the channel are mounted. The light sources are with their longitudinal axis either horizontally lying or vertically arranged in rows, wherein a plurality of light source rows in the channel offset from one another can be provided.

are the light source rows are arranged vertically in the channel, then the vertical mixing due to the vertical pressure gradient and of the hydraulic resistance by the light sources in the channel often insufficient, bringing near the bottom of the channel an extremely bad illuminated zone is present. Furthermore, due to the fluctuation ranges the water level and the water flow velocity in the channel Dirt deposits and encrustations form, which greatly affect the quality of illumination.

at Devices of the type mentioned with horizontal in the channel arranged UV light sources in protective tubes can due to an adapted and suitably chosen Spacing the light sources to each other a reinforced deposit formation and a high crust formation on the thermowells by vertical Mixing of the water as well as a high hydraulic resistance be avoided. The disadvantage, however, is that at one end the protective tubes outgoing electrical connections and the associated closures of the protective tubes are located in the water. Furthermore, only a small horizontal Mixing of the water flow achieved.

To It is independent for maintenance purposes from the arrangement of the light sources in horizontal or vertical Rows suitable to combine a row of light sources into a module, which can be removed as a whole from the channel.

All in all is disadvantageous in the above systems in the prior art that the Arrangement of the UV irradiation system on the size and conditions of the Gerinnes must be coordinated, or vice versa. This is a problem in UV irradiation systems that are firmly mounted in a channel, in that the water level in the channel are kept constant must, because otherwise either to be cleaned water, the UV irradiation system without irradiation overflows or the light sources protrude out of the water, which is the source of light because of possible overheating harmful is.

Around The latter problem of variable water level is to solve according to the WO 94/00387 proposed a UV irradiation unit in a flume to install, with an adjustment to the water level thereby is completed that the UV light sources with their longitudinal axis in each case from the channel bottom from obliquely upward pivotable a floating carrier are held. The float carrier has a Schwenkviereckrahmen with side short and side long profile struts and is over a rocker pivotally fixed to the gutter bottom. adversely However, this is because of the fluctuation range of the water level and the adaptation to it by the float always an influence is taken to the relative position of the UV light sources, so the distance between the light sources constantly changes.

task The invention is a simple structural device of the above mentioned type, with the regardless of external conditions of a water reservoir, such as for example, a channel, as well as the water supply in the reservoir a sufficient treatment effect is achieved. It is also a Object of the present invention, a device for UV irradiation to provide water whose construction is versatile for different Purposes and various water reservoirs allows. It should be in this regard Be provided device that is easy to install and just as easily can be uninstalled.

to solution The above objects are according to the invention suggested that the device for UV irradiation of water a container having a container housing penetrable by the water to be purified, in which a UV light source is arranged. The device can thus by inserting the container in every possible one Water reservoir can be used.

Around a uniform cleaning effect too and to keep the water level in the container constant, is a floating device fixed to the container, with the container in the water at a predeterminable distance to the water surface of the Water reservoir is kept floating. The container housing is with the exception of a defined inflow and a defined process closed to the water of the reservoir. The container may also be upwards open or closed. By the above measure is a UV irradiation system in a container created, which is a mobile unit of the irradiation facility, with which the device can be used in many ways. The above indicated reservoir in which the water to be purified is located and in that the container used for cleaning the water, can be a sewage channel or sewer of a sewage treatment plant, as well as a lake, lake in general or a swimming pool be. Independent of Water level in the reservoir is determined by the defined inflow of the container a predefined water flow is passed through the container in the outlet of the container, wherein the arrangement of the light sources in the container ensures that the through container guided Water stream absorbs a sufficient dose of radiation, so that the water stream leaving the drain has been sufficiently cleaned Water exists.

The Invention thus provides as a result a UV irradiation unit, at the independent from external conditions the water reservoir in which the container is inserted, all the parameters are intended for the treatment of the water, such as the absorption conditions, mixing of the water in the container, throughput volume, Flow rate of the water through the container, etc., so indifferent from the site, the fulfillment desired Cleaning requirements guaranteed is.

Of the Water flow at the outlet of the container can taken up in a pipeline as a free-flow overflow be the water for another process step leads to another container. Further is it possible over the Piping the purified wastewater elsewhere in the To lead reservoir.

