JP2008200544A - Melt treatment method of waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt treatment method of waste capable of effectively utilizing activated carbon on which a harmful organic substance remaining in a decomposition gas is adsorbed. <P>SOLUTION: This melt treatment method of waste is equipped with: a first process for charging a PCB pollutant in a plasma decomposition furnace 1 to subject it to melt treatment; a second process for adsorbing the harmful organic substance, which remains in the decomposition gas of the PCB pollutant subject to melt treatment, by activated carbon in an activated carbon tank 7; and a third process for charging the activated carbon, on which the harmful organic substance is adsorbed, to the slag bath 11 in the plasma decomposition furnace 1 to produce heat in the activated carbon and to raise the temperature of the slag bath 11 in the plasma decomposition furnace 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method of melting waste containing polychlorinated biphenyl in a melting furnace, and in particular, disposal of sludge, waste, pressure sensitive paper, fluorescent light ballast, etc. contaminated with polychlorinated biphenyl (PCB). It is suitable for melting processing of products.

PCB is an oily substance whose molecular formula is represented by C ₁₂ H _n Cl _(10-n) (0 ≦ n ≦ 9) and has properties such as chemical stability. It was widely used in pressure sensitive paper, fluorescent light ballasts, etc., but because it is toxic to the human body and is not easily decomposed in the environment, it may be concentrated in the human body in the food chain. Currently it is prohibited.

As one of methods for detoxifying waste such as sludge, waste, pressure sensitive paper, and fluorescent light ballast (hereinafter referred to as PCB contaminated material) contaminated with PCB, for example, the technique disclosed in Patent Document 1 is known. It is. Here, PCB contaminants are melted in a plasma decomposition furnace, and the molten slag is carried out of the furnace, while the decomposition gas is passed through a constant temperature chamber, a temperature reducing tower, a bag filter, a catalytic reaction tower, and an activated carbon tank in this order. According to statutory environmental conditions, it is discharged into the atmosphere. That is, the activated carbon tank is filled with activated carbon, and in the unlikely event that harmful organic substances remain in the cracked gas discharged into the atmosphere, the so-called safety that adsorbs the harmful organic substances with the activated carbon. It has a function as a net.
JP 2005-262196 A

  By the way, when the PCB contaminants are melted in the plasma decomposition furnace, it is necessary to maintain the temperature of the slag bath formed in the plasma decomposition furnace within a predetermined range. The heat energy for the power supply was supplied by power supply to the plasma torch.

  On the other hand, activated carbon that adsorbs and removes harmful organic substances in the cracked gas sent from the plasma cracking furnace to the activated carbon tank has a limit of adsorption capacity due to its deterioration over time, so it remains in the cracked gas. Activated carbon adsorbed with toxic organic substances must be periodically replaced and separately treated, which has become a new PCB contaminant.

  The present invention has been made in view of the above-described problems, and provides a waste melting method that can effectively use activated carbon that has adsorbed harmful organic substances remaining in cracked gas.

  The first aspect of the present invention is a first step in which a waste containing polychlorinated biphenyl is put into a melting furnace and subjected to a melting treatment, and harmful organic substances remaining in the decomposition gas of the waste that has been subjected to the melting treatment are converted into activated carbon. A second step of adsorbing and a step of raising the temperature of the molten slag bath in the melting furnace by charging the activated carbon on which the harmful organic substance has been adsorbed into the molten slag bath in the melting furnace and heating the activated carbon. The waste melting process method is characterized by comprising three steps.

  As in the second aspect of the invention, in the third step, activated carbon having adsorbed harmful organic substances remaining in the cracked gas is charged into a molten slag bath in the melting furnace in a state of being enclosed in a container. It is preferable.

  According to the first aspect of the present invention, waste containing polychlorinated biphenyl is charged into a melting furnace and melted, and harmful organic substances remaining in the cracked gas of the melted waste are adsorbed on activated carbon. The activated carbon on which the harmful organic substances remaining in the cracked gas are adsorbed is put into the molten slag bath in the melting furnace, and the activated slag heats up to raise the temperature of the molten slag bath in the melting furnace. Therefore, it becomes possible to maintain the temperature of the molten slag bath in the melting furnace using activated carbon that has adsorbed the harmful organic substances remaining in the cracked gas as fuel. At this time, harmful organic substances adsorbed on the activated carbon are simultaneously melted and rendered harmless. Therefore, there is no need to separately process activated carbon that has adsorbed the harmful organic substances remaining in the cracked gas, so that there is a great economic merit.

