JP2003236493A - Method for detoxification treatment of pcb-containing transformer and system therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the detoxification treatment of a PCB-containing transformer in a relatively easy manner at a low cost, and a system therefor. <P>SOLUTION: The detoxification treatment system is equipped with an oil extraction apparatus 111 for extracting PCB1, a rough washing apparatus 112, a disassembling apparatus 113 for taking out a core 13, a cutting device 114 for separating the core 13 into an iron core 11 and a coil 12, a separator 120 for separating the coil 12 into a copper wire 3a and organic matter 2, a vacuum heater 115 for detoxifying the organic matter 2, an alkali treatment apparatus 131 for treating the surface of inorganic matter 3, a separator 132 for separating sludge 9 from an alkali solution 6, a vacuum heater 133 for detoxifying the sludge 9, an extraction transfer apparatus 134 for separating PCB1 from the alkali solution 6, a washing device 116 for detoxifying the inorganic matter 3 and a dechlorination treatment apparatus 140 for performing the dechlorination treatment of PCB1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detoxification method and system for detoxifying a PCB-containing transformer.

[0002]

2. Description of the Related Art In recent years, PCB (Polychlorinated bi
phenyl, polychlorinated biphenyl: a generic term for chlorinated isomers of biphenyl) is highly toxic and its manufacture and import are prohibited. Although this PCB was first manufactured in Japan around 1954, its adverse effects on the living body and environment became clear after the Kanemi Yusho incident.
In 2 years, there was a history of instructions to discontinue production and collection (duty of storage) by administrative guidance.

PCB has 1 to 1 chlorine in the biphenyl skeleton.
It has 0 substitutions, and theoretically there are 209 kinds of isomers depending on the number and position of the substituted chlorine.
About 100 or more isomers have been confirmed in CB products. In addition, the physical and chemical properties among these isomers, the in vivo stability, and the environmental dynamics are so diverse that the chemical analysis of PCB and the mode of environmental pollution are complicated at present. Further, PCB is one of the persistent organic pollutants, is not easily decomposed in the environment, is fat-soluble, has a high bioconcentration rate, and is semi-volatile, and is capable of being transferred through the atmosphere. In addition, it has been reported that it remains widely in the environment such as water and living things.

This PCB was an abandoned PC in 1997.
B, waste oil containing PCB, and PCB pollutants are designated as specially controlled wastes based on the law on waste treatment and cleaning. In addition, wood chips and fiber scraps were added as PCB pollutants in 1997. Designated.

[0005] Electrical equipment used as PCB processing products include high-voltage transformers, high-voltage capacitors, low-voltage transformers / capacitors, pole transformers, etc., and waste PCBs used as heat medium and insulating oil. There is. Currently, these are strictly stored, and urgent PCB treatment is desired. Therefore, in recent years, various techniques for processing PCBs used in such transformers have been developed, and for example, the technique described in Japanese Patent Laid-Open No. 9-79531 is known. FIG. 5 shows P according to the above proposal.
The flowchart of the processing method of CB is shown.

As shown in FIG. 5, first, oil is extracted from the transformer in which the PCB is enclosed (step S90).
1), PC attached inside by solvent cleaning
B is removed (step S902) and collected (step S903). The solvent after cleaning is decomposed together with the oil extracted from the transformer (step S904) and rendered harmless.

Next, the oil-removed transformer is dried to evaporate the PCB by heating at high temperature and normal pressure in the absence of oxygen (step S905) to prevent the PCB from scattering. Then, the transformer after drying is disassembled (step S906), and the case and the transformer core are separated. The case is provided as a scrap source for an electric furnace or a converter (step S907). On the other hand, the transformer core has its copper coil cut by a mobile shear or the like, and separated into a coil wire and an iron core (step S908).

The separated iron core is melted in the melting furnace and recovered (step S909). Further, the separated copper coil and the organic matter such as paper attached to the copper coil are melted in the induction heating furnace (step S910). Then, the molten copper is recovered, and the PCB gas generated in each melting furnace is
It is rendered harmless by high-temperature thermal decomposition at 1200 ° C. (step S911).

[0009]

In the conventional PCB processing method as described above, various metallic members are melted to form P.
Since the CB is decomposed, not only the equipment becomes large-scale, but also a large amount of heat energy is required, which increases the initial cost and the running cost.

In view of the above, it is an object of the present invention to provide a detoxification treatment method for a PCB-containing transformer and a system thereof which can relatively easily detoxify a PCB-containing transformer at low cost. .

[0011]

A method for detoxifying a PCB-containing transformer according to the first aspect of the present invention for solving the above-mentioned problems is a process for converting a PCB-containing transformer from a P-containing transformer.
A pretreatment step of collecting CB, a separation step of separating the pretreated transformer into an inorganic matter and an organic matter, and an organic matter detoxification step of performing a detoxification treatment of the separated organic matter,
An aqueous solution treatment step of treating the surface of the separated inorganic matter with a surface treatment aqueous solution consisting of an acid aqueous solution or an alkaline aqueous solution, a sludge separation step of separating sludge from the used surface treatment aqueous solution, and a detoxification treatment of the sludge A sludge detoxification step for carrying out, an aqueous solution / PCB separation step for separating and recovering PCB from the used surface treatment aqueous solution, an inorganic material detoxification step for detoxifying the surface-treated inorganic material, and the recovered And a dechlorination step of dechlorinating the PCB.

According to a second aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to the first aspect, wherein the pretreatment step is an oil draining step of draining PCB from the transformer, and the transformer draining PCB. The method is characterized in that a rough cleaning step of roughly cleaning is performed.

The method for detoxifying a PCB-containing transformer according to a third aspect of the present invention is the method according to the first or second aspect of the present invention, wherein the separating step includes a disassembling step of taking out a core from the transformer and cutting the core. It is characterized by performing a cutting step of separating the core into a coil and a coil, and a separation step of separating the cut coil into a copper wire and an organic substance.

The method for detoxifying a PCB-containing transformer according to a fourth aspect of the present invention is the method according to the third aspect, wherein the separating step separates the copper wire of the coil from the organic matter by a difference in specific gravity in water. Water / P for separating and recovering PCB from the water used in the separation step and the wet separation step
And a CB separation step.

The method for detoxifying a PCB-containing transformer according to a fifth aspect of the present invention is the method of the fourth aspect, wherein the water / PCB separation step transfers the PCB in the water to an extraction solution or the water. It is characterized by performing a membrane separation step of membrane-separating the PCB.

