JP3986502B2 - Air purification system - Google Patents

Description

  The present invention relates to an air treatment system for treating pollutants contained in air.

Recently, in order to relieve sick house syndrome and the like, indoor air purification has been attracting attention. In particular, formaldehyde has been pointed out as a strong irritant and an inducer of sick house, but since it is generated from building materials, paints, furniture, etc., there is a problem that the concentration in the indoor becomes high. As a method of removing malodorous substances such as volatile organic compounds (VOC) such as formaldehyde and ammonia, there is a system in which air containing these pollutants is dissolved by contacting with water and removed from the air. .
JP 2000-79157 A

  However, in a system that cleans air by dissolving contaminants contained in the air as described above, water used for air cleaning is treated as waste water. Therefore, the water used for air cleaning must always be supplied with new water, and there is a problem that forced water supply work is required.

  Accordingly, the present invention has been made to solve the conventional technical problems, and an object thereof is to provide an air cleaning system that can simplify complicated maintenance work and improve the effect of removing contaminants. And

  Another object of the present invention is to make it possible to use the air cleaning system as a decoration in addition to the above.

The air cleaning system according to the first aspect of the present invention treats pollutants contained in the air, adsorbs and collects the pollutants contained in the air, and releases and regenerates them. A possible contaminant adsorbing device, a see-through water tank for storing an aqueous solution, and at least a pair of electrodes for electrolysis at least partially immersed in the aqueous solution in the water tank, and treating the aqueous solution by electrolysis The air containing the pollutant released from the pollutant adsorbing device is discharged into the aqueous solution in the water tank, bounced at the upper part of the aqueous solution, and discharged from the exhaust port together with the splashed droplets .

  In the air cleaning system according to the second aspect of the present invention, the pollutant adsorbing device is configured such that the adsorbing portion through which air containing the pollutant is circulated and the regeneration portion that is heated to release the pollutant are configured. It is characterized by comprising a rotary adsorption member.

An air cleaning system according to a third aspect of the invention treats pollutants contained in the air, and at least a part thereof is immersed in the see-through water tank for storing the aqueous solution and the aqueous solution in the water tank. It includes at least a pair of electrodes for electrolysis, treats the aqueous solution by electrolysis, discharges air containing pollutants into the aqueous solution in the water tank, causes it to repel at the top of the aqueous solution, and discharges it from the exhaust port with the splashed splashes To do .

  The air purifying system of the invention of claim 4 is characterized in that a photocatalyst is provided in the aqueous solution in the water tank and irradiates visible light or ultraviolet light.

  In the air cleaning system according to the invention of claim 5, the electroconductive material constituting the electrode for electrolysis in each of the above inventions is hypochlorous acid, ozone, oxygen, hydrogen peroxide, hydrogen peroxide radical, superoxide. It is characterized by being an insoluble metal material capable of generating radicals, hydroxy radicals, singlet oxygen radicals, or carbon.

  The air purification system of the invention of claim 6 is characterized in that, in each of the above inventions, the aqueous solution contains 5 mg / L or more of halide ions.

  The air purification system of the invention of claim 7 is characterized in that in each of the above inventions, the polarity of the electrode for electrolysis is switched.

  An air cleaning system according to an eighth aspect of the present invention is characterized in that in each of the above inventions, air containing a pollutant in an aqueous solution is supplied in an amount of 0.01 L / min or more.

  The air cleaning system of the invention of claim 9 is characterized in that, in each of the above inventions, the pH of the aqueous solution is in the range of pH 4 to pH 8.

According to the first aspect of the present invention, in an air cleaning system for treating pollutants contained in the air, the pollutants that can adsorb, collect, release, and regenerate the pollutants contained in the air. An adsorption device, a see-through water tank for storing an aqueous solution, and at least a pair of electrodes for electrolysis at least partially immersed in the aqueous solution in the water tank are used to treat the aqueous solution by electrolysis and adsorb contaminants. The air containing the pollutant released from the device was discharged into the aqueous solution in the aquarium, bounced at the top of the aqueous solution, and discharged from the exhaust port along with the splashed droplets . contaminants is collected, after melted into solution in the water tank, hypochlorite produced by electrolysis and electrolysis directly on the electrode (hereinafter referred to as electrolytic hypochlorite) or ozone, Hydrogen oxidation, hydrogen peroxide radicals, superoxide radicals, hydroxyl radicals, will be decomposed by singlet oxygen radicals.

