JP2001090353A - Demolishing method of structure polluted by dioxins, and method for purifying dioxins - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demolishing method of a structure polluted by dioxins of safe, economical and environment-harmonized type making use of the dioxins decomposition capacity of microorganisms, and a method for purifying dioxins. SOLUTION: Dioxins are decomposed by microorganisms by adhering the component containing microorganisms having the dioxin decomposition capacity and a film-forming fixing agent to the dioxins in an incineration facility and soils therearound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a dioxin-contaminated structure and a method for purifying dioxins, and more particularly to a structure contaminated with dioxins by using a composition containing microorganisms. And a method for purifying dioxin compounds.

[0002]

2. Description of the Related Art Dioxins have become a serious social problem that affects the survival of garbage incineration plants. There are about 1,800 incineration facilities in Japan, and it is estimated that there are currently about 22 facilities that need urgent measures. However, it is said that if the legal regulations are further strengthened from December 1, 2002, there are about 1,600 existing facilities that do not conform to the regulations. For facilities that do not conform to these regulation values, it is necessary to dismantle all facilities or improve only incinerators among incinerator facilities. It is necessary to take measures for processing. In performing such demolition work and removal work,
The removal and detoxification of dioxins that are attached to the inside of an incineration plant or the like and cause contamination are indispensable treatments for preventing the spread of contamination by dioxins. FIGS. 1 and 2 show the generation mechanism of dioxins in the refuse incineration process and the path of dioxins in the refuse incineration process, respectively.

As shown in FIG. 1, when refuse G is burned in the incinerator 1 of the incineration plant, fly ash, that is, fly ash FA is formed as a result of a chemical reaction due to the burning. Garbage G
The particulate carbon on the fly ash FA generated by the combustion reaction R of the organic compound ORG contained in the so-called de novo synthetic DN that reacts with chlorine CL generated by the combustion of the garbage G to form dioxins is 300 to It is generated in the cooling tower 2 in the low temperature range of 400 ° C. and in the dust collector 3. As a result, dioxins D originally contained in the garbage G
In addition, dioxins generated by combustion adhere to the inner surface of each facility of the incineration plant, thereby generating dioxin contamination. The dioxins referred to in the present invention mainly refer to polychlorinated dibenzoparadioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). The incineration ash 4 containing the dioxin compound is recovered as the incineration ash 4 as shown in FIG. 1, but a part of the incineration ash passes through the dust collector 3 and is discharged from the top of the chimney as exhaust gas EG. .

[0004] FIG. 2 is a diagram showing the treatment of incineration ash 4 deposited in each facility for each garbage incineration process in an incineration plant. The incineration ash 4 accumulated in the combustion furnace 1 is deposited on the ash pit 5, and as a result, the inner surface of the ash pit 5 is also contaminated with the dioxin compound. The incineration ash 4 accumulated in the ash pit 5 is collected together with the fly ash FA trapped by the dust collector 3 and finally landfilled at the landfill LF as industrial waste. The incineration ash 4 that cannot be collected by the dust collector 3 flows to the chimney 6 and contaminates the inside of the chimney 6. The gas generated by the combustion is finally discharged from the top of the chimney 6 as the exhaust gas EG.

Heretofore, several methods have been known for removing dioxins which have adhered to the inner surface of each facility of such an incineration plant and caused contamination. As such a removing method, for example, a method in which dioxins are removed to some extent by the air blasting method, and then the removed dioxins are rendered harmless in another treatment facility. According to this method, although the combustion ash 4 containing dioxins can be removed to some extent, dioxins contaminated and contaminated are not completely removed, and dioxins that could not be removed in the next dismantling or removal work are removed. Scattering and the like adversely affect the human body, and the spread of dioxin contamination to the surrounding environment has become a major problem. In addition, when dioxins contaminated and contaminated by the water jet method are removed from the inner surface of the incineration plant, it is very difficult to use a large amount of water for removal, and it is very difficult to treat the water after dioxin removal. Is also a major problem.

In the water jet method as described above, a method for treating the removed dioxin compound is additionally required. The treatment of dioxins removed from the facilities of such contaminated incineration plants has been attempted by applying technologies such as photochemical decomposition, supercritical hydroxylation, catalytic oxidation, and solvent extraction. I have. However, a common problem with each technology is that
At present, it is pointed out that the amount that can be processed at one time is small, the cost required for processing is extremely high, and that it is difficult to install a temporary plant at the original position.

