JPH05170610A - Killing method for insect pest and system therefor - Google Patents

Abstract

PURPOSE:To provide the subject killing method capable of pest killing safely to both human health and the environment, also easily applicable on sites normally hard to uniformly apply insecticides on, thus effective on even insect pests being in hiding. CONSTITUTION:Insect pests referred to as indoor pests or offensive pests like cockroach, mite, termite, flea, fly, or mosquito are killed by exposing them to >=0.2ppm of ozone or its combination with a small amount of a nitrogen oxide. Using a pest killer equipped with an ozone-generating means and ozone- decomposing means, the objective pest control can be accomplished efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for controlling harmful insects such as cockroaches, mites, termites, fleas, lice, flies and mosquitoes, and an apparatus therefor.

[0002]

2. Description of the Related Art For exterminating harmful insects such as cockroaches, mites, termites, fleas, lice, flies and mosquitoes, gas, liquid or solid agents are used.

In particular, a repellent drug is widely used for mites and termites, but the drug has a large persistence and has an adverse effect on the human body, and its remanence has an adverse effect on the environment. There are many problems that the effect itself of is weak. There are various problems such as the operation itself such as extermination is often complicated, and a lot of time is required for its processing. The liquid or solid drug has a problem that it is difficult to spread an effective amount of the drug in a place where harmful insects are distributed, such as in a wall of a house or a narrow gap. Furthermore, when a chemical agent using a conventional organic solvent is applied to the inside of the wall, a heat insulating agent may be dissolved, and when a chemical agent using water is applied to the inside of the wall, mold may be generated due to the water content. There were various problems.

Further, as a method for exterminating cockroaches, a method using a catcher or a method using a pseudo food containing a drug is widely used in addition to the method using a drug as in the case of mites. However, these methods are of a waiting type that depends on the behavior of cockroaches and the like, so that it is impossible to completely eliminate the latent cockroaches and the like.

[0005]

[Problems to be Solved by the Invention]
Provided is a method capable of safely controlling pests against both the human body and the environment. According to this method, it was possible to effectively exterminate the lurking pests. In addition, this method is a method for exterminating harmful insects even in areas that could not be exterminated by conventional chemical agents, and it is almost harmless to houses and the like.

[0006]

[Means for Solving the Problems] The present inventor has found that the harmful insects such as cockroaches, mites, termites, fleas, lice, flies, mosquitoes, etc. are exposed to ozone for exterminating these harmful insects. After further study, the present invention has been completed.

That is, the present invention relates to a method for exterminating harmful insects by exposure to ozone, and a harmful insect exterminating device equipped with ozone generating means and ozone decomposing means.

The method and apparatus of the present invention preferably include a relatively closed space such as an ordinary room, a karaoke box, a bus, a train, a hotel, a restaurant, a kitchen, an office, and a wall of a house. Of course, it can be applied even in an open space such as under the floor. It is especially effective for restaurants and karaoke boxes.

The method and apparatus of the present invention are generally applied to control pests called house pests and unpleasant pests. The pests include cockroaches, mites, termites, fleas, lice, flies,
Examples include mosquitoes.

The term "ozone exposure" as used herein means that the space to be treated is rich in ozone so that ozone is brought into contact with harmful insects or the wall or floor of the space, or the harmful insects absorb ozone. It means processing. Also,
The same applies to nitrogen oxide exposure, which will be described later.

The ozone concentration in ozone exposure performed in the present invention is not particularly limited as long as it is an effective amount against pests, but it may be applied at an exposure concentration of 0.2 ppm or more.
Preferably 0.2-500 ppm, more preferably 0.5
Is in the range of up to 100 ppm. The upper limit of the ozone exposure concentration does not have to be particularly limited, but it may be in a range that does not affect ornaments such as paintings and furniture when treating a room or the like. For example, the ozone exposure concentration may fall within the above range, and the ozone exposure concentration of 1.0 to 25 ppm can sufficiently exert the effect of the present invention.

The ozone exposure time to the space is not particularly limited as long as it is an effective exposure time to pests, but it is usually 1
It is 0 minutes or more, preferably 15 minutes to 100 hours, more preferably 30 minutes to 20 hours.

The temperature of the ozone-containing gas emitted due to ozone exposure is not particularly limited, but is usually 0 to
100 ° C, preferably 2-90 ° C, more preferably 5-
It is 80 ° C.

It is sufficient that the temperature of the space being treated is within the same range as the temperature of the emitted gas. Generally, it is carried out within the range of normal room temperature.

The method of ozone exposure is 0.2 ppm
A general method is to diffuse the ozone-containing gas containing ozone in the treatment space at a frequency of once / hour or more for 30 minutes or more in the treatment space.

The ozone concentration of the ozone-containing gas used in such a method is preferably within the same range as the above ozone exposure concentration.

The ventilation frequency is 1 time / hour or more, preferably 2 to 60 times / hour, more preferably 4 to 20 times / hour.
It's time.

The emission time of the ozone-containing gas is not particularly limited, and ozone may be emitted until the ozone exposure concentration described above is reached. It is usually 30 minutes or more, preferably 45 minutes to 150 hours, more preferably 1 hour to 50 hours.

In the present invention, the treatment effect can be further improved by coexisting ozone with nitrogen oxide by coexisting nitrogen oxide with ozone.

At this time, the nitrogen oxide used is known per se as the general formula NO _x . For example, N
_{O, NO 2, N 2 O} 4, N 2 , etc. O ₅ and the like. Usually, they are used in a mixed state. Of course, each can be used alone.

The amount of nitrogen oxide used at this time is defined as the space concentration during the treatment, that is, the molar ratio of ozone and nitrogen oxide (O ₃ /
NO _X) is good as long as it is 1 or more, preferably 3 to 15
The range is 0, more preferably 5 to 100.

The nitrogen oxides may be contained in the ozone-containing gas and released at the same time as the ozone, or may be released into the processing space separately from the ozone. The method is not particularly limited.

Even when nitrogen oxide is used in combination, various conditions such as treatment time and temperature may be within the same range as the above-mentioned conditions for ozone exposure. Further, the nitrogen oxide concentration of the nitrogen oxide-containing gas, the temperature thereof, and the like may be in the same range as the conditions of the ozone-containing gas.

The ozone used in the present invention can be generated by various methods such as a silent discharge method, an ultraviolet irradiation method, and a water electrolysis method. Among them, as a method for easily and compactly generating ozone, there are silent discharge method and ultraviolet irradiation method.

In particular, the silent discharge method is convenient because ozone and nitrogen oxides can be generated together. Further, the ozone generation by the silent discharge type ozone generator is stable, and as a result, the treatment with ozone can be facilitated.

Nitrogen oxides can be generated by the silent discharge type ozone generator described above, or by bubbling nitric acid aqueous solution or the like, or by using combustion exhaust gas of gas such as city gas, natural gas or LNG. is there.

After the treatment by exposure to ozone and / or nitrogen oxides as described above, the ozone is decomposed even if left as it is, but the ozone and / or nitrogen oxides existing in the space are Is preferably removed sufficiently.

Ventilation is simply performed as the method. Ventilate to such an extent that the concentration of ozone and / or nitrogen oxides does not affect the human body.

As a particularly preferred method, there is a method in which the gas in the treatment space is passed through the inorganic catalyst layer to decompose or adsorb ozone and / or nitrogen oxides.

The inorganic catalyst is not particularly limited as long as it decomposes or adsorbs ozone and / or nitrogen oxides, and examples thereof include activated carbon, alumina, silica, cordierite, sepiolite, zeolite, clay minerals, titania, Zirconia, magnesia, iron oxide,
Examples thereof include copper oxide, manganese oxide, and cobalt oxide.

These catalysts can be used alone or in admixture of two or more. Among these catalysts, a catalyst having adsorption ability is preferable. Activated carbon is mentioned as such a specific example. When a catalyst having an adsorption ability such as activated carbon is used, not only unreacted ozone is decomposed but also various components remaining in the space can be adsorbed and removed. Further, an alkali metal compound, an alkaline earth metal compound, a white metal compound or the like may be added or supported on the catalyst. The form of the catalyst layer is not particularly limited, and may be any of powdery granules, granules, pellets, fibers, honeycombs, perforated plates, and the like. The catalyst layer can be used as a packing layer, but is preferably used as a filter. The preferred form of the catalyst is a fibrous form having a small pressure loss, a uniform gas flow, and a high decomposition efficiency. Examples of such a form include a honeycomb form. The most preferable one is an activated carbon honeycomb.

As a device used in the method of the present invention as described above, a pest control device provided with an ozone generating means and an ozone decomposing means is suitable.

Specifically, it is possible to blow air provided with an ozone generating means having a blowing means and an ozone generator in the flow path, and an inorganic catalyst layer capable of adsorbing or decomposing ozone and / or nitrogen oxides. One having an ozone decomposing means and the blowing means being constituted by a fan can be mentioned.

The fan, which is the air blowing means, is composed of at least one fan that blows air to the ozone generating means and the ozone decomposing means in both forward and reverse directions, and a selecting means that selects the air blowing direction. It is more preferable that the device is connected to the adjusting device that adjusts the ozone generation amount in conjunction with the selecting device.

In the ozone decomposing means, a fan separate from the fan used in the ozone dissipating means may be used, but it is preferable that a fan capable of forward and reverse rotation is shared by the ozone generating means and the ozone decomposing means. That is, when a fan capable of rotating in the normal and reverse directions is used, the ozone generating means can rotate the fan in the normal direction to dissipate ozone, and the ozone decomposing means thereafter can reverse the fan to suck unreacted ozone. With one fan, ozone can be diffused and unreacted ozone can be sucked.

It should be noted that the ozone treatment requires about several hours in an average room, and for safety and hygiene, it is preferable to avoid entering the space with a high ozone concentration. The ozone decomposing means and the ozone decomposing means are preferably provided in one compact device, and those which are automatically operated are more preferable.

For example, a typical operation of the device of the present invention will be described below.

The blowing means provided in the apparatus comprises one or a plurality of fans for blowing in both forward and reverse directions, and is provided with blowing direction selecting means. The fan may be composed of one reversible motor fan, or may be composed of two motor fans having different rotation directions. Other than this, it is possible to configure with a plurality of motor fans.

Further, the blowing direction selecting means can be constituted by a changeover switch, a relay, etc., and the selection can be automatically controlled. When performing automatic control, a timer, a gas sensor (ozone sensor, odor sensor, ethylene sensor, etc.) and the like are further provided, and the selection means is configured to interlock with this. This interlocking can be realized by a normal control circuit. The timer and the gas sensor at this time are preferably attached to the main body of the apparatus. However, these timers and gas sensors do not necessarily need to be linked, and may be one informing means.

Further, a silent discharge type ozone generator as an ozone generator is provided with adjusting means for adjusting the amount of ozone generation in conjunction with the air blowing direction selecting means.

Here, "interlocking" means that the amount of ozone generated by the ozone generator is set to the maximum side when the forward (or reverse) blowing is selected by the blowing direction selecting means, while the blowing direction is selected. It means setting the ozone generator of the ozone generator to the decrease side or the stop side when the reverse (or forward) air flow is selected by the means.

More specifically, in the adjusting means, when the air blowing direction is from the inorganic catalyst layer to the ozone generator (forward direction), the Osone generator is set to the maximum ozone generation amount side. However, in the direction from the ozone generator to the inorganic catalyst layer (reverse direction), the ozone generator switches to the ozone generation amount reduction side (or stop side), or the opposite control is performed. Means for doing so are included.

The adjusting means of the ozone generator varies depending on the type of the silent discharge type ozone generator, but an ON-OFF changeover switch and a high output-low output changeover switch which operate according to the mode of the selecting means. And the like.

In the present invention, when a silent discharge system is used as an ozone generator, it is preferable to contact the atmosphere with an acid-supporting adsorbent and then distribute the ozone to the ozone generating electrode to efficiently generate ozone. It is preferable that the device also has this mechanism.

In this case, basic components such as ammonia and amines in the space can be selectively removed, deposition of nitrates and nitrites on the electrode surface of the ozone generator can be prevented or suppressed, and ozone generation efficiency can be improved. Can be stabilized.

Examples of the acid-supporting adsorbent include sulfuric acid,
Examples thereof include those in which an inorganic acid such as phosphoric acid and an organic acid such as oxalic acid, citric acid, and malic acid are supported on a carrier having adsorption ability. Preferable examples of the acid to be carried include sulfuric acid, phosphoric acid and citric acid. Particularly preferred is phosphoric acid. The amount of the acid supported is 2 to 50% by weight, preferably 5 to 40% by weight, based on the total amount of the adsorbent. Examples of the carrier include clay minerals such as activated carbon and allophane, diatomaceous earth, shale, zeolite, sepiolite and activated clay, and those obtained by firing these clay minerals. A preferred carrier is activated carbon. The BET specific surface area of the carrier such as activated carbon is 200 to 2,500 m ³ / g.
Is preferred, and more preferably 500 to 2,000.
It is in the range of 0 m ³ / g. The form of the acid-supporting adsorbent may be any of pellets, granules, perforated plates, plates, macaroni, fibers, honeycombs and the like. The preferred form of the acid-supporting adsorbent is a granular form, a fibrous form, or a honeycomb form. From the above, the most preferable acid-supporting adsorbent is phosphoric acid-supporting activated carbon honeycomb.

The contact temperature between the gas and the acid-supporting adsorbent is not particularly limited, but is, for example, 0 to 100 ° C., preferably 5 to 80 ° C.

The space velocity of the gas in contact with the acid-supporting adsorbent is not particularly limited, but is, for example, 100 to 100.
500,000 hr ^-1 , preferably 500-100,000
It is about hr ^-1 .

In the ozone decomposing step, various catalysts capable of decomposing unreacted ozone remaining in the space into oxygen efficiently and detoxifying after the ozone desorbing step can be used.

Examples of such a catalyst include the above-mentioned inorganic catalysts.

In this ozone decomposition step, in order to decompose the unreacted ozone efficiently, it is preferable that the unreacted ozone in the space is circulated to the catalyst layer by a fan, and the apparatus is also preferably equipped with this mechanism. In this case, the ozone concentration can be reduced to 0.1 ppm or less within a very short time.

The time required for this ozone decomposition step varies depending on the type of catalyst, the capacity of the fan, the ozone concentration, the volume of space, etc., but it is usually 500 minutes or less, preferably 5 to 5 minutes.
It is 250 minutes, more preferably about 10 to 100 minutes.

The space velocity of the gas contacting the inorganic catalyst layer is not particularly limited, but is, for example, 100 to
1,000,000 hr ^-1 , preferably 500 to 500,0
00 hr ^-1 , more preferably 1,000 to 250,000 hr
^-1 .

The temperature during this step is also not particularly limited. Usually, it is performed at room temperature.

If processing is performed under the above conditions,
If nitrogen oxides are also used, they are similarly adsorbed and / or decomposed.

The pest control method and apparatus as described above are
Normal closed room (office, living room, kitchen, entrance, etc.)
In that case, the device may be installed in the room and applied as described above. At that time, since ozone and nitrogen oxides are gases themselves and have excellent diffusibility, it is possible to control pests in every corner of the treatment space. Furthermore, it penetrates into carpets, furniture (sofas, etc.), and it is possible to treat areas where pest control is usually quite difficult. Therefore, cockroaches, flies, mosquitoes, etc. lurking in the corners of the room are removed, and fleas, lice, etc. lurking in the carpet of the room are also removed.

The termites are present under the floor of the house or inside the wall. Currently, termites are exterminated by spraying a disinfectant under the floor, but it is difficult to evenly disperse the drug inside the wall. However, by using the method of the present invention, not only the underfloor treatment but also the inside of the wall can be easily treated by utilizing the above-mentioned properties of ozone and nitrogen oxides.

For example, in the case of underfloor treatment, the generated ozone or nitrogen oxide may be pushed under the floor by a fan to treat the inside of the floor. At this time, if the ventilation holes and the like under the floor are blocked, the extermination effect will be further enhanced. In addition, when processing the inside of the wall of a house, etc., use a nozzle,
Pests can be easily exterminated by introducing the generated ozone or nitrogen oxide into the wall. Further, a punching method can be similarly adopted. As a piercing process, a straight 6 to 13 mm drill is usually used to pierce a hole to a depth of 1/2 or more of wood, and ozone or nitrogen oxides are introduced by a nozzle into the hole, and a wood plug (length) 3c
m or more) is preferable. In the case of such treatment of the underfloor or the inside of the wall, ozone and nitrogen oxides may be recovered as a post-treatment in the same manner as described above, but this post-treatment is not particularly required.

If the pests are exterminated by the method and apparatus of the present invention, most of the pests can be exterminated and killed.

[0060]

EFFECT OF THE INVENTION According to the method of the present invention, ozone used has no residue and is very clean, and pests can be exterminated in a short time by a simple operation. Further, since it is possible to process every corner of the processing space, the extermination effect is great.

Further, the ozone remaining in the space after the ozone treatment is gradually decomposed with time, but by using the inorganic catalyst layer, it is safe because oxygen can be decomposed in a shorter time.

By using the device of the present invention, the above-mentioned control of unpleasant pests can be easily carried out.

[0063]

【Example】

[Example 1] Extermination by ozone One room in an office with an internal volume of 25 m ³ (indoor temperature: 24.5)
(6) Put 6 cockroaches with a body length of about 8.5 mm in this chamber, and in this chamber, an ozone generator of ultraviolet irradiation type (ozone generation amount 50
0 mg / hr) and a fan (air volume 2.1 m ³ / min) are installed in the ozone diffuser, and the atmosphere containing 2 ppm of ozone (temperature: 25.8 ° C.) is 126 m ³ / hr (ventilation rate approx. 5 times / H) for 2 hours. About 40 minutes after the start of ozone emission, the ozone concentration in the room reached 1.65 ppm and was in an almost equilibrium state (room temperature: 25.5 ° C.).

Six hours after the end of ozone emission, the ozone concentration in the room reached 0.02 ppm. When the room door was opened and the room was observed, one of them was lying on his / her back on the floor and was dead, and the other five were quite weak.

[Example 2] Extermination with ozone and nitrogen oxides Six cockroaches having a length of about 8.5 mm were placed in the same chamber (indoor temperature: 24.5 ° C) as in Example 1, and the silent discharge system was used in this chamber. The ozone dissipator equipped with an ozone generator (ozone generation amount: 500 mg / hr) and a fan (air flow rate: 2.1 m ³ / min) is installed, and 1.5 ppm ozone and 0.04 ppm nitrogen oxide are hermetically sealed. 12 atmospheres (temperature: 25.8 ° C)
It was circulated at 6 m ³ / hr for 1 hour. About 40 minutes after the start of ozone and nitrogen oxide emission, the ozone concentration in the room was 1.0.
5ppm, the concentration of nitrogen oxides is 0.10ppm (O ₃ / N
O _X molar ratio: 10.5) to reach almost equilibrium (room temperature has been a 25.5 ° C.).

After 6 hours from the end of the emission of ozone-nitrogen oxide-containing gas, 2.1 m ^{3 of} room air was introduced into an activated carbon honeycomb (cell number: 300 / inch ² ; thickness: 20 mm) having a cross-sectional area of 1,850 cm ^2. It was distributed and circulated at the rate of / hr. After 30 minutes of distribution, the concentrations of ozone and nitrogen oxide were both 0.05 pp
It became less than m. When the room door was opened and the room was observed, 4 animals remained lying dead on their backs on the floor. 2
The animals were quite weak.

[Embodiment 3] Extermination device [Fig. 1] shows an extermination device (7A) of the present invention, in which a box-shaped gas flow path (1490 cm ³ ) is provided with one opening 1 and activated carbon. Inorganic catalyst layer 3 made of honeycomb, silent discharge ozone generator 4, acid-supporting absorbent layer 5 (H ₃ PO ₄ -30% supported activated carbon pellets) for treating a part of gas supplied to the ozone generation electrode, inversion Possible fans 6 and the other opening 2 are arranged in this order.

In addition to the ON-OFF switch, the fan 6 is provided with a changeover switch (not shown) by a timer so that the airflow direction can be changed. Further, by selecting this changeover switch, the airflow direction can be changed to the drawing. The output of the ozone generator is set to be maximum (frequency 1.8 kHz, voltage 7.0 KVpp) when it changes from left to right, and conversely, when the blowing direction changes from right to left Is provided with ozone generation amount adjusting means (not shown) including a switching control circuit for making the output of the device zero (stop).

FIG. 3 is a schematic view showing the relationship between the space 8 to be exterminated and the extermination device 7A.

The drive and function of the extermination device 7A will be described.

(1) First, the gas flows from the opening 1 to the opening 2.
The direction of rotation of the fan 6 is set so that the fan flows. At this time, the ozone generator 4 should be set so that the ozone generation amount becomes maximum.
Is set, and the suction gas and ozone are uniformly mixed by the fan 6, and then the mixed gas is discharged from the opening 2. As a result, a certain concentration of ozone diffuses in the space, and exerts an effect of exterminating pests.

Since the gas flowing through the ozone generator is treated by the acid-supporting adsorbent layer 5, the deterioration of the electrode surface of the ozone generator 4 is significantly controlled.

The gas that has passed through the catalyst layer 3 is remixed with ozone as described above, and diffuses again into the space. By continuing the operation for a certain period of time, the ozone concentration in the space becomes almost constant and the action continues.

(2) On the other hand, the direction of rotation of the fan is reversed so that the gas flows from the opening 2 to the opening 1.
At this time, the ozone generator 4 is set so that the ozone generation amount becomes zero.

As a result, the sucked gas passes through the catalyst layer 3,
Unreacted surplus ozone is completely decomposed, and it does not harm human bodies and animals.

By controlling the operations (1) and (2) and / or stopping the entire apparatus with a timer, an ozone sensor 9 or the like, the pests can be easily exterminated automatically.

The operations (1) and (2) and / or the stopping of the apparatus can be repeated. This automatic control can be performed by switching the blower direction selecting means of the fan 6 at predetermined intervals by a timer attached to the apparatus body or based on the magnitude of the output of the ozone sensor.

[Example 4] Extermination device [Fig. 2] shows another extermination device 7B of the present invention, in which one opening 1 is provided in a box-like gas flow path (23920 cm ³ ).
An inorganic catalyst layer 3 made of an activated carbon honeycomb supporting 5 wt% potassium carbonate, a reversible fan 6, an ozone generator 4, and an acid-supporting adsorbent layer 5 (H ₂ SO ₄₎ for treating gas supplied to the ozone generator. -10 wt% supporting honeycomb) and the other opening 2 are arranged in this order.

Reference numeral 10 is an air pump for supplying gas to the ozone generator.

In addition to the ON-OFF switch, the fan 6 is provided with a change-over switch (not shown) for changing its blowing direction. By selecting this change-over switch, the blowing direction is changed from right to left in the drawing. The maximum output of the ozone generator (frequency 11.76KHz, voltage 8.4KVp
p)), and when the blowing direction is from left to right, the output of the ozone generator is minimum (frequency 1.5 Hz).
, And an ozone generation amount adjusting means (not shown) comprising a switching control circuit for adjusting the voltage to 8.4 KVpp).

The drive and function of the processing device 7B will be described.

(1) First, gas flows from the opening 1 to the opening 2.
The direction of rotation of the fan 6 is set so that the ozone flows to the ozone generator 4 so that the ozone generation amount is minimized.
Is set, the suction gas and ozone are mixed, the mixed gas is discharged from the opening 2, and ozone having a relatively low concentration diffuses into the space to exert an action.

Since the ozone concentration in this space is relatively low, the atmosphere is maintained so as not to harm human bodies, animals, foods and the like.

(2) On the other hand, the direction of rotation of the fan is reversed so that the gas flows from the opening portion 2 to the opening portion 1 so that the ozone generation amount is set to the maximum, whereby the suction gas By mixing ozone with the fan 6 and allowing it to evenly flow through the catalyst layer, the ozone is also almost completely decomposed in the catalyst layer and becomes a clean gas, which exits from the opening 1 into the space.

The operation of stopping the (1) and (2) and / or the apparatus, and the repeating operation of (1), (2) and / or the stopping of the apparatus are the same as described above, such as the timer and the ozone sensor 9. Controlled by.

[Embodiment 5] Exterminator [FIG. 4] is a block diagram showing another exterminating apparatus of the present invention.
The drive and function are almost the same as those in the third and fourth embodiments.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an extermination device. FIG. 2 is a structural explanatory view showing an example of the extermination device. [Fig. 3] Fig. 3 is a schematic diagram showing the relationship between the space to be exterminated and the extermination device. FIG. 4 is a structural explanatory view showing an example of the extermination device.

[Explanation of symbols]

 1, 2: Opening part 3, 11: Inorganic catalyst layer 4, 12: Ozone generator 5, 14: Acid-supporting adsorbent layer 6, 15: Fan 7: Ozone treatment device 8: Ozone treatment space 9: Ozone Sensor 10, 13: Air pump

Claims (3)

[Claims] 1. A method for controlling harmful insects by exposure to ozone. 2. The method according to claim 1, wherein the pests are exterminated by exposure to nitrogen oxide together with exposure to ozone. 3. A pest control device comprising ozone generating means and ozone decomposing means.