According to one advantageous embodiment provided that a plurality of housed in protective tubes UV light sources is provided, which light sources in the container with its longitudinal axis are arranged in the vertical direction. Thus, can be electrical connections place the light sources above the water surface of the water in the container. The fact that the water level in the tank through the floating embodiment is kept constant, the water level adjustable over a leveling of the floating body is (see on later Location) is further due to the vertical arrangement of the light sources ensures that the risk intensified Encrustation by dry falling of the light sources or the protective tubes is eliminated.

In order to achieve an improved mixing of the water in the container, it is provided according to an advantageous embodiment, that the plurality of light sources are arranged in parallel rows to each other, wherein the rows are provided offset in the parallel direction, such that the light sources of a row perpendicular to Parallel direction in the interstices of the preceding walking light source row are arranged. By this arrangement, a desired turbulence of the water flow passing through the container, wherein the turbulence is to ensure that each water element is brought close enough to a light source to irradiate it sufficiently.

When Advantageously, it is further considered that the hinged to the container Floating device is held vertically adjustable relative to the container. By This measure let yourself the water level in the tank with predefined or fixed flow of the water flow as free overflow from the container to adjust. This is an adjustment of the light sources to the water level in the container possible and the immersion depth of the light sources in the water of the container adjustable.

In the case where the container the device according to the invention in a flowing channel of for example, a sewage treatment plant is used, it may be due to the flow of water in the channel come to a vertical inclination of the container. In this regard is in an advantageous embodiment provided that the floating device is held adjustable by the container, that the inclination of the container in terms of its vertical direction in three-dimensional space adjustable is.

The Container housing of container can have any shape. Normally, the housing is a Be rectangular box, with a round, tubular or oval-shaped embodiment as well is conceivable. Advantageously, the container housing made of stainless steel, made of aluminum or made of a HDPE plastic. This is the container in the water to be cleaned durable, because these materials are sufficiently chemically resistant.

It is also considered advantageous that the defined feed is a regulated inlet, whereby the cross-sectional opening of the Inlet is adjustable. The regulation of the inlet can thereby be realized a motor operated inlet valve.

Likewise the drain of the container a regulated sequence with adjustable cross-sectional opening of Be expiration. Again, the regulation of the process by a be realized motor-operated drain valve. To u.a. a uniform flow through the container be provided, it is considered advantageous to the inlet to a Side of the container near the tank bottom to provide, with the drain on the diametrical opposite Side of the container is provided at the upper end.

According to one further advantageous embodiment is provided that the container across from the inlet in the sole area has a cleaning opening, which with a Cleaning flap can be closed is. This is a flush of the container in the Floor area possible, at the bottom of the container deposited impurities by means of the inflow through the inlet remove the container. The cleaning opening Accordingly, it may also function as a further drain opening, for example, the water in the container for maintenance purposes drain. So it is also possible to provide a submersible pump at the bottom of the container housing, with the water from the container is pumpable.

at an arrangement of the submersible pump at the inlet of the container, the submersible pump also to serve to increase the flow of water from the reservoir into the container promote. This measure comes especially in quiet to standing water reservoirs into consideration, where the flow of water through the container is artificial, i.e. provided by the submersible pump or at least to support.

A sees further advantageous embodiment before that in the bottom area of the container a horizontal and parallel to the tank bottom spaced second bottom is provided corresponding to the holes the number of in the container having to be arranged light sources. The holes have a diameter according to the diameter of the protective tube, so that a protective tube through the second floor is insertable until the protective tube covers the floor contacted the container housing. This provides that the light sources with their protective tubes are sufficiently recorded on the ground.

These measure but also has the further advantage that due to the light source construction with a light source socket present at the lower end of the protective tube resulting dead space of the lamps is covered. The second fed Ground is opposite For this purpose, the protective tubes sufficiently sealed so that in the field of lower dead space of the light sources no water to be purified can flow. Thus there is no area within the container with a reduced Radiation dose.

It is also considered advantageous that at the bottom of the container housing to the inlet side, an aperture is provided, which aims that the inflowing water from the inlet does not meet in direct flow to the irradiation tubes. Rather, the water inflow bounces on the panel and is thereby discharged upwards. This leads to an improved turbulence in the lower part of the Be container housing, whereby the residence time of the water particles in the lower region of the container is extended. It is possible in this regard that the diaphragm surrounds all irradiation bodies in an annular manner.