  According to the second aspect of the present invention, activated carbon in which harmful organic substances remaining in the cracked gas are adsorbed is charged into a molten slag bath in the melting furnace in a state of being enclosed in a container. This facilitates the efficient combustion of activated carbon in the molten slag bath.

  FIG. 1 is an explanatory diagram schematically showing the overall configuration of a waste treatment apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing the overall configuration of a plasma melting furnace of the treatment apparatus, and FIG. A longitudinal cross-sectional view, (b) is an AA cross-sectional view in (a). As shown in FIG. 1, this processing apparatus includes a plasma decomposition furnace (melting furnace) 1, a constant temperature chamber 2, a temperature reducing tower 3, a first bag filter 4, a second bag filter 5, a catalytic reaction tower 6, and an activated carbon tank 7. It has.

  As shown in FIG. 2, the plasma decomposition furnace 1 is a batch type furnace capable of melting waste containing PCB (hereinafter referred to as PCB contaminated material) under a negative pressure. 8) and a container charging chamber 9 attached to the furnace body 8. The container loading chamber 9 is for loading a container 10 such as a drum can or a pail can filled with PCB contaminants or activated carbon into the furnace body 8. The container charging chamber 9 is on the left side of the furnace body 8 in FIG. 2A and has a square cross section, and a slag bath (molten slag bath) 11 formed of molten slag in the furnace body 8. (It is on the near side in FIG. 2B). The container loading chamber 9 is for loading a container 10 in which PCB contaminants and the like are enclosed outside into the negative pressure furnace main body 8. For this purpose, the container loading chamber 9 is, for example, a double lid that does not open simultaneously. It has an airtight structure. The posture (injection state) of the container 10 charged from the container charging chamber 9 into the furnace body 8 is arbitrary. For example, in the case of a drum can, the container 10 is rolled in the furnace body 8 to be described later. It is thrown sideways so that it can be brought almost directly below.

  The furnace main body 8 has a vertical cylindrical casing lined with a refractory, and a rotating shaft 13 (projecting from the approximate center in the left-right direction of the casing in FIG. 2 (b) protrudes from the left and right.) Is supported by a support member 14 standing on the base G so as to be rotatable. Then, by the expansion and contraction operation of the expansion cylinder 15 pin-coupled on the lower left side of the furnace body 8 and on the base G, the furnace body 8 is rotated around the rotation shaft 13 and inclined by a predetermined angle from the horizontal state. It can be in an inclined state.

  At the ceiling of the furnace body 8, a plasma torch 12 for melting PCB contaminants and activated carbon enclosed in a container 10 and charged from the container charging chamber 9 together with their cans, and the state of melting are monitored. A measuring device 16 such as a camera is installed. Note that the inside of the furnace body 8 is set to a negative pressure, and harmful gas generated when PCB contaminants sealed in the container 10 melt from the seal portion of the furnace body 8 does not leak to the outside. ing.

  The exhaust outlet 17 passes through the central portion of the rotating shaft 13 (on the right side in FIG. 2B) on the rear side of the furnace body 8 in FIG. The exhaust can be guided to the outside without being affected by the rotation. The exhaust outlet 17 is opened in the furnace body 8 in an atmosphere above the slag surface in which waste and the like are melted together with the container 10. And the atmosphere in this furnace main body 8 is attracted | sucked by the 1st and 2nd attracting fan mentioned later as exhaust_gas | exhaustion, and is discharged | emitted outside.

  The molten slag outlet 18 is on the right side of the furnace body 8 in FIG. 2A and has a horizontally long rectangular cross section. By the rotation of the furnace body 8, a slag container 19 in which the molten slag is installed at the lower part. It is provided slightly above the surface of the slag bath 11 so that it can be discharged inside. The molten slag outlet 18 is formed by extracting a part of the refractory lined on the furnace body 8, and slopes are formed in front of the molten slag outlet 18 (furnace inside) and immediately after (furnace outside), respectively. Has been.

  The slope in front of the molten slag outlet 18 has a relatively gentle upslope, which causes the vessel 10 charged into the furnace body 8 to stop almost directly below the plasma torch 12, and the vessel 10 with the plasma torch 12. A dam for retaining molten slag obtained by melting together with PCB contaminants at a predetermined height is configured to smoothly guide the molten slag exceeding the weir to the molten slag outlet 18.

