JP2009201690A - Treating method of treatment residue including contaminant, and container used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treating method of treatment residue including contaminants, efficiently treating the treatment residue of treating contaminated soil for instance, a container used for the same, a treating method of the contaminated soil or waste liquid and a hydrothermal oxidation decomposition method of the treatment residue. <P>SOLUTION: There provided are: the container 12 for storing soil treatment liquid 11 with which the contaminated soil is treated; a supply line 14 for supplying a dissolving liquid 13 for dissolving the soil treatment liquid 11 into the container from the upper part of the container 12; an agitation means 15 comprising an agitation rod 15a and an agitation blade 15b for agitating the dissolving liquid 13 supplied into the container 12 and the soil treatment liquid 11; gas lines 16-1 and 16-2 connected with a gas circulation line 21 circulating a gas inside the container 12; and a discharge line 17 connected with a liquid discharge line 21 for discharging dissolved liquid mixture after dissolving the soil treatment liquid 11. The dissolving liquid 13 is sprayed and the soil treatment liquid 11 is dissolved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for treating a treatment residue containing a pollutant that can efficiently treat a treatment residue such as a soil treatment solution containing a pollutant that has been treated with the contaminated soil, a container used therefor, treatment of contaminated soil or waste liquid, and the like. The present invention relates to a method and a hydrothermal oxidative decomposition method of treatment residue.

  In recent years, there has been an increase in soil and groundwater contaminated with chemical substances that cannot be naturally decomposed due to soil contamination due to immersion of domestic wastewater, wastewater from factories, offices, etc., and soil contamination of factory sites. As a result, it has a serious impact on the soil environment as an ecosystem and social infrastructure. Therefore, various methods for purifying such contaminated soil and groundwater have been proposed. However, there are no effective treatment methods for waste oil, PCBs, dioxins, etc. remaining in the soil, and current countermeasures such as incineration and containment are being implemented.

  Conventionally incinerated, soil contaminated with various harmful substances such as oil, PCB and dioxin is incinerated in a high temperature atmosphere with an incinerator such as a rotary kiln and is contained in contaminated soil. It incinerates and decomposes various harmful substances and returns them to the environment as purified soil. In addition, gases emitted from the decomposition of various harmful substances in this incineration facility are rendered harmless and are released into the atmosphere as exhaust gas together with combustion gases.

  However, for such a large-scale incineration facility, the energy cost is high for treating a huge amount of contaminated soil, and there is a possibility that waste will be handled due to alteration of the soil after treatment, May be difficult to reuse. On the other hand, the contaminated soil containment process described above is not essentially a measure for purifying the contaminated soil, but is merely a passive treatment method of blocking from the natural world. Therefore, an economically advantageous soil treatment method for properly purifying soil contaminated with various harmful substances such as oil, PCB and dioxin and returning it to the natural world is desired.

  Therefore, various methods for directly purifying and cleaning with organic solvents by adding metal catalysts and auxiliaries to the soil have been proposed as methods for purifying contaminated soil (Patent Documents 1 and 2). In particular, solvent cleaning can simultaneously purify residual organic contaminants and inorganic substances (such as heavy metals) by using a water-soluble organic solvent (Patent Document 2).

Here, an example of soil treatment is shown in FIG.
As shown in FIG. 8, a conventional soil treatment system 200 extracts contaminated soil 201 from a contaminated soil purification device 202 by using a treatment solvent 203 to extract treated contaminants 205, and uses the extracted solvent 204 as a purification device 206. The recovered solvent 207 that has been purified by the above process is used again as the processing solvent 203 in the contaminated soil purification apparatus 202.
The soil treatment liquid 208 in which the contaminants remain is hydrothermally oxidized and decomposed by the hydrothermal oxidative decomposition apparatus 209 in a high-temperature and high-pressure subcritical state to render it harmless. As the hydrothermal oxidative decomposition apparatus 209, contaminants (for example, PCB) are subjected to sodium chloride by oxidative decomposition reaction in the presence of an alkaline agent (for example, sodium carbonate (Na ₂ CO ₃ )) in a heated and pressurized reactor. Examples thereof include an apparatus for detoxifying by decomposing into (NaCl), carbon dioxide (CO ₂ ) and the like.

