JP2005261993A - Treating system and treating method for pcb-polluted substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective de-polluting method for a PCB-polluted substance. <P>SOLUTION: The treating system for de-polluting a washing object obtained by dismantling and/or crushing electric apparatuses containing PCB (polychlorobiphenyls) is provided with a washing tank, a solvent washing means, a steam washing means, a decompressing means, and a waste treating means. Washing or drying is performed in the washing tank where the washing or drying is performed in a prescribed temperature and pressure condition in the washing tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for decontamination of PCB contaminants. Specifically, the separated PCB contaminants are cleaned, and the residual cleaning agent (solvent) and PCB concentration (PCB amount) on the contaminants are efficiently reduced. On how to do.

  PCB has characteristics such as its excellent chemical stability, high heat resistance, and good electrical insulation, so it can be used as a transformer for electrical equipment, insulating oil for capacitors, ballasts for fluorescent lamps, or heat media. It has been used in large quantities. However, the harmful effects of PCBs on the human body became apparent, and by 1974, use in manufacturing, importing, and open systems was prohibited. In 1992, waste PCBs, waste oil containing PCBs and PCB contaminants were designated as specially managed industrial wastes based on the Waste Management Law, and a considerable amount of PCB-containing equipment and PCB-containing waste oil including transformers It is stored at offices.

  Furthermore, according to the “Special Measures Law for Promotion of Proper Treatment of Polychlorinated Biphenyl Waste” (enforced on July 15, 2001), waste oil including PCB and PCB is treated within 15 years (until July 2016). It became mandatory to do. About disposal of PCB, we entrust with specially controlled industrial waste disposal contractor pertaining to polychlorinated biphenyl which received permission based on law (waste disposal law) about the disposal itself and environmental corporation or waste disposal and cleaning It is said that polychlorinated biphenyls must be disposed of properly, and treatment facilities are being constructed at various places and disposal is beginning.

  PCB is a general term for polychlorinated biphenyl compounds, and there are theoretically 209 isomers depending on the number and position of chlorine in the molecule, and among them, the toxicity of PCB called coplanar PCB is extremely high. It is strongly regarded as one of the generic names for dioxins.

  Many processing methods have been devised for disassembling electrical equipment contaminated with PCB, removing (decontaminating) PCB, recycling electrical equipment, and performing final disposal (for example, Patent Document 1). reference). Among these, one of the problems is to efficiently wash what is easily impregnated with PCB oil typified by paper to lower the PCB content concentration, and various methods have been proposed.

  In Patent Document 1, an efficient cleaning process and the like are realized by disassembling and separating PCB contaminants for each degree of cleaning difficulty and performing an appropriate cleaning process or the like on each separated PCB contaminant. , A method for appropriately performing a PCB contaminant removal process is described. In particular, the second embodiment of Patent Document 1 discloses a method that enables a higher decontamination process by adding a vacuum heat drying process to the cleaning method described in the first embodiment. (Patent Document 1, paragraph [0067]).

However, in the processing method described in Patent Document 1, since the cleaning tank and the vacuum heating furnace are provided separately and independently (paragraph [0084] in Patent Document 1, etc.), each facility is required and the establishment cost is high. There was a problem. In addition, after immersion cleaning in a vacuum state (paragraph [0045] in Patent Document 1, etc.), the object is returned to atmospheric pressure, the object to be processed is transported to a vacuum heating furnace, evacuated again, and then about 200 to 300 ° C. In order to perform the process of cooling to about 100 to 200 ° C. by adding nitrogen and then cooling the air to about 60 ° C. or less by putting the air in the furnace, the pressure is reduced in the washing tank and the vacuum heating furnace. There is a problem in that it takes time to transport the objects and to raise and lower the temperature in the vacuum heating furnace, and the time required for the treatment is inevitably increased.
JP 2003-285041 A

  An object of this invention is to provide the efficient decontamination processing method of PCB contaminant.

  As a result of intensive investigations, the present inventors have performed a cleaning process and a drying process in a cleaning tank under a temperature / pressure condition that realizes a boiling point condition of PCB, so that the processing can be performed more than the conventional decontamination processing method. It has been found that PCB contamination can be efficiently decontaminated by shortening the time required for the process. The present invention has been made based on such findings.