Finally, can be provided that a measuring probe is arranged on the container, with the one Contact of the bottom of the tank housing to the sole the reservoir in which the water to be purified is received, can be detected. The signal can, for example, to a Alarm be given, which alarm by sitting on the container is triggered on the sole of the reservoir.

The Invention will be described in more detail below with reference to the attached Drawings closer explains in which show:

1 a schematic sectional side view of the device according to the invention;

2 a plan view of the device according to the invention 1 ;

3 a sectional side view of the device according to the invention 1 ; and

4 a special embodiment of the device according to the invention.

As in 1 As shown, the device according to the invention comprises a container with a container housing 10 in, in the embodiment shown, several UV light sources 13 in protective tubes 12 are included. The container is in a channel channel 26 used and by means of two floats 14 kept floating at a predetermined distance from the water level of the channel. The influx of water to be purified from the channel 26 in the container 10 via an inlet 16 at the bottom of the container body 10 , A process 18 is at the diametrically opposite end in the upper region of the container housing 10 arranged as a free-drain drain, allowing the container through the inlet 16 penetrating water from bottom left to top right is flowed through the drain. By this arrangement of the inlet 16 and the process 18 at diagonally opposite ends of the container housing 10 is a smooth and complete flow of water past the UV light sources 13 guaranteed.

The UV light sources 13 are in protective tubes 12 which in turn are provided with flange closure heads (not shown in detail) at their upper ends via a support on the container housing 10 are attached. So can the electrical wires of the UV light sources 13 be discharged dry above the water level in the container.

The two floats 14 are height adjustable via threaded rods on the container housing 10 hinged so that the water level in the container housing 10 about the adjustment of the floats 14 is adjustable. A setting of the container body 10 relative to the floats 14 is also possible such that a vertical inclination of the container housing 10 in the inserted state of the container in the channel flume 26 is adjustable to each side direction of the room. The respective float 14 is this at two places on the container housing 10 hinged, so that an overall adjustment of the container housing 10 in all three spatial directions is possible when the container is floating in the water.

At its lower end, the container housing 10 a cleaning opening, which can be opened or closed with a mechanically actuated slide. The cleaning opening is at the tank bottom opposite the inlet 16 arranged so that by the influx of water into the inlet impurities that have accumulated on the container housing bottom through the cleaning port 24 from the container housing 10 can be rinsed.

As further shown in the figure, a double bottom is provided on the sole of the container housing, which on the one hand through the bottom of the container housing 10 and on the other hand is formed by a retracted second floor. The second floor has openings for the protective tubes 12 of UV light sources. This is the bottom dead space 23 covered by the UV lamp, so that no water to be purified from the inlet side of the container in the lower dead space 23 can flow. The second floor is in this respect to the thermowells 12 sufficiently sealed.

As the UV lamps also in the upper area below the mounting flange of the protective tubes 12 an upper dead space 22 is about leveling the floats 14 adjust the water level in the container such that the upper Todraum 22 the UV lamps stick out of the water. This ensures a uniform dose of radiation within the container.

At the bottom of the container is also an inlet to the inlet side 25 installed, which deflects the incoming water flow upwards. This creates an improved swirl in the bottom area of the container and results in a longer residence time of the water particles on the front irradiation tubes.

As shown in the figure, the process is 18 with a motorized drain valve 20 provided with the cross-sectional area of the drain and thus the passage amount of the water flowing through the container is adjustable. The sequence 18 is via a flange connection including the drain slide 20 on a flexible hose connection 28 connected, so that the position of the container can be adjusted with attached drain pipe at the water level of the channel channel.

2 shows the device of the invention 1 in plan view. In this illustration, it is easy to see how the individual UV light sources 13 in their protective tubes 12 in staggered rows in the container housing 10 are arranged. As already described above, such a displacement of the light sources ensures a desired turbulence of the water as it flows through the container.

3 shows the device of the invention 1 in side view along in 1 shown section line. For clarity, the UV light sources 13 omitted in the middle of the container, leaving the drain 18 is visible in the illustration. As in 3 also shown are the vertically arranged UV light sources 13 via a wiring to a control in a control cabinet 30 connected. Thus, the UV light sources can be 13 switch on or off as required. This may be necessary for maintenance purposes, for example.