  In addition, the slope immediately after the molten slag outlet 18 has a relatively steep downward slope, and this is for causing the molten slag discharged from the molten slag outlet 18 to drop into the slag container 19 by gravity. A guide 20 is also provided for accurately guiding the molten slag falling from the slope to the slag container 19. When the molten slag enters the slag container 19, the molten slag is cooled here to become solid slag, and is then carried out to the outside. In addition, the conveyance path | route of the molten slag from the molten slag exit 18 to the slag container 19 has an airtight structure covered with the bellows, for example.

  As the plasma torch 12, for example, a non-transition type having a positive and negative electrodes in a torch main body movable with three degrees of freedom is used. In this plasma torch 12, a gas is continuously sent between the anode and the cathode, and a plasma arc of 15000 ° C. or more generated by energizing both electrodes with a power supply device 12b controlled by the plasma control panel 12a, The temperature of the gas is increased. Thus, after the PCB contaminants etc. which were thrown in in the furnace main body 8 are melted by the plasma gas irradiated from the plasma torch 12, and the slag bath 11 is formed in the furnace main body 8, this slag bath 11 The slag bath 11 is maintained at about 1400-1500 ° C. by burning the activated carbon further introduced therein or by evaporating water supplied as appropriate from a supply line (not shown). The PCB is decomposed in the furnace body 8. The plasma torch 12 is supplied with cooling water so that the main body of the torch is cooled.

  The constant temperature chamber 2 is a chamber to which exhaust gas such as combustion gas generated in the furnace body 8 of the plasma decomposition furnace 1 and water vapor are supplied. When the PCB is decomposed in the plasma decomposition furnace 1, the constant temperature chamber 2 is subjected to thermal polymerization. In addition, when something that is volatilized while being transformed into a harmful organic substance such as dioxins having a high degree of pollution remains in the exhaust gas, it is for decomposing the remaining harmful organic substance. The constant temperature chamber 2 is maintained at 1200 ° C. or higher by the natural gas burner 2a, and the supplied exhaust gas stays in the constant temperature chamber 2 for two seconds or more.

  The temperature-decreasing tower 3 is for cooling the exhaust gas supplied from the constant-temperature chamber 2, and this cooling prevents the dioxins from being re-synthesized. In order to perform rapid cooling in the temperature reducing tower 3, cooling water and cooling air are used. The outlet temperature of the temperature reducing tower 3 is 140 to 260 ° C.

  The first bag filter 4 and the second bag filter 5 are devices for collecting dust. The first bag filter 4 sucks powdered activated carbon to adsorb and remove a small amount of harmful organic substances such as dioxins. To do. The second bag filter 5 adds slaked lime to adsorb and remove acidic gas such as HCl in the exhaust gas and has not only dust collection but also a desalting function.

  The present invention is not limited to this. For example, slaked lime may be blown into the first bag filter 4, or another adsorbent having an adsorption function such as dioxin may be blown in place of the powdered activated carbon. The powdered activated carbon may be blown into the second bag filter.

  The catalytic reaction tower 6 decomposes the re-synthesized dioxins and the like, and also decomposes NOx. The catalytic reaction tower 6 is formed by kneading a metal that can be a catalyst such as titanium, vanadium, and nickel into ceramic. 6 is housed.

  The activated carbon tank 7 has a function as a so-called safety net that adsorbs harmful organic substances in the final stage of the system, and is filled with activated carbon. That is, the activated carbon tank 7 adsorbs harmful organic substances such as PCB and dioxin remaining in the decomposition gas of the PCB contaminant melted in the plasma decomposition furnace 1 to the activated carbon, and the plasma decomposition furnace 1 The adsorbed activated carbon is introduced into the slag bath 11 in the furnace body 8 from the container introduction chamber 9, and before this introduction, the harmful organic substances remaining in the cracked gas were adsorbed in the activated carbon tank 7. The activated carbon is preferably taken out by vacuum suction or the like and sealed in a container 10 such as a drum can.

