WO2003086673A1 - Method and device for removing harmful substances - Google Patents

Abstract

A method and a device for removing harmful substances capable of safely processing the harmful substances and improving a processing efficiency, the device comprising a harmful substance separating and extracting device (10) for storing contaminated solid matter together with solvent, a heating device (1a) for heating the inside of the harmful substance separating and extracting device (10), an enriching device (17) connected to the harmful substance separating and extracting device (10) and collecting vapor generated in the harmful substance separating and extracting device (10), a heating device (17a) for heating and enriching the stored matter in the enriching device (17), a sucking device (21) for sucking residue in the harmful substance separating and extracting device (10), a residue processing device (24) for storing the matter sucked by the sucking device (21), and a solvent tank (28) for collecting solvent separated from the residue processing device (24).

Description

 Description Hazardous substance removal method and equipment Technical field

 The present invention relates to a method for removing harmful substances for removing dioxins or heavy metals contained in contaminated solids such as incinerated ash of a waste incinerator, industrial waste oil, pesticide residues, contaminated soil, sludge, etc. And equipment. Background art

 Hazardous substances such as dioxins and heavy metals are often contained in the incineration ash of industrial waste incinerators, industrial waste oil, pesticide residue, contaminated soil, sludge, and other contaminated solids. Conventional techniques for removing such harmful substances are disclosed in Japanese Patent Application Laid-Open No. 2000-79377, Japanese Patent Application Laid-Open No. 2000-159796 and Japanese Patent Application Laid-Open No. 0 0 0—1 6 7 5 3 1

 In other words, Japanese Patent Application Laid-Open No. 2000-79937 discloses that dioxins are extracted from contaminated solids in an organic solvent layer, heavy metals are extracted in an aqueous layer, and dioxins in an organic solvent layer are concentrated. A technique is disclosed in which the organic solvent and water used in the extraction are reused for the extraction by removing the heavy metals in the aqueous layer by filtration, and decomposing by electrolysis.

 Japanese Unexamined Patent Publication No. 2000-1505794 discloses that contaminated soil is disintegrated, heavy metals and cyanide are extracted by adding water and water, and the soil is purified by solid-liquid separation. A technique for performing this is disclosed.

Japanese Patent Application Laid-Open No. 2000-167531 discloses a technique of extracting dioxins from contaminated soil with an organic solvent and purifying the soil by solid-liquid separation. However, according to the conventional technology for removing harmful substances, purified soil and the like remain in the extraction device, and thus the treated soil and the like must be removed from the extraction device. At this time, dioxins and heavy metals may remain slightly inside the extraction device, and there was a problem that opening the extraction device involved a risk of exposure to harmful substances.

 In the extraction process, heat treatment is performed during the extraction of harmful substances.However, in the conventional technology, when the extraction device is opened and soil is removed from the extraction device, the solvent vapor inside the extraction device leaks out. The soil must be removed after the temperature inside the extraction device has dropped sufficiently to prevent it. For this reason, in the conventional technology, it was necessary to wait for the temperature in the extraction device to drop, and there was a problem that the processing efficiency was poor.

 The present invention has been made in view of such conventional problems, and provides a method and apparatus for removing harmful substances, which can safely treat harmful substances and improve the treatment efficiency. With the goal. Disclosure of the invention

 In order to achieve the above object, the method for removing harmful substances according to the present invention according to claim 1, further comprising: an extraction step of extracting harmful substances from contaminated solids with a solvent in an extraction device; and extracting the harmful substances from the solid-liquid mixture after the extraction step. An extract separation step of separating a harmful substance extract into a concentrator; a suction step of sucking a residue after the extract separation from the extractor to a residue processing device; and A concentration step of concentrating the harmful substance extract separated in the concentration apparatus; and a solvent recycling step of sending the solvent separated in the concentration step into the extraction apparatus.

The harmful substance removing method according to the present invention according to claim 2 is the method according to claim 1, wherein the solvent is separated from the residue sucked by the residue processing apparatus in the suction step. A solvent separation step, and a recovered solvent reuse step of sending the solvent separated in the solvent separation step into the extraction device.

 The method for removing harmful substances according to the present invention according to claim 3 includes an extraction step in which dioxins are extracted from dioxin-contaminated solids with an organic solvent in an extraction device, and a dioxin extraction from a solid-liquid mixture after the extraction step. A dioxins separation step of separating the liquid into a concentrator, a suction step of sucking the residue after the dioxins separation step from the extraction device to a residue processing device, and a dioxins separation step. A concentration step of concentrating the dioxin extract separated in the inside; and an organic solvent recycling step of sending the organic solvent separated in the concentration step into the extraction device.