According to a sixth aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to any one of the first to fifth aspects, wherein the step of detoxifying an organic matter is a vacuum heating step of an organic matter for vacuum-heating the organic matter. And at least one of the organic substance cleaning steps of cleaning the organic substance with a cleaning liquid.

According to a seventh aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to any one of the first to sixth aspects, wherein the sludge detoxification step is a sludge vacuum heating step of vacuum heating the sludge. And at least one of a sludge cleaning step of cleaning the sludge with a cleaning liquid.

The method for detoxifying a PCB-containing transformer according to an eighth aspect of the present invention is the method according to any one of the first to seventh aspects, wherein the aqueous solution / PCB separation step extracts PCB in the aqueous surface treatment solution. It is characterized by performing an extraction transfer step of transferring to a liquid or a membrane separation step of separating the PCB in the surface-treated aqueous solution into a membrane.

According to a ninth aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to any one of the first to eighth aspects, wherein the step of detoxifying the inorganic material is a step of heating the inorganic material by vacuum heating. And at least one of the inorganic substance cleaning steps of cleaning the inorganic substance with a cleaning liquid.

In order to solve the above-mentioned problems, the detoxification treatment system for a PCB-containing transformer according to the tenth aspect of the present invention includes a pretreatment means for collecting the PCB from the PCB-containing transformer and a pretreatment. Separation means for separating the trans into inorganic matter and organic matter, organic matter detoxification means for detoxifying the separated organic matter, and the surface of the separated inorganic matter is treated with an aqueous surface treatment solution or an aqueous alkaline solution. An aqueous solution treatment means for treating,
Sludge separation means for separating sludge from the used surface treatment aqueous solution, sludge detoxification means for detoxifying the sludge, and aqueous solution / PCB separation means for separating and recovering PCB from the used surface treatment aqueous solution And a dechlorinating means for dechlorinating the collected PCB, and an inorganic detoxifying means for detoxifying the surface-treated inorganic material.

A detoxification processing system for a PCB-containing transformer according to the tenth aspect of the invention is as follows.
The pretreatment means is provided with an oil removing means for removing the PCB from the transformer and a rough cleaning means for roughly cleaning the transformer from which the PCB has been removed.

A detoxification treatment system for a PCB-containing transformer according to a twelfth aspect of the present invention is the system for detoxifying a PCB according to the tenth aspect or the tenth aspect, wherein the separating means removes the core from the transformer and the core. It is characterized by comprising cutting means for cutting and separating the iron core and the coil, and separating means for separating the cut coil into a copper wire and an organic substance.

A detoxification treatment system for a PCB-containing transformer according to the thirteenth invention is the twelfth invention, wherein the separating means separates the copper wire of the coil from the organic matter by a difference in specific gravity in water. And a water / PCB separation means for separating and recovering PCB from the water used in the wet separation means.

A detoxification treatment system for a PCB-containing transformer according to a fourteenth aspect of the invention is, in the thirteenth aspect, the water / PCB separation means for transferring the PCB in the water to an extraction liquid or an extraction transfer means. PCB in the water
It is characterized by comprising a membrane separating means for separating the membrane.

According to a fifteenth aspect of the present invention, there is provided a system for detoxifying a PCB-containing transformer according to any one of the tenth to fourteenth aspects, wherein the means for detoxifying an organic substance vacuum-heats the organic substance. At least one of a heating means and an organic material cleaning means for cleaning the organic material with a cleaning liquid is provided.

A detoxification treatment system for a PCB-containing transformer according to a sixteenth invention is the sludge detoxification means according to any one of the tenth to fifteenth inventions.
At least one of a sludge vacuum heating means for heating the sludge in vacuum and a sludge cleaning means for cleaning the sludge with a cleaning liquid is provided.

A detoxification treatment system for a PCB-containing transformer according to a seventeenth invention is the method according to any one of the tenth to sixteenth inventions, wherein the aqueous solution / PCB separating means is a PCB in the aqueous solution for surface treatment. It is characterized in that it is provided with an extraction transfer means for transferring the above to an extraction liquid or a membrane separation means for separating the PCB in the surface treatment aqueous solution into a membrane.

A detoxification treatment system for a PCB-containing transformer according to an eighteenth invention is the inorganic detoxification means according to any one of the tenth to seventeenth inventions, wherein the inorganic matter detoxifying means vacuum heats the inorganic matter. At least one of a vacuum heating means and an inorganic material cleaning means for cleaning the inorganic material with a cleaning liquid is provided.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a method for detoxifying a PCB-containing transformer and its system according to the present invention.
This will be described with reference to 4. 1 is a schematic configuration diagram of a detoxification treatment system for a PCB-containing transformer, FIG. 2 is a schematic configuration diagram of a separation device, FIG. 3 is a schematic configuration diagram of a surface treatment device, and FIG.
FIG. 3 is a schematic structural diagram of a transformer. The present invention is not limited to the embodiments described below.

"Transformer Structure" First, the schematic structure of the PCB-containing transformer will be described with reference to FIG.

As shown in FIG. 4, the transformer 10 comprises a transformer core 1 in which a copper coil 12 is wound around an iron core 11.
3 is housed in a container 14 made of iron, and PCB oil 1 is enclosed therein as insulating oil. The coil 12 has a structure in which an insulating paper is wound around a copper wire, and an insulator 18 is provided on an upper portion of the iron frame 17. The opening of the container 14 is sealed by the lid 19. A typical transformer has a capacity range of 5 to 100 kVA, and the present invention can process in all ranges.

[Detoxification Processing System] Next, a schematic configuration of a detoxification processing system for a PCB-containing transformer according to the present embodiment will be described with reference to FIGS.