Here, the particle diameter of the activated carbon charged into the furnace body 8 of the plasma decomposition furnace 1 is preferably about φ5 to 10 mm. This is because when activated carbon is sealed in the container 10 and is charged into the slag bath 11 in the furnace body 8 from the container charging chamber 9, even if the container 10 melts, the activated carbon inside the slag bath 11 This is because it floats on the surface of the metal and oxidizes and becomes easy to generate heat, and heat is applied to the slag bath 11 well. As for the timing of charging this activated carbon, an appropriate number of containers 10 are charged into the furnace body 8 from the container charging chamber 9 when it is determined by monitoring by a measuring device 16 such as a camera that the slag bath 11 has started to solidify. What should I do? According to the experiment of the present inventor, the required amount of activated carbon input / the hearth area was about 6 kg / m ² .

A first induction fan 21 is provided in the flow path between the second bag filter 5 and the catalytic reaction tower 6, and a second induction fan 22 is provided in the flow path downstream of the activated carbon tank 7. It has been. Further, a circulation passage 23 is provided for returning the exhaust gas from the passage between the first induction fan 21 and the catalytic reaction tower 6 to the passage between the temperature reducing tower 3 and the first bag filter 4 for circulation. ing. An on-line analyzer 24 that analyzes exhaust gases such as NOx, HCl, CO, CO ₂ , and O ₂ is provided in the flow path on the downstream side of the second induction fan 22. For example, an infrared gas analyzer can be used as the online analyzer 24. This infrared gas analyzer converts an infrared absorption difference between a sampling gas and a reference gas into an electric signal.

  Hereinafter, a method for melting the PCB contaminants using this processing apparatus will be described.

  First, a container 10 filled with PCB contaminants, which are objects to be processed, is charged into a container charging chamber 9 of the plasma decomposition furnace 1. The container 10 introduced into the container introduction chamber is transferred into the furnace body 8 of the plasma decomposition furnace 1 by being pressed by a pusher (not shown), for example.

  The container 10 transferred into the furnace body 8 is melted by the high-temperature plasma gas generated from the plasma torch 12 mounted on the ceiling of the furnace body 8 (first step). In the furnace body 8, molten slag is stored to some extent to form a slag bath 11. And the container 10 thrown in sequentially into the furnace main body 8 from the container charging chamber 9 is immersed in the slag bath 11 in this furnace main body 8, and the heat | fever of the slag bath 11 is transmitted and it melt | dissolves.

  At this time, in the activated carbon tank 7, PCBs and the like remaining in the decomposition gas of the waste melted in the plasma decomposition furnace 1 are adsorbed on the activated carbon (second step). The activated carbon on which the PCB or the like is adsorbed is taken out from the activated carbon tank 7 by vacuum suction or the like and enclosed in a container 10. The container 10 is charged from the container charging chamber 9 of the plasma decomposition furnace 1 into the slag bath 11 in the furnace body 8 at the timing as described above, and the plasma decomposition furnace 1 is heated by the generated activated carbon. The temperature of the slag bath 11 in the furnace body 8 is raised (third step).

  That is, the portion immersed in the slag bath 11 of the charged container 10 is dissolved by the heat of the slag bath 11, and the portion not immersed in the slag bath 11 is dissolved by the high temperature plasma gas generated in the plasma torch 12. The container 10 is efficiently dissolved. In addition, after the container 10 is dissolved, the activated carbon in the container spreads and floats on the surface of the slag bath 11 and is oxidized to generate heat and raise the temperature of the slag bath 11. When the temperature of the slag bath 11 becomes too high, the temperature of the slag bath 11 can be lowered by evaporation of water droplets supplied as appropriate, and the slag bath 11 can be maintained at 1400 to 1500 ° C.

  Incombustible materials such as earth and sand, metal, and concrete shells are melted to form slag, and are stored in the slag container 19 and discharged to the outside of the plasma decomposition furnace 1. The slag accumulated in the furnace is accommodated in the slag container 19 as described above by appropriately tilting the furnace body 8 of the plasma decomposition furnace 1.

  On the other hand, the exhaust gas combusted in the furnace body 8 of the plasma decomposition furnace 1 is supplied to the constant temperature chamber 2 of the next process together with water vapor. As described above, the constant temperature chamber 2 is maintained at 1200 ° C. or higher, and the supplied exhaust gas is stored in the constant temperature chamber 2 for two seconds or more and then discharged from the constant temperature chamber 2.

  At this time, the PCB contained in the contaminant that is the object to be treated is completely decomposed in the plasma decomposition furnace 1 maintained at a high temperature. Moreover, even though PCB was decomposed in the plasma decomposition furnace 1, even if it was volatilized in the exhaust while being transformed into harmful organic substances such as dioxins having higher pollution degree due to thermal polymerization, As described above, the trace amount of harmful organic substances is completely decomposed by staying in the constant temperature chamber 2 maintained at 1200 ° C. or more for 2 seconds or more.

  Next, the exhaust gas that has passed through the constant temperature chamber 2 is further supplied to the temperature reducing tower 3 and cooled by cooling water and cooling air. Thus, since the exhaust gas supplied to the temperature reducing tower 3 is cooled by the cooling water and the cooling air, dioxins are not re-synthesized. That is, if the exhaust gas after PCB decomposition is present in an atmosphere in which the temperature is gradually changed within a temperature range of 200 to 500 ° C., there is a high possibility that dioxins are re-synthesized. On the other hand, as described above, when the exhaust gas after being treated at a high temperature of 1100 ° C. or higher in the plasma decomposition furnace 1 or the constant temperature chamber 2 is cooled down to about 200 ° C. in the temperature reducing tower 3, dioxins are re-synthesized. Is almost completely prevented.

  The cooled exhaust gas is supplied to the first bag filter 4 and powdered activated carbon is blown into it. As described above, the PCB should be completely decomposed in the plasma decomposition furnace 1, and the recombination of dioxins should be prevented in the temperature reducing tower 3. Even if a small amount of dioxins is synthesized, the harmful organic substances are adsorbed by the activated carbon blown into the first bag filter 4 and are removed. Moreover, the activated carbon which adsorb | sucked the harmful organic substance which passed the 1st bag filter 4 and the 2nd bag filter 5 with the activated carbon tank 7 is regularly extracted from the activated carbon tank 7, and is replaced | exchanged for a new thing. Activated carbon extracted from the activated carbon tank 7 is sealed in a container 10 and transferred to the plasma decomposition furnace 1 in the third step, and as described above, fuel for maintaining the temperature of the slag bath 11 in the furnace body 8. Used as

  The exhaust gas that has passed through the first bag filter 4 is supplied to the second bag filter 5. In the second bag filter 5, slaked lime is added and an oxidizing gas such as HCl is adsorbed and removed. That is, HCl, SOx, and the like are generated in the exhaust gas processed in the plasma decomposition furnace 1, the constant temperature chamber 2, etc., but the HCl, SOx, etc. are reacted with slaked lime to convert the exhaust gas into dust. For example, in the case of HCl, the following reaction is assumed.

Ca (OH) ₂ + 2HCl → CaCl ₂ + 2H ₂ O (1)
Further, the exhaust gas after passing through the second bag filter 5 is supplied to the catalytic reaction tower 6. In the catalytic reaction tower 6, ammonia is blown to decompose NOx. That is, since nitrogen exhaust is present in the plasma decomposition furnace 1, there is a possibility that NOx is generated when it passes through the thermostatic chamber 2, the temperature reducing tower 3, the first bag filter 4, and the second bag filter 5 thereafter. However, NOx is suitably decomposed by blowing ammonia in the catalytic reaction tower 6. As the decomposition reaction of NOx, the following reaction is assumed.

NO ₂ + NO + 2NH ₃ + O ₂ → 2N ₂ + 3H ₂ O (2)
Further, even if a small amount of dioxins is re-synthesized and is not gradually dusted by the first bag filter 4, the dioxins are decomposed in the catalytic reaction tower 6.

  The exhaust gas after passing through the catalytic reaction tower 6 is further supplied to the activated carbon tank 7. As described above, the activated carbon tank 7 functions as a safety net in the case where harmful organic substances remain in the final stage of the system. Even if dioxins are re-synthesized, they can be adsorbed on the activated carbon in the activated carbon tank 7, so that the harmful organic substances are not inadvertently discharged out of the system. In this way, harmful components can be adsorbed and removed by the activated carbon tank 7 as a safety net. The activated carbon in the activated carbon tank 7 is periodically exchanged, and the activated carbon taken out from the activated carbon tank 7 is sealed in a container 10 and supplied to the container charging chamber 9 of the plasma decomposition furnace 1.

It should be noted that components such as NOx, HCl, CO, CO ₂ , and O ₂ in the exhaust discharged outside the system are analyzed by the online analyzer 24. Further, a first induction fan 21 is provided in the flow path between the second bag filter 5 and the catalytic reaction tower 6, and a second induction fan 22 is provided in the flow path downstream of the activated carbon tank 7. Thus, the system can maintain a negative pressure in the system upstream of the second induction fan 22 by these.

  Next, a circulation flow path 23 is provided for circulating the exhaust gas from the flow path between the first induction fan 21 and the catalytic reaction tower 6 to the flow path between the temperature reducing tower 3 and the first bag filter 4. Therefore, by adjusting the flow rate of the exhaust gas flowing through the circulation channel 23, the inside of the plasma decomposition furnace 1, the constant temperature chamber 2, the temperature reducing tower 3, the first bag filter 4, the second bag filter 5, etc. As a result, the pressure in the system can be kept constant. Dust from the temperature reducing tower 3, the first bag filter 4, and the second bag filter 5 is enclosed in a drum can or the like, and is discharged out of the system as solid matter together with the slag enclosed in the slag discharge container 19.

  According to this embodiment, the harmful organic substance remaining in the decomposition gas of the PCB contaminant melted in the furnace body 8 of the plasma decomposition furnace 1 is adsorbed by the activated carbon in the activated carbon tank 7, and this harmful organic substance is The adsorbed activated carbon is put into the slag bath 11 in the furnace main body 8 of the plasma decomposition furnace 1, and the slag bath 11 in the furnace main body 8 of the plasma decomposition furnace 1 is heated by the heat generated by the charged activated carbon. Then, the temperature of the slag bath 11 in the furnace body 8 can be maintained using activated carbon in which harmful organic substances remaining in the cracked gas are adsorbed as fuel. At this time, residual harmful organic substances in the cracked gas adsorbed on the activated carbon are simultaneously melted and rendered harmless. Therefore, there is no need to separately process activated carbon on which the residual harmful organic substances in the cracked gas are adsorbed, resulting in great economic merit. In addition, activated carbon in which the residual harmful organic substances in the cracked gas are adsorbed is charged in the slag bath 11 in the furnace body 8 of the plasma decomposition furnace 1 in a state where the activated carbon is sealed in the container 10, so that the activated carbon can be handled easily. In addition, efficient combustion of the activated carbon in the slag bath 11 is performed.

  In the third step of the above embodiment, the activated carbon on which the residual harmful organic substances in the cracked gas are adsorbed is sealed in the container 10 and manually in the furnace body 8 from the container charging chamber 9 of the plasma decomposition furnace 1. However, a special feeder or the like from the activated carbon tank 7 to the plasma decomposition furnace 1 is provided so that the activated carbon in the activated carbon tank 7 is periodically extracted and automatically supplied to the plasma decomposition furnace 1. However, it may be possible to make a manual input.

  Moreover, in the said embodiment, although it is supposed that the activated carbon with which the activated carbon tank 7 was filled is used effectively, activated carbon etc. which are loaded in the local exhaust line used for the negative pressure management in a system are also effective similarly. Can be used.

It is explanatory drawing which shows typically the whole structure of the waste-processing apparatus which concerns on one Embodiment of this invention. It is a figure which shows the whole structure of the plasma melting furnace of this processing apparatus, Comprising: (a) is a longitudinal cross-sectional view, (b) is AA sectional drawing in (a).

Explanation of symbols

1 Plasma decomposition furnace (melting furnace)
2 Constant temperature chamber 3 Temperature reducing tower 4 First bag filter 5 Second bag filter 6 Catalytic reaction tower 7 Activated carbon tank 8 Furnace body 9 Container input chamber 10 Container 11 Slag bath (molten slag bath)
12 Plasma Torch 21 First Induction Fan 22 Second Induction Fan 23 Circulation Channel 24 Online Analyzer

Claims (2)

A first step in which waste containing polychlorinated biphenyl is charged into a melting furnace and melted;
A second step in which the activated carbon adsorbs harmful organic substances remaining in the decomposition gas of the waste that has been subjected to the melting treatment;
And a third step of heating the activated slag bath in the melting furnace by charging the activated carbon on which the toxic organic substance has been adsorbed into the molten slag bath in the melting furnace to generate heat. A waste melting method characterized by the above.   2. The method according to claim 1, wherein, in the third step, activated carbon on which harmful organic substances remaining in the cracked gas are adsorbed is charged into a molten slag bath in the melting furnace in a state of being enclosed in a container. Waste melting method.

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