DE102015108685A1 - UV light irradiation device for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow and plant for the treatment of a liquid medium with ultraviolet light with such an irradiation device preferably in the flow - Google Patents

Abstract

UV light irradiation device for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, comprising a preferably cylindrical vessel having an inlet and an outlet for a medium to be irradiated, an elongated UV radiation source in the vessel UV radiation source concentrically surrounding the UV transmissive cladding tube in the vessel, a UV transmissive tube concentrically surrounding the cladding tube to form an outer and an inner UV treatment region in the vessel, wherein the outer UV treatment region is in fluid communication with the inlet; inner UV treatment area is in fluid communication with the outlet and the outer UV treatment area is in fluid communication with the inner UV treatment area such that the main flow direction of the medium to be irradiated in the outer UV treatment area is opposite to the main flow direction the medium to be irradiated is in the inner UV treatment region, characterized in that the outer UV treatment region is in fluid communication with the inner UV treatment region via a medium guide device designed to impinge the medium on the cladding tube obliquely, and plant with the same.

Description

The present invention relates to a UV light irradiation device for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, a plant for the treatment of a liquid medium with ultraviolet light, in particular UVC light, preferably in flow, a method for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow and a method for operating such a system.

The present invention relates generally to the treatment or treatment of clear and cloudy liquids for the purpose of disinfection and elimination of microbiological contamination, microbiological toxins and chemical contamination by means of ultraviolet light, in particular with wavelengths in the range of about 100-300 microns.

According to the current legal regulations, it is absolutely necessary to treat or prepare liquids for the respective field of application, so that they comply with the legal requirements. In this case, preferably all toxic elements should be removed from the liquid. These can be both physical, chemical and microbiological substances. This is currently only possible with the use and use of fine filters with small pore size in conjunction with activated carbon filters. However, the known methods are very expensive in the purification of large quantities of liquid and require a large volume of space. There are also known devices in which chlorine and other chemicals are not used, but the irradiation with UV light of certain wavelengths or ultrasound is provided for water sterilization. The shortwave UV light in particular is used in substances such. As DNA, absorbed in the liquid. The amount of absorbed UV light is sufficient for relatively clear liquid to effect photochemical conversion. There then remains a necessary for the division of DNA information sharing. When an information disorder level is exceeded, cells die without proliferating. Thus, microorganisms living by ultraviolet light are killed or inactivated by destruction of the DNA, that is, a stabilizing effect is thereby obtained. The wavelength of the UV light is typically in the range of 70-400 nanometers, preferably 254 or 180-200 nanometers in vacuum UVC lamps. The medium should therefore not flow parallel to the cladding tube at the beginning.

The efficiency of the known devices that perform sterilization by means of UV light, however, is still insufficient. This is mainly due to the high contamination of the quartz glass that surrounds the UV light sources, and / or to a high turbidity or color of the liquid to be disinfected.

The present invention is therefore based on the object to increase the efficiency of (physical) water treatment / disinfection by means of UV light.

According to the invention, this object is achieved according to a first aspect by a UV light irradiation device for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, comprising a preferably cylindrical vessel having an inlet and an outlet for a medium to be irradiated , an elongated source of UV radiation in the vessel, a UV transmissive cladding tube concentrically surrounding the UV radiation source in the vessel, a UV transmissive tube concentrically surrounding the cladding tube to form an outer and an inner UV treatment region in the vessel outer UV treatment area is in fluid communication with the inlet, the inner UV treatment area is in fluid communication with the outlet, and the outer UV treatment area is in fluid communication with the inner UV treatment area such that the main flow direction of the one to be irradiated Medium in the outer UV treatment area is opposite to the main flow direction of the medium to be irradiated in the inner UV treatment area, characterized in that the outer UV treatment area in fluid communication with the inner UV treatment area via a medium guide device which is designed to the Medium to impinge on the cladding tube obliquely. The medium should therefore not flow parallel to the cladding tube at the beginning.

According to a second aspect, this object is achieved by a system for treating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, comprising a UVC light irradiation device according to one of claims 1 to 5 and optionally one of the UV light -Bestring device upstream filter device solved with an inlet and an outlet.