As shown in FIGS. 1 to 3, the PCB-containing transformer detoxification processing system according to the present embodiment includes an oil removing device 111 for extracting the PCB 1 from the transformer 10.
A rough cleaning device 112 for roughly cleaning the transformer 10 from which the PCB 1 has been removed, a disassembling device 113 for taking out the core 13 from the transformer 10, a cutting device 114 for cutting the core 13 to separate the core 11 and the coil 12, and a cutting device. A separation device 120 for separating the separated coil 12 into a copper wire 3a and an organic substance 2 such as insulating paper, and an organic substance detoxifying means for detoxifying the organic substance 2 by heating the separated organic substance 2 in a vacuum. An organic substance vacuum heating device 115 and an alkali treatment device 131 which is an aqueous solution treatment means for treating the surfaces of the separated containers 14, the lid 19 and the inorganic substance 3 such as the iron core 11 with the alkaline solution 6 which is a surface treatment aqueous solution were used. Sludge separator 132 for separating sludge 9 from alkaline solution 6, and detoxifying sludge 9 by heating sludge 9 in vacuum Sludge vacuum heating apparatus 133 is sludge detoxification means for performing, alkaline solution 6 was used
Extraction transfer device 134 which is an aqueous solution / PCB separation means for separating and recovering PCB1 from the alkaline solution 6 by transferring PCB1 in the extraction liquid 5 and the inorganic substance 3 by cleaning the surface-treated inorganic substance 3 with the cleaning liquid 4. Inorganic substance cleaning device 1 which is an inorganic substance detoxifying means for detoxifying
16 and a dechlorination treatment device 140 for dechlorinating the collected PCB1.

As shown in FIG. 2, the separating device 120.
Is a wet separation device 121 that separates the copper wire 3a of the coil 12 and the organic matter 2 by a specific gravity difference in water 7.
Extraction transfer device 122, which is a water / PCB separation means for separating and recovering PCB1 from water 7 by transferring PCB1 in water 7 used in wet separation device 121 to extraction liquid 5.
It has and.

The wet separation device 121 comprises the device main body 12
1a, a collection box 121b made of wire mesh for receiving the water 7 and the organic matter 2 separated from the copper wire 3a, and a collection tank 121c holding the collection box 121b.

The extraction transfer device 122 includes an extraction tank 122a for receiving the water 7 from the recovery tank 121c of the wet separation device 121, an extraction liquid supply device 122b for supplying the extraction liquid 5 into the extraction tank 122a, and an extraction tank. An agitating blade 122c provided inside 122a, a three-way valve 122d connected to the lower part of the extraction tank 122a, and an inlet main body 121a of the wet separation device 121 with an inlet connected to one of the remaining ports of the three-way valve 122d. Feed pump 122e having a delivery port connected to
It has and.

Further, as shown in FIG. 3, the alkaline processing apparatus 131 has a mesh-shaped processing casing 131a for holding the inorganic substance 3 and a processing tank 131 for holding the processing casing 131a.
b and a stirring blade 131 provided inside the processing tank 131b
c and a valve 131 connected to the lower part of the processing tank 131b
and d.

The sludge separating device 132 has a valve 13 in the treatment tank 131b of the alkali treating device 131.
It is connected via 1d.

The sludge vacuum heating device 133 has a processing tank 133a for internally holding the sludge 9 separated by the sludge separating device 132, a vacuum pump 133b for sucking the inside of the processing tank 133a, a processing tank 133a and a vacuum pump 133b. And an activated carbon tank 133c provided between the heating tank 133c and a heater 133d for heating the inside of the processing tank 133a to a high temperature.

The extraction transfer device 134 includes an extraction tank 134a for receiving the alkaline solution 6 separated by the sludge separation device 132, an extraction liquid supplier 134b for supplying the extraction liquid 5 into the extraction tank 134a, and an extraction tank 134a. A stirring blade 134c provided inside, a three-way valve 134d connected to the lower portion of the extraction tank 134a, an adjusting tank 134e connected to one of the remaining ports of the three-way valve 134d, and an adjusting tank 134e
Alkaline stock solution feeder 1 for supplying alkaline stock solution 6a
34f, a water source (not shown) for supplying water 7 into the adjusting tank 134e, and a stirring blade 134 provided in the adjusting tank 134e.
g and a valve 134 connected to the bottom of the adjusting tank 134e.
h, and a feed pump 134i whose inlet is connected to the valve 134h and whose outlet is connected to the processing tank 131b of the alkaline processing apparatus 131.

The dechlorination apparatus 140 can replace the chlorine group of PCB1 with a hydrogen group or a hydroxyl group to render PCB1 harmless.

In the present embodiment, the oil removing device 11
1. The rough cleaning device 112 and the like constitute a pretreatment means for collecting the PCB1 from the transformer 10 containing the PCB1, and the dismantling device 113, the cutting device 114, and the separating device 120 are provided.
And the like constitute a separating means for separating the pretreated transformer 10 into the inorganic substance 3 and the organic substance 2, and the surface treatment is performed by the alkali treatment device 131, the sludge separation device 132, the sludge vacuum heating device 133, the extraction transfer device 134, and the like. The device 130 is configured.

[Detoxification Processing Method] Next, a detoxification processing method using the above-described detoxification processing system will be described.

[Reception of Transformer] The transformer 10 is put in a transport container so that the PCB 1 does not leak to the outside and transported to a predetermined location. The transformer 10 is placed on a workbench by a crane or the like and carried into a shielded space such as a glove box. Then, the process is performed in the glove box. At this time, negative pressure is applied to the inside of the glove box to prevent scattering of the PCB to the outside and direct PCB contamination to the work environment. Further, it is possible to perform the work by remote control or an automatic robot so that the PCB is not directly attached to the worker.

[Pretreatment Step] <Oil Removing Step> Next, a hole having a predetermined diameter is made in the lid 19 of the transformer 10 by a drill or the like, and the oil removing device 111 sucks the hole from the hole, so that the PCB 1 is removed from the inside of the transformer 10. (Insulating oil) is extracted and collected. Here, when the PCB 1 has a high viscosity, it is possible to reduce the viscosity by heating or the like to facilitate the extraction. It is also possible to remove the lid 19 instead of making the holes.

<Rough Cleaning Step> Subsequently, the cleaning liquid 4 is forcibly injected into the container 14 of the transformer 10 by the rough cleaning device 112 to perform the rough cleaning of the transformer 10 to reduce the adhesion level of the PCB 1. At this time, the cleaning efficiency can be improved by using an ultrasonic oscillator or the like. As the cleaning liquid 4 to be used, the cleaning liquid 4 (waste cleaning liquid) used in the inorganic substance cleaning step described later is used. Further, the cleaning liquid 4 (waste rough cleaning liquid) used in this step is distilled, refined and separated for reuse, while the residual concentrate 4a is dechlorinated together with the recovered PCB1.

