JP2003261465A - Facility for treating organic halogenated material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide facilities for treating organic halogenated materials, each having a treating unit for treating hazardous materials so as to completely treat equipment polluted with the organic halogenated materials, and capable of making gas discharged from the treating unit absolutely nothing so as to take countermeasures to the environment. <P>SOLUTION: The facilities for treating the organic halogenated materials decompose and treat the organic halogenated materials or the hazardous materials containing the organic halogenated materials, wherein the facilities are each equipped with the treating unit 120 for conducting hydrothermal oxidative decomposition of the hazardous materials (containing polychlorinated biphenyls) to discharge a treated liquid 12 containing carbon dioxide, a gas-liquid separation means 15 for separating the treated liquid 12 into a gas component 13 and a liquid component 14, and an alkali absorption tank 16 for absorbing the carbon dioxide in the gas component separated from the gas-liquid separation means 15. <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 hazardous substance treatment facility capable of completely treating organic halide contaminated equipment such as PCBs such as transformers.

[0002]

BACKGROUND ART In recent years, PCB (Polychlorinated biph)
Since enyl, polychlorinated biphenyl: a generic term for chlorinated isomers of biphenyl) is highly toxic, its production 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 as a result of the Kanemi Yusho incident.
In the past year, there was a history of instructions to discontinue production and collection (duty of storage) due to 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 widely remains in the environment such as water and living things. As a result, since PCB is extremely stable in the body, it accumulates in the body and causes chronic poisoning (skin disorders, liver disorders, etc.), carcinogenicity, reproduction and reproduction.
Developmental toxicity is noted.

Since PCB has been widely used as an insulating oil for transformers and capacitors, it is necessary to treat the PCB.
A hydrothermal oxidative decomposition apparatus for detoxifying CB has been proposed (JP-A-11-253796 and JP-A-2000-126).
588, etc.).

This hydrothermal oxidative decomposition is carried out in the subcritical region (for example, 2
Sodium carbonate (Na) in hot water at 6 MPa and 380 ° C.
₂ CO ₃ ) crystals are precipitated and the high surface activity of these crystals reacts with chlorine (Cl) in PCB to generate NaCl (dechlorination reaction), and the PCB and oil after dechlorination are oxidized. Carbon dioxide (CO ₂ ) and a step of decomposing it into water (oxidative decomposition reaction). In this hydrothermal oxidative decomposition, by using sodium carbonate, Cl separated from PCB is not corrosive HCl but harmless NaCl, so that it can be discharged into the environment.

[0006] The PCB is completely rendered harmless by extracting it from a PCB-containing container (for example, a transformer or a capacitor) and treating it by using such a processing apparatus. Further, although the gas discharged from the inside of the treatment facility is monitored by the exhaust gas monitoring means, it is desired to take environmental measures to reduce the discharge of this exhaust gas to zero.

In view of the above-mentioned problems, the present invention aims at environmental measures by eliminating gas emitted from a harmful substance treatment facility capable of completely treating an organic halide contaminated equipment such as a PCB such as a transformer. An object is to provide an organic halide treatment equipment and an organic halide treatment equipment system.

[0008]

The first invention for solving the above-mentioned problems is an organic halide treatment facility for decomposing an organic halide or a harmful substance containing the organic halide. Gas-liquid separation means for gas-liquid separation of a treatment liquid containing carbon dioxide discharged from a treatment facility for hydrothermal oxidative decomposition of a substance, and alkali absorption for absorbing carbon dioxide (CO ₂ ) separated from the gas-liquid separation means An organic halide treatment facility characterized by comprising a tank.

In a second aspect of the present invention, in the first aspect, the treatment facility for decomposing the harmful substance has a dehalogenation reaction of an organic halide in the presence of a carbonate in a heated / pressurized reaction tower. An organic halide treatment facility is a hydrothermal oxidative decomposition apparatus that decomposes chloride, carbon dioxide (CO ₂ ) and the like by an oxidative decomposition reaction.