JP 2007-209825 A JP 2003-220381 A

  However, when decontaminating organic substances and inorganic substances at the same time with the washing liquid and extraction residue, the treatment residue of the contaminated soil washing is derived from the soil as shown in the infrared spectrum analysis spectrum of the treatment residue of the contaminated soil shown in FIG. The sludge component, polycyclic aromatic hydrocarbon and heavy tar component are contained in a large amount, and the viscosity thereof is increased, so that it is easy to solidify, and as a result, the handling operation is very difficult.

  For example, when analyzing a soil treatment solution, the moisture content is 30% by weight, the ash content is 10% by weight, the density is 1 or less, and the inorganic element components include, for example, Ca, S, Si, Cl, Na, Mg, Fe, K, etc. Has been.

  As a result, storage tanks and piping may become clogged due to solidification, making it difficult to continuously supply the contaminated soil cleaning solution directly to the cracking device (eg hydrothermal oxidative cracking device), making it harmless continuously. There is a problem that processing cannot be realized.

  Therefore, liquefaction by preheating the soil treatment liquid is effective, but because the viscosity is high, the heating temperature is high and the operation is complicated, and the preheating equipment and the utilities that accompany it are also large. There is a problem of becoming high.

  In addition to soil treatment, waste liquid (waste water, waste oil, etc.) treatment of residual pollutants, efficient treatment method of treatment residue including tar components and sludge components in the reaction tower of hydrothermal oxidative decomposition equipment Establishment is anxious.

  In view of the above problems, the present invention provides a method for treating a treatment residue containing a contaminant, such as a soil treatment solution containing a contaminant treated with contaminated soil, and a container used for the treatment method. It is an object of the present invention to provide a method for treating soil or waste liquid and a method for hydrothermal oxidation decomposition of treatment residues.

  In the first invention of the present invention for solving the above-mentioned problems, a processing residue containing a contaminant treated with a harmful contaminant is stored in a container, and then dichlorobenzene is added and dissolved in the container. There is a method for treating a treatment residue containing a pollutant, characterized in that the melt mixture is supplied to a hydrothermal oxidative decomposition apparatus and the melt mixture containing the pollutant is hydrothermally oxidized and decomposed.

  According to a second aspect of the present invention, there is provided a method for treating a treatment residue containing a pollutant, characterized in that perchloroethylene is added to dichlorobenzene as a solution in the first aspect of the invention.

  3rd invention WHEREIN: In 1st or 2nd invention, a container combines a storage container, a conveyance container, and a dissolution container to a hydrothermal oxidative decomposition apparatus, and in a melt | dissolution process, dichlorobenzene and perchloroethylene are used. A processing residue treatment method including a pollutant is characterized in that a treatment residue containing a contaminant is dissolved (liquefied at room temperature) while spraying a mixed solution.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, there is provided a method for treating a treatment residue containing a pollutant, characterized by gas stirring in the dissolving step.

  According to a fifth invention, in any one of the second to fourth inventions, when the viscosity of the treatment residue is high, dichlorobenzene is introduced first to dissolve the treatment residue containing the contaminant, and then the perchlorethylene is added. The processing residue treatment method including a pollutant is characterized in that the treatment residue is dissolved in the mixed solution while being mixed and liquid / liquid agitation due to the difference in specific gravity.

  According to a sixth invention, in any one of the first to fifth inventions, dimethyl sulfoxide is supplied from the bottom side of the container, and the contaminant contained in the solution is extracted. It is in the processing method.