That is, the present invention
(1) A processing system for decontaminating an object to be cleaned obtained by disassembling and / or crushing an electrical device containing PCB, including a cleaning tank, a solvent cleaning unit, a steam cleaning unit, a decompression unit, and a disposal A PCB contaminant treatment system comprising a treatment means, wherein the washing and drying means are performed under a constant temperature and pressure condition in the washing tank;
(2) The cleaning / drying means in the cleaning tank performs cleaning by reducing the pressure to 13322 Pa (100 Torr) to 1333 (10 Torr), and heats the object to be cleaned to 110 to 150 ° C. The PCB contaminant treatment system according to item (1), which is performed by adjusting the pressure to a pressure at which PCB evaporates and removing PCB and solvent.
(3) The PCB contaminant treatment system according to (1) or (2), wherein the electrical device is a transformer or a capacitor,
(4) The PCB contaminant treatment system according to any one of (1) to (3), wherein the solvent is a hydrocarbon system, and (5) the above (1) to (4) The present invention provides a method for treating PCB contaminants, characterized in that the treatment system according to any one of the above items is used.
In the present specification, PCB means PCB itself and insulating oil containing PCB. In this specification, a component that easily contains oil in paper, wood, rubber, and plastic is also referred to as an impregnating member, and is a metal (iron, copper, etc.) that is relatively difficult to contain (does not contain) oil. The element is also referred to as a non-impregnated member.

According to the processing method of the present invention, the apparatus can be simplified by performing the cleaning process and the drying process in the cleaning tank, and the time from the start of cleaning to the end of drying is specifically about 3 hours. PCB contamination can be efficiently decontaminated at a low cost. In addition, since the treatment method of the present invention can be carried out at a low temperature, the organic constituent elements such as paper can be easily disposed of.
The present invention improves the treatment of impregnating members that previously took a lot of time to reduce the PCB concentration (cleaning, drying, etc.), and can also be applied to non-impregnating members. It is.

Preferred embodiments of the system of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram of the configuration of the system of the present invention. As shown in FIG. 1, the system of the present invention includes a cleaning tank 1, a solvent cleaning means 2, a steam cleaning means 3, a decompression means 4, and a disposal processing means 5.
Connected to the cleaning tank 1 are a decompression means 4 for decompressing the inside of the tank, a solvent cleaning means 2 for entering and leaving the cleaning liquid into the tank, and a vapor cleaning means 3 for vaporizing the cleaning liquid of the solvent cleaning means 2 and feeding it into the tank. ing. Solvent cleaning means 2 is connected to the decompression means 4 in order to send the recovered and regenerated solvent, and a disposal processing means 5 for discarding the concentrated and reduced secondary PCB contaminants. Has been.

(Object to be cleaned)
Objects to be cleaned include transformers (transformers) and capacitors, for example, ceramics such as metal and insulators, iron cores, transformer / capacitor bodies (containers), coil copper wires / insulation paper, rubber / plastic resins, etc. Insulating wood and other organic materials (paper, processed paper products, etc.), bolts, screws and capacitor element aluminum foil, insulating paper, resin films, etc. (collectively referred to as dismantled materials). The present invention can also be applied to these disassembled products, those obtained by crushing the disassembled products, and those obtained by further separating and disassembling the disassembled products.

(Washing tank)
In the cleaning tank 1, cleaning is performed by putting an object to be cleaned into a basket (not shown) provided in the tank. The basket is not necessarily limited to the one fixed in the cleaning tank 1, and the basket itself may be movable and provided in the cleaning tank 1.
The cleaning tank 1 has a structure capable of maintaining a degree of vacuum, and a container (sink or the like) in which the cleaning basket can be immersed, a pipe capable of supplying and discharging a solvent, and a solvent and PCB vapor are supplied and discharged (suction). ) There is no particular limitation as long as it is provided with piping that can be used.

The shape of the cleaning basket is not particularly limited as long as it accommodates an object to be cleaned and does not interfere with cleaning. Examples of the shape of the cleaning basket include a cage shape (such as a square shape and a round shape).
Further, in the case of a cylindrical washing basket or the like among the washing baskets, the washing object is confined in the washing basket, and the washing basket (washing barrel) is rotated by using a rotating basket for washing while rotating in the washing tank. A drive mechanism (drive device) may be provided in the cleaning tank. Hereinafter, the cleaning rotating basket may be referred to as a cleaning basket or a basket.

(Solvent cleaning means)
The solvent cleaning means 2 has a cleaning liquid (solvent) supplied to the cleaning tank 1. As the cleaning liquid (solvent), a cleaning liquid suitable for the degree of contamination of the object to be cleaned, the type of PCB to be removed, and the like can be selected from a hydrocarbon-based cleaning liquid (for example, normal paraffin type).
The solvent cleaning means 2 is preferably provided with an apparatus (for example, a distillation apparatus) for regenerating the solvent containing PCB recovered from the cooler of the cleaning tank 1 or the decompression means 4. By providing the solvent regeneration device, the amount of new solvent used (the amount of solvent to be replenished) can be reduced. Moreover, it is preferable to install the solvent cleaning means 2 at a position lower than the cleaning tank 1. With such an arrangement, the solvent can be caused to flow down to the solvent cleaning means 2 by gravity when the liquid in the cleaning tank 1 is drained, and equipment such as a pump can be omitted.

(Vapor cleaning means)
The system of the present invention also has means for allowing the evaporated cleaning liquid to flow into the cleaning tank 1 in addition to the means for allowing the cleaning liquid to flow directly from the solvent cleaning means 2 into the cleaning tank 1. A steam cleaning means 3 (steam generator (heat exchanger), etc.) for supplying the amount of heat necessary for evaporating and evaporating the cleaning liquid is installed in the middle of the pipe from the solvent cleaning means 2 to the cleaning tank 1. Yes. As a heat source supplied to the steam generator, a heat medium such as water vapor or heating oil can be appropriately used. The electric heater is preferably not used because it may cause ignition when the cleaning liquid leaks.

(Pressure reduction means)
The decompression means 4 (such as a vacuum pump) is used to decompress the inside of the cleaning tank 1. As the vacuum pump, it is possible to appropriately select a pump that satisfies the conditions to be used (the resistance of the pump to the cleaning liquid, the required degree of vacuum, etc.). It is more preferable to use a plurality of vacuum pumps so as to reach the required degree of vacuum more efficiently. By using a plurality of pumps, the types of pumps that can be selected are increased, and the pump can be operated without applying an excessive load, so that the operating rate of the apparatus can be increased.
It is preferable that a cooler for cooling the gaseous cleaning solvent (cleaning liquid) is installed before and after the decompression means 4. By providing the cooler, the solvent or PCB can be liquefied and sent to the solvent cleaning means to recycle the solvent. In addition, the amount of gaseous PCB sent to the disposal processing means can be reduced, and the load (processing amount) of the gas processing part that tends to increase the processing amount can be reduced.

(Disposal method)
The discard processing means 5 discards the concentrated / reduced secondary PCB contaminant.
Since the pipe connected from the cleaning tank to the vacuum pump contains cleaning liquid (cleaning steam) containing PCB, the steam (gaseous PCB or solvent) is liquefied and recovered with a cooler before exhausting to the atmosphere. Send to cleaning means to reuse the solvent. Further, the exhaust gas is discharged into the atmosphere through an activated carbon filter or the like, so that PCB does not diffuse into the environment. In the disposal processing means 5, disposal processing is performed on waste liquid other than the regenerated solvent and secondary PCB contaminants such as the activated carbon filter.

  In the system of the present invention, it is preferable to automate the loading / unloading of the cleaning basket into / from the cleaning tank, the opening / closing of the door of the cleaning tank, etc., because the risk of exposure of the worker to the PCB can be reduced. Further, in the system of the present invention, components such as transfer means such as pumps and ejectors, valves, and flow meters can be used as appropriate.

Next, a processing method using the system of the present invention will be described. A preferred embodiment of the present invention is shown in FIG. Hereinafter, the work process will be described with reference to FIGS.
<Work process>
The objects to be cleaned 6 are put into different baskets for each object to be cleaned, and are processed under cleaning and drying conditions suitable for the object to be cleaned.

Bring basket to vacuum (steps 21, 22, and 23)
First, the cleaning object 6 put in the basket from the previous process is carried and set in the cleaning tank 1. The door of the cleaning tank 1 is closed, and evacuation is started by the vacuum pump 4, and the pressure is set to about 1333 Pa (10 Torr) to 13332 Pa (100 Torr), preferably about 5333 Pa (40 Torr) to 8000 Pa (60 Torr).

Pumped liquid-1 (process 24)
After completion of evacuation, the solvent (cleaning liquid A) is sent from the solvent cleaning means 2 to the cleaning tank 1, and the cleaning basket and the object to be cleaned are immersed.

Immersion cleaning-1 (Step 25)
After the cleaning tank 1 is filled with the cleaning liquid A, the liquid temperature is set to 40 ° C. to 60 ° C., preferably about 50 ° C., the cleaning tank pressure is set to about 6666 Pa (50 Torr), and held for a predetermined time. From the viewpoint of decontamination efficiency, it is preferable to irradiate the cleaning object 6 in the basket with ultrasonic waves during this immersion to enhance the cleaning effect. Immersion cleaning time (holding time in the cleaning tank) is an optimal time (about 10 to 60 minutes) considering what the object to be cleaned 6 is (paper, metal, etc.) and how much PCB is contained. Can be selected. For how long the cleaning tank 1 holds, a test corresponding to the object to be cleaned is separately conducted, and the optimum time is determined in advance from the temperature of the object to be cleaned 6 and the PCB removal rate.

Falling down-1 (step 26)
The cleaning liquid A is extracted from the cleaning tank 1. At this time, it is possible to design appropriately such as using a transfer means such as a pump or a gravity flow type.

Steam cleaning-1 (step 27)
Next, while maintaining the pressure reached by evacuation, the cleaning liquid A is sent from the solvent cleaning means 2 to the steam generator 3, and the cleaning liquid is cleaned by the steam generator 3 so that the temperature of the object 6 to be cleaned becomes about 130 ° C. Heat is applied to A, and the solvent (cleaning liquid) is vaporized (for example, at a cleaning agent vapor temperature of 160 ° C.) and sent to the cleaning tank 1. A cleaning liquid vapor is supplied to the cleaning tank 1 for a predetermined time (for example, 10 minutes). Even if the pressure is changed by supplying steam, the pressure need not be controlled. For the steam cleaning time (steam supply time), the optimum time (about 10 to 60 minutes) is adopted in consideration of what the object to be cleaned (paper, metal, etc.) and how much PCB is contained. can do. For how long the cleaning tank 1 holds, a test corresponding to the object to be cleaned is separately conducted, and the optimum time is determined in advance from the temperature of the object to be cleaned 6 and the PCB removal rate.
Pumped liquid-2 (process 28)
After completion of the steam cleaning-1 (step 27), a cleaner solvent (cleaning liquid B) is sent from the solvent cleaning means to the cleaning tank, and the cleaning basket and the object to be cleaned are immersed.

Immersion cleaning-2 (Step 29)
After the cleaning liquid B is filled, immersion cleaning is performed under the same conditions as immersion cleaning-1 (step 25).

Falling liquid-2 (process 30)
The cleaning liquid B is extracted from the cleaning tank in the same manner as the falling liquid-1 (step 26).

Steam cleaning-2 (process 31)
When the liquid drop is completed, steam cleaning is performed under the same conditions as in steam cleaning-1 (step 27). (Steps from pumping liquid-2 (step 28) may be repeated, and immersion cleaning-2 (step 29) and steam cleaning-2 (step 31) may be repeated a plurality of times.

Vacuum drying (process 32)
The cleaning liquid and the PCB are removed reliably (efficiently) by further lowering the pressure of the cleaning tank with respect to the object to be cleaned that has reached a temperature of about 130 ° C. by the steam cleaning.
The pressure of the cleaning tank after the steam cleaning is first reduced to about 400 Pa (3 Torr) to 1333 Pa (10 Torr), preferably about 533 Pa (4 Torr) to 800 Pa (6 Torr) by a vacuum pump. At this time, the solvent (cleaning liquid) is mainly removed from the object to be cleaned. Next, the pressure of the washing tank is further lowered to 50 Pa (0.38 Torr) or less, preferably 5 Pa (0.038 Torr) to 10 Pa (0.075 Torr) with a vacuum pump. The lower this pressure, the better. At this time, PCB is mainly removed from the object to be cleaned.
As long as the vacuum pump for achieving the pressure at the time of vacuum drying can achieve this pressure, a plurality of units may be used by switching them, or a plurality of units may be used continuously, or a single unit may be realized. . At this time, it is not necessary to control the temperature of the washing tank.