The method for removing harmful substances according to the present invention according to claim 4, comprising: an extraction step of extracting dioxins and heavy metals from dioxin-contaminated solids with an organic solvent and water in an extraction device; and A dioxin separation step of separating the dioxin extract from the solid-liquid mixture into a concentrator, a heavy metal separation step of separating the heavy metal extract from the solid-liquid mixture after the extraction step into a heavy metal tank, A dioxins concentration step of concentrating the dioxins extract separated in the concentrator by the dioxins separation step, and a residue after the dioxins separation step and the heavy metals separation step from the extraction apparatus. A suction step of sucking into a processing apparatus; and a heavy metal for concentrating the heavy metal extract separated in the heavy metal tank by the heavy metal separation step. An organic solvent reuse step of sending the organic solvent separated in the dioxin concentration step to the extraction device; and a water reuse step of sending the water separated in the heavy metal concentration step to the extraction device. And characterized in that: The method for removing harmful substances according to the present invention according to claim 5 is the method according to claim 3 or 4, further comprising a decomposition step of decomposing dioxins contained in the dioxin extract concentrated in the concentration step. And The method for removing harmful substances according to the present invention according to claim 6, comprising: an extraction step of extracting heavy metals from heavy metal-contaminated solids with water in an extraction device; and a heavy metal extraction liquid from the solid-liquid mixture after the extraction step. A heavy metal separation step of separating into the heavy metal tank; a suction step of sucking the residue after the heavy metal separation step from the inside of the extraction device to a residue processing device; And a water recycling step of feeding the water separated in the heavy metal concentration step into the extraction device.

 The harmful substance removing method according to the present invention according to claim 7 is the method according to claim 4 or 6, wherein the water used in the extraction step is acidic water. The method for removing harmful substances according to the present invention according to claim 8 is the method according to claim 4 or 6, wherein water used in the extraction step is water. The harmful substance removing method according to the present invention according to claim 9 is the method according to claim 1, 2, 3, 4, 5, 6, 7, or 8, wherein the contaminating solids are crushed before the extraction step. It is characterized by having.

 In the pulverization step, it is preferable to pulverize the contaminated solid to a particle size of 1 to 2 mm from the viewpoint of the extraction efficiency of dioxins or heavy metals.

 According to a tenth aspect of the present invention, there is provided the method for removing a harmful substance according to the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth aspect, wherein contaminated solid matter is dried before the extraction step. It has a drying step.

The harmful substance removing device according to the present invention according to claim 11, comprising: a sealable extraction device for storing a contaminated solid matter together with a solvent; and a stirrer for stirring the content inside the extraction device. An extraction heating device for heating the interior of the extraction device; a sealing device connected to the extraction device, and a sealable concentration device for recovering steam generated inside the extraction device; A concentration heating device for heating and concentrating the contents, and steam generated from the concentration device A steam supply path for sending the suction device to the extraction device, a suction device for suctioning a residue inside the extraction device, a sealable residue treatment device for accommodating a suctioned material by the suction device, A drying heating device for heating and drying the contents of the residue processing device, a solvent tank for storing a solvent separated from the residue processing device, and a solvent in the solvent tank. And a solvent supply path for sending to the extraction device.

 The harmful substance removing device according to the present invention according to claim 12 is the device according to claim 11, wherein a dryer for drying contaminated solid matter, and the extracting device for crushing the dried matter by the dryer. And a crusher for sending the crusher to a crusher. The dryer can be constituted by, for example, a stirrer for stirring the contents and a tank provided with a heating device for heating the contents. The pulverizer can be constituted by, for example, a centrifuge.

 ADVANTAGE OF THE INVENTION According to the method and apparatus for removing harmful substances according to the present invention, it is possible to aspirate dioxins and heavy metals from the extractor after the liquid separation step, and to store the dioxins and heavy metals in the residue processing apparatus. There is no need to open the extraction device to remove the later solids. Therefore, even if dioxins and heavy metals remain inside the extraction device, there is no risk of exposure to harmful substances, and the purified solid can be handled safely.