4 shows a specific embodiment of the device according to the invention in the form of a thin-film reactor 32 , In this thin-film reactor 32 is a single UV light source 13 in a protective tube 12 from a cylindrical container housing 10 arranged. The container housing 10 is from a swimmer 14 carried on the water surface of the water to be purified. The feed 16 is at a predetermined distance from the bottom of the thin-film reactor 32 arranged so that the influx of water to be cleaned in the container housing 10 not in the area of the lower dead space of the UV lamp. Equally, however, it is also possible to provide a second bottom for covering the lower dead space of the UV lamp. The sequence 18 is located with a drain valve 20 at the diagonally opposite end of the cylindrical container housing 10 , With this embodiment, a safe radiation dose absorbed by the water is ensured, since the diameter of the cylindrical container housing 10 can be adapted to the absorption capacity of the water to be purified, which even with difficult to clean wastewater sufficient sterilization is provided. For this purpose, the space between the protective tube 12 and the inner wall of the container housing 10 be provided as low as possible. Will the radiation dose from the UV light source to the inner wall of the container housing 10 held approximately constant, the parameter of the radiation duration on the setting of the drain slide 20 be set, since the water element coming from the inlet 16 to the process 18 flows over the entire flow path of the UV light source 13 is irradiated.

10

container housing

12

thermowell

13

UV-light source

14

swimmer

16

Intake

18

procedure

20

expiration slide

22

upper Dead space of a UV lamp

23

lower Dead space of a UV lamp

24

cleaning opening

25

cover

26

channel

28

flexible hose connection

30

switch cabinet

32

thin-film reactor

Claims (16)

Device for UV irradiation of water in a water reservoir, preferably of wastewater to be cleaned, comprising a UV irradiation unit with at least one light source radiating in the ultraviolet range (US Pat. 13 ) in a protective tube ( 12 ) is received from UV-transparent material and held by a floating device in the water, characterized in that a container with a water-penetrable by the container housing ( 10 ) is provided, in which the at least one in the protective tube ( 12 ) recorded light source ( 13 ) and that the floating device ( 14 ) is fixed to the container to keep the container in the water at a predeterminable distance to the water surface of the reservoir floating. Apparatus according to claim 1, characterized in that a plurality of in protective tubes ( 12 ) received UV light sources ( 13 ), which light sources are arranged vertically in the container with its longitudinal axis. Apparatus according to claim 2, characterized in that the plurality of light sources ( 13 ) are arranged in parallel rows, wherein the rows are arranged offset in the parallel direction to each other, such that the light sources of a row perpendicular to the parallel direction in the Zwischenräu are arranged in the preceding light source row. Device according to one of the preceding claims, characterized in that the floating device ( 14 ) relative to the container height adjustable on the container housing ( 10 ) is held. Device according to one of the preceding claims, characterized in that the floating device ( 14 ) is adjustably held on the container, such that the inclination of the container with respect to its vertical direction in three-dimensional space is adjustable. Device according to one of the preceding claims, characterized characterized in that the container made of stainless steel, aluminum or HDPE plastic. Device according to one of the preceding claims, characterized in that the container has a regulated inlet ( 16 ) having. Device according to claim 7, characterized in that that the regulation of the inlet by a motor-driven inlet slide is trained. Device according to one of the preceding claims, characterized characterized in that the container has a controlled sequence. Apparatus according to claim 9, characterized in that the regulation of the sequence by a motor-operated drain valve ( 20 ) is trained. Device according to one of the preceding claims, characterized in that the inlet ( 16 ) is provided at the bottom of the container and the drain ( 18 ) is provided on the diametrically opposite side at the upper end of the container. Device according to one of the preceding claims, characterized in that the container with respect to the inlet in the sole region of the container a cleaning opening ( 24 ) of the container, which cleaning opening is closable with a cleaning flap. Device according to one of the preceding claims, characterized in that a submersible pump is arranged in the container. Device according to one of the preceding claims, characterized in that in the bottom region of the container a horizontally and parallel to the container bottom spaced second bottom is provided in the holes corresponding to the number to be arranged in the container light sources ( 13 ) with a diameter corresponding to the diameter of the protective tube ( 12 ) are inserted so that a protective tube can be plugged through the second bottom, until the protective tube to the bottom of the container housing ( 10 ) contacted. Device according to one of the preceding claims, characterized in that a diaphragm ( 25 ) is provided, which deflects the influx of water to be purified. Device according to one of the preceding claims, characterized in that a measuring probe is provided, with which a Contact of the bottom of the tank housing to Sole of the reservoir, in which the water to be purified was added is, is detectable.