阅读说明：本技术 除污染装置和系统 (Decontamination device and system ) 是由 池田卓司 茂田诚 于 2020-02-26 设计创作，主要内容包括：本发明的一个方面的除污染装置对用于除去微粒的空气过滤器进行除污染处理。该除污染装置构成为,以使包含过氧乙酸的气体到达空气过滤器的方式释放气体,而不释放包含过氧乙酸的雾。本发明的另一方面的系统包括容器和除污染装置。容器构成为保持用于除去微粒的空气过滤器。除污染装置构成为,以使包含过氧乙酸的气体到达空气过滤器的方式将气体释放到容器内,而不释放包含过氧乙酸的雾。(The decontamination apparatus according to one aspect of the present invention decontaminates an air filter for removing particulates. The decontamination device is configured to release the gas containing peracetic acid so that the gas reaches the air filter without releasing mist containing peracetic acid. A system of another aspect of the invention includes a container and a decontamination apparatus. The container is configured to hold an air filter for removing particulates. The decontamination device is configured to release gas containing peracetic acid into the container so that the gas reaches the air filter without releasing mist containing peracetic acid.)

1. A decontamination device capable of decontaminating an air filter for removing particulates, the decontamination device characterized by:

releasing the gas comprising peracetic acid in such a way that the gas reaches the air filter without releasing a mist comprising peracetic acid.

2. A decontamination device as claimed in claim 1, wherein:

the gas is generated without heating the agent comprising peroxyacetic acid.

3. A decontamination device as claimed in claim 1 or 2, wherein:

the contamination removing device includes a porous member into which a chemical liquid containing peracetic acid is immersed.

4. A decontamination device as claimed in claim 3, wherein:

further comprising:

a casing having a fluid flow path formed therein and an opening formed on a downstream side thereof; and

a fan disposed on the flow path,

the porous member is disposed in the flow path.

5. A decontamination device as claimed in claim 1 or 2, wherein:

the decontamination device comprises:

a container for containing a chemical solution containing peracetic acid; and

a blower for blowing the gas generated by the evaporation of the peracetic acid contained in the container,

the air blown by the fan reaches the air filter.

6. A decontamination device as claimed in claim 1, comprising:

a casing having a fluid flow path formed therein and an opening formed on a downstream side thereof;

a mist generator, disposed on the flow path, capable of generating a mist comprising peroxyacetic acid;

a mist adsorption filter which is disposed on the flow path downstream of the mist generator and is capable of adsorbing the mist; and

a fan disposed on the flow path.

7. A system, comprising:

a container capable of holding an air filter for removing particulates; and

a decontamination device that releases a gas comprising peracetic acid into the container in such a manner that the gas reaches the air filter, without releasing a mist comprising peracetic acid into the container.

Technical Field

The invention relates to a pollution removal device and system.

Background

Japanese patent laid-open publication No. 2016-22144 (patent document 1) discloses a decontamination apparatus for decontaminating a biological safety cabinet. The pollution removing device atomizes the peroxyacetic acid bactericide to gasify the peroxyacetic acid bactericide, so that the gasified peroxyacetic acid circulates in the biological safety cabinet. In this way, a High Efficiency Particulate Air (HEPA) filter disposed in the biosafety cabinet is subjected to a decontamination process (see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-22144

Disclosure of Invention

Problems to be solved by the invention

However, in the decontamination apparatus disclosed in patent document 1, since the peracetic acid disinfectant is atomized at once, there is a possibility that not only gaseous peracetic acid but also atomized peracetic acid circulates in the biosafety cabinet due to the influence of the temperature and humidity in the biosafety cabinet. When nebulized peracetic acid is circulated, for example, an air filter (e.g., a HEPA filter) disposed within the biosafety cabinet for removing particulates can be wetted. When the air filter for removing fine particles is wetted and moisture is absorbed by the dust collected by the air filter for removing fine particles, the dust may be fixed in a state of being opened between fibers and being formed into a film when the air filter is dried. As a result, the pressure loss of the air filter may rise.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a decontamination apparatus and a decontamination system that can suppress wetting of an air filter for removing particulates during decontamination processing of the air filter using peracetic acid.

