JP3702424B2 - Waste treatment method and treatment system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating waste (garbage) such as organic waste mainly containing carbon, such as wooden waste, food waste, waste gasification char, sewage sludge, and the waste treatment system. Specifically, the present invention relates to an invention including a method and a system for removing dioxins in exhaust gas generated when incinerating waste.
[0002]
[Prior art]
There are various methods as an intermediate treatment (reduction amount) method for organic waste as described above, but in most methods such as incineration and melting, an exhaust gas treatment process is required to satisfy legal regulation values. In recent years, running costs related to exhaust gas treatment have increased due to regulations on emission of dioxins in addition to regulations on sulfur oxides, nitrogen oxides, hydrogen chloride, and the like in exhaust gases. In addition, due to regulations at the final disposal site, running costs in the ash treatment process are also increasing.
[0003]
As an example of the prior art for satisfying the regulation value of dioxins, the dioxins in the exhaust gas are adsorbed on activated carbon and collected in a dust collection facility together with the solid dioxins. Chemicals used as adsorbents are generally expensive, and enormous energy (calorie) is required for melting and dechlorination. Become.
[0004]
As other prior art,
1. Activated carbide produced from waste such as sewage sludge is introduced into the bag filter type dioxin removal device from outside the system as an adsorbent to remove dioxins contained in the exhaust gas generated from the waste incineration plant. It has been proposed to adsorb and remove dioxins (see, for example, Patent Document 1).
[0005]
2. A dedicated decomposing unit that decomposes dioxins contained in solids such as residue (char) and fly ash (fly ash) discharged from the plastic waste gasifier with the gasification of the waste. Providing continuously in a gasifier is proposed (for example, refer to patent documents 2).
[0006]
3. When combusting general waste and industrial waste in an incinerator, an apparatus has been proposed in which sewage sludge is dispersed and charged and mixed and incinerated (see, for example, Patent Documents 3 and 4).
[0007]
[Patent Document 1]
JP-A-11-193387 (paragraph numbers 0007 and 0009, FIG. 2)
[Patent Document 2]
JP 2000-126716 A (paragraph numbers 0011 and 0012, FIG. 1)
[Patent Document 3]
JP 2000-220815 (paragraph numbers 0015, 0019, 0028, FIG. 1)
[Patent Document 4]
Japanese Patent Application Laid-Open No. 11-257639 (paragraph numbers 0006 to 0008, FIG. 1)
[0008]
[Problems to be solved by the invention]
However, the conventional techniques described in the above publications have the following problems. That is,
1. In the technique of Patent Document 1, since the adsorbent for removing dioxins is procured from outside the system and used, the running cost is high.
[0009]
2. Since the technology of Patent Document 2 collects and decomposes solid matter such as fly ash containing dioxins and processes it, there is no problem of secondary pollution, but the solid matter cannot be used effectively. .
[0010]
3. According to each technique of Patent Documents 3 and 4, there is an advantage that sewage sludge can be mixed and incinerated with general waste, etc., but since sewage sludge is mixed, the temperature of the combustion apparatus may be lowered and unstable. Also, sewage sludge cannot be used effectively.
[0011]
The present invention has been made in view of the above points, and is provided with a means capable of carbonizing and activating organic waste in a waste incineration processing system so that activated carbide can be produced in the system for effective use. An object of the present invention is to provide a waste treatment method and a treatment system capable of removing dioxins using the same means.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the waste treatment method according to the present invention partially burns waste, separates unburned gas and unburned solids generated at this time with a cyclone , After recombusting and recovering heat with a heat exchange means such as a boiler, it is treated with an exhaust gas treatment means and released into the atmosphere, while the unburned solid is mixed with sewage sludge and contained therein Along with dioxins, carbonization is activated and carbonized in a reducing atmosphere by carbonization and activation means (carbonization means incorporating an activation treatment means after the carbonization treatment). dioxins particles were collected to produce an active carbide having a diameter) that can be adsorbed if dioxin was charged to the upstream side of the dust collector of said exhaust gas treatment means the activity carbide dioxin adsorbent After collecting the dioxin adsorbent that adsorbs dioxins and fly ash with the dust collector, the dioxin adsorbent and fly ash are circulated through the carbonization and activation means, and carbonized and activated to regenerate the activated carbide. It is characterized by doing.
