JP2002336834A - Treatment method and equipment for organic chlorine compound in soil, solid and fly ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove organic chlorine compounds from soil, solids and fly ash contaminated by the organic chlorine compounds, such as dioxins, to reuse all of drugs used and to replenish the drugs only by as much as the amount used for decomposition and reaction. SOLUTION: An organic solvent which is capable of easily extracting the organic chlorine compounds, such as the dioxins, and is low in boiling point is mixed with the contaminated soil, solids and fly ash to extract the organic chlorine compd. The organic solvent containing such organic chlorine compounds is subjected to dewatering and thickening and is fed together with a polar organic solvent and alkali into a reaction chamber where the organic chlorine compounds are decomposed. The solvent for extraction is recovered from the condensate produced in the reaction chamber and the reaction end liquid is circulated, by which the remaining solvent for extraction, the polar organic solvent and the unreacted alkali are reutilized in the system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to fly ash (hereinafter simply referred to as "fly ash") discharged from a soil or solid matter or waste treatment equipment contaminated with harmful organic chlorine compounds such as dioxins.
Etc.) and a treatment method and apparatus for removing an organic chlorine compound.

[0002]

2. Description of the Related Art Generally, methods for decomposing dioxins include a thermal decomposition method, a supercritical hydroxylation decomposition method, and a chemical treatment method. Among these treatment methods, the thermal decomposition method and the supercritical hydroxylation decomposition method require high temperature or high pressure,
Equipment costs and running costs tend to be high. On the other hand, among the chemical treatment methods, a method of decomposing dioxins by adding an alkali such as sodium hydroxide to a polar organic solvent such as dimethyl sulfoxide and 1,3-dimethyl-2-imidazolidinone is Processing can be performed at a relatively low temperature, and processing costs can be reduced.

[0003] Also, JP-A-11-5099 discloses that
Dioxins in sludge are treated with acetone, acetonitrile,
Extracted into organic solvent such as benzene, DMSO, etc., and separated and concentrated the organic solvent containing dioxins from the sludge by separating, washing, and dewatering operations to obtain dehydrated sludge containing almost no dioxins, and containing dioxins. A technique of decomposing and removing dioxins by treating an organic solvent with ozone and ultraviolet rays is disclosed.

[0004]

However, even if a method of decomposing dioxins by adding an alkali to a polar organic solvent is used, it is difficult to throw the object to be treated into the polar organic solvent as it is and to treat it. Needs to be heated, resulting in an increase in cost. Further, unreacted alkali, polar organic solvent, and the like remain on the target object after the treatment, washing with water is required for removal, and equipment for washing water treatment is required. In addition, extraction of dioxins into a polar organic solvent is rate-determining, and the processing time tends to be long. Further, since the used organic solvent and unreacted alkali cannot be separated and recovered, it is necessary to add a lot of new chemicals, and the amount of chemicals used increases.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to easily extract an organic chlorine compound such as dioxins into contaminated soil, contaminated solid matter, and fly ash which are to be treated. Extracting organic chlorine compounds by mixing organic solvents with a low boiling point, dehydrating and concentrating the organic solvents containing these organic chlorine compounds, and putting them in a reaction tank together with polar organic solvents and alkalis to decompose the organic chlorine compounds. By
Compared to the case where the object to be treated is directly poured into a polar organic solvent, the running cost such as heating is greatly reduced, and the reaction residue and unreacted alkali are prevented from entering the treated soil, solids and fly ash. And the extraction time of organic chlorine compounds is easy and the processing time is short, the removal of organic solvents from soil, solids and fly ash is easy, and the occurrence of secondary pollution can be suppressed. It is an object of the present invention to provide a method and an apparatus for treating organochlorine compounds in soil, solid matter, and fly ash, which can reduce the size of a reaction tank and the like because of concentration of chlorination.

[0006] Another object of the present invention is to recover the organic solvent used for extraction from the condensation generated during the decomposition reaction, transfer a part of the solution after the reaction to a salt recovery step, and circulate the other solution. By reusing, the organic solvent for extraction can be recovered and reused in the system, and a part of the polar organic solvent and alkali for the reaction can be circulated and reused in the system, An object of the present invention is to provide a method and an apparatus for treating organochlorine compounds in soil, solid matter, and fly ash, which can minimize addition of a new chemical. Also,
An object of the present invention is to recover the organic solvent used for extraction from the condensation generated in the reaction tank, circulate and reuse a part of the solution after the reaction, and extract the other solution into the organic solvent. The chloride in the contained alkali is separated by the difference in solubility in alcohol such as ethanol, and the alkali is recovered, thereby efficiently recovering the organic solvent for extraction and the polar organic solvent for reaction and the alkali, respectively. Provide a method and apparatus for treating organic chlorine compounds in soil, solids, and fly ash, which can be reused in the system and chlorides such as sodium chloride can be recovered in a state that does not contain solvents. Is to do.

Another object of the present invention is not only a method for decomposing dioxins but also a method for decomposing by dioxin using a plasma, as well as a method for decomposing dioxins with a polar organic solvent.
By passing the concentrated solvent through activated carbon to once adsorb and remove the organic chlorine compound, heating the activated carbon that has adsorbed the organic chlorine compound to decompose it, or by directly passing the concentrated solvent through the heated activated carbon to decompose it Provided is a method and apparatus for treating organochlorine compounds in soil, solid matter, and fly ash that can decompose dioxins with a simple configuration without using chemicals such as polar organic solvents and alkalis for reaction. It is in.

[0008]

In order to achieve the above object, a method for treating organochlorine compounds in soil, solid matter, and fly ash according to the present invention is directed to a method for treating soil, solid matter or soil contaminated with organochlorine compounds. And / or mixing the fly ash with an organic solvent for extracting an organic chlorine compound and extracting the organic chlorine compound into the organic solvent, and the soil, solid matter or / and the organic solvent containing the fly ash and the organic chlorine compound. After solid-liquid separation, the separated soil, solid matter or / and fly ash are heated and dried or / and decompressed to remove the residual organic solvent from the soil, solid matter or / and fly ash; A dehydration / concentration step of dehydrating the organic solvent after extraction of the organic chlorine compound obtained by liquid separation by heating or / and reducing pressure, and concentrating the organic solvent after dehydration by heating or / and reducing pressure; Concentrated organic solvent In which an organic chlorine compound is decomposed by reacting with an alkali in a polar organic solvent for decomposing an organic chlorine compound, and an organic solvent and a polar organic solvent which are extracted from the condensate obtained from the reaction solution during the decomposition reaction A circulation step of circulating the reaction-terminated solution after collecting the condensate and introducing the solution again into the decomposition step.
The organic solvent for extraction, the polar organic solvent, and the alkali are configured to be reused in the system (see FIGS. 1, 2, and 3).

