JPH09253637A - Fluid treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid treatment apparatus not lowered in capacity even in the case of long-term use and developing stable purifying and sterilizing capacity regardless of a contamination state of a fluid. SOLUTION: A circulating means 19 and a catalytic reaction means 25 are arranged to a circulating passage 18 and an ultraviolet lamp 26 is arranged in the catalytic reaction means 25. The catalytic reaction means 25 is packed with granular titanium oxide 27 capable of coming into contact with the ultraviolet lamp and particles of granular titanium oxide 27 are stirred by the flow of circulating water to be allowed to collide with each other to purify and sterilize circulating water while peeling the substance deposited on the surfaces of the particles to always obtain stable purifying capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to purification or sterilization of a fluid such as water or air for business or household use.

[0002]

2. Description of the Related Art In a conventional fluid treatment apparatus, for example, in the case of purifying water, as shown in FIG. 3, a purifying and sterilizing cylinder having a photocatalyst and a light source is provided in a circulation passage to purify and purify water by a catalytic reaction. Some have been sterilized (for example, Japanese Patent Laid-Open No. Hei 7
-214053). In the figure, 1 is a bathtub,
The circulation flow path 4 is equipped with a circulation pump, a purification / sterilization cylinder 6, a three-way valve 7, and a two-way valve 8. An ultraviolet lamp 9, a photocatalyst 10 and a porous ceramic 11 are provided inside the purification / sterilization cylinder 6. Further, in order to clean the porous ceramic 11, a bypass flow path 13, a drainage path 14, a three-way valve 7, and a two-way valve 15 are provided. The control device 12 energizes the ultraviolet lamp 9. Further, 16 indicates a power source, and arrows indicate the flow of water.

The operation of this structure will be described. The circulation pump 5 works to suck the water in the bathtub 1 into the suction port 2.
Through the circulation channel 4 into the purifying / sterilizing cylinder 6. In the purification and sterilization cylinder 6, the photocatalyst 10 sterilizes the water and decomposes the odorous components by the ultraviolet rays emitted from the ultraviolet lamp 9. After that, the remaining organic substances are decomposed by the action of the microorganisms propagated on the porous ceramic 11 outside the photocatalyst 10. As a result, clean water is obtained.

[0004]

However, the conventional fluid treatment apparatus as described above has the following problems.

(1) When the purification of the fluid to be treated is continued, suspended substances in the fluid are deposited on the surface of the catalyst, and the effect of the redox reaction on the surface of the catalyst is reduced. As a result, the purification and sterilization performance is gradually increased. Will eventually decrease, and eventually the catalyst's purification and sterilization capacity will be lost.

(2) Since microorganisms are propagated and organic substances in water are decomposed by this action, changes in environmental factors such as ambient temperature changes, qualitative and quantitative changes in nutrient sources of microorganisms cause changes in microorganisms. Since the purification activity changes, stable purification performance cannot be obtained when the surrounding environment changes.

(3) Since the fluid to be processed is provided with an ultraviolet lamp, if the fluid is continuously processed for a long period of time, organic substances and the like will adhere and accumulate on the ultraviolet lamp, and the amount of ultraviolet light that can be irradiated from the ultraviolet lamp to the photocatalyst. Is reduced. Therefore, since the redox reaction in the photocatalyst is reduced, the purifying and sterilizing ability is lowered.

(4) When there are many suspended substances in the fluid to be treated and the UV transmittance is low, the amount of UV irradiation to the photocatalyst is reduced, so that the redox reaction is suppressed on the catalyst surface, and as a result, , Purification and sterilization performance will be reduced.

(5) By providing a photocatalyst in the vicinity of a microbial carrier for propagating microorganisms and irradiating it with ultraviolet rays to purify water, the apparatus becomes compact, and a synergistic effect with the decomposition effect of microorganisms on organic matter results in cleanliness. Although water is obtained, it takes a long time to decompose these substances, particularly when the concentration of organic substances in the water to be treated is high or when a hardly decomposable substance is present.

[0010]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by carrying means for carrying a fluid to be treated into a flow passage and catalytic reaction means filled with a catalyst for changing a substance in the fluid to be treated. And a stirring means for stirring the catalyst.

In the fluid processing apparatus having the above structure, the fluid is fed into the catalytic reaction means by the fluid carrying means and reacted with the catalyst stirred by the stirring means. In other words, by feeding the fluid into the catalyst reaction means and stirring the catalyst when reacting with the catalyst, the catalysts collide with each other and the organic substances adhering to the surface are peeled off. Can be maintained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluid processing apparatus according to claim 1 of the present invention is a catalytic reaction in which a transport means for transporting a fluid to be treated into a flow channel and a catalyst for changing a substance in the fluid to be treated are filled inside. Means and stirring means for stirring the catalyst are provided, and by feeding the fluid into the catalyst reaction means and stirring the catalyst when reacting with the catalyst, the catalysts are caused to collide with each other, and The attached organic matter can be peeled off, and purification and sterilization performance can be maintained for a long period of time.

According to a second aspect of the present invention, there is provided a fluid treatment device, which comprises a storage means for storing a fluid, a circulation means for joining a circulation passage to the storage means, and a circulation means for circulating the fluid to be treated in the circulation passage. The catalyst reaction means filled with a catalyst for changing the substance in the fluid to be treated and the stirring means for stirring the catalyst are provided, and the fluid in the storage means is circulated by the circulation means to determine the catalytic reaction means. By also passing through,
It is possible to improve the contact between the agitated catalyst inside and the substance in the fluid, and it is possible to improve the purification ability of the substance in the fluid or the sterilizing ability of bacteria.

According to a third aspect of the present invention, there is provided a catalyst outflow prevention means on the fluid inflow side and the fluid outflow side of the catalyst reaction means, and the outflow prevention means allows the fluid to pass through, but the catalyst does not Since the catalyst is retained in the catalytic reaction means, it is possible to prevent the catalyst from flowing out of the catalytic reaction means.

A fluid processing apparatus according to claim 4 of the invention is
The catalyst is in the form of particles, the contact time per unit time in the water to be treated can be increased, and by bringing the granular catalyst into contact with the fluid to be treated while stirring,
The entire surface of the catalyst can be used to efficiently react with the substance in the fluid to be treated.

The fluid treatment apparatus according to the fifth and sixth aspects of the present invention is configured such that an ultraviolet irradiation means is provided inside the catalytic reaction means, a granular photocatalyst is filled, and the granular photocatalyst is stirred by the stirring means. By stirring the photocatalyst with the stirring means and bringing it into contact with the fluid in the vicinity of the ultraviolet irradiation means,
The substance in the water to be treated can be decomposed while peeling off the substance adhering to the surface of the ultraviolet irradiation means. Therefore, stable purification performance can be obtained. Further, the irradiation amount of ultraviolet rays on the catalyst surface is increased, active oxygen such as hydroxy radicals and holes generated on the photocatalyst surface are effectively generated on the catalyst surface, and the redox reaction can be caused. That is, since the substance in the fluid can be effectively oxidized, the decomposition rate of the hardly decomposable organic substance in the fluid can be increased.

The fluid treatment apparatus according to claims 7 and 8 of the present invention has a structure in which a metal element is supported on the surface of the catalyst in the photocatalytic reaction means, and the reaction between the fluid to be treated and the photocatalyst is effectively performed. You can That is, by contacting the metal element carried on the photocatalyst and the fluid to be treated, the activation energy of the substance in the water to be treated can be lowered,
The energy required for redox of the substance in the fluid to be processed can be reduced. Therefore, the reaction rate with active oxygen species such as hydroxy radicals generated on the photocatalyst and holes can be improved. Furthermore, when the metal element begins to dissolve in the fluid in an ionic state, microbeads of the metal (oligodynamic action) can kill microorganisms such as bacteria in the fluid and improve sterilization performance. Purification and sterilization performance can be improved by these effects.

In the fluid treatment apparatus according to the ninth aspect of the present invention, the temperature adjusting means for heating the fluid to be treated and the catalyst is provided in the pipe, and the temperature of the fluid and the catalyst can be raised for purification. , Purification, sterilization speed can be improved. In other words, by increasing the temperature of the fluid to be treated and the catalyst by the heating means, heat energy is added to the substance in the fluid to be treated, and the amount of energy required for the catalyst to decompose the substance is lowered, so that it is faster than usual. It can decompose organic substances.