[0013]
According to the waste treatment method having the above-described configuration, the waste can be reduced, and the unburned gas generated at the time of reduction is recombusted and the latent heat is transferred through the heat exchange means using the thermal energy. In addition to being able to recover, unburned solids (unburned char) generated at the same time can be removed by pyrolysis together with dioxins contained in the reducing atmosphere, and the unburned solids are carbonized and activated (mainly The carbon (C) content on the carbide surface is reacted with the water (H ₂ O) content of the introduced water vapor to generate carbon dioxide) to produce an activated carbide having a large number of pores on the carbide surface. be able to. As will be described later, this activated carbide can be used as a dioxin adsorbent and auxiliary material, so that it is not wasted.
[0014]
In addition, since sewage sludge is mixed with an unburned solid and carbonized, even if the unburned solid contains a tar content, the tar content adheres to and clogs the inlet to the carbonization / activation means. Is prevented. This is because the tar content is also mixed with the sewage sludge by mixing the sewage sludge and its dehydrated cake with the unburned solid. In addition, sewage sludge is generally composed of uniform fine particles, is rich in carbon, and has a high moisture content, so it is uniformly mixed with unburned solids and carbonized and activated. Since water vapor is generated when heated at, there is no need to introduce water vapor for activation treatment from the outside, and many carbon pores of a size suitable for adsorption of dioxins are obtained by activating the surface of the carbide after carbonization Activated carbides on the surface can be generated.
[0015]
Furthermore, by introducing activated carbide produced in the system into the exhaust gas treatment means, dioxins contained in the exhaust gas after reburning the unburned gas can be adsorbed and removed, and further dioxins can be removed by a dust collector downstream. After collecting the activated charcoal and fly ash that have been adsorbed, they are put back into the carbonization / activation means, and dioxins adsorbed or contained in the active carbide and fly ash are removed by thermal decomposition in a reducing atmosphere. Further, by activating the activated carbide, the activated carbide having a large number of pores on the surface can be regenerated and reused .
[0018]
As described in claim 2 , a part of the unburned solid is thermally decomposed in a reducing atmosphere together with dioxins by carbonization / activation means, and activated to have a large number of pores on the surface by activation treatment. The remainder of the unburned solid can be collected into the melting means together with the activated carbide as the auxiliary combusting material, heated and melted at a high temperature and recovered as molten slag.
[0019]
According to the waste treatment method of claim 2, as described above, a part of the unburned solid is carbonized at the same time as pyrolyzing and removing dioxins, and further activated to produce activated carbide, and the rest Unburned solids are put into a melting means and melted and solidified molten slag is taken out and used for road aggregates.
[0022]
The waste treatment system according to claim 3 is a partial combustion furnace that partially burns waste, a cyclone that separates unburned gas and unburned solids generated during partial combustion, and a reburn that reburns unburned gas. A combustion furnace, a heat exchange means such as a boiler for recovering heat generated at the time of re-combustion, and an exhaust gas treatment means for processing exhaust gas generated after re-combustion and releasing it into the atmosphere, and unburned at the lower end of the cyclone. Under the solids outlet, the unburned solid dioxins are thermally decomposed in a reducing atmosphere, and the unburned solid is carbonized and activated to generate activated carbides with numerous pores on the surface. Carbonization / activation furnace (carbonization / activation furnace is a carbonization furnace that incorporates an activation process after the carbonization process), and when the unburned solid is put into the carbonization / activation furnace, sewage sludge is mixed. Configured to A melting furnace is provided together with the carbonization / activation furnace, and the activated carbide generated by the carbonization / activation furnace is introduced as a dioxin adsorbent to the upstream side of the dust collector of the exhaust gas treatment means to adsorb dioxins. The adsorbed dioxin adsorbent and fly ash are collected by the dust collector and then circulated to the carbonization / activation furnace, and the activated carbide is regenerated by carbonization activation treatment .