In the above-mentioned method, a part of the reaction solution after the decomposition reaction is extracted, and the used salts consisting of chloride and alkali, which are reaction products, are removed and recovered from the organic solvent for extraction and the polar organic solvent. It is preferable to introduce the extracted organic solvent and polar organic solvent into the circulation step (FIG. 2).
reference). Further, in the above method, a part of the reaction solution after the decomposition reaction is extracted and separated into solid and liquid, and the organic solvent for extraction and the polar organic solvent on the liquid side are collected and introduced into the circulation step, and the solid that is separated into solid and liquid is separated. The side is dissolved in an alcohol (for example, ethanol) to separate the alkali and the reaction product chloride contained in the residual organic solvent depending on the difference in the solubility in the alcohol.
And separate and recover the alcohol by decompression, respectively,
It is preferable to introduce the recovered alkali into the decomposition step and to recycle the separated alcohol (see FIG. 3).

In these methods, it is preferable that the organic solvent for extraction and the polar organic solvent recovered from the condensate obtained from the reaction solution undergoing the decomposition reaction be returned to the stage prior to the dehydration treatment in the dehydration / concentration step (FIG. 1, FIG. 2,
(See FIG. 3). In these methods, before the organic solvent in which the organic chlorine compound is concentrated is subjected to the decomposition reaction together with the polar organic solvent for decomposing the organic chlorine compound and the alkali, the organic solvent is heated using the heat of the reaction solution after the decomposition reaction. (See FIGS. 1, 2 and 3). In these methods, the water contained in the soil, solid matter and / or fly ash is removed in the extraction step and the subsequent dehydration / concentration step,
The decomposition reaction in the decomposition step can be performed in an anhydrous state.

[0011] The method of the present invention further comprises the step of extracting soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound and extracting the organochlorine compound into the organic solvent. After solid-liquid separation between the process and the soil, solids or / and fly ash and the organic solvent containing an organochlorine compound, the separated soil, solids or / and fly ash are heated and dried or / and reduced in pressure. A separation / removal step of removing residual organic solvent from soil, solid matter or / and fly ash, and a dehydration treatment of the organic solvent after extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and decompression, and dehydration treatment It is characterized by including a dehydration / concentration step of concentrating the organic solvent by heating or / and reducing the pressure, and a pyrolysis step of thermally decomposing the organic solvent in which the organic chlorine compound is concentrated by plasma (see FIG. 4). .

[0012] The method of the present invention further comprises the steps of extracting soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound and extracting the organochlorine compound into the organic solvent. After solid-liquid separation between the process and the soil, solids or / and fly ash and the organic solvent containing an organochlorine compound, the separated soil, solids or / and fly ash are heated and dried or / and reduced in pressure. A separation / removal step of removing residual organic solvent from soil, solid matter or / and fly ash, and a dehydration treatment of the organic solvent after extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and decompression, and dehydration treatment A dehydration / concentration step of concentrating the organic solvent by heating or / and reduced pressure, and passing the organic solvent in which the organic chlorine compound is concentrated through activated carbon to adsorb and remove the organic chlorine compound, and heating and adsorbing the used activated carbon Yes The chlorine compounds are characterized in that it comprises a thermally decomposing adsorbed pyrolysis process (see FIG. 5).

[0013] The method of the present invention further comprises the step of extracting soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound and extracting the organochlorine compound into the organic solvent. After solid-liquid separation between the process and the soil, solids or / and fly ash and the organic solvent containing an organochlorine compound, the separated soil, solids or / and fly ash are heated and dried or / and reduced in pressure. A separation / removal step of removing residual organic solvent from soil, solid matter or / and fly ash, and a dehydration treatment of the organic solvent after extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and decompression, and dehydration treatment Includes a dehydration / concentration step of concentrating the subsequent organic solvent by heating or / and reduced pressure, and a pyrolysis step of directly thermally decomposing the organic chlorine compound by passing the organic solvent enriched with the organic chlorine compound through heated activated carbon. This It is characterized (see FIG. 6, FIG. 7).

In these methods, the organic solvent for extraction after removing the organic chlorine compound by thermal decomposition or adsorption is
It is preferable to return to the stage before the dehydration treatment in the dehydration / concentration step (see FIGS. 5 and 6). In these methods, it is preferable that the organic solvent before the dehydration treatment is heated using the heat of the distilled organic solvent obtained by the concentration operation by heating (see FIGS. 1 to 7). Further, in these methods, soil, solid matter or / and fly ash are mixed with an organic solvent for extracting an organic chlorine compound, and an organic solvent is used to extract the organic chlorine compound. The step of separating from the organic solvent containing a chlorine compound is repeated at least twice, and finally the separated soil, solid matter or /
It is preferable to remove the residual organic solvent from the soil, solid matter, and / or fly ash by heating and / or drying and / or reducing the pressure of the fly ash (see FIGS. 1 to 7).

In these methods of the present invention, benzene, toluene, xylene, ethylbenzene, propylbenzene, cyclohexane, methylcyclohexane, hexane, heptane, heptane, octane, morpholine and methylmorpholine are used as organic solvents for extracting an organic chlorine compound. One or more selected from the group consisting of: Examples of the polar organic solvent for decomposing an organic chlorine compound when reacting with an alkali include sulfolane, dimethyl sulfoxide, 1,3-dimethyl-2-imidazolidinone, tetramethylene sulfolane, dimethyl polyalkylene glycol, and tetramethyl urea. And N
One or more selected from the group consisting of -methylpyrrolidone can be used. Examples of the organochlorine compound contained in soil, solid matter, and / or fly ash include dioxins, and the method of the present invention can treat dioxins in soil, solid matter, and fly ash.