 Further, according to the method and apparatus for removing harmful substances according to the present invention, it is not necessary to open the extraction device to take out the solid matter after the treatment, so that the extraction is performed by heat treatment when extracting the harmful substances in the extraction step. Even if the temperature inside the apparatus is high, the purified solid can be taken out from the residue processing apparatus, and the processing efficiency can be improved.

Examples of the contaminated solid matter that can be treated by the method and apparatus for removing harmful substances according to the present invention include, for example, incinerated ash, fly ash, agricultural chemical residue, and soil generated by incinerating waste such as garbage and sewage sludge. , Sludge and the like. The solvent may be any of an organic solvent, water, and a mixed solvent of an organic solvent and water. The solvent tank may be a tank containing only the organic solvent, only water, the organic solvent and water, and only one of the solvent tank containing the organic solvent and the solvent tank containing water is provided. Both may be provided. It is preferable to select a solvent for extracting harmful substances according to the type of harmful substances to be treated. Examples of the organic solvent for extracting dioxins include aromatic hydrocarbons, aliphatic hydrocarbons, alcohols, dialkyl ethers, esters, ketones, and the like.N-heptane, I-hexane, and cyclohexane One or two or more of mouth hexane, xylene, tonolene, benzene, diisopropylethyl ether, ethyl acetate, and ethyl methyl ketone are preferred. The solvent water is preferably composed of acidic water or alkaline water to facilitate extraction of heavy metals. As the acidic water, a general acid can be used, and for example, a hydrochloric acid aqueous solution, a sulfuric acid aqueous solution, a nitric acid aqueous solution, and the like can be used. As the alkaline water, a general alkaline agent can be used, and for example, an aqueous sodium hydroxide solution, an aqueous hydroxide water solution, or the like can be used. The pH of the acidic water used is preferably 1 to 3. The pH of the alkaline water used is preferably 9 to 11. '

5 volumes of organic solvent and hydrochloric acid for extraction. In the case of using a mixed solvent with a / ₀ aqueous solution, the mixing ratio between the organic solvent and the aqueous solution is preferably 3: 7 to 7: 3 by volume, and particularly preferably 1: 1.

As shown in Figs. 2 to 4, the extraction method is as follows: (1) Drying of contaminated solids, organic solvent extraction, acidic water extraction, alkaline water extraction, (2) drying of contaminated solids, organic solvent extraction , Alkaline water extraction, acidic water extraction, (3) organic solvent of contaminated solids-mixed solvent extraction with acidic water, organic solvent, alkaline water mixed solvent extraction, (4) organic solvent of contaminated solids · alkaline water Either of a mixed solvent extraction method and an organic solvent / acidic water mixed solvent extraction method can be used. If contaminated solids are dried, In this case, the drying step may be omitted as shown in FIG.

 In the extraction liquid separation step of separating the harmful substance extract from the solid-liquid mixture after the extraction step into a concentrator, a solid-liquid separation method such as solvent distillation, sedimentation separation, filtration or centrifugation can be used. The filtration method may be any of a pressure filtration method and a reduced pressure filtration method.

 It is preferable that the solvent contained in the residue treatment device be removed by drying. It is preferable that the exhaust gas by drying is discharged into the air after passing through an oil trap and a filter.

 The hazardous substance removing device according to the present invention may be installed in a predetermined facility or may be loaded on a trailer, a truck, or the like. Further, as the stirrer, a stirring blade type stirrer, a drum type stirrer, an ultrasonic generator or any other device having a stirring function may be used. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an overall configuration diagram showing a harmful substance removing device according to an embodiment of the present invention.

 FIG. 2 is a flow sheet showing a first example of the harmful substance removing method of the present invention.

 FIG. 3 is a flow sheet showing a second example of the harmful substance removing method of the present invention.

 FIG. 4 is a flow sheet showing a third example of the harmful substance removing method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is limited to the configuration such as the shape and arrangement of the devices described in the present embodiment. Instead, various embodiments are possible.

 The toxic substance removal device shown in Fig. 1 is a device for treating contaminated solids such as incinerated ash, fly ash, pesticide residues, soil, and sludge generated by incinerating municipal waste and sewage sludge. is there. The mixed powder frame device 1 is composed of a sealable container and has a heating device la and a stirrer lb. The heating device la functions as a dryer for drying the contaminated solid matter, and the stirrer lb functions as a crusher for crushing the dried matter. The mixing and crushing apparatus 1 is capable of inserting a movable suction nozzle 3 therein, and is connectable to the centrifuge 5 via the suction nozzle 3. The mixing and grinding device 1 is connected to an oil trap 2 via an exhaust path 2a, and further connected to a vacuum pump 3 and a finoletter 4. In addition, in order to transport the crushed contaminated solids from the mixing and crushing apparatus 1 to the centrifugal separator 5, a conveyor or other transporting device or transporting method can be used instead of the suction nozzle 3.