Thereby, the contaminant contained in the air can be efficiently removed. In particular, since the water tank can be seen through, it is possible to visually express how the discharged air rises as bubbles. Thereby, an air purifying system can be utilized now as decorations, such as interior. In addition, air containing contaminants in the aqueous solution is bubbled, and the air that has passed through the aqueous solution is bounced at the top of the aqueous solution and discharged from the exhaust port along with the splashed droplets, so hypochlorous acid contained in the splashed splashes Also, ozone and the like can decompose and sterilize pollutants contained in the surrounding air. Furthermore, since the pollutants dissolved in the aqueous solution are decomposed, the purified aqueous solution can always be used for air cleaning, and the maintenance can be improved by avoiding frequent replacement of the aqueous solution. It will be.

  According to a second aspect of the present invention, in the above pollutant adsorbing device, the rotary adsorbing device in which the adsorbing section through which air containing the pollutant is circulated and the regenerating section that is heated to release the pollutant is continuously formed Since it is composed of members, it is possible to permanently exhibit the function of adsorbing and releasing pollutants without exchanging the pollutant adsorbing device, thereby further improving maintainability.

According to a third aspect of the present invention, in an air cleaning system for treating pollutants contained in the air, a see-through water tank for storing an aqueous solution and at least a pair of electrolysis at least partially immersed in the aqueous solution in the water tank Electrodes for processing the aqueous solution by electrolysis, discharging air containing pollutants into the aqueous solution in the water tank, letting it bounce at the top of the aqueous solution, and discharging it from the exhaust port with the splashed splashes Therefore, after pollutants in the air are dissolved in the aqueous solution in the water tank, hypochlorous acid (hereinafter referred to as electrolytic hypochlorous acid) generated by direct electrolysis and electrolysis on the electrode, ozone, hydrogen peroxide, It is decomposed by hydrogen peroxide radicals, superoxide radicals, hydroxy radicals, and singlet oxygen radicals.

Thereby, the contaminant contained in the air can be removed smoothly. In particular, since the water tank can be seen through, it is possible to visually express how the discharged air rises as bubbles. Thereby, an air purifying system can be utilized now as decorations, such as interior. Furthermore, air that has passed through the aqueous solution is bounced at the top of the aqueous solution and discharged from the exhaust port along with the splashed droplets, so the pollutants contained in the surrounding air are also decomposed by hypochlorous acid contained in the splashed splashes. As well as being treated, sterilization will also take place. Furthermore, since the contaminants dissolved in the aqueous solution are decomposed, the purified aqueous solution can always be used for air cleaning, and frequent maintenance of the aqueous solution can be avoided and maintenance can be improved. It will be like that.

  In the invention of claim 4, in the above, the photocatalyst is provided in the aqueous solution in the water tank so as to irradiate visible light or ultraviolet light. Therefore, even in the aqueous solution by the oxidation reaction by the photocatalyst irradiated with visible light or ultraviolet light. It becomes possible to decompose and remove the pollutants dissolved in the water. In particular, if the ultraviolet light is irradiated with a purple light emitting lamp or LED, the visual effect can be further improved.

  In the invention of claim 5, the electroconductive material constituting the electrode for electrolysis in each of the above inventions is hypochlorous acid, ozone, oxygen, hydrogen peroxide, hydrogen peroxide radical, superoxide radical, hydroxy radical. Since it is an insoluble metal material or carbon that can generate singlet oxygen radicals, it is possible to efficiently decompose the contaminants dissolved in the aqueous solution.

  In the invention of claim 6, in each of the above inventions, the aqueous solution contains 5 mg / L or more halide ions, and therefore, active oxygen such as hypochlorous acid and ozone can be effectively generated in the aqueous solution by electrolysis. The components dissolved in the aqueous solution can be efficiently decomposed.

  In addition, active oxygen such as hypochlorous acid and ozone produced by electrolysis can kill bacteria in the aqueous solution, so it is possible to avoid the occurrence of off-flavors in the aqueous solution. can do. For this reason, the aqueous solution to be cleaned by contacting with air can be kept hygienic, and the indoor environment can be improved.

  In the invention of claim 7, since the polarity of the electrode for electrolysis is switched in each of the above-mentioned inventions, it is possible to prevent adhesion of substances such as chalk generated on the electrode for electrolysis which becomes a cathode in electrolysis, and to reduce the current-carrying efficiency of the electrode. It will be possible to avoid it. As a result, it is possible to avoid inconvenience that the electrolytic efficiency is lowered.

  In the invention of claim 8, since the air containing the pollutant in the aqueous solution in each of the above inventions is supplied in an amount of 0.01 L / min or more, the pollutant dissolved in the aqueous solution can be treated most efficiently. It becomes like this.

  In the ninth aspect of the present invention, since the pH of the aqueous solution is in the range of pH 4 to pH 8 in each of the above-described inventions, it is possible to perform the decomposition treatment of the contaminants with hypochlorous acid most efficiently.

  Hereinafter, the air purification system of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of an air cleaning system 1 according to an embodiment of the present invention, and FIG. The air cleaning system 1 of this embodiment has dimensions that can be installed indoors, such as a house, for example, and has a base 2 and a cylindrical shape (or a rectangular tube shape) that is erected on the base 2 and that can be seen through, for example. Water tank 3 made of transparent glass, acrylic resin, vinyl chloride resin, polycarbonate, or translucent glass (opaque), at least a pair of electrodes 4 and 6 for electrolysis provided at the bottom of water tank 3, and base 2 It is comprised from the contaminant adsorption | suction apparatus 7 etc. which are arrange | positioned in the inside. Reference numeral 5 denotes a suction cup attached to the bottom corners of the base 2.

  The upper surface of the water tank 3 is closed, and a plurality of exhaust ports 8 that communicate the inside of the water tank 3 with the outside are formed around the side surface of the upper end portion of the water tank 3 below the water tank 3. A predetermined amount of an aqueous solution containing, for example, 5 mg / L or more, 200 mg / L halide ions in the embodiment, and chloride ions in the embodiment is stored in the water tank 3. A ring-shaped air diffuser tube 9 having a plurality of air discharge narrow ports is disposed in the aqueous solution around the bottom of the water tank 3. Electrodes 4 and 6 are immersed in an aqueous solution.

  Both the electrodes 4 and 6 for electrolysis are made of, for example, an insoluble metal electrode such as platinum-iridium (Pt—Ir), and the mutual distance is, for example, 6 mm. In the present invention, the electrode for electrolysis refers to an electrode that is immersed in an aqueous solution as electrolyzed water and contributes directly to electrolysis, and includes a part of the electrode that is directly immersed and contributes directly to electrolysis. Shall be. In the present embodiment, the electrolysis electrodes 4 and 6 are constituted by a pair of electrodes, but in addition to this, a plurality of electrolysis electrodes may be provided.

  The contaminant adsorbing device 7 actively takes indoor air through a disk-shaped adsorbing member 11 rotated at a predetermined speed and an adsorbing portion (indicated by 11A) of the adsorbing member 11 through an air flow path. An air intake fan 12 to be ventilated and circulated, an electric heater 13 for heating a regeneration portion (shown by 11B) of the adsorption member 11 to + 60 ° C. to + 120 ° C., and air heated by the electric heater 13 Is constituted by a circulation path 14 for circulating the air through the regeneration section, a circulation fan 16 provided in the circulation path 14, a throttle section 17 provided in the circulation path 14 and the like. .

  The adsorbing member 11 is made of a pollutant adsorbent such as VOC adsorbing zeolite (for example, Hisiv6000 (trade name) manufactured by Union Showa Co., Ltd.), and circulates in a partially formed adsorbing portion (11A). It absorbs and collects pollutants contained in the indoor air.

  Here, pollutants in the air to be removed by the present invention include volatile organic compounds (VOC) and malodorous substances. Examples of volatile organic compounds include formaldehyde, toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, chloropyrifos, di-n-butyl phthalate, tetradecane, diazinon, and acetaldehyde. Examples of malodorous substances include , Ammonia, methyl mercaptan, hydrogen sulfide, methyl sulfide, methyl disulfide, trimethylamine, acetaldehyde, propionaldehyde, normal butyraldehyde, isobutyraldehyde, normal valeraldehyde, isovaleraldehyde, isobutanol, ethyl acetate, methyl isobutyl ketone, toluene, Examples thereof include styrene, xylene, propionic acid, normal butyric acid, normal valeric acid, isovaleric acid and the like. In the following examples, formaldehyde (HCHO) will be described as an example.

  The adsorbing member 11 is rotated at a predetermined speed in the direction of the arrow in FIG. In this regenerating part (11B), the air heated by the electric heater 13 is circulated in the circulation path 14 and is efficiently heated to a high temperature, and the part that has reached the regenerating part (11B) by this high temperature air is Heated to the aforementioned temperature. When the adsorption member 11 is heated, the adsorbed contaminant is released. The released pollutant rides on the high-temperature air and travels toward the throttle portion 17 in the circulation path 14. Note that the contaminant adsorbing action of the adsorption member 11 is regenerated by releasing the contaminant in the regeneration unit. This is continuously performed with rotation.

  On the other hand, one end of an intake pipe 18 is connected to the circulation path 14 on the upstream side of the throttle portion 17, and the other end of the intake pipe 18 is connected to the air diffuser 9. . The intake pipe 18 is provided with an air pump 19 and a check valve 21 located on the air diffuser 9 side of the air pump 19 (the direction of the air diffuser 9 is the forward direction). By the operation of the air pump 9, the air containing the pollutant that is retained before the throttle portion 17 in the circulation path 14 is taken into the intake pipe 18 and is sent to the diffuser pipe 9 through the check valve 21. Be paid.

  In this embodiment, the air supplied to the air diffuser 9 is discharged into the aqueous solution at the bottom of the water tank 3 in an amount of 1.6 L / min (bubble), and bubbles are formed between the electrodes 4 and 6 for electrolysis and around them. It passes through and rises and is eventually discharged indoors through the exhaust port 8 at the upper end.

  In the figure, reference numeral 22 denotes a control device constituted by a microcomputer or the like, which has a predetermined DC power source and supplies electricity to the electrodes 4 and 6 for electrolysis, as well as the fans 12 and 16, the electric heater 13 and the adsorbing member 11. The motor (not shown) for rotating and the operation of the air pump 19 are controlled.

  With the above configuration, the operation of the air cleaning system 1 of the embodiment in this case will be described. When the air cleaning system 1 is turned on, the control device 22 operates the fans 12 and 16 and the air pump 19 and operates the rotation motor of the adsorption member 11 to rotate the adsorption member 11 at a predetermined speed. The electric heater 13 is energized to generate heat. As the fan 12 is operated, indoor air is circulated to the adsorbing portion (11A) of the adsorbing member 11, and contaminants such as formaldehyde contained in the air are adsorbed and collected by the adsorbing member 11.

  The adsorbing part (11A) eventually reaches the regenerating part (11B) by rotation, and is heated by the high-temperature air heated by the electric heater 13 circulated by the fan 16 there. By being heated, the formaldehyde adsorbed on the adsorbing member 11 is released and travels to the throttle portion 17 of the circulation path 14 together with the high temperature air. The released air containing a large amount of formaldehyde is taken into the intake pipe line 18 by the air pump 19 and reaches the diffuser pipe 9 through the check valve 21. The air supplied to the air diffuser 9 is discharged into the aqueous solution at the bottom of the water tank 3 at a rate of 1.6 L / min (bubbling) as described above, and bubbles are formed between and around the electrolysis electrodes 4 and 6. It passes through, rises and is eventually discharged indoors through the exhaust port 8 at the upper end.

  Here, since the air sent into the aqueous solution easily comes into contact with the aqueous solution, the formaldehyde contained in the air dissolves in the aqueous solution. Thereby, the formaldehyde contained in the air is treated with the aqueous solution and released into the indoor state from the exhaust port 8 in a purified state, whereby the indoor air in which the air purification system 1 is installed is purified. Will be comfortable.

  On the other hand, the control device 22 supplies power to the electrodes 4 and 6 for electrolysis. At this time, the electrode 4 or 6 for electrolysis to which + is applied serves as an anode, and the electrode 6 or 4 for electrolysis to which − is applied serves as a cathode. Moreover, the control apparatus 22 switches the polarity of the electrodes 4 and 6 for electrolysis every 10 minutes, for example. Since the aqueous solution containing formaldehyde in the air contains 200 mg / L of chloride ions as described above, in the electrode 4 or 6 serving as the anode, the chloride ions are charged with electricity. Release chlorine to produce chlorine. Thereafter, this chlorine dissolves in the aqueous solution to produce hypochlorous acid.

Here, the decomposition treatment mechanism of formaldehyde using electrolysis of an aqueous solution will be described with reference to FIGS. FIG. 5 is a perspective view of an experimental apparatus for explaining the mechanism of formaldehyde decomposition, and 31 is a beaker. 300 ml of an aqueous solution containing formaldehyde is stored in the beaker 31, and the same platinum-iridium electrolysis electrodes 4 and 6 as described above are immersed in the aqueous solution. The area of the electrodes for electrolysis 4 and 6 used in the experiment is 150 mm × 35 mm (immersion part 65 mm × 35 mm) (the immersion part is the same in FIGS. 1 and 2), and the distance between the electrodes is the same as described above. 6 mm. Then, a constant current of 450 mA and a current density of 2 A / dm ² was applied to the electrolysis electrodes 4 and 6 by the control device 22, and the aqueous solution during electrolysis was stirred by a magnetic stirrer 32. As will be described later, the aqueous solution contains chloride ions. In the electrode 4 or 6 for electrolysis serving as the anode, the chloride ions emit electricity to generate chlorine (Cl). The chlorine then dissolves in the aqueous solution and produces hypochlorous acid (HClO).

FIG. 6 shows the decomposition reaction of formaldehyde (HCHO) generated in the beaker 31. At this time, the formaldehyde dissolved in the liquid is decomposed by the electrode reaction at the electrolysis electrode 4 or 6 serving as the anode or in the aqueous solution by the solution reaction to generate water and carbon dioxide. Reactions at this time are shown in Reaction Formulas A and B.
Reaction Formula A HCHO + HClO → HCOOH + HCl
Reaction formula B HCOOH + HClO → CO ₂ + H ₂ O + HCl
The HCOOH is formic acid. As a result, formaldehyde in the aqueous solution is decomposed by electrolytic hypochlorous acid.

Here, FIGS. 7 and 8 show the results of decomposition of formaldehyde (HCHO) by hypochlorous acid generated by electrolysis. 7 shows the concentration of formaldehyde and the concentration of formic acid (HCOOH) produced by the decomposition reaction, and FIG. 8 shows the amount of carbon dioxide (CO ₂ ) produced by the decomposition reaction. The conditions are a chloride ion concentration of 1000 mg / L in the aqueous solution and a formaldehyde concentration of 1500 mg / L. It can be seen that formaldehyde is being decomposed smoothly by electrolytic hypochlorous acid.

  Next, FIG. 9 shows the decomposition rate of formaldehyde by electrolytic hypochlorous acid for each concentration of formaldehyde in the aqueous solution. In this case, the concentration of electrolytic hypochlorous acid generated by electrolysis is about 170 mg / L (chloride ion concentration 200 mg / L), white rhombus is formaldehyde concentration 20 mg / L, white square is concentration 200 mg / L, white triangle Indicates the case of a concentration of 2000 mg / L. As can be seen from this figure, the lower the formaldehyde concentration, the higher the decomposition rate. The air discharge amount 1.61 L / min to the water tank 3 described above is set based on the result of this experiment, and by discharging air containing formaldehyde into the aqueous solution in the water tank 3 in such an amount, The concentration of formaldehyde is controlled to be 20 mg / L or less.

  FIG. 10 shows the decomposition rate of formaldehyde by electrolytic hypochlorous acid for each chloride ion concentration in the aqueous solution. In this case, the concentration of formaldehyde in the aqueous solution is 200 mg / L, the x mark indicates the chloride ion concentration 100 mg / L, the white square indicates the concentration 200 mg / L, and the white circle indicates the concentration 1000 mg / L. As can be seen from this figure, the higher the chloride ion concentration, the higher the decomposition rate, but the difference is slight. The chloride ion concentration of 200 mg / L in the aqueous solution in the water tank 3 described above is set based on the result of this experiment, and the formaldehyde in the water tank 3 is effectively decomposed by such an amount.

  Here, a substance such as chalk adheres to the electrode 4 or 6 for electrolysis which becomes a cathode by electrolysis, and the current-carrying efficiency of the electrodes 4 and 6 is lowered. This problem can be solved by switching the polarity. it can. FIG. 11 shows the decomposition rate of formaldehyde when the polarity of the electrodes 4 and 6 for electrolysis is switched every 10 minutes (white circles) and not switched (white squares) as described above. As is clear from this figure, when the polarity is not switched, the increase in the decomposition rate stops with the passage of time, but when the polarity is switched, no decrease in the decomposition rate is observed. In other words, the polarity switching prevents a decrease in energization efficiency due to chalk and the like, thereby preventing a decrease in the decomposition efficiency of formaldehyde in the water tank 3 described above.

  Next, FIG. 12 shows the influence of the pH of the aqueous solution on the decomposition of formaldehyde. As is apparent from this figure, it can be seen that the decomposition rate of formaldehyde decreases rapidly at pH 9 or higher. Therefore, the pH of the aqueous solution in the water tank 3 is also in the range of pH 4 to pH 8 to improve the decomposition rate of formaldehyde.

And FIG. 3 has shown the experimental result at the time of processing the formaldehyde (concentration 0.6ppm) diffused in the chamber of 1 m < ³ > with the air purification system 1 of an Example. In the figure, the white triangle indicates the natural attenuation, the white rhombus indicates the case where the aqueous solution is simulated tap water (chlorine ion concentration 17 ppm), and the white square indicates that the chloride ion concentration of the aqueous solution is 200 mg / L as described above. The change in formaldehyde concentration in the chamber is shown.

  As is clear from this figure, in any aqueous solution, the air purification system 1 was able to reduce the formaldehyde concentration in the chamber to 0.08 mg / L or less, which is the guideline value of the Ministry of Health, Labor and Welfare, in a very short time. . FIG. 4 shows the change in formaldehyde concentration in the aqueous solution in the water tank 3. In the figure, the white rhombus indicates the case where the simulated tap water is used as the aqueous solution, and the white square indicates the change in formaldehyde concentration in the aqueous solution in the water tank 3 when the chloride ion concentration of the aqueous solution is 200 mg / L as described above. Is shown.

As is apparent from this figure, it is found that by introducing 200 mg / L of chloride ions into the aqueous solution, the decomposition efficiency of formaldehyde by hypochlorous acid can be improved and the increase in the concentration in the liquid can be kept low. It was. Furthermore, according to the electrolysis electrodes 4 and 6 of the examples, ozone, oxygen, hydrogen peroxide, or hydrogen peroxide radical, superoxide radical (O ₂ ⁻ ), hydroxy radical (.OH), Since singlet oxygen radicals ('O ₂ ) are also generated, the pollutants contained in the air discharged into the aqueous solution can be decomposed by these.

  Moreover, in the air purification system 1 of this invention, the hypochlorous acid contained in the splashed splash is discharged | emitted indoors from the exhaust port 8 when the air which rose in the water tank 3 as a bubble bounces at the upper part. become. Thereby, formaldehyde contained in the surrounding air is also decomposed and sterilized. The water tank 3 of the embodiment is made of transparent glass that can be seen through, or made of acrylic resin, vinyl chloride resin, polycarbonate, or translucent glass (opaque), so that the discharged air rises as bubbles. The situation can be expressed visually and can be used as a decoration.

  Next, FIG. 13 is a perspective view showing a configuration of an air purification system 1 according to another embodiment of the present invention, and FIG. 14 is a perspective view of the inside thereof. In addition, in each figure, what is shown with the same code | symbol as FIG.1 and FIG.2 shall show | play the same or same function. In this case, the configuration is the same as in FIGS. 1 and 2 except that the circulation path 14 is not provided. Due to the absence of the circulation path 14, in this case, the outside air sucked by the fan 16 is heated by the electric heater 13, and then passes through the portion of the adsorbing member 11 that has turned to the regeneration unit (11 </ b> B). The adsorbing member 11 is heated and releases adsorbed contaminants. The released pollutant gets on the high-temperature air, is sucked into the air pump 19, is taken into the intake pipe 18, and is sent to the diffuser pipe 9 through the check valve 21. Even with such a configuration, contaminants in the air can be collected and subjected to electrolytic treatment.

  Next, FIG. 15 is a perspective view showing a configuration of an air purification system 1 according to another embodiment of the present invention, and FIG. 16 is a transparent side view of the same. In addition, in each figure, what is shown with the same code | symbol as FIG.1 and FIG.2 shall show | play the same or same function. The air cleaning system 1 of the embodiment in this case also has a size that can be installed indoors such as a house, and has a base 42 and a transparent cylindrical shape (or a square cylindrical shape) that is erected on the base 42. A water tank 3 made of transparent glass, acrylic resin, vinyl chloride resin, polycarbonate, or translucent glass (opaque), and at least a pair of electrodes 4 and 6 for electrolysis similar to those described above provided at the bottom of the water tank 3 The air pump 19 and the check valve 21 are disposed in the base 42. Reference numeral 45 denotes a suction cup attached to the bottom corners of the base 42.

  Also in this case, the upper surface of the water tank 3 is closed, and a plurality of exhaust ports 8 are formed around the upper side surface of the water tank 3 below the water tank 3 to communicate the inside of the water tank 3 with the outside. In this water tank 3, for example, a predetermined amount of an aqueous solution containing 5 mg / L or more of halide ions, 200 mg / L in the embodiment, and chloride ions in the embodiment and adjusted to pH 4 to pH 8 is stored. Around the bottom of the water tank 43, a ring-shaped air diffuser tube 9 having a plurality of air discharge narrow ports is disposed in the aqueous solution. Electrodes 4 and 6 are immersed in an aqueous solution.

  The air pump 19 and the check valve 21 are provided in the intake pipe line 18, and one end of the intake pipe line 18 is open to the outside. The other end of the intake pipe 18 is connected to the diffuser pipe 9 in communication. The indoor air containing pollutants is taken into the intake pipe 18 by the operation of the air pump 9 and is supplied to the air diffuser 9 through the check valve 21.

  In this embodiment, the air supplied to the air diffuser 9 is discharged into the aqueous solution at the bottom of the water tank 3 at a rate of 0.01 L / min (bubble), and bubbles are formed between and around the electrodes 4 and 6 for electrolysis. It passes through and rises and is eventually discharged indoors through the exhaust port 8 at the upper end. Further, a photocatalyst 43 and a purple light emitting LED 44 (or a green light emitting lamp) are attached in the water tank 3. The purple light emitting LED 44 emits ultraviolet light (UV) into the water tank 3 in addition to purple light. In addition, the light irradiated to the photocatalyst 43 may be normal visible light in addition to violet light.

  In the figure, reference numeral 22 denotes a control device constituted by a microcomputer or the like, which has a predetermined DC power supply and supplies electricity to the electrolysis electrodes 4 and 6 as well as the operation of the air pump 19 and the purple light emitting LED 44. Control.

  With the above configuration, the operation of the air cleaning system 1 of the embodiment in this case will be described. When the air cleaning system 1 is turned on, the control device 22 operates the air pump 19 and causes the purple LED 44 to emit light. Indoor air containing formaldehyde is taken into the intake pipe 18 by the air pump 19 and reaches the diffuser pipe 9 through the check valve 21. The air supplied to the air diffuser 9 is discharged into the aqueous solution at the bottom of the water tank 3 in an amount of 0.01 L / min or more (bubbling) as described above, and bubbles are generated between the electrodes 4 and 6 for electrolysis and around them. It passes through, rises, and is eventually discharged indoors through the upper exhaust port 8.

  Here, since the air sent into the aqueous solution easily comes into contact with the aqueous solution, the formaldehyde contained in the air dissolves in the aqueous solution. Thereby, the formaldehyde contained in the air is treated with the aqueous solution and released into the indoor state from the exhaust port 8 in a purified state, whereby the indoor air in which the air purification system 1 is installed is purified. Will be comfortable.

  On the other hand, the control device 22 supplies power to the electrodes 4 and 6 for electrolysis. At this time, the electrode 4 or 6 for electrolysis to which + is applied serves as an anode, and the electrode 6 or 4 for electrolysis to which − is applied serves as a cathode. Moreover, the control apparatus 22 switches the polarity of the electrodes 4 and 6 for electrolysis every 10 minutes, for example. Since the aqueous solution containing formaldehyde in the air contains 200 mg / L of chloride ions as described above, in the electrode 4 or 6 serving as the anode, the chloride ions are charged with electricity. Release chlorine to produce chlorine. Thereafter, this chlorine dissolves in the aqueous solution to produce hypochlorous acid.

With this hypochlorous acid, formaldehyde in the aqueous solution in the water tank 3 can be efficiently decomposed as described above. Further, according to the electrodes 4 and 6 for electrolysis of Examples, ozone, oxygen, hydrogen peroxide, or hydrogen peroxide radical, superoxide radical (O ₂ ⁻ ), hydroxy radical (.OH), Since singlet oxygen radicals ('O ₂ ) are also generated, the pollutants contained in the air discharged into the aqueous solution can be decomposed by these. Furthermore, when the air that has risen as bubbles in the water tank 3 can be flipped at the top, hypochlorous acid contained in the splashed splashes is discharged indoors from the exhaust port 8. Thereby, formaldehyde contained in the surrounding air is also decomposed and sterilized.

  In particular, in the air cleaning system 1 in this case, in particular, if the water tank 3 is made of transparent glass that can be seen through, for example, it is possible to visually express how the discharged air rises as bubbles. Become. Thereby, the air purifying system 1 can be used as a decoration such as an interior. Further, since the photocatalyst 43 in the water tank 3 causes an oxidation reaction by the ultraviolet light emitted from the purple light emitting LED 44, the formaldehyde dissolved in the aqueous solution is also decomposed and removed by the oxidation reaction by the photocatalyst 43. Further, since the entire water tank 3 emits purple light by the purple light emitting LED 44, the visual effect is further improved.

  In addition, although the material of the electrodes 4 and 6 for electrolysis was made into platinum-iridium system in the Example, not only it but carbon can also be used. Furthermore, in the examples, formaldehyde is taken as an example, but it is needless to say that contaminants are not limited thereto.

It is a perspective view which shows the structure of the air purifying system of Example 1 of this invention. It is an internal see-through | perspective side view of the air purifying system of FIG. It is a figure which shows the change of the formaldehyde density | concentration in the chamber in the formaldehyde decomposition | disassembly process using the air purifying system of FIG. It is a figure which shows the change of the formaldehyde density | concentration in the aqueous solution in the water tank in the formaldehyde decomposition process using the air purifying system of FIG. It is a figure of the experimental device for demonstrating the decomposition processing mechanism of formaldehyde using hypochlorous acid. It is a figure explaining the decomposition processing mechanism of formaldehyde using hypochlorous acid. It is a figure which shows the change of the formaldehyde density | concentration in the aqueous solution in the beaker of the experimental apparatus of FIG. It is a figure which shows the carbon dioxide amount produced | generated by the experimental apparatus of FIG. It is a figure which shows the formaldehyde decomposition rate for every density | concentration of formaldehyde in the experimental apparatus of FIG. It is a figure which shows the formaldehyde decomposition | disassembly rate for every chloride ion concentration in the experimental apparatus of FIG. It is a figure which shows the formaldehyde decomposition | disassembly rate at the time of switching the polarity of the electrode for electrolysis in the experimental apparatus of FIG. It is a figure which shows the formaldehyde decomposition | disassembly rate with respect to pH of aqueous solution in the experimental apparatus of FIG. It is a perspective view which shows the structure of the air purification system of Example 2 of this invention. It is an internal see-through | perspective side view of the air purifying system of FIG. It is a perspective view which shows the structure of the air purifying system of Example 3 of this invention. It is an internal see-through | perspective side view of the air purifying system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air purification system 2, 42 Base 3 Water tank 4, 6 Electrolysis electrode 7 Contaminant adsorption device 8 Exhaust port 9 Air diffuser tube 11 Adsorption member 12, 16 Fan 13 Electric heater 19 Air pump 22 Control device 43 Photocatalyst 44 Purple light emitting LED

Claims (9)

In an air cleaning system for treating pollutants contained in the air,
A contaminant adsorbing device capable of adsorbing, collecting, releasing, and regenerating the contaminant contained in the air, a transparent water tank for storing the aqueous solution, and an aqueous solution in the water tank Comprising at least a pair of electrolyzing electrodes at least partially immersed,
The aqueous solution is treated by electrolysis, and air containing pollutants released from the pollutant adsorbing device is discharged into the aqueous solution in the water tank so as to be repelled above the aqueous solution and from the exhaust port together with the splashed splashes. An air cleaning system characterized by discharging .   The pollutant adsorbing device is constituted by a rotary adsorbing member in which an adsorbing part through which air containing the pollutant is circulated and a regenerating part that is heated to release the pollutant are continuously formed. The air cleaning system according to claim 1. In an air cleaning system for treating pollutants contained in the air,
A transparent water tank for storing an aqueous solution, and at least a pair of electrolysis electrodes at least partially immersed in the aqueous solution in the water tank,
The aqueous solution is treated by electrolysis, and the air containing the pollutant is discharged into the aqueous solution in the water tank so as to be bounced at the upper part of the aqueous solution and discharged from the exhaust port together with the splashed droplets. Features an air purification system.   The air cleaning system according to claim 3, wherein a photocatalyst is provided in the aqueous solution in the water tank and irradiated with visible light or ultraviolet light.   The electroconductive material constituting the electrode for electrolysis is insoluble to generate hypochlorous acid, ozone, oxygen, hydrogen peroxide, or hydrogen peroxide radical, superoxide radical, hydroxy radical, singlet oxygen radical. The air cleaning system according to claim 1, 2, 3, or 4, wherein the air cleaning system is made of a metal material or carbon.   6. The air cleaning system according to claim 1, 2, 3, 4, or 5, wherein the aqueous solution contains 5 mg / L or more of halide ions.   The air purification system according to claim 1, 2, 3, 4, 5 or 6, wherein the polarity of the electrode for electrolysis is switched.   The air containing a pollutant in the aqueous solution is supplied in an amount of 0.01 L / min or more, claim 1, claim 3, claim 4, claim 5, claim 6 or The air purification system of claim 7.   The pH of the aqueous solution is in the range of pH 4 to pH 8, air according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 7, or claim 8. Clean system.

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