The apparatus for treating organochlorine compounds in soil, solid matter and fly ash according to the present invention comprises mixing soil, solid matter and / or fly ash contaminated with organochlorine compounds with an organic solvent for extracting organochlorine compounds. Extraction means for extracting an organic chlorine compound into an organic solvent and solid-liquid separation of soil, solid matter or / and fly ash and an organic solvent containing an organic chlorine compound, and the separated soil, solid matter or / and fly Separation means for removing the residual organic solvent from the soil, solid matter or / and fly ash by heating and / or depressurizing the ash; and heating or / or heating the organic solvent after the extraction of the organochlorine compound obtained by the solid-liquid separation. And a dehydrating means for dehydrating under reduced pressure, a concentrating means for heating or / and concentrating the organic solvent after dehydrating, and an organic solvent in which the organic chlorinated compound is concentrated in a polar organic solvent for decomposing the organic chlorine compound. Arca Reaction means for decomposing the organic chlorine compound by reacting with the organic solvent; condensing means for condensing and recovering the gaseous organic solvent for extraction generated in the reaction means; and A circulation means for reusing the solvent, the polar organic solvent and the alkali, so that the organic solvent for extraction, the polar organic solvent and the alkali can be reused in the system (FIGS. 1 and 1). 2, see FIG. 3).

In the above apparatus, the extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and the reaction means. Can be composed of a slurry adjusting tank and a reaction tank (see FIGS. 1, 2 and 3).
In this case, a heat exchanger is provided in a pipe connecting the slurry adjusting tank and the reaction tank, and the adjusted slurry supplied to the reaction tank is heated by exchanging heat with the reaction solution after the decomposition reaction. (See FIGS. 1, 2 and 3).

In the above-mentioned apparatus, a part of the reaction-terminated liquid is withdrawn from the reaction means to remove used salts consisting of chloride and alkali as reaction products from the organic solvent for extraction and the polar organic solvent. It is preferable that the organic solvent for extraction and the polar organic solvent which are collected and separated are introduced into a circulating means to have a salt collecting means. in this case,
The salt recovery means can be configured to include a filter and a dryer (see FIG. 2). Further, in the above-mentioned apparatus, a solid-liquid separation means for extracting a part of the reaction-completed liquid from the reaction means and recovering the liquid-side extraction organic solvent and the polar organic solvent by solid-liquid separation, and a solid-liquid separated solid Dissolve the alcohol in the alcohol side and separate the alkali and the reaction product chloride contained in the residual organic solvent according to the difference in the solubility in the alcohol, and heat-dry the chloride and alkali and / or separate the alcohol by reduced pressure. It is preferable to adopt a configuration provided with a separation / recovery means for recovering each of them and circulating and using the recovered alkali. In this case, the solid-liquid separation means may be constituted by a filter, and the separation / recovery means may be constituted by a dissolution tank, a filter and a dryer (see FIG. 3).

[0019] The apparatus of the present invention is also adapted to extract soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound to extract the organochlorine compound into the organic solvent. Means, solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound,
Heating and drying the separated soil, solid matter or / and fly ash
Separation means for removing the residual organic solvent from the soil, solid matter or / and fly ash by reducing the pressure, and dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by the solid-liquid separation by heating or / and reducing the pressure. Dehydration means, and concentration means for concentrating the organic solvent after dehydration by heating or / and reduced pressure,
It is characterized in that it includes a thermal decomposition means for thermally decomposing an organic solvent in which an organic chlorine compound is concentrated by plasma (see FIG. 4). In the above apparatus, the extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and the thermal decomposition treatment means It can be configured to include a plasma generator, a reaction vessel, an inert gas (eg, argon gas) tank, a neutralizing agent (eg, sodium hydroxide) tank, and an oxidizing agent (eg, oxygen) tank (FIG. 4). reference).

[0020] The apparatus of the present invention further comprises an extraction step of mixing soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound to extract the organochlorine compound into the organic solvent. Means, solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound,
Heating and drying the separated soil, solid matter or / and fly ash
Separation means for removing the residual organic solvent from the soil, solid matter or / and fly ash by reducing the pressure, and dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by the solid-liquid separation by heating or / and reducing the pressure. Dehydration means, and concentration means for concentrating the organic solvent after dehydration by heating or / and reduced pressure,
Adsorption / pyrolysis means for adsorbing and removing the organic chlorine compound by passing an organic solvent enriched with the organic chlorine compound through activated carbon and heating the used activated carbon to thermally decompose the adsorbed organic chlorine compound. (See FIG. 5). In the above apparatus, the extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and an adsorption / pyrolysis means. Can be composed of an activated carbon adsorption tower and a heating reactor (see FIG. 5).

[0021] The apparatus of the present invention further comprises an extraction step of mixing soil, solid matter and / or fly ash contaminated with an organochlorine compound with an organic solvent for extracting the organochlorine compound to extract the organochlorine compound into the organic solvent. Means, solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound,
Heating and drying the separated soil, solid matter or / and fly ash
Separation means for removing the residual organic solvent from the soil, solid matter or / and fly ash by reducing the pressure, and dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by the solid-liquid separation by heating or / and reducing the pressure. Dehydration means, and concentration means for concentrating the organic solvent after dehydration by heating or / and reduced pressure,
It is characterized in that it includes a pyrolyzing means for directly pyrolyzing the organic chlorine compound by passing an organic solvent in which the organic chlorine compound is concentrated through heated activated carbon (see FIGS. 6 and 7). In the above apparatus, the extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and the pyrolysis means comprises activated carbon. It can be configured as a reaction vessel (see FIGS. 6 and 7).

In these apparatuses, a heat exchanger is provided before the dehydrating means, and the organic solvent introduced into the dehydrating means is heated by exchanging heat with the distilled organic solvent from the concentrating means. (See FIGS. 1 to 7).

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. FIG. 1 shows a schematic configuration of an apparatus for performing a method for treating an organochlorine compound in soil, solid matter, and fly ash according to a first embodiment of the present invention. In the present embodiment, as an example, a case where soil contaminated with dioxins is treated is described. As shown in FIG. 1, the contaminated soil is received by a supply hopper 1 by a conveyor such as a conveyor, and a required amount is put into an extraction tank 4 provided with stirring and mixing means. Dioxins are extracted from the contaminated soil by charging a required amount of solvent from the solvent tanks 2 and 3 into the extraction tank 4 and mixing them.
As the organic solvent for extracting dioxins, dioxins are easily extracted and solvents having a low boiling point, for example, benzene, toluene, xylene, ethylbenzene, propylbenzene, cyclohexane, methylcyclohexane,
Hexane, heptane, octane, morpholine, methylmorpholine and the like are used. These organic solvents can be extracted at around room temperature, but it is desirable to heat the extraction tank 4 to perform the extraction operation. More desirably, extraction at a temperature below the boiling point of the solvent and above the boiling point of water increases the extraction efficiency.