In the fluid treatment apparatus according to the tenth aspect of the present invention, the pipe or the circulation passage is provided with a filtering means for removing large particles in the fluid and removing the large particles in the catalytic reaction means on the downstream side. Since a fluid with a small amount can be sent in, it is possible to prevent clogging of the catalyst outflow prevention means in the catalyst reaction means.

A fluid treatment apparatus according to an eleventh aspect of the present invention has a configuration including a cleaning means for the filtering means,
When particles of organic matter are deposited on the surface of the filter medium and the gaps in the filter means due to long-term use, the cleaning means is operated to wash the filter medium in the filter means and discharge the organic matter deposited on the surface of the filter medium. Maintains the particle removal performance of the filtration means,
An increase in pressure loss can be suppressed.

The fluid treatment apparatus according to claim 12 of the present invention is provided with an aggregating means for aggregating the substance in the fluid in the upstream direction of the filtering means, and the particle diameter in the fluid is increased to remove it by the filtering means. By doing so, the ultraviolet transmittance of the fluid can be improved, and the amount of ultraviolet rays reaching the photocatalyst surface can be increased. Therefore, a redox reaction can be stably caused.

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a block diagram of a fluid processing apparatus in an embodiment of the present invention. The bath water after bathing was used as the fluid to be treated. In the figure, bathtub water is contained in the bathtub 17. A circulation flow path 18 is connected to the bathtub 17. The circulation flow path 18 is a circulation pump 19 that serves as a transfer or circulation means for circulating the bath water in the bath 17, and a filtration that removes large suspended substances in the bath water. The device 20, and the catalytic reaction means 25 and the heating means 29 are arranged downstream thereof. Inside the filtering means 20, a filter medium 21 and a filter medium support plate 22 for supporting the filter medium 21 are provided. Further, the filtering means 20 is provided with an aluminum electrode 23 and a stainless steel electrode 24 which serve as aggregating means in the upstream direction of the filtering material.
Is used as an anode, and the stainless steel electrode 24 is used as a cathode.

The catalytic reaction means 25 is provided with an outflow prevention plate 28 for preventing the outflow of the granular titanium oxide 27 of the photocatalyst on the inlet side and the outlet side of the fluid, and an ultraviolet lamp 26 serving as an ultraviolet irradiation means is provided near the center. ing. Further, three-way valves 30, 31 and two-way valve 33 and pipes 34, 35 for cleaning the filtering means 20 are provided. Electrode 23,
ON / OFF of 24 and ultraviolet lamp 26, heating device 29 serving as temperature adjusting means, three-way valves 30, 31 and two-way valve 33.
The control and opening / closing control are performed by the controller 36. The arrows indicate the flow of bath water.

The granular filter material 21 inside the filtering means 20 has a particle diameter of 0.
A porous ceramic having a specific gravity of 2 to 0.8 mm and a specific gravity of 3.5 or more is used. Further, in this embodiment, a porous plate made of polymethylmethacrylate is used for the filter medium support plate 22 and the outflow prevention plate 28. However, since it is desired that the plate has good corrosion resistance, water permeability, cleanability and high strength, In addition to methyl methacrylate, ABS, polyethylene, polypropylene, ceramics, etc. may be used. In the catalytic reaction means 25, the particle diameter is 0.2 to 0.8 and the specific gravity is about 2.0.
Anatase type titanium oxide having a crystal structure of was used.

In this embodiment, TiO ₂ is used as a photocatalyst.
Although SrTiO ₂ , ZnO, or the like may be used instead. Furthermore, although the granular photocatalyst of this embodiment is obtained by kneading and firing titanium oxide in silica-alumina ceramic, any photocatalyst may be present on the surface of the particles. It may be coated with a photocatalyst such as or a granular photocatalyst such as titanium oxide. Further, in order to agglomerate the organic matter in the bath water, electricity was conducted using an aluminum electrode as an anode, but any substance capable of producing a substance having an aggregating action may be used. Good.

In the above structure, the operation of this embodiment will be described next.
The operation will be described. The bath water in the bath 17 passes through the flow path 18 by the action of the circulation pump 19 and the filtering means 20.
And then enters the catalytic reaction means 25. In the catalytic reaction means 25, the particulate titanium oxide 27 receives the ultraviolet light excited by the ultraviolet lamp 26. The granular titanium oxide 27 is agitated in the catalytic reaction means 25 by the flow of bath water.
In the vicinity of the surface of the granular titanium oxide 27, active oxygen such as hydroxy radicals formed by the reaction with water and holes caused by receiving ultraviolet rays can be present. Further, due to bathing, keratin, sebum, bacteria and the like exfoliated from the human body are mixed in the bath water in the bath 17. Due to this mixed keratin, the turbidity of bath water increases. The average particle size of the keratin mixed by the bath is around 30 μm, and particles of this size can be removed by the granular filter material 21 in the filtering means 20.

However, when bacteria in the bath water grow by utilizing keratin and sebum, an odor is generated in the bath water, and the grown bacteria cause turbidity. Therefore, active oxygen such as hydroxy radicals generated on the surface of the photocatalyst 27 in the catalytic reaction means 25 and holes on the surface of the granular titanium oxide 27 and odorous components and bacteria cause an oxidation-reduction reaction to oxidatively decompose the odorous components, resulting in turbidity. By sterilizing and decomposing the underlying bacteria, the increase in odor and turbidity of bath water is suppressed. Therefore,
It is possible to suppress an increase in odor and turbidity of bath water. However, when the granular titanium oxide 27 in the catalytic reaction means 25 has no fluidity, if water having a high organic matter content is purified for a long period of time, it will bond with metal elements such as calcium dissolved in keratin and sebum present in water. The resulting scales and bacteria deposit on the surface of titanium oxide, and as a result, the catalytic activity is gradually lost, and eventually most of the catalyst is covered with these substances and loses the activity.

However, when water is purified by the structure of this embodiment, the granular titanium oxide 26 is agitated in the catalytic reaction means 25, so that the granular titanium oxides 27 repeatedly rotate and collide with each other. Accumulated keratin, scale and bacteria are exfoliated. Therefore, the entire surface of the titanium oxide 27 can always receive ultraviolet rays and can cause an oxidation-reduction reaction, so that the odorous components and bacteria of the bath water in the bath 17 can be decomposed and the growth of bacteria can be suppressed. . Further, in this embodiment, since the silica-alumina ceramic in which titanium oxide is kneaded is fired to be formed into particles, the titanium oxide coating layer is not peeled off due to collision between particles. Rather, by adjusting the calcination temperature, etc. to soften the strength of the particles, it is possible to expose the surface without deposits by scraping a small amount for a long time, so that the purification and sterilization performance of the photocatalyst should be maintained. You can

By providing the circulation means 19 and the catalytic reaction means 25 in the circulation passage 18, the bath water in the bath 17 can circulate in the catalytic reaction means 25 and the bath 17. Therefore, the odorous components and bacteria in the bath water pass through the catalytic reaction means 25 many times, and the ultraviolet rays are irradiated by the ultraviolet lamp 26 in the catalytic reaction means 25,
It is possible to increase the number of times of contact with active oxygen species such as hydroxyl radicals generated by the catalytic reaction with water and the holes generated on the catalyst 27 by irradiation of ultraviolet rays. Therefore, the decomposition and sterilization efficiency of odorous components and bacteria in the bath water can be improved.

Further, when the granular titanium oxide 27 is filled in the catalytic reaction means 25 and the bath water is purified while stirring, the stirring speed is set to prevent the granular titanium oxide 27 from flowing out of the catalytic reaction means 25. Limited, granular titanium oxide 2
The contact time with 7 becomes shorter. Therefore, in order to obtain sufficient decomposition and sterilization ability, it is necessary to increase the volume of the catalytic reaction means 25.

On the other hand, when the stirring speed is increased, the granular titanium oxide 27 leaks into the circulation passage 18 into the catalytic reaction means 25 of the granular titanium oxide 27, and the valves 30, 31, 33 and the circulation pump 19 are clogged, causing malfunction or malfunction. Cause of. Therefore, by providing the outflow prevention plate 28 for preventing the outflow of the granular titanium oxide 27, even when the circulating flow rate of the bath water is increased,
It is possible to prevent the granular titanium oxide 27 from flowing out to the circulation flow path 18 and the bath 17 due to the rolling up of the catalyst 27. Therefore, it is possible to prevent the circulation pump 19 and the valves 30, 31, 33 from being clogged and broken by the granular titanium oxide 27 leaking into the pipe. Furthermore, since the circulation flow rate can be increased without having to worry about the outflow of the granular titanium oxide 27 due to the increase in the flow velocity, active oxygen species such as hydroxy radicals and granular particles generated in the vicinity of the granular titanium oxide 27 in the catalytic reaction means 25 and the granular particles. It is possible to improve the contact efficiency per unit time between the holes formed on the surface of titanium oxide 27 and the odorous components and bacteria in the bath water. Therefore, the odorous components in the bath water and the bacteria can be effectively decomposed and sterilized, and the catalytic reaction means 25 can be downsized.

It should be noted that, in this embodiment, as a washout prevention plate,
Although a porous plate having an opening diameter of about 1 mm is used, one having an opening diameter smaller than the particle diameter of the granular titanium oxide 27 may be selected, and considering the pressure loss, about 1 / of the particle diameter is used.
A hole diameter of 2 is used. In addition, the outflow prevention plate 2
Since it is necessary to select the material of No. 8 whose surface has good corrosion resistance, water permeability, cleanability and high strength, a porous plate made of polymethylmethacrylate which is a polymer resin is used in this embodiment.

Further, since the granular titanium oxide 27 in the catalytic reaction means 25 has a granular shape, the surface area per unit volume can be maximized. Therefore, the contact area with the bath water sent by the circulation pump 19 becomes large, and the surface area of the granular titanium oxide 27 becomes large, the area receiving the ultraviolet rays generated by the ultraviolet lamp 26 also becomes large. Can generate a lot of oxygen and holes. Therefore, the contact of these substances with the odorous substances and bacteria in the bath water increases, and the decomposition and sterilization performance of the odorous components and bacteria in the bath water per unit time can be improved. It should be noted that the granular titanium oxide 27 is subjected to ultraviolet rays while being agitated and brought into contact with the bath water, so that the entire surface of the granular titanium oxide 27 is used for purification and sterilization. Sterilization can be performed.

As the water in the bath 17, tap water is used in many cases. In recent years, it has been suggested that halogen compounds such as trihalomethane existing in tap water may be harmful. This trihalomethane is difficult to decompose, it is difficult to decompose by microbial treatment, but if the photocatalyst is used,
It can be decomposed to some extent. However, when the amount of chlorine added to tap water in the summer is high, the amount of halogen compounds such as trihalomethane is naturally large. In order to purify using the photocatalyst under such conditions, it is necessary to increase the surface area of the photocatalyst. Therefore, by filling the granular titanium oxide 27 in the catalytic reaction means 25 and stirring by the flow of circulating water, it is possible to receive the ultraviolet rays generated by the ultraviolet lamp 26 on the entire surface of the granular titanium oxide 27. That is, the entire surface of the granular titanium oxide 27 can be utilized to form holes with active oxygen species such as hydroxy radicals.

In general, it is said that the decomposition of a hardly decomposable organic substance such as a halogen compound by a photocatalyst such as titanium oxide is carried out by active oxygen or holes generated by the photocatalytic reaction. Therefore, by irradiating the granular titanium oxide 27 with ultraviolet rays in the vicinity of the ultraviolet lamp 26, the amount of ultraviolet rays irradiated on the granular titanium oxide 27 can be increased,
As a result, a large amount of active oxygen species can be generated, so that the decomposition rate of the halogen compound in water can be increased. In addition, as in this embodiment, the catalytic reaction means 2 is used in the circulation system.
By repeatedly circulating the bath water in 5, it is possible to further improve the decomposition efficiency of the hardly decomposable organic compound. If you carry out purification and sterilization operation for a long period of time, minute horny substances in the bath water and organic substances such as scales and bacteria will adhere, so the UV lamp 2
The amount of ultraviolet rays irradiated from No. 6 is significantly reduced, and the purification performance is reduced. However, by disposing the ultraviolet lamp 26 in the center of the catalytic reaction means 25, filling the granular titanium oxide 27, and stirring the titanium oxide 27 to collide with the surface of the ultraviolet lamp 26, the surface of the ultraviolet lamp 26 is It is possible to peel off the adhered minute keratin and organic substances such as bacteria. Therefore, the purifying and sterilizing ability of the catalytic reaction means 25 can be maintained.

Further, when the concentration of odorous components and organic substances such as bacteria in the bath water is high, it takes time to purify and sterilize the water quality to the target level even if purification is performed using normal titanium oxide. Therefore, as shown in FIG. 2, silver 36 and copper 3 are formed on the surface.
By purifying the bath water by using the granular titanium oxide 27 carrying No. 7, the purification performance of the bath water can be improved. In other words, the catalytic action of copper and silver supported on the granular titanium oxide 27 can reduce the activation energy of the odorous substances in the bath water and the cell membrane of bacteria, so that the energy required to decompose these substances can be reduced. Can be made smaller. The reaction rate can be improved by reacting these odorous substances and bacteria with reduced activation energy with active oxygen species such as hydroxy radicals generated by photocatalytic reaction and holes. Therefore, the decomposition reaction rate can be increased, and the amount of odorous components, organic substances such as bacteria, decomposed and sterilized per unit time can be increased. Furthermore, a small amount of silver 36 and copper 37 carried on the granular titanium oxide 27 is eluted, and the sterilizing effect can be improved by the oligodynamic action (trace metal action). From the above, the purification and sterilizing ability of bath water can be improved.

Further, by providing the heating device 29 in the circulation passage 18 and heating the bath water, it is possible to raise the temperature of the bath water and the granular titanium oxide 27, and the granular titanium oxide 27.
By increasing the temperature of the atmosphere, the photocatalytic reaction rate can be increased, and the purification and sterilization performance can be improved. That is, heat energy can be applied to the odorous components in the bath water and the constituent substances of the bacteria to reduce the energy required to decompose the active oxygen species such as hydroxy radicals generated on the surface of the granular titanium oxide 27 and the substance of the holes. Therefore,
The rate of redox reaction can be increased, the decomposition rate of organic substances such as odorous components, and the sterilization rate of bacteria can be increased.

In general, bacteria have an optimum growth temperature range, and it is said that if the temperature is higher than this temperature, the growth ability will be sharply reduced. Therefore, the temperature of the bath water is increased by the heating device 29, so that the growth rate of the bacteria in the bath water can be reduced. Such bacteria enter the catalytic reaction means 25, and the granular titanium oxide 27 and the photocatalyst for the ultraviolet rays. The sterilization performance can be improved by contacting with active oxygen such as hydroxy radicals generated by the reaction or holes.
Needless to say, the purification and sterilization performance is further improved by using the photocatalyst supporting the metal element on the surface as described above.

Next, when the water purification operation is continuously continued,
Clogging occurs due to keratin and scales mixed with the bath in the wash-out prevention plate 28 in the catalytic reaction means 25, and lumps of grown bacteria. As a result, the pressure loss in the outflow prevention plate 28 portion increases and the circulation flow rate decreases, so that the amount of water to be treated that can be treated decreases. Therefore, the flow path 18 is provided with the filtering means 20 and the inside thereof is filled with the granular filter medium 21 so that keratin and lumps of bacteria in the bath water can be removed by the gaps between the granular filter mediums 21. That is, clogging can be reduced by filtering and removing suspensions such as keratin and lumps of bacteria in the bath water to reduce the adhesion of suspended substances to the wash-out prevention plate 28. In the present embodiment, in order to remove keratin and lumps of bacteria in the bath water, the filtering means 20 is filled with the granular filter material 21, but a substance that clogs the pores of the outflow prevention plate 28 is used. As long as it can be removed, a membrane, a wound filter, or the like may be used.

However, if the bath water is continuously purified for a long time,
On the granular filter material 21 in the filtering means 20, horny cells, scales of bacteria, lumps of bacteria and the like in the bath water gradually accumulate, closing the gaps between the granular filter materials 21 and, as a result, increasing the pressure loss.
The processing capacity per hour is reduced. Therefore, the control device 3
By the function of 6, the three-way valve 30 and the three-way valve 3 are provided so that bath water flows from the direction of the filter medium support plate 22 of the filtering means 20.
1 is switched, the two-way valve 33 is opened, and the bath water is discharged from the drain pipe 34 to levitate suspended matter such as horny cells and bacterial clumps that block the gaps between the granular filter medium 21 and the filter medium 21, Discharge from the drain pipe 34. When the suspended substance that has blocked the gap of the granular filter medium 21 can be discharged, the two-way valve 33 is closed and the three-way valves 30 and 31 are switched to return to the normal circulation circuit. By this operation, an increase in the pressure loss of the filtering means 20 can be suppressed, and a constant processing flow rate can always be obtained.

Further, when the size of the gap between the granular filter media 21 is smaller than the suspended matter of minute horny cells, scales of water, or bacterial mass in the bath water, the outflow prevention plate 28 is less likely to be clogged. Since the transparency of the bath water does not decrease, the transmittance of ultraviolet rays in the catalytic reaction means 25 decreases, and as a result, the purification / sterilization ability decreases. Therefore, purification and sterilization performance can be maintained by allowing the filtering means 20 to remove the minute suspended matter in water by coagulation. That is, the aluminum electrode 23 and the stainless steel electrode 2 are provided inside the filtering means 20.
4 is provided and electricity is applied using the aluminum electrode 23 as an anode to elute aluminum in bath water. In the bath water, aluminum becomes a hydrated aluminum hydroxide, agglomerates minute dust and bacteria in the bath water, forms a lump, increases the particle size, and removes it with the granular filter medium 21 in the downstream direction. in this way,
By removing minute dirt and bacteria, the ultraviolet transmittance of the bath water is improved, so that the reaction at the photocatalyst 27 in the catalytic reaction means 25 can be effectively performed.

[0042]

As described above, according to the fluid treatment apparatus of the present invention, the following effects can be obtained.

(1) Since the fluid to be treated is sent to the flow path by the fluid conveying means and the catalyst in the catalytic reaction means is agitated by the flow of the fluid, the catalysts collide with each other and are suspended on the surface of the catalyst itself. Since the suspended substance can be removed, the ability of the redox reaction on the catalyst can be maintained at all times. Therefore,
Purification and sterilization performance can be maintained for a long time.

(2) An organic substance in the fluid to be treated is provided by providing a circulation means in the circulation passage to circulate the fluid to be treated in the storage means to feed it to the catalytic reaction means and bring it into contact with the catalyst in the catalytic reaction means. Also, since the efficiency of contact with bacteria can be improved, the concentration of organic substances in the water to be treated can be reduced and the sterilization ability can be improved. Therefore, the fluid purification and sterilization performance can be improved.

(3) The catalyst can be prevented from flowing into the flow path by mounting the flow-out preventing means for preventing the catalyst from flowing out in the flow-out direction of the fluid to be treated of the catalyst reaction means, and the fluid can be conveyed in the flow path. It is possible to prevent failure of the means and the flow path switching means. Moreover, since the circulation speed of the fluid to be treated can be increased without worrying about the outflow of the photocatalyst from the catalytic reaction means, the treatment amount per unit time can be increased. Therefore, the purification ability of the fluid to be treated can be improved.

(4) By making the catalyst in the catalytic reaction means granular, the contact area of the fluid to be treated can be increased, and by bringing the catalyst into contact with the fluid to be treated while stirring by the stirring means, the catalyst surface Since the whole and the fluid to be treated can be brought into contact with each other, decomposition and sterilization performance per unit time can be improved.

(5) Purification of the fluid to be treated by colliding the granular photocatalyst with the ultraviolet irradiation device by filling the catalyst reaction means with the granular photocatalyst and agitating the photocatalyst with the ultraviolet irradiation device and stirring means. By performing the sterilization, the substance deposited on the surface of the ultraviolet irradiation device can be peeled off, so that the amount of ultraviolet rays applied to the photocatalyst can always be kept constant. Therefore, stable purification and sterilization performance can be maintained.

(6) By supporting a metal catalyst which improves the reaction rate of the photocatalyst on the surface of the photocatalyst, the reaction rate of the redox reaction on the photocatalyst can be increased. Therefore,
The purification rate can be improved, and the sterilizing ability can be enhanced by the synergistic effect with the oligodynamic effect of the metal eluted in a trace amount.

(7) Since the reaction rate of the catalyst can be increased by providing temperature control means in the flow path and raising the temperature of the fluid to be treated and the granular photocatalyst, the rate of redox reaction on the photocatalyst can be increased. Can be raised. Therefore, the rate of purification and sterilization by the catalytic reaction means can be increased.

(8) Large particles in the fluid to be treated can be removed by providing the flow path with the filtering means. Therefore, particles that block the pores of the outflow prevention means can be removed from the fluid to be processed, and the pressure loss can be prevented from increasing due to the blockage, so that a certain amount of fluid to be processed can be always processed. Therefore, stable purification and sterilization performance can be obtained for a long period of time.

(9) A washing means for washing the filtering means is provided in the flow path, and when the filter medium of the filtering means and the filter medium support plate are clogged, the washing medium is floated by the washing means to suspend the suspended substance. It is possible to prevent clogging of the pores of the outflow prevention plate in the catalytic reaction means by peeling off the suspended substances that have adhered to the substrate and resuspending them in water and discharging them. Therefore, stable purification and sterilization performance can be maintained for a long period of time.

(10) A filtering means is provided in the flow path, and an aluminum electrode and a stainless cathode serving as an aggregating means are provided in the filtering means to energize so that aluminum serves as an anode. By aggregating a minute suspended substance such as, for example, and removing it with a filtering means, the ultraviolet transmittance of the water to be treated can be improved, and the redox reaction on the photocatalyst can be efficiently performed. Therefore, stable purification and sterilization performance can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a fluid treatment device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing another example of the photocatalyst used in the fluid treatment apparatus of the present invention.

FIG. 3 is a configuration diagram of a conventional fluid treatment device.

[Explanation of symbols]

 18 Circulation Flow Path 19 Circulation Means (Circulation Pump) 20 Filtration Means (Aggregator) 23, 24 Aggregation Means (Electrode) 25 Catalytic Reaction Means 26 Ultraviolet Irradiation Means (Ultraviolet Lamp) 27 Granular Titanium Oxide 28 Outflow Prevention Means (Outflow Prevention Plate) ) 29 temperature control means (heating device) 36 silver 37 copper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Furuta 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A flow passage, a conveying means provided in the flow passage for conveying a fluid to be treated, a catalytic reaction means filled with a catalyst for purifying a substance in the fluid to be treated, and the catalytic reaction. A fluid treatment device having stirring means for stirring the catalyst in the means. 2. A storage means for storing a fluid to be processed, a circulation means for circulating a fluid in the storage means, a circulation flow path arranged between the storage means and the circulation means, and a circulation flow path. A fluid treatment apparatus comprising a catalytic reaction means filled with a catalyst for purifying substances in a fluid to be treated, and a stirring means for stirring the catalyst in the catalytic reaction means. 3. The fluid treatment apparatus according to claim 1, further comprising outflow prevention means for preventing the outflow of the catalyst on the inflow side and the outflow side of the fluid to be treated in the catalytic reaction means. 4. The fluid processing apparatus according to claim 1, wherein the catalyst reaction means is filled with a granular catalyst. 5. The fluid treatment apparatus according to claim 1, wherein the catalytic reaction means is provided with an ultraviolet irradiation means, and a granular photocatalyst is used as the catalyst. 6. The fluid treatment apparatus according to claim 5, wherein the granular photocatalyst is titanium oxide having anatase type crystal structure. 7. The fluid treatment apparatus according to claim 5, wherein the photocatalyst and at least one metal element are supported. 8. The fluid processing apparatus according to claim 7, wherein the metal elements are copper and silver. 9. The fluid processing apparatus according to claim 1, wherein the flow path is provided with temperature control means for the fluid to be processed. 10. The fluid treatment device according to claim 1, wherein the circulation passage has a filtering means. 11. The fluid treatment apparatus according to claim 9, further comprising a cleaning unit that cleans the filtering unit. 12. The fluid treatment apparatus according to claim 9, further comprising an aggregating unit provided upstream of the filtering unit.