Here, examples of the cleaning liquid 4 include organic solvents such as benzene, toluene, xylene, acetone, hexane, isooctane, trichloroethylene and tetrachloroethylene.

This rough cleaning step can be omitted if necessary, but since the PCB adhering container moves inside the PCB processing facility, if it is desired to minimize the concentration of PCB scattered in the working environment, It is desirable to provide this rough cleaning step.

Pretreatment steps such as the oil removing step and the rough cleaning step are performed inside the shielded space such as a glove box.

[Separating Step] <Disassembling Step> Next, using the disassembling apparatus 113 equipped with various tools such as an impact wrench, the lid attaching tool of the transformer 10 is removed, and the lid 19 is removed. Here, when the PCB concentration in the container 14 is high, it is possible to further perform vacuum heat treatment. In this case, the container 14 with the lid 19 removed is placed in a vacuum heating device and heated under vacuum to evaporate the PCB 1 remaining inside the container 14 and reduce the amount of adhesion. . At this time, the organic matter 2 such as paper or wood in the transformer 10 can be carbonized first, and the handling operation in a later step can be facilitated.

Here, vacuum heating is performed at 200 ° C. to 600 ° C.
The temperature is preferably about 3 to 12 hours, preferably in an environment in which the pressure is replaced with an inert gas and the pressure is reduced to atmospheric pressure or lower. The vacuum heating here can be omitted.

Further, using the disassembling device 113, the transformer 30 is provided with a core 13 containing an organic substance such as paper or wood, a metal other than the core 13 (a container 14, a lid 19, an iron frame 17, etc.), an insulator 18, etc. Separate and dismantle. The portion fixed by welding is separated by cutting.

<Cutting Step> Next, the core 13 is cut using a cutting device 114 equipped with a hydraulic cutter, a band saw machine, a water jet, a laser cutter, etc.
And the coil 12. Here, it is preferable to use a hydraulic cutter as the cutting device 114 because processing can be performed in a short time and generation of chips is small. Also,
It is more preferable because it is not necessary to use cutting oil at the time of cutting as in the case of a band saw cutter. Furthermore, since the coil 12 contains paper or wood contaminated by the PCB 1, the coil 12 is cut into pieces by a cutting device 114 such as a biaxial shearing mill.

<Separation Step> Subsequently, the coil 12 which is divided and crushed and cut is separated into the organic substance 2 such as paper or wood and the copper wire 3a by using the separating device 120.

<< Wet Separation Step >> Specifically, the coil 12
The crushed pieces of No. 2 are put into the apparatus main body 121a of the wet separation apparatus 121 of the separation apparatus 120, and the water 7 is caused to flow while applying vibration, so that the organic matter 2 having a low specific gravity is collected together with the water 7 in the collection casing 121b. The copper wire 3a having a large specific gravity is precipitated in the water 7 and collected.

<< Water / PCB Separation Step >>"Extraction Transfer Step" The water 7 is fed from the recovery tank 121c into the extraction tank 122a of the extraction transfer device 122, and from the extraction liquid supply device 122b into the extraction tank 122a. The extracted liquid 5 is mixed and stirred by the stirring blade 122c, and the PCB 1 contained therein is extracted and transferred to the liquid extract 5. After that, when the stirring blade 122c is stopped and allowed to stand still, the water 7 and the extraction liquid 5 are separated, so by operating the three-way valve 122d, the water 7 is sent to the apparatus main body 121a of the wet separation apparatus 121 by the pump 122e. It is re-fed through and reused, and the extract 5 is recovered. The recovered extract liquid 5 (waste extract liquid) is distilled, purified, separated, and reused, while the residual concentrate 5a is collected PCB.
It is dechlorinated together with 1.

According to such a wet separation method, exhaust gas is not generated and the treatment can be easily performed, which is preferable.

Here, as the extract liquid 5, it is preferable to use one having a high partition coefficient of PCB1 in combination with water 7, and for example, n-hexane and the like can be mentioned.

[Organic matter detoxifying step] <Organic matter vacuum heating step> Next, the organic matter vacuum heating device 115 is used for treating the organic matter 2 such as paper or wood separated in the disassembling step and the separating step.
PC contained in organic substance 2 by heating in vacuum at
B1 is decomposed and at the same time, organic matter 2 is carbonized to render it harmless and disposed of.

[Surface treatment process] On the other hand, the metal such as the container 14 and the lid 19 and the insulator 18 from the disassembling process, the iron core 11 from the cutting process, the inorganic material 3 such as the copper wire 3a from the separating process, etc.
Is sent to the surface treatment device 130 and subjected to a surface treatment so that the PCB 1 invading the minute gaps such as rust can be easily removed.

<Aqueous solution treatment step> Specifically, the inorganic substance 3 is put in the treatment casing 131a of the alkali treatment apparatus 131, and the treatment casing 131a is placed in the treatment tank 131b.
When the alkaline solution 6 is supplied into the processing tank 131b and stirred by the stirring blade 122c, rust or the like on the surface of the inorganic material 3 is peeled off, and gaps such as minute cracks on the surface of the inorganic material 3 are reduced. This facilitates the cleaning process of the inorganic material 3.

<Sludge Separation Step> When the surface treatment of the inorganic substance 3 is performed in this manner, the sludge 9 is gradually deposited in the treatment tank 131b. Therefore, after the surface treatment of the predetermined amount of the inorganic substance 3 is performed, the alkali treatment is performed. The valve 131d of the device 131 is opened to feed the sludge 9 together with the alkaline solution 6 from the inside of the treatment tank 131b to the sludge separating device 132 to separate the sludge 9.

<Sludge detoxification step><< Sludge vacuum heating step >> Subsequently, separated sludge 9
Is placed in the treatment tank 133a of the sludge vacuum heating device 133, the vacuum pump 133b is operated to make the inside of the treatment tank 133a under a reduced pressure environment, and the heater 133d is operated to heat the inside of the treatment tank 133a. The PCB 1 attached to the sludge 9 is decomposed to make the sludge 9 harmless. The treated sludge 9 is discarded.

Here, vacuum heating is performed at 200 ° C. to 600 ° C.
The temperature is preferably about 3 to 12 hours, preferably in an environment in which the pressure is replaced with an inert gas and the pressure is reduced to atmospheric pressure or lower.

<Aqueous Solution / PCB Separation Step><< Extraction Transfer Step >> The alkaline solution 6 from the sludge separation device 132 is fed into the extraction tank 134a of the extraction transfer apparatus 134, and from the extraction liquid supply device 134b to the extraction tank 134.
The PC contained in the inside of the a is mixed and stirred by the stirring blade 134c with the extract liquid 5 such as hexane supplied to the inside.
B1 is extracted and transferred to the extraction liquid 5. Then, the stirring blade 13
4c is stopped and left to stand, the alkaline solution 6 and the extract 5
Is separated, by operating the three-way valve 134d, the alkaline solution 6 is fed to the adjusting tank 134e, and the water 7 is supplied from the water source into the adjusting tank 134e while operating the stirring blade 134g. Stock solution feeder 13
The alkaline stock solution 6a is supplied from 4f, and the alkaline solution 6 is adjusted to have a specified concentration. The adjusted alkaline solution 6 is used in the processing tank 131 of the alkaline processing apparatus 131.
It is fed into b through the feeding pump 134i and used again. The recovered extract 5 (waste extract) is distilled, purified, separated, and reused, while the residual concentrate 5a is dechlorinated together with the recovered PCB1.

[Inorganic substance detoxification process] <Inorganic substance cleaning process> The inorganic substance 3 surface-treated in the above-mentioned surface treatment process is placed in a cleaning case made of wire mesh, placed in a cleaning tank, and immersed in the cleaning liquid 4. By doing so, the PCB1 adhering to the surface is washed and removed to be rendered harmless.
At this time, it is possible to improve the cleaning efficiency by using an ultrasonic oscillator or rotating the cleaning casing. Further, it is preferable that this cleaning is repeated a plurality of times depending on the degree of contamination of the inorganic substance 3 or that the type of the cleaning liquid 4 is appropriately combined.

Prior to this cleaning, the iron core 11 has a structure in which steel plates are laminated. Therefore, by crushing the iron core 11 by the biaxial shearing crushing machine or the like, the PCB 1 that has penetrated into the laminated portion of the iron core 11 is crushed. It is preferable to enable efficient cleaning. In addition, when resin such as varnish is applied to the iron core 11, if the iron core 11 is cut with a large hydraulic cutting machine, the laminate is deformed at the time of cutting.
Is more preferable because it can be easily peeled one by one for each steel plate.

The washed inorganic substance 3 is reused or discarded. In addition, the cleaning liquid 4 (waste cleaning liquid) after use is
It is used as a cleaning liquid in the rough cleaning step.

[Dechlorination Step] Starting from PCB1 from the oil removal step, the distillation concentrate from the rough cleaning step and the like is subjected to dechlorination processing by the dechlorination apparatus 140 to obtain PC.
B1 is detoxified by replacing the chlorine group with a hydrogen group or a hydroxyl group.

Specifically, for example, metallic sodium powder (diameter: about 5 to 10 μm) is dispersed (10 wt) in insulating oil.
%) Metal Sodium Dispersion (Sodium Dispers
ion: SD) is slowly dropped (about 1 hour) in the temperature range of 50 to 70 ° C. into the above-mentioned PCB1 or distillation concentrate under a nitrogen atmosphere, and after stirring, stirring is continued for a while (about (About 1 hour) After completing the dechlorination reaction,
Quench water is added dropwise to hydroxylate the remaining sodium metal. By the above reaction, biphenyls, sodium chloride and sodium hydroxide are mainly produced, biphenyls are dissolved in the insulating oil, and sodium chloride and sodium hydroxide are dissolved in the quench water, so that an aqueous layer and an oil layer are formed. Only the liquid consisting of two layers remains. Hydrochloric acid is added to the water layer for neutralization, and then drainage is performed, and the oil layer is incinerated.

That is, in the present invention, when dechlorinating PCB1 with a treatment agent that dislikes water, such as metallic sodium, it is necessary to ensure that PCB1 is removed from each member of transformer 10 so that PCB1 does not mix with water 7. I made it possible to separate them.

Therefore, it becomes possible to decompose the PCB1 by applying the dechlorination method which can be carried out by an apparatus having a relatively simple structure.

Therefore, according to the present invention, the conventional PC
As in the B treatment method, various metallic members are melted to form P
Since it is not necessary to disassemble the CB1, it is possible to suppress an increase in the size of equipment and also to suppress necessary heat energy. Therefore, the transformer 10 containing the PCB1 can be relatively easily produced at low cost and harmlessly. Can be processed.

[Other Embodiments] [Wet Separation] In the present embodiment, the crushed pieces of the coil 12 are thrown in and the water 7 is caused to flow while vibrating, so that the organic matter 2 having a low specific gravity is washed with water. While the wet separation device 121 is used in which the copper wire 3a having a high specific gravity is precipitated in the water 7 and collected while being collected together with the sample 7, as another embodiment, for example, a crushed piece of the coil 12 is contained in the water 7. It is also possible to apply a wet separation means in which the organic substance 2 and the copper wire 3a are put into a sieve and the sieve is vibrated to separate the organic matter 2 and the copper wire 3a.

[Dry Separation] Further, in the present embodiment, the wet separation device 121 for separating the organic matter 2 and the copper wire 3a by utilizing the difference in specific gravity in the water 7 is applied, but as another embodiment, , For example, the crushed pieces of the coil 12 are put inside the sieve, and the air is blown from below the sieve while vibrating the sieve,
It is also possible to apply a dry separation means for separating the organic substance 2 and the copper wire 3a by blowing off the organic substance 2 having a low specific gravity from the sieve and collecting the organic substance 2. At this time, in the organic matter 2 separated by the wind force, fine particle components are separated by a cyclone or the like and collected by a bag filter or the like.

[Water / PCB Separation] In this embodiment, PCB1 existing in the water 7 used for wet separation is extracted with the extraction liquid 5 to separate the PCB1 from the water 7. , As another embodiment, water 7 to P
It is also possible to use a membrane separation means such as a microfiltration membrane (MF membrane) or an ultrafiltration membrane (UF membrane) for separating CB1 so as to carry out the membrane separation step of circulating the water 7 through the membrane separation means. is there.