In a third aspect based on the second aspect, the hydrothermal oxidative decomposition apparatus comprises a cylindrical reaction tower, oil or an organic solvent, an organic halide, water (H ₂ O) and sodium hydroxide ( A pressure pump for pressurizing each treatment solution of (NaOH) into the reaction tower, a preheater for preheating the water, a high-pressure oxygen supply means, and a cooler for cooling the treatment solution from the reaction tower,
An organic halide treatment facility is characterized by comprising a gas-liquid separating means for separating the treatment liquid into a liquid and a pressure reducing valve.

A fourth invention is characterized in that, in the third invention, the above-mentioned reaction tower comprises a plurality of reaction towers or a second reaction tower having a structure in which a pipe is spirally wound after the first reaction tower. It is in an organic halide treatment facility.

A fifth aspect of the present invention is any one of the first to fourth aspects, further comprising a supply line for supplying oxygen separated from the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. It is a characteristic organic halide treatment facility.

According to a sixth aspect of the present invention, in any one of the second to fifth aspects of the present invention, a supply line is provided for supplying the carbonate produced in the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. It is a characteristic organic halide treatment facility.

In a seventh aspect of the present invention, a pretreatment means having one or both of a withdrawing means for withdrawing a harmful substance from the object to be treated and a disassembling means for disassembling the object to be treated, and the treatment with the pretreatment means. Paper from the components that make up the
Separation means for separating organic substances such as wood / resin and inorganic substances such as metals, and hydrothermal oxidative decomposition treatment device for hydrothermal oxidative decomposition treatment of harmful substances separated by pretreatment means in the presence of carbonate in the subcritical region A gas-liquid separating means for separating a treatment liquid containing carbon dioxide (CO ₂ ) discharged from the hydrothermal oxidative decomposition treatment device into a liquid and a carbon dioxide (CO ₂ ) separated from the gas-liquid separating means. An organic halide treatment system characterized by comprising an alkali absorption tank for absorption.

An eighth aspect of the present invention is a pretreatment unit having one or both of a withdrawal unit for extracting a harmful substance from the object to be treated and a disassembly unit for disassembling the object to be treated, and a pretreatment unit. Paper from the components that make up the
Separation means for separating organic substances such as wood / resin and inorganic substances such as metal, and the harmful substances adhering to the object from which the harmful substances are extracted or the harmful substances impregnated into the disassembled constituent materials A vacuum heating means for evaporating by vacuum heating, a hydrothermal oxidative decomposition apparatus for hydrothermally oxidizing and decomposing harmful substances separated by the pretreatment means in the presence of a carbonate in a subcritical region, and the hydrothermal oxidative decomposition processing A supply line for supplying carbon dioxide (CO ₂ ) discharged from the apparatus to the vacuum heating means, and carbon dioxide (CO ₂ discharged from the vacuum heating means).
_The organic halide treatment system is characterized by comprising an alkali absorption tank for absorbing ₂ ).

A ninth aspect of the invention is characterized in that, in the seventh or eighth aspect of the invention, it comprises a supply line for supplying oxygen separated from the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. In the halide processing system.

A tenth aspect of the present invention is characterized in that, in the seventh or eighth aspect of the invention, the apparatus is provided with a supply line for supplying the carbonate produced in the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. In the halide processing system.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the organic halide treatment facility according to the present invention will be described below, but the present invention is not limited to these embodiments.

FIG. 1 shows an organic halide treatment facility according to this embodiment. As shown in FIG. 1, the organic halide treatment equipment according to the present embodiment is an organic halide treatment equipment for decomposing an organic halide or a harmful substance containing the organic halide, Treatment facility 12 for hydrothermal oxidative decomposition of (PCB)
Treatment liquid 12 containing carbon dioxide (CO ₂ ) discharged from 0
It is provided with a gas-liquid separation means 15 for separating the liquid into a gas component 13 and a liquid component 14, and an alkali absorption tank 16 for absorbing the carbon dioxide separated from the gas-liquid separation means 15.

The alkali absorption tank 16 may be, for example, a scrubber type as shown in FIG. 1, but the present invention is not limited to this. As shown in FIG. 1, the scrubber type alkali absorption tank 16 comprises a circulation line 22 for circulating the alkali absorption liquid 21 and a spraying means 23 for spraying the circulating alkali absorption liquid 21 from the upper part of the tank. The carbon dioxide (CO ₂ ) in the gas separated from the separating means 13 is absorbed by the alkali absorbing liquid 21.