Furthermore, the present invention provides a method for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow through the use of a UV light irradiation device.

In addition, the present invention provides a method of operating a system according to any one of claims 6 to 21, wherein one exposing medium at a rate of at least 8 meters / second between the outer tube and the cladding tube.

In the case of the UV light irradiation device, it may be provided that the medium guiding device is designed such that the medium is in a first plane containing the longitudinal axis of the cladding tube at an angle α in the range of 0 ° <α <90 ° to the cladding tube meets. An angle α of 90 ° would, in principle, mean that the medium in the first plane would strike the cladding tube vertically (= at right angles). In addition, the medium may strike the cladding tube at an angle β in the range of -90 ≤ β ≤ 90 °, the angle β being in a second plane perpendicular to the first plane, or alternatively the medium may be inclined at an angle β in the range of -. Hit 90 ≤ β <0 and 0 <β ≤ 90 ° on the cladding tube. An angle β of 0 ° in the second plane would mean parallel to the longitudinal axis of the cladding tube. Preferably, the angle β is in the range of -75 ° ≦ β ≦ -60 ° and 60 ° ≦ β ≦ 75 °, and more preferably in the range of -70 ° <β ≦ -65 ° and 65 ° ≦ β ≦ 70 °.

According to a particular embodiment of the present invention, the medium guiding device comprises an annular plate having at least one bore which extends from the bottom to the top of the plate at an angle greater zero to the major surface of the plate, or with a circumferential slot extending from the bottom to Upper surface of the plate at an angle greater than zero to the main surface of the plate extends, wherein the main surface of the plate is at right angles to the longitudinal direction of the cladding tube.

Advantageously, the bore has a diameter in the range of at least 0.5 mm, preferably at least 1 mm and particularly preferably at least 20 mm.

Conveniently, it has at least one ultrasonic source on or in the wall of the vessel for acting on the medium in the vessel with ultrasound. The at least one ultrasonic source serves to act on the liquid medium. The ultrasound kills ultrasound as the main cause of mechanical cell breakage. In addition to the mechanical erosion of the cell wall, the strong pressure and temperature changes induce the polymerization reactions inside the cell, which lead to the degradation of globular proteins. These are split into their subunit, whereby their quaternary structure is first destroyed. In this context, apart from the separation of low monoclonal peptides, the breakdown of cyclic amino acids has also been observed.

In the system according to the invention it can be provided that the filter device comprises a preferably cylindrical filter vessel having an inlet as the inlet and an outlet as the outlet, which is in fluid communication with the inlet of the UV light irradiation device, and a mechanical filter in the filter vessel ,

Advantageously, the filter device has an activated carbon filter in the filter vessel.

The filter device expediently has at least one UV radiation source.

According to a particular embodiment of the system, the UV radiation source is arranged on a longitudinal axis of the vessel and the mechanical filter and the activated carbon filter are arranged concentrically thereto.

Conveniently, the inlet of the filter vessel is arranged on an extension of the longitudinal axis of the filter vessel.

In addition, it can be provided that the mechanical filter is arranged inside the activated carbon filter.

Advantageously, the outlet of the filter device is in fluid communication with the inlet of the UV light irradiation device via a flow monitor.

Furthermore, it can be provided that the system has a medium supply line via which the inlet of the filter device is in fluid communication with a medium feed.

Advantageously, the system has a medium drain line, via which the outlet of the UV light irradiation device is in fluid communication with a medium drain.

Insbesondre can be provided that the system has a bypass line, by means of which a fluid connection between the medium supply line and the medium flow can be produced.

According to a further particular embodiment of the present invention, the system has a cleaning fluid reservoir and a cleaning fluid supply line which is connected between the cleaning fluid reservoir and the medium supply line.

Conveniently, the filter device has a backwash inlet and the system has a backwash line, which between the Backwash inlet and the bypass line is connected.

It is also advantageous if the system has a circulation line system which is connected between the cleaning liquid supply line and the medium drain line.

Conveniently, the UV light irradiation device has a cleaning liquid outlet and the plant has a cleaning liquid discharge line connected between the cleaning liquid outlet and a cleaning liquid outlet.

