JP2009273995A - Method for removing asbestos dust and dust removing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of removing asbestos dust, and a dust remover capable of surely removing asbestos dust while prolonging a filter life and reducing a cost by enabling an filter easily to be reused. <P>SOLUTION: A typical method of removing asbestos dust is characterized by disposing a ceramic filter 130 at the upper part in a water vessel 120 having water stored therein, sucking a gas containing asbestos dust 102 into the water vessel from the outside of the vessel, passing the sucked gas through the ceramic filter to catch the asbestos dust contained in the gas, and stopping sucking to drop the asbestos dust onto the water stored in the water vessel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust removal method and a dust removal device for collecting asbestos dust generated at a demolition work site and the like and removing the dust from the space.

  In recent years, asbestos-related health damage such as mesothelioma and lung cancer has been reported in various places, and products using asbestos are being removed, processed and disposed of. At the time of such removal, in order to prevent asbestos from being scattered around the removal site, the removal site is a space isolated from the outside, and a negative pressure dust removing device is installed so that the removal work can be performed in an environment maintained at a negative pressure.

  The negative pressure dust removing device is usually provided with a three-stage filter including a primary filter, a secondary filter, and a HEPA filter. The primary filter and the secondary filter are pre-filters that sequentially collect coarse particles out of the dust sucked by the negative pressure dust remover, and are provided to extend the life of the HEPA filter. The HEPA filter provided in the final stage can collect fine dust having a very small particle diameter.

  As a conventional dust removal technique for asbestos dust using the apparatus as described above, for example, in Patent Document 1, asbestos is peeled off by a suction force from the tip of a suction hose, and the peeled asbestos is separated into a bag filter and a HEPA in a receiver tank. Techniques for guiding and capturing to a filter device are disclosed. According to this technique, it is possible to improve the working efficiency and working environment of the asbestos collection work and to reliably prevent the asbestos from being scattered to the outside, thereby increasing the collection efficiency.

Further, for example, Patent Document 2 includes a liquid separation device that removes moisture and oil in a gas, and a dust collection device into which gas from the liquid separation device is introduced, and the dust collection device is formed in a cylindrical shape. A dust removing device is disclosed that includes a filter and a dust removing tool that is in sliding contact with the inside of the filter. According to this, it is said that dust of about 0.3 μm or less can be efficiently captured for a long period of time.
JP 2008-029942 A JP-A-11-128644

  However, in the conventional apparatus using the filter including the techniques described in Patent Documents 1 and 2, the filter is clogged as the dust is removed, so that the differential pressure of the suction pressure, that is, the pressure loss increases. End up. Therefore, when the pressure loss increases, the filter must be replaced as appropriate.

  Usually, the replaced used filter is regenerated and reused by performing a process such as backwashing (operation of passing a fluid in the reverse direction). However, since asbestos, which is an extremely thin fibrous crystal, is entangled between the fibers of the filter, it has been difficult to regenerate the filter by adsorbing asbestos by processing such as backwashing. For this reason, a new filter must be used at the time of filter replacement, and the reduction of the cost required for the filter is an issue. Among them, since the HEPA filter is expensive, a filter that has the same dust removal performance and can be reused by an easy regeneration process is required.

  Moreover, the used filter which adsorb | sucked asbestos is packed by the double plastic bag, and is disposed of by burying in the landfill disposal site as special management industrial waste. In addition to the negative pressure dust removal device described above, many filters are used as means for preventing asbestos dust from being scattered, and such filters are also disposed of as described above.

  However, since the volume of the filter is large, a large amount of space in the landfill site is consumed. For this reason, it is a matter of time that the capacity of the landfill site is insufficient with the current disposal method. Further, the disposal cost of the filter becomes high due to the large volume, which contributes to an increase in cost. Therefore, construction of a new dust removal system is required from the viewpoint of extending the life of the landfill site and reducing costs.

  In view of such a problem, the present invention makes it possible to easily re-use a filter, thereby removing asbestos dust that can reliably remove asbestos dust while extending the life and cost of the filter. It is an object to provide a method and a dust removal device.

  In order to solve the above-mentioned problem, a typical configuration of the dust removal method for asbestos dust according to the present invention is that a ceramic filter is disposed above a water tank in which water is stored, and gas containing asbestos dust is sent from the outside of the water tank to the water tank. Asbestos dust contained in the gas is trapped in the ceramic filter by passing the sucked gas through the ceramic filter, and the asbestos dust is dropped in the water stored in the water tank by stopping the suction. Features.

  With the above configuration, the captured asbestos dust can be removed from the ceramic filter simply by stopping the suction, and the ceramic filter can be easily reused without complicated processing such as backwashing. Become. Therefore, the life of the filter can be extended and the cost required for the filter can be reduced. Moreover, since the number of filters to be disposed of can be reduced, it is possible to reduce the cost required for disposal of the filters and contribute to extending the life of the landfill site.

  The capture surface of the ceramic filter may be disposed so as to have an angle of 90 ° or less with respect to the horizontal plane. Thereby, when suction is stopped, asbestos dust captured by the ceramic filter can be naturally dropped by gravity.

  The asbestos dust that has fallen into the water may be separated from the water by a dust collection filter. Thereby, it becomes possible to drain the water used for collecting asbestos dust as water from which asbestos dust, which is a harmful substance, is excluded.

  The sucked gas may be discharged toward the water surface.

  Asbestos dust contained in the gas is an inorganic mineral and has high hydrophilicity, so it is easily recovered in water (it does not float on the water surface but settles). Therefore, according to said structure, most asbestos dust contained in the discharge | released gas can be collect | recovered with water. As a result, it is possible to delay the occurrence of clogging of the filter and the increase in pressure loss resulting therefrom.

  The aspirated gas may be released into water. As a result, most of the asbestos dust contained in the released gas can be recovered with water, and the occurrence of clogging of the filter and the increase in pressure loss can be further delayed.

  The typical configuration of the asbestos dust removing device according to the present invention includes a water tank for storing water, an air inlet portion where gas containing asbestos dust flows into the water tank from outside the water tank, and a ceramic filter for capturing asbestos dust. The ceramic filter is disposed above the water tank, and the capturing surface of the ceramic filter is disposed at an angle of 90 ° or less with respect to the horizontal plane.

  The component corresponding to the technical idea in the dust removal method of asbestos dust mentioned above and its description are applicable also to the dust removal apparatus of the asbestos dust.

  The bottom surface of the water tank is preferably funnel-shaped. As a result, asbestos dust that has fallen into the water and collected in the water easily accumulates in one place when it settles in the water, the asbestos dust can be easily collected.

  The end of the inlet portion may be installed toward the water surface. Thereby, the direction in which the gas is discharged is the direction in which the water surface exists. Therefore, a part of asbestos dust contained in the gas can be collected by such water, and the occurrence of clogging of the filter and the increase in pressure loss can be delayed.

  The end of the above-mentioned inlet part is good to be installed in water. Thereby, since the gas is released into the water, most of the asbestos dust contained in the gas can be recovered by the water, and the occurrence of clogging of the filter and the increase in the pressure loss can be further delayed.

  The dust removing device may further include a mist separator between the water surface and the ceramic filter. As a result, moisture and water droplets contained in the gas can be separated, so that moisture absorption of the ceramic filter and adhesion of water droplets can be prevented, and an increase in pressure loss can be prevented.

  The dust removing device may further include a pressure gauge that detects a differential pressure before and after the ceramic filter, and a control unit that stops suction of the dust removing device when the value of the pressure gauge is equal to or greater than a predetermined value.

  With this configuration, when the differential pressure increases due to clogging or the like of the ceramic filter, the control unit can stop the suction of the dust removing device and remove the captured asbestos dust from the ceramic filter. Accordingly, since it is not necessary to manually operate the dust removal device, it is possible to reduce costs such as labor costs.