The trace amount of oxygen (O ₂ ) contained in the gas may be separated as pure oxygen and supplied separately to the oxygen supply facility via the supply line 24.

The alkali absorbing liquid 21 is not particularly limited as long as it is an alkaline solution. For example, sodium hydroxide, potassium hydroxide or the like can absorb sodium carbonate, potassium carbonate or the like by absorbing carbon dioxide. Since the alkali salt 25 is produced, the alkali salt 25 may be supplied to the hydrothermal oxidative decomposition treatment facility.

[Second Embodiment] FIG. 2 shows a facility 12 for hydrothermal oxidative decomposition treatment of PCB equipped with the facility for treating exhaust gas.
It is a block diagram of 0.

As shown in FIG. 1, a cylindrical primary reactor 1
22 and oil 123a for combustion, drained PCB123
b, sodium hydroxide (NaOH) 123c and water 12
Each of 3d is pressurized and charged into the primary reactor 122.
Pressure pumps 124a-124d, water and sodium hydroxide
A preheater 125 for preheating a mixed solution with the aluminum, and the above primary reaction
High-pressure oxygen supply equipment 13 for supplying high-pressure oxygen into the vessel 122
8 and a secondary reactor 126 having a structure in which piping is wound, for example.
The cooler 127 and the pressure reducing valve 128 are provided. Also,
A steam separator 129 and an activated carbon tank are provided downstream of the pressure reducing valve 127.
130 is installed, and exhaust gas (CO₂) 131 is smoke
It is discharged from the protrusion 132 to the outside and discharged (H ₂O, NaC
l) 133 is separately treated as waste water as required. Well
In addition, the oxygen pipe 139 is directly connected to the primary reactor 125.
I'm tied. The reactor may be, for example, a primary
A plurality of reactors may be arranged in parallel, or the secondary reactor 126 may be
It can be omitted if necessary.

In the above apparatus, the pressure pumps 124a ...
The pressure in the primary reactor 122 is 26
The pressure is increased to MPa. Further, the preheater 125 uses water and N
The mixed treatment solution of aOH is preheated to about 300 ° C. Also,
Oxygen is ejected into the primary reactor 122,
Heat up to 380 ℃ -400 ℃ subcritical range
It Sodium carbonate precipitated in this subcritical hot water
(Na₂CO₃) Crystal reacts with PCB, dechlorination reaction
Reaction and oxidative decomposition reaction, resulting in NaCl, CO ₂And
And H₂It is decomposed into O. Next, in the cooler 127
Cools the fluid from the secondary reactor 126 to about 100 ° C.
At the same time, the pressure is reduced to atmospheric pressure by the pressure reducing valve 128 in the subsequent stage.
It Then, by the steam separator 129, CO₂And water vapor
Gas component 13 consisting of air and liquid component 14 serving as drainage
Separated, CO₂Is absorbed and removed with the alkaline absorbent 16.
Be done. In addition, sodium chloride is mixed in the drainage 14.
However, after desalting separately, use a hydrothermal oxidative decomposition device.
It can be reused as the used water 123d.

Here, the primary reaction vessel 122 which is a reaction tower
The hydrothermal decomposition reaction of PCB in the secondary reactor 122 will be described.

First, at the start of the reaction, oil, organic solvent, etc. are acidified.
The oxidant supplied from the agent supply source into the tower (in the present embodiment,
Uses oxygen) to produce carbon dioxide
It For example, use oil (such as toluene) as a combustion material.
For example, if you use ₆H_FiveCH₃+ 9O₂→ 4
H₂O + 7CO₂Due to the reaction of₂Is generated. this
The oxidation reaction is an exothermic reaction, which increases the temperature inside the system.
Rises and the pressure rises accordingly. In this embodiment,
The temperature and pressure inside the primary reaction vessel 122 are 380 and 380, respectively.
When maintained in the subcritical region of ℃ and 26MPa, the maximum P
It has been found that the decomposition rate of CB is improved.