Microorganisms, especially white rot fungi, have been noted for their ability to degrade hard-to-degrade environmental pollutants, specifically, dioxins and coplanar PCBs. (John A. Bumps, Ming Tien David Wrigh
t, and Steven D. Aust, Oxidation of Persistent Env
ironmental Pollutants by a White Rot Fungus, Scien
ce 228: 1434-1436, 1985). Since then, in recent years, a number of studies related to the degradation of dioxins by microorganisms have been performed, and for example, these studies have been described by R.-M.
The ones described in the review by ttich can be mentioned (R.-M. Wittich, Degradationof dioxin-like
compounds by microorganisms, Appl. Microbiol. Bio
technol. 49: 489-499, 1998).

[0008] As described above, there is known a method for preparing a microorganism carrier using an entrapping immobilizing agent and applying the microorganism carrier to an aqueous contaminant purification treatment. Also, dioxin-contaminated soil and the like are known. A so-called bioremediation technique is also known in which dioxins are decomposed and made harmless by spraying microorganisms having a resolution.

However, when dismantling each facility of the incineration plant, it does not scatter contaminants such as dioxins in the surrounding environment, and further disperses the dioxins of the industrial waste after disassembly into dioxin-degrading microorganisms as a comprehensive immobilizing agent. In order to solve the above-mentioned problems, it is possible to decompose and detoxify dioxins in a solid-phase system by spraying and immobilizing directly on a contaminated part as a solution mixed with a dioxin decomposing activated nutrient component, etc. Is needed.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an immobilizing agent composition containing a dioxin-degrading microorganism (hereinafter abbreviated as dioxin agent). ) To prevent the scattering of dioxins, to decompose and detoxify dioxins with microorganisms, and to carry out waste treatment after decomposition and detoxification. It is an object of the present invention to provide an economical and environmentally friendly dismantling method for dioxin-adhered contaminated structures and a method for purifying dioxins.

[0011]

The above object of the present invention is achieved by providing a dismantling method and a purification method according to the present invention.

That is, according to the first aspect of the present invention, the incineration facilities contaminated with dioxins are cut off from the surrounding environment, and microorganisms having dioxin degradability and film-forming properties are formed on the inner surface of the incineration facilities. And a method of dismantling a dioxin-contaminated structure, characterized in that the incinerator facility is dismantled by depositing a coating of a composition containing the above-mentioned fixing agent.

According to the invention of claim 2 of the present invention, there is provided a dismantling method, wherein the microorganism is a white rot fungus.

According to the third aspect of the present invention, there is provided a dismantling method, wherein the composition contains a nutrient for activating dioxins.

According to the invention of claim 4 of the present invention, there is provided a dismantling method, wherein the dioxins are decomposed by the microorganism after dismantling the incineration facility.

According to the invention of claim 5 of the present invention, there is provided a dismantling method, wherein the dismantling of the incineration plant is performed by using wire sawing.

According to the invention of claim 6 of the present invention, the disassembly method is characterized in that the composition is adhered in the form of a mist and circulated through the inner surface of the incinerator facility. Is provided.

According to the invention of claim 7 of the present invention, there is provided a dismantling method, wherein the adhesion of the composition is performed by spraying the composition on the inner surface of the incineration facility. .

According to the invention of claim 8 of the present invention, a composition comprising a microorganism capable of decomposing dioxins in a contaminated area contaminated with dioxins, a film-forming immobilizing agent, and a nutrient activated by decomposition and activation of dioxins. A method for purifying dioxins, comprising decomposing dioxins in the contaminated area by the microorganism after depositing a coating of a substance.

According to a ninth aspect of the present invention, there is provided a method for purifying dioxins, wherein the contaminated area is an inner surface of an incineration plant.

According to a tenth aspect of the present invention, there is provided a method for purifying dioxins, wherein the contaminated area is soil around incineration facilities.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 3 is a flowchart showing details of the disassembly method of the present invention. The incineration plant dismantling method of the present invention starts from step 100, and in step 101, each facility of the incineration plant is shut off from the surrounding environment. In step 102, the dioxin treating agent is circulated through the inner surface of each facility of the incineration plant contaminated with dioxins, or the dioxin treating agent is sprayed on the inner surface of each contaminated facility of the incineration plant. After the incineration ash 4 containing dioxins is prevented from being scattered during the dismantling process by being attached to the inner surface of each facility in the plant, the dismantling process of step 103 is performed. The dismantling process of the present invention further includes a step of decomposing and detoxifying the industrial waste obtained in step 103 with a microorganism in step 104, and discarding the industrial waste in which dioxins are decomposed and detoxified in step 105. May be.

The dioxin-decomposing microorganisms used in step 102 of the dismantling method of the present invention include bacteria, yeasts, molds, and basidiomycetes. The dioxin treating agent of the present invention is a dioxin decomposition-activating nutrient that activates the ability to decompose and detoxify cultured cells and dioxins, and an immobilization agent that can immobilize dioxins adhered and contaminated on the inner surface of an incineration facility. It is manufactured as a composition mixed with an agent.

Among the above-mentioned microorganisms, wood-rot fungi that metabolize lignin are preferable. Examples of these wood-rot fungi include Coriolus (Coriolus versicolor IFO 9791, etc.),
Phanerochaete sordida, YK-624 ATC
C 90872, Phanerochaete chrysosporium IFO 31249
Daedalea dickinsii IFO 3116
3), Polyporus (Polyporus adusata IFO 5307), Lentites (Lenzites BetulisaIFO 8715), Ganoderma
(Ganoderma lucidum IFO 31863 etc.), Pleurotus
(Pleurotus osteatus IFO 30776, etc.), Irpex (I
rpex lacteus ATCC 11245 etc.), Lentinus (Lentinus
edodes IFO 31866 etc.), the genus Crinipellis (Crinipellis st.
ripitaria IFO 30259). Among the wood rot fungi mentioned above, especially white rot fungi of basidiomycetes
Preferably, Phanerochaete sordida is used.

The microorganism used in the present invention is preferably cultured under conditions that enhance the ability to decompose dioxins. As a culture method for enhancing the resolution of dioxins described above, for example, basidiomycete white rot fungus Phanerochaete sord
ida was transferred to a low-concentration nitrogen medium (M. Tien and TK Kirk, Lign
in peroxidase of Phanerochaete chrysosporium, Meth
ods Enzymol. 161: 238-249, 1988).
A culture method of culturing at 7 ° C. for 7 days can be mentioned.
The dioxin decomposition-activating nutrient for microorganisms and the immobilizing agent are added to the culture solution and dissolved and mixed to produce a dioxin treating agent.

The above-mentioned dioxin decomposition-activating nutrients include compounds such as monosaccharides and polysaccharides. Such monosaccharides include monose,
Diose, triose, tetroses, pentoses, hexoses, heptose, octose, nonose, decorose, furanose, pyranose, septanose, glucose, saccharose, fructose, arabinose,
Examples include erythrose, ribose, mannose, sorbose, cyclodextrin, and the like, and phosphate esters of these monosaccharides or derivatives substituted with a substituent.

The polysaccharides used as the above-mentioned nutrients for activating and decomposing dioxins include starch, glycogen, caronine, laminaran, dextran, fructan, inulin, levan, mannan, elegans mannan, xylan, galacturonan, pectic acid, Mannuronan, alginic acid, guaran, konjac mannan, chondroitic acid, hyaluronic acid, meskit gum, gatch gum, gum arabic, and the like. Also,
The above-mentioned monosaccharides and polysaccharides can also be used as an appropriate mixture. It is preferable that these dioxin decomposition activating nutrients are added in an amount of 0.1% by weight to 25% by weight based on the solid content of the dioxin processing agent composition. The solid content includes microorganisms. At this time, as the dioxin degradation-activating nutrient, specifically, a nutrient added with glucose so as to have a final concentration of 1% by weight in the dioxin-treating agent composition can be mentioned.

Examples of the above-mentioned immobilizing agents include natural polymer materials such as starch, casein, gelatin, dextrin, acacia, pectin, polyacrylic acid, sodium polyacrylate, polyacrylamide, and the like.
Synthetic polymers such as polyethylene glycol, polyvinyl alcohol, acrylamide, polyvinylpyrrolidone, poly (styrene-ethylene oxide) block copolymer, graft copolymer such as poly (ethylene-vinyl alcohol) -g- (ethylene oxide), carboxymethyl cellulose, Examples thereof include water-soluble polymers such as methyl cellulose and viscose, and water-soluble polymers such as starch derivatives, and polymerizable monomers such as acrylamide, vinylpyrrolidone, and acrylic acid. These fixing agents are preferably added in an amount of 1% to 30% by weight, more preferably about 5% by weight, based on the solid content of the composition for treating dioxins used in the present invention. Is preferred. 1% by weight of immobilizing agent
If the amount is less than this, the incineration ash 4 cannot be sufficiently fixed, and if it is more than 30% by weight, the resolution of dioxins may not be sufficiently obtained.

In the composition for treating dioxins used in the present invention, metabolic components such as lignin for metabolizing wood rot fungi such as white rot fungi are appropriately dispersed or lignin is added as water-soluble. You can also put it. Similarly, nutrients such as a nitrogen source and a phosphorus source can be added to the dioxin treatment composition used in the present invention. Specific examples of such a nitrogen source include ammonium nitrate, ammonium chloride, sodium nitrate, ammonium sulfate, diammonium citrate,
And the like. Specific examples of the above-mentioned phosphorus source include dipotassium hydrogen phosphate, potassium dihydrogen phosphate, potassium monohydrogen phosphate, disodium monohydrogen phosphate, sodium dihydrogen phosphate, and the like.
The amount of the dioxin microorganism used in the present invention can be added to the dioxin treating agent composition so that the dioxin decomposition ability is at an appropriate rate.
Such rates include, for example, the rate at which PCDDs and PCDFs are degraded by about 50% to 70% in two weeks.

FIG. 4 shows a step 1 of the demolition method according to the present invention.
A first example of the step of circulating the dioxin-treating agent used in the step of attaching the dioxin-treating agent through the facilities of the incineration plant and attaching the dioxin-treating agent to the inner surfaces of the facilities of the incineration plant will be described. In FIG. 4, an incinerator 1, a cooling tower 2, a dust collector 3, and an ash pit 5
And a chimney 6 are connected by a circulation fan 7 and a duct 8 for connecting the respective facilities in order to shut off the purifying device of the present invention from the surrounding environment and prevent the dioxin compounds from scattering into the surrounding environment. Is shown. Furthermore, in the dismantling method of the present invention, a treatment agent supply tank 9 for supplying the above-mentioned dioxin treatment agent and a fixing agent for improving the fixation by polymerizing the above-mentioned fixing agent as required. And a polymerization agent supply tank 10 for supplying a polymerization agent for polymerizing the polymer. Examples of such a polymerizing agent include a cross-linking agent for cross-linking the above-described water-soluble polymer, a radical initiator capable of polymerizing the above-mentioned polymerizable monomer, and the like. In the treatment agent supply tank 9, an oxygen supply means, a temperature control means, and the like (not shown) may be used in order to allow microorganisms contained in the dioxin treatment agent of the present invention to survive and maintain the activity.

Step 102 in the dismantling method of the present invention
4, the duct 8 is connected to the circulation fan 7 from the top of the chimney 6 and further connected to the opening 11 of the incinerator 1 downstream of the circulation fan 7. Air is circulated between the top of the chimney 6 and the incinerator 1 as shown by arrows. A duct 8 is further connected to the other openings 12 and 13 of the incinerator 1, and the opening 12 is connected to the duct 8 through the circulation fan 7.
The opening 13 is connected to the openings 14 and 15 of the ash pit 5 by the duct 8. The opening 16 of the cooling tower 2 is connected to the opening 17 of the dust collector 3 by the duct 8 via the circulation fan 7, and the other opening 18 of the dust collector 3 is further connected to the chimney by the duct 8 via the circulation fan 7. 6 is connected to a flue port 19 provided below. By doing so, it becomes possible to completely shut off the purification device of the present invention from the surrounding environment, and the structure contaminated with dioxins can be removed without scattering the incinerated ash 4 contaminated with dioxins into the surrounding environment. It can be dismantled. The dust collector 3
If a bag filter is used for the printer, it is necessary to remove the bag filter in advance.

As shown in FIG. 4, in the dioxin treatment agent attaching step of step 102 in the disassembly method of the present invention, the treatment agent supply tank 9 and the polymerization agent supply tank 10 are further added.
A plurality of supply pumps P for supplying a dioxin-treating agent and a polymerizing agent from the above. These feed pumps P
It is connected to the processing agent supply tank 9 and the polymerization agent supply tank 10 through the upstream pipe 20, and further connected to the downstream pipe 20.
The dioxin treating agent and / or the polymerizing agent used as necessary, or both of them, are sent to a position adjacent to the circulation fan 7. The circulating fan 7 circulates air inside the incineration facility that is cut off from the surrounding environment by the duct 8, and circulates the dioxin treating agent, the polymerizing agent, or both of them by the circulating air flow. The dioxin treating agent containing the above-mentioned film-forming polymer substance as a microorganism and a fixing agent is supplied to the inner surface of each facility, and adheres to the inner surface of each facility. When supplying the dioxin-treating agent to the circulation fan 7, a spouting means for spouting the dioxin-treating agent may be provided adjacent to the circulation fan 7. Further, the air blowing capacity of the circulation fan 7 and the liquid sending capacity of the supply pump P can be appropriately set in consideration of the volume of the structure to which the present invention is applied.

FIG. 4 shows the incineration ash 4 deposited on the inner surface of each facility, and the dioxin treatment agent attached to the incineration ash 4 is shown as a coating 21. As described above, the dioxin-treating agent attaching step in step 102 in the dismantling method of the present invention may cover the incineration ash 4 with the coating 21 of the dioxin treating agent so that the dioxins do not scatter during the disassembling step. Alternatively, the dioxin treating agent may be attached to the extent that the incineration ash 4 is not scattered during the dismantling process without forming a coating.

FIG. 5 shows step 10 of the disassembly method of the present invention.
FIG. 2 is a diagram showing a case where a second embodiment of the dioxin treatment agent attaching step in FIG. 2 is applied to an incinerator 1 as an example. In FIG. 5, the incinerator 1 is described as an example, but it goes without saying that the dioxin-treating agent attaching step of the second embodiment of the present invention can be used for the cooling tower 2, the dust collector 3, and the like. . In the dioxin treatment agent adhering step shown in FIG. 5, first, as shown in FIG. 5 (a), equipment such as the incinerator 1 is sealed with a sealing member 22 such as an iron plate or a concrete plate to shut off equipment contaminated from the surrounding environment. I do. Next, an opening 25 is formed in the upper wall 24 at a position to be the center of the incinerator 1 for inserting the spraying device 23 for the dioxin treatment agent. Next, as shown in FIG. 5B, the spray device 23 is inserted through the opening 25. Then
As shown in FIG. 5C, the arm 26 provided at the end of the spray device 23 is moved in the horizontal direction, and the spray nozzle 27 provided at the tip of the arm 26 is opposed to the inner surface of the incinerator 1. Further, by turning the spray device 23 as shown by the arrow A, the spray nozzle 27 is turned, and the dioxin treatment agent is supplied from the treatment agent supply tank 9 and adheres to the inner surface of the incinerator 1.

When it is desired to improve the immobilization by the immobilizing agent, if necessary, the polymerizing agent is sprayed simultaneously with the dioxin treating agent from the spray nozzle 27 or after the dioxin treating agent is adhered to the inner wall. It is also possible to perform a heat treatment or the like by separately spraying a polymerization agent and providing a heating means or the like (not shown). At this time, the spray device 23 is
Is vertically moved as shown by arrow B while rotating as shown by arrow A. Further, the arm 26 has an arrow C
Since it is configured to be movable in the horizontal direction as shown by, it becomes possible to attach the dioxin treating agent over the entire inner surface regardless of the shape of the incinerator 1.

FIG. 6 is a diagram showing a partial cross section of the spraying device 23 used in the dismantling method of the present invention. FIG. 6 shows that the spraying device 23 used in the dismantling method of the present invention is inserted into the incinerator 1 through the opening 25 provided in the upper wall 24. The spraying device 23 has a holding member 28 for holding the spraying device 23 on the upper wall 24, bearing members 29a and 29b, a center hole jack 30 connected to the bearing member 29a, and various pipes. And a connecting pipe 31 for connecting a driving member (not shown) for rotating and driving. The bearing member 29b has a radially outer surface attached to the holding member 28 and a radially inner surface facing the center hole jack 30.
Is rotatably held, and constitutes a thrust bearing together with the bearing member 29a. Upper wall 2 of holding member 28
An anchor member 32 for firmly and detachably holding the spraying device 23 is inserted through a portion overlapping with 4, and the anchor member 32 is shown to extend to the upper wall 24.

FIG. 6 shows that a plurality of arms 26 are held by an arm holding member 33 at the tip of the center hole jack 30. The center hole jack 30 holds the arm 26 movably in the vertical direction. The arm holding member 33 is movably movable from the position shown in FIG. 5B extending vertically by an arm driving mechanism (not shown) to the horizontal position shown in FIGS. 5C and 6. Holding. FIG.
2 shows a cross section of the arm 26 with a part cut away. As shown in FIG. 6, the arm 26 is constituted by a jack, so that the spray nozzle 27 disposed at the end of the arm 26 on the side facing the inner surface of the incinerator 1 can be moved in the horizontal direction. As a result, the dioxin treating agent can be adhered to the entire inner surface of the incinerator 1. In FIG. 6, the number of the arms 26 is two. However, as long as the dioxin-treating agent or the like can be appropriately attached to the inner surface of the incinerator 1, any number of the arms 26 may be used as necessary. Can be used. Also,
Any jack can be used for the center hole jack 30 and the arm 26. Further, an arm driving mechanism (not shown)
Can be used as long as it can be moved from the vertical direction to the horizontal direction.

As shown in FIG. 6, a pipe such as a dioxin treating agent supply tube 34 is inserted into the spraying device 23 from the upper part of the connecting pipe 31. In addition, a hydraulic cable (not shown) is inserted through the spraying device 23 as necessary. The dioxin treatment agent supply tube 34 is further passed through the inside of the center hole jack 30 and then through the inside of the arm 26 to feed the dioxin treatment agent and the polymerization agent used as needed to the spray nozzle 27. Is to be supplied.

FIG. 7 shows the details of the spray member 35 attached to the arm 26. The spray member 35 shown in FIG.
Consists of a holding section 36 and a nozzle mounting section 37, and is held on the arm 26 by a stay 38 mounted on the holding section 36. As shown in FIG. 7, the stay 38 may be disposed near the distal end of the arm 26 so that the spray member 35 can swing with respect to the arm 26 in the direction of the arrow D around the stay 38. it can. By attaching in a swingable manner as described above, the adhesiveness of the dioxin treatment agent can be further improved. A plurality of spray nozzles 27 are attached to the nozzle mounting portion 37, and the spray nozzles 27 spray a dioxin-treating agent or the like toward the inner wall. This nozzle mounting portion 37
Is rotatably held by the holding unit 36, and sprays a dioxin-treating agent or the like in a mist while rotating the spray nozzle 27 in the direction of arrow E. As a mechanism for swinging the spray member 35 with respect to the arm 26 and a mechanism for rotatably holding the nozzle mounting portion 37, any conventionally known mechanism can be used.

Further, the disassembly method of the present invention will be described with reference to FIG. The disassembly method according to the present invention comprises the following steps 103
Move to the demolition process of the incineration plant. In the dismantling process of step 103, since the dioxin treatment agent is adhered to each inner surface of the incinerator 1, the cooling tower 2, the dust collector 3, and the ash pit 4 in step 102, a normal incineration plant dismantling process such as chipping is used. Can be dismantled. For the dismantling of the chimney 6, it is possible to use a conventional dismantling method such as filing or laying down. However, in order to ensure complete safety, unmanned using the wire sawing described in Japanese Patent Application No. 11-142503. It is preferable to use a chimney dismantling method. Further, not only the chimney 6 but also the incinerator 1 and the like can be dismantled by applying the dismantling method described in Japanese Patent Application No. 11-142503.

Further, a CCD camera (not shown) is attached to the holding portion 36 of the spraying device 23 used in the present invention, so that it is possible to remotely check the adhesion state while checking the image from the CCD camera. good. The attachment of the CCD camera to the holding portion 36 may be swingably attached or may be fixedly attached as long as the attachment state can be checked between the spray nozzles 27.
At this time, any conventionally known mounting method and means can be used.

Next, the dismantling method of the present invention uses the step of decomposing and detoxifying dioxins in step 104 in FIG. In the industrial waste obtained by cutting using wire sawing or the like, at this stage, dioxins are accumulated on the inner surface. Therefore, in step 104, the industrial waste is temporarily disassembled and detoxified in a storage site. To perform a decomposition and detoxification process. It is necessary to set environmental conditions such as temperature, humidity, pH, oxygen concentration, etc., in the storage for decomposing and detoxifying, which activate the resolution of dioxin-decomposing microorganisms. During this decomposition / detoxification treatment, the dioxin-decomposing microorganisms and the resolution-activating nutrients are sprayed according to the situation, and periodically (about once a week).
It is preferable to treat to the decomposition / detoxification target value while measuring the dioxin concentration.

After the disassembling and detoxifying step 104,
Concrete, bricks, reinforcing bars, and other members from which dioxins that have adhered and contaminated in the disposal step of Step 105 have been decomposed and made harmless are removed as ordinary waste after removing the dioxin-treating agent. May be reused. In addition, since the removed dioxin-treating agent contains incineration ash 4 adhered in the incineration facility, polymerized substances used as a fixing agent, and dioxin-decomposing microorganisms, the solidification treatment is performed. After reducing the weight, dispose as waste.

Although the present invention has been described by taking as an example the disassembly of each facility in an incineration plant, the present invention has been applied to the dioxin contamination which has already been released into the environment and its treatment is considered to be extremely difficult. As a prominent example such as soil, the present invention can be applied to purification of soil in and around an incineration plant. Dioxin contamination of soil is generally said to be only on the surface layer, so a dioxin treatment agent is sprayed on soil and the like, and the dioxin treatment agent is attached and fixed only on the surface layer, which is the contaminated part of the soil. The immobilized soil layer can be cut out and completely decomposed and detoxified by microorganisms in the storage for decomposition and detoxification.

EXAMPLES (A) Preparation of dioxin treating agent The dioxin treating agent used in the present invention had the following composition. i) White rot fungus Panerochaete sordida YK-624 ATCC90872 Predetermined amount ii) Polyethylene glycol 20% by weight iii) Glucose 1% by weight iv) Water balance

The dioxin treating agent having the above composition was produced by the following procedure. First, the white rot fungus Panerochae
te sordida YK-624 ATCC90872 in a low-concentration nitrogen medium (M.
n and TK Kirk, Lignin peroxidase of Phanerochae
te chrysosporium, MethodsEnzymol. 161: 238-249, 19
(88 years), culturing at 30 ° C. for 7 days, separating the culture solution, adding a glucose solution so that the concentration of glucose becomes 1% by weight with respect to the dioxin treating agent, and further adding a polyethylene glycol aqueous solution. Was slowly added so that the polymer solid content was 20% by weight.

(B) Treatment with dioxin-treating agent After the dioxin-treating agent obtained as described above is put into a sterilized atomizer, incineration ash collected from the inner wall surface of the incineration plant is placed on a glass plate. The incineration ash was sprayed with a dioxin treating agent by spraying to form a film of the dioxin treating agent on the incineration ash.

(C) Purification by Dioxin Treatment Agent The sample obtained as described above was treated at 30 ° C. in a thermostat at 2 ° C.
Saved for a week. Every three days, a solution of glucose and fresh bacteria was sprayed and supplied. Two weeks later, the concentration of dioxins in the incinerated ash treated with the dioxin treating agent was measured using a gas chromatograph with reference to the dioxin concentration in the incinerated ash before treatment, and the sample was treated with the dioxin treating agent. PCDDs and PCDF in samples
The concentration of s was reduced to about 50%. As described above, it has been found that dioxins can be purified using the film-forming dioxin treating agent of the present invention. In the above-described embodiment, the purification method of the present invention has been described using incineration ash placed on a glass plate. However, the present invention can be applied to the inner surface of incineration plant equipment or the soil around the incineration plant equipment as a contaminated area.

[0047]

According to the first aspect of the present invention, the incinerator facility contaminated with dioxins is cut off from the surrounding environment, and microorganisms having the ability to degrade dioxins and the film forming ability are formed on the inner surface of the incinerator facility. A method for dismantling a dioxin-contaminated structure is provided, which comprises disposing the incinerator facility and dissolving the dioxin-contaminated structure. The dioxin treatment agent is immobilized on the contaminated surface by the immobilization treatment, and the coating of the dioxin treatment agent is formed on the contaminated surface to prevent the dioxin from scattering and to spread the dioxin contamination to the surrounding environment. It is possible to provide a method of dismantling an environmentally harmful dioxin-adhered contaminated structure to be prevented.

According to the invention of claim 2 of the present invention, there is provided a dismantling method characterized in that the microorganism is a white rot fungus. After disintegration / removal work, dioxins are removed from the microorganism. It is possible to provide a safe and economical environment-friendly dismantling method for dioxin-adhered contaminated structures using the resolution of microorganisms by decomposing and detoxifying the waste and treating the waste after decomposition and detoxification. Becomes

According to the third aspect of the present invention, there is provided a dismantling method characterized in that the composition contains a nutrient activated by decomposition of dioxins, so that the decomposition of dioxins by microorganisms is further improved. It is possible to increase.

According to the invention of claim 4 of the present invention, there is provided a dismantling method characterized in that dioxins are decomposed by the microorganism after dismantling the incineration facility.
The scattering of dioxins can be prevented, and the spread of dioxin contamination to the surrounding environment can be prevented. Next, after dismantling and removing the structure, dioxins are decomposed and detoxified by microorganisms, and waste is treated after decomposition and detoxification. It is possible to provide a method of dismantling a type of dioxin-adhered contaminated structure.

According to the invention of claim 5 of the present invention, a dismantling method is provided in which the incineration facility is dismantled using wire sawing. Therefore, dioxin during dismantling of a structure is provided. The scattering of species can be further reduced.

According to a sixth aspect of the present invention, the disassembly method is characterized in that the composition is adhered by forming the composition into a mist and circulating the composition through the inner surface of the incineration plant. Is provided, so that the composition can be efficiently attached to the inner surface of the incineration plant.

According to the invention of claim 7 of the present invention, there is provided a dismantling method, wherein the composition is attached by spraying the composition on the inner surface of the incineration plant. Therefore, the composition can be efficiently attached to the inner surface of the incineration plant regardless of the shape of the inner surface of the incineration plant equipment.

According to the invention of claim 8 of the present invention, a composition comprising a microorganism capable of decomposing dioxins in a contaminated region contaminated with dioxins, a film-forming immobilizing agent, and a nutrient activated by dioxins. The method for purifying dioxins, which comprises decomposing the dioxins in the contaminated area by the microorganisms after attaching the substance, is provided. By performing waste treatment after chemical conversion, it is possible to provide a safe and economical environmentally harmful dioxin purification method utilizing the resolution of microorganisms.

According to the ninth aspect of the present invention, there is provided a method for purifying dioxins, wherein the contaminated area is an inner surface of an incineration plant. It is possible to provide an environmentally friendly dioxin purification method capable of safely and economically purifying pollution.

According to the tenth aspect of the present invention, there is provided a method for purifying dioxins, characterized in that the contaminated area is the soil around the incineration plant. An environment-friendly method for purifying dioxins that can safely and economically purify the contamination of surrounding soil with dioxins can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a dioxin generation mechanism in a garbage incineration process.

FIG. 2 is a diagram showing the treatment of dioxins in a garbage incineration process.

FIG. 3 is a flowchart showing a dismantling process of each facility of the incineration plant of the present invention.

FIG. 4 is a view showing a first embodiment for forming a coating film of a dioxin treating agent used in the dismantling method of the present invention.

FIG. 5 is a view showing a second embodiment for forming a coating film of a dioxin treating agent used in the dismantling method of the present invention.

FIG. 6 is a view showing a spray device used in the disassembly method of the present invention.

FIG. 7 is an enlarged view showing a spray member and an arm of a spray device used in the disassembly method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Incinerator 2 ... Cooling tower 3 ... Dust collector 4 ... Incineration ash 5 ... Ash pit 6 ... Chimney 7 ... Circulation fan 8 ... Duct 9 ... Treatment agent supply tank 10 ... Polymerizer tank 11-18 ... Opening 19 ... Flue mouth DESCRIPTION OF SYMBOLS 20 ... Piping 21 ... Coating 22 ... Sealing member 23 ... Sprayer 24 ... Upper wall 25 ... Opening 26 ... Arm 27 ... Spray nozzle 28 ... Holding member 29a, 29b ... Bearing member 30 ... Center hole jack 31 ... Connecting pipe 32 ... Anchor Member 33 ... Pivot member 34 ... Supply tube 35 ... Spray member 36 ... Holding part 37 ... Nozzle mounting part 38 ... Stay G ... Dust FA ... Fly ash EG ... Exhaust gas D ... Dioxins in dust ORG ... Organic compound CL ... Chlorine R: chemical reaction DN: de novo synthesis P: supply pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23J 3/00 B09B 3/00 ZABE 4D004 F Term (Reference) 2E176 AA00 DD22 2E191 BB00 BB01 BC01 BC05 BD20 3K061 QA09 3K065 BA01 BA10 HA05 4B065 AA71X AC20 BC46 CA56 4D004 AA31 AA36 AA41 AB07 AC07 CA01 CA02 CA19 CA29 CA45 CB04 CB44 CB50 CC01 CC07 CC08 CC11 CC15 DA02 DA06 DA08

Claims (10)

[Claims] An incinerator facility contaminated with dioxins is shut off from the surrounding environment, and a composition containing a microorganism capable of decomposing dioxins and a film-forming immobilizing agent is adhered to an inner surface of the incinerator facility. A method for dismantling a dioxin-contaminated structure, comprising dismantling the incineration facility. 2. The method according to claim 1, wherein the microorganism is a white rot fungus. 3. The dismantling method according to claim 1, wherein the composition contains a nutrient for activating dioxin decomposition. 4. The dismantling method according to claim 1, wherein the dioxins are decomposed by the microorganism after dismantling the incinerator facility. 5. The incineration plant is dismantled by wire sawing.
Dismantling method according to any one of the above. 6. The method according to claim 1, wherein the adhesion of the composition is performed by forming the composition into a mist and circulating the composition through an inner surface of the incineration plant. Demolition method. 7. The demolition method according to claim 1, wherein the adhesion of the composition is performed by spraying the composition on an inner surface of the incineration plant. 8. After adhering a composition containing a microorganism capable of decomposing dioxins, a film-forming immobilizing agent, and a nutrient capable of decomposing dioxins, to a contaminated region contaminated with dioxins, A method for purifying dioxins, comprising decomposing dioxins in the contaminated area. 9. The method for purifying dioxins according to claim 8, wherein the contaminated area is an inner surface of an incineration facility. 10. The method for purifying dioxins according to claim 8, wherein the contaminated area is the soil around incinerator facilities.