Means for solving the problems

A decontamination apparatus according to one aspect of the present invention is configured to perform decontamination processing on an air filter for removing fine particles (particles, grains). The decontamination device is configured to release the gas containing peracetic acid so that the gas reaches the air filter without releasing mist containing peracetic acid.

According to the decontamination apparatus, the gas containing peracetic acid is released to the air filter without releasing mist, and therefore the possibility of wetting the air filter can be reduced as compared with the case of releasing mist containing peracetic acid. That is, according to the decontamination apparatus, since the air filter is less likely to be wetted, the possibility of the pressure loss of the air filter being increased due to the dust collected by the air filter for removing particulates being fixed in a state of a stretched film between fibers can be reduced.

In the above-described decontamination apparatus, the gas may be generated without heating the chemical containing peracetic acid.

According to the decontamination apparatus, since the chemical containing peracetic acid is not heated, decomposition of peracetic acid can be suppressed. Further, according to the decontamination apparatus, since the temperature of the chemical agent containing peracetic acid is maintained at the same level as the temperature in the space in which the air filter to be decontaminated is disposed, the possibility of condensation in the space can be suppressed.

The above-mentioned decontamination apparatus may include a peracetic acid gas generation part configured to receive a chemical solution containing peracetic acid, wherein the chemical solution has a surface area of 20cm when the chemical solution is received in the peracetic acid gas generation part²The above.

The contamination removing device can generate peracetic acid gas from a chemical liquid containing peracetic acid. The method for producing peroxyacetic acid gas may be a method in which a chemical liquid is put into a container having a sufficiently wide opening to produce peroxyacetic acid gas. The peroxyacetic acid gas may be diffused naturally, or may be blown by a blower, for example, may be diffused by air by a blower provided in a closed container.

The contamination removing device may have a porous member into which a chemical solution containing peracetic acid is immersed.

The contamination removing device may generate gas from a porous member into which a chemical containing peracetic acid is impregnated. The peroxyacetic acid gas may be diffused naturally, or may be blown by a blower, for example, may be diffused by air by a blower installed in a closed container.

The above-mentioned decontamination device may further include: a casing having a fluid flow path formed therein and an opening formed on a downstream side thereof; and a fan disposed on the flow path, wherein the porous member is disposed on the flow path.

In this decontamination apparatus, a fan blows air to a porous member containing a chemical, thereby releasing gas containing peracetic acid from the porous member to an opening. Therefore, according to the decontamination apparatus, the gas containing peracetic acid is released to the air filter, and thus the possibility of the air filter being wetted can be reduced as compared with the case where the mist containing peracetic acid is released.

The above-mentioned decontamination device may also include: a container that contains a chemical solution containing peracetic acid; and a fan configured to blow air generated by evaporation of the peracetic acid contained in the container, the air having been blown by the fan reaching the air filter.

In the decontamination apparatus, a fan blows air to a gas containing peracetic acid, thereby releasing the gas. Therefore, according to the decontamination apparatus, the gas containing peracetic acid is released to the air filter, and thus the possibility of the air filter being wetted can be reduced as compared with the case where the mist containing peracetic acid is released.

The above-mentioned decontamination device may also include: a casing having a fluid flow path formed therein and an opening formed on a downstream side thereof; a mist generator disposed on the flow path and capable of generating a mist containing peracetic acid; a mist adsorption filter which is disposed on the downstream side of the mist generator on the flow path and can adsorb the mist; and the fan is configured on the flow path.

In this decontamination apparatus, mist generated in the mist generator is removed by the mist removal filter, and a gas containing peracetic acid is released from the opening. Therefore, according to the decontamination apparatus, the gas containing peracetic acid is released to the air filter, and thus the possibility of wetting the air filter can be reduced as compared with the case where the mist containing peracetic acid is released to the air filter.

A system according to another aspect of the invention includes a container and a decontamination apparatus. The container is configured to hold an air filter for removing particulates. The decontamination device is configured to release the gas containing peracetic acid into the container so that the gas reaches the air filter, without releasing the mist containing peracetic acid into the container.

According to this system, since the gas containing peracetic acid is discharged to the air filter in the container by the decontamination device, the possibility of wetting the air filter can be reduced as compared with the case where mist containing peracetic acid is discharged.

Effects of the invention

According to the present invention, it is possible to provide a decontamination apparatus capable of suppressing wetting of a fibrous air filter during decontamination of the air filter by peracetic acid.

Drawings

Fig. 1 is a diagram for explaining an outline of the system.

Fig. 2 is a schematic view showing the front surface of the decontamination apparatus according to embodiment 1.

Fig. 3 is a schematic view showing a section III-III of fig. 2.

FIG. 4 is a view showing a state of the system at the time of the decontamination treatment.

Fig. 5 is a flowchart showing a flow of the decontamination process in the system.

Fig. 6 is a schematic view showing the front surface of the contamination removal device according to embodiment 2.

Fig. 7 is a schematic view showing a section VII-VII of fig. 6.

Fig. 8 is a diagram showing a schematic configuration of a decontamination apparatus according to embodiment 3.

FIG. 9 is a schematic diagram showing the experimental apparatus in experiment 1.

FIG. 10 is a schematic diagram showing an experimental apparatus in experiment 2.

Fig. 11 is a schematic diagram showing an experimental environment in experiment 3.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.

[1, embodiment 1]

(1-1. overview of the System)

Fig. 1 is a diagram for explaining an outline of a system 10 according to the present embodiment. As shown in fig. 1, the system 10 includes a safety cabinet 100 and a decontamination apparatus 200.

The safety cabinet 100 is a box-shaped experimental apparatus for suppressing biohazard. The experimenter inserts his or her hand into the working space S1 and performs an experiment using, for example, a biomaterial. In the safety cabinet 100, the working space S1 is maintained at a negative pressure. That is, in the safety cabinet 100, for example, the diffusion of the biomaterial disposed in the working space S1 to the experimenter side is suppressed.

The safety cabinet 100 includes a fan 110, hepa (high Efficiency Particulate air) filters 120, 130, and a shutter 140. In the experiment, an air flow is generated due to the operation of the fan 110, the clean air is discharged to the outside through the HEPA filter 120, and the clean air is supplied to the working space S1 through the HEPA filter 130. The shutter 140 is configured to be openable and closable.

The decontamination apparatus 200 is an apparatus for decontaminating (biologically decontaminating) the HEPA filters 120 and 130 disposed in the safety cabinet 100 after the safety cabinet 100 is used. For example, the decontamination apparatus 200 is disposed in the work space S1 after the safety cabinet 100 is used. The decontamination apparatus 200 is configured to perform decontamination of the HEPA filters 120 and 130 by discharging gaseous peracetic acid into the working space S1. Next, the reason why the contamination removal device 200 releases gaseous peracetic acid for performing the contamination removal treatment of the HEPA filters 120 and 130 will be described.

When the misty peracetic acid is released by the decontamination apparatus 200, the HEPA filters 120, 130 may become wetted, depending on the humidity within the safety cabinet 100. If the HEPA filters 120 and 130 are wet and the dust collected by the fibrous HEPA filters 120 and 130 absorbs moisture, the dust may be solidified in a state where the membrane is opened between the fibers when the HEPA filters 120 and 130 are dried. As a result, the pressure loss of the HEPA filters 120 and 130 may increase. If the pressure loss increases, for example, the HEPA filters 120 and 130 may be broken.

Therefore, in the system 10, only gaseous peracetic acid is discharged into the working space S1 by the decontamination apparatus 200, and the HEPA filters 120 and 130 are decontaminated. According to the decontamination apparatus 200, since only the gas containing peracetic acid is discharged to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where mist containing peracetic acid is discharged. That is, according to the contamination removal device 200, since the HEPA filters 120 and 130 are less likely to be wetted, the possibility that the dust collected by the fibrous HEPA filters 120 and 130 is solidified in a state of a spread film between the fibers and the pressure loss of the HEPA filters 120 and 130 is increased can be reduced.

Hereinafter, the configuration of the decontamination apparatus 200 will be described in detail, and then, the flow of decontamination processing in the safety cabinet 100 will be described.

(1-2. structure of decontamination plant)

Fig. 2 is a schematic view showing the front of the decontamination apparatus 200. Fig. 3 is a schematic view showing a section III-III of fig. 2. As shown in fig. 2 and 3, the pollution removing device 200 includes a housing 210, a tray 220, a porous member 230, and a fan 240.

The housing 210 has a quadrangular prism shape in which a cavity (a fluid flow path) is formed. The housing 210 is made of, for example, resin or metal. An opening O1 is formed in the front surface of the case 210, and an opening O2 is formed in the rear surface of the case 210. The tray 220, the porous member 230, and the fan 240 are disposed in a flow path formed in the casing 210.

The tray 220 is configured to store a liquid chemical containing peracetic acid (hereinafter, also referred to as a "peroxyacetic acid-based decontamination agent").

The porous member 230 may be wetted with a liquid chemical (drug solution) containing peracetic acid. In the present embodiment, the porous member 230 is disposed in the tray 220 that contains the chemical solution, so that the porous member 230 is wetted with the chemical solution. The method of wetting the porous member 230 is not limited to this, and for example, the porous member 230 may be wetted with a chemical liquid by applying the chemical liquid from above the porous member 230.

The porous member 230 is not particularly limited in structure or member as long as it can be wetted with a liquid chemical containing peracetic acid and efficiently vaporizes the chemical by ventilation. For example, the porous member 230 may be formed by processing a sheet-like member such as a woven fabric, a knitted fabric, a nonwoven fabric, or a film into a corrugated shape or a corrugated shape. The porous material such as diatomaceous earth or zeolite may be contained in a woven fabric, a knitted fabric, a nonwoven fabric, a film, or the like. The porous member 230 is disposed in the tray 220. The porous member 230 sucks up the peracetic acid type decontaminant in the tray 220 by capillary action. That is, the porous member 230 is impregnated with a peroxyacetic acid-based stain removing agent.

The fan 240 is configured to generate wind from the upstream side to the downstream side. As the fan 240, various known fans (blowers) can be used. The fan 240 is disposed upstream of the porous member 230. That is, when the fan 240 is operated, wind is generated toward the porous member 230, and only the gas containing peracetic acid is released from the porous member 230 to the opening O1.

(1-3. decontamination process)

Fig. 4 is a diagram showing a state of the system 10 at the time of the decontamination process. As shown in fig. 4, in the decontamination process of the system 10, the inside of the safety cabinet 100 is closed or quasi-closed by the shutter members 141 and 142. This can prevent the peracetic acid gas from leaking to the outside of the safety cabinet 100, and can increase the gas concentration in the safety cabinet 100. In addition, it is found through experiments that even if the sealing is performed by the blocking member 141, the concentration of the peracetic acid gas above the HEPA filter 120 is sufficiently increased during decontamination.

Fig. 5 is a flowchart showing a flow of the decontamination process in the system 10. The processing shown in this flowchart is executed by the experimenter, for example, after the use of the safety cabinet 100 is completed.

Referring to fig. 5, the experimenter arranges the decontamination apparatus 200 in the working space S1 of the safety cabinet 100 (step S100). The experimenter operates the decontamination apparatus 200 to start decontamination of the HEPA filters 120 and 130 by the decontamination apparatus 200 (step S110). The decontamination process performed by the decontamination apparatus 200 may be automatically started by setting a timer or a decontamination program, or may be started by operating a switch attached to the decontamination apparatus main body or a switch provided outside the work space S1.

The experimenter determines whether the decontamination process is completed (step S120), and if it is determined that the decontamination process is completed (YES in step S120), the experimenter takes out the decontamination apparatus 200 from the work space S1 to complete the process.

(1-4. characteristics)

As described above, according to the decontamination apparatus 200, since the gas containing only peracetic acid is discharged to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where mist containing peracetic acid is discharged. That is, according to the decontamination apparatus 200, since the HEPA filters 120 and 130 are less likely to be wetted, the possibility that the dust collected by the fibrous HEPA filters 120 and 130 is solidified in a state of a spread film between the fibers and the pressure loss of the HEPA filters 120 and 130 is increased can be reduced.

In particular, in the decontamination apparatus 200, the fan 240 blows air to the porous member 230, and only the gas containing peracetic acid is released from the porous member 230 to the opening O1. Thus, according to the decontamination apparatus 200, since the gas containing only peracetic acid is released to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where mist containing peracetic acid is released.

[2. embodiment 2]

In embodiment 1, gaseous peroxyacetic acid is discharged by the decontamination apparatus 200. In embodiment 2, gaseous peroxyacetic acid is discharged by the decontamination apparatus 200A. The following description focuses on differences from embodiment 1.

(2-1. structure of decontamination plant)

Fig. 6 is a schematic view showing the front surface of the decontamination apparatus 200A. Fig. 7 is a schematic view showing a section VII-VII of fig. 6. As shown in fig. 6 and 7, the decontamination apparatus 200A includes a housing 210A, a fan 240A, a mist generating device 250A, and a mist adsorption filter 260A.

The case 210A has a quadrangular prism shape in which a cavity (a fluid flow path) is formed. The case 210A is made of, for example, resin or metal. An opening O1A is formed in the front surface of the case 210A, and an opening O2A is formed in the rear surface of the case 210A. The fan 240A, the mist generator 250A, and the mist adsorption filter 260A are disposed in a flow path formed in the housing 210A.

The fan 240A is configured to generate wind from the upstream side to the downstream side. As the fan 240A, various known fans (blowers) can be used.

The mist generating device 250A is configured to generate peracetic acid in a mist form using a peracetic acid-based stain remover. As the mist generation method, for example, there are an ultrasonic atomization method and a spray method, and any of these methods can be used. The mist generating device 250A is disposed downstream of the fan 240A. That is, when the fan 240A and the mist generating device 250A are operated, the mist of peracetic acid generated by the mist generating device 250A goes toward the mist adsorption filter 260A side with the wind.

The mist adsorbing filter 260A is disposed downstream of the mist generating device 250A, and is configured to adsorb the mist generated by the mist generating device 250A. That is, in the pollution abatement device 200A, the mist generated in the mist generation device 250A is adsorbed and vaporized by the mist adsorption filter 260A, and the gas containing only peracetic acid is released from the opening O1A.

(2-2. characteristics)

As described above, according to the decontamination apparatus 200A, since the gas containing only peracetic acid is released to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where mist containing peracetic acid is released. That is, according to the contamination removal device 200A, the possibility that the HEPA filters 120 and 130 are wetted is reduced, and thus the possibility that the dust collected by the HEPA filters 120 and 130 for removing fine particles is solidified in a state of a spread film between fibers and the pressure loss of the HEPA filters 120 and 130 is increased can be reduced.

In particular, in the pollution abatement device 200A, the mist generated in the mist generation device 250A is removed by the mist adsorption filter 260A, and the gas containing only peracetic acid is released from the opening O1A. Thus, according to the decontamination apparatus 200A, since the gas containing only peracetic acid is discharged to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where the mist containing peracetic acid is discharged to the HEPA filters 120 and 130.

The mist adsorption filter 260A is more preferably capable of adsorbing mist and vaporizing the adsorbed mist. The mist adsorption filter 260A has a structure in which a sheet-like member such as a woven fabric, a knitted fabric, or a nonwoven fabric is formed into a pleated shape, for example. As the material of the mist adsorption filter 260A, glass, resin, cellulose, and the like are available, but resin and cellulose having high strength and high cracking resistance are preferable. Examples of the performance of the mist adsorption filter 260A include an ULPA (Ultra Low Penetration Air) filter, a HEPA filter, and a neutral filter, but the neutral filter is more preferable in consideration of the initial pressure loss and the increase in pressure loss due to mist adhesion.

In addition, in the case of using the ultrasonic method as the mist generation method, since the contamination removing agent is atomized by vibration of the vibrator, the contamination removing agent is heated by the vibrator. If the depolluting agent is heated, the decomposition of the peroxyacetic acid is promoted. Further, if the decontamination agent is heated, the temperature in the safety cabinet 100 rises, and the difference between the room temperature and the temperature in the safety cabinet 100 becomes large, which causes dew condensation.

[3. embodiment 3]

In embodiments 1 and 2, gaseous peroxyacetic acid is released by the decontamination apparatuses 200 and 200A, respectively. In embodiment 3, gaseous peroxyacetic acid is discharged by the decontamination apparatus 200B. The following description will focus on differences from embodiments 1 and 2.

(3-1. structure of decontamination plant)

Fig. 8 is a schematic configuration diagram of a decontamination apparatus 200B according to embodiment 3. As shown in fig. 8, the decontamination apparatus 200B includes a housing 210B and a fan 240B.

The case 210B is made of a material such as metal or resin that is not corroded by the decontamination agent, and is configured to house the decontamination agent 112. The decontamination agent is an aqueous solution comprising peroxyacetic acid. A fan 240B is provided above the housing 210B.

The fan 240B is configured to generate an airflow from the outside of the housing 210B to the inside and an airflow from the inside of the housing 210B to the outside by rotation. The peracetic acid gas generated by evaporation of the depolluting agent is discharged to the outside of the housing 210B by the rotation of the fan 240B. In the decontamination apparatus 200B, only peracetic acid gas generated by evaporation of the decontamination agent is released to the outside of the housing 210B, and therefore mist containing peracetic acid is not released.

(3-2. characteristics)

As described above, according to the decontamination apparatus 200B, since the gas containing only peracetic acid is released to the HEPA filters 120 and 130, the possibility of wetting the HEPA filters 120 and 130 can be reduced as compared with the case where mist containing peracetic acid is released. That is, according to the contamination removal device 200A, the possibility that the HEPA filters 120 and 130 are wetted is reduced, and thus the possibility that the dust collected by the HEPA filters 120 and 130 for removing fine particles is solidified in a state of a spread film between fibers and the pressure loss of the HEPA filters 120 and 130 is increased can be reduced.

In particular, in the decontamination apparatus 200B, the peracetic acid gas can be released without heating the decontamination agent. Thus, according to the decontamination apparatus 200B, the possibility of condensation in the safety cabinet 100 can be reduced without increasing the difference between the temperature in the safety cabinet 100 and the room temperature due to the heating of the decontamination agent.

[4. modification ]

Embodiments 1 to 3 have been described above, but the present invention is not limited to the above embodiments 1 to 3, and various modifications can be made without departing from the spirit thereof. The following describes modifications. The following modifications can be combined as appropriate.

(4-1)

In embodiments 1 to 3, the air filters to be decontaminated are HEPA filters 120 and 130. However, the air filter for removing the contamination target is not limited thereto. The air filter for removing the contamination target may be, for example, a neutral performance filter or an ULPA filter.

(4-2)

In embodiments 1 to 3, the container holding the air filter to be decontaminated is the safety cabinet 100. However, the container holding the air filter for removing the contamination object is not limited thereto. For example, the container holding the air filter to be decontaminated may be any container as long as the container can accommodate the air filter to be decontaminated. Further, the container holding the air filter to be decontaminated may be sealed or may be in a quasi-sealed state. That is, the degree of sealing of the container may be set to such an extent that the concentration of the peracetic acid gas does not extremely decrease due to leakage of the peracetic acid gas. For example, the container may be an isolator device, an incubator, a centrifuge, a transfer box, a storage, an air conditioner, a pipeline, or the like.

(4-3)

In embodiments 1 to 3, it is preferable that the peroxyacetic acid-based stain removing agent is not heated. Further, it is preferable that the peroxyacetic acid-based decontamination agent does not contact the heating element. In the mode in which the peroxyacetic acid based depolluting agent is not heated, since the amount of gas generated is significantly reduced when the temperature of the depolluting environment is low, the temperature of the depolluting environment is preferably 10 ℃ or higher, and more preferably 15 ℃ or higher. When the temperature is maintained, it is preferable to maintain the temperature in the container subjected to the decontamination treatment at substantially the same level as the temperature in the space (room or the like) in which the container is disposed. On the other hand, it is known that when the peroxyacetic acid-based stain removing agent is heated to 40 ℃ or higher, decomposition of peroxyacetic acid is promoted. That is, decomposition of peracetic acid can be suppressed by maintaining the peracetic acid type depolluting agent at less than 40 ℃. Further, by maintaining the temperature of the peroxyacetic acid based stain remover at about room temperature, the possibility of condensation in the vicinity of the chemical can be suppressed.

(4-4)

In embodiments 1 and 2, the pollution control devices 200 and 200A may be configured to stop the release of the gaseous peroxyacetic acid when the humidity in the safety cabinet 100 reaches a predetermined value. That is, the decontamination apparatus 200, 200A may be configured to determine whether gaseous peroxyacetic acid is released or not based on an output of a humidity sensor that detects humidity in the safety cabinet 100. The predetermined value is, for example, RH 95% or less.

(4-5)

In embodiment 2, the contamination removal device 200A includes the HEPA filter 260A. However, the contamination removal device 200A may also have a neutral performance filter or ULPA filter, for example, instead of the HEPA filter 260A. The material of these filters may be any of glass, chemical fiber, cellulose, and the like.

[5. experiment ]

In order to confirm the effect of the present invention, the following experiment was performed. The following describes the contents and results of the experiment.

(5-1. experiment 1)

FIG. 9 is a schematic diagram showing the experimental apparatus in experiment 1. Referring to fig. 9, a HEPA filter of 305mm side 1 was provided in a duct of 275mm opening. About 50mm in inner diameter (about 20cm in area)²) About 10ml of Actril (Peroxyacetic acid-based disinfectant, Iodobenzonitrile) manufactured by Mar Cor purification was added to the petri dish, and the culture dish was placed on a net placed above the HEPA filter, and the number of the bacterial species G.stearothermophilus was 10 placed below the HEPA filter⁶BI (Biological Indicator). After leaving in this state for 12 hours, the BI is recovered. Culturing the recovered BI and confirming the extinction of the BI. Since the completion of decontamination can be confirmed by the extinction of BI, the HEPA filter is presumedDecontamination of (2) has also been accomplished. In experiment 1, it was confirmed that the HEPA filter can be decontaminated with gaseous peracetic acid.

(5-2. experiment 2)

FIG. 10 is a schematic diagram showing an experimental apparatus in experiment 2. Referring to fig. 10, a duct for housing the HEPA filter and the fan, a pressure loss meter for measuring a pressure loss of the HEPA filter, and a pollution removal device are disposed in the quasi-hermetic container. In the case where the contamination removing device releases the peracetic acid in a mist form, the pressure loss of the HEPA filter rises sharply. On the other hand, in the case where the decontamination apparatus releases peracetic acid in a gaseous state, the pressure of the HEPA filter does not rise sharply (only several pascals rises as the humidity rises). It was confirmed by the experiment 2 that the increase in the pressure loss of the HEPA filter to be decontaminated was suppressed by releasing gaseous peracetic acid by the decontamination apparatus.

(5-3. experiment 3)

Fig. 11 is a schematic diagram showing an experimental environment in experiment 3. As shown in fig. 11, in experiment 3, a contamination removal apparatus 200B was used. As a stain remover, 1L of Minncare 10% dilution was used. Inside the safety cabinet 100 and above the HEPA filter 120, 3 BIs are disposed, respectively. As BI, HMV-091 (bacteria count 10) from MesaLabs was used⁶). In the decontamination process, the fan 110 in the safety cabinet 100 is repeatedly operated for 5 minutes and stopped for 15 minutes while the fan 240B of the decontamination apparatus 200B is constantly operated. The decontamination time was 5 hours from the start of decontamination. Culturing the recovered BI and confirming extinction of all BI. Since the BI is extinguished and it can be confirmed that the decontamination is completed, it is assumed that the decontamination of the HEPA filters 120 and 130 is also completed.

Description of the reference numerals

10, a system; 100 a safety cabinet; 110. 240, 240A, 240B fans (blowers); 120. a 130HEPA filter; 260A fog adsorption filter; 140 a shutter; 141. 142 a shutter member; 200. 200A, 200B decontamination devices; 210. 210A, 210B housings; 220 a tray; 230 a porous member; a 250A mist generating device (mist generator); openings of O1, O2, O1A and O2A; s1 work space.