JP4734649B2 - Decomposition processing apparatus and decomposition processing method of hardly decomposable organic compound - Google Patents

Description

  The present invention relates to a decomposition processing apparatus and a decomposition processing method for a hardly decomposable organic compound that heats a contaminant and decomposes the hardly decomposable organic compound in the contaminant.

  Dioxins are organic compounds that are highly toxic and hardly decomposable, and these dioxins are problematic as environmental pollutants. Dioxins are a general term for polychlorinated dibenzoparadoxine (PCDD) and polychlorinated dibenzofuran (PCDF), which are produced by the decomposition of herbicides, and are also included in waste incineration ash, paper sludge, automobile exhaust gas, etc. It is.

  In order to reduce the concentration of dioxins in the atmosphere, many methods and apparatuses for treating dioxins have been proposed. Among them, the superheated steam reaction method has been proposed as a method that can effectively reduce the concentration of chlorofluorocarbons as well as dioxins (see, for example, Patent Documents 1 to 3).

  In the superheated steam reaction method, soil or sludge contaminated with dioxin is supplied to a gasifier, heated at a temperature of about 400 ° C. to 600 ° C. exceeding the boiling point of dioxin, gasified, and contains gasified dioxin. In this method, superheated steam is added to the gas and further heated to about 900 ° C. to 1000 ° C., and dioxins are decomposed by a reduction reaction. By this method, dioxins are decomposed into carbon monoxide, hydrogen, hydrogen chloride, etc., and air or oxygen is supplied to the cracked gas to oxidize and detoxify. This cracked gas contains hydrogen chloride that exhibits acidity when dissolved in water, and is passed through cooling water or an alkaline aqueous solution to remove this. The cooling water or the aqueous alkali solution quenches the detoxified gas, and the aqueous alkaline solution neutralizes the hydrogen chloride as it exhibits acidity when dissolved. When the detoxified gas is gradually cooled, dioxins may be generated again, and therefore rapid cooling is essential here. The gas from which hydrogen chloride has been removed mainly comprises carbon dioxide and water vapor. Although most harmful substances are removed in these reactions, they may remain in trace amounts, so they are removed by adsorption through an activated carbon tower. When these harmful substances are removed, they are released into the atmosphere by a blower or the like.

In this superheated steam reaction method, an environmental standard value (2,3,7,8-dibenzo-parachloride) is obtained by simply supplying superheated steam and air to a persistent organic compound in pollutants such as contaminated soil and sludge. -It can be sufficiently decomposed and removed below the value (TEQ) converted to dioxin toxicity. Incidentally, the environmental standard value of dioxins is 0.6 pg-TEQ / Nm ³ or less in 1 m ^{3 of} air, 1 pg-TEQ / L or less in 1 L of water, and 1000 pg-TEQ / g or less in 1 g of soil.

  A gasifier used in a superheated steam reaction method includes a hollow cylindrical container that contains contaminants, and an electric heater that is provided around the hollow cylindrical container and indirectly heats the contaminants inside through the wall surface of the hollow cylindrical container. It is set as the structure provided with. In addition, a screw is provided in the hollow cylindrical container, and the contained contaminant can be moved in the horizontal direction by this screw. In this apparatus, while the contaminant is horizontally moved by the screw, heat is applied by an electric heater, and the contaminant is heated to about 400 ° C. to 600 ° C. which is the gasification temperature of the hardly decomposable organic compound. As a result, the moisture in the contaminants evaporates and is further heated to become superheated steam, the hardly decomposable organic compound is gasified, and these gases are hollow cylindrical containers installed so that their length direction is horizontal. The soil is removed from the nozzle provided on the upper side, and the soil from which moisture and the hardly decomposable organic compound are removed is ejected from the nozzle provided on the lower side.

The evaporated water and the gasified hardly decomposable organic compound are sent to the reactor for the decomposition treatment of the hardly decomposable organic compound, and the discharged soil is taken out after natural cooling. This soil has a concentration of persistent organic compounds that are pollutants sufficiently lower than the environmental standard value, and can be reused as soil for backfilling and the like. Further, the hardly decomposable organic compound and superheated steam sent to the reactor are heated to about 900 ° C. to 1000 ° C. by an electric heater, and the hardly decomposable organic compound reacts with the superheated steam to produce carbon monoxide, chloride. Decomposed into low molecules such as hydrogen and hydrogen.
JP 2002-219354 A Japanese Patent Laid-Open No. 10-165803 JP-A-10-000349

  Conventional decomposition processing devices for persistent organic compounds require a gasifier for gasifying the persistent organic compounds in pollutants and a reactor for decomposing the gasified persistent organic compounds, and gas Since the conversion apparatus and the reaction apparatus are heated by an electric heater, there is a problem that a large amount of power consumption is required and the operation cost is high. In addition, the gasifier needs to be heated from room temperature to about 400 ° C to 600 ° C, and the reactor needs to be heated from the gasifier to about 900 ° C to 1000 ° C, ensuring a large heat transfer area for the electric heater. There is a problem that the residence time needs to be lengthened, the apparatus cost increases, and the processing takes time.

  Furthermore, since the amount of the hard-to-decompose organic compound contained in the contaminant is not uniform, the amount of volatile gas greatly fluctuates and the processing amount has to be changed. The reaction time in the reactor is about 900 ° C. to 1000 ° C. for several seconds, and there is a problem that the reaction may be insufficient due to the large fluctuation of the volatile gas amount, and the reactor may be left untreated. .

  In addition, since most of the power consumption required for heating is used to evaporate the water in the pollutants, more power is required for pollutants with a high moisture content. It was necessary to lengthen the residence time. In this case, a lot of superheated steam is generated, but the amount of superheated steam required for decomposition may be the same as the molar amount of the hardly decomposable organic compound, and there is a problem that a lot of superheated steam is wasted. . A dehydrator can be installed to lower the moisture content, but an additional device called a dehydrator is required, and if the moisture content becomes too low, the superheated steam required for the reaction is insufficient. There is.

  Therefore, the generated superheated steam can be used effectively to reduce the load on the electric heater, to reduce the equipment cost and the operating cost, to shorten the processing time, and to make it difficult to decompose organic matter. It is desired to provide an apparatus capable of stably performing a decomposition treatment reaction of a compound.