 The centrifuge 5 is connected to a harmful substance separation / extraction device 10 via a passage 9. The centrifuge 5 is a powder frame machine for crushing the dried product sent from the suction nozzle 3 and sending it to the harmful substance separation / extraction device 10. The centrifuge 5 is sequentially connected to an oil trap 6, a vacuum pump 7, and a filter 18 via an exhaust path 5b.

The harmful substance separation / extraction device 10 comprises a sealable tank for containing contaminated solids together with a solvent. The harmful substance separation / extraction device 10 contains an organic solvent for extraction and water for extraction. The harmful substance separation / extraction device 10 has a heating device 10a for heating the inside of the tank. The harmful substance separation / extraction device 10 has a suction device 21 and a stirrer 22. The stirrer 22 can be moved up and down by a vertical drive mechanism, and can stir the contents inside the harmful substance separation / extraction apparatus 10 with stirring blades. The suction device 21 has a nozzle that can be moved up and down by a vertical drive mechanism. The suction device 21 separates harmful substances from the nozzle The residue inside the extraction device 10 can be sucked.

 The harmful substance separation / extraction device 10 is connected to a concentration device 17 via a filter 15 and a pump 18. The concentrating device 17 comprises a sealable tank for recovering the vapor generated inside the harmful substance separation / extraction device 10. The concentrator 17 has a heating device 17a for heating and concentrating the contents of the concentrator 17. The concentration device 17 is connected to the harmful substance separation / extraction device 10 via a solvent vapor supply path 17b. The solvent vapor supply path 17b is composed of a pipe for sending the vapor generated from the concentrator 17 back to the harmful substance separation / extraction apparatus 10. The concentrator 17 is connected to the electrolyzer 19 via an on-off valve. The electrolyzer 19 is a device that decomposes harmful organic compounds such as dioxins and renders them harmless. The electrolyzer 19 has a configuration described in, for example, JP-A-2000-79377 and JP-A-2000-80489. The electrodes of the electrolyzer 19 are made of various materials such as gold electrodes, titanium electrodes, titanium oxide electrodes, silver electrodes, copper electrodes, diamond electrodes, glassy carbon electrodes, carbon electrodes, and modified electrodes thereof. be able to. In addition, various shapes such as a plate, a rod, a mesh, a porous, a fiber, a container, and a tube can be used for the electrode.

 The suction device 21 is connected to a residue processing device 24 via a suction pipe 20. The residue processing device 24 includes a sealable tank for containing the suctioned material by the suction device 21. The suction device 21 has a heating device 24a for heating and drying the contents of the residue processing device 24. The treated ash discharged from the residue processing device 24 is stored in the transport container 32. The residue processing device 24 is sequentially connected to an oil trap 40, a vacuum pump 39, and a filter 38 via an exhaust path 31a.

The residue processing device 24 is connected to a solvent tank 28. The solvent tank 28 is a tank for storing the organic solvent separated from the residue processing device 24. Dissolution The medium tank 28 is connected to the harmful substance separation / extraction apparatus 10 via a flow rate control valve 27 and a circulation pump 26 via a solvent supply path 28a. A water tank 30 is further connected to the flow control valve 27. The water tank 30 is a tank for storing water for extracting heavy metals. The flow rate control valve 27 controls the flow rate of the mixed solvent of the organic solvent from the solvent tank 28 and water from the water tank 30. The solvent supply path 28a is composed of a pipe for sending the organic solvent inside the solvent tank 28 and the water inside the water tank 30 to the harmful substance separation / extraction apparatus 10. The solvent tank 30 may be divided into an acidic tank and an alkaline tank.

 As shown in Fig. 1, the contaminated solids such as incineration ash charged into the mixing and crushing apparatus 1 are kept at approximately normal temperature, preferably 40 ° C to 60 ° C by the heating device la, and heated and stirred by the mixing and crushing device. Is done. The contaminated solids, which have been crushed to about 1 to 2 mm, are supplied to the centrifuge 5 through the movable suction nozzle 3. In the centrifuge 5 the contaminated solids are further finely crushed. The contaminated solid matter processed by the centrifuge 5 is supplied by gravity through a passage 9.