[0023]
According to the waste treatment system according to claim 3, the treatment method according to claim 1 can be carried out, and as a result, the unburned gas generated when the waste is partially burned is reburned and generated at that time. The amount of heat can be recovered by heat exchange means. In addition, unburned solids generated at the same time and collected by the cyclone are removed by pyrolyzing dioxins in a carbonization / activation furnace and simultaneously carbonized to become carbides. Then, the surface of the carbide is activated with water vapor or the like, and an activated carbide having a large number of pores on the surface is generated. This activity carbide, as an adsorbent adsorbing dioxins in exhaust gas, and may be utilized in the system as a combustion improver.
[0025]
Also, there is a risk that tar adheres to the insertion path of the carbonization and activation furnace when turning on the non燃固form was separated in a cyclone to carbonization and activation furnace, as dioxin adsorbent collected in dust collector Since activated charcoal and fly ash are introduced, tar content adheres to them and is prevented from adhering to or blocking the charging path.
[0028]
As described in claim 4 , a melting furnace is provided together with the carbonization / activation furnace, and a part of the unburned solid separated by the cyclone is pyrolyzed in a reducing atmosphere in the carbonization / activation furnace together with the dioxins. Carbonized and activated to produce activated carbide having a large number of pores on the surface, and the remainder of the unburned solid is put into the melting furnace together with the activated carbide as a combustion aid and recovered as molten slag It is characterized by doing so.
[0029]
According to the waste treatment system of the fourth aspect, the treatment method according to the second aspect can be implemented, and the same action as the above-described action of the treatment method of the second aspect can be achieved.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a waste treatment method and a waste treatment system according to the present invention will be described with reference to the drawings.
[0031]
FIG. 1A is a schematic configuration diagram showing the waste treatment system according to the first embodiment, and FIG. 1B is a flowchart showing the waste treatment system of FIG. 1A systematically.
[0032]
As shown in FIG. 1, the treatment system 1 of this embodiment includes a fluidized bed partial combustion furnace 2, and waste collected in a garbage pit (not shown) or the like is collected by a garbage crane (not shown). The waste x is supplied to the partial combustion furnace 2 from the introduction port 2b by being charged into the charging hopper 3. A fluidized bed is provided in the lower part of the partial combustion furnace 2, and the waste x is thermally decomposed in a low-temperature reducing atmosphere by partial combustion at a low air ratio by air introduced from near the lower surface of the fluidized bed, and unburned gas (heat Decomposed gas) G and unburned solids y are discharged from the upper exhaust port 2b. In addition, since the partial combustion furnace 2 gasifies the waste x by low air ratio combustion, the amount of exhaust gas is reduced, the furnace can be small, and the inside of the furnace is maintained in a low-temperature reducing atmosphere. The contained metals such as iron and aluminum can be taken out from the outlet 2c at the lower end of the partial combustion furnace 2 in an unoxidized state and used as a recycled material.
[0033]
A cyclone 4 is installed downstream of the partial combustion furnace 2, and an exhaust port 2 b of the partial combustion furnace 2 and an upper introduction port 4 a of the cyclone 4 are connected by a duct 15. A recombustion furnace 5 provided with a boiler 6 is installed downstream of the cyclone 4, and an exhaust port 4 b at the upper end of the cyclone 4 and a lower introduction port 5 a of the recombustion furnace 5 are connected by a duct 16. A temperature reduction tower 7 is installed on the downstream side of the boiler 6, and an exhaust port 6 b of the boiler 6 and an introduction port 7 a of the temperature reduction tower 7 are connected by a duct 17.
[0034]
Two bag filters 8 and a bag filter 9 are connected in series by a duct 19 on the downstream side of the temperature reducing tower 7, and the exhaust port 7 b of the temperature reducing tower 7 and the upper inlet 8 a of the bag filter 8 are ducted. 18 is connected. An IDF (attracting blower) 10 and a chimney 11 are installed in this order on the downstream side of the bag filter 9 and connected by ducts 20 and 21, respectively.