  In view of the above-mentioned problems, the present invention has a configuration in which the gasifier is divided into two, and one is necessary for the reaction by recovering only the vapor by utilizing the difference in boiling point between water and the hardly decomposable organic compound. The amount of steam can be supplied, and the other gasifies persistent organic compounds. The remaining steam is used to preheat the contaminants in a feeder (conveying means) that supplies the contaminants to the gasifier. Thereby, the load of the heater used for a gasifier can be reduced. In the present invention, two gasifiers are employed. When heated to a temperature of about 600 ° C. in the second stage gasifier, the hardly decomposable organic compound is gasified and decomposed by reacting with superheated steam. I found out. Thereby, a reaction apparatus can be made unnecessary, an apparatus cost can be reduced and a process process can be decreased.

That is, according to the present invention, conveying means for indirectly heating with superheated steam while conveying contaminants containing a hardly decomposable organic compound,
First heating means for indirectly heating the contaminants supplied by the conveying means is evaporated, moisture remaining in the contaminants is evaporated by the first heating means, and a part of the generated superheated steam is transferred to the second gasifier. A first gasifier that sends out the remainder to the conveying means;
A second heating means for indirectly heating the pollutant discharged from the first gasifier and a part of the superheated steam; gasifying the hardly decomposable organic compound in the pollutant by the second heating means; There is provided a decomposition treatment apparatus for a hardly decomposable organic compound, including a second gasification device that reacts with steam to decompose the hardly decomposable organic compound.

  The conveying means includes a double tube composed of an inner tube and an outer tube, a shaft member installed in the inner tube and rotatably supported at both ends, and a conveying spiral blade disposed around the shaft member. And a transporting propulsion means for moving the contaminant in one direction by the rotation of the shaft member. In this case, the superheated steam can be supplied between the inner tube and the outer tube of the double tube, and the contaminants passing through the inner tube can be indirectly heated.

  Furthermore, a cooling device that cools the decomposition gas generated by decomposing the hardly decomposable organic compound and liquefies the undecomposed hardly decomposable organic compound, and an adsorption device that adsorbs the liquefied hardly decomposable organic compound to the adsorbent. Can be included. In addition, after regenerating the adsorbent by supplying superheated steam to the adsorption device and volatilizing the adsorbed hardly decomposable organic compound, the volatilized hardly decomposable organic compound and superheated steam are heated, and the hardly decomposable organic compound is heated. If necessary, a small reactor for decomposing the compound can be provided. A filter for removing impurities in the cracked gas can be included, and the removed impurities can be supplied to the reactor and also decomposed.

  Contaminants in the first gasifier are heated to about 200 ° C. to 300 ° C., and contaminants in the second gasifier are heated to about 500 ° C. to 600 ° C.

  As a 1st gasification apparatus, the 1st hollow provided with the 1st soil receiving port for receiving a contaminant, the 1st discharge port for discharging | emitting a contaminant, and the steam delivery port for sending out superheated steam A first container comprising: a cylindrical container; a first central axis disposed in the first hollow cylindrical container and rotatably supported at both ends; and a first spiral blade arranged around the first central axis. First soil propulsion means for moving the contaminants received from the receiving port toward the first discharge port, and first heating that is provided around the first hollow cylindrical container and indirectly heats the contaminants in the first hollow cylindrical container Means.

  In addition, the second gasifier includes a second soil receiving port for receiving contaminants, a steam receiving port for receiving a part of superheated steam, a gas discharge port for discharging cracked gas, and a difficulty. A second hollow cylindrical container having a second discharge port for discharging the purified soil from which the decomposable organic compound has been separated; and a second hollow cylinder disposed in the second hollow cylindrical container and supported at both ends rotatably. A second soil propulsion means comprising a central axis and a second spiral blade arranged around the second central axis, and moving contaminants received from the second soil reception port toward the second discharge port; The second heating means is provided around the two hollow cylindrical containers and indirectly heats the contaminants in the second hollow cylindrical container.

  The second gasifier can include a soil container that is continuous with the second discharge port and stores the soil from which the volatile organic compound has been removed.

  According to the present invention, a method for decomposing a hardly decomposable organic compound can also be provided. This method includes a step of indirectly heating with superheated steam while transporting a contaminant containing a hardly decomposable organic compound by a transport means, and indirectly heating the transported contaminant by a first gasifier. The residual moisture is evaporated to generate superheated steam, and the second gasification unit indirectly heats the pollutant and a part of the generated superheated steam to gas the hardly decomposable organic compound in the pollutant. And a process of decomposing the hardly decomposable organic compound by reacting with superheated steam and a process of sending the remaining superheated steam generated by the first gasifier to the conveying means.

  In addition, the step of cooling the decomposition gas generated by decomposing the hardly decomposable organic compound, liquefying the undecomposed hardly decomposable organic compound, and the step of adsorbing the liquefied hardly decomposable organic compound to the adsorbent. Further can be included. In this case, a process of supplying superheated steam to volatilize the hardly decomposable organic compound adsorbed on the adsorbent and regenerating the adsorbent, heating the volatilized hardly decomposable organic compound and superheated steam, And a step of decomposing the organic compound. Moreover, the process of removing the impurity in cracked gas with a filter, and the process of supplying the removed impurity to a reaction apparatus can be included.

  In the step of generating superheated steam, the contaminant is heated to about 200 ° C. to 300 ° C., and in the step of decomposing the hardly decomposable organic compound, the contaminant is heated to about 500 ° C. to 600 ° C.

  By providing the decomposition processing apparatus and the decomposition processing method for a hardly decomposable organic compound of the present invention, it is possible to sufficiently remove the hardly decomposable organic compound in the contaminant. In addition, power consumption can be reduced, and the apparatus cost and operation cost can be reduced. Further, the treatment time can be shortened, and the decomposition treatment reaction of the hardly decomposable organic compound can be performed stably.

  Although the decomposition processing apparatus of the hardly decomposable organic compound of this invention is demonstrated in detail with reference to drawings, this invention is not limited to embodiment shown by drawing. FIG. 1 is a diagram showing an embodiment of a decomposition treatment apparatus for a hardly decomposable organic compound. The decomposition treatment apparatus 10 shown in FIG. 1 has a conveying means 11 for conveying a contaminant containing a hardly decomposable organic compound, and accepts the conveyed contaminant and heats it to a predetermined temperature to evaporate water in the contaminant. The first gasifier 12 to be separated, the contaminant and the superheated steam are received, further heated to gasify the hardly decomposable organic compound in the contaminant, and the gasified hardly decomposed organic compound and the superheated steam are And a second gasifier 13 for decomposing a hardly decomposable organic compound by reaction. Here, superheated steam means water vapor having a temperature exceeding the saturation temperature at the pressure of the vapor, and means water vapor having a temperature exceeding 100 ° C. at normal pressure.