The toxic substance separation / extraction device 10 contains an organic solvent and water. In the stationary state, harmful substances such as dioxins, which are organic substances, are extracted from the organic solvent layer, which is the upper layer, and inorganic metals and heavy metals are extracted from the water layer, which is the lower layer. The organic solvent may be one or two of organic solvents for extraction, such as n-heptane, n-hexane, cyclohexane, xylene, tonoleene, benzene, diisopropynoleatenole, ethinoleate, ethyl methyl ketone, etc. More than one species is used. The organic solvent in which dioxins and the like are dissolved in the harmful substance separation / extraction device 10 is evaporated by the heat of the heating device 10a at 40 ° C to 60 ° C and sent to the concentrating device 17 via the filter 15 and the pump 18. Can be In the agriculture apparatus 17, harmful substances such as dioxin in the organic solvent are heated and concentrated by heat of about 110 ° C to about 150 ° C. The electrolyzer 19 can be rendered harmless by mixing an organic solvent in which dioxins and the like are dissolved with an organic solvent for electrolysis and performing electrolysis. it can.

 The ash and water remaining in the harmful substance separation / extraction device 10 from which dioxins have been removed are suctioned by vacuum using a suction device 21 and sent to a sedimentation type residue treatment device 24 through a suction pipe 20. . The organic solvent and water mixed with the extracted ash, metals, heavy metals, and the like in the residue treatment device 24 are collected in a solvent tank 28. The solvent mixed with the extracted ash, metals, heavy metals, etc. is heated and dried by the heating device 24a, discharged through the exhaust path 31a, the oil trap 40, the vacuum pump 39, and the filter 38 to the atmosphere. It is. The processed solids remaining in the residue processing device 24 are stored in the transport container 32 and disposed of.

 The organic solvent vaporized by the concentration from the concentration device 17 is returned to the harmful substance separation / extraction device 10 through the vapor supply path 17b. The organic solvent in the solvent tank 28 and the water in the water tank 30 are sent to the harmful substance separation / extraction device 10 through the flow control valve 27, the circulation pump 26, and the solvent supply path 28a, and circulated.

The following experiment was conducted using the above-mentioned toxic substance removing device and the above-mentioned method. First, 5 kg of incinerated ash as a contaminated solid was put into the mixing and crushing apparatus 1 and crushed by the centrifuge 5. This pulverized product is put into a hazardous substance separation / extraction unit 10 and subjected to extraction at 40 ° C using 10 liters of n-hexane as an organic solvent and 10 liters of a 5% hydrochloric acid solution as solvent water. Was performed. The vaporized extraction solvent was sent to the concentrator 17 by the pump 18 at a feed rate of 250 milliliters / minute. In the concentrator 17, the organic solvent was concentrated at 110 ° C. for 2 hours by heat and heat. The residue remaining in the harmful substance separation / extraction device 10 after the treatment was sent to the residue treatment device 24 by the suction device 21 and stored in the transport container 32. In this experiment, dioxin was detected at a concentration of 1 ppb in the contaminated solid matter before treatment, but no dioxin was detected in the treated matter contained in the transport container 32 due to the harmful substance removal treatment. The organic solvent concentrated in the concentrator 17 The medium contained dioxin at a concentration of 9.95 ppb.

 According to the method and apparatus for removing harmful substances described above, the residue after the dioxins and heavy metals extraction liquid separation step can be sucked from the harmful substance separation and extraction apparatus 10 and stored in the residue treatment apparatus 24. However, there is no need to open the harmful substance separation / extraction device 10 in order to remove the solid matter after the treatment. For this reason, even if dioxins and heavy metals remain inside the extraction device 10, there is no danger of exposure to harmful substances, and the purified solid can be safely handled.

 Further, according to the above-mentioned method and apparatus for removing harmful substances, it is not necessary to open the harmful substance separation and extraction apparatus 10 in order to remove the solid matter after the treatment. Even if the temperature inside the extraction device 10 is high, the purified solid can be taken out from the residue treatment device 24 and the treatment efficiency can be improved.

 ADVANTAGE OF THE INVENTION According to the harmful substance removal method and apparatus which concern on this invention, harmful substances can be processed safely and the processing efficiency can be improved.