In particular, it may be provided that the cleaning fluid drain line is additionally connected to the cleaning fluid supply line.

In a particular embodiment or as a separate variant thereof, the present invention provides a method of operating a plant according to any one of claims 6 to 21, the method comprising: before and / or after an eliminating operation performing a cleaning liquid cleaning liquid from the cleaning liquid reservoir.

Advantageously, the cleaning process is performed after a predeterminable time of Eliminierbetriebs and / or depending on the measured degree of contamination of the cladding tube.

In particular, it may be provided that the cleaning liquid is pumped from the cleaning liquid reservoir via the cleaning liquid supply line in the filter device and then in the UV light irradiation device for a predetermined time and then the cleaning liquid through the circulation line in the circuit through the filter device and the UV light Radiation device is pumped for a predetermined time.

Advantageously, the cleaning liquid is rinsed out after a predetermined time on the cleaning liquid drain line.

Finally, advantageously after the filter device is backwashed via the backwash line for a predetermined time.

The present invention is based on the surprising finding that, due to the special flow direction in which a liquid medium to be irradiated and / or a cleaning liquid meets the cladding tube, contamination of the cladding tube does not even occur or is reduced or quickly removed again, and / or that by the specific flow rate of the liquid medium to be irradiated and / or the cleaning liquid, contamination of the cladding tube is avoided, reduced, or quickly removed again. In addition or alternatively, z. B. intermittently carried out a cleaning of the cladding tube and / or the filter device.

Further features and advantages of the invention will become apparent from the appended claims and the following description in which two embodiments are explained in detail with reference to the schematic drawings. Showing:

1 a side view of a UV light irradiation device according to a particular embodiment of the present invention;

2 a vertical sectional view of the UV light irradiation device of 1 ;

3 a side view of a mechanical filter device of a system according to a particular embodiment of the present invention;

4 a vertical sectional view of the mechanical filter device of 3 ;

5 a Lockschaltbild a system according to a particular embodiment of the present invention.

Hereinafter, a description will be made of a UV light irradiation apparatus 10 according to a particular embodiment of the present invention to the 1 and 2 Referenced. The UV light irradiation device 10 for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow comprises a substantially cylindrical vessel and closed at the top and bottom 12 with an upper inlet 14 and also an upper outlet 16 , which in this example is the outlet 16 above the inlet 14 located. Furthermore, in the vessel 12 along the longitudinal axis of an elongated UV radiation source 18 or a UV rod arranged by a UV-transmissive cladding 20 z. B. concentric quartz glass is surrounded. It also surrounds a UVC-permeable tube 22 with an inner diameter, in this example between about 0.5 millimeters to about 20 millimeters larger than the outer diameter of the cladding tube 20 is, the cladding 20 concentric. Between the cladding tube 20 and the tube 22 Thus, there is an annular space or an annular inner UV treatment area 24 and outside the tube 22 another annulus or annular outer UV treatment area 26 , Of the outer UV treatment area 26 stands with the inlet 14 in fluid communication and with the inner UV treatment area 24 via a medium guiding device 28 in fluid communication. The medium guiding device 28 has an annular plate 30 on, concentrically around the cladding tube 22 in the lower part of the vessel 12 is arranged. It stands on the inside with the cladding tube 20 in direct contact and at the top with the pipe 22 in direct contact. In the plate 30 There are two holes 32 and 34 with in this example a diameter of at least 0.5 millimeters, extending from the bottom of the plate 30 obliquely upwards and inwards to the top of the plate 30 extend, wherein the angle α to the outer surface of the cladding tube 20 in the representation plane (drawing plane) in the present example is about 45 degrees. In this example, the holes are 32 and 34 even in the plane perpendicular to the plane of representation at an angle β (not shown) to the outer surface of the cladding tube 20 arranged. The angle β may be in the range of -90 ° ≤ β ≤ 90 °. A medium to be irradiated or a cleaning liquid occurs - as indicated by the arrows - thus through the inlet 14 into the vessel 12 and then flows down substantially vertically. In the lower part of the vessel 12 it then changes its flow direction. It then flows essentially horizontally inward and then through the hole 32 respectively. 34 diagonally upwards. Then it flows between the inner cladding tube 20 and the outer tube 22 essentially vertically upward and leaves the vessel in the upper area 12 essentially horizontally outward through the outlet 16 , Because both the cladding tube 20 as well as the pipe 22 Being UV-transmissive, the medium is both on its way vertically downwards and on its way vertically upwards with UV light from the UV radiation source 18 irradiated. By the oblique impingement of the medium to be irradiated on the cladding tube 20 a cleaning of the surface of the same. This allows the radiated by the medium power of the UV radiation source 18 increase. This in turn leads to a higher efficiency in terms of disinfection and elimination of microbiological contamination and microbiological toxins contained therein. As will be explained in more detail below, a cleaning of the cladding tube can additionally 20 be done by using cleaning fluid at certain intervals and / or depending on the degree of contamination. Due to the inclination of the bore (s) can (also) a rotation of the liquid can be achieved.

Advantageously, the UV light irradiation device is operated such that the medium to be irradiated or a cleaning liquid in the annular space between the cladding tube 20 and the tube 22 has a flow rate of more than 8 meters per second.

As also from the 1 and 2 results are on the outside of the vessel 12 at a distance to each other in the vertical direction and circumferentially three sources of ultrasound 36 arranged. Said ultrasonic sources are in a frequency range of z. B. 20 kilohertz to 1.7 megahertz or z. B. 20 to 80 kilohertz operable. In general, it is advantageous if the ultrasound sources can generate ultrasound at a frequency of more than 10 kilohertz. At least one of the ultrasound sources can also be inside the vessel 12 be arranged.

In a plant according to a particular embodiment of the present invention, such as. B. in the plant 56 in 5 , that can be in the 1 and 2 shown UV light irradiation device 10 a filter device 38 be upstream. This can, for. B. be designed as in the 3 and 4 is shown. The filter device 38 has a cylindrical filter vessel 40 with in this example a lower central inlet 42 and in this example, an upper side outlet 44 and a cylindrical mechanical filter 46 on that in the filter vessel 40 is arranged concentrically to the longitudinal axis of the same. In the present example, the mechanical filter 46 a pore or mesh size of more than about 2 microns. Inside the cylindrical filter 46 extends in the filter vessel 40 in the longitudinal direction of an elongated or rod-shaped UV radiation source 48 , that of a piston-shaped or test tube-shaped cladding tube 50 is surrounded. The mechanical filter 46 is from an activated carbon filter 52 surrounded concentrically with in this example regenerable activated carbon. Because the active filter 46 even at its upper end has a horizontally extending portion flows to be irradiated medium or a cleaning liquid - as indicated by the arrows - from the bottom through the inlet 42 vertically upwards and then on both sides of the cladding tube 50 further out through the activated carbon filter 52 and from there, again, substantially vertically upward through the upper horizontal section of the mechanical filter 46 in an upper annular chamber 54 and from there substantially horizontally outward through the outlet 44 , The filter device 38 also serves to increase the efficiency of the UV light irradiation device and the UV radiation source 48 is used for additional disinfection or elimination of microbiological contamination and microbiological toxins as well as chemical contamination by means of UV light, in particular UVC light.

5 now shows a plant 56 for treating a liquid medium with ultraviolet light, in particular UVC light, preferably in flow with a UV light irradiation device 10 according to the 1 and 2 and an upstream filter device 38 according to the 3 and 4 ,

The outlet 44 the filter device 38 is over a connecting line 58 in which a river watchman 60 is arranged with the inlet 14 the UV light irradiation device 10 in fluid communication. The inlet 42 the filter device 38 is via a medium supply line 62 with a medium feed 64 in fluid communication. In the medium supply line 62 a valve V1 is arranged.

The outlet 16 the UV light irradiation device 10 is via a medium drain line 66 with a medium flow 68 in fluid communication. In the medium drain line 66 there is a valve V2.

Furthermore, the attachment points 56 a bypass line 70 on which the medium supply line 62 with the medium flow 68 can connect. In the bypass line 70 there is a valve V3.

Furthermore, the attachment 56 a cleaning fluid reservoir 72 and a cleaning liquid supply line 74 on the between the cleaning fluid reservoir 72 and the medium supply line 62 connected. In the line, a valve V6 and a pump PM are arranged. In the present example, the pump PM is connected downstream of the valve V6. It should also be noted that in the cleaning fluid supply line 74 behind the pump PM also a valve V9 is arranged. It is the valve V9 is a check valve.

Furthermore, the filter device 38 a backwash inlet 76 and the system has a backwash line 78 on that between the rewind inlet 76 and the bypass line is connected. In the backwash line 78 a valve V4 is arranged.

In addition, the attachment points 56 a circulation pipe 80 on, between the cleaning fluid supply line 74 and the medium drain line 66 connected. In this a valve V7 is arranged.

The UV light irradiation device 10 has a cleaning fluid outlet 82 on and the plant 56 has a cleaning fluid drain line 84 on, between the cleaning fluid outlet 82 and a cleaning fluid drain 86 connected. In the cleaning fluid drain line 84 a valve V8 is provided. The cleaning fluid drain line 84 is additionally via a connecting line 88 with the cleaning liquid supply line 74 connected. In the connection line 88 a valve V5 is arranged.

During normal operation (elimination operation) of the system 56 A liquid medium to be irradiated or disinfected flows through the opened valve V1 at least through the vessel 12 and via the open valve V2 to the medium drain 68 , The remaining valves V3 to V8 are closed.

In bypass mode, a liquid medium to be irradiated or disinfected flows directly from the medium inlet 64 via the open valve V3 to the medium drain 68 , The remaining valves V1, V2, V4, V5, V6, V7 and V8 are closed.

For pumping in cleaning fluid from the cleaning fluid reservoir 72 into the vessel 12 and the filter vessel 40 is the pump PM after opening the valve V6 over an adjustable period of z. B. operated more than one second. In order to avoid an increase in pressure, valve V8 opens and excess cleaning fluid flows to the cleaning fluid outlet 86 , After the end of the pumping time, the pump PM stops and closes the valves V6 and V8. During this phase, valve V3 may be both open and closed. Valves V1, V2, V4, V5, V6 and V8 are closed.

During the cleaning phase, the pump PM starts over a running time of approx. B. more than one minute, the cleaning fluid through at least the vessel 12 over the river watchman 60 and to pump through the valve V7 in the circuit. In this case, the valves V1, V2, V4, V5 V6 and V8 are closed. The valve V3 may be both open and closed during this phase.

To "rinse" the cleaning fluid from the system 56 pressed. Here, the valves V1 and V8 are opened, while the valves V2, V4, V5, V6 and V7 are closed. The valve V3 can also be opened or closed in this phase.

By backwashing the activated carbon filter 52 as well as the filter 46 be cleaned from contamination. During this process, the valves V1, V2, V6, V7 and V8 are closed. Valves V3, V4 and V5 are open.

During the cleaning operation, the ultrasonic sources are preferably 36 and UV radiation sources 18 and 48 in operation to support the cleaning process.

In general, the device or the system can be operated both in flow and in "standstill".

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential both individually and in any desired combinations for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

10

 UV-light irradiation device

12

 vessel

14

 inlet

16

 outlet

18

 UV radiation source

20

 cladding tube

22

 pipe

24

 UV treatment area

26

 UV treatment area

28

 Media guide device

30

 plate

32, 34

 drilling

36

 ultrasound sources

38

 filter means

40

 filter vessel

42

 inlet

44

 outlet

46

 filter

48

 UV radiation source

50

 cladding tube

52

 Activated carbon filter

54

 annular chamber

56

 investment

58

 connecting line

60

 flow Switch

62

 Medium supply line

64

 medium inlet

66

 Medium drain line

68

 medium flow

70

 Bypass line

72

 Cleaning fluid reservoir

74

 Cleaning fluid supply line

76

 Rückspüleinlass

78

 backwash

80

 circulation line

82

 Reinigungsflüssigkeitsauslass

84

 Cleaning fluid discharge line

86

 Cleaning liquid drain

88

 connecting line

α

 angle

PM

 pump

V1

 Valve

V2

 Valve

V3

 Valve

V4

 Valve

V5

 Valve

V6

 Valve

V7

 Valve

V8

 Valve

Claims (28)

UV light irradiation device ( 10 ) for irradiating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, comprising - a preferably cylindrical vessel ( 12 ) with an inlet ( 14 ) and an outlet ( 16 ) for a medium to be irradiated, - an oblong UV radiation source ( 18 ) in the vessel ( 12 ), - a UV radiation source ( 18 ) concentrically surrounding UV-transmissive cladding tube ( 20 ) in the vessel ( 12 ), - the cladding tube ( 20 ) to form an outer and an inner UV treatment area ( 26 ; 24 ) concentrically surrounding UV-transmissive tube ( 22 ) in the vessel ( 12 ), wherein the outer UV treatment area ( 26 ) with the inlet ( 14 ) is in fluid communication, the inner UV treatment area ( 24 ) with the outlet ( 16 ) is in fluid communication and the outer UV treatment area ( 26 ) with the inner UV treatment area ( 24 ) is in fluid communication so that the main flow direction of the medium to be irradiated in the outer UV treatment area ( 26 ) opposite to the main flow direction of the medium to be irradiated in the inner UV treatment region ( 24 ), characterized in that the outer UV treatment area ( 26 ) with the inner UV treatment area ( 24 ) via a medium guiding device ( 28 ) is in fluid communication, which is designed to transfer the medium to the cladding tube ( 20 ) obliquely. Contraption ( 10 ) according to claim 1, characterized in that the medium guiding device ( 28 ) is designed so that the medium in a first plane, which contains the longitudinal axis of the cladding tube, at an angle α in the range of 0 ° <α <90 on the cladding tube ( 20 ) meets. Contraption ( 10 ) according to claim 1 or 2, characterized in that the medium guiding device ( 28 ) an annular plate ( 30 ) with at least one bore ( 32 . 34 ) extending from the bottom to the top of the plate ( 30 ) at an angle α greater than zero to the main surface of the plate ( 30 ) or with a circumferential slot extending from the bottom to the top of the plate ( 30 ) at an angle greater than zero to the major surface of the plate ( 30 ), wherein the main surface of the plate ( 30 ) at right angles to the longitudinal direction of the cladding tube ( 20 ) runs. Contraption ( 10 ) according to claim 3, characterized in that the bore ( 32 ; 34 ) has a diameter in the range of at least 0.5 mm, preferably at least 1 mm and particularly preferably at least 20 mm. Contraption ( 10 ) according to one of the preceding claims, characterized in that it comprises at least one ultrasonic source ( 36 ) on or in the wall of the vessel ( 12 ) for charging the medium in the vessel ( 12 ) with ultrasound. Investment ( 56 ) for treating a liquid medium with ultraviolet light, in particular UVC light, preferably in the flow, comprising a UVC light irradiation device ( 10 ) according to any one of the preceding claims and optionally a filter device upstream of the UV light irradiation device ( 38 ) with an inlet ( 42 ) and an outlet ( 44 ). Investment ( 56 ) according to claim 6, characterized in that the filter device ( 38 ) a preferably cylindrical filter vessel ( 46 ) with an inlet as the inlet ( 42 ) and an outlet ( 44 ) as the outlet connected to the inlet ( 14 ) of the UVC light irradiation device ( 10 ) is in fluid communication, as well as a mechanical filter ( 46 ) in the filter vessel ( 40 ) having. Investment ( 56 ) according to claim 6 or 7, characterized in that the filter device ( 38 ) an activated carbon filter ( 52 ) in the filter vessel ( 40 ) having. Investment ( 56 ) according to one of claims 6 to 8, characterized in that the filter device ( 38 ) at least one UV radiation source ( 48 ) having. Investment ( 56 ) according to claim 9, characterized in that the UV radiation source ( 48 ) on a longitudinal axis of the filter vessel ( 40 ) and the mechanical filter ( 46 ) and the activated carbon filter ( 52 ) cylindrical and concentric with the longitudinal axis of the filter vessel ( 40 ) are arranged. Investment ( 56 ) according to claim 10, characterized in that the inlet ( 42 ) of the filter vessel ( 40 ) on an extension of the longitudinal axis of the filter vessel ( 40 ) is arranged. Investment ( 56 ) according to claim 10 or 11, characterized in that the mechanical filter ( 46 ) within the activated carbon filter ( 52 ) is arranged. Investment ( 56 ) according to one of claims 6 to 12, characterized in that the outlet ( 44 ) of the filter device ( 38 ) via a flow monitor ( 60 ) with the inlet ( 14 ) of the UV light irradiation device ( 10 ) is in fluid communication. Investment ( 56 ) according to one of claims 6 to 13, characterized in that it comprises a medium feed line ( 62 ) through which the inlet ( 42 ) of the filter device ( 38 ) with a medium feed ( 64 ) is in fluid communication. Investment ( 56 ) according to one of claims 6 to 14, characterized in that it has a medium drain line ( 66 ) through which the outlet ( 16 ) of the UV light irradiation device ( 10 ) with a medium flow ( 68 ) is in fluid communication. Investment ( 56 ) according to claim 15, characterized in that it comprises a bypass line ( 70 ), by means of which a fluid connection between the medium supply line ( 62 ) and the medium flow ( 68 ) can be produced. Investment ( 56 ) according to one of claims 14 to 16, characterized in that it comprises a cleaning fluid reservoir ( 72 ) and a cleaning fluid supply line ( 74 ) located between the cleaning fluid reservoir ( 72 ) and the medium supply line ( 62 ) is connected. Investment ( 56 ) according to claim 16 or 17, characterized in that the filter device ( 38 ) a backwash inlet ( 76 ) and the plant ( 56 ) a backwash line ( 78 ) located between the backwash inlet ( 76 ) and the bypass line ( 70 ) connected. Investment ( 56 ) according to claim 17 or 18, characterized in that it comprises a circulation line ( 80 ) between the cleaning fluid supply line ( 74 ) and the medium drain line ( 66 ) connected. Investment ( 56 ) according to one of claims 6 to 19, characterized in that the UV light irradiation device ( 10 ) a cleaning fluid outlet ( 82 ) and the plant ( 56 ) a cleaning liquid discharge line ( 84 ) between the cleaning fluid outlet ( 82 ) and a cleaning fluid outlet ( 86 ) connected. Investment ( 56 ) according to claim 20, characterized in that the cleaning fluid drain line ( 84 ) additionally with the cleaning liquid feed line ( 74 ) connected is. Method for irradiating a liquid medium with ultraviolet light, in particular UVC Light, preferably in flow through the use of a UV light irradiation device ( 10 ) according to one of claims 1 to 5 and / or an annex ( 56 ) according to one of claims 6 to 21. Method for operating a system ( 56 ) according to one of claims 6 to 21, wherein a medium to be irradiated at a speed of at least 8 meters / second between the outer tube ( 22 ) and the cladding tube ( 20 ) is allowed to flow. Method for operating a system ( 56 ) according to one of claims 6 to 21, in particular a method according to claim 23, wherein the method comprises: before and / or after an elimination operation performing a cleaning process with cleaning liquid from the cleaning liquid reservoir ( 72 ). A method according to claim 24, characterized in that the cleaning operation after a predetermined time of Eliminierbetriebs and / or depending on the measured degree of contamination of the cladding tube ( 20 ) is carried out. A method according to claim 24 or 25, characterized in that the cleaning liquid from the cleaning fluid reservoir ( 72 ) via the cleaning fluid supply line ( 74 ) in the filter device ( 38 ) and then into the UV light irradiation device ( 10 ) is pumped for a predetermined time and then the cleaning fluid via the circulation line ( 80 ) in the circuit through the filter device ( 38 ) and the UV light irradiation device ( 10 ) is pumped for a predetermined time. A method according to claim 26, characterized in that the cleaning liquid after a predetermined time on the cleaning liquid discharge line ( 84 ) is rinsed out. Method according to claim 26 or 27, characterized in that thereafter the filter device ( 38 ) via the backwash line ( 78 ) is backwashed for a predetermined time.

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