If necessary, this vacuum drying step may be repeated a plurality of times to further remove the PCB and the solvent.
Under the conditions of the present invention (immersion cleaning, steam cleaning, vacuum drying), organic substances such as paper do not carbonize, and PCB decontamination can be performed without replacing the inside of the tank with nitrogen, The treated material can be recycled or sent to the next process.

  In this step, since the PCB and the cleaning liquid (solvent) are sucked into the decompression means by the pump, they are cooled and condensed (liquefied) by the cooler provided in the decompression means and sent to the solvent cleaning means. Then, the solvent and PCB are separated, and the PCB is detoxified in a treatment (detoxification) facility, and the solvent is reused if certain conditions are satisfied.

Release to atmosphere-unload basket (process 33, 34, 35)
After completion of the vacuum drying, air is gradually introduced from an air introduction pipe (not shown) to restore the pressure inside the cleaning tank 1 to atmospheric pressure.
After the washing tank pressure is restored to atmospheric pressure, the washing tank door is opened and the washing basket is unloaded. The unloaded basket is sent to the next process. At this time, it may be transferred from the washing basket to a container for transporting as necessary.

Each of the above steps can be automated using any automation technology such as various sensors (temperature sensor, pressure sensor, etc.) and contact (proximity) switch.
Also, the cleaning basket can be transported by any method such as an automatic transport device such as various conveyors (roller conveyor, belt conveyor, etc.), AGV (Automated Guided Vehicle), or a crane.

  EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.

Confirmation (graduation judgment) whether or not the standard value is satisfied was carried out by the official method. That is, for metals (iron, copper, etc.) and insulators, member sampling test method (reference value 0.01 mg / kg or less: PCB / member), wiping test method (reference value 0.1 μg / 100 cm ² or less: PCB / Member) and cleaning liquid test method (reference value 0.5 mg / kg or less: PCB / cleaning liquid).
For papers (paper, wood chips, fiber scraps, etc.), the standard value was 0.003 mg / liter or less: PCB / test solution. In addition, since the concrete verification method about paper is not yet established, it carried out according to the test procedure of the dissolution test in the Environment Agency Notification No. 13 here.

Example 1
Using the system having the configuration shown in FIG. 1, cleaning and vacuum drying were performed according to the steps shown in FIG. As the object to be cleaned, crushed paper (insulating paper) that passed through a 3 mm screen in the crushing step was used.
The cleaning barrel and cleaning tank were as follows.
Cleaning barrel: Liquid capacity of rotating basket cleaning tank with diameter (Φ) 400 x length 400 mm: about 150 liters

  First, 4 kg of the above paper is put into a cleaning barrel (rotary basket), and the pressure is reduced to 6000 Pa. Then, the solvent is sent from the solvent cleaning means 2 to the cleaning tank 1 to fill the cleaning tank 1, and the cleaning barrel and the object to be cleaned are immersed. Then, while irradiating the paper (object to be cleaned) in the cleaning barrel with ultrasonic waves, it was held for 10 minutes under conditions of a cleaning tank pressure of 6666 Pa (50 Torr) and a cleaning liquid temperature of about 50 ° C. (immersion cleaning-1).

  Next, the cleaning liquid is extracted from the cleaning tank 1 and the cleaning liquid is sent from the solvent cleaning means 2 to the steam generator 3 while maintaining the pressure reached by evacuation, and about 160 ° C. cleaning liquid vapor is supplied to the cleaning tank 1 for 10 minutes. (Vapor cleaning-1). After completion of the steam cleaning, a cleaner solvent (cleaning liquid) was sent from the solvent cleaning means to the cleaning tank, the cleaning barrel and the object to be cleaned were immersed, and immersion cleaning was performed again (immersion cleaning-2). This immersion cleaning was performed under the same conditions as the previous immersion cleaning (immersion cleaning-1).

  Next, the cleaning liquid was extracted from the cleaning tank 1 and again subjected to steam cleaning. While maintaining the pressure reached by evacuation, the cleaning liquid was sent from the solvent cleaning means 2 to the steam generator 3 and about 160 ° C. cleaning liquid vapor was supplied to the cleaning tank 30 for 30 minutes (vapor cleaning-2).

  The pressure of the cleaning tank after the steam cleaning was lowered to 667 Pa (5 Torr) by a vacuum pump and held for 10 minutes, and then lowered to 5 Pa (0.038 Torr) and kept for 30 minutes (vacuum drying).

The type of cleaning liquid (solvent) used in each cleaning process was a normal paraffin hydrocarbon cleaning liquid. In the pumping process, a pump was used, and in the liquid dropping process, the solvent cleaning means was installed below the cleaning tank, so the liquid was dropped under gravity flow.
In vacuum drying, two vacuum pumps were used, and the pressure was reduced to about 667 Pa (5 Torr) with the first vacuum pump, and the pressure was reduced to about 5 Pa (0.038 Torr) with the second pump.

As a result, it was found that the PCB elution concentration from the cleaned member was 0.0009 mg / liter (according to the elution test method), sufficiently satisfying the standard value of 0.003 mg / liter. The time from the start of washing to the end of drying was 2 hours.
Moreover, when the test which repeated immersion cleaning-2 and steam cleaning-2 was also performed 3 times, as a result, the PCB elution density | concentration from the member after washing | cleaning was reduced to 0.0004 mg / liter (by the elution test method) and halved. I understood.

Example 2
A metal that passed through a 7 mm screen in the crushing process was used as an object to be cleaned. This metal is a crushed copper material obtained by washing and dismantling the coil portion of the transformer and separating the insulating paper. Cleaning and vacuum drying were performed in the same manner as in Example 1 except that 20 kg of the crushed copper was put in a cleaning basket. A washing basket having a size of 500 (vertical) × 400 (horizontal) × 250 (depth) mm was used.
As a result, it was found that the PCB content of the cleaned member was 0.003 mg / kg (according to the member sampling test method), sufficiently satisfying the standard value of 0.01 mg / kg. Further, the time from the start of washing to the end of drying was 2 hours. Since the PCB concentration of the crushed copper after washing was such a concentration that there was no problem in subsequent processing, it was found that final disposal (recycling) can be performed in the next step.

Example 3
A capacitor element made of insulating paper and aluminum foil was crushed in a crushing process and passed through a 3 mm screen as a cleaning object. Cleaning and vacuum drying were performed in the same manner as in Example 1 except that 5 kg of the crushing element was put in a cleaning barrel (rotary basket).
As a result, it was found that the PCB content of the cleaned member was 0.0005 mg / liter (according to the dissolution test method), which sufficiently satisfied the standard value of 0.003 mg / liter. The time from the start of washing to the end of drying was 2 hours.

FIG. 1 is a conceptual diagram showing a preferred embodiment of the system of the present invention. FIG. 2 is a flow diagram illustrating a preferred embodiment of the processing method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cleaning tank 2 Solvent cleaning means 3 Vapor cleaning means 4 Depressurization means 5 Waste disposal means 6 Cleaning object

Claims (5)

  A processing system for decontaminating an object to be cleaned obtained by disassembling and / or crushing electrical equipment containing PCB, comprising a cleaning tank, a solvent cleaning means, a steam cleaning means, a decompression means, and a disposal processing means And a PCB contaminant treatment system, wherein the washing / drying means is performed under a constant temperature and pressure condition in the washing tank.   The cleaning / drying means in the cleaning tank performs cleaning by reducing the pressure to 13322 Pa (100 Torr) to 1333 (10 Torr), and heats the object to be cleaned to 110 to 150 ° C., and then the PCB evaporates at that temperature. 2. The PCB contaminant treatment system according to claim 1, wherein the PCB contaminant is removed by adjusting the pressure to the pressure to be removed.   3. The PCB contaminant treatment system according to claim 1, wherein the electrical device is a transformer or a capacitor.   The system for treating a PCB contaminant according to any one of claims 1 to 3, wherein the solvent is hydrocarbon-based.   A method for treating PCB contaminants, wherein the treatment system according to any one of claims 1 to 4 is used.

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