Claims

The scope of the claims 1. an extraction step of extracting harmful substances from contaminated solids with a solvent in the extraction apparatus, and an extract separation step of separating a harmful substance extract from the solid-liquid mixture after the extraction step into a concentration apparatus, 5 A suction step of sucking the residue after the extract separation step from the inside of the extraction device to the residue processing device,  A concentration step of concentrating the harmful substance extract separated in the concentrator by the extract separation step;  A solvent recycling step of sending the solvent separated in the concentration step into the extraction device and 0,  A method for removing harmful substances, comprising: .  2. a solvent separation step of separating a solvent from the residue sucked by the residue processing apparatus in the suction step;  A recovered solvent reuse step of sending the solvent separated in the solvent separation step into the extraction device,  2. The method for removing harmful substances according to claim 1, wherein the method comprises: • 3. An extraction step in which dioxins are extracted from dioxin-contaminated solids with an organic solvent in an extraction device;  A dioxins separation step of separating a dioxins extract from the solid-liquid mixture after the extraction step in a concentrator,  A suction step of sucking the residue after the dioxins separation step from the inside of the extraction device to a residue processing device,  A concentration step of concentrating the dioxins extract separated in the concentrator by the dioxins separation step; 5 Reuse the organic solvent to send the organic solvent separated in the concentration step into the extraction device. Process and  A method for removing harmful substances, comprising: 4. an extraction step of extracting dioxins and heavy metals from dioxin-contaminated solids with an organic solvent and a mixed solvent of water in an extraction device;  A dioxins separation step of separating a dioxins extract from the solid-liquid mixture after the extraction step into a concentration device,  A heavy metal separation step of separating a heavy metal extract from the solid-liquid mixture after the extraction step into a heavy metal tank,  A dioxins concentration step of concentrating the dioxins extract separated in the concentration device in the dioxins separation step,  A suction step of sucking the residue after the dioxins separation step and the heavy metals separation step from the inside of the extraction device to a residue processing device,  A heavy metal concentration step of concentrating the heavy metal extraction liquid separated in the heavy metal tank by the heavy metal separation step;  An organic solvent recycling step of sending the organic solvent separated in the dioxins concentration step into the extraction device,  A water reuse step of sending water separated in the heavy metal concentration step into the extraction device. 5. The method for removing harmful substances according to claim 3, further comprising a decomposition step of decomposing dioxins contained in the dioxin extract concentrated in the concentration step.  6. An extraction process in which heavy metals are extracted from heavy metal-contaminated solids with water in the extraction device;  A heavy metal separation step of separating a heavy metal extract from the solid-liquid mixture after the extraction step into a heavy metal tank, The residue after the heavy metals separation step is subjected to a residue treatment apparatus from within the extraction device. A suction step of sucking into  A heavy metal concentration step of concentrating the heavy metal extraction liquid separated in the heavy metal tank by the heavy metal separation step;  A water reuse step of sending water separated in the heavy metal concentration step into the extraction device.  7. The method for removing harmful substances according to claim 4, wherein the water used in the extraction step is acidic water.  8. The method for removing harmful substances according to claim 4, wherein the water used in the extraction step is water. 9. The method for removing harmful substances according to claim 1, further comprising a pulverizing step of pulverizing contaminated solid matter before the extracting step.  10. The method for removing harmful substances according to any one of claims 1, 2, 3, 4, 4, 5, 6, 7, 8, and 9, further comprising a drying step of drying contaminated solid matter before the extraction step.  1 1. A sealable extraction device for containing the contaminated solids together with the solvent, and a stirrer for stirring the contents inside the extraction device,  An extraction heating device for heating the inside of the extraction device,  A sealable concentrator connected to the extraction device for recovering steam generated inside the extraction device;  A heating device for concentration for heating and concentrating the contents of the concentration device, a steam supply path for sending steam generated from the concentration device to the extraction device,  A suction device for suctioning the residue inside the extraction device, A sealable residue treatment device for accommodating the suctioned material by the suction device; A heating device for drying for heating and drying the contents of the residue processing device;  A harmful substance removing device, comprising: a solvent tank for containing a solvent separated from the residue processing device; and a solvent supply path for sending a solvent inside the solvent tank to the extraction device. . 1 2. A dryer for drying contaminated solids,  A crusher for crushing the dried product by the dryer and sending it to the extraction device;  The harmful substance removing apparatus according to claim 11, wherein the apparatus has: