JP2004305904A - Dioxins removing method, incinerator dismantling method, and asbestos removing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for removing dioxins or asbestos and for dismantling an incinerator, which make it possible to remove the dioxins or asbestos without producing other waste materials and to improve work efficiency. <P>SOLUTION: According to the method, in an isolation process, a dioxins attaching source or an asbestos dusting source is isolated and the inside of the incinerator enclosed airtightly by isolation is kept under negative pressure using a dust collector. In a wetting process, a wetting agent is sprayed on a part with an attachment of the dioxins or asbestos to wet the dioxins or asbestos. In a removing process, blasts of sublimable particles, such as dry ice, are sent to the part to peel off the attached matter. Then, in a removed material treating process, the removed dioxin-containing material or asbestos is recovered and is solidified by spraying a solidification agent on the removed material or asbestos. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for removing dioxins, a method for dismantling an incinerator using the same, and a method for removing asbestos.
[0002]
[Prior art]
In general incinerators, dioxins may be generated depending on the type of substance to be incinerated, and at the same time, incineration ash containing dioxins may adhere to the inside of this kind of incinerator. It is already known. Therefore, when dismantling and removing this type of incineration facility, it has been necessary to remove incineration ash and the like adhering to the incinerator and treat it as a harmful substance. However, when incineration ash and the like are peeled off in a state where the inside of the incinerator is dried, dioxins are easily scattered. Therefore, conventionally, in order to prevent drying of a portion where the incineration ash or the like adheres, a method of removing the incineration ash or the like exclusively using high-pressure water has been adopted. And when peeling by high-pressure water as described above, since contaminated water containing dioxins is generated, it is necessary to prevent the contaminated water from being absorbed into the ground, and before the peeling operation, There was a need for a process of preventing contaminated water from flowing out, such as placing concrete on the surface of the ground, and a process of collecting and contaminating the contaminated water, and performing a coagulation sedimentation process after the stripping operation.
[0003]
On the other hand, asbestos is known to be used on the wall or ceiling as fireproof material, heat insulating material or soundproofing material in buildings, but in the dismantling of the above-mentioned buildings and construction to remove sprayed asbestos, etc. Since asbestos is easily scattered to the surroundings, work has been performed in an environment in which a considerable area including the wall surface or the ceiling is previously surrounded. And, as a method of removing asbestos under the environment as described above, the asbestos is wetted by spraying an anti-scattering treatment agent in advance, and the worker peels off the wall portion or the ceiling portion using an instrument or the like, The exfoliated asbestos is treated by a method of solidifying and then carried out.
[0004]
[Patent Document 1] JP-A-2002-257320 (page 3-4, FIG. 3)
[0005]
[Problems to be solved by the invention]
However, in the method of removing dioxins in an incinerator using high-pressure water, as described above, in order to prevent the contaminated water generated by the high-pressure water jet from penetrating into the soil, etc. A process and a recovery process after the operation are required, and the process is large-scale and long-term. As a result, the time and cost required for dismantling and removing the entire incineration facility must be enormous.
[0006]
In addition, in order to collect dioxins removed by high-pressure water, all contaminated water, which is the wastewater used in high-pressure water jets, must be collected and treated legally as hazardous waste. This has led to an increase in the amount of waste. Therefore, it is possible to adopt a method of removing harmful substances in the incinerator by blasting using silica sand, but it is necessary to treat blast materials such as contaminated silica sand as industrial waste. Therefore, in order to reduce the occurrence of these, further measures are required, and a method of removing extraneous matter by adding a step of separating silica sand and the like from incineration ash has been developed at present (see Patent Reference 1).
[0007]
On the other hand, in the method of removing asbestos, since the above-mentioned instruments and the like are used, manual work has to be performed, which increases the burden on the worker and lengthens the working time. . In addition, since asbestos dust is easily scattered, it is necessary to work in the space surrounding the source of asbestos.・ Even if a gas mask is worn, it is not preferable to work continuously for a long time in the above environment if the health of the worker is taken into consideration, resulting in poor work efficiency. Was.
[0008]
The present invention has been made in view of the above points, and has as its object to remove dioxins or asbestos without generating other waste and improve the working efficiency. And a method for dismantling an incinerator.
[0009]
[Means for Solving the Problems]
Therefore, the present invention according to the method for removing dioxins, the step of isolating the source of dioxins, the step of wetting the source of dioxins, the step of removing dioxins by blasting sublimable particles, and sealing or removing the removed dioxins. A method for removing dioxins, comprising a treatment step by solidification.
[0010]
Further, in the present invention according to the incinerator dismantling method, the incinerator decomposition step, the incinerator isolation step, the incinerator internal wetting step, the dioxin-containing deposit removal step by blasting sublimable particles And a treatment step for sealing or solidifying the removed dioxin-containing deposits, and a step of spraying a solidifying agent on the inner surface of the incinerator.
[0011]
Further, in the present invention according to the asbestos removal method, the step of isolating the asbestos dust generation source, the step of spraying the scattering inhibitor to the asbestos dust generation source, the step of removing the asbestos by blasting the sublimable particles, and the prevention of dust scattering on the asbestos removal surface The gist of the present invention is to provide a method for removing asbestos, comprising a step of spraying a treating agent and a step of sealing or solidifying the removed asbestos.
[0012]
In each of the above inventions, the separating step is performed by using a dust collecting device that encloses a dioxin adhesion source or an asbestos dust generation source with an airtight sheet material while enclosing the enclosing source, and sucks air in the enclosing zone. It can be a negative pressure isolation step in which the inside of the sealed section is negative pressure. In addition, the blast of the sublimable particles blasts dry ice particles, and as the dry ice particles, dry ice particles formed in a cylindrical shape having a diameter of 2.5 mm to 3.0 mm and a length of 5 mm to 10 mm. Use
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an embodiment of the invention relating to a method of dismantling an incinerator includes an incinerator isolation step 1, an incinerator disassembly step 2 for disassembling the incinerator into a main body and a chimney, etc., and an incinerator main body and a chimney Wetting step 3 for adhering matter adhering to the inner surface of the material, etc., removing step 4 of the adhering matter, processing step 5 of the removed substance generated by this removing step, and the inside of an incinerator etc. And a step 6 for spraying a solidifying agent on the surface.
[0014]
The incinerator isolation step 1 encloses the entire incinerator to be dismantled and isolates it from the surroundings, and uses an airtight sheet material such as a vinyl sheet for this enclosure. When enclosing a wide area, a plurality of sheet materials will be used, but the seam of each sheet material is tightly joined, and the enclosed area is hermetically sealed so that the air inside does not leak. is there. At this time, a similar sheet material is laid on the ground surface to isolate the space from the ground surface and to be integrally sealed with other sheet materials. By providing the sheet material on the ground surface, it is possible to prevent the removed dioxins from penetrating or mixing into the ground, and completely surround the incinerator, thereby completely shutting off the outside from the outside.
[0015]
The isolation step 1 can be a negative pressure isolation step. That is, a dust collecting device for sucking the inside air divided as described above is provided, and the suction of the inside air maintains a negative pressure state as compared with the outside. As a result, a negative pressure isolation state in which external air can flow in but does not allow internal air to flow out can be achieved. This dust collecting device has a dust collecting capability of exchanging the internal air four times or more per hour. A dust filter and a gas proof filter are installed in the exhaust path of the dust collecting device, and the dust is sucked. Prevents dust and harmful substances from leaking or scattering outside. The space divided as described above secures a sufficient work space, and a building or the like is constructed inside the space, thereby enabling work at a high position of the incinerator.
[0016]
The incinerator disassembling step 2 is a step for separating a chimney or the like installed in the incinerator to be dismantled from the furnace main body, and by separating a connecting portion where the chimney or the like is connected to the furnace main body, Etc. are to be removed.
[0017]
Next, the wetting step 3 is performed on the attached matter such as incineration ash containing dioxins. First, this wetting step 3 is performed by spraying a wetting agent onto the surface on which the deposits are attached, that is, the surfaces inside the incinerator and the chimney (hereinafter referred to as dioxin attached surfaces). For this spraying, a wetting agent mainly composed of a styrene-acrylic copolymer resin is used in a state of a viscosity of 3000 to 6000 cps, and is sprayed almost uniformly to the dioxin-adhered surface by a sprayer or a spraying device. This wetting agent wets the attached matter by penetrating into the attached matter, thereby preventing scattering as dust and facilitating the peeling.
[0018]
Subsequently, the process proceeds to the step of removing adhering substances from the dioxin-adhering surface. In the attached matter removing step 4, sublimable particles are blasted on the dioxin attached surface using a high-pressure injection device (blast machine). This high-pressure injection device (blast machine) includes a compressor, and can inject compressed air, and ejects sublimable particles when the compressed air is ejected. The jet speed and jet flow rate of the compressed air can be adjusted, and by adjusting the jet speed and the like, the jet speed and jet amount of the sublimable particles can be changed. These are adjusted according to the type of the sublimable particles, the adhesion strength of the attached matter, and the like, and an ejection nozzle suitable for the condition is selected. Here, in the present embodiment, dry ice particles are used as the sublimable particles. The dry ice particles are particles of a special shape formed in a cylindrical shape having a diameter of 2.5 to 3.0 mm and a length of 5 to 10 mm. The dry ice particles are sublimated into carbon dioxide gas, so that no contaminated water or contaminated waste material remains.
[0019]
Further, by using dry ice particles as sublimable particles, the dry ice particles ejected from the ejection nozzle, when colliding with the dioxin attachment surface, cool the attachment surface, and at the same time, cool the attachment surface and its surroundings. It absorbs heat from and vaporizes it. Therefore, there is no rebound of the dry ice particles after colliding with the dioxin-adhered surface, and the work can be performed in the vicinity where the dry ice particles are ejected. Furthermore, the cooling effect of the dry ice particles prevents dioxin deposits from evaporating, and the carbon dioxide gas after collision enters between the incinerator inner wall and the deposits, thereby effectively exfoliating the deposits. Is what you can do.
[0020]
In this step 4, since the deposits on the incinerator are sequentially removed in the above-mentioned closed section, the removed dioxin-containing substance (hereinafter, referred to as a removed substance) is removed from the furnace body by the furnace body. At the bottom of the section, and at other portions on the floor in the above section. The removed substances that are removed and deposited are recovered in the above-mentioned section, and are also processed in the subsequent removed substance processing step 5.
[0021]
The removal substance treatment step 5 is a step for treating the removal substance in a state where it can be carried out of the sealed section. Since the removal substance contains harmful dioxins as described above, it is solidified. It can be carried out by processing in a state where it has been set. Therefore, in the present embodiment, the above-mentioned substance to be removed is packed in a bag, and in this state, the substance is solidified by a solidifying agent.
[0022]
On the other hand, the surface of the incinerator after the dioxin-containing material is removed is subjected to a solidifying agent spraying step 6 as a final step. In the solidifying agent spraying step 6, the solidifying agent is sprayed on the surface after the attached matter is removed. As described above, the attached matter is removed from the surface of the incinerator or the like. Although it does not leave any kind, it is strictly covered with a solidifying agent as a precautionary measure in consideration of the possibility of remaining.
[0023]
As described above, by completing the solidifying agent spraying step 6, the incinerator is ready to be removed. In other words, the incineration ash containing dioxins is removed from the surface of the incinerator, and the solidifying agent is sprayed on the incinerator surface after the removal, so if a small amount of dioxins remains, Even so, they are processed so that they do not scatter into the atmosphere. Therefore, in this state, it is possible to dismantle and remove the incinerator and carry it out.
[0024]
Here, the chimney and the like that could not be separated in the initial disassembly step 2 are separated, and the incinerator main body is also divided so as to be transportable. The division here is broken down exclusively by mechanical means. Then, after disassembly as described above, the sheet material sealed and separated in the isolation step 1 is removed, the incinerator that is appropriately disassembled is removed, and the entire dismantling work of the incinerator is completed.
[0025]
The embodiment of the method for dismantling an incinerator is as described above. Next, an embodiment of a method for removing dioxins adhered to an object not requiring dismantling will be described. In the present embodiment, of the above-described incinerator dismantling method, the method is constituted by the remaining steps excluding the chimney removing step 2 and the solidifying agent spraying step 6. That is, as shown in FIG. 2, a dioxin attachment source isolation step 11, a dioxin attachment source wetting step 13, a dioxin removal step 14, and a dioxin-containing substance (removal substance) treatment step 15. It is done by and.
[0026]
The dioxin-adhering source isolation step 11 is a step of hermetically dividing an object to which a substance containing dioxins is attached so as to surround the entire body including the attached dioxins. Non-movable objects are hermetically sealed by an airtight sheet material at the installation location of the objects, but for movable objects, they are carried into a pre-built hermetic workplace, etc. A mode in which the object is isolated from the surroundings can be adopted. Note that, also in the present embodiment, the isolation step 11 can be a negative pressure isolation step. That is, by installing a ventilable dust collector in the closed section and sucking the air inside the section, the inside of the section can be maintained in a negative pressure state as compared with the outside, whereby contaminants and the like can be maintained. Leakage is prevented. Further, a space in which the work can be sufficiently performed is secured in the sealed section isolated as described above.
[0027]
The dioxin attachment source wetting step 13 is a step of spraying a wetting agent onto the surface on which the substance containing dioxins is attached, as in the case of the incinerator dismantling method. The wetting agent used here is mainly composed of a styrene-acrylic copolymer resin as described above, and serves to wet dioxins to prevent generation of dust.
[0028]
Also, in the dioxin removal step 14, the same type of high-pressure injection device (blast machine) and dry ice particles as in the case of the incinerator dismantling method are used, but the adhesion strength of the attached dioxins is different. The jet speed and flow rate are adjusted to suit the adhesion strength, and the particle size of the dry ice particles is changed. When changing the particle size of the dry ice particles, the ejection nozzle is also exchanged according to the particle size. The dry ice particles used as the sublimable particles used here become carbon dioxide gas at the dioxin attachment source, and as described above, penetrate between the surface of the dioxin attachment source object and the attachment. And to facilitate the detachment of the adhered matter.
[0029]
As described above, in the embodiment according to the incinerator disassembly method and the dioxin removal method, when removing the deposits contained in dioxins, blasting with dry ice particles as sublimable particles 4, According to 14, there is no need to separate and collect the blast material without mixing the blast material into the substance to be removed contained in the dioxins. In addition, since no contaminated water is generated as in the method using high-pressure water, it is possible to prevent the generation of waste materials to be treated as industrial waste in addition to the removed substances, and only substances containing dioxins as toxic substances It should be processed. Further, since there is no possibility that contaminated water or the like flows out to the ground, a pre-process for preventing the permeation into the ground and a post-process for collecting the contaminated water are not required.
[0030]
In addition, in the present embodiment, the dioxin-containing deposit removal steps 4 and 14 are provided with the wetting steps 3 and 13 for the surface to which dioxins are attached. It is intended to make the removal of the deposits possible and easy by the ejection of the sublimable particles at 4,14.
[0031]
Next, an embodiment of the invention relating to the asbestos removal method will be described. As shown in FIG. 3, the present embodiment includes an isolation step 22 for isolating the asbestos dust generation source, a scattering inhibitor spraying step 23 for the purpose of suppressing asbestos dust scattering, an asbestos removal step 24, and a removal surface. And a step of spraying 26 with a dust scattering prevention solidifying agent, and a step 25 of treating removed asbestos (removed substance).
[0032]
The isolation step 22 involves surrounding the entire room or building including the wall or ceiling provided with a fireproof material containing asbestos, a heat insulating material or a soundproofing material with an airtight sheet material such as a vinyl sheet. Is used to isolate the surrounding area. Here, vinyl sheets are also laid on the floor to be isolated or on the floor inside the building, and a work space sealed with these vinyl sheets is constructed. Furthermore, since the isolation step 22 is a negative pressure isolation step, a dust collector can be installed at an adjacent position in the work space. This dust collector is capable of collecting dust inside the work space with a negative pressure, and can use a dust collector having the same dust collection capability as in the isolation step 1 in the incinerator described above. In addition to sucking the air inside, a dust collection filter is installed in the exhaust path to prevent asbestos dust scattered in the work space from leaking outside. In addition, a clean room having an air shower room provided with an air shower in the middle is provided near the entrance of the work space and the outside, and when a worker who works in the work space goes out, dust is eliminated by the air shower. Have been able to be.
[0033]
After the completion of the isolation step 22 and the installation of the dust collection device, the shower room, and the like, the worker starts work in the work space. First, the process starts with a step 23 of spraying a scattering inhibitor on asbestos to be removed. The spraying step 23 is for suppressing scattering of asbestos during the removing operation, and is for moistening the asbestos so as not to be easily dusted. The styrene acrylic copolymer resin described above can be used as the scattering inhibitor used here.
[0034]
Subsequent to the scattering inhibitor spraying step 23, the process proceeds to an asbestos removing step 24. The removing step 24 is a step of removing the asbestos portion used as a refractory material, a heat insulating material, a soundproofing material or the like from a wall surface or a ceiling, etc., and is operated by several workers. This work removes the asbestos by blasting the sublimable particles toward the asbestos. The blast includes the same high-pressure injection device (blast machine) used in the above-described dioxin removal method. An apparatus is used. In the above operation, one worker operates a high-pressure injection device (blast machine) for blasting the sublimable particles to peel off the asbestos, and the remaining workers collect the peeled asbestos. It is responsible for the work.
[0035]
The asbestos collection operation is performed in parallel with the asbestos separation operation by sequentially collecting the asbestos separated. Then, the recovered asbestos is removed from the work space after being processed in the removal substance processing step 25. In this treatment step 25, the solidifying treatment is performed by spraying a solidifying agent onto asbestos, and can be carried out in parallel according to the progress of the asbestos collection work, and collects all the asbestos removed. After that, it is also possible to perform the processing collectively.
[0036]
A dust scattering prevention solidifying agent is sprayed again on the wall surface portion or the ceiling portion from which the asbestos has been removed in the spraying step 26, so that the asbestos which may remain is prevented from being scattered again as dust. This scattering prevention solidifying agent spraying step 26 is performed on the entire surface of the place where the refractory material, the heat insulating material or the soundproofing material is provided and the entire inner surface of the vinyl sheet, and is performed after the asbestos removing step 24 is completed. Therefore, even if a small amount of asbestos remains, the residual asbestos is covered and treated so as not to be scattered.
[0037]
In addition, as the sublimable particles to be blasted in the asbestos removal step 24, dry ice particles can be used. Since dry ice is sublimated at normal temperature, even if these particles are used as a blast material, the blast material does not remain as a waste material. In addition, the dry ice particles ejected from the high-pressure injection device (blast machine) reach the asbestos in a solid state, and can apply an impact force necessary for peeling to the asbestos, and also provide a gap between a wall or a ceiling where the asbestos is provided. The removal operation can be facilitated by the sublimated carbon dioxide gas entering.
[0038]
In the present embodiment, since the method is as described above, in the asbestos removal work on the wall portion or the ceiling portion, the operator can remove the asbestos by operating the high-pressure injection device (blast machine). Further, since the sublimable particles are used as the blast material, the blast material does not rebound in a solid state when the high-pressure injection device (blast machine) is used. Therefore, other operations such as a recovery operation can be performed even in the vicinity of the peeling operation without considering the rebound.
[0039]
Although the embodiments of the present invention are as described above, the present invention is not limited to these, and can take various aspects. For example, the sublimable particles used as the blast material have been described by exemplifying dry ice particles, but sublimable particles made of other substances can also be used. In the step of isolating the source of dioxins or asbestos dust, a vinyl sheet is exemplified as an air-tight sheet material, but this has been described as an example of a versatile and flexible material. It is possible to construct a work space or the like by using a sheet material or a shieldable member made of another material.
[0040]
Furthermore, in each of the above-described embodiments, a plurality of steps are used, but the order of each step can be appropriately changed. That is, in the embodiment involving the removal of dioxins, the processing steps 5 and 15 for the removal substance are performed collectively after the completion of the removal steps 4 and 14. In a working environment in which a large amount of substances to be removed is generated, more efficient work can be performed by performing the above-described parallel execution. Also, in the spraying steps 6 and 26 of the solidifying agent or the like applied to the surface from which dioxins or asbestos have been removed, it is not necessary to wait for all of the removing steps 4 and 24 to end. The spraying operation can be performed sequentially. In this case, by performing the spraying operation sequentially on the surface on which the removing operation has been completed, scattering of dust in the sealed section is prevented, and the working environment can be improved. Conversely, in an environment where the possibility of scattering of dust is low, the spraying steps 6 and 26 of the solidifying agent and the like may be performed after the removal substance processing step 25.
[0041]
【The invention's effect】
As described above, according to the dioxin removal method of the present invention, since sublimable particles are employed as the blast material, no blast waste material is generated in addition to the removed dioxin-containing substance. Therefore, since the blast material can be separated and collected by sand blasting or shot blasting, or the removal operation can be performed without considering prevention of leakage of contaminated water generated by the method using high-pressure water, the operation efficiency can be improved, and short-term and inexpensive can be achieved. Can be removed. Further, according to the present invention relating to the incinerator dismantling method using the above method, at the place where the incinerator is installed, there is no possibility that the contaminated water penetrates into the ground, so that safe dismantling work becomes possible and the environment for the surroundings can be improved. It can also dispel concerns about pollution.
[0042]
Furthermore, according to the use of dry ice particles as sublimable particles, the surface temperature of an object to which dioxins are adhered can be reduced, so that scattering of dioxins can be prevented, and Since the carbon dioxide gas enters between the object surface and the dioxin-containing deposit, the deposit can be easily and efficiently separated.
[0043]
On the other hand, according to the asbestos removal method of the present invention, it is not possible to work for more than a certain time in a tightly constructed work space or the like due to the health considerations of the worker. Therefore, a wide range of removal work can be performed within a predetermined time, and the construction period for asbestos removal can be shortened. Further, according to the present invention, since the scattering of asbestos dust in the working space is effectively suppressed, the working environment can be improved, and the visibility in the working space can be improved. Can be achieved. Moreover, since the blast material used for the blast is sublimable particles, no contaminated water or contaminated waste remains after the blast operation, and the blast material is easy to handle.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of the invention relating to a method for dismantling an incinerator.
FIG. 2 is an explanatory diagram showing an embodiment of the invention relating to a method for removing dioxins.
FIG. 3 is an explanatory diagram showing an embodiment of the invention relating to the asbestos removal method.
[Explanation of symbols]
1,11,21 Isolation process
2 Chimney removal process
3,13 Wetting process
4,14,24 removal process
5,15,25 Removal substance treatment process
6 solidifying agent spraying process
23 Splash inhibitor spraying process
26 Dust scattering prevention solidifying agent spraying process

Claims (12)

It is characterized by having a separation step of a dioxin attachment source, a wetting step of the dioxin attachment source, a dioxin removal step by blasting sublimable particles, and a treatment step by sealing or solidifying the removed dioxin. Dioxin removal method. The isolation step is a negative pressure isolation in which the dioxins are adhered to the source while being sealed by an airtight sheet material, and the inside of the sealed section is made negative by a dust collector that sucks air in the sealed section. The method for removing dioxins according to claim 1, which is a step. The method for removing dioxins according to claim 1, wherein the blast of the sublimable particles is a blast of dry ice particles. The method for removing dioxins according to claim 3, wherein the dry ice particles are formed as cylindrical particles having a diameter of 2.5 mm to 3.0 mm and a length of 5 mm to 10 mm. Incinerator isolation process, incinerator disassembly process, incinerator internal wetting process, dioxin-containing deposit removal process by blasting sublimable particles, and sealing or solidification of the removed dioxin-containing deposit. And a step of spraying a solidifying agent on the inner surface of the incinerator. The isolation step is a negative pressure isolation step of enclosing the incinerator with an airtight sheet material and enclosing the enclosed section, and reducing the inside of the enclosed section to a negative pressure by a dust collector that sucks air in the enclosed section. 6. The method for dismantling an incinerator according to claim 5. The incinerator dismantling method according to claim 5 or 6, wherein the blast of the sublimable particles is a blast of dry ice particles. The incinerator disassembly method according to claim 7, wherein the dry ice particles are formed in a cylindrical shape having a diameter of 2.5 mm to 3.0 mm and a length of 5 mm to 10 mm. An asbestos dust generation source isolation step, a spray inhibitor spraying step for the asbestos dust generation source, an asbestos removal step by blasting sublimable particles, a dust scattering prevention solidifying agent spraying step on the asbestos removal surface, A method of removing asbestos, comprising a treatment step of sealing or solidifying. The separating step is a dust collecting device that encloses a room or a building including a wall portion or a ceiling portion which is an asbestos dust generating source with an airtight sheet material while enclosing the entire room or building, and sucks air in the airtight portion. The method for removing asbestos according to claim 9, which is a negative pressure isolating step in which a negative pressure is applied to the inside of the closed section. The method for removing asbestos according to claim 9 or 10, wherein the blast of the sublimable particles is a blast of dry ice particles. The method for removing asbestos according to claim 11, wherein the dry ice particles are cylindrical particles having a diameter of 2.5 mm to 3.0 mm and a length of 5 mm to 10 mm.

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