The extraction slurry that has left the extraction tank 4 is temporarily stored in an extraction slurry tank 5 and guided to a filter 6 to separate solid and liquid.
Note that a centrifuge may be used instead of the filter 6,
Further, as other solid-liquid separation means, for example, a pressure type, a vacuum type, a belt filter, a filter press, a screw press, a rotary press, and the like can be used. The solid cake is led to the washing tank 7, and the solvent tanks 2, 3
After washing with the solvent from the above, the solution is guided to the filter 6 again through the washing slurry tank 8 and solid-liquid separated. After repeating this plural times, the finally separated solid cake is guided to the dryer 9 by operating a switching valve or the like, and the residual solvent is removed by heating or / and reducing the pressure to collect the treated soil. As mentioned above,
Since the boiling point of the organic solvent is low, the organic solvent can be easily removed from the soil by slightly heating or depressurizing. Therefore, not only dioxins are not contained in the obtained treated soil, but also no organic solvent remains, and the occurrence of secondary pollution can be suppressed.

The solvent containing dioxins separated in the filter 6 is received in the extract tank 12 and then heated in the heat exchanger 13 by exchanging heat with a distillation solvent from a distillation column 15 described later. . The solvent recovered in the subsequent stage is also collectively received in the extract tank 12. The preheated extraction solvent is led to a distillation column 14 for dehydration treatment to perform dehydration. Then, the solvent separated and removed by the dryer 9 is condensed by the condenser 10 and received by the condensing tank 11, and the dehydrated solvent is removed. It leads to a distillation column 15 for performing concentration, for example,
The dioxins contained in the solvent are concentrated at a temperature of 100 to 144 ° C. and a pressure of 102 to 105 Pa (when the extraction solvent is morpholine). The main purpose of the distillation column 15 is to concentrate dioxins in the solvent. However, the evaporated and clean solvent is recovered after using heat in the heat exchanger 13, returned to the solvent tank 3, and reused. The product gas containing low-molecular-weight organic substances and the like separated and recovered by distillation in the distillation columns 14 and 15 is sent to a gas treatment process such as activated carbon adsorption, and the water separated and recovered by distillation in the distillation column 14 is sent to a water treatment process. . As described above, even when moisture is contained in the soil, the moisture is removed by the distillation column 14, and the next reaction step can be performed in an anhydrous state.

The dioxin-containing solvent concentrated in the distillation column 15 passes through the concentrate tank 16 and the slurry adjustment tank 1
Send to 7. The required amount of particulate or powdery NaOH from the NaOH tank 19 and the required amount of DMI (1,3-dimethyl-2-imidazolidinone) from the DMI tank 18 are fed into the slurry adjusting tank 17 and mixed. Generate a slurry. The adjusted slurry from the slurry adjusting tank 17 is heated by exchanging heat with a circulating slurry after the reaction from the reaction tank 21 described later in the heat exchanger 20, and then is introduced into the reaction tank 21. Note that other alkalis can be used instead of NaOH. Also, polar organic solvents other than DMI, for example, sulfolane, dimethyl sulfoxide,
It is also possible to use tetramethylene sulfolane, dimethylpolyalkylene glycol, tetramethylurea, N-methylpyrrolidone and the like as polar organic solvents for dioxin decomposition. In the reaction tank 21, for example, 150 to
By stirring while heating at a temperature of about 220 ° C., a dechlorination reaction of dioxins is carried out to render them harmless.

The slurry after the reaction contains an extraction solvent, DM
I, unreacted NaOH, NaCl as a reaction product, and other reaction products (decomposition products of dioxins). Since reaction products such as an extraction solvent and low molecular organic substances are discharged in a gaseous state from the reaction tank 21, the reaction products are condensed by the condenser 23 and received by the condensation tank 24.
It is returned to the extract tank 12. The reaction-terminated liquid (slurry) is received in the reaction liquid tank 22, and is circulated to the slurry adjustment tank 17 via heat utilization in the heat exchanger 20. Removal of reaction residues (NaCl, NaOH, etc.) from the reaction completed solution,
Regarding a configuration in which NaOH as an alkali is recovered from the reaction end solution and reused, the following second and third embodiments will be described.
It will be described in the form.

FIG. 2 shows a schematic configuration of an apparatus for carrying out a method for treating an organic chlorine compound in soil, solid matter and fly ash according to a second embodiment of the present invention. As shown in FIG.
The reaction-terminated liquid received in the reaction liquid tank 22 from the reaction tank 21 is returned again to the slurry adjustment tank 17 and circulated, but a part of the liquid is extracted and guided to the filter 25. In addition, as a filter, centrifugal separation, a belt filter,
A leaf filter, a filter press and the like are used. The main purpose of the filter 25 is to use NaOH insoluble in the extraction solvent and DMI.
And NaCl by filtration. Spent salts (NaCl and Na) which are reaction residues filtered off by the filter 25
The OH mixture) is recovered by drying in a dryer 26, and the evaporated components (extraction solvent and DMI) are converted into a liquid in a condenser 27, and the filtrate (extraction solvent and D
MI), and all are returned to the slurry adjustment tank 17 via the reaction solution tank 22 for reuse. Other configurations, operations, and the like are the same as those in the first embodiment.

FIG. 3 shows a schematic configuration of an apparatus for performing a method for treating an organic chlorine compound in soil, solid matter, and fly ash according to a third embodiment of the present invention. As shown in FIG.
The reaction-terminated liquid received in the reaction liquid tank 22 from the reaction tank 21 is returned to the slurry adjustment tank 17 and circulated, but a part of the liquid is extracted and guided to the filter 28. The filtrate (solvent for extraction and DMI) from the filter 28 is supplied to the reaction solution tank 2
After passing through 2, all of them are returned to the slurry adjustment tank 17 for reuse. The reaction residue filtered off by the filter 28 is sent to a dissolution tank 29, dissolved by ethanol introduced from an ethanol tank 35, and the slurry is subjected to solid-liquid separation by a filter 30. Since NaCl, which is a reaction product, has a low solubility in ethanol, and NaOH has a high solubility in ethanol, the two can be separated from each other by this difference in solubility. That is, NaCl which is a reaction product is contained on the solid side, and the NaCl can be separated by drying it with the dryer 33. On the other hand, ethanol and N
It contains aOH and residual solvent and is separated in a dryer 31 into ethanol and other substances. The evaporated ethanol is recovered from the dryers 31 and 33, and the condenser 3
The liquid is made into a liquid in 2 and 34 and returned to the ethanol tank 35 for reuse. NaO from which ethanol was separated by dryer 31
H (including a small amount of solvent) is returned to the slurry adjustment tank 17 and reused. In addition, using a substance other than ethanol, an alkali such as NaOH and NaCl which is a reaction product are used.
And the like can be separated by the difference in solubility.
Other configurations, operations, and the like are the same as those in the first embodiment.

