JP3009251B2 - Ozone treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ozone treatment apparatus. In more detail, using the oxidizing power of ozone, deodorization, sterilization, freshness maintenance, pest control of food factories, food storage, pharmaceutical factories, animal breeding rooms, hospitals, clean rooms, hotels, snacks, karaoke, households The present invention relates to a device for extermination.

[0002]

2. Description of the Related Art The method of deodorizing and sterilizing using ozone is as follows.
Conventionally known, for example, various proposals have been made on specific methods and implementation devices thereof (Japanese Patent Application Laid-Open Nos. 54-119371, 62-57557, 63-57).
No. 599961 and Japanese Utility Model Application Laid-Open No. 63-197747).

[0003] However, in these methods, ozone has an effect on human bodies and animals, the operation is complicated,
There have been various problems such as a large device, a long processing time, and inefficient deodorization and sterilization.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a single compact device that performs simple and efficient treatments such as deodorization, sterilization, freshness maintenance and pest control in a space, and is applicable to human bodies, animals, foods and the like. It is an object of the present invention to provide a device capable of efficiently decomposing residual ozone that causes harm to the device.

[0005]

Thus, according to the present invention, the apparatus main body is provided with two openings for forming a gas flow path, and a blowing means and a silent discharge type ozone generator are provided in the gas flow path. A device, an inorganic catalyst layer capable of adsorbing or decomposing at least ozone and an acid-carrying adsorbent layer for gas pretreatment supplied to the ozone generator are disposed,
One or a plurality of fans for blowing air in both forward and reverse directions and a blowing direction selecting means, and the ozone generator has an adjusting means for adjusting the amount of ozone generated in conjunction with the blowing direction selecting means. An ozone treatment apparatus is provided.

According to the present invention, a fan, a silent discharge type ozone generator, an ozone adsorbing / decomposing catalyst layer, and a gas supplied to the ozone generator are provided in a gas flow path set in the apparatus main body with two openings. By disposing an acid-carrying adsorbent layer for pretreatment and changing the amount of generated ozone and the flow direction of gas, deodorization, sterilization, freshness maintenance,
This is an ozone treatment apparatus configured so that treatment such as pest control and decomposition of residual ozone can be performed easily and reliably.

In the apparatus of the present invention, the air blowing means is disposed between the opening and the ozone generator, between the ozone generator and the inorganic catalyst layer, and between the inorganic catalyst layer and the opening. In particular, in the gas flow path, it is suitable to arrange the blower, the ozone generator, and the inorganic catalyst layer in this order, or to arrange the ozone generator, the blower, and the inorganic catalyst layer in this order. . The acid-carrying adsorbent layer is provided for pre-treating the gas supplied to the ozone generator.

[0008] The blowing means of the present invention comprises one or a plurality of fans for blowing in both forward and reverse directions, and comprises blowing direction selecting means. The fan may be configured with one reversible motor fan, may be configured with two motor fans having different rotation directions from each other, and may be configured with a plurality of motor fans. Further, the blowing direction selecting means can be constituted by a changeover switch, a relay or the like, and the selection can be automatically controlled. In the case of performing automatic control, a timer, a gas sensor (an ozone sensor, an odor sensor, an ethylene sensor, etc.) are further provided, and the selecting means is configured to operate in conjunction therewith. This interlock can be realized by a normal control circuit. In this case, it is preferable that the timer and the gas sensor are attached to the apparatus main body. However, these timers and gas sensors do not necessarily have to be linked, and may be one notification means.

The silent discharge type ozone generator according to the present invention is provided with adjusting means for adjusting the amount of ozone generated in conjunction with the blowing direction selecting means. Here, “interlock” means
When forward (or reverse) airflow is selected by the airflow direction selection means, the amount of ozone generated by the ozone generator is set to the maximum side, while airflow in the reverse (or forward) direction is selected by the airflow direction selection means. Means that the ozone generation amount of the ozone generator is set to a decreasing side or a stopping side. More specifically, when the blowing direction is the direction (positive direction) from the inorganic catalyst layer to the ozone generator, the amount of ozone generated by the ozone generator is set to the maximum side. In the direction (reverse direction) from the generator to the inorganic catalyst layer, the means for switching and setting the ozone generation amount of the ozone generator to the decreasing side (or the stop side), or the means for performing the reverse control is used. included.

Although the adjusting means of the ozone generator differs depending on the type of the silent discharge type ozone generator, an ON-OFF switch, a high output-low output switch, etc., which operates in accordance with the mode of the selecting means. Can be constituted by the switching means. The acid-carrying adsorbent layer in the present invention is provided for pretreating a gas supplied to the silent discharge type ozone generator, usually a part of the gas to be treated or the atmosphere.
In particular, the acid-supporting adsorbent layer removes ammonia and amines contained in a part of the gas to be treated or in the air, and forms ammonia, amine nitrates and nitrite on the electrode surface in a silent discharge ozone generator. It is useful for stabilizing ozone generation efficiency by preventing or suppressing generation and deposition of ozone.
When the ozone generation amount is set to the stop side by the blowing direction selection means or the like, by purging the inside of the electrode with the gas supplied to the electrode of the ozone generator, piping before and after the electrode of the ozone generator, This purging is a preferred embodiment of the present invention because the equipment, etc., can be protected from corrosion degradation by ozone gas.

As such an acid-carrying adsorbent, for example,
An inorganic acid such as sulfuric acid or phosphoric acid, for example, an organic acid such as oxalic acid, citric acid or malic acid is converted into activated carbon (BET specific surface area 2
00-2500 m ² / g) or clay minerals (including calcined ones) such as allophane, diatomaceous earth, shale, zeolite, sepiolite and activated clay, and those supported on a mixture of activated carbon and these clay minerals.

Examples of the shape of the acid-supporting adsorbent layer include pellets, granules, perforated plates, plates, macaroni, honeycombs, and fibers.
Fibrous is preferred. The amount of acid carried on the adsorbent is 2 to 50 w
t% is suitable, and 5 to 40 wt% is preferable.

In particular, sulfuric acid, phosphoric acid, or citric acid is added to a pellet, honeycomb, or fibrous activated carbon having a specific surface area of 500 to 2,000 m ² / g in an amount of 5 to 40 wt. % Is most preferred. As a method of supporting an acid, a method of spraying an acid aqueous solution on an adsorbent, a method of immersing the adsorbent in an acid aqueous solution, and impregnating the activated carbon and clay mineral as an adsorbent, knead the acid aqueous solution before molding. And a method of carrying. After loading, drying is performed as necessary.

The temperature at which a part of the gas to be treated or the atmosphere is brought into contact with the acid-carrying adsorbent is 0 to 100 ° C., preferably 5 to 80 ° C., and the space velocity of the gas with respect to the acid-carrying adsorbent is 100 to 100 ° C. 500,000 hr ^-1 , preferably 500 to
100,000 hr ^-1 . By bringing a part of the gas to be treated or the atmosphere into contact with the acid-carrying adsorbent, various trace components of the gas are removed as described above. In particular, it is considered that ammonia, amines, and the like exhibiting basicity are selectively removed, the by-product of nitrate on the surface of the ozone generation electrode is suppressed, and the ozone generation efficiency can be stabilized.

Prior to contacting a part of the gas to be treated or the atmosphere with the acid-carrying adsorbent, the gas is first brought into contact with activated carbon (specific surface area: 500 to 3000 m ² / g) to obtain hydrocarbons, aldehydes and carboxylic acids. It is important to previously remove trace multi-components such as sulfur compounds in order to further improve the ozone generation efficiency. The inorganic catalyst layer in the present invention may be any layer capable of adsorbing or decomposing ozone and capable of aeration, and more preferably a layer capable of promoting deodorization and sterilization in the presence of ozone. Specific examples of this include, for example, activated carbon, alumina,
Silica, cordierite, sepiolite, zeolite,
Clay minerals, titania, zirconia, magnesia, iron oxides, copper oxides, manganese oxides, cobalt oxides, etc., alone and in mixtures thereof. In addition, an alkali metal compound, an alkaline earth metal compound, a platinum group compound, or the like may be added to or supported on a single product or a mixture thereof. In particular, the activated carbon type is suitable for improving the ozone treatment efficiency in the present apparatus. The contact treatment with the inorganic catalyst layer is performed by passing the gas to be treated through a granular filler layer of the inorganic catalyst layer or a filter such as a fibrous, honeycomb, or perforated plate. And a filter is preferably used. In particular, honeycomb filters have low pressure loss,
This is most preferable because the gas flow becomes uniform. In this case, one kind of these filters may be used, but in some cases, two or more kinds of filters may be appropriately combined to improve the deodorizing effect, the sterilizing efficiency, and the ozone decomposing efficiency.

When the apparatus of the present invention is driven, the ozone treatment conditions vary depending on the odorous components, bacteria, pests, the type of space, and the like. 10,000 ppm, preferably 0.2 to 5,000 ppm, more preferably 0.1 ppm.
It is preferable to adjust so as to be within the range of 4 to 2,500 ppm, the ozone treatment time (ozone release time) is 1 minute or more, preferably 5 minutes or more, and the treatment temperature is -50 to
100 ° C, preferably -30 to 70 ° C.

[0017]

The switching of the blowing direction and the ON / OFF of ozone generation or the switching of the amount of ozone generation are performed in conjunction with each other.
By switching the blowing direction, for example, processing mainly on deodorization by ozone release, sterilization, keeping freshness, extermination of insect pests, and processing mainly on adsorption and decomposition removal of ozone by the inorganic catalyst layer can be changed to the situation. This can be selectively performed by one device in response.

At this time, the acid-carrying adsorbent layer prevents or suppresses the adverse effects of trace components in the gas to be treated on the electrode surface of the ozone generator during deodorization, sterilization, freshness maintenance and pest control by ozone release. Thus, it works to further improve the ozone treatment efficiency, and when the ozone generator is stopped, it works to prevent corrosion and the like in the system. Therefore, according to the apparatus of the present invention, deodorization, sterilization, freshness maintenance, pest control and subsequent post-processing can be efficiently and stably performed by one apparatus. Here, pests include cockroaches, mites, termites, fleas,
House pests such as lice, flies, and mosquitoes are also referred to as unpleasant pests.

[0019]

The present invention will be described in more detail with reference to the following examples. First, FIG. 1 shows a processing apparatus (7A) according to an embodiment of the present invention, which has a box-shaped gas flow path (149).
0 cm ³ ), one opening 1, an inorganic catalyst layer 3 made of activated carbon honeycomb, a silent discharge type ozone generator 4, and an acid-carrying absorbent layer 5 (H) for treating a part of gas supplied to an ozone generation electrode. ₃ PO ₄ -30% -supported activated carbon pellets), a reversible fan 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) using a timer so that the airflow direction can be changed. Further, by selecting this changeover switch, the airflow direction is changed from the left of the drawing. When the output becomes right, the output of the ozone generator is set to the maximum (frequency: 1.8 kHz, voltage: 7.0 KVpp). Conversely, when the blowing direction changes from right to left, the output of the ozone generator is changed. An ozone generation amount adjusting means (not shown) including a switching control circuit for making the output zero (stop) is provided. FIG. 3 is a schematic diagram showing the relationship between the space 8 to be subjected to ozone treatment and the ozone treatment device 7A.

The drive and function of the processing device 7A (FIG. 1) will be described. First, the rotation direction of the fan 6 is set so that the gas flows from the opening 1 to the opening 2. At this time, the ozone generator 4 is set so that the amount of generated ozone is maximized, the suction gas and ozone are uniformly mixed by the fan 6, and the mixed gas is discharged from the opening 2.
As a result, high-concentration ozone diffuses into the space, and the ozone reacts with odorous components, floating bacteria, ethylene, etc. in the space,
In addition, ozone acts on foods, attached bacteria, pests, and the like existing in the space, and exerts effects such as deodorization, sterilization, freshness maintenance, and pest control. Further, since the gas flowing through the ozone generator is treated by the acid-carrying adsorbent layer 5, deterioration of the electrode surface of the ozone generator 4 is significantly controlled.

At this time, the gas sucked by the fan contains unreacted unpleasant odor components, ethylene, floating bacteria, ozone, etc., which come into contact with the catalyst layer 3 through the opening 1. Thus, they are efficiently decomposed, and the effects of deodorization, sterilization, and freshness maintenance are further improved. 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 this operation for a certain period of time, the ozone concentration in the space becomes almost constant, deodorizing, sterilizing,
The effect of maintaining freshness and controlling pests continues.

On the other hand, the direction of rotation of the fan is reversed so that 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.
Is set. As a result, the suctioned gas passes through the catalyst layer 3, and the unreacted surplus ozone is completely decomposed, so that no harm is caused to humans, animals, and the like. By controlling such operations and / or stopping the entire apparatus with a timer, an ozone sensor 9, or the like, ozone treatment such as deodorization, sterilization, freshness maintenance, and pest control can be easily performed easily. Also, the operation and / or the stopping of the device can be repeated. This automatic control can be performed by switching the air flow direction selection means of the fan 6 at predetermined intervals by a timer attached to the apparatus main body or based on the magnitude of the output of the ozone sensor.

FIG. 2 shows a processing apparatus 7B according to another embodiment of the present invention.
920 cm ³ ) One opening 1, inorganic catalyst layer 3 made of activated carbon honeycomb supporting 5 wt% potassium carbonate, reversible fan 6, ozone generator 4, acid for treating gas supplied to ozone generator Supported adsorbent layer 5 (H ₂ S
O ₄ -10 wt% carrying activated carbon honeycomb), and the other opening 2 is formed in this order. Reference numeral 10 denotes an air pump for supplying gas to the ozone generator.

In addition to the ON-OFF switch, the fan 6 is provided with a changeover switch (not shown) for changing the air blowing direction. Further, by selecting this changeover switch, the air blowing direction changes from right to left in the drawing. When this happens, an ozone generation amount adjusting means (not shown) comprising a switching control circuit for maximizing the output of the ozone generator (frequency: 11.76 KHz, voltage: 8.4 KVpp) is provided.

The drive and function of the processing device 7B will be described. First, by setting the rotation direction of the fan 6 so that the gas flows from the opening 1 to the opening 2, the ozone generator 4 is set so that the amount of generated ozone is minimized. The gaseous mixture is released from the opening 2, and a relatively low concentration of ozone diffuses into the space, and the ozone reacts with malodorous components, airborne bacteria, ethylene, etc. in the space, and the gaseous mixture is converted into a catalyst layer. By distributing to, it exhibits effects such as deodorization and sterilization freshness maintenance. Since the ozone concentration in this space is relatively low, the atmosphere is kept harmless to humans, animals, foods and the like.

On the other hand, the direction of rotation of the fan is reversed so that gas flows from the opening 2 to the opening 1, so that the amount of generated ozone is set to be maximum. By mixing with the fan 6 and uniformly flowing through the catalyst layer, malodorous components in the suction gas,
Oxidation and decomposition of airborne bacteria and ethylene with ozone, deodorization, sterilization,
The effect of maintaining freshness and the like is efficiently and stably exhibited, and ozone is almost completely decomposed in the catalyst layer to become a clean gas and exits from the opening 1 into the space.

This operation and / or the operation of stopping the apparatus and / or the operation of repeatedly stopping the apparatus can be controlled by the timer, the ozone sensor 9 and the like in the same manner as described above. Example 1 A volume of 100 m for disassembling fresh fish and meat and packing them in packs
Ozone generation capacity 1,000mg / H in the center of room ³
Ozone generator (capacity in air with dew point -72 ° C), B
Activated carbon honeycomb with an ET surface area of 1,200 m ² / g (300 cells / m ² , size 84 mm × 44 mm × 20 m
m) The ozone treatment apparatus of the present invention as shown in FIG. 4 equipped with 100 sheets was installed, and fish odor and meat odor experiments were performed.
The apparatus is provided with an air pump for passing gas at 20 l / min to the electrode of the ozone generator and two timers for proceeding the process. In the figure, 11 denotes an inorganic catalyst layer made of activated carbon honeycomb, 12 denotes a silent discharge type ozone generator, 13 denotes an air pump, 14 denotes an acid-carrying adsorbent layer, and 15 denotes a reversible fan.

When the switch of the apparatus main body is turned on, the first timer is turned on, the first step is performed, and when the set time of the first timer elapses, the first timer is turned off, and at the same time, the second timer is turned on. Two steps are performed,
When the set time of the second timer elapses, the second timer becomes O
It is designed so that it becomes an FF and the device body stops.

The relationship between the operation of the two timers and the process is as follows.

[0030]

[Table 1]

The following two experiments were conducted with the set times of the first timer and the second timer set to 5 hours and 2 hours, respectively. <Experiment-1> No pretreatment of gas passing through the electrode surface of the ozone generator (Comparative Example) After normal work in this room was completed, the room was almost closed, and the switch of the device body was turned ON. Operation started. Table 1 shows the results of an ozone monitor study of the ozone concentration near the center of the room.

Seven hours after the start of the experiment, the ozone concentration in the room was 0 ppm, and five monitors entered the room and performed a sensory test. Was. After the implementation, the electrodes of the ozone generator were washed with water and examined by ion chromatography. As a result, a considerable amount of nitrate ions was detected. That is,
Ammonia and trimethylamine (approximately 1.5 ppm in total) that existed in the room react with nitrogen oxides (mainly N ₂ O ₅ ) generated in the ozone generator, and nitrate on the electrode surface is formed. Crystals adhered, the generation of ozone was significantly suppressed, and deodorization with ozone was not successful. <Experiment-2> 4 to 6 mesh granular activated carbon having a BET surface area of 1500 m ² / g and 25% by weight of phosphoric acid impregnated with 1
A column having a diameter of 00 mm is filled with 800 ml to form an acid-supporting adsorbent layer, which is then subjected to pretreatment by flowing gas passing through an ozone generator (invention). One week after the above-mentioned experiment-1, an experiment was conducted in the same manner as experiment-1. Was done. Table 1 shows the changes over time in the ozone concentration in the room. Seven hours after the start of the experiment, the ozone concentration in the room was 0 ppm, and it was confirmed that all five monitors were well deodorized.

After the test, the electrode of the ozone generator was washed with water and examined by ion chromatography in the same manner as in Experiment 1, but no nitrate ion was detected. From Table 1, it can be seen that by pre-treating the gas passing through the ozone generator with the acid-carrying adsorbent layer, the ozone generation efficiency is always kept high, and the ozone deodorization efficiency is significantly improved.

[0034]

[Table 2]

Example 2 One room of an office having an internal volume of 25 m ³ (indoor temperature: 24.5)
° C), six cockroaches having a body length of about 8.5 mm were put in the chamber, and a silent discharge type ozone generator (ozone generation amount 50
0 mg / hr) and an ozone diffuser equipped with a fan (air volume: 2.1 m ³ / min) and 1.5 pp in a closed state.
m atmosphere of ozone (temperature: 25.8 ° C)
Circulation was performed at 26 m ³ / hr for 1 hour.

About 40 minutes after the start of ozone emission, the ozone concentration in the room reached 1.05 ppm and was almost in an equilibrium state (room temperature: 25.5 ° C.). Six hours after the end of the release of the ozone-containing gas, an activated carbon honeycomb having a cross-sectional area of 1,850 cm ² (number of cells: 300 / inch ² ; thickness: 2)
(0 mm), the room air was circulated at 2.1 m ³ / hr. 30 minutes after distribution, the concentration of ozone is 0.05 ppm
It became the following.

When the door of the room was opened and the room was observed,
Four were dead and lying on the floor, while the other two were quite weak.

[0038]

As described above, ozone has a strong oxidizing power, and is deodorized, sterilized,
It has a wide range of effects such as maintaining freshness and controlling pests. It is considered that the oxidation reaction of the main malodorous component by ozone is as follows.

H ₂ S → S, CH ₃ SH → CH ₃ SOSC
H ₃ ,

Embedded image (CH ₃ ) ₃ N → CH ₃ NO ₂ , NH ₃ → NH ₄ NO ₃ Sterilization by ozone is considered to be caused by ozone acting on cell walls or cell membranes of bacteria, and destroying or decomposing them.
Easier to process and less persistent than other germicidal gases. The preservation of the freshness of foods by ozone is based on the above-mentioned bactericidal action or on the oxidative decomposition of ethylene which promotes the mature aging of plants such as vegetables and fruits.

On the other hand, unreacted ozone is easily decomposed to oxygen on the surface of the catalyst (O ₃ → O ₂ ). According to the processing apparatus of the present invention, the generation and decomposition of ozone can be controlled by one apparatus according to the situation at the site or automatically. Therefore, the treatment of air with ozone according to the purpose, which is impossible with the conventional apparatus, can be performed accurately and simply, and the apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of a treatment apparatus using ozone according to the present invention mainly on the premise of sterilization, deodorization, and control of pests.

FIG. 2 is a configuration explanatory view showing one embodiment of a treatment apparatus using ozone mainly on the premise of deodorization, floating sterilization, and maintaining freshness.

FIG. 3 is a schematic diagram showing a relationship between a space to be subjected to ozone treatment and an ozone treatment device.

FIG. 4 is a configuration explanatory view showing an ozone treatment apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 1, 2 opening 3, 11 inorganic catalyst layer 4, 12 ozone generator 5, 14 acid-carrying adsorbent layer 6, 15 fan 7 ozone treatment device 8 space to be ozone treated 9 ozone sensor 10, 13 air pump

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-47261 (JP, A) JP-A-3-143526 (JP, A) JP-A-2-193672 (JP, A) JP-A-63-1988 214262 (JP, A) JP-A-63-317155 (JP, A) JP-A-54-119371 (JP, A) JP-A-62-57557 (JP, A) JP-A-63-59961 (JP, A) Japanese Utility Model Application No. 64-32728 (JP, U) Japanese Utility Model Application No. 63-197547 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61L 9/015 B01D 53/38 B01D 53/66 B01D 53/74

Claims (6)

(57) [Claims] 1. An apparatus main body is provided with two openings for forming a gas flow path, a blowing means, a silent discharge type ozone generator, and an inorganic material capable of adsorbing or decomposing at least ozone in the gas flow path. A system catalyst layer and an acid-carrying adsorbent layer for gas pretreatment supplied to the ozone generator are arranged, and the blowing means includes one or more fans for blowing in both forward and reverse directions, and blowing direction selecting means. Wherein the ozone generator is provided with adjusting means for adjusting the amount of ozone generated in conjunction with the blowing direction selecting means. 2. The adjusting means sets the amount of ozone generated by the ozone generator to the maximum side when the air blowing in the forward (or reverse) direction is selected by the air blowing direction selecting means, while the air blowing direction selecting means sets the amount of ozone generated in the reverse direction. The apparatus according to claim 1, wherein the ozone generation amount of the ozone generator is set to a decreasing side or a stopping side when air blowing in the (or forward) direction is selected. 3. The apparatus according to claim 1, wherein a timer is provided in the apparatus main body, and the blowing direction selecting means is linked to the timer. 4. The apparatus of claim 1, wherein the fan comprises one reversible fan. 5. The apparatus according to claim 1, wherein the fan comprises two fans, each of which is arranged so as to be able to blow air in both forward and reverse directions. 6. A gas to be supplied to an electrode of the ozone generator when the blower in the reverse (or forward) direction is selected by the blower direction selecting means and the amount of ozone generated by the ozone generator is set to a stop side. 3. The apparatus according to claim 2, wherein the apparatus is controlled to purge the inside of the electrode.