The CO ₂ produced as described above reacts with sodium hydroxide supplied together with PCB in the primary reaction vessel 122 to produce sodium carbonate (Na ₂ CO ₃ ). 2NaOH + CO ₂ → Na ₂ CO ₃ + H ₂ O (A) Next, Na ₂ CO produced by the reaction of the above (A)
₃ reacts with PCB, desalting and oxidatively decomposing PCB. C ₁₂ H ₆ Cl ₄ + 12.5O ₂ + 2Na ₂ CO ₃ → 4NaCl + 3H ₂ O + 14CO ₂ (B) In the case of the above-mentioned PCB having a chlorine number of 4, the same reaction is obtained for other chlorine numbers. Occurs, PCB is H ₂
It is decomposed into O, CO ₂ , and NaCl. The CO ₂ generated by the above reaction (B) is further converted into N ₂ by the above reaction (A).
Na ₂ CO that reacts with aOH and is required for the reaction of (B)
_Will generate ₃ . By the way, the above (B) PC
In the B decomposition reaction, sodium carbonate (Na ₂ C
O ₃ ) acts not only as a reaction agent but also as a catalyst for promoting the decomposition reaction of (B). Further, it has been found that the decomposition reaction of the above (B) is promoted in an alkaline atmosphere (for example, pH 10 or higher).

According to the hot water decomposing device 120, it is possible to decompose to 0.5 ppb or less, which is less than the current PCB discharge standard value (3 ppb), and complete decomposition is possible. This allows PCB
It becomes possible to completely treat the contained article and completely eliminate the PCB.

The gas component 13 separated by the gas-liquid separator 129 is stored in the alkali absorption tank 16 as C
The exhaust gas becomes zero by completely removing O ₂ .

Thus, the hydrothermal oxidative decomposition system 1 described above
By using 20, it becomes possible to surely decompose the PCB in hot water. In addition, organic compounds other than PCB can also be decomposed, and dioxins contained in PCB, organic substances such as paper, wood, cloth, etc. contaminated by PCB, and cleaning agents used for cleaning the case can also be decomposed. It will be possible.

[Third Embodiment] Next, an organic halide treatment facility monitoring system using the apparatus of the present invention will be described. As shown in FIG. 3, the system according to the present embodiment is a harmful substance treatment system for detoxifying an object to be treated to which an organic halide (for example, PCB), which is a harmful substance, is attached, contained, or stored. , Object to be processed 10
Container for storing hazardous substance (eg PCB) 1002 which is 01
Liquid withdrawing means 1004 for withdrawing harmful substances 1002 from 1003,
Pretreatment means 1006 having one or both of disassembling means 1005 for disassembling the constituent materials 1001a, b, ... Which compose the object to be processed 1001, and constituent materials which compose the object to be processed by the preprocessing means 1006. The core separating means 1007 for separating the core 1001a into the coil 1001b and the iron core 1001c, the coil separating means 1008 for separating the separated coil 1001b into the copper wire 1001d and the paper / wood 1001e, and the core separating means 1008. Cleaning means 1011 for cleaning the separated iron core 1001c, the metal container (container body and lid, etc.) 1003 separated by the disassembling means 1005, and the copper wire 1001d separated by the coil separating means 1008 with the cleaning liquid 1010, and the cleaning Hazardous substance decomposition treatment means 1013 for decomposing either one or both of the subsequent cleaning waste liquid 1012 and the harmful substance 1002 separated by the pretreatment means, and a gas for liquid-liquid separation of the treatment liquid from the harmful substance decomposition treatment means 1013. Liquid separator 12
9 and an alkali absorption tank 16 that absorbs and removes CO ₂ in the gas component 13 that has been gas-liquid separated.

[0033] Thus, CO ₂ in the gas components 13 from the gas-liquid separator 129 in the alkaline absorption tank 16, the CO ₂ to completely remove, the exhaust gas becomes zero.

When the harmful substance is a liquid or the like,
The harmful substance is decomposed by directly putting it into the harmful substance decomposition treatment means 1013, and the stored container can be treated by the detoxification treatment of the constituent materials.

Examples of the object to be treated in the present invention include, but are not limited to, transformers and capacitors using PCB as insulating oil, and storage containers for storing paints which are harmful substances. Not something.

In the ballast for fluorescent lamps, PCB has been used in the past, so it is necessary to detoxify it. In this case, since the capacity is small, it is not necessary to perform pretreatment, and directly to the separating means 1009. It can be detoxified by throwing it in.

[Fourth Embodiment] Next, an organic halide treatment system using the apparatus of the present invention will be described. As shown in FIG. 4, the system according to the present embodiment is provided with an organic halide (for example, PCB) which is a harmful substance.
Is a harmful substance treatment system for detoxifying an object to be treated which is attached to, contained or stored in, and is a means for extracting the harmful substance 1002 from a container 1003 for storing a harmful substance (PCB) 1002 which is the object to be treated 1001. 1004 and processed object 10
Disassembling means for disassembling the constituent materials 1001a, b, ...
Pretreatment means 1006 having either or both of 1005
And a core 1001a, which is a constituent material of the object to be processed by the pretreatment means 1006, a coil 1001b and an iron core 1001.
core separating means 1007 for separating into c and separated coil
Coil separating means 1008 for separating 1001b into a copper wire 1001d and paper / wood 1001e, a metal container separated by an iron core 1001c separated by the core separating means 1008 and a disassembling means 1005 (a container body and a lid, etc.) Cleaning means 1011 for cleaning 1003 and the copper wire 1001d separated by the coil separation means 1008 with the cleaning liquid 1010.
In the case of a high concentration PCB in the pretreatment means 1006 and a harmful substance decomposition treatment means 1013 for decomposing either or both of the cleaning waste liquid 1012 after washing and the harmful substance 1002 separated by the pretreatment means, PCB attached to a container
A vacuum heating equipment 1020 for vaporizing the gas from the container, a gas-liquid separator 129 for gas-liquid separating the processing liquid from the harmful substance decomposition processing means 1013, and CO ₂ in the gas-liquid separated gas component 13 as described above. Supply line 10 for supplying to the vacuum heating device 1020
21 and exhaust gas 1022 from the vacuum heating device 1020
It is provided with an alkali absorption tank 16 which is supplied via 1023 and is absorbed and removed by an alkali absorption liquid.

Therefore, as the gas used in the vacuum heating device 1020, C generated in the organic halide decomposition treatment is used.
O ₂ can be used and the vacuum heating device 1020
The exhaust gas 1022 from the
Complete removal of CO ₂ results in zero exhaust gas from the overall treatment system.

[0039]

As described above, according to the present invention, there is provided an organic halide treatment facility for decomposing an organic halide or a harmful substance containing the organic halide, wherein the harmful substance is treated with water. It is provided with a gas-liquid separation means for separating a processing solution containing carbon dioxide discharged from a processing facility for thermal oxidative decomposition into a liquid and a gas, and an alkali absorption tank for absorbing the carbon dioxide separated from the gas-liquid separation means. So
By converting CO ₂ in the gas component from the gas-liquid separator into an alkali salt with an alkali agent in the alkali absorption tank, CO ₂ can be completely removed, and exhaust gas discharged from the organic halide treatment facility can be removed. It can be zero.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an organic halide treatment facility according to a first embodiment.

FIG. 2 is a schematic diagram of an organic halide treatment facility according to a second embodiment.

FIG. 3 is a schematic diagram of an organic halide treatment facility according to a third embodiment.

FIG. 4 is a schematic diagram of an organic halide treatment facility according to a fourth embodiment.

[Explanation of symbols]

12 Treatment liquid 13 gas components 14 liquid components 15 Gas-liquid separation means 16 Alkali absorption tank 120 Hydrothermal oxidative decomposition treatment facility 1001 object 1002 Hazardous substances (eg PCB) 1003 containers 1004 Separation means 1005 Dismantling method 1006 Pretreatment means 1007 organic matter 1008 inorganic 1009 Separation means 1010 cleaning solution 1011 Cleaning means 1012 Wash waste liquid 1013 Hazardous substance decomposition processing means 1014 slurry 1015 Slurrying means 1020 Vacuum heating device 1021 supply line 1022 exhaust gas 1023 supply line

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01J 3/02 101 C07B 37/06 B09B 5/00 C07C 25/18 C07B 37/06 B01D 53/34 135Z C07C 25/18 B09B 5/00 Z (72) Inventor Masakazu Tateishi 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Co., Ltd. Nagasaki Laboratory F-term (reference) 2E191 BA13 BC01 BD11 4D002 AA09 AC10 BA02 CA06 DA02 DA12 EA02 EA06 4D004 AA22 AB06 CA02 CA13 CA27 CA34 CA39 CC03 CC12 DA02 DA06 DA07 4H006 AA05 AC13 AC26

Claims (10)

[Claims] 1. An organic halide treatment facility for decomposing an organic halide or a harmful substance containing the organic halide, wherein carbon dioxide exhausted from the treatment facility for hydrothermal oxidative decomposition of the harmful substance is used. An organic halide, comprising: a gas-liquid separating means for separating a treatment liquid containing the liquid into a liquid, and an alkali absorption tank for absorbing carbon dioxide (CO ₂ ) separated from the gas-liquid separating means. Processing equipment. 2. The treatment facility for decomposing toxic substances according to claim 1, wherein the treatment facility for decomposing the toxic substance undergoes a dehalogenation reaction and an oxidative decomposition reaction of the organic halide in the presence of carbonate in the heated and pressurized reaction tower. An organic halide treatment facility, which is a hydrothermal oxidative decomposition device for decomposing substances, carbon dioxide (CO ₂ ) and the like. 3. The hydrothermal oxidative decomposition apparatus according to claim 2, wherein the hydrothermal oxidative decomposition apparatus has a cylindrical reaction tower, and each treatment of oil or organic solvent, organic halide, water (H ₂ O) and sodium hydroxide (NaOH). A pressurizing pump that pressurizes the liquid into the reaction tower, a preheater that preheats the water, a high-pressure oxygen supply unit, a cooler that cools the processing liquid from the reaction tower, and a gas-liquid separation of the processing liquid. An organic halide treatment facility comprising a gas-liquid separating means and a pressure reducing valve. 4. The organic halide according to claim 3, wherein the reaction tower comprises a plurality of reaction towers or a second reaction tower having a structure in which a pipe is spirally wound after the first reaction tower. Processing equipment. 5. The organic halogen according to claim 1, further comprising a supply line for supplying oxygen separated from the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. Compound treatment equipment. 6. The organic halogen according to claim 2, further comprising a supply line for supplying the carbonate produced in the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. Compound treatment equipment. 7. A pretreatment unit having one or both of a withdrawing unit for extracting a harmful substance from the object to be treated and a disassembling unit for disassembling the object to be treated, and an object to be treated treated by the pretreatment unit. Separation means for separating organic materials such as paper, wood, resin, etc. and inorganic materials such as metals from the constituent materials that make up the toxic substances separated by pretreatment means in the subcritical region in the presence of carbonate in the presence of carbonates A hydrothermal oxidative decomposition treatment device for treating, a gas-liquid separating means for separating a treatment liquid containing carbon dioxide (CO ₂ ) discharged from the hydrothermal oxidative decomposition treating device into a gas and a liquid, and a gas-liquid separating means. And an alkali absorption tank which absorbs carbon dioxide (CO ₂ ), and an organic halide treatment system. 8. A pretreatment means having one or both of a withdrawing means for withdrawing harmful substances from the object to be treated and a disassembling means for disassembling the object to be treated, and an object to be treated treated in the pretreatment means. Separation means for separating organic substances such as paper, wood, and resin and inorganic substances such as metals from the constituent materials that make up the harmful substances adhering to the processed material from which the harmful substances are extracted or the disassembled constituent materials. Vacuum heating means for vaporizing impregnated harmful substances by vacuum heating, and hydrothermal oxidative decomposition treatment device for hydrothermal oxidative decomposition treatment of harmful substances separated by pretreatment means in the presence of carbonate in the subcritical region And a supply line for supplying carbon dioxide (CO ₂ ) discharged from the hydrothermal oxidative decomposition treatment device to the vacuum heating means, and carbon dioxide (CO ₂ ) discharged from the vacuum heating means.
An organic halide treatment system comprising: an alkali absorption tank that absorbs. 9. The organic halide treatment system according to claim 7, further comprising a supply line for supplying oxygen separated from the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus. 10. The organic halide treatment system according to claim 7 or 8, further comprising a supply line for supplying the carbonate produced in the alkali absorption tank to the hydrothermal oxidative decomposition treatment apparatus.