  First, contaminants and pretreatment will be described. Examples of the pollutant include contaminated soil contaminated with a hardly decomposable organic compound such as dioxins and bottom mud contaminated with a hardly decomposable organic compound in a bay port. In addition to persistent organic compounds such as dioxins, this contaminated soil may contain heavy metals, gravel, glass fragments, and a large amount of moisture. Gravel, glass fragments, etc. have a large particle size and may damage the transport means 11, the first gasifier 12, and the second gasifier 13. Therefore, it is possible to provide a pretreatment device such as a classification device equipped with a sieve, remove these in advance, and prevent troubles of the device due to the biting of foreign matter. Since this classifier can arrange soil particles, it is possible to uniformly heat contaminated soil. For example, a sieve having a mesh size of about 15 mm, about 20 mm, or about 25 mm can be used. This classifying device can be provided with a rocking device for rocking the sieve.

  The bottom mud contaminated with harbor dioxins has a water content ratio (ratio of water to dry soil excluding water) of about 2-3 after dredging. This can be transported by the transport means 11 as it is, but it is necessary to evaporate excess water and more power is consumed. In this case, a dehydrator can be provided. Examples of the dehydrating device include a device that contains sludge and has a plurality of holes on its side surface, and rotates the container to centrifuge the water through the many holes. However, if the water content of the bottom mud is too low, the amount of superheated steam generated is reduced, so even if it is used, the water content is reduced to about 0.3 to 1.

  Next, the decomposition processing apparatus 10 will be described. The transport means 11 indirectly heats the contaminants with superheated steam while transporting them, and supplies them to the first gasifier 12. Thereby, before supplying to the 1st gasification apparatus 12, a contaminant is preheated to a certain temperature, and most of the water | moisture content contained in a contaminant is evaporated. The heating temperature and the evaporation amount of the contaminant change depending on the temperature and amount of the superheated steam. The conveying means 11 and the first gasifier 12 are connected, and the airtightness of the first gasifier 12 is maintained by the conveyance of contaminants by the conveying means 11.

  The first gasifier 12 includes first heating means (not shown) that indirectly heats the contaminants, evaporates moisture remaining in the contaminants that have not yet evaporated, further heats the steam, and generates superheated steam. Generate. A part of this superheated steam is sent to the second gasifier 13 and the rest is sent to the transport means 11.

  When the contaminated soil is treated at 100 kg / Hr, when the moisture content of the contaminated soil is 10% and the carbon amount is 1% of the dry weight of the contaminated soil, the amount of superheated steam required for the reaction is calculated. Is equivalent to the molar amount of carbon. In general, since the content of dioxins and the like is very small, the amount of vapor calculated from the molar amount of carbon is sufficient. That is, the dry weight of the contaminated soil is 90 kg / Hr, and 1% of that is the amount of carbon, so the amount of steam is calculated as 75 mol / Hr. Theoretically, the reaction can be achieved if there is a superheated steam with a molar amount approximately equal to the amount of carbon, but since this superheated steam has a function of raising the soil temperature, it is 2 to 5 times the amount of carbon. is required. Therefore, the required amount of steam is 150 mol / Hr to 375 mol / Hr, that is, about 3 kg / Hr to 7 kg / Hr. In the first gasifier 12, since the moisture content is 10%, about 10 kg / Hr of superheated steam is generated. From this, it is possible to send superheated steam of about 3 kg / Hr to 7 kg / Hr to the second gasifier 13 and send the remainder to the conveying means 11. The amount of superheated steam can be controlled by providing a valve on the steam supply line connected to the second gasifier 13 and adjusting the valve opening. In addition, the density | concentration of the hardly decomposable organic compound in a contaminant can be measured previously using a density | concentration measuring apparatus.

  The 1st gasification apparatus 12 heats a contaminant to about 200 to 300 degreeC by a 1st heating means. This is to reduce the moisture content of the contaminants (hereinafter, the moisture content indicates the moisture reference moisture content) to 1% or less. If the heating temperature of the contaminant is about 150 ° C. to 200 ° C., the moisture content can be reduced by evaporating the moisture, but at this temperature, the heat conduction to the water intervening in the interior surrounded by the soil particles is reduced. Since it is slow, in order to sufficiently heat the inside thereof, the residence time of the contaminants in the first gasifier 11 must be long such as several hours. Considering the processing efficiency, the residence time is preferably about several tens of minutes. In order to achieve this residence time, it is necessary to set the temperature higher than that. For example, the residence time of contaminants in the first gasifier 12 is about 10 to 30 minutes, and in order to reduce the moisture content to 1% or less within this time, it is necessary to heat to about 200 ° C. to 300 ° C. It is. In general, soil having a high water content is likely to be granulated while being heated to about 300 ° C. to 400 ° C., which is a gasification temperature from normal temperature, and heat transfer efficiency may be reduced. In order to prevent this, it is necessary to supply the gasification apparatus with a moisture content of contaminants below a predetermined moisture content. In the present invention, since this is preheated by the conveying means 11 and most of the water is evaporated and then supplied to the first gasifier 12, this problem does not occur.

In the first gasifier 12, the amount of water required for the reaction, that is, the amount of carbon of dioxin (molecular formula C ₁₂ H ₄ O ₂ Cl ₄ having a molecular weight of 322) as described above is the dry weight of the contaminated soil. When about 3 kg / Hr to 7 kg / Hr remain as moisture with respect to 90 kg / Hr of dry soil, the second gasifier 13 can sufficiently react. However, it is difficult to control the amount of evaporation by the first gasifier 12, and depending on the supplied soil, the concentration of the hardly decomposable organic compound is high, and more superheated steam necessary for the reaction may be required. Moreover, when there is too much superheated steam amount, a big load is applied to the 2nd heating means of the 2nd gasification apparatus 13. FIG. For this reason, the first gasifier 12 evaporates water as much as possible so that the water content is 1% or less, and collects it as superheated steam, and then sends an appropriate amount of superheated steam to the second gasifier 13. Yes.

  The second gasifier 13 includes second heating means (not shown) that indirectly heats the contaminants discharged from the first gasifier 12 and a part of the superheated steam. By this second heating means, the hardly decomposable organic compound in the pollutant is gasified, the gasified hardly decomposable organic compound is reacted with superheated steam, and the hardly decomposable organic compound is decomposed into low molecules. .

