JP2008093549A - Water purification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water purification device which has a high purification function with a simple structure. <P>SOLUTION: The water purification device 1 includes a water treatment tank 3 for storing raw water introduced from an introduction port 9 and leading out the raw water from a lead-out port 11, an ultraviolet lamp 5 disposed in the water treatment tank 3, and a filter 7 formed in a cylindrical shape and inserting the ultraviolet lamp 5 through the center. In the filter 7, titanium oxide is carried by a base material 23, and a number of water passing holes 25 are formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water purification apparatus that purifies water such as groundwater, industrial water, drainage, circulating water, and domestic drinking water.

  In Patent Document 1, a sheet carrying titanium dioxide is arranged on the inner surface of a water treatment tank, and an ultraviolet lamp is inserted into the liquid treatment tank, and the decomposition and sterilization action of ammonia and organic matter by ultraviolet irradiation, a photocatalyst A water purification device that purifies water introduced into a water treatment tank by using the decomposition and sterilization actions of ammonia and organic substances by the above is disclosed.

  In the technique of Patent Document 1, the titanium dioxide carrying sheet placed on the inner surface of the water treatment tank is irradiated with the light of an ultraviolet lamp placed in the water treatment tank to photoactivate the titanium dioxide and promote the sterilization action by the photocatalyst. Yes.

JP 7-39273 A

  However, since the ultraviolet lamp and the titanium dioxide-carrying sheet have a predetermined distance, there is a limit to the light activation effect of the ultraviolet lamp, and the titanium dioxide-carrying sheet cannot exhibit a sufficient photocatalytic function.

  In addition, since the titanium dioxide-carrying sheet is only disposed on the inner peripheral surface of the water treatment tank, there is a problem that the photocatalytic function cannot be fully utilized because the contact area with the raw water in the treatment tank is limited.

  Then, this invention aims at providing the water purification apparatus which has a high purification function by simple structure.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a water treatment tank that retains raw water introduced from the introduction port and leads out from the discharge port, and an ultraviolet lamp that is disposed in the water treatment tank. A filter having a columnar shape and a UV lamp inserted through the central portion thereof, the filter supporting titanium oxide on the base material, and having a plurality of three-dimensional network structure water passage holes. Features.

  The titanium oxide is preferably anatase type titanium dioxide.

  The filter substrate is preferably made of alumina, carbon, fiber or the like.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the base material of the filter is made of a foam.

  According to a third aspect of the present invention, in the first aspect of the present invention, a plurality of filters are arranged in the longitudinal direction of the ultraviolet lamp.

  The invention described in claim 4 is the invention described in claim 1, wherein the ultraviolet lamp is housed in a quartz transparent tube, and the Teflon (registered trademark) is provided between the transparent tube of the ultraviolet lamp and the filter. It is characterized in that a spacer made of a material excellent in deterioration resistance performance due to ultraviolet rays such as is arranged.

  The invention described in claim 5 is characterized in that, in the invention described in claim 1, air or ozone is supplied into the water treatment tank and aeration is performed.

  The invention described in claim 6 is the invention described in claim 1, wherein the introduction port is a connection port to which a tap of a water supply is connected, and an ultraviolet lamp is suspended in the water treatment tank together with a filter so as to be freely pulled out. It is characterized by being.

  The invention described in claim 7 is characterized in that, in the invention described in claim 5, an oxidizing agent is supplied into the water treatment tank. As the oxidizing agent, hydrogen peroxide, sodium hypochlorite, chlorine dioxide or the like is used, but these may be used alone or in combination with ozone or the like.

  According to invention of Claim 1, the raw | natural water introduce | transduced in the water treatment tank from the inlet is sterilized by irradiation of an ultraviolet lamp. Further, since the raw water passes through a filter carrying titanium oxide, it is sterilized and purified by the photocatalytic function of titanium oxide, so that a high purification function can be obtained. In particular, the photocatalytic function of titanium oxide makes it possible to decompose ammonia and organic substances in the raw water.

  Titanium oxide can be used to decompose ammonia and organic substances, so that it is possible to reduce the amount of chemical injection for removing them.

  As a configuration in which the ultraviolet lamp is inserted into the filter carrying titanium oxide, the ultraviolet lamp and the titanium oxide are arranged close to each other, so that the photoactivity of titanium oxide by ultraviolet irradiation can be enhanced. Among the wavelength bands of ultraviolet lamps, generally, the wavelength of 185 nm is an ozone generating line, and the wavelength of 254 nm is a germicidal line. The photoactivity of titanium oxide can be obtained more effectively than the 375 nm ultraviolet light.

  Since the filter carrying titanium oxide has a large number of water passage holes, the contact area between the titanium oxide and the raw water can be increased, and the photocatalytic action can be enhanced.

  Since the filter is formed in a columnar shape and an ultraviolet lamp is arranged at the center, the titanium oxide can be irradiated with ultraviolet rays evenly. Further, the proximity irradiation of ultraviolet rays can be performed around the ultraviolet lamp.

  Since the filter has a water flow resistance, it is possible to prevent the raw water flowing in the water treatment tank from short-circuiting and flowing from the inlet to the outlet, and to improve the water purification efficiency by the ultraviolet irradiation and the photocatalytic function of titanium oxide. .

  According to invention of Claim 2, while having the effect of Claim 1, a filter is lightweight and easy to handle. In addition, a large number of water passage holes can be easily formed in the substrate.

  According to the third aspect of the present invention, the effects of the first aspect can be achieved, the filter can be easily repaired or replaced, and maintenance is easy.

  According to the fourth aspect of the present invention, the effects described in the first aspect can be achieved, the distance between the ultraviolet lamp and the filter can be kept uniform, and the filter can be easily positioned with respect to the ultraviolet lamp. In addition, by arranging a spacer between the transparent tube of the ultraviolet lamp and the filter, it is possible to prevent damage due to damage or scratches on the wall surface of the transparent tube due to impact or contact with the filter. Reduction of irradiation can be suppressed.

  According to the fifth aspect of the present invention, the effects of the first aspect are achieved, the purification of the raw water by oxidation is promoted by aeration with air or ozone, and the deposits on the filter are peeled off, so Clogging can be prevented.

  According to the invention described in claim 6, since the function and effect described in claim 1 can be achieved and the filter and the lamp can be pulled out from the water treatment tank at the same time, the ultraviolet lamp, the filter, and the water treatment tank Each maintenance is easy. In particular, in the case of a household water purification device attached to a tap of a water supply, it is possible to easily replace or clean a filter or an ultraviolet lamp.

  According to the invention described in claim 7, the effects described in claim 5 can be achieved, and by using an oxidizing agent in combination, the oxidative decomposition of the pollutant is promoted and the purification of the treated water is promoted. Can be achieved.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a longitudinal sectional view of a water purification device according to a first embodiment of the present invention, FIG. 2 is a perspective view of a filter, FIG. 3 is a transverse sectional view of the water purification device shown in FIG. FIG. 4 is a graph of an ammonia decomposition experiment in the filter according to the present embodiment, FIG. 5 is a graph of a soy sauce water decomposition experiment in the filter according to the present embodiment, and FIG. 6 is a graph showing the interval between the filter and the ultraviolet lamp. FIG. 7 is a graph showing the relationship between the fineness of the water passage holes and the water purification function, and FIG. 8 is a graph showing the spectral distribution of the ultraviolet lamp used in the present embodiment. FIG. 9 is a diagram showing a water purification apparatus according to the second embodiment.

  The water purification apparatus 1 according to the embodiment of the present invention is for industrial use, and is provided, for example, in a circulation path of a fish culture tank to maintain the quality of the circulating water. This water purification apparatus 1 includes a water treatment tank 3, an ultraviolet lamp 5, and a filter 7.

  The water treatment tank 3 has a cylindrical shape, a raw water introduction port 9 is provided in the lower part, and a discharge port 11 that leads out treated water is provided in the upper part. The raw water introduced from the introduction port 9 is treated with water. After staying in the tank 3, it is led out from the outlet 11.

  In the center of the water treatment tank 3 (the central axis position of the cylinder), a straight tube ultraviolet lamp 5 is suspended, and the ultraviolet lamp 5 is housed in a transparent tube 13. The ultraviolet lamp 5 and the transparent tube 13 are inserted through an insertion hole 17 provided in the lid 15 and suspended in the water treatment tank 3. The ultraviolet lamp 5 and the transparent tube 13 are collectively referred to as an ultraviolet lamp body 19 hereinafter.

  The ultraviolet lamp 5 has a spectrum distribution as shown in FIG. 8, and has a wavelength band (282, 302) of 282 nm or more in addition to a wavelength (185 nm, hereinafter referred to as ozone ray) for generating ozone and a wavelength called sterilization line (254 nm). 313, 365 nm) and purple (404,436 nm) visible light. In the present embodiment, ozone rays and sterilization rays are mainly used as photocatalyst ultraviolet rays. The ozone ray (185 nm) has a relative intensity of about 10% with respect to the germicidal line. In the wavelength band of 282 nm or more, the relative intensity is about 10% with respect to the germicidal line (254 nm).

  As shown in FIG. 2, the filter 7 has a cylindrical shape and has an insertion hole 21 for the ultraviolet lamp body 19 in the center. In this embodiment, the filter 7 has a height of about 150 mm and a thickness between the inner peripheral surface and the outer peripheral surface of about 15 mm. In the present embodiment, a plurality of filters 7 are arranged so as to overlap along the ultraviolet lamp 15, and the ultraviolet lamp body 19 is covered with the plurality of filters 7.

  The outer peripheral surface of the filter 7 is disposed close to the cylindrical inner surface of the water treatment tank 3, and most of the volume of the water treatment tank 3 is filled with the filter 7.

  Titanium oxide is carried on the base material 23 of the filter 7. In the present embodiment, the base material 23 is formed by foaming alumina. As shown in FIG. 2, a large number of water passage holes 25 are formed in a so-called sponge shape. Is surrounded by an alumina thin film material 27. The number of holes in the water passage hole 25 is 5/25 mm to 20/25 mm (the number of holes included in the straight line 25 mm, hereinafter, 5/25 mm is # 5, and 20/25 mm is # 20). preferable.

  An annular spacer 29 is interposed between the ultraviolet lamp body 19 and each filter 7 to maintain a constant gap between the ultraviolet lamp body 19 and the inner peripheral surface of the filter 7. A spacer 29 is pressure-bonded to the ultraviolet lamp body 19 to hold the filter 7 on the ultraviolet lamp body 19.

  An aeration unit 31 is provided at the lower part of the water treatment tank 3, and air (or ozone) is vented to the aeration unit 31 to aerate the water treatment tank 3. Further, ozone is generated in the water treatment tank by the ozone rays of the ultraviolet lamp body 19.

  It is desirable to supply an oxidizing agent into the treatment tank in addition to ozone aeration as necessary. As the oxidizing agent, hydrogen peroxide, chlorine dioxide, sodium hypochlorite, or the like is preferably used, but these oxidizing agents may be used alone or in combination with ozone. By using such an oxidizing agent in combination, it is possible to promote oxidative decomposition of the pollutant and promote purification of treated water. In addition, according to this Embodiment, since the oxidation, disinfection, and purification | cleaning action of titanium oxide and ozone are used together, the usage-amount of an oxidizing agent can be less than before.

  Next, the effect | action and effect of the water purification apparatus 1 concerning this Embodiment are demonstrated. The raw water introduced into the water treatment tank 3 from the introduction port 9 is sterilized by irradiation with the ultraviolet lamp 5. Furthermore, it passes through the filter 7 carrying titanium oxide and is sterilized and purified by the photocatalytic function of titanium oxide. Further, in the water treatment tank 3, the aeration is performed by the air introduced from the aeration unit 31, and the oxidation process is promoted and the remaining raw water is agitated.

  According to the present embodiment, since the ultraviolet lamp 5 is inserted into the filter 7 carrying titanium oxide, the ultraviolet lamp 5 and the titanium oxide are located close to each other, and the photoactivity of titanium oxide due to the irradiation of ultraviolet rays. Can be increased. In particular, as shown in FIG. 8, ozone rays (185 nm) and sterilization rays (254 nm), which are light wavelengths larger than the commonly used 365 nm ultraviolet light, are used. The water is purified by the photocatalytic function of titanium oxide. That is, since raw water is sterilized and purified by the photocatalytic function of titanium oxide in addition to ultraviolet rays, a high purification function can be obtained. In particular, the photocatalytic function of titanium oxide can be used to decompose ammonia and organic substances in the raw water.

  Since a large number of water passage holes 25 are formed in the filter 7 supporting titanium oxide, the contact area between the titanium oxide and the raw water can be increased.

  Since the filter 7 has a cylindrical shape and the ultraviolet lamp 15 is disposed at the center thereof, the titanium oxide carried by the filter 7 can be evenly irradiated with ultraviolet rays around the ultraviolet lamp 15. Further, the proximity irradiation of ultraviolet rays can be performed around the ultraviolet lamp 15. Moreover, since the thick filter 7 is interposed between the ultraviolet lamp 15 and the inner surface of the water treatment tank, the ultraviolet rays reaching the inner surface of the water treatment tank 3 are reduced, and the water treatment tank is deteriorated or damaged by the ultraviolet rays. Can be prevented.

  Since the filter 7 has water flow resistance, it is possible to prevent the raw water in the water treatment tank 3 from being short-circuited from the introduction port 9 to the discharge port 11, and the purification treatment efficiency is good.

  By aeration of air (or ozone), purification of raw water by oxidation is promoted in the water treatment tank 3, and deposits on the filter 7 are peeled off to prevent clogging of the filter 7.

  Since the filter 7 is manufactured by foaming, the filter 7 is light and easy to handle as a whole.

  The filter 7 is formed in a columnar shape having an insertion hole 21 at the center, and a plurality of the filters 7 are stacked in the longitudinal direction of the ultraviolet lamp 5. In other words, the filter is divided, so that it is easy to handle and the filter 7 is deteriorated. In the case where damage occurs, some of the filters 7 can be easily repaired or replaced.

  Since the spacer 29 is provided between the ultraviolet lamp body 19 and the filter 7, the distance between them can be kept uniform and the filter 7 can be easily positioned with respect to the ultraviolet lamp body 19. In addition, the spacer 29 can be pressed against the ultraviolet lamp body 19 and the filter 7 to fix both easily.

  Since the ultraviolet lamp body 19 and the filter 7 are united and suspended in the water treatment tank 3 so as to be freely inserted and removed, maintenance of the filter 7, the water treatment tank 3 and the ultraviolet lamp 15 is easy.

  Next, since various experiments were performed for confirming the effects of the present embodiment, the results will be described.

(Experimental example 1)
The filter according to the above-described embodiment formed in a flat plate shape (vertical 150 mm × width 150 mm × thickness 10 mm) is immersed in an aqueous ammonia solution, and the pH value of the aqueous ammonia solution is measured at each elapsed time. The PH value was measured in the same manner for a sample that was not immersed (blank). The aqueous ammonia solution was circulated with a circulation pump having a water discharge rate of 0.2 liter / min. The result is shown in FIG.

  As is clear from FIG. 4, in the filter according to the present embodiment, the PH value is remarkably lowered at every elapsed time as compared with the blank, so that it is excellent in the decomposition of ammonia by the photocatalytic function of titanium oxide supported on the filter. I understand that.

(Experimental example 2)
As in Experimental Example 1, a filter carrying titanium oxide is formed into a flat plate and immersed in water mixed with soy sauce (organic matter), and the soy sauce water is circulated as in Experimental Example 1, and the conductivity is measured at each elapsed time. did. Moreover, PH value was similarly measured about what does not immerse a filter (blank). The result is shown in FIG. As can be seen from FIG. 5, the conductivity of the filter soaked decreases with time and is excellent in the soy sauce (organic matter) decomposition function due to the photocatalytic function of titanium oxide.

(Experimental example 3)
The surface of the stainless steel plate coated with titanium oxide, with UV lamps placed close together (15 mm to 20 mm spacing), with a conventional spacing (150 mm to 200 mm spacing), and only UV lamps (blank) ) Was placed in a tank containing a methylene blue aqueous solution (test solution), the aqueous solution was circulated, and the permeability by decolorization of the methylene blue aqueous solution by photocatalytic action for each elapsed time was measured. The result is shown in FIG. The water discharge rate of the circulation pump was 0.2 liter / min. The same ultraviolet lamp as that in the above-described embodiment was used.

  As is apparent from the graph shown in FIG. 6, when the ultraviolet lamp is placed close to the titanium oxide support as in the present embodiment, the permeability of the methylene blue aqueous solution is significantly increased compared to the other. . That is, it is clear that when an ultraviolet lamp is placed close to the titanium oxide support, the photocatalytic function of titanium oxide is activated and the organic substance decomposition function is enhanced.

(Experimental example 4)
For the filter used in Experimental Example 1, the number of water passage holes is changed, # 6 and # 15 are formed in the same flat shape as in Experimental Example 1, and are placed in a tank containing a methylene blue aqueous solution to circulate the aqueous solution. The permeability of the aqueous methylene blue solution was measured for each elapsed time, and the results are shown in FIG. The other conditions were the same as in Experimental Example 3.

  As is clear from the graph shown in FIG. 7, the smaller the diameter of the water passage hole 25 (the larger the mesh value), the higher the permeability and the higher the function of decomposing organic matter with titanium oxide.

  In the following, other embodiments of the present invention will be described. In the following description, parts having the same functions and effects as those of the above-described embodiments will be denoted by the same reference numerals, and detailed description thereof will be given. In the following description, differences from the above-described embodiment will be mainly described.

  FIG. 9 shows a water purification apparatus 1 according to the second embodiment. In this water purification apparatus 1, the water treatment tank 3 has a rectangular parallelepiped shape, and a large number of integrally mounted ultraviolet lamps 5 and filers 7 are disposed in the tank 3 to treat a large amount of raw water. Is.

  Also in the second embodiment, the same effects as those of the first embodiment described above can be obtained.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, it is good also as a domestic water purification apparatus which reduced the water treatment tank 3 concerning 1st Embodiment. In this case, a water supply faucet is connected to the introduction port 9, and the ultraviolet ray lamp 5 is suspended in the water treatment tank 3 together with the filter 7 so that the filter 7 and the ultraviolet lamp 5 are simultaneously removed from the water treatment tank 3. It is preferable to have a configuration capable of being pulled out. This is because the filter 7 and the ultraviolet lamp 5 can be easily replaced and cleaned. The aeration unit 31 may not be provided.

  The raw water to be treated in the water treatment tank 3 may be groundwater, industrial water, sewage, or pure water for medical use.

  The filter 7 is not limited to a foam, but may have a water passage hole formed in a honeycomb shape, and its shape and manufacturing method are not limited. The filter 7 may be a knitted carbon fiber carrying titanium oxide.

  The filter 7 may be one in which silver, gold, or copper is added in addition to titanium oxide, or an adsorbent such as zeolite or apatite is mixed.

It is a longitudinal cross-sectional view of the water purification apparatus concerning 1st Embodiment of this invention. It is a perspective view of a filter. It is a cross-sectional view of the water purification apparatus shown in FIG. It is a graph of the photocatalyst function experiment of a filter, and is a graph which shows PH value for every elapsed time when ammonia water is made into test water. It is a graph of the photocatalytic function experiment of a filter, and is a graph which shows the electrical conductivity for every elapsed time when soy sauce water is made into test water. It is a graph which shows the change of a photocatalyst function when the space | interval of a filter and an ultraviolet lamp differs. It is a graph which shows the relationship between the fineness of a water flow hole, and a water purification function. It is a figure which shows the spectrum distribution of the ultraviolet lamp used for this Embodiment. It is a perspective view which shows schematic structure of the water purification apparatus concerning 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water purification apparatus 3 Water treatment tank 5 Ultraviolet lamp 7 Filter 9 Inlet 11 Outlet 19 Ultraviolet lamp body 21 Insertion hole 23 Base material 25 Water passage hole 29 Aeration part

Claims (7)

  A water treatment tank that retains the raw water introduced from the inlet and leads out from the outlet, an ultraviolet lamp that is disposed in the water treatment tank, and a filter that is formed in a cylindrical shape and passes through the ultraviolet lamp in the center. A water purification apparatus comprising: a filter, wherein a titanium oxide is supported on a base material, and a plurality of water passage holes are formed.   The water purification apparatus according to claim 1, wherein the base material of the filter is made of a foam.   2. The water purification apparatus according to claim 1, wherein a plurality of filters are arranged in the longitudinal direction of the ultraviolet lamp.   The water purification apparatus according to claim 1, wherein the ultraviolet lamp is housed in a transparent tube, and a spacer is disposed between the transparent tube of the ultraviolet lamp and the filter.   The water purification apparatus according to claim 1, wherein aeration is performed by supplying air or ozone into the water treatment tank.   The water purification apparatus according to claim 1, wherein the introduction port is a connection port to which a tap of a water supply is connected, and an ultraviolet lamp is suspended in the water treatment tank together with a filter.   The water purification apparatus according to claim 5, wherein an oxidizing agent is supplied into the water treatment tank.

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