FIG. 4 shows a schematic configuration of an apparatus for carrying out a method for treating an organic chlorine compound in soil, solid matter, and fly ash according to a fourth embodiment of the present invention. As shown in FIG.
The solvent containing dioxins concentrated in the distillation column 15 is introduced into the reaction vessel 38 from the plasma generator 36 via the concentrate tank 16. Argon gas is supplied to the plasma generator 36 from an argon tank 37, and an ultra-high temperature (for example, 10000) is generated by arc discharge in an argon gas atmosphere.
℃ or more). In the plasma generator 36, dioxins are instantaneously thermally decomposed to atomic or ionic levels by ultra-high temperature plasma. The reaction vessel 38 is supplied with a neutralizing agent (for example, NaOH) from a neutralizing agent tank 39 and oxygen from an oxygen tank 40, respectively.
These atoms and the like that are thermally decomposed in the above are converted into low molecular substances such as water, carbon dioxide, and sodium chloride that comply with environmental standards. Then, the discharged waste liquid is subjected to removal of water and sodium chloride by the condenser 41. Other configurations, operations, and the like are the same as those in the first embodiment.

FIG. 5 shows a schematic configuration of an apparatus for performing a method for treating an organic chlorine compound in soil, solid matter, and fly ash according to a fifth embodiment of the present invention. As shown in FIG.
The solvent containing dioxins concentrated in the distillation tower 15 is introduced into the activated carbon adsorption tower 42 via the concentrate tank 16.
As the activated carbon to be filled in the activated carbon adsorption tower 42, commercially available activated carbon, activated carbon produced by carbonizing and activating waste or sludge, or the like can be used. In the activated carbon adsorption tower 42, dioxins contained in the solvent are adsorbed and removed by the activated carbon, and a clean solvent is discharged. This solvent can be circulated to the extract tank 12 and reused.
Although not shown, the activated carbon having adsorbed dioxins is extracted from the activated carbon adsorption tower 42 and subjected to thermal decomposition.
As an example of the thermal decomposition treatment of used activated carbon, N
a, K, Mg, Ca, Ba, Zn, Ni, Pb, Ti,
A method of heating at 200 to 550 ° C. in an oxygen-deficient state using Cu, Fe, Al, Pt, V, W, Mo, Rh or Cr or an oxide or salt thereof as a catalyst is used. Other configurations, operations, and the like are the same as those in the first embodiment.

FIGS. 6 and 7 show a schematic configuration of an apparatus for carrying out a method for treating an organic chlorine compound in soil, solid matter and fly ash according to a sixth embodiment of the present invention. As shown in FIG. 6, the solvent containing dioxins concentrated in the distillation column 15 is introduced into the activated carbon reaction vessel 43 via the concentrate tank 16. As the activated carbon to be filled in the activated carbon reaction vessel 43, commercially available activated carbon, activated carbon produced by carbonizing and activating waste, sludge, and the like can be used. In the activated carbon reaction vessel 43, for example, oxygen-free activated carbon is heated to about 600 ° C. by an electric furnace or the like, and dioxins contained in the solvent are reduced and decomposed by the activated carbon. The treated solvent discharged from the activated carbon reaction vessel 43 is condensed by the condenser 44, circulated to the extract tank 12, and reused. Further, as shown in FIG. 7, the treated solvent discharged from the activated carbon
In step 4, it is also possible to separate into a solvent and a reaction residue and perform one-through processing. Other configurations and operations are the same as those of the first embodiment.
This is the same as in the case of the form.

[0033]

As described above, the present invention has the following effects. (1) In the present invention, an organic chlorine compound is extracted by mixing an extraction solvent with soil, solid matter, and fly ash contaminated with an organic chlorine compound such as dioxins, and the solvent containing the organic chlorine compound is dehydrated. Concentrates and reacts with alkali in a polar organic solvent to decompose the organochlorine compound, so that the content of the organochlorine compound can be extremely reduced and the treated soil, treated solids, Recovery can be performed without leaving any solvents in the ash, and in the case of soil, the recovered treated soil can be reused as ordinary general soil. (2) After collecting the condensate generated during the decomposition reaction, a part of the solution after the reaction is sent to the salt recovery step, and the other solution is recycled and reused, so that a simpler structure can be used. The organic solvent can be recovered and reused in the system, and the remaining organic solvent for extraction, polar organic solvent for reaction such as DMI, and part of the alkali (NaOH, etc.) can be circulated and reused in the system. can do. (3) After recovering the organic solvent used for extraction from the condensation generated in the reaction tank, a part of the solution after the reaction is circulated and reused, and the other solution is extracted to remove the alkali contained in the organic solvent. (NaOH, etc.) in chloride (N
aCl) is separated by the difference in solubility in alcohols such as ethanol, and by recovering alkalis such as NaOH, the organic solvent used for extraction and the polar organic solvent such as DMI used in the reaction and NaOH etc. It is possible to separate and collect all unreacted alkali products,
Since each can be reused in the system, the amount of drug used can be saved. In addition, the reaction product chloride (Na
Cl, etc.) can be recovered as a solid, and other reaction products can be easily separated and recovered by distillation, and can be easily processed in a water treatment system or a gas treatment system.