  7th invention stores the processing residue containing the pollutant which processed the pollutant in a storage container, after that, pollutants are gasified by vacuum heat processing, the pollutant in gas is processed with an oil scrubber, A waste scrubber liquid is supplied to a hydrothermal oxidative decomposition apparatus, and a waste scrubber liquid containing a pollutant is hydrothermally oxidized and decomposed.

  According to an eighth aspect of the present invention, in the seventh aspect of the invention, there is provided a processing residue processing method including a contaminant, wherein the heating temperature of vacuum heating is 150 to 250 ° C. and the pressure is 10 Pa to 1 KPa.

  A ninth invention provides a method for treating a treatment residue containing a pollutant, characterized in that, in any one of the first to eighth inventions, the pollutant contained in the treatment residue is a persistent organic pollutant or waste oil. is there.

  According to a tenth aspect of the present invention, in any one of the first to ninth aspects, a pollutant is characterized in that the treatment residue is either a contaminated soil or a treatment liquid of contaminated waste liquid, or a hydrothermal oxidative decomposition reaction treatment residue. It is in the processing method of the processing residue containing.

  In an eleventh aspect of the invention, in any one of the first to tenth aspects, the hydrothermal oxidative decomposition apparatus harms pollutants by oxidative decomposition reaction in the presence of an alkaline agent in a heated and pressurized reactor. The present invention resides in a processing method for a processing residue containing a pollutant, characterized in that the processing is performed.

  The twelfth invention is used in the invention of any one of the first to eleventh processing residue processing methods, and a container for storing the processing residue after processing the contaminants, and the processing residue in the container from above the container. A supply line for supplying a solution for dissolving the solvent, a stirring means for stirring the solution and the soil treatment liquid supplied in the container, a gas circulation line for circulating the gas in the container, and a dissolution mixture after dissolving the processing residue A processing container for processing residues containing contaminants, comprising a liquid extraction line for extracting liquid.

  According to a thirteenth aspect of the invention, in the twelfth aspect of the invention, there is provided a treatment residue treatment container containing a pollutant, wherein the solution is dichlorobenzene or a mixed solution of dichlorobenzene and perchloroethylene.

  According to a fourteenth aspect of the present invention, in the thirteenth aspect of the present invention, there is provided a processing container for processing residues containing contaminants, characterized in that a supply line for supplying dimethyl sulfoxide from the bottom side of the container is provided.

  A fifteenth aspect of the invention is a method for treating a soil treatment liquid according to any one of the first to eleventh aspects, wherein a container for storing a treatment residue obtained by treating a contaminant and a soil treatment liquid inside the container are heated in a vacuum. Vacuum scrubbing means, an oil scrubber that removes pollutants in the gas generated by vacuum heating, and a waste scrubber liquid extraction line that discharges waste scrubber liquid containing pollutants treated by the oil scrubber to the hydrothermal oxidative decomposition apparatus And a processing container for processing residues containing contaminants.

  A sixteenth aspect of the present invention provides a contaminated soil or waste liquid treatment step for removing contaminants in the contaminated soil or waste liquid with a solvent, and a treatment residue containing the contaminant obtained in the contaminated soil or waste liquid treatment step. 11. A method for treating contaminated soil or waste liquid, comprising a treatment step for treating residue treated by any one of the treatment methods for treating residue.

  According to a seventeenth aspect of the present invention, there is provided a contaminated soil or waste liquid treatment step for removing a contaminant in the contaminated soil or waste liquid with a solvent, and a treatment residue containing the contaminant obtained in the contaminated soil or waste liquid treatment step. 11. A process residue hydrothermal oxidative decomposition method comprising a process residue process step of processing by any one of the process residue process methods.

  According to the present invention, soil treatment liquid, waste liquid containing residual contaminants (waste water, waste oil, etc.) treatment, and treatment residue containing tar components and sludge components in the reaction tower of the hydrothermal oxidative decomposition apparatus are dissolved. Therefore, efficient processing can be performed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

An embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a treatment residue treatment container used in the soil treatment liquid treatment method according to the present embodiment.
Hereinafter, in a present Example, it demonstrates using a soil processing liquid as a process residue.
As shown in FIG. 1, a dissolution apparatus 10 that is a processing container for processing residues according to this embodiment includes a container 12 that stores a soil processing solution 11 that has processed contaminated soil, and a container 12 that is disposed above the container 12. A supply line 14 for supplying a solution 13 for dissolving the soil treatment solution 11, a stirring means 15 comprising a solution 13 supplied into the container 12, a stirring rod 15a for stirring the soil treatment solution 11, and a stirring blade 15b; The gas lines 16-1 and 16-2 connected to the gas circulation line 21 that circulates the gas in the container 12, the liquid extraction line 21 for extracting the dissolved mixed solution after dissolution of the soil treatment liquid 11, and the like are connected. And a line 17. In the figure, reference numeral 22 is a viscometer, 23 is a level meter, 24 is an interface meter, 33 is a filter, A _{1 to} A ₄ are connecting parts connected to various lines, and V _{1 to} V ₄ are valves. .

Here, as a solution of the soil treatment liquid 11, it is preferable to use dichlorobenzene alone or a mixed liquid obtained by adding perchloroethylene to dichlorobenzene.
In particular, the mixing ratio is preferably 1: 1 to 1:10.

  In addition, the specific gravity of dichlorobenzene is 1.31, whereas the specific gravity of perchlorethylene is as heavy as 1.62. First, it is preferable to add dichlorobenzene to dissolve the soil treatment liquid containing the pollutant, and then to add perchloroethylene, and to mix while stirring the liquid and liquid due to the specific gravity difference.

  FIG. 1 shows a storage container for storing a soil treatment liquid obtained by purifying soil with a contaminated soil purification apparatus as described in the prior art, a transport container for transporting to a hydrothermal oxidative decomposition apparatus, and a liquid in the hydrothermal oxidative decomposition apparatus. It also serves as a dissolution container that is dissolved when supplied.

FIG. 2 is an explanatory diagram for dissolving the soil treatment solution using the solution.
As shown in FIG. 2, in a dissolution facility (described later) in the vicinity of the hydrothermal oxidative decomposition apparatus, a solution supply line 31 for supplying the solution 13 and a supply line 14 are connected by a connecting portion A ₁ , and the container 12 is connected. The solution 13 is sprayed on the soil treatment liquid 11 as a spray liquid 34 through a filter 33 disposed inside.

In addition, the gas circulation line 21 and the gas lines 16-1 and 16-2 are connected by connecting portions A ₂ and A ₃ , and the stirring gas 35 is circulated by the blower 36. As the stirring gas 35, the gas inside the container may be simply circulated, but air may be separately supplied, or further, the gas 37 generated in the hydrothermal oxidative decomposition apparatus may be supplied. May be.

  Thereby, in the process of melt | dissolving the soil treatment liquid 11, the soil treatment liquid 11 containing a contaminant can be dissolved and sprayed at normal temperature, spraying the solution 13 which mixed dichlorobenzene and perchloroethylene.

Next, the step of dissolving using the dissolving solution 13 will be described in detail.
A solution 13 of dichlorobenzene and perchlorethylene (mixing ratio 1: 1) 13 is atomized and supplied from the upper part in the container 12 having the stirring means 15 through the 0.1 mm filter 33.

Since the viscosity differs from the concentration of tar or the like, dichlorobenzene and perchloroethylene are adjusted at an arbitrary ratio and controlled by the viscometer 22, the level meter 23, and the interface meter 24.
In the dissolution, liquid-liquid contact is forcibly performed using the stirring blade 15 b of the stirring means 15 and the stirring gas 35.

  Since the liquefied dissolved mixed solution 38 can be mixed with, for example, PCB or oil to be decomposed by the hydrothermal oxidative decomposition apparatus 39, it is supplied as it is to the hydrothermal oxidative decomposition apparatus 39, which is a detoxification processing apparatus, via the liquid feed pump 40. be able to.

Thereby, the viscosity of the soil treatment liquid 11 that is a treatment residue obtained by treating the contaminated soil is reduced, and handling when the treatment is performed by the hydrothermal oxidative decomposition apparatus 39 is facilitated.
FIGS. 3-1 and 3-2 show the relationship between the amount of dichlorobenzene added and the viscosity of the soil treatment solution for contaminated soil. Here, FIG. 3-1 shows a case where the shearing speed increases and FIG. 3-2 shows a case where the shearing speed decreases. Since the apparent viscosity of the liquid mixture that can be conveyed is 400 cP at a shear rate of 100 (1 / s), the solution may be added so that the viscometer 22 always has a viscosity of 400 cP or less.

Thus, according to the present Example, the contaminated soil processing liquid 11 can be liquefied with dichlorobenzene alone or a mixed liquid of dichlorobenzene and perchlorethylene.
In addition, organic solvents other than these, such as acetone, toluene, hexane, ethanol, isopropyl alcohol (IPA), aliphatic hydrocarbon solvents, kerosene, etc., treat the processing residue containing tar components and sludge components treated with contaminants at room temperature. It was difficult to liquefy.

Thus, according to the present invention, the treatment residue such as soil treatment liquid can be made a fluid that can be handled at room temperature, and further, heat energy such as heating is unnecessary and cooling is not necessary. Cost can also be reduced.
Furthermore, in the hydrothermal oxidative decomposition apparatus, for example, it can be decomposed simultaneously or separately with other harmful contaminants (liquid) such as PCB.

Moreover, you may make it add an additive to the said solution.
Here, when the main solvent of the soil treatment liquid 11 is high in hydrophilicity such as acetone, a nonionic surfactant having a large HLB value is used in order to perform dispersion in an oil-in-water (O / W) type. It is preferable. As an example, for example, polyoxyethylene lauryl ether (C ₁₂ H ₂₅ (C ₂ H ₄ O) ₂ OH, HLB value: 15.3; aliphatic surfactant), polyoxyethylene octyl phenyl ether (HLB value: 14.5; aromatic surfactant) may be used.

In addition, when the main solvent of the soil treatment liquid 11 is high in lipophilicity such as toluene, a nonionic surfactant having a small HLB value is used in order to perform dispersion by a water-in-oil (S / O) type. Can do. As an example, new oil type glyceryl monostearate (CH ₂ OCOR (CHOH) (CH ₂ OH), HLB value 2.8), new oil type glycerin monooleate (CH ₂ OCOR (CHOH) (CHOH), HLB The value 2.8) should be used.

Furthermore, when the composition of the soil treatment liquid 11 cannot be determined, it is preferable to use an amphoteric surfactant. Such as lauryl betaine ^{_{(R1R 2 R 3 -N + (}} CH 2) nCOO -) preferably used.

  In addition, it is preferable to optimize the ratio which adds an additive by making the apparent viscosity by a viscometer into 400 cP or less as a parameter | index similarly to having mentioned above.

FIG. 4 illustrates a contaminated soil treatment process using a hydrothermal oxidative decomposition apparatus.
As shown in FIG. 4, the contaminated soil treatment process includes a contaminated soil treatment process (S11) for removing contaminants in the contaminated soil 101 with a solvent, and a soil treatment liquid in the container of the dissolving apparatus 10 shown in FIG. Step (S12) for storing and storing / conveying and soil treatment liquid 11 stored in the dissolution apparatus 10 is supplied with the dissolution liquid 13 and processed by the dissolution apparatus 10 as shown in FIG. It consists of a liquid dissolving step (S13) and a hydrothermal oxidative decomposition step (S14) in which the dissolved mixed solution 38 is decomposed by the hydrothermal oxidative decomposition apparatus 39, and the soil treatment liquid can be rendered harmless.

Next, FIG. 5 shows an example of a hazardous substance processing system in which soil treatment equipment and hydrothermal oxidative decomposition equipment are integrated.
The toxic substance treatment system includes a soil treatment facility 100, a dissolution treatment facility 110, and a hydrothermal oxidative decomposition apparatus 120.
First, the soil treatment facility 100 includes a soil treatment device 104 that treats the contaminated soil 101 with the treatment solvent 102 to render the treated soil 103 harmless. The soil treatment solution 11 treated by the soil treatment device 104 is stored in the container 12. To store or transport. Next, the dissolution treatment facility 110 performs the dissolution treatment as shown in FIG. 2, and hydrothermal oxidative decomposition is performed by the hydrothermal oxidative decomposition apparatus 120 as a dissolved mixed solution 38 that is liquid at room temperature.

The schematic configuration of the hydrothermal oxidative decomposition apparatus 120 in the present embodiment is as follows. The dissolved mixed solution 38, an object 121 such as PCB separately separated, oil 122, sodium hydroxide (NaOH) 123, pure water 124 and oxygen ( A cylindrical primary reaction column 126 into which O ₂ ) is introduced from a high-pressure oxygen supply facility 125, a secondary reaction column 127, a cooler 128, and a pressure reducing valve 129 for the reactor are provided. Further, a gas-liquid separation device 132 that separates waste water (H ₂ O, NaCl) 130 and exhaust gas (CO ₂ ) 131 is disposed downstream of the pressure reducing valve 129. The secondary reaction column 127 can be omitted if necessary.

In the above apparatus, the pressure in the primary reaction column 126 is increased to, for example, 26 MPa by pressurization by the pressurization pumps 135a to 135d. The heat exchanger 136 preheats the pure water 123 to about 300 ° C. Further, oxygen is spouted into the primary reaction tower 126, and the temperature is raised to 350 ° C. to 400 ° C. (preferably up to 370 ° C.) by the internal reaction heat. By this stage, an oxidative decomposition reaction has occurred in the primary reaction column 126, and harmful substances such as PCB contained in the object 121 have been decomposed into CO ₂ and H ₂ O. Next, in the cooler 128, the fluid from the secondary reaction tower 127 is cooled to about 100 ° C., and the pressure is reduced to atmospheric pressure by the pressure reducing valve 129 at the subsequent stage. Then, CO ₂ and water vapor and the treatment liquid are separated by the gas-liquid separator 132, and the CO ₂ and water vapor are discharged into the environment through the activated carbon layer 137 through the chimney 138. Further, the waste water 130 is temporarily stored in the discharge tank 139 and then discharged.

  As described above, the dissolution apparatus 10 shown in FIG. 1 can cover all the steps of storing, storing, transporting and dissolving the soil treatment liquid 11, making it easy to handle the container and moving from the container to the container. Such secondary contamination can also be prevented.

  In the present embodiment, the soil treatment liquid has been exemplified and described as a treatment residue. However, the present invention is not limited to this, and for example, a residual liquid (PCB, dioxins, etc.) containing waste liquid (waste water, waste oil, etc.) ) Efficient treatment can be performed by dissolving the treatment residue containing tar components and sludge components in the reaction tower of the treatment and hydrothermal oxidative decomposition apparatus.

FIG. 6 is a schematic view of a dissolution apparatus used in the soil treatment liquid treatment method according to the present embodiment.
Hereinafter, in a present Example, it demonstrates using a soil processing liquid as a process residue.
The dissolution apparatus according to this example is the same as the apparatus of Example 1, except that a supply line 41 for dimethyl sulfoxide is provided on the lower side of the container 12. Then, dimethyl sulfoxide is supplied from the bottom side of the container 12 to extract the contaminant contained in the solution.

  In this manner, dimethyl sulfoxide is introduced from the lower part of the container 12, and extraction is performed by contact between dichlorobenzene and liquid / liquid. After this extraction, the mixed liquid in the lower part of the container separated into two layers is extracted and removed from the contaminants, so it is sent to an external waste line, and then the dimethyl sulfoxide extract 42 is installed in the hydrothermal oxidative decomposition apparatus 39 equipment. To hydrothermal oxidative decomposition.

FIG. 7 is a schematic diagram of a treatment residue treatment container used in the soil treatment liquid treatment method according to the present embodiment.
Hereinafter, in a present Example, it demonstrates using a soil processing liquid as a process residue.
A vacuum heating apparatus 50, which is a processing container for processing residues according to the present embodiment, is provided with an external heater 51, evacuated by a vacuum pump 53, gasified with the soil treatment liquid 11 by vacuum heating, and in the generated gas. An oil scrubber device 52 that removes contaminants (PCB), a waste scrubber liquid extraction line 57 that discharges the waste scrubber fluid 56 containing the contaminants (PCB) treated by the oil scrubber device 52 to the hydrothermal oxidative decomposition device 39, and It comprises.

  The conditions for the vacuum heat treatment are vacuum heating at a heating temperature of 150 to 250 ° C. and a pressure of 10 Pa to 1 KPa, and the vaporized contaminants are collected in the oil scrubber 52 using the scrubber liquid 54. The scrubber liquid 54 is circulated by a circulation pump 55 and, when discarded, is supplied as is to the hydrothermal oxidative decomposition apparatus 39 as a waste scrubber liquid 56.

  The sludge after heating is liquefied at room temperature by a procedure as shown in FIG. 2, and is discharged to the outside as waste.

  As described above, according to the present invention, not only soil treatment but also waste liquid (waste water, waste oil, etc.) treatment containing residual pollutants, and tar components and sludge components in the reaction tower of the hydrothermal oxidative decomposition apparatus are included. It can be applied to an efficient processing method for processing residues.

It is the schematic of the processing container of the processing residue used with the processing method of the soil processing liquid which concerns on Example 1. FIG. It is the schematic of the melt | dissolution process. It is a relationship diagram (increase in shear rate) between the added amount of dichlorobenzene and the apparent viscosity. FIG. 4 is a diagram (shear rate drop) between the amount of dichlorobenzene added and the apparent viscosity. It is a flowchart of the processing process of contaminated soil. It is the schematic of the hazardous | toxic substance processing system which combined the contaminated soil process and the hydrothermal oxidative decomposition process. It is the schematic of the melt | dissolution apparatus used with the processing method of the soil processing liquid which concerns on Example 2. FIG. It is the schematic of the processing container of the processing residue used with the processing method of the soil processing liquid which concerns on Example 3. FIG. It is the schematic of the conventional soil treatment. It is a spectrum figure of the infrared spectroscopy analysis of the processing residue of contaminated soil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dissolution apparatus 11 Soil treatment liquid 12 Container 13 Dissolution liquid 14 Supply line 15 Stirring means 22 Viscometer

Claims (17)

Store processing residue containing contaminants that have been processed from harmful contaminants in containers,
Then, add dichlorobenzene into the container,
A method for treating a treatment residue containing a pollutant, which comprises supplying the dissolved solution mixture to a hydrothermal oxidative decomposition apparatus and hydrothermally oxidizing and dissolving the solution mixture containing the pollutant. In claim 1,
A method for treating a treatment residue containing a pollutant, wherein perchlorethylene is added to dichlorobenzene as a solution. In claim 1 or 2,
The container is a storage container up to the hydrothermal oxidative decomposition apparatus, a transport container, and a dissolution container.
A method for treating a treatment residue containing a pollutant, which comprises dissolving the treatment residue containing a pollutant while spraying a mixed liquid of dichlorobenzene and perchlorethylene in the dissolving step. In claim 2,
A method for treating a treatment residue containing a pollutant, characterized by gas stirring in a dissolution step. In any one of Claims 2 thru | or 4,
If the viscosity of the treatment residue is high, dichlorobenzene is introduced first to dissolve the treatment residue containing contaminants, then perchloroethylene is introduced, and the treatment residue is mixed into the mixture while stirring the liquid and liquid due to the specific gravity difference. A method for treating a treatment residue containing a pollutant, wherein In any one of Claims 1 thru | or 5,
A method for treating a processing residue containing a pollutant, characterized in that dimethyl sulfoxide is supplied from the bottom side of the container and the pollutant contained in the solution is extracted. Store the processing residue containing the contaminated material in the storage container.
After that, the pollutants are gasified by vacuum heat treatment, the pollutants in the gas are treated with an oil scrubber, the waste scrubber liquid is supplied to the hydrothermal oxidative decomposition equipment, and the waste scrubber liquid containing the pollutants is hydrothermally oxidized. A method for treating a treatment residue containing a pollutant characterized by decomposing. In claim 7,
The processing method of the processing residue containing the contaminant characterized by the heating temperature of vacuum heating being 150-250 degreeC, and a pressure being 10 Pa-1KPa. In any one of Claims 1 to 8,
A method for treating a processing residue containing a pollutant, wherein the pollutant contained in the processing residue is a persistent organic pollutant or waste oil. In any one of Claims 1 thru | or 9,
A method for treating a treatment residue containing a pollutant, wherein the treatment residue is any one of a contaminated soil, a treatment solution of a contaminated waste liquid, and a hydrothermal oxidative decomposition reaction treatment residue. In any one of Claims 1 thru | or 10,
The hydrothermal oxidative decomposition apparatus detoxifies the pollutant by oxidative decomposition reaction in the presence of an alkaline agent in a heated and pressurized reactor. Processing method. It is used with the processing method of the processing residue of any one of Claims 1 thru | or 11,
A container for storing the treatment residue treated with the contaminant;
A supply line for supplying a solution for dissolving the processing residue into the container from above the container;
A stirring means for stirring the solution and the soil treatment solution supplied in the container;
A gas circulation line for circulating the gas in the container;
A processing container for processing residues containing contaminants, comprising a liquid extraction line for extracting the dissolved mixed solution after dissolution of the processing residues. In claim 12,
A treatment container for a treatment residue containing a pollutant, wherein the solution is dichlorobenzene or a mixture of dichlorobenzene and perchloroethylene. In claim 13,
A processing container for processing residue containing contaminants, characterized by comprising a supply line for supplying dimethyl sulfoxide from the bottom side of the container. It is used with the processing method of the processing residue of any one of Claims 1 thru | or 11,
A container for storing the treatment residue treated with the contaminant;
Vacuum heating means for vacuum heating the soil treatment liquid inside the container;
An oil scrubber to remove pollutants in the gas generated by vacuum heating;
A waste scrubber liquid extraction line for discharging a waste scrubber liquid containing a contaminant treated with an oil scrubber to a hydrothermal oxidative decomposition apparatus. A contaminated soil or waste liquid treatment process for removing contaminants in the contaminated soil or waste liquid with a solvent;
The processing residue processing process which processes the processing residue containing the pollutant obtained by the said contaminated soil or a waste liquid processing process with the processing method of the processing residue of any one of Claim 1 thru | or 11 is included, It is characterized by the above-mentioned. Treatment method of contaminated soil or waste liquid. A contaminated soil or waste liquid treatment process for removing contaminants in the contaminated soil or waste liquid with a solvent;
The processing residue processing process which processes the processing residue containing the pollutant obtained by the said contaminated soil or a waste liquid processing process with the processing method of the processing residue of any one of Claim 1 thru | or 11 is included, It is characterized by the above-mentioned. Hydrothermal oxidative decomposition method of treatment residue.

Images