  The hardly decomposable organic compound includes dioxins, and the dioxins are compounds having a benzene ring. There are tens to hundreds of types of dioxins having different chlorine substitution positions and different numbers of chlorine in PCDD and PCDF. They have different boiling points and gasify in ascending order of boiling point. In the second gasifier 13, the contaminant is heated to about 400 ° C. to 600 ° C. at which all of the hardly decomposable organic compound is gasified. However, if it is mixed with superheated steam at about 500 ° C. to 600 ° C., the contaminant is hardly decomposed. The benzene ring of the organic organic compound is broken by a reaction with superheated steam and decomposed into low molecules such as carbon monoxide, carbon dioxide, hydrogen, and hydrogen chloride.

  When moisture is present in the contaminants, most of the amount of heat provided by the second heating means is used for heating and evaporating the water. This is because the sensible heat of water and the latent heat of evaporation are larger than the sensible heat of steam and the sensible heat of soil components. In the second gasifier 13, since the supplied contaminants have almost no moisture, the amount of heat given by the second heating means can be used for heating the contaminants and superheated steam, and these can be used for about 500 in a short time. It can be heated to from ℃ to 600 ℃. For this reason, among the residence time of the contaminants in the second gasifier 13, it is possible to lengthen the time that is maintained at about 500 ° C. to 600 ° C., and sufficiently gasify and decompose the hardly decomposable organic compound. be able to. The superheated steam also has a role as a lubricant, and can smoothly move the soil by preventing friction, high heat, and baking from occurring between the contaminant and the spiral blade described later in the second gasifier 13. it can.

  In the 2nd gasifier 13, it isolate | separates into the gasified difficult-to-decompose organic compound, decomposition gas, surplus superheated steam, and the soil from which the hardly-decomposable organic compound was removed, and the soil is the 2nd gasifier 13 Is sent to a soil container 14 connected to, and naturally cooled. Since this hard-to-decompose organic compound is below the environmental standard value and most of this soil is a soil component, it can be reused as soil for backfilling. The soil container 14 is a sealed container so that a hardly decomposable organic compound and decomposition gas mixed in the soil discharged from the second gasifier 13 are not released into the atmosphere. This soil container 14 is provided with an outlet for taking out the soil, and the soil can be taken out from the outlet after the treatment is completed.

  The superheated steam discharged from the conveying means 11 is a superheated steam although the temperature is lowered, a saturated steam, a case where it is condensed water, and a case where steam and condensed water are mixed. In any case, it can be used as another heat source. In the embodiment shown in FIG. 1, the cooling tank 15 is not used as another heating source and contains almost no contaminants such as a hardly decomposable organic compound. It is supplied to the inside, cooled, and recovered as cooling water. The cooling tank 15 can supply and discharge a predetermined amount of cooling water as needed, and the discharged water can be supplied again after being cooled by a cooling device such as a cooling tower.

  With reference to FIG. 2 and FIG. 3, the conveyance means 11 and the gasifier are demonstrated. FIG. 2 is a diagram showing an embodiment of the transport unit 11. The conveying means 11 shown in FIG. 2 includes a double pipe composed of an inner pipe 20 and an outer pipe 21, a shaft member 22 provided in the inner pipe 20 and supported at both ends so as to be rotatable, and a shaft member 22 around the shaft member 22. And a conveying propulsion means provided with a conveying spiral blade 23 provided.

  The double pipe is composed of two pipes having the same length and different diameters, both ends of which are closed, both ends are closed, and the inner pipe 20 having a small diameter is connected to the soil supply nozzle 20a for supplying contaminants. Soil discharge nozzle 20b for discharging material, steam supply nozzle 21a for supplying superheated steam between inner tube 20 and outer tube 21, and steam discharge nozzle 21b for discharging superheated steam And. The double tube is manufactured from a material that can withstand this temperature to supply superheated steam at about 200 ° C to 300 ° C. The superheated steam is at almost normal pressure, and can be produced from, for example, carbon steel, chromium-molybdenum steel, stainless steel or the like. The diameters of the inner tube 20 and the outer tube 21 can be determined by the supply amount of contaminants to be processed and the amount of superheated steam to be supplied.

  The shaft member 22 and the conveying spiral blade 23 can also be manufactured from the same material as the double tube. The shaft member 22 is disposed along the length direction at the center of the inner tube 20, and both ends thereof are rotatably supported. For example, a hole through which the shaft member 22 can be inserted is provided at the center of each of the two closing plates that close both ends of the double tube, and both ends are rotatably supported by inserting the shaft member 22 into the hole. State. The conveying spiral blade 23 is provided around the shaft member 22, and can move contaminants by the rotation of the shaft member 22. The diameter of the conveying spiral blade 23 is formed slightly smaller than the diameter of the inner tube 20 so as not to contact the inner wall of the inner tube 20 during rotation. A motor 24 is connected to the shaft member 22, and the motor 24 can rotate the shaft member 22 at a constant rotational speed.

  The soil supply nozzle 20a is connected to, for example, a hopper provided with a valve in the lower part. Pretreated contaminants are placed in the hopper, and contaminants can be supplied into the inner tube 20 by opening the valve. The soil discharge nozzle 20 b is connected to the first gasifier 12. As for the connection with the first gasifier 12, the nozzles can be directly connected to each other, or can be connected via a container such as a buffer tank or a short pipe. Since the soil discharge nozzle 20b and the first gasifier 12 are connected and the inner tube 20 is filled with contaminants, the inside of the first gasifier 12 can be kept airtight.

  The steam supply nozzle 21 a is connected via a pipe so as to communicate with the steam outlet of the first gasifier 12. The steam discharge nozzle 21b can be connected to the cooling tank 15 via a pipe, and can be supplied and cooled in cooling water. It can also be released into the atmosphere and diffused into the atmosphere. When the length of the double pipe is long and the flow area of the superheated steam is small, the superheated steam condenses by sufficiently giving heat to the internal contaminants and is discharged as condensed water.

  A plurality of conveying means 11 can be connected and used according to the distance to the gasifier. When connecting and using two or more, it can connect using a short tube for connection, an elbow, etc. The conveying means 11 can be arranged in a slanted manner in addition to being horizontally arranged in the length direction. Moreover, the conveyance means 11 can also wind a heat insulating material around the outer periphery of a double tube, and can also improve thermal efficiency.

  FIG. 3 is a diagram showing an embodiment of a gasifier. The gasifier shown in FIG. 3 includes a first gasifier 12 installed at the top and a second gasifier 13 installed at the bottom. The first gasifier 12 includes a hollow cylindrical container 30 having three nozzles, a soil propelling means 31 that moves the contaminants from the receiving port to the outlet, and internal contaminants through the wall surface of the hollow cylindrical container 30. And a heating means 32 that indirectly heats. Moreover, the 2nd gasifier 13 is set as the structure similar to the 1st gasifier 12 except that the hollow cylindrical container 40 is provided with four nozzles.

  The hollow cylindrical container 30 is a container having a capacity capable of accommodating a predetermined amount of soil, and is heated from about 200 ° C. to 300 ° C. by the heating means 32, and thus is manufactured from the same material as the double pipe or the like. . The hollow cylindrical container 30 has a cylindrical shape elongated in one side, and is installed such that its length direction extends in the horizontal direction. Both end portions can be semi-elliptical end plates that can receive the internal pressure evenly.

  The hollow cylindrical container 30 is provided with a soil receiving port 33 facing upward at a position adjacent to one end, a steam outlet 34 facing upward at a position adjacent to the other end, And a soil discharge port 35 that faces the surface. These are nozzles and are connected to the conveying means 11, the superheated steam delivery line, and the second gasifier 13, respectively.

  The soil propulsion means 31 includes a central shaft 36 that is disposed in the hollow cylindrical container 30 and is rotatably supported at both ends, and a spiral blade 37 that is provided around the central shaft 36. The central shaft 36 and the spiral blade 37 are the same as the shaft member 22 and the transporting spiral blade 23 described above. A motor 38 is connected to the central shaft 36 so that the central shaft 36 can be rotated at a constant rotational speed. The contaminant is received from the soil receiving port 33 and moves from the soil receiving port 33 to the soil discharge port 35 by the rotation of the spiral blade 37. The moving speed can be controlled by adjusting the rotation speed of the motor 38. For example, it can be set so that the time until the contaminant received at the soil receiving port 33 reaches the soil outlet 35 is about 15 minutes. This rotational speed can be appropriately determined depending on the soil component of the contaminant, the particle size, the concentration of the hardly decomposable organic compound, the water content ratio, and the like. The soil propelling means 31 is preferably a screw having spiral blades, for example. The screw has the function of agitating the contaminants with this spiral blade, which allows the superheated steam to diffuse into the contaminants and to heat the contaminants uniformly. In the present invention, the soil propulsion means 31 may be a reciprocating piston.

  The heating means 32 indirectly heats the inside of the hollow cylindrical container 30 and can be an electric heater wound around the outer wall of the hollow cylindrical container 30. The electric heater includes a resistance heating element, which includes an iron-chromium-aluminum metal heating element, a nickel-chromium metal heating element, a platinum-molybdenum-tantalum-tungsten metal heating element, and a silicon carbide-silicite non-heating element. A metal heating element, a silicon carbide-carbon nonmetallic heating element, a molybdenum-silicite nonmetallic heating element, and a molybdenum-carbon nonmetallic heating element can be mentioned. Further, in order to efficiently give the heat generated by each heating element to the internal contaminants, it is preferable to cover the periphery of the heating means 32 provided around the hollow cylindrical container 30 with a heat insulating material or the like.

  The second gasifier 13 has the same configuration as the first gasifier 12 except that the hollow cylindrical container 40 includes four nozzles, and includes a soil propulsion unit 41 and a heating unit 42. The soil propelling means 41 includes a central shaft 43 and a spiral blade 44, and a motor 45 is connected to the central shaft 43. The heating means 42 can be an electric heater including a resistance heating element similar to the heating means 32, and can be attached so as to be wound around the outer wall of the hollow cylindrical container 40.

  The hollow cylindrical container 40 of the second gasifier 13 has a soil inlet 46 facing upward and a steam inlet 47 for receiving superheated steam also facing upward at a position near one end. And a gas discharge port 48 for discharging upward gas and a soil discharge port 49 for discharging soil facing downward at a position adjacent to the other end.

  The soil receiving port 46 is continuous with the soil outlet 35 of the first gasifier 12 and receives the soil discharged from the first gasifier 12. The steam inlet 47 is continuous with the steam outlet 34 of the first gasifier 12 and receives a part of superheated steam generated in the first gasifier 12 after the amount of steam is adjusted by a valve. . The gas discharge port 48 discharges the hardly decomposable organic compound gasified and decomposed by the second gasifier 13 as a decomposition gas. This gas contains carbon monoxide, hydrogen, hydrogen chloride, undecomposed persistent organic compounds and superheated steam. The soil discharge port 49 is continuous with the soil container 14 shown in FIG. 1, and discharges the soil that has been purified after removing the hardly decomposable organic compound. In this discharged soil, the hardly decomposable organic compound is separated and removed, and its concentration is below the environmental standard value.

  Although it is not restricted to the structure which has arrange | positioned the 1st gasifier 12 like the embodiment shown in FIG. 3 at the upper part of the 2nd gasifier 13, it is 2nd by dropping from the 1st gasifier 12. Since it can supply to the gasifier 13, the apparatus which conveys a contaminant becomes unnecessary and the structure of embodiment shown in FIG. 3 is preferable at the point which can make installation space small.

  FIG. 4 is a diagram showing another embodiment of the decomposition processing apparatus. The decomposition treatment apparatus shown in FIG. 4 includes the conveying means 11, the first gasification apparatus 12, the second gasification apparatus 13, and the soil container 14 shown in FIGS. 1 to 3, but further includes a cooling apparatus 50, The suction device 51 is included. The hardly decomposable organic compound can be sufficiently decomposed by the second gasifier 13, but the undecomposed hardly decomposable organic compound may remain only by gasification. This varies depending on the concentration of the hardly decomposable organic compound, the heating temperature, the amount of superheated steam, etc., and about 10% to 30% of the hardly decomposable organic compound to be gasified may remain. In such a case, the decomposition processing apparatus of the embodiment shown in FIG. 4 is suitable. Since the transport means 11, the first gasifier 12, the second gasifier 13, and the soil container 14 have already been described, the cooling device 50 and the adsorption device 51 will be described here.

  The cooling device 50 cools the gas discharged from the second gasifier 13. Thereby, the volatilized hardly decomposable organic compound is liquefied. The cooling device 50 is provided with two nozzles, each of which contains cooling water and is a sealed tank, one tip of which is immersed in the cooling water and the other tip is not soaked. The scrubber can be cooled by bubbling in water. Further, it may be a scrubber that includes a spray nozzle, sprays water, and cools the gas. In addition, it can also be set as the apparatus which consists of the tank in which the cooling water was accommodated, and the coiled pipe | tube immersed in cooling water. In FIG. 4, only one scrubber is shown as the cooling device 50, but in order to operate continuously, it is composed of at least two scrubbers, and one scrubber cools the gas with one scrubber, and one scrubber absorbs and regenerates. It is preferable to be able to do so.

  The adsorbing device 51 is filled with an adsorbing material, and the refractory organic compound liquefied is passed through the filled adsorbing material and adsorbed on the adsorbing material. In the embodiment shown in FIG. 4, since the hardly decomposable organic compound is liquefied in the cooling water, the hardly decomposable organic compound is adsorbed through the adsorbent together with the cooling water. As this adsorbent, activated carbon can be used, and zeolite or the like can also be used as others. Note that a decomposition gas such as carbon monoxide and hydrogen chloride can also be adsorbed on the adsorbent. The cooling water after the hardly decomposable organic compound is adsorbed is discharged from the nozzle 51 a below the adsorbing device 51.

  The gas components bubbled by the cooling device 50 include carbon monoxide, carbon dioxide, hydrogen chloride, steam, and the like. The hydrogen chloride is dissolved in the cooling water of the cooling device 50, and the carbon monoxide is For example, it can be made harmless by burning. As the combustion apparatus, any apparatus known so far can be used. Although cooling with cooling water has been described here, an alkaline aqueous solution described below can also be used.

  FIG. 5 is a view showing still another embodiment of the decomposition processing apparatus. The decomposition processing apparatus shown in FIG. 5 is further provided with a reaction device 52, a cooling device 53, an adsorption device 54, a blower 55 as a discharge means, and a coagulation tank 56 in the configuration shown in FIG. The reactor 52 can be a cylindrical tube provided with a heating means such as a heater, and can be decomposed only by passing a hardly decomposable organic compound and superheated steam. Since this reaction device 52 only needs to decompose a small amount of a hardly decomposable organic compound, the reaction device 52 can be made smaller than conventional reaction devices.

  The hardly decomposable organic compound adsorbed on the adsorbent of the adsorption device 51 is periodically regenerated by flowing superheated steam. Thereby, the replacement | exchange frequency of adsorption material can be reduced and material cost can be suppressed. In order to adsorb the liquefied hardly decomposable organic compound, a liquid is supplied from above the adsorbent, and in the regeneration of the adsorbent, superheated steam is flowed from below to above the adsorbent. By supplying the superheated steam, the hardly decomposable organic compound adsorbed on the adsorbent is gasified and sent to the reactor 52 together with the superheated steam.

  In the reaction device 52, the hardly decomposable organic compound and the superheated steam are heated to about 900 ° C. to 1000 ° C., and the hardly decomposable organic compound is reacted with the superheated steam to be decomposed into low molecules. The heating means provided around the cylindrical tube is used to keep the temperature in the cylindrical tube constant, and includes a gas heating means for heating the hardly decomposable organic compound and the superheated steam to about 900 ° C. to 1000 ° C. You can also. These heating means may be an electric heater, a heating furnace, an electromagnetic induction heating device, or the like. Here, electromagnetic induction heating will be briefly described. When a conducting wire is wound in a coil shape and a conductive material such as a metal is disposed in the vicinity thereof, an eddy current flows in the conductive material due to the influence of magnetic lines generated when an alternating current is passed through the conducting wire. The conductive material usually has electric resistance, and when a current flows, Joule heat is generated and the conductive material is heated. This is electromagnetic induction heating. Examples of the electromagnetic induction heating device include a cylindrical tube wound with a conducting wire. By passing gas through the cylindrical tube, it can be heated to a predetermined temperature.

  Further, air can be fed into the reactor 52 in order to render the carbon monoxide contained in the decomposed gas harmless. This air can be supplied together with the hardly decomposable organic compound or superheated steam or in the middle of the cylindrical tube constituting the reaction device 52, so that the temperature in the reaction device 52 does not decrease. It is preferable to supply by heating to ° C. This carbon monoxide reacts with air in the reaction device 52 to be oxidized and converted to carbon dioxide. The air fed into the reaction device 52 can be supplied using, for example, a blower or an air compressor, and the air can be heated using a heater, a heating furnace, the electromagnetic induction heating device, or the like. In addition to the regeneration of the adsorbent, the reaction device 52 can heat the gas discharged from the cooling device 50, send in air and burn it, and detoxify the carbon monoxide.

  As with the cooling device 50, a scrubber can be used for the cooling device 53. Here, in order not to re-synthesize the hardly decomposable organic compound, the decomposition gas is rapidly cooled. The cooling device 53 uses an alkaline aqueous solution instead of the cooling water, and can neutralize the aqueous solution in which hydrogen chloride is dissolved in water and exhibits acidity. In this case, the alkali may be any substance known so far, and examples thereof include potassium hydroxide and sodium hydroxide. In this case, a part of carbon dioxide in the cracked gas can be reacted with an alkali. For example, when the alkali is sodium hydroxide, the following reaction occurs.

The above reaction produces sodium carbonate (Na ₂ CO ₃ ), which is highly soluble in water. In this way, in addition to hydrogen chloride, carbon dioxide can also be dissolved and not discharged into the atmosphere.

  In the cooling device 53, a small amount of nitrogen, oxygen, or the like other than carbon dioxide and hydrogen chloride dissolved in the cooling water or the alkaline aqueous solution is released from one nozzle as bubbles in the cooling water or the alkaline aqueous solution, and the tip is in the gas phase. Is discharged from the other nozzle. The same treatment is repeated in a plurality of tanks, and they are sufficiently cooled.

  The adsorbing device 54 is the same as the adsorbing device 51, but passes a gas discharged from the cooling device 53 and adsorbs a trace component to the adsorbing material. This adsorbent can also be activated carbon, zeolite, or the like. Most of the gas components discharged from the adsorption device 54 are nitrogen and oxygen, which are components of the air sucked in the reaction device 52, and these are released into the atmosphere by the blower 55 as harmless gases. The decomposition processing apparatus is sucked by the blower 55 and can maintain the inside of the apparatus at a negative pressure lower than the atmospheric pressure. By doing so, it is possible to prevent the gasified hardly decomposable organic compound from leaking into the atmosphere.

  The hydrogen chloride and the like recovered in the cooling device 53 is sent to the coagulation tank 56. The agglomeration tank 56 is added with a predetermined amount of an aggregating agent, and is separated into a wastewater that is a liquid and a residue that is an agglomerate. This residue can be again supplied to the gasifier together with the contaminants for decomposition.

  Although not shown, a filter for removing impurities in the cracked gas can be further provided on the downstream side of the cooling device 50. The impurities removed by the filter can be decomposed by sending them to the gasifier or reactor 52. This gasifier may be the first gasifier 12 and the second gasifier 13, or may be a small gasifier provided separately. The small gasifier provided separately may be any device that can heat impurities.

  With reference to FIG. 6, the decomposition processing method of a hardly decomposable organic compound is demonstrated. Contaminants are put into the hopper 60, the valve 61 provided at the lower part of the hopper 60 is opened, and supplied into the inner pipe through the soil supply nozzle in the transport means 11. By rotating the shaft member and rotating the conveying spiral blade, the contaminant is moved to the soil discharge nozzle, superheated steam is received from the steam supply nozzle, and the contaminant is indirectly heated by the superheated steam. Since the superheated steam is not generated in the first gasifier 12 at the start, the superheated steam can be generated by using a separately provided boiler or the like. At the start, heating by the first gasifier 12 can be performed without heating by the superheated steam in the transport unit 11.

  Depending on the moving speed and the amount of superheated steam, the transport means 11 evaporates most of the water in the pollutant, and the moisture content in the pollutant is reduced to about 10% to 30%. Contaminants and steam discharged from the soil discharge nozzle are supplied into the hollow cylindrical container through the soil inlet of the first gasifier 12 in communication. The first gasifier 12 has an internal temperature of about 200 ° C. to 300 ° C. in advance by heating means. Contaminants are supplied into the interior maintained at about 200 ° C. to 300 ° C., and the center axis is rotated to rotate the spiral blades, whereby the contaminants are moved to the soil discharge port and indirectly heated. The time for moving from the soil inlet to the soil outlet, that is, the residence time, is preferably about 10 to 30 minutes in order to treat a predetermined amount of contaminants in a short time.

  The 1st gasifier 12 produces | generates a superheated steam of about 200 to 300 degreeC while heating a contaminant to about 200 to 300 degreeC in a soil discharge port. The superheated steam is discharged through the steam outlet and is supplied to the second gasifier 13 and the conveying means 11 through a line 62 connected to the steam outlet. The line 62 is provided with a control valve 63, and the amount of superheated steam delivered to the second gasifier 13 is controlled by the control valve 63. The line 62 may be provided with a vapor storage container and stored. By using the steam storage container, it is possible to use superheated steam at the start. In order to suppress a decrease in the temperature of the superheated steam, the steam storage container may be covered with a heat insulating material or the like, and may be wound and heated with an electric heater or the like.

  As described above, the amount of superheated steam adjusted by the control valve 63 can be set to 2 to 5 times the molar amount of carbon in the dioxins. The pollutant discharged from the soil discharge port is supplied to the inside from the soil receiving port of the second gasifier 13 that is continuous with the soil discharge port. Similarly to the first gasifier 12, the second gasifier 13 is preheated to a temperature to be heated by the heating means, that is, about 500 ° C to 600 ° C. Contaminants are supplied to the preheated interior. In the 2nd gasifier 13, by rotating a center axis | shaft and rotating a spiral blade, a contaminant is moved to a soil discharge port, and it heats indirectly. By this heating, the hardly decomposable organic compound is gasified from the low boiling point component. Along with the supply of contaminants, superheated steam heated to about 200 ° C. to 300 ° C. from the steam inlet is also supplied. The superheated steam functions as a lubricant and reacts with the gasified hardly decomposable organic compound to decompose the hardly decomposable organic compound. The spiral blade moves the contaminants and also has the function of stirring the contaminants, exposing the hardly decomposable organic compounds present between the soil particles, and gasifying almost all the hardly decomposable organic compounds. Can be made.

  The decomposed hardly decomposable organic compound becomes low molecules such as carbon monoxide, hydrogen, hydrogen chloride, and is discharged from the gas outlet. Contaminants are discharged from the soil outlet to the soil container 14 connected to the soil outlet as the soil from which the persistent organic compounds are gasified and separated by this heating, and the persistent organic compounds are removed. Is done. In the soil container 14, it is naturally cooled to approximately room temperature and then taken out for reuse.

  At the downstream side of the second gasifier 13, the cracked gas discharged from the gas outlet is cooled by the cooling device 50, and the hardly decomposable organic compound contained in the cracked gas is liquefied in the cooling water. At this time, the valve 64 is opened, the valves 65 and 66 are closed, and the gas is cooled. If the cooling device 50 is composed of two scrubbers, one will only open the valve 64 and close the other valve as described above to cool the gas, while the other is In the scrubber, the valves 64 and 66 are closed, the valve 65 is opened, and the liquefied hardly decomposable organic compound is sent to the adsorption device 51 together with the cooling water. When there is only one scrubber, the cooling water containing the liquefied hardly decomposable organic compound is sent to the adsorption device 51 after the supply of contaminants to the gasifier is completed.

  The adsorption device 51 is configured to repeat adsorption and desorption every predetermined cycle. After adsorption, the valves 64 and 65 are closed, the valve 66 is opened, superheated steam is supplied, and the hardly decomposable matter adsorbed on the adsorbent is adsorbed. Volatile organic compounds and regenerate the adsorbent. In this case, the adsorbed carbon monoxide and the like are desorbed, and superheated steam is added together with the volatilized hardly-decomposable organic compound, which is sent to the reactor 52. The reactor 52 is heated to about 900 ° C. to 1000 ° C., and the hardly decomposable organic compound is decomposed. Air can be sent into the reactor 52, and by sending air in, the carbon monoxide is oxidized and converted into carbon dioxide. The treated gas is sent to the cooling device 53 and rapidly cooled.

  As described above, the cooling device 53 collects carbon dioxide, hydrogen chloride, and the like, and the adsorption device 54 adsorbs and removes trace components and releases harmless gases such as nitrogen and oxygen into the atmosphere. The cooling water and the alkaline aqueous solution in the cooling device 53 are collected in the agglomeration tank 56 and separated into waste water and residue.

  Although the apparatus of the present invention has been described in detail with reference to the drawings so far, the diameter and length of each hollow cylindrical container, the number of turns of the spiral blade of the soil propelling means, the diameter of each receiving port and outlet, purification The shape and size of the soil container may be anything and can be appropriately determined depending on the amount of soil treated. The material of the hollow cylindrical container may be steel, copper, aluminum, or an alloy thereof. A cooling device, an adsorption device, a reaction device, a coagulation tank, a blower, a boiler, and the like can be provided as necessary, and any carbon monoxide or hydrogen chloride produced by decomposition can be processed. Devices other than the cooling device, the adsorption device, and the reaction device can also be used.

The figure which showed embodiment of the decomposition processing apparatus of a hardly decomposable organic compound. The figure which showed embodiment of the conveyance means which can be used for a decomposition processing apparatus. The figure which showed embodiment of the gasification apparatus which can be used for a decomposition processing apparatus. The figure which showed another embodiment of the decomposition processing apparatus. The figure which showed another embodiment of the decomposition processing apparatus. The figure which showed the flow which decomposes | disassembles the hardly decomposable organic compound in a pollutant.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Decomposition processing apparatus, 11 ... Conveyance means, 12 ... 1st gasifier, 13 ... 2nd gasifier, 14 ... Soil container, 15 ... Cooling tank, 20 ... Inner pipe | tube, 20a ... Nozzle for soil supply, 20b ... Soil discharge nozzle, 21 ... Outer tube, 21a ... Vapor supply nozzle, 21b ... Vapor discharge nozzle, 22 ... Shaft member, 23 ... Conveying spiral blade, 24, 38, 45 ... Motor, 30, 40 ... hollow cylindrical container, 31, 41 ... soil propulsion means, 32, 42 ... heating means, 33, 46 ... soil accepting port, 34 ... steam outlet, 35, 49 ... soil outlet, 36, 43 ... central axis, 37 44 ... spiral blades, 47 ... steam inlet, 48 ... gas outlet, 50, 53 ... cooling device, 51, 54 ... adsorption device, 51a ... nozzle, 52 ... reactor, 55 ... blower, 56 ... coagulation tank , 60 ... Popper, 61, 64, 65, 6 ... valve, 62 ... line, 63 ... control valve

Claims (13)

An apparatus that gasifies and decomposes the persistent organic compound in the pollutant contaminated by the persistent organic compound,
Conveying means for indirectly heating with superheated steam while conveying the contaminant containing the persistent organic compound,
First heating means for indirectly heating the contaminants supplied by the transport means is evaporated, moisture remaining in the contaminants is evaporated by the first heating means, and a part of the generated superheated steam is second. A first gasifier for sending to the gasifier and sending the remainder to the conveying means;
A second heating unit that indirectly heats the contaminant discharged from the first gasifier and a part of the superheated steam, and the second heating unit converts the hardly decomposable organic compound in the contaminant. A decomposition treatment apparatus for a hardly decomposable organic compound, comprising: the second gasification apparatus that gasifies and decomposes the hardly decomposable organic compound by reacting with the superheated steam.   The conveying means includes a double tube comprising an inner tube and an outer tube, a shaft member provided in the inner tube and supported rotatably at both ends, and a conveying spiral blade provided around the shaft member. And a transfer propulsion means for moving the contaminant in one direction by rotation of the shaft member, and the superheated steam is supplied between the inner pipe and the outer pipe. Decomposition processing apparatus as described.   A cooling device that cools a decomposition gas generated by decomposing the hardly decomposable organic compound and liquefies the undecomposed hardly decomposed organic compound, and an adsorption that adsorbs the liquefied hardly decomposed organic compound on an adsorbent. The decomposition processing apparatus according to claim 1, comprising an apparatus.   Supplying the superheated steam to the adsorption device and regenerating the adsorbent by volatilizing the adsorbed organic compound that has been adsorbed, and then heating the volatilized organic compound and the superheated vapor, The decomposition processing apparatus according to claim 3, further comprising a reaction apparatus that decomposes the hardly decomposable organic compound.   The decomposition processing apparatus according to claim 4, further comprising a filter for removing impurities in the cracked gas, wherein the removed impurities are supplied to the reaction apparatus.   The said 1st gasifier heats the said contaminant to 200 to 300 degreeC, and the said 2nd gasifier heats the said contaminant to 500 to 600 degreeC in any one of Claims 1-5. The decomposition processing apparatus according to item 1. The first gasifier includes a first soil receiving port for receiving the contaminants, a first soil outlet for discharging the contaminants, and a steam outlet for sending the superheated steam. A first hollow cylindrical container, a first central axis that is disposed in the first hollow cylindrical container and is rotatably supported at both ends, and a first spiral blade that is provided around the first central axis. And a first soil propelling means for moving the contaminant received from the first soil receiving port toward the first soil discharge port, and the first hollow cylinder is provided around the first hollow cylinder. The first heating means for indirectly heating the contaminant in the container,
The second gasifier includes a second soil receiving port for receiving the contaminant, a steam receiving port for receiving a part of the superheated steam, a gas discharge port for discharging the cracked gas, A second hollow cylindrical container having a second soil discharge port for discharging the purified soil from which the hardly decomposable organic compound has been separated, and the second hollow cylindrical container, the both ends of which are rotatably supported And the second spiral blade provided around the second central axis, the contaminant received from the second soil receiving port is moved toward the second soil outlet. Any one of Claims 1-6 including the 2nd soil propulsion means to be made, and the said 2nd heating means which is provided in the said 2nd hollow cylindrical container, and indirectly heats the said contaminant in the said 2nd hollow cylindrical container The decomposition processing apparatus according to claim 1.   The said 2nd gasification apparatus is a decomposition processing apparatus of Claim 7 containing the soil container which accommodates the soil from which the said volatile organic compound was removed following the said 2nd soil discharge port. A method of gasifying and decomposing the hardly decomposable organic compound in the pollutant contaminated by the hardly decomposable organic compound,
A step of indirectly heating with superheated steam while conveying the contaminant containing the hardly decomposable organic compound by a conveying means;
A step of indirectly heating the conveyed contaminant by the first gasification device to evaporate water remaining in the contaminant and generating superheated steam;
The second gasification device indirectly heats the contaminant and a part of the generated superheated steam to gasify the hardly decomposable organic compound in the contaminant, and reacts with the superheated steam to cause the reaction. A step of decomposing a hardly decomposable organic compound;
A process for decomposing a hardly decomposable organic compound, comprising a step of sending the remaining superheated steam generated by the first gasifier to the transporting means.   Cooling a cracked gas produced by decomposing the hardly decomposable organic compound, liquefying the undecomposed unresolved organic compound, and adsorbing the liquefied hardly decomposed organic compound on an adsorbent; The decomposition processing method according to claim 9, further comprising:   Supplying the superheated steam, volatilizing the hardly decomposable organic compound adsorbed on the adsorbent and regenerating the adsorbent, heating the volatilized hardly decomposed organic compound and the superheated steam, The decomposition treatment method according to claim 10, further comprising a step of decomposing the hardly decomposable organic compound.   The decomposition processing method according to claim 11, comprising a step of removing impurities in the decomposition gas with a filter and a step of supplying the removed impurities to the reactor.   The contaminant is heated to 200 ° C to 300 ° C in the step of generating the superheated steam, and the contaminant is heated to 500 ° C to 600 ° C in the step of decomposing the hardly decomposable organic compound. The decomposition | disassembly method of any one of -12.

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