(4) Water contained in the soil (or solid matter or fly ash) is removed in the extraction step and the subsequent dehydration / concentration step, and the reaction step can be carried out in an anhydrous state. It can also handle solids and fly ash). (5) In the present invention, the running cost such as heating is greatly reduced as compared with the case where the soil, solid matter and fly ash are directly added to the polar organic solvent, and the treated soil, solid matter and fly ash are reduced. Of the reaction residue or unreacted alkali can be prevented. Therefore, it is not necessary to wash the soil, solid matter or fly ash after the treatment, and equipment for treating the washing water is not required. (6) Organic chlorine compounds such as dioxins can be easily extracted, and by using an organic solvent having a low boiling point, the extraction of the organic chlorine compounds can be easily performed at a low temperature. Is also advantageous. Further, since the boiling point of the organic solvent is low, it can be easily removed from soil, solid matter, and fly ash by a small amount of heating or decompression, and the occurrence of secondary pollution can be suppressed. (7) As a method of decomposing dioxins, a method of decomposing by plasma, a method of once passing an enriched solvent through activated carbon to adsorb and remove an organic chlorine compound, heating the activated carbon having adsorbed the organic chlorine compound to decompose it, and a direct enrichment method Dioxins can be decomposed with a simple structure without using a chemical such as a polar organic solvent for reaction or an alkali by employing a method in which the solvent is passed through heated activated carbon to decompose. (8) In the dehydration / concentration step of the solvent from which the organochlorine compound is extracted and the decomposition step in which the solvent in which the organochlorine compound is concentrated is reacted with an alkali in a polar organic solvent, heat can be effectively used, so that energy consumption is Can be suppressed.

[Brief description of the drawings]

FIG. 1 shows soil, solid matter, and the like according to a first embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic structure explanatory drawing which shows the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 2 shows soil, solid matter, and the like according to a second embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic structure explanatory drawing which shows the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 3 shows soil, solid matter, and the like according to a third embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic structure explanatory drawing which shows the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 4 shows soil, solid matter, and the like according to a fourth embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic structural explanatory drawing which shows the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 5 shows soil, solid matter, and the like according to a fifth embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic structure explanatory drawing which shows the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 6 shows soil, solid matter, and the like according to a sixth embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic schematic block diagram which shows an example of the apparatus which implements the processing method of the organic chlorine compound in fly ash.

FIG. 7 shows soil, solid matter, and the like according to a sixth embodiment of the present invention.
It is a systematic schematic block diagram which shows the other example of the apparatus which implements the processing method of the organic chlorine compound in fly ash.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Supply hopper 2 Solvent tank (new) 3 Solvent tank (regeneration) 4 Extraction tank 5 Extraction slurry tank 6, 25, 28, 30 Filter 7 Cleaning tank 8 Cleaning slurry tank 9, 26, 31, 33 Dryer 10, 23 , 27, 32, 34, 41, 44 Condenser 11, 24 Condensation tank 12 Extracted liquid tank 13, 20 Heat exchanger 14, 15 Distillation tower 16 Concentrated liquid tank 17 Slurry adjustment tank 18 DMI tank 19 NaOH tank 21 Reaction tank 22 Reaction Liquid tank 29 Dissolution tank 35 Ethanol tank 36 Plasma generator 37 Argon tank 38 Reaction vessel 39 Neutralizer tank 40 Oxygen tank 42 Activated carbon adsorption tower 43 Activated carbon reaction vessel

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B09B 3/00 C07B 37/06 4H006 ZAB B09B 3/00 304K B09C 1/08 ZAB C07B 35/06 304G 37/06 (72 ) Inventor Masahiro Sugata 1-1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. F-term in the Akashi factory (reference) 2E191 BA12 BB01 BC01 BD11 BD18 4D004 AA37 AA41 AB06 AB07 CA13 CA15 CA22 CA40 CA42 CB05 CB27 CB31 CB44 CC04 DA02 DA07 4D017 AA03 BA04 CA03 CB01 DA07 DB03 4D056 AB01 AC02 AC03 AC06 AC11 AC13 AC18 BA03 BA13 CA06 CA14 CA17 CA18 CA20 CA31 CA39 CA40 4G075 AA37 CA47 4H006 AA04 AA05 AC13 AC26 BB11 BB14 BB18 BB22 BB23 BB24 BB24

Claims (29)