[Detoxification of organic matter] In the present embodiment, the organic matter 2 such as paper or wood separated in the disassembling process or the separating process is used.
By vacuum-heating the organic substance in the organic substance vacuum heating device 115, the PCB 1 contained in the organic substance 2 is decomposed and the organic substance 2 is carbonized to be detoxified.
As another embodiment, for example, similarly to the case of the inorganic material 3, the organic material 2 is cleaned with the cleaning liquid 4 by using the organic material cleaning means for cleaning the organic material 2 with the cleaning liquid 4, and the PCB 1 attached to the organic material 2 is cleaned. It is also possible to perform an organic substance cleaning step of removing the organic substance 2 from the organic substance 2 or to perform both the vacuum heating step and the cleaning step by using both the vacuum heating device 115 and the cleaning means.

[Detoxification of Sludge] In the present embodiment, the separated sludge 9 is replaced with the sludge vacuum heating device 133.
The PCB 1 adhering to the sludge 9 is decomposed by being vacuum-heated in order to make the sludge 9 harmless. However, as another embodiment, for example, as in the case of the inorganic substance 3, the sludge is The sludge cleaning means for cleaning 9 with the cleaning liquid 4 is used to clean the sludge 9 with the cleaning liquid 4, and the sludge cleaning step of removing the PCB 1 adhering to the sludge 9 from the sludge 9 is performed, or the vacuum heating device is used. It is also possible to perform both the vacuum heating step and the cleaning step by using both 133 and the cleaning means. The sludge cleaning means may also serve as the inorganic material cleaning means, and the cleaning of the sludge 9 and the cleaning of the inorganic material 3 may be performed together.

[Aqueous Solution / PCB Separation] In the present embodiment, the alkaline solution 6 used for the surface treatment of the inorganic material 3 is used.
Although PCB1 present in the solution is extracted with the extraction solution 5 to separate the PCB1 from the alkaline solution 6, as another embodiment, for example, a microfiltration membrane (MF) for separating the PCB1 from the alkaline solution 6 is used. Membrane), ultrafiltration membrane (UF membrane)
It is also possible to carry out the membrane separation step of separating the PCB 1 from the alkaline solution 6 by circulating the solution into the membrane separation means.

[Detoxification of Inorganic Material] In the present embodiment, the inorganic material 3 is cleaned with the cleaning liquid 4 so that the PCB 1 adhering to the surface of the inorganic material 3 is removed by cleaning. As another embodiment, for example, by performing vacuum heating of the inorganic material 3 by the inorganic material vacuum heating means, an inorganic material vacuum heating step of decomposing the PCB 1 attached to the inorganic material 3 is performed, or the inorganic material cleaning means and the inorganic material It is also possible to use both the vacuum heating means and the inorganic substance cleaning step and the inorganic substance vacuum heating step.

[Surface Treatment Aqueous Solution] Further, in this embodiment, the alkaline solution 6 is used as the surface treatment aqueous solution, but an acid aqueous solution may be applied.

[0082]

The method for detoxifying a PCB-containing transformer according to the first aspect of the present invention comprises a pretreatment step of recovering the PCB from the PCB-containing transformer and separating the pretreated transformer into an inorganic substance and an organic substance. A separation step, an organic matter detoxification step for detoxifying the separated organic matter, and an aqueous solution treatment step for treating the surface of the separated inorganic matter with a surface treatment aqueous solution consisting of an acid solution or an alkaline solution, A sludge separation step of separating sludge from the surface treatment aqueous solution, a sludge detoxification step of detoxifying the sludge, and an aqueous solution / PCB separation step of separating and recovering PCB from the used surface treatment aqueous solution, Inorganic substance detoxification process for detoxifying the surface-treated inorganic substance, and dechlorination process for dechlorinating the recovered PCB Since performing the steps, conventional PC
As in B processing, various metallic members are melted to produce PCB
Since it is not necessary to disassemble the equipment, it is possible to suppress the increase in the size of the equipment and also to suppress the necessary heat energy, so that the transformer containing the PCB can be relatively easily detoxified at low cost. can do.

The method for detoxifying a PCB-containing transformer according to a second aspect of the present invention is the method according to the first aspect, wherein the pretreatment step is an oil draining step of draining PCB from the transformer and the transformer draining PCB. Since the rough cleaning step of roughly cleaning the substrate is performed, the recovery rate of PCB from the transformer can be increased, and the processing in the subsequent step can be facilitated.

The method for detoxifying a PCB-containing transformer according to the third aspect of the present invention is the method according to the first or second aspect of the present invention, wherein the separating step includes a dismantling step of taking out a core from the transformer and cutting the core. Since the cutting step of separating the core into a coil and the coil and the separation step of separating the cut coil into a copper wire and an organic substance are performed, the transformer can be reliably separated into an organic substance and an inorganic substance.

The method for detoxifying a PCB-containing transformer according to a fourth aspect of the present invention is the method according to the third aspect, wherein the separation step is a wet process in which the copper wire of the coil and the organic matter are separated by a difference in specific gravity in water. Water / P for separating and recovering PCB from the water used in the separation step and the wet separation step
Since the CB separation step is performed, the copper wire and the organic matter can be easily separated, and the PCB that has been transferred to water can be surely recovered and the dechlorination treatment can be performed.

A method for detoxifying a PCB-containing transformer according to a fifth aspect of the invention is the method of the fourth aspect, wherein the water / PCB separation step transfers the PCB in the water to an extraction liquid or the water. Since the membrane separation step for membrane-separating the PCB is performed, the PCB can be easily recovered from the water.

The method for detoxifying a PCB-containing transformer according to a sixth aspect of the present invention is the method for detoxifying an organic matter according to any one of the first to fifth aspects, wherein the step of detoxifying the organic matter is a vacuum heating step for heating the organic matter under vacuum. Since at least one of the organic substance cleaning step of cleaning the organic substance with the cleaning liquid is performed, the PCB can be easily and surely removed from the organic substance.

According to a seventh aspect of the present invention, there is provided a method of detoxifying a PCB-containing transformer according to any one of the first to sixth aspects, wherein the sludge detoxification step is a sludge vacuum heating step of vacuum heating the sludge. Since at least one of the sludge cleaning step of cleaning the sludge with the cleaning liquid is performed, the PCB can be easily and surely removed from the sludge.

According to an eighth aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to any one of the first to seventh aspects, wherein the aqueous solution / PCB separation step extracts PCB in the surface-treated aqueous solution. Since the extraction transfer step of transferring to the liquid or the membrane separation step of performing the membrane separation of the PCB in the surface treatment aqueous solution is performed, the PCB from the surface treatment aqueous solution
Can be easily recovered.

According to a ninth aspect of the present invention, there is provided a method for detoxifying a PCB-containing transformer according to any one of the first to eighth aspects, wherein the step of detoxifying the inorganic material is a step of heating the inorganic material by vacuum heating. Since at least one of the inorganic substance cleaning step of cleaning the inorganic substance with the cleaning liquid is performed, the PCB can be easily and surely removed from the inorganic substance.

A detoxification treatment system for a PCB-containing transformer according to the tenth aspect of the present invention is a pretreatment means for recovering the PCB from the transformer containing PCB, and a separation for separating the pretreated transformer into an inorganic substance and an organic substance. Means and
Organic matter detoxification means for detoxifying the separated organic matter, aqueous solution treatment means for treating the surface of the separated inorganic matter with a surface treatment aqueous solution consisting of an acid solution or an alkaline solution, and the surface treatment aqueous solution used Sludge separation means for separating sludge from inside, sludge detoxification means for detoxifying the sludge, and aqueous solution / PCB for separating and recovering PCB from the used surface treatment aqueous solution
Since it is provided with a separating means, an inorganic substance detoxifying means for detoxifying the surface-treated inorganic matter, and a dechlorinating treatment means for dechlorinating the recovered PCB, the conventional PCB treatment is performed. In addition, since it is not necessary to melt the various metallic members to decompose the PCB, it is possible to suppress the increase in the scale of the equipment and also to suppress the necessary heat energy. The transformer can be detoxified relatively easily and at low cost.

A detoxification treatment system for a PCB-containing transformer according to the tenth aspect of the invention is as follows.
Since the pretreatment means includes an oil removing means for removing the PCB from the transformer and a rough cleaning means for roughly cleaning the transformer from which the PCB has been removed, the recovery rate of the PCB from the transformer can be increased. Therefore, the post-process can be facilitated.

A detoxification treatment system for a PCB-containing transformer according to a twelfth aspect of the invention is the system according to the tenth aspect or the tenth aspect of the invention, wherein the separating means removes the core from the transformer and the core. Since the cutting means for cutting and separating the iron core and the coil and the separating means for separating the cut coil into the copper wire and the organic substance are provided, it is possible to reliably separate the transformer into an organic substance and an inorganic substance. it can.

A detoxification treatment system for a PCB-containing transformer according to a thirteenth invention is the twelfth invention, wherein the separating means separates the copper wire of the coil from the organic matter by a difference in specific gravity in water. Since the wet separation means and the water / PCB separation means for separating and recovering PCB from the water used in the wet separation means are provided, it is possible to easily separate the copper wire and the organic matter, and The PCB that has been transferred to can also be reliably recovered, and dechlorination can be performed.

A detoxification treatment system for a PCB-containing transformer according to the 14th aspect of the invention is, in the 13th aspect of the invention, the extraction / transfer means for causing the water / PCB separation means to transfer the PCB in the water to an extraction liquid. PCB in the water
Since it is equipped with a membrane separation means for membrane separation,
CB can be easily recovered.

The detoxification treatment system for a PCB-containing transformer according to the fifteenth invention is the organic substance detoxification means according to any one of the tenth to fourteenth inventions, wherein the organic matter detoxification means heats the organic matter under vacuum. Since at least one of the heating means and the organic material cleaning means for cleaning the organic material with the cleaning liquid is provided, the PCB can be easily and reliably removed from the organic material.

A detoxification treatment system for a PCB-containing transformer according to a sixteenth aspect of the present invention is the sludge detoxification means according to any one of the tenth to fifteenth aspects of the invention.
Since at least one of a sludge vacuum heating means for heating the sludge in a vacuum and a sludge cleaning means for cleaning the sludge with a cleaning liquid is provided, PC from the sludge is provided.
B can be removed easily and reliably.

A detoxification treatment system for a PCB-containing transformer according to the seventeenth invention is the method according to any one of the tenth to sixteenth inventions, wherein the aqueous solution / PCB separating means is the PCB in the surface treatment aqueous solution. Since it is provided with an extraction and transfer means for transferring to the extraction liquid or a membrane separation means for performing membrane separation of PCB in the surface treatment aqueous solution, the PCB can be easily recovered from the surface treatment aqueous solution.

A detoxification treatment system for a PCB-containing transformer according to an eighteenth invention is the inorganic detoxification means according to any one of the tenth to seventeenth inventions, wherein the inorganic material is vacuum-heated. Since at least one of the vacuum heating means and the inorganic material cleaning means for cleaning the inorganic material with the cleaning liquid is provided, it is possible to easily and surely remove the PCB from the inorganic material.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a detoxification processing system for a PCB-containing transformer according to the present invention.

FIG. 2 is a schematic configuration diagram of a separation device.

FIG. 3 is a schematic configuration diagram of a surface treatment apparatus.

FIG. 4 is a schematic structural diagram of a transformer.

FIG. 5 is a schematic configuration diagram of a conventional detoxification processing system for a PCB-containing transformer.

[Explanation of symbols]

1 PCB 2 organic matter 3 inorganic substances 3a Copper wire 4 cleaning liquid 4a concentrate 5 extract 5a concentrate 6 alkaline solution 6a Alkaline stock solution 7 water 9 sludge 10 transformers 11 iron core 12 coils 13 cores 14 containers 17 Iron frame 18 Insulator 19 lid 111 Oil removing device 112 Rough cleaning device 113 Dismantling device 114 cutting device 115 Organic matter vacuum heating device 116 Inorganic substance cleaning device 120 separation device 121 Wet separation device 122 Extraction transfer device 130 Surface treatment device 131 Alkaline treatment equipment 132 Sludge separator 133 Sludge vacuum heating device 134 Extraction transfer device 140 Dechlorination equipment

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 61/14 500 B03B 5/28 Z 4H006 B03B 5/28 C07B 35/06 B09B 5/00 C07C 25/18 C07B 35/06 B09B 3/00 304Z C07C 25/18 5/00 Z (72) Inventor Toshikazu Shojima 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Co., Ltd. (72) Inventor Takashi Baba 1-1 Nagatagawa Nagasaki-shi Akinoura-cho F-Term in Nagasaki Shipyard & Machinery Works (Reference) 2E191 BA13 BC01 BD11 4D004 AA50 AB06 CA02 CA12 CA13 CA15 CA22 CA34 CA40 CA42 CA47 CB05 CB27 CB31 CC04 CC12 4D006 GA06 GA07 MB02 PA02 PB14 PB70 4D056 AB17 AC02 BA04 CA06 CA15 CA37 CA39 4D071 AA44 AB14 AB23 AB52 4H006 AA05 AC13 EA22

Claims (18)

[Claims] 1. From a transformer containing PCB to the PC
A pretreatment step of recovering B, a separation step of separating the pretreated transformer into an inorganic substance and an organic matter, an organic substance detoxification step of performing a detoxification treatment of the separated organic matter, and the separated inorganic substance An aqueous solution treatment step of treating the surface with a surface treatment aqueous solution consisting of an acid solution or an alkaline solution, a sludge separation step of separating sludge from the used surface treatment aqueous solution, and a sludge detoxification step of detoxifying the sludge And an aqueous solution / PCB separation step of separating and collecting PCB from the used surface treatment aqueous solution, an inorganic substance detoxification step of detoxifying the surface treated inorganic matter, and a dechlorination treatment of the collected PCB A method for detoxifying a PCB-containing transformer, which comprises performing a dechlorination step. 2. The PCB according to claim 1, wherein the pretreatment step includes an oil draining step of draining the PCB from the transformer and a rough cleaning step of rough cleaning the transformer from which the PCB has been drained. Method for detoxifying contained transformer. 3. The method according to claim 1, wherein the separating step includes a disassembling step of taking out a core from the transformer, a cutting step of cutting the core into a core and a coil, and the cutting step. A method for detoxifying a PCB-containing transformer, which comprises performing a separation step of separating a coil into a copper wire and an organic substance. 4. The wet separation process according to claim 3, wherein the separation process separates the copper wire of the coil from the organic matter by a difference in specific gravity in water, and PCB from the water used in the wet separation process. P characterized by performing a water / PCB separation step for separation and recovery
A method for detoxifying a CB-containing transformer. 5. The water / PCB separation step according to claim 4, wherein an extraction transfer step of transferring the PCB in the water to an extraction liquid or a membrane separation step of performing a membrane separation of the PCB in the water is performed. A method for detoxifying a PCB-containing transformer. 6. The organic substance detoxifying step according to claim 1, wherein the organic substance detoxifying step includes at least one of an organic substance vacuum heating step of vacuum heating the organic substance and an organic substance cleaning step of cleaning the organic substance with a cleaning liquid. A method for detoxifying a PCB-containing transformer, comprising: 7. The sludge detoxification step according to claim 1, wherein at least one of a sludge vacuum heating step of vacuum heating the sludge and a sludge cleaning step of cleaning the sludge with a cleaning liquid is performed. A method for detoxifying a PCB-containing transformer, comprising: 8. The aqueous solution / PCB separation step according to claim 1, wherein the aqueous solution / PCB separation step transfers the PCB in the surface treatment aqueous solution to an extraction solution or the PCB in the surface treatment aqueous solution. A method for detoxifying a PCB-containing transformer, which comprises performing a membrane separation step of performing membrane separation. 9. The inorganic substance detoxifying step according to claim 1, wherein at least one of an inorganic substance vacuum heating step of heating the inorganic substance in vacuum and an inorganic substance cleaning step of cleaning the inorganic substance with a cleaning liquid. A method for detoxifying a PCB-containing transformer, the method comprising: 10. A transformer containing PCB for converting the P
Pretreatment means for recovering CB, separation means for separating the pretreated transformer into inorganic matter and organic matter, organic matter detoxification means for detoxifying the separated organic matter, and separated inorganic matter An aqueous solution treatment means for treating the surface with a surface treatment aqueous solution consisting of an acid solution or an alkaline solution, a sludge separation means for separating sludge from the used surface treatment aqueous solution, and a sludge detoxification means for detoxifying the sludge An aqueous solution / PCB separation means for separating and recovering PCB from the used surface treatment aqueous solution, an inorganic matter detoxification means for detoxifying the surface treated inorganic matter, and a dechlorination treatment for the recovered PCB A detoxifying treatment system for a PCB-containing transformer, comprising: dechlorination treatment means. 11. The pretreatment means according to claim 10, wherein the pretreatment means includes an oil removing means for removing the PCB from the transformer, and a rough cleaning means for roughly cleaning the transformer from which the PCB has been removed. A detoxifying treatment system for PCB-containing transformers. 12. The disassembling means according to claim 10 or 11, wherein the disassembling means takes out a core from the transformer, a cutting means for cutting the core to separate an iron core and a coil, and A detoxification treatment system for a PCB-containing transformer, comprising: a separation means for separating the coil into a copper wire and an organic substance. 13. The wet separation means according to claim 12, wherein the separation means separates the copper wire of the coil from the organic matter by a difference in specific gravity in water, and PCB from the water used in the wet separation means. A detoxifying treatment system for a PCB-containing transformer, comprising: water / PCB separating means for separating and collecting. 14. The water / PCB separation means according to claim 13, wherein the water / PCB separation means includes an extraction / transfer means for transferring the PCB in the water to an extraction liquid or a membrane separation means for performing a membrane separation of the PCB in the water. The detoxification processing system of the PCB containing transformer. 15. The organic substance detoxifying unit according to claim 10, wherein the organic substance detoxifying unit includes at least one of an organic substance vacuum heating unit that vacuum-heats the organic substance and an organic substance cleaning unit that cleans the organic substance with a cleaning liquid. A detoxification system for a PCB-containing transformer, which is characterized in that 16. The sludge detoxification unit according to claim 10, further comprising at least one of a sludge vacuum heating unit that vacuum-heats the sludge and a sludge cleaning unit that cleans the sludge with a cleaning liquid. A detoxification system for a PCB-containing transformer, which is characterized in that 17. The method according to claim 10, wherein the aqueous solution / PCB separation means transfers the PCB in the surface treatment aqueous solution to an extraction liquid or the PCB in the surface treatment aqueous solution. PCB comprising membrane separating means for membrane separation
Detoxification processing system of contained transformer. 18. The inorganic substance detoxifying unit according to claim 10, wherein the inorganic substance detoxifying unit is at least one of an inorganic substance vacuum heating unit that vacuum-heats the inorganic substance and an inorganic substance cleaning unit that cleans the inorganic substance with a cleaning liquid. A detoxifying treatment system for a PCB-containing transformer, comprising: