JP2008161573A - Air purifying method and its apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air purifying method capable of easily removing floating particles in the air, especially, an oily odorous component with low oil content, and to provide its apparatus. <P>SOLUTION: Air bubbles 5 are generated from the air 1a containing the floating particles and the water solution 3 of a surface-active agent. The odorous component is removed by allowing the floating particles to be adsorbed to the surfaces of the air bubbles 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air purification method and apparatus for removing suspended particles in the air, and more specifically, suspended particles such as dust, bacteria, pollen and oily odor substances having low oil content floating in the air. The present invention relates to an air purification method and an apparatus for removing it by adsorbing it to bubbles of an aqueous solution.

  Conventionally, by combining an electrostatic precipitator, a mist collector, and an activated carbon air purifier in an appropriate order, high and low viscosity tar, which is an oily odor component floating in the air, is efficiently collected and removed. There is known a method and apparatus for cleaning a flue gas adsorption air (see Patent Document 1).

However, this flue gas adsorption air purification device has a problem that the purification effect decreases if the oil content of the oily odor component is low. There is also a problem that airborne particles other than oily odor components such as dust, bacteria, pollen, etc. cannot be easily removed from the air.
Japanese Patent No. 2958735

  An object of the present invention is to provide an air purification method and apparatus capable of easily removing airborne particles, particularly oily odor components having a low oil content, from the air.

  In order to achieve the above object, the present invention is characterized in that bubbles are generated from air containing suspended particles and an aqueous solution of a surfactant and are removed from the air by adsorbing the suspended particles on the surface of the bubbles. This is an air purification method.

  The surfactant is a nonionic surfactant. The suspended particles are at least one selected from dust, bacteria and pollen.

  When the suspended particles are oily odor components, the oily odor components adsorbed on the bubble surface are emulsified with a surfactant. Moreover, the organic solvent contained in the oily odor component emulsified with the surfactant is decomposed with a lactic acid bacterium, Lactococcus Lactis.

  The air purification apparatus of the present invention to which the above air purification method is applied has a perforated plate disposed above a mixing means for generating a mixture of a gas containing suspended particles and an aqueous solution of a surfactant, and the mixture is provided with the mixture. It is characterized in that air bubbles are generated by spraying on the perforated plate, and a dehumidifier or activated carbon is disposed on the downstream side of the perforated plate.

  In addition, when the suspended particles are an oily odor substance, this air purification device applies a liquid containing an oily odor component emulsified with a surfactant on the culture medium of lactic acid bacteria Lactococcus Lactis. A processing apparatus is provided.

  According to the air purification method of the present invention, bubbles are generated from air containing suspended particles and an aqueous solution of a surfactant, and the suspended particles are adsorbed on the surface of the bubbles and removed from the air. Particles, particularly oily odor components having a low oil content, can be easily removed from the air.

  Embodiments of the present invention will be described below with reference to the drawings.

  An air purification apparatus according to an embodiment of the present invention is shown in FIGS.

  This air purification device is a perforated plate after sucking air 1a containing suspended particles with a blower 2 and mixing it with an aqueous solution of a surfactant (hereinafter simply referred to as “aqueous solution”) 3 in a mixing means 4. The bubbles 5 are generated by spraying on the punching metal 6.

  A duct 9 for introducing air 1a containing suspended particles is connected to the suction port of the blower 2, and an air guide pipe 10 leading to the lower part of the air purification device is provided on the outlet side. Examples of the suspended particles include dust, bacteria, and pollen other than oily odor components, and xylene, toluene, and resin gas as oily odor components. The aqueous solution 3 is stored at the bottom of the air purifier, and the mixing means 4 is installed so as to be immersed therein.

  The mixing means 4 comprises a support plate 12 having an opening 11, and a swash plate 13 is attached so that the upper space of the opening 11 gradually becomes narrower from the outlet of the air guide tube 10 to above the opening 11. It has been.

  A plurality of reversing plates 14 whose inner surfaces are formed in an arc shape are installed on the upper surface and above the support plate 12. Above those reversal plates 14, a punching metal 6, first to third foam cutting plates 7A to 7C, and a dehumidifier 8 are arranged in this order.

  A large number of small holes 15 having a size of about 1 to 5 mm are formed in the punching metal 6 and are attached in a lid shape so as to wrap the reversing plate 14. The foam cutting plates 7A to 7C are configured by combining a plurality of metal flat plates in a shade shape.

  The operation of the air purification apparatus having such a structure will be described below.

  The air 1 a containing suspended particles sucked into the blower 2 through the duct 9 flows toward the reversal plate 14 via the air guide tube 10. Since the upper space of the opening 11 that passes at this time gradually becomes narrower from the outlet of the air guide tube 10 toward the opening 11, the air 1a containing suspended particles has a higher flow velocity and at the same time the pressure decreases. As shown in FIG. 3, the aqueous solution 3 is sucked from the opening 11 to become a gas-liquid mixture 16. The gas-liquid mixture 16 collides with the reversing plate 14, is changed in direction by moving along the inner surface thereof, and is sprayed onto the bottom surface of the punching metal 6.

  The inner surface shape and installation position of the reversing plate 14 are preferably set so that the gas-liquid mixture 16 sprays evenly on the bottom surface of the punching metal 6. For example, a part of the reversing plate 14 is deformed to change the gas-liquid mixture 16. The flow direction may be adjusted.

  The gas-liquid mixture 16 sprayed on the punching metal 6 generates bubbles 5 when passing through the small holes 15 because the surfactant lowers the surface tension of the water and makes it easier to spread the surface of the water. By generating the bubbles 5 in this way, the contact surface area of the aqueous solution 3 is increased, so that the suspended particles are removed by being adsorbed on the surface of the bubbles 5. Further, when the suspended particles are oily odor components, they are further emulsified by reacting with the surfactant after being adsorbed in the bubbles 5, so that they can be easily removed even when the oil content is small.

  The surfactant is nonionic (nonionic), which is less likely to generate bubbles than cationic or anionic (ionic) so that the generation of bubbles 5 is confined near the lower end of the foam cutting plate 7A. For example, polyoxyethylene ether and polyalkylene alkyl ether are preferably used. In addition, even if this nonionic surfactant produces too much amount of bubbles 5, for example, a silicone emulsion antifoaming agent is added to adjust the amount of production.

  In addition, when the suspended particles are bacteria, an antibacterial agent (for example, a silver ion system, a zinc ion system, or an organic system) is added to the aqueous solution 3 in advance in order to suppress the growth of bacteria in the air purification device. It is recommended to add a disinfectant.

  The bubbles 5 are crushed after a certain period of time, and fall into an aqueous solution 17 in which the suspended particles are mixed (emulsion when the suspended particles are oily odor components) and fall and stay there. Further, the air 1b from which the suspended particles have been removed collides with the first to third foam cutting plates 7A to 7C and drains while flowing upward, and the moisture 19 falls downward. Then, after being dried by the dehumidifier 8, it is discharged from the exhaust port 18 to the outside. When the suspended particles are oily odor components, it is desirable to arrange an activated carbon filter instead of the dehumidifier 8 to adsorb the remaining odor components.

  As described above, the suspended particles contained in the air can be efficiently removed by adsorbing on the surface of the bubbles generated from the aqueous solution of the surfactant. Even when the suspended particles are oily odor components having a low oil content, they can be easily removed because they are adsorbed on the bubble surface and further emulsified.

  Moreover, since this air purification apparatus has few filters and the fall of a pressure loss is small, it can reduce a driving cost by reducing a blower in size.

  If an organic solvent such as toluene or xylene remains in a solution containing the emulsion 17 (hereinafter simply referred to as “treatment solution”) generated by purifying air containing an oily odor component, it is directly released to the external environment. It is not possible. Therefore, it is necessary to decompose and detoxify the organic solvent in the treatment solution.

  FIG. 4 is a processing apparatus for processing solution generated in the air purification apparatus of the present invention.

  This treatment apparatus decomposes the organic solvent contained by repeatedly flowing the treatment solution through the culture medium 21 of the lactic acid bacterium Lactococcus Lactis (hereinafter simply referred to as “lactic acid bacterium”) contained in the housing 20. To do.

  The culture medium 21 is a piece of wood, humus or charcoal planted with lactic acid bacteria, and is fixed with a filter 22 at the top and bottom. A plurality of spray nozzles 28 for spraying the treatment solution toward the culture medium 21 are installed above the culture medium 21.

  The wall 23 of the housing 20 that houses the culture medium 21 and the spray nozzle 28 is made of a heat insulating material, and the inside thereof is controlled by a control means (not shown) that controls the heating temperature of the heater 25 based on the measured value of the temperature monitor 24. The temperature of the lactic acid bacteria becomes active (for example, about 30 to 40 ° C.).

  A circulation pump 26 and a circulation pipe 27 that connect the lower portion of the housing 20 and the spray nozzle 28 are installed outside the housing 20.

  The operation of this processing apparatus will be described below.

  The processing solution 31 introduced from the air purification device into the housing 20 through the water absorption pipe 29 and stored in the lower part is pumped up through the circulation pump 26 and the circulation pipe 27 and is sprayed from the spray nozzle 28 toward the culture medium 21. The organic solvent contained in the sprayed treatment solution 31 is decomposed by the action of lactic acid bacteria while flowing down the surface of the culture medium 21.

  After performing this process continuously or intermittently for a predetermined time (for example, about 48 to 100 hours), the processing solution 31 is discharged to the outside through the drain pipe 30.

  By providing such a treatment device in the air purification device, even if the organic solvent remains in the treatment solution generated when purifying the air containing the oily odor component, it can be rendered harmless and released to the external environment. can do.

It is sectional drawing of the air purification apparatus which consists of embodiment of this invention. It is side part sectional drawing of the air purification apparatus which consists of embodiment of this invention. It is a lower expanded sectional view of the air purification apparatus in FIG. It is sectional drawing of the processing apparatus with which the air purification apparatus of this invention is provided.

Explanation of symbols

1a Air containing suspended particles 3 Surfactant aqueous solution 4 Mixing means 5 Bubbles 6 Punching metal

Claims (8)

  An air purification method for removing air from air by generating air bubbles from air containing airborne particles and an aqueous solution of a surfactant and adsorbing airborne particles to the surface of the air bubbles.   The air purification method according to claim 1, wherein the surfactant is a nonionic surfactant.   The air purification method according to claim 1, wherein the suspended particles are at least one selected from dust, bacteria, and pollen.   The air purification method according to claim 1 or 2, wherein the suspended particles are oily odor components, and the oily odor components adsorbed on the bubble surface are emulsified with a surfactant.   The air purification method according to claim 4, wherein an organic solvent contained in the oily odor component emulsified with a surfactant is decomposed with a lactic acid bacterium, Lactococcus Lactis.   An air purification device in which a perforated plate is disposed above a mixing means for generating a mixture of a gas containing suspended particles and an aqueous solution of a surfactant, and the mixture is blown onto the perforated plate to generate bubbles. .   The air purifier according to claim 6, wherein a dehumidifier or activated carbon is disposed downstream of the perforated plate.   The floating particle is an oily odor substance, and includes a treatment device for flowing a liquid containing the oily odor component emulsified with a surfactant over a culture medium of lactic acid bacteria Lactococcus Lactis. The air purification apparatus according to claim 7.

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