[Claims] 1. An organic chlorine compound is extracted from an organic solvent by mixing fly ash discharged from an apparatus for treating soil, solid matter and / or waste contaminated with the organic chlorine compound with an organic solvent for extracting the organic chlorine compound. Extraction process and soil, solid matter or /
After the solid and liquid separation of the fly ash and the organic solvent containing the organochlorine compound, the soil, solid matter or / and fly ash is obtained by heating and / or depressurizing the separated soil, solid matter or / and fly ash. And a separation / removal step of removing the residual organic solvent from the organic solvent obtained by the solid-liquid separation, and the organic solvent after the extraction is subjected to dehydration treatment by heating or / and reduced pressure, and the organic solvent after the dehydration treatment is heated or / and / or Dehydration to concentrate by reduced pressure
A concentration step, a decomposition step of decomposing the organic chlorine compound by reacting the organic solvent in which the organic chlorine compound is concentrated with an alkali in a polar organic solvent for decomposing the organic chlorine compound, and condensation obtained from the reaction solution during the decomposition reaction Recovering the organic solvent for extraction and the polar organic solvent from the solvent, circulating the reaction-terminated solution after collecting the condensate, and introducing the solution again into the decomposition step. A method for treating organochlorine compounds in soil, solid matter, and fly ash, characterized by reusing in the system. 2. A part of the reaction solution after the decomposition reaction is extracted to remove and recover a used salt composed of chloride and alkali as a reaction product from an organic solvent for extraction and a polar organic solvent, and to separate and extract the salt. 2. The method according to claim 1, wherein the organic solvent and the polar organic solvent are introduced into the circulation step. 3. A part of the reaction solution after the decomposition reaction is withdrawn, separated into solid and liquid, the organic solvent for extraction and the polar organic solvent on the liquid side are collected and introduced into a circulation step, and the solid side after solid-liquid separation is separated. The alkali dissolved in the alcohol and the alkali contained in the residual organic solvent and the chloride as a reaction product are separated by the difference in solubility in the alcohol, and the chloride and the alkali are separated by heating and / or depressurizing to separate the alcohol. While collecting and introducing the recovered alkali to the decomposition process,
The method for treating organic chlorine compounds in soil, solid matter, and fly ash according to claim 1, wherein the separated alcohol is recycled. 4. An extraction organic solvent and a polar organic solvent recovered from the condensation obtained from the reaction solution during the decomposition reaction,
4. The method for treating organochlorine compounds in soil, solid matter, and fly ash according to claim 1, 2 or 3, which is returned to a stage preceding the dehydration treatment in the dehydration / concentration step. 5. An organic solvent enriched with an organic chlorine compound is heated using the heat of the reaction solution after the decomposition reaction before being subjected to the decomposition reaction together with a polar organic solvent for decomposing the organic chlorine compound and an alkali. Item 5. The method for treating an organochlorine compound in soil, solid matter, or fly ash according to any one of Items 1 to 4. 6. The method according to claim 1, wherein water contained in the soil, solid matter and / or fly ash is removed in an extraction step and a subsequent dehydration / concentration step, and the decomposition reaction in the decomposition step is performed in an anhydrous state.
5. The method for treating an organochlorine compound in soil, solid matter, and fly ash according to any one of 5. 7. A fly ash discharged from a soil, solid or / and waste treatment device contaminated with an organochlorine compound is mixed with an organic solvent for extracting an organochlorine compound to extract the organochlorine compound into the organic solvent. Extraction process and soil, solid matter or /
After the solid and liquid separation of the fly ash and the organic solvent containing the organochlorine compound, the soil, solid matter or / and fly ash is obtained by heating and / or depressurizing the separated soil, solid matter or / and fly ash. And a separation / removal step of removing the residual organic solvent from the organic solvent obtained by the solid-liquid separation, and the organic solvent after the extraction is subjected to dehydration treatment by heating or / and reduced pressure, and the organic solvent after the dehydration treatment is heated or / and / or Dehydration to concentrate by reduced pressure
A method for treating an organochlorine compound in soil, solid matter or fly ash, comprising a concentration step and a pyrolysis step of thermally decomposing an organic solvent in which the organochlorine compound is concentrated by plasma. 8. An organic chlorinated compound is extracted from the soil, solid matter and / or fly ash discharged from a waste treatment device, which is contaminated with the organic chlorinated compound, by mixing with the organic solvent for extracting the organic chlorinated compound. Extraction process and soil, solid matter or /
After the solid and liquid separation of the fly ash and the organic solvent containing the organochlorine compound, the soil, solid matter or / and fly ash is obtained by heating and / or depressurizing the separated soil, solid matter or / and fly ash. And a separation / removal step of removing the residual organic solvent from the organic solvent obtained by the solid-liquid separation, and the organic solvent after the extraction is subjected to dehydration treatment by heating or / and reduced pressure, and the organic solvent after the dehydration treatment is heated or / and / or Dehydration to concentrate by reduced pressure
Includes a concentration step and an adsorption / pyrolysis step in which an organic solvent in which the organic chlorine compound is concentrated is passed through activated carbon to adsorb and remove the organic chlorine compound, and the used activated carbon is heated to thermally decompose the adsorbed organic chlorine compound. A method for treating organochlorine compounds in soil, solid matter, and fly ash. 9. An organic chlorine compound is extracted from an organic solvent by mixing fly ash discharged from soil, solid matter and / or waste treatment equipment contaminated with the organic chlorine compound with an organic solvent for extracting the organic chlorine compound. Extraction process and soil, solid matter or /
After the solid and liquid separation of the fly ash and the organic solvent containing the organochlorine compound, the soil, solid matter or / and fly ash is obtained by heating and / or depressurizing the separated soil, solid matter or / and fly ash. And a separation / removal step of removing the residual organic solvent from the organic solvent obtained by the solid-liquid separation, and the organic solvent after the extraction is subjected to dehydration treatment by heating or / and reduced pressure, and the organic solvent after the dehydration treatment is heated or / and / or Dehydration to concentrate by reduced pressure
An organic solvent in soil, solid matter and fly ash, comprising a concentration step and a pyrolysis step of directly pyrolyzing the organic chlorine compound by passing an organic solvent in which the organic chlorine compound is concentrated through heated activated carbon. How to treat chlorine compounds. 10. The soil / solid matter / fly ash according to claim 8 or 9, wherein the organic solvent for extraction after removing the organic chlorine compound by thermal decomposition or adsorption is returned to a stage prior to the dehydration treatment in the dehydration / concentration step. For treating organic chlorine compounds in water. 11. The method according to claim 1, wherein in the dehydration / concentration step, the organic solvent before the dehydration treatment is heated using heat of the distilled organic solvent obtained by the concentration operation by heating. Of organic chlorine compounds in soil, solid matter and fly ash. 12. Mixing soil, solid matter and / or fly ash with an organic solvent for extracting an organic chlorine compound and allowing the organic solvent to extract the organic chlorine compound, and mixing the soil, solid matter or / and fly ash with the organic chlorine compound Is repeated at least twice, and the finally separated soil, solid matter or / and fly ash is heated and dried or / and depressurized to remove the soil, solid matter or / and fly ash. The soil / solid matter / solid matter according to any one of claims 1 to 11, which removes a residual organic solvent.
A method for treating organic chlorine compounds in fly ash. 13. Organic solvents for extracting organic chlorine compounds, such as benzene, toluene, xylene, ethylbenzene,
The soil / solid matter according to any one of claims 1 to 12, wherein at least one selected from the group consisting of propylbenzene, cyclohexane, methylcyclohexane, hexane, heptane, octane, morpholine, and methylmorpholine is used.
A method for treating organic chlorine compounds in fly ash. 14. A polar organic solvent for decomposing an organic chlorine compound, which is selected from the group consisting of sulfolane, dimethyl sulfoxide, and 1,3.
The soil according to any one of claims 1 to 6, wherein at least one selected from the group consisting of -dimethyl-2-imidazolidinone, tetramethylene sulfolane, dimethylpolyalkylene glycol, tetramethylurea, and N-methylpyrrolidone is used.・ Method of treating organic chlorine compounds in solids and fly ash. 15. The organic chlorine compound contained in soil, solid matter and fly ash according to any one of claims 1 to 14, wherein the organic chlorine compound contained in the soil, solid matter and / or fly ash is mainly dioxins. Processing method. 16. Fly ash discharged from soil, solid matter and / or waste treatment equipment contaminated with an organochlorine compound is mixed with an organic solvent for extracting an organochlorine compound to extract the organochlorine compound into the organic solvent. And solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound, and drying and / or depressurizing the separated soil, solids or / and fly ash Depending on the soil, solid matter or /
Separation means for removing the residual organic solvent from the fly ash, and dehydration means for dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and reducing the pressure, and dehydrating the organic solvent. A concentration means for concentrating by heating or / and reduced pressure, a reaction means for decomposing the organic chlorine compound by reacting the organic solvent in which the organic chlorine compound is concentrated with an alkali in a polar organic solvent for decomposing the organic chlorine compound, and a reaction means Condensing means for condensing and recovering the gaseous organic solvent and polar organic solvent generated in the above step, and circulating the reaction-terminated liquid from the reaction means to reuse the organic solvent for extraction, polar organic solvent and alkali And organic chlorine compounds in soil, solids and fly ash, characterized in that organic solvents for extraction, polar organic solvents and alkalis can be reused in the system. Management apparatus. 17. The extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and the reaction means comprises a slurry control. The apparatus for treating organic chlorine compounds in soil, solid matter, and fly ash according to claim 16, comprising a tank and a reaction tank. 18. A heat exchanger is provided in a pipe connecting the slurry adjusting tank and the reaction tank, and the adjusted slurry supplied to the reaction tank is heated by exchanging heat with the reaction solution after the decomposition reaction. An apparatus for treating organochlorine compounds in soil, solid matter and fly ash according to claim 17. 19. A part of the reaction-terminated liquid is withdrawn from the reaction means to remove and recover a used salt comprising a reaction product, such as chloride and alkali, from the organic solvent for extraction and the polar organic solvent, and to separate and extract the salt. 2. A salt recovery means for introducing an organic solvent for use and a polar organic solvent into a circulation means.
The apparatus for treating organic chlorine compounds in soil, solid matter, and fly ash according to 6, 17, or 18. 20. The apparatus for treating organic chlorine compounds in soil, solid matter, and fly ash according to claim 19, wherein the salt recovering means comprises a filter and a dryer. 21. A solid-liquid separation means for extracting a part of the reaction-completed liquid from the reaction means and performing solid-liquid separation to recover an organic solvent for extraction and a polar organic solvent on the liquid side; And the alkali contained in the residual organic solvent and the chloride as a reaction product are separated by the difference in solubility in alcohol, and the chloride and alkali are separated by heat drying or / and decompression to separate the alcohol, respectively. 19. The apparatus for treating organic chlorine compounds in soil, solid matter, and fly ash according to claim 16, further comprising a separation / recovery means for circulating and using the recovered alkali. 22. The treatment of organochlorine compounds in soil, solid matter and fly ash according to claim 21, wherein the solid-liquid separation means comprises a filter, and the separation / recovery means comprises a dissolution tank, a filter and a dryer. apparatus. 23. Fly ash discharged from soil, solid matter and / or waste treatment equipment contaminated with an organochlorine compound is mixed with an organic solvent for extracting an organochlorine compound to extract the organochlorine compound into the organic solvent. And solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound, and drying and / or depressurizing the separated soil, solids or / and fly ash Depending on the soil, solid matter or /
Separation means for removing the residual organic solvent from the fly ash, and dehydration means for dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and reducing the pressure, and dehydrating the organic solvent. A soil / solid matter / fly ash characterized by comprising a concentration means for concentration by heating or / and reduced pressure, and a thermal decomposition treatment means for thermally decomposing an organic solvent in which an organic chlorine compound is concentrated by plasma. Equipment for organic chlorine compounds. 24. The extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifugal separator and a dryer, the dehydration means and the concentration means comprise a distillation column, and the pyrolysis treatment means. 24. A plasma generator, a reaction vessel, an inert gas tank, a neutralizer tank, and an oxidizer tank.
An apparatus for treating organochlorine compounds in soil, solid matter, and fly ash as described in the above. 25. Fly ash discharged from soil, solid or / and waste treatment equipment contaminated with an organochlorine compound is mixed with an organic solvent for extracting an organochlorine compound to extract the organochlorine compound into the organic solvent. And solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound, and drying and / or depressurizing the separated soil, solids or / and fly ash Depending on the soil, solid matter or /
Separation means for removing the residual organic solvent from the fly ash, and dehydration means for dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and reducing the pressure, and dehydrating the organic solvent. A concentration means for concentrating by heating or / and depressurization, and an organic solvent in which the organic chlorine compound is concentrated is passed through activated carbon to adsorb and remove the organic chlorine compound, and the used activated carbon is heated to thermally decompose the adsorbed organic chlorine compound. A soil characterized by comprising adsorption / pyrolysis means.
Equipment for treating organic chlorine compounds in solids and fly ash. 26. The extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifuge and a dryer, the dehydration means and the concentration means comprise a distillation column,
26. The apparatus for treating organic chlorine compounds in soil, solid matter, and fly ash according to claim 25, wherein the thermal decomposition means comprises an activated carbon adsorption tower and a heating reactor. 27. Fly ash discharged from an apparatus for treating soil, solid matter and / or waste contaminated with an organic chlorine compound is mixed with an organic solvent for extracting an organic chlorine compound to extract the organic chlorine compound into the organic solvent. And solid-liquid separation of soil, solids or / and fly ash and an organic solvent containing an organochlorine compound, and drying and / or depressurizing the separated soil, solids or / and fly ash Depending on the soil, solid matter or /
Separation means for removing the residual organic solvent from the fly ash, and dehydration means for dehydrating the organic solvent after the extraction of the organic chlorine compound obtained by solid-liquid separation by heating or / and reducing the pressure, and dehydrating the organic solvent. It is characterized by comprising a concentration means for concentration by heating or / and reduced pressure, and a pyrolysis means for directly pyrolyzing the organic chlorine compound by passing an organic solvent in which the organic chlorine compound is concentrated through heated activated carbon. Equipment for treating organic chlorine compounds in soil, solids and fly ash. 28. The extraction means comprises a stirring and mixing tank and a washing tank, the separation means comprises a filter or a centrifuge and a dryer, the dehydration means and the concentration means comprise a distillation column, and the pyrolysis means comprises activated carbon. 28. The soil according to claim 27, comprising a reaction vessel.
Equipment for treating organic chlorine compounds in solids and fly ash. 29. A heat exchanger provided before the dehydrating means, wherein the organic solvent introduced into the dehydrating means is heated by exchanging heat with the distilled organic solvent from the concentrating means.
8. The apparatus for treating organochlorine compounds in soil, solid matter, and fly ash according to any one of 8 above.