  The dust removing device may further include a HEPA filter on the downstream side of the ceramic filter. As a result, it is possible to capture the asbestos dust that has passed through the ceramic filter due to breakage of the ceramic filter or the like by the HEPA filter. Therefore, the certainty of the dust removal performance of the dust remover is improved.

  The dust removing device may further include a cyclone separator on the upstream side of the air inlet. As a result, coarse dust contained in the gas can be removed in advance before being sucked into the water tank, and the occurrence of clogging of the filter and an increase in pressure loss can be prevented.

  Another configuration of the asbestos dust removing device according to the present invention is characterized in that two or more of the asbestos dust removing devices described above are provided, and the dust removing device that sucks in gas containing asbestos dust can be selectively switched. And

  With the above configuration, when the dust removing device that is sucking the gas stops the suction due to clogging of the ceramic filter or the like, it is possible to select another dust removing device other than the stopped dust removing device and start the suction. Therefore, even if the dust removal device is stopped, the work can be efficiently performed without interrupting the removal work.

  According to the present invention, the filter can be easily reused, and asbestos dust can be reliably removed while extending the life of the filter and reducing the cost.

[Embodiment]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
FIG. 1 is a diagram for explaining the overall configuration of an asbestos dust removing device. Hereinafter, the dust removal device for asbestos is referred to as a “dust removal device”. FIG. 1A is a diagram illustrating a dust removing device before gas suction, FIG. 1B is a diagram illustrating a dust removing device during gas suction, and FIG. 1C is a dust removal after gas suction is stopped. It is a figure explaining an apparatus.

  As shown in FIG. 1A, the dust removing device 100 includes an air inlet 110, a water tank 120, a ceramic filter 130, a dust collection filter 140, a pressure gauge 150, a control unit 160, and an exhaust unit 170. It is comprised including.

  The air intake section 110 flows the gas containing asbestos dust generated at the site of removing the product using asbestos from the outside of the water tank 120 into the water tank 120. In the present embodiment, the gas flowing in from the air inlet 110 is discharged between the ceramic filter 130 and the water surface, but is not limited to this, and as in other embodiments described later, It is also possible to release gas into the water stored in the water tank 120.

  The water tank 120 stores water for collecting asbestos dust. As a result, asbestos dust that has fallen from the ceramic filter 130 when the suction is stopped can be recovered by the water stored in the water tank 120.

  The ceramic filter 130 captures asbestos dust contained in the gas flowing in from the air inlet 110. Unlike the fibrous filter used in the conventional dust removing device, the ceramic filter 130 has a structure in which fibrous substances such as asbestos are not easily entangled.

  The ceramic filter 130 is preferably a filter having a performance equal to or higher than that of the HEPA filter, that is, a performance of “capturing efficiency of particles of 0.3 μm of 99.97% or higher”. A filter or a cordierite ceramic filter can be preferably used. Accordingly, the dust removing apparatus 100 can be easily regenerated without using a HEPA filter that is difficult and expensive to regenerate, and has a dust removal performance equivalent to or higher than that when using a HEPA filter. Is possible.

  The ceramic filter 130 is disposed above the water tank 120, and its capturing surface is parallel to the horizontal plane, that is, has an angle of 90 ° or less with respect to the horizontal plane. With the above configuration, the asbestos dust captured by the ceramic filter 130 can be naturally dropped by gravity when the suction of the dust removing device 100 is stopped. The installation angle of the ceramic filter 130 may be an angle at which the captured asbestos dust can naturally fall or slide down from the ceramic filter 130 by gravity. In particular, when the angle is 90 ° or less with respect to the horizontal plane, the captured asbestos dust can be surely naturally dropped or slid down from the ceramic filter 130.

  The dust collection filter 140 separates asbestos dust and water that have fallen into the water in the water tank 120. Thereby, it becomes possible to drain the water used for recovery as water excluding asbestos dust. In the present embodiment, a membrane filter is used as the dust collection filter 140. A membrane filter having a pore size that does not allow asbestos dust to pass through can be used, and is suitable for use in the final treatment filtration.

  The pressure gauge 150 detects the differential pressure before and after the ceramic filter 130. The controller 160 stops the suction of the dust removing device 100 when the value of the pressure gauge 150 is equal to or greater than a predetermined value. The suction stop may be the stop of the vacuum pump or the suction valve (not shown) of the inlet part 110 may be closed if the control unit 160 controls the vacuum pump as in this embodiment. But you can. Accordingly, when the pressure difference across the ceramic filter 130 becomes a predetermined value or more due to clogging or the like, the suction of the dust removing device 100 can be stopped and the asbestos dust can be removed (dropped) from the ceramic filter 130.

  Further, by providing the control unit 160 with a timer such as a timer, it is possible to set a predetermined time or a predetermined time. Thereby, even if the value of the pressure gauge 150 does not reach the predetermined value or more, the suction of the dust removing device 100 is stopped when the predetermined time elapses or when the predetermined time is reached, and the asbestos dust is removed from the ceramic filter 130. The pressure can be recovered.

  The exhaust part 170 flows in from the inlet part 110 and exhausts the gas from which asbestos dust has been removed by the ceramic filter 130. The exhaust unit 170 is connected to a vacuum pump, and the pressure in the dust removing apparatus 100 is kept at a negative pressure by the vacuum pump performing suction.

  As shown in FIG. 1B, when the dust removing device 100 starts to suck the gas, asbestos dust 102 contained in the gas flowing in from the inlet portion 110 is captured by the ceramic filter 130. Thereby, the gas from which the asbestos dust 102 has been removed is exhausted from the exhaust part 170. Then, when the differential pressure before and after the ceramic filter 130 detected by the pressure gauge 150 becomes a predetermined value or more, the control unit 160 stops the suction of the dust removing device 100.

  When the suction of the dust removing device 100 is stopped, asbestos dust 102 captured by the ceramic filter 130 falls into the water in the water tank 120 by gravity as shown in FIG. The water containing the dropped asbestos dust 102 is separated into asbestos dust and water by the dust collection filter 140. Therefore, the captured asbestos dust 102 can be removed from the ceramic filter 130 only by stopping the suction of the dust removing device 100, and the ceramic filter 130 can be easily reused.

  Here, the ceramic filter 130 is porous through which fluid can pass, but since it is not fibrous like the HEPA filter, the ceramic filter 130 does not enter even inside asbestos which is a fibrous crystal. Movement is prevented at 130 surface (capture surface). Thus, while the suction is continued, the surface is held by the negative pressure, but when the suction is stopped, it is dropped by gravity.

  Therefore, by arranging the trapping surface (upstream surface) of the ceramic filter at an angle of 90 ° or less with respect to the horizontal plane, it is possible to remove the deposited asbestos from the surface of the ceramic filter 130 when the suction is stopped. it can. And asbestos can be reliably collected by arrange | positioning a water tank below the ceramic filter 130. FIG.

  Although the ceramic filter 130 can be reused by stopping the suction of the dust removing device 100 as described above, in order to ensure perfect removal of the asbestos dust 102 from the ceramic filter 130, After the suction is stopped, the ceramic filter 130 may be washed with a shower or backwashed with a pulse jet. In addition, a heater (not shown) for rapid drying after shower cleaning may be installed on the ceramic filter 130.

  Drawing 2 is a figure explaining the composition of the dust removal device concerning other embodiments. FIG. 2A is a diagram for explaining the configuration of the dust removing apparatus according to the second embodiment, and FIG. 2B is a diagram for explaining the configuration of the dust removing apparatus according to the third embodiment. In the following description of the second embodiment and the third embodiment, components having substantially the same functions as those of the above-described first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 2 (a), the dust removing apparatus 200 according to the second embodiment includes an air inlet 210, a water tank 220, a ceramic filter 230, a HEPA filter 240, a cyclone separator 250, and a mist separator 260. The pressure gauge 150, the control unit 160, and the exhaust unit 170 are configured.

  The inlet portion 210 has its end 210a disposed toward the water surface, and the gas that has flowed in is discharged toward the water surface. Since asbestos, which is an inorganic substance, is easily recovered in water, according to the above configuration, a part of the asbestos dust contained in the gas released from the terminal 210a can be recovered with water. As a result, it is possible to delay the occurrence of clogging of the ceramic filter 230 and the increase in pressure loss resulting therefrom.

  The water tank 220 has a funnel shape on the bottom surface 220a. Thereby, when the asbestos dust collected in water settles, it becomes easy to accumulate | store in one place, can collect | recover asbestos dust easily, and does not need to collect | recover all the water. The water used for collecting asbestos can be used for mixing concrete used for landfill disposal of asbestos waste at a landfill site. Thereby, it is possible to treat such water safely.

  The ceramic filter 230 is installed at an angle of 90 ° or less with respect to the horizontal plane, that is, an acute angle. Thereby, when the suction of the dust removing device 200 is stopped, the asbestos dust can be naturally dropped by gravity.

  The HEPA filter 240 is provided on the downstream side of the ceramic filter 230. The HEPA filter 240 is JIS Z 8122 “Air having a particle collection rate of 99.97% or more with respect to particles having a rated air volume and a particle size of 0.3 μm and an initial pressure loss of 245 Pa or less. It is a filter that satisfies the definition of “filter”. Thereby, the asbestos dust that should have passed the ceramic filter 230 can be captured by the HEPA filter 240, and the certainty of the dust removal performance can be improved.

  The cyclone separator 250 is provided on the upstream side of the inlet portion 210. Thereby, when a lot of coarse dust is contained in the gas, the coarse dust is removed in advance before being sucked into the water tank 220, and an increase in pressure loss can be prevented.

  The mist separator 260 is provided between the surface of the water stored in the water tank 220 and the ceramic filter 230. Thereby, the droplets generated at the time of gas release and the water contained in the gas are separated from the gas by the mist separator 260, the adhesion of water droplets to the ceramic filter 230 can be prevented, and the increase in pressure loss can be prevented.

  As shown in FIG. 2B, the dust removing apparatus 300 according to the third embodiment includes a water tank 120, an air inlet 310, a ceramic filter 330, a dust collection filter 140, a pressure gauge 150, and a controller 160. And an exhaust part 170.

  The inlet portion 310 is installed in the water whose end 310a is stored in the water tank 120, and the gas that flows in is discharged into the water. As a result, most of the asbestos dust contained in the released gas can be recovered with water, and the occurrence of clogging of the ceramic filter 330 and the increase in pressure loss can be further delayed.

  The ceramic filter 330 is installed in the water stored in the water tank 120. As described above, when the gas flowing in from the inlet portion 310 is released into the water, it is conceivable that water droplets collected from the asbestos dust are generated. At this time, if the ceramic filter 330 is installed in the air above the water surface, the droplets adhere to the ceramic filter 330, and the asbestos dust may adhere firmly to the ceramic filter 330 after the moisture in the droplets dries. .

  Therefore, by installing the ceramic filter 330 in the water, the state in which the ceramic filter 330 is always immersed in water can be maintained, and strong adhesion of asbestos dust to the ceramic filter 330 can be prevented. In the case where the sucked gas is discharged into water as in the third embodiment, when the ceramic filter is installed in the air above the water surface, the water surface and the ceramic are used to prevent the above-mentioned adhesion. It is preferable to install a mist separator (see FIG. 2A) between the filters 330.

  FIG. 3 is a diagram illustrating the configuration of a dust removing device according to still another embodiment. As shown in FIG. 3, the dust remover 400 according to the fourth embodiment includes dust removers 400 a and 400 b, an air inlet 410, a controller 460, and an exhaust 470. In the fourth embodiment, the dust removing device 400 is provided with two dust removing devices, the dust removing devices 400a and 400b, but is not limited thereto, and two or more dust removing devices may be provided. Is possible. Hereinafter, in the description of the fourth embodiment, components having substantially the same functions as those of the above-described first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The dust removing device 400a includes a water tank 120, a ceramic filter 130, a dust collection filter 140, and a pressure gauge 450a. The pressure gauge 450a detects a differential pressure before and after the ceramic filter 130 of the dust removing device 400a.

  The dust remover 400b includes a water tank 120, a ceramic filter 130, a dust collection filter 140, and a pressure gauge 450b. The pressure gauge 450b detects the differential pressure before and after the ceramic filter 130 of the dust removing device 400b.

  The air inlet 410 flows a gas containing asbestos dust from the outside of the water tank 120 into the water tank 120. The intake section 410 includes intake valves 410a and 410b. By opening and closing the intake valves 410a and 410b, the dust removing device that performs intake can be selectively switched.

  When the value of the pressure gauge 450a or 450b is equal to or greater than a predetermined value, the control unit 460 selectively switches the dust removing device that sucks the gas. That is, of the dust removing devices 400a and 400b, the suction of one dust removing device that is performing suction is stopped, and the suction by the other dust removing device that is not performing suction is started.

  The exhaust unit 470 exhausts the gas from which asbestos dust has been removed by the ceramic filter 130. The exhaust unit 470 includes exhaust valves 470a and 470b. By opening and closing the exhaust valves 470a and 470b, the dust removing device that performs exhaust can be selectively switched.

  For example, when the dust remover 400a of the two dust removers of the dust remover 400 is sucking gas, the intake valve 410a of the intake section 410 is open and the intake valve 410b is closed. Yes. Further, the exhaust valve 470a of the exhaust part 470 is in an open state, and the exhaust valve 470b is in a closed state.

  The pressure gauge 450a detects the differential pressure before and after the ceramic filter 130 of the dust removing device 400a, and when the value exceeds a predetermined value, the control unit 460 closes the intake valve 470a and the exhaust valve 410a to thereby remove the dust removing device 400a. Is stopped, and suction of the dust removing device 400b is started by opening the intake valve 410b and the exhaust valve 470b.

  With the above configuration, even when the pressure difference across the ceramic filter 130 of the dust removing device 400a becomes equal to or greater than a predetermined value due to clogging or the like, the dust removal device 400b can continuously suck the gas. Therefore, even in the removal work over a long operation, the work can be efficiently performed without interrupting the removal work by stopping the dust removing device.

  Similarly to the first embodiment, the control unit 460 includes a timer such as a timer, so that a predetermined time or a predetermined time can be set. Thereby, even if the value of the pressure gauge 450a or 450b does not reach the predetermined value or more, the suction of the dust removing device 100 is stopped when the predetermined time has elapsed or the predetermined time has been reached, and the asbestos dust is removed from the ceramic filter 130. This makes it possible to recover the differential pressure.

  The operation of the control unit 460 described above is an example when the dust removing apparatuses 400a and 400b are connected to the same pump (not shown), and is not limited thereto. For example, when the dust removers 400a and 400b are connected to different vacuum pumps, the control unit 460 stops the vacuum pump connected to the dust remover 400a that is performing suction, and is connected to the dust remover 400b. A vacuum pump may be activated.

  Below, the effect of this invention is demonstrated using the result of the suction test of asbestos dust. In this suction test, a silicon carbide ceramic filter (average pore diameter of 2.0 μm, thickness of 1 mm) was used as Example 1, and a membrane filter (Environment Agency Notification No. 93 “Specification of Asbestos” on the back surface (surface not capturing surface)) A commercially available filter paper made of circular cellulose ester having an average pore diameter of 0.8 μm based on the “Dust Concentration Measuring Method” was installed. Further, as Example 2, a cordierite ceramic filter (average pore diameter 1.5 μm, thickness 1 mm) was used, and a membrane filter (same as above) was installed on the back surface thereof. In the comparative example, only a membrane filter (same as above) was used. In addition, about the average hole diameter of the Example, it measured using the mercury porosimeter.

  The above suction test was conducted in accordance with Environmental Agency Notification No. 93 “Measurement Method of Concentration of Specific Dust Containing Asbestos”. Each filter of the example and the comparative example is shaped into a circle having a diameter of 47 mm, and each shaped filter is attached to a holder defined in the Environmental Agency Notification No. 93 so that the effective filtration surface has a diameter of 35 mm. Then, a gas containing asbestos dust (crocidolite / amosite mixed dust) sealed in an airtight container was aerated (sucked) through each filter at a flow rate of 10 L / min for 20 minutes. In the Environment Agency Notification No. 93, the aeration time is defined as 4 hours. However, the gas used in this test has a high asbestos dust concentration, so the aeration time was 20 minutes.

  Next, the membrane filters used in the ventilated examples and comparative examples were clarified with acetone vapor according to the procedure prescribed in Environmental Agency Notification No. 93, and triacetin was dropped to prepare a microscope specimen. Then, the microscope specimen was observed with a phase contrast microscope, and fibrous substances (asbestos dust) having a length of 5 μm or more and an aspect ratio (length to width ratio) of 3 or more were counted.

  In the preparation of the above-mentioned microscope specimen, the ceramic filter used in the examples is not transparent, so it is difficult to observe asbestos using a microscope. Therefore, as described above, in the embodiment, when the asbestos dust passes through each ceramic filter by installing the membrane filter on the back surface of each ceramic filter, the asbestos dust is captured by the membrane filter installed on the back surface. And it becomes possible to grasp | ascertain the passage state of asbestos dust of each ceramic filter used for the Example by using this membrane filter as a microscope sample and observing the capture state of the asbestos dust.

  FIG. 4 is a view showing microscope specimens in Examples and Comparative Examples. 4A shows a microscope specimen according to Example 1, FIG. 4B shows a microscope specimen according to Example 2, and FIG. 4C shows a microscope specimen according to a comparative example. As shown in FIGS. 4 (a) and 4 (b), the adhesion of fibrous material (asbestos) was confirmed in the microscopic sample prepared using the membrane filter installed on the back of each ceramic filter of Examples 1 and 2. There wasn't. On the other hand, in the comparative example, a large number of fibrous substances were confirmed to adhere as shown in FIG.

  From the above results, it can be seen that the vented asbestos dust is captured by the ceramic filters of Examples 1 and 2 and does not pass through the ceramic filters. From this, it can be understood that the ceramic filter is effective in removing asbestos dust.

  Next, the asbestos dust adhesion state to the ceramic filter of the example during and after the asbestos dust suction test was confirmed. FIG. 5 is a diagram illustrating the state of the example during and after the asbestos dust suction test. FIG. 5 (a) is a diagram for explaining the adhesion state of asbestos dust to the ceramic filter of Example 2 during the suction test. By attaching an adhesive tape to the ceramic filter of Example 2 during the suction test, FIG. The state of the adhesive tape which transferred dust is shown. FIG.5 (b) is a figure which shows the state of the ceramic filter of Example 2 after a suction test.

  As shown to Fig.5 (a), since asbestos dust has adhered (transferred) to the adhesive tape, it turns out that asbestos dust is trapped by the ceramic filter during the suction test. However, as shown in FIG.5 (b), a fibrous substance is not confirmed by the ceramic filter of Example 2 after a suction test. From this, it is considered that asbestos dust is captured by the ceramic filter during suction, but is detached from the ceramic filter after the suction is stopped.

  From the above results, it can be seen that the asbestos dust can be removed with high efficiency by applying the ceramic filter to the asbestos dust removing method and dust removing apparatus. In addition, asbestos dust trapped in the ceramic filter is detached from the ceramic filter simply by stopping the suction, so that the asbestos dust can be easily removed and reused without any complicated treatment such as backwashing. I understand that it is possible.

  Therefore, according to the present invention, the lifetime of the filter can be extended and the cost required for the filter can be reduced. Moreover, since the number of filters to be disposed of can be reduced, it is possible to reduce the cost required for disposal of the filters and contribute to extending the life of the landfill site.

  As mentioned above, although the suitable Example of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the embodiment which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used as a dust removal method and dust removal device for asbestos dust that collects asbestos dust generated at a demolition work site and removes dust from the space.

It is a figure explaining the whole structure of the dust removal apparatus of asbestos. It is a figure explaining the structure of the dust removal apparatus concerning other embodiment. Furthermore, it is a figure explaining the structure of the dust removal apparatus concerning other embodiment. It is a figure which shows the microscope sample in an Example and a comparative example. It is a figure explaining the state of the Example during an asbestos dust suction test and after a test.

Explanation of symbols

100, 200, 300, 400, 400a, 400b ... dust removing device 102 ... asbestos dust 110, 210, 310, 410 ... air inlet part 210a, 310a ... terminal 120, 220 ... water tank 220a ... bottom face 130, 230, 330 ... ceramic filter 140 ... Dust collection filters 150, 450a, 450b ... Pressure gauges 160, 460 ... Control part 170, 470 ... Exhaust part 240 ... HEPA filter 250 ... Cyclone separator 260 ... Mist separator

Claims (12)

Place the ceramic filter in the upper part of the water tank that stores water,
Aspirate the gas containing asbestos dust from outside the water tank into the water tank,
By passing the sucked gas through the ceramic filter, the asbestos dust contained in the gas is captured in the ceramic filter,
A dust removal method for asbestos dust, wherein the asbestos dust is dropped into water stored in the water tank by stopping suction.   2. The method for removing asbestos dust according to claim 1, wherein the capturing surface of the ceramic filter is disposed at an angle of 90 [deg.] Or less with respect to a horizontal plane.   The asbestos dust removal method according to claim 1 or 2, wherein the asbestos dust falling into the water is separated from the water by a dust collection filter.   The asbestos dust removal method according to any one of claims 1 to 3, wherein the sucked gas is discharged toward a water surface of the water.   4. The method for removing asbestos dust according to claim 1, wherein the sucked gas is discharged into the water. A water tank for storing water;
An air inlet part into which the gas containing asbestos dust flows into the water tank from outside the water tank;
A ceramic filter for capturing the asbestos dust,
An asbestos dust removing device, wherein the ceramic filter is disposed above a water tank, and the capturing surface of the ceramic filter is disposed at an angle of 90 ° or less with respect to a horizontal plane.   The dust removal apparatus for asbestos dust according to claim 6, wherein the bottom surface of the water tank has a funnel shape.   The dust removal apparatus for asbestos dust according to claim 6 or 7, wherein a terminal end of the inlet portion is installed toward a water surface of the water.   The asbestos dust removing device according to claim 6 or 7, wherein a terminal end of the inlet portion is installed in the water.   10. The dust removal apparatus for asbestos dust according to claim 8, further comprising a mist separator between the water surface and the ceramic filter. The dust removal device further includes
A pressure gauge for detecting a differential pressure before and after the ceramic filter;
The asbestos dust removing device according to any one of claims 6 to 10, further comprising a control unit that stops suction of the dust removing device when the value of the pressure gauge is equal to or greater than a predetermined value. .   Asbestos dust, wherein two or more asbestos dust removal devices according to any one of claims 6 to 11 are provided, and the dust removal device for sucking gas containing asbestos dust can be selectively switched. Dust removal equipment.