Embodiments described herein relate generally to an ultraviolet water treatment device.
An ultraviolet ray has an effect such as sterilization, disinfection, decolorization, and deodorization of water, or bleaching of pulp. In addition, the ultraviolet ray has a characteristic capable of immediately coping by adjusting power of a lamp with respect to change of water quality and water quantity. For this reason, in order to perform sterilization, disinfection, and decolorization of water supply and drainage, deodorization and decolorization of industrial water, or bleaching of pulp, there is a case of using an ultraviolet water treatment device.
As an ultraviolet water treatment device in the related art, for example, three representative types are known.
As the first type, a structure is known in which a cylindrical water flow body and a cylindrical lamp housing of the same diameter as that of the water flow body are joined to cross, and a plurality of ultraviolet irradiation pipes formed of quartz glass housing an ultraviolet lamp therein are mounted in parallel to a lamp housing axis in the lamp housing. Since the ultraviolet water treatment device of the first type may be directly installed in a treated water main pipe of a water treatment facility, extra branched and confluent pipes are not necessary, and thus there is an advantage of reducing an installation space. On the other hand, in the ultraviolet water treatment device of the first type, lengths or the number of ultraviolet lamps are restricted for a compact structure. For this reason, when the ultraviolet water treatment device of the first type is used for the purpose other than design specifications, there is an inconvenience that an expansion pipe or a reduction pipe for installation is necessary since a water flow body diameter is too larger or too small with respect to treatment flow quantity, and there is an inconvenience that an ultraviolet irradiation amount is insufficient since the number of housed lamps is restricted.
As a second type, a structure is known in which a cylindrical water flow body and a lamp housing configured by a circular pipe with a diameter smaller than the water flow body are joined to cross, a plurality of ultraviolet irradiation pipes formed of quartz glass housing an ultraviolet lamp therein are mounted in parallel to a lamp housing axis in the lamp housing. In the ultraviolet water treatment device of the second type, even when the water flow pipe diameter is large and further a necessary ultraviolet amount is different, it is possible to appropriately increase and decrease the number of lamp housings, and thus there is an advantage that it is suitable for a relatively large scale treatment facility. On the other hand, when the ultraviolet water treatment device of the second type is used in a treatment facility requiring a large ultraviolet irradiation amount with a small treatment amount, similarly, the water flow body pipe diameter of the ultraviolet water treatment device is too large or too small with respect to the treated water main pipe diameter of the treatment facility, and thus there is an inconvenience that an expansion pipe or a reduction pipe for installation is necessary and an excessive installation space is necessary.
As a third type, a structure is known in which irradiation pipes of a plurality of lines housing an ultraviolet lamp in a quartz glass pipe are arranged in a rectangular ultraviolet irradiation body in a direction perpendicular to a flow direction of the treated water, a plurality of irradiation pipe rows with the same structure are disposed in the flow direction, a cross-section shape change connection unit that connects a circular cross-section of the treated water main pipe diameter of the applied treatment facility to a rectangular cross-section of a rectangular ultraviolet irradiation body with a rectangular cross-section while changing the cross-sectional shape is provided as an inlet and an outlet of the treated water. In the ultraviolet water treatment device of the third type, there are an advantage that it is possible to increase the number of stages of the irradiation pipe rows constituting the ultraviolet irradiation body according to the necessary ultraviolet irradiation amount, and an advantage that it is possible to change the inlet and the outlet according to the pipe diameter of the facility. However, in the third type, there is an inconvenience that the cross-sectional shape changing and connecting unit for connecting the facility pipe diameter to the rectangular ultraviolet irradiation body increases the installation space of the ultraviolet water treatment device.
As described above, in the representative ultraviolet water treatment device of the related art, there is a case where a convenience requiring excessive large installation space occurs by the expansion pipe, the reduction pipe, or the cross-sectional shape change and connection unit.
As a technique which can resolve the convenience, an ultraviolet water treatment device is known. The ultraviolet water treatment device includes an ultraviolet lamp unit that is provided with first piping flange joints on both ends and is provided with an ultraviolet irradiation pipe including an ultraviolet lamp and a lamp protective pipe protecting the ultraviolet lamp therein, and a cleaning device driving unit that is provided with second piping flange joints on both ends and drives a cleaning device cleaning a surface of the lamp protective pipe. The ultraviolet lamp unit and the cleaning device driving unit of the ultraviolet water treatment device are connected at the first and second piping flange joint portions.
In the ultraviolet water treatment device, even when the water type or water quantity is changed, it is possible to simply exchange the ultraviolet lamp unit to a separate ultraviolet lamp unit, and there is an advantage that it is possible to easily introduce the ultraviolet water treatment device into the existing water treatment facility. For example, in a facility requiring three ultraviolet irradiation pipes, one ultraviolet lamp unit including three ultraviolet irradiation pipes is provided, and in a facility requiring six ultraviolet irradiation pipes, two ultraviolet lamp units including three ultraviolet irradiation pipes are provided.
The ultraviolet water treatment device has any problem. However, according to study of the inventor, there is room for improvement in the point how a just enough number of ultraviolet irradiation pipes with respect to conditions of treated water (the water type and water quantity) are provided. Specifically, in a facility requiring the number of ultraviolet irradiation pipes other than multiplies of 3, there is room for improvement in the point how the ultraviolet lamp units are provided. For example, the facility requiring two ultraviolet irradiation pipes is provided with one ultraviolet lamp unit including two ultraviolet irradiation pipes, the facility requiring four ultraviolet irradiation pipes is provided with one ultraviolet lamp unit including four ultraviolet irradiation pipes, and the facility requiring five ultraviolet irradiation pipes is provided with one ultraviolet lamp unit including five ultraviolet irradiation pipes. As described above, when four kinds of ultraviolet lamp units are produced according to two to five ultraviolet irradiation pipes, a production cost is high. For this reason, there is room for improvement in the point how the ultraviolet lamp units are provided to reduce the production cost.
An object of the present invention is to provide an ultraviolet water treatment device which can be easily introduced into the existing water treatment facility even when a water type or water quantity is changed, without requiring an expansion pipe, a reduction pipe, and a cross-sectional shape change and connection unit, in which it is possible to reduce a production cost.
In general, according to one embodiment, an ultraviolet water treatment device of an embodiment includes an ultraviolet irradiation tank, a treated water supply inlet pipe, and a treated water discharge outlet pipe.
The ultraviolet irradiation tank includes a plurality of ultraviolet irradiation modules.
The plurality of ultraviolet irradiation modules include a plurality of ultraviolet irradiation pipes, a cleaning device, and a cleaning device driving unit.
The plurality of ultraviolet irradiation pipes include a plurality of ultraviolet lamps, and a plurality of ultraviolet lamp protective pipes individually protecting the ultraviolet lamps.
The cleaning device cleans a surface of each ultraviolet lamp protective pipe.
The cleaning device driving unit drives the cleaning device.
The inlet pipe has a center axis in a direction perpendicular to a center axis of each ultraviolet irradiation pipe and is connected to an end of the ultraviolet irradiation tank.
The outlet pipe is connected to the other end of the ultraviolet irradiation tank.
Each ultraviolet irradiation module includes two ultraviolet irradiation pipes or three ultraviolet irradiation pipes.
Hereinafter, embodiments will be described with reference to the drawings.
An ultraviolet water treatment device 21 is provided with a non-treated water supply inlet pipe 22, a treated water discharge outlet pipe 23 disposed on the same axis as that of the inlet pipe 22, and an ultraviolet irradiation tank 100n formed of a plurality of ultraviolet irradiation units 100.
The inlet pipe 22 and the outlet pipe 23 are on the same axis, and the inlet pipe 22 has a center axis in a direction perpendicular to a center axis of each ultraviolet irradiation pipe 30 and is connected to an end of the ultraviolet irradiation tank 100n.
The outlet pipe 23 is connected to the other end of the ultraviolet irradiation tank 100n.
The ultraviolet irradiation tank 100n is provided with a plurality (for example, two) of ultraviolet irradiation modules 103 that includes a plurality (for example, three) of ultraviolet irradiation pipes 30 including a plurality (for example, three) of ultraviolet lamps 31 and a plurality (for example, three) of ultraviolet lamp protective pipes 32 individually protecting the ultraviolet lamps 31, a cleaning device 40 cleaning a surface of each ultraviolet lamp protective pipe 32, and a cleaning device driving unit 50 driving the cleaning device 40. In this example, the ultraviolet irradiation tank 100n is formed of the plurality of ultraviolet irradiation units 100 in which the plurality of ultraviolet irradiation module 103 are individually incorporated, and the ultraviolet irradiation units 100 are integrally disposed in a line. In addition, the ultraviolet irradiation tank is not limited to the structure formed of the plurality of ultraviolet irradiation units, and may have an integral structure formed of pipes in which the ultraviolet irradiation modules are integrated as described in second and third embodiments.
Herein, enlargement of the ultraviolet irradiation module 103 having three ultraviolet irradiation pipes 30 is illustrated in
The ultraviolet irradiation units 100 have a box shape having a side with a length equal to or more than the outer diameter of the inlet pipe 22 or the outlet pipe 23, and are coupled by welding, and the vicinity of the coupled portion is rib-processed to reinforce the strength of the unit. In addition, since each ultraviolet irradiation unit 100 has the box shape, the ultraviolet irradiation tank 100n formed of the ultraviolet irradiation units 100 also has the box shape. In addition, the ultraviolet irradiation unit 100 is not limited to the box shape, and may be changed to a unit having a cylindrical shape having an inner diameter equal to or more than the outer diameter of the inlet pipe 22 or the outlet pipe 23.
The side face of one ultraviolet irradiation unit 100 is connected to the inlet pipe 22, and the side face opposite to the face connected to the inlet pipe 22 of the other ultraviolet irradiation unit 100 is connected to the outlet pipe 23. On the front face of each ultraviolet irradiation unit 100, an opening portion is provided to install each ultraviolet irradiation module 103. Each cover flange 101 of each ultraviolet irradiation module 103 is screw-fixed to the opening portion in a watertight structure by a watertight rubber packing (not illustrated) or the like. Accordingly, as necessary, each ultraviolet irradiation module 103 is detached such that the inside of each ultraviolet irradiation unit 100 is openable.
On each cover flange 101 (the front face) and the rear face of each ultraviolet irradiation unit 100, three ultraviolet lamp protective pipes 32, a screw-shaped cleaning device driving shaft (a rotation shaft) 51 moving the cleaning device 40, and a guide rail 52 are fixed in parallel (perpendicular to the center axes of the inlet pipe 22 and the outlet pipe 23) with the center axis of the ultraviolet irradiation unit 100 by the ultraviolet lamp (protective pipe) fixture 53, the driving shaft fixture 54, and the guide rail fixture 55, respectively.
Herein, the ultraviolet irradiation module 102 having two ultraviolet irradiation pipes 30 is illustrated in
Differently from the number illustrated in
That is, in the ultraviolet irradiation tank 100n, any one or both of the ultraviolet irradiation module 102 having two ultraviolet irradiation pipes 30 and the ultraviolet irradiation module 103 having three ultraviolet irradiation pipes 30 is incorporated.
Next, a method of adopting the module and the ultraviolet lamp of the ultraviolet irradiation unit will be described.
Meanwhile, a diameter of a pipe used in the water treatment facility or the like is adopted such that the maximum water flow rate is about 2.5 to 3.0 [m/sec] generally considering treatment flow quantity and pressure loss reduction in the pipe. However, the inlet pipe 22 and the outlet pipe 23 of the embodiment having the inner diameter in which the flow rate is within the range of 2.5 to 3.5 [m/sec] with respect to the maximum treatment water quantity of the ultraviolet irradiation tank 100n is adopted. In
Each ultraviolet irradiation unit 100 is configured by combination of the ultraviolet lamps in which the water flow body inner diameter and the light emission length Li are equivalent, considering the water flow body as a standard product illustrated in
Next, in
In addition, in the embodiment, indicator bacteria (coliphage MS2) is irradiated with the ultraviolet ray, and difference in water quality is considered when installing the ultraviolet lamps 31 of the number of lamps in which reduction equivalent ultraviolet dose (RED) obtained by biologically converting the ultraviolet irradiation amount from the inactivation amount of the indicator bacteria is a value equal to or more than 40 [mJ/cm2]. The water quality means ultraviolet transmittance (UVT) of the treatment target water.
That is, the total number of lamps of the ultraviolet water treatment device 21 is different according to the treatment flow quantity, the water quality, and the power of the adopted lamps. For example, when the flow quantity is 50,000 to 200,000 m3/d, the ultraviolet transmittance (UVT) is equal to or more than 70%, and the adopted lamps are C, E, and F, it is necessary to provide 4 to 21 lamps.
Particularly, in the ultraviolet water treatment device for water purification, there are many cases where the ultraviolet transmittance (UVT) is designed equal to or more than 95%. In that case, 4 to 9 ultraviolet lamps 31 are combined. In addition, as the combination in which the inner diameters of the inlet pipe 22 and the outlet pipe 23 and the light emission length are equivalent, in the embodiment, the ultraviolet lamp in which the light emission length is in the range of ±200 mm of the pipe diameter is selected.
As described above, the ultraviolet irradiation module 103 (three ultraviolet irradiation pipes) and the ultraviolet irradiation module 102 (two ultraviolet irradiation pipes) are selected and incorporated in the ultraviolet irradiation unit 100 so as to be the predetermined number of lamps. In addition, in the embodiment, the reduction equivalent ultraviolet dose (RED) in which the indicator bacteria is the number of lamps in which the coliphage MS2 is the value equal to or more than 40 [mJ/cm2]. Also for the other bacteria, it is preferable to combine the ultraviolet irradiation module 103 (three ultraviolet irradiation pipes) and the ultraviolet irradiation module 102 (two ultraviolet irradiation pipes) so as to be the total number of lamps capable of irradiating the irradiation amount of the value equal to or more than the reduction equivalent ultraviolet dose obtained from the inactivation amount of the bacteria.
The cleaning device 40 includes a cleaning brush 41 that is provided to rub the surface of the ultraviolet lamp protective pipe 32, and a lamp protective pipe cleaning plate 42 that fixes the cleaning brush 41. The lamp protective pipe cleaning plate 42 is fixed in the box-shaped ultraviolet irradiation unit 100 through the cleaning device driving shaft 51 and the guide rail 52. The lamp protective pipe cleaning plate 42 has a female screw cut hole, and the screw-shaped cleaning device driving shaft 51 is coupled and fitted to the hole by a screw operation. That is, the lamp protective pipe cleaning plate 42 is coupled with the screw-shaped cleaning device driving shaft 51 by screw. The cleaning device driving shaft 51 is fixed to each cover flange 101 on the front face of each ultraviolet irradiation module 103 and the rear face of each ultraviolet irradiation unit 100, in a structure of rotating while keeping watertight with the driving shaft fixture 54. One end of the cleaning device driving shaft 51 is connected to the driving motor (not illustrated). Similarly, the guide rail 52 is fixed to the ultraviolet irradiation unit 100 by the guide rail fixture 55. When the driving motor rotates the cleaning device driving shaft 51 in a forward rotation direction and a backward rotation direction at a predetermined time interval, the lamp protective pipe cleaning plate 42 moves forward and backward along the cleaning device driving shaft 51 according to the screw operation based on the rotation. At this time, the cleaning brush 41 fixed to the lamp protective pipe cleaning plate 42 moves forward and backward along the lamp protective pipe 32 while rubbing the surface of the ultraviolet lamp protective pipe 32.
Next, an operation of the ultraviolet water treatment device configured as described above will be described.
The treated water 60 passes from the left side (the paper face front side of
As described above, according to the first embodiment, by the configuration provided with the ultraviolet irradiation tank 100n formed of the plurality of ultraviolet irradiation unit 100 in which the plurality of ultraviolet irradiation modules 102 and 103 each having two ultraviolet irradiation pipes 30 or three ultraviolet irradiation pipes 30 are individually incorporated, it is possible to easily introduce the configuration into the existing water treatment facility even when the water type or water quantity is changed, without requiring the expansion pipe, the reduction pipe, and the cross-sectional shape change and connection unit, and it is possible to reduce the production cost.
In addition, according to the first embodiment, even in the facility requiring a number of ultraviolet irradiation pipes other than multiplies of 3, it is possible to cope by the combination of two kinds of ultraviolet irradiation modules 102 and 103 having two or three ultraviolet irradiation pipes 30, and thus it is possible to reduce the production cost. For example, in the related art, in the facility requiring two or five ultraviolet irradiation pipes, it is necessary to produce four kinds of ultraviolet lamp units according to two to five ultraviolet irradiation pipes, and thus the production cost is high. On the other hand, in the embodiment, in the facility requiring two to five ultraviolet irradiation pipes, two ultraviolet irradiation modules 102 having two ultraviolet irradiation pipes may be provided in the facility requiring four ultraviolet irradiation pipes, the ultraviolet irradiation module 102 having two ultraviolet irradiation pipes and the ultraviolet irradiation module 103 having three ultraviolet irradiation pipes may be provided in the facility requiring five ultraviolet irradiation pipes, and thus it is possible to reduce the production cost as compared with the related art.
Further, for example, the following effects (1) to (3) can be obtained.
(1) According to the first embodiment, the configuration is achieved by the ultraviolet lamp 31 in which the pipe inner diameter and the ultraviolet emission unit length are equivalent, the treated water 60 is irradiated with the ultraviolet ray generated from the ultraviolet lamp 31 without waste, and it is possible to contribute to disinfection (sterilization) of treated target substances of microorganisms, organic matters, or inorganic matters in the treated water 60 or oxidation treatment. In addition, according to the first embodiment, particularly, the number of units in which the ultraviolet module 103 of three ultraviolet irradiation pipes and two ultraviolet irradiation modules 102 are combined is merely changed, and thus it is possible to obtain a sufficient irradiation amount even when the total number of necessary lamps is any one of an odd number or an even number with respect to all the treatment conditions (the ultraviolet irradiation amount, the treatment flow quantity, the water quality (the ultraviolet transmittance (UVT) of the treatment target water)), as the target of the ultraviolet water treatment device 21.
(2)
In a case of the ultraviolet water treatment device illustrated in
On the other hand, in the first embodiment, the ultraviolet lamp 31 with the long light emission length (corresponding to the pipe diameter) is adopted in advance, the box-shaped unit larger than the pipe diameter is connected to the inlet pipe 22 and the outlet pipe 23, and thus it is possible to efficiently irradiate the treated water 60 with all the ultraviolet rays emitted from the ultraviolet lamps 31 to perform disinfection (sterilization) or oxidation treatment.
(3) Three or two ultraviolet lamps 31 and the cleaning device 40 are integrated as the ultraviolet irradiation module 103 (three ultraviolet irradiation pipes) or the ultraviolet irradiation module 102 (two ultraviolet irradiation pipes). The ultraviolet irradiation modules 103 and 102 are fixed to the ultraviolet irradiation units 100 by the cover flange 101, the ultraviolet lamp (protective pipe) fixture 53, the driving shaft fixture 54, and the guide rail fixture 55. Each ultraviolet irradiation module 100 may be drawn out for each of the cover flange 101 by only removing the fixtures 53 to 55, and thus it is easy to maintain the inside of the ultraviolet irradiation unit 100, particularly, the cleaning device 40. In addition, the ultraviolet irradiation module 103 (three ultraviolet irradiation pipes) or the ultraviolet irradiation module 102 (two ultraviolet irradiation pipes) is miniaturized by modularizing three or two ultraviolet irradiation pipes 30. For this reason, it is easy to draw the modules 102 and 103 out of the ultraviolet irradiation unit 100, and it is easy to maintain the inside of the unit, particularly, the cleaning device 40.
The second embodiment is a modification example of the first embodiment, an ultraviolet water treatment device 71 is provided with an ultraviolet irradiation tank 72 in an integral structure formed of a rectangular pipe in which four ultraviolet irradiation modules 102 (two ultraviolet irradiation pipes) are incorporated, instead of the ultraviolet irradiation tank 100n formed of the ultraviolet irradiation units 100 illustrated in
According to the configuration described above, in addition to the effect of the first embodiment, it is not necessary to produce and weld the plurality of ultraviolet irradiation units 100, and thus it is possible to reduce the production process, and to reduce the production cost. Particularly, when the flow quantity is large, the pipe diameter of the low UVT is equal to or more than 1000 A, and the number of lamps is large, and when only the module is produced and the ultraviolet irradiation tank 72 is processed to fix the module, it is possible to shorten a production period, and it is possible to reduce the production cost.
In addition, by changing the heights of the ultraviolet irradiation modules 102 and 103, when the flow quantity is large, the pipe system of the low UVT is 1000 A, and the number of lamps is large, it is possible to irradiate the area of the upper portion and the lower portion of the ultraviolet irradiation tank 72 getting away from the ultraviolet lamp 31 with sufficient ultraviolet rays, and thus it is possible to improve treatment efficiency. As a result, it is possible to reduce a power cost and the total number of necessary lamps, and thus it is possible to reduce the production cost.
The third embodiment is a modification example of the first embodiment, an ultraviolet water treatment device 81 is provided with an ultraviolet irradiation tank 82 in an integral structure formed of a cylindrical pipe in which four ultraviolet irradiation modules 102 (two ultraviolet irradiation pipes) are incorporated, instead of the ultraviolet irradiation tank 100n formed of the ultraviolet irradiation units 100 illustrated in
According to the configuration described above, in addition to the effect of the first embodiment, it is possible to use a cylindrical pipe of a general marketed product as the ultraviolet irradiation tank 82, and thus it is possible to shorten the production period, and to reduce the production cost.
In addition, similarly to the second embodiment, by changing the heights of the ultraviolet irradiation modules 102 and 103, when the flow quantity is large, the pipe system of the low UVT is 1000 A, and the number of lamps is large, it is possible to irradiate the area of the upper portion and the lower portion of the ultraviolet irradiation tank 82 getting away from the ultraviolet lamp 31 with sufficient ultraviolet rays, and thus it is possible to improve treatment efficiency. As a result, it is possible to reduce a power cost and the total number of necessary lamps, and thus it is possible to reduce the production cost.
According to at least one of the embodiments described above, by the configuration provided with the ultraviolet irradiation tank 100n, 72, or 82 in which the plurality of ultraviolet irradiation modules 102 and 103 each having two ultraviolet irradiation pipes 30 or three ultraviolet irradiation pipes 30 are individually incorporated, it is possible to easily introduce the configuration into the existing water treatment facility even when the water type or water quantity is changed, without requiring the expansion pipe, the reduction pipe, and the cross-sectional shape change and connection unit, and it is possible to reduce the production cost.
While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
Number | Date | Country | Kind |
---|---|---|---|
2012-052150 | Mar 2012 | JP | national |
This is a Continuation Application of PCT application No. PCT/JP2013/052029, filed on Jan. 30, 2013, which was published under PCT Article 21(2) in Japanese. This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-52150, filed on Mar. 8, 2012; the entire contents of which are incorporated herein by reference.
Number | Date | Country | |
---|---|---|---|
Parent | PCT/JP2013/052029 | Jan 2013 | US |
Child | 14479199 | US |