[0035]
In the cyclone 4, the unburned gas G introduced from the upper introduction port 4a and the unburned solid material y are separated, and the unburned gas G is discharged from the upper exhaust port 4b, and enters the reburning furnace 5 from the lower introduction port 5a. Sent. On the other hand, the unburned solid material y is sent from the discharge port 4 c at the lower end of the cyclone 4 to the introduction port 12 f of the carbonization / activation furnace 12 through the charging path 13. A rotary valve 13a (see FIG. 2) is interposed in the charging path 13, and the cyclone 4 and the carbonization / activation furnace 12 are shut off together with the material seal made of the unburned solid material y. The tar contained in the unburned solid y is cooled by the cyclone 4 and is easily attached to the surroundings. For this reason, when the carbonization / activation furnace 12 is charged from the charging path 13, it may adhere to the inner wall of the charging path 13, the rotary valve 13 a, etc., and the charging path 13 may be blocked. Since the activated carbide (spent coal) z ′ and the fly ash p, which function as an agent, are returned to the charging path 13, the activated carbide (spent coal) z ′ even if tar is contained in the unburned solid y. Since it is mixed and dispersed in the fly ash p and cooled and solidified, there is no problem.
[0036]
As shown in FIG. 2, the carbonization / activation furnace 12 is provided with a plurality of stages of carbonized tubes 12b in which a screw conveyor 12c is housed in a furnace body 12a, which are connected in series, and the furnace body 12a has a lower burner. A known structure is used in which the combustion gas F generated by 12d flows from the lower side to the upper exhaust port 12e along the longitudinal direction of the carbonized tube 12b. The carbonization / activation furnace 12 having the same structure is described in, for example, Japanese Patent No. 2975011 and Japanese Patent No. 3055686. While the unburned solid material y is supplied from the inlet 12f of the upper carbonization pipe 12b, is indirectly heated by the combustion gas F, and is sequentially conveyed in the reducing atmosphere to the lower carbonization pipe 12b by the screw conveyor 12c. Is carbonized. A steam supply pipe 12w is connected in the vicinity of the inlet 12f of the carbonization pipe 12b, the water vapor concentration in the carbonization pipe 12b is controlled, and it is suitable for adsorbing a large number of dioxins on the carbide surface in the lower carbonization pipe 12b. It is used for the activation reaction that forms pores with a large diameter (mainly around 50 mm).
[0037]
In this way, an activated carbide z having a large number of pores having an optimum diameter for adsorption of dioxins is generated. The activated carbide z is conveyed by a conveying screw conveyor 12h, taken out from a takeout port 12g provided at the bottom of the carbonization activation furnace 12, and a part thereof is put into a duct 18 on the upstream side of the bag filter 8 as a dioxin adsorbent. Is done. The exhaust port 12e is connected to the downstream portion 6c of the superheater S / H of the boiler 6 through a duct 22, and the exhaust gas H from the carbonization / activation furnace 12 is sent into the boiler low-temperature part 6a. 2 are air supply pipes, the supply pipes 12j are connected to the vicinity of the inlet 12f of the carbonization pipe 12b, and the supply pipes 12k are connected to a plurality of locations on the furnace body 12a.
[0038]
The unburned gas G sent to the reburning furnace 5 reacts with oxygen blown into the reburning furnace 5 and burns completely, and the heat generated by the heat is exchanged by the boiler 6 and recovered. Specifically, the water in the boiler 6 is heated and converted into water vapor. On the other hand, the exhaust gas G ′ after combustion is sent to the temperature reducing tower 7 together with the exhaust gas H from the furnace 12, and a part of the fly ash p generated in the recombustion furnace 5 is separated from the gas component G ′ · H and reduced. It is taken out from the discharge port 7 c at the lower end of the warm tower 7, returned to the charging path 13 of the cyclone 4 by the circulation path 23, and sent to the carbonization / activation furnace 12. The dioxins in the exhaust gas G ′ and the exhaust gas H that have been reduced in temperature by the temperature reducing tower 7 are adsorbed and removed by the dioxin adsorbent (active carbide) z introduced into the duct 18.
[0039]
Of activated carbon (spent coal) z ′ adsorbing exhaust gas G ′, exhaust gas H, fly ash p, and dioxins, fly ash p and activated carbide (spent coal) z ′ are collected by the bag filter 8 and It is taken out from the discharge port 8 c, returned to the charging path 13 for the cyclone 4 through the circulation path 23, and sent to the carbonization / activation furnace 12.
[0040]
On the other hand, the exhaust gas G ′ and the exhaust gas H exhausted from the bag filter 8 are neutralized by contacting with the slaked lime s introduced into the duct 19, and the reaction product q generated by the neutralization reaction is captured by the bag filter 9. Be collected. The reaction product q is taken out from the discharge port 9c at the lower end of the bag filter 9 and discarded. The exhaust gas G ′ / exhaust gas H purified from the exhaust port 9b of the bag filter 9 is attracted by the IDF 10 and released from the chimney 11 into the atmosphere.
[0041]
The activated carbide (spent coal) z ′ adsorbing fly ash p and dioxins returned to the carbonization / activation furnace 12 is thermally decomposed in a reducing atmosphere in the carbonization tube 12b of the carbonization / activation furnace 12. (Heat dechlorination treatment is performed). And the carbide | carbonized_material containing waste carbon z 'is activated, and the activated carbide z is reproduced | regenerated.
[0042]
FIG. 3A is a schematic configuration diagram showing a waste treatment system according to the second embodiment, and FIG. 3B is a flowchart showing the waste treatment system of FIG. 3A systematically.
[0043]
As shown in FIG. 3, the waste treatment system 1 ′ of this embodiment differs from the above embodiment in that a sewage sludge or a dehydrated cake thereof or a dried sludge thereof (hereinafter referred to as a sewage sludge v) is carbonized and activated. That is, the sewage sludge v is introduced directly into the introduction port 12 f of the carbonization / activation furnace 12. Further, since a large amount of water is contained in the sewage sludge v, it is not necessary to supply water vapor near the entrance of the carbonized tube 12c.
[0044]
In addition, since the sewage sludge v has a function as a tar dispersant, particularly when the fly ash p and the spent coal z ′ are not returned to the input path 13 and are not input, the sewage sludge v is input to the input path 13, Tar adhesion must be prevented.
[0045]
According to the waste treatment system 1 ′ of the present embodiment, the sewage sludge v contains a large amount of water because the sewage sludge v is carbonized and activated in the carbonization / activation furnace 12 without being charged into the partial combustion furnace 2. In addition, even when the input amount increases, there is no influence such as destabilizing the combustion of the waste x in the partial combustion furnace 2. Moreover, the activated carbide z can be produced from the sewage sludge v and can be effectively used as a combustion aid in addition to the dioxin adsorbent. Further, there is an advantage that the sewage sludge v can be reduced along with the general waste x. Other configurations and treatment modes are the same as those of the waste treatment system 1 described above, and thus the description thereof is omitted, and common members are denoted by the same reference numerals.
[0046]
FIG. 4 is a flowchart systematically showing the waste treatment system according to the third embodiment.
[0047]
The waste treatment system 1 ″ of the present embodiment is different from the waste treatment system 1 according to the first embodiment described above in that a melting furnace 25 is provided together with the carbonization / activation furnace 12. That is, the waste treatment system 1 ″ is separated by the cyclone 4. An unburned solid material y, fly ash p, and spent charcoal z ′ are burned and melted at a high temperature and recovered as molten slag, for example, a melting furnace 25 is provided to make it usable as road material. 12 and the melting furnace 25 can be appropriately determined according to the needs of the activated carbide z, the molten slag, etc. Also, the waste treatment system 1 ′ of the second embodiment described above. It goes without saying that the sewage sludge v can be put into the carbonization / activation furnace 12 and co-fired with the unburned solids y etc. The specific structure of the melting furnace 25 is shown in the figure. 1 For 00 ° C. is melted in the vicinity of the high temperature, the furnace has deployed the burner and oxygen blowing nozzle.
[0048]
Although three embodiments of the waste treatment system have been described above, the present invention is not limited to these, and can be implemented as follows, for example.
[0049]
In place of the fluidized bed partial combustion furnace 2, when reducing the amount of waste using another type of furnace such as a direct melting furnace, that is, in the recombustion furnace without collecting the unburned solid material y, Even in a system that treats together with the fuel gas, the carbonization / activation furnace 12 described above can be used as a cracking furnace such as a Hagenmeier furnace for the thermal decomposition treatment of dioxins contained in the collected fly ash. In this case, however, the fly ash contains almost no carbon to be carbonized, so that almost no activated carbide can be generated. Therefore, the above-mentioned “sewage sludge v described above in the carbonization / activation furnace 12 as in the second embodiment is charged, and a sufficient amount of activated carbide that can be effectively used as a dioxin adsorbent and an auxiliary combustion material for a direct melting furnace is provided. It is preferable to obtain it.
[0050]
【The invention's effect】
As is apparent from the above description, the waste treatment method and the treatment system of the present invention have the following excellent effects.
[0051]
(1) Since the waste can be treated with this treatment method and treatment system, and at the same time, the adsorbent for removing dioxins can be produced, and the dioxins in the fly ash can be removed by thermal decomposition. It can efficiently handle materials and is excellent in terms of economy and energy saving.
[0052]
(2) Since the carbonization activation furnace can also treat sewage sludge, the entire organic waste can be revived as a valuable material with high added value.
[0053]
(3) It is possible to reduce the amount of sewage sludge without affecting the operation of the main combustion furnace (partial combustion furnace / complete combustion furnace) and also for supplying water necessary for the production of activated carbide.
[0054]
(4) Since the adsorbent for removing dioxins is generated in the system (carbonization activation furnace), the running cost can be suppressed.
[0055]
(5) When putting unburned solids into the carbonization activation furnace from the bottom of the cyclone, return the activated carbide introduced into the exhaust gas treatment means and put it together with unburned solids, or mix sewage sludge with unburned solids Therefore, the tar contained in the unburned solid material is prevented from adhering to the unburned solid material charging path or the charging path is blocked with the tar.
[Brief description of the drawings]
FIG. 1 (a) is a schematic configuration diagram showing a waste treatment system according to a first embodiment of the present invention, and FIG. 1 (b) is a systematic representation of the waste treatment system of FIG. 1 (a). FIG.
FIG. 2 is a cross-sectional view schematically showing an example of the structure of a carbonization / activation furnace constituting a part of the waste treatment system of the present invention.
3A is a schematic configuration diagram showing a waste treatment system according to a second embodiment of the present invention, and FIG. 3B is a systematic representation of the waste treatment system of FIG. 3A. FIG.
FIG. 4 is a flow diagram schematically showing a waste treatment system according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waste treatment system 2 Fluidized bed type partial combustion furnace 3 Input hopper 4 Cyclone 5 Recombustion furnace 6 Boiler 7 Temperature reduction tower 8.9 Bag filter 10 IDF (attraction fan)
11 Chimney 12 Carbonization / activation furnace 13 Input path 15-21 Duct x Waste (garbage)
y Unburned solid (unburned char)
z Activated carbide v Sewage sludge

Claims (4)

Partially combusting waste, separating unburned gas and unburned solids generated at this time with a cyclone , reburning the unburned gas, recovering heat with a heat exchange means such as a boiler, While being processed by the processing means and released into the atmosphere,
The unburned solid material is mixed with sewage sludge and pyrolyzed and carbonized in a reducing atmosphere with carbonization and activation means together with dioxins contained therein, and activated to have a large number of pores on the surface. Produce and recover activated carbides ,
The activated carbide is used as a dioxin adsorbent to the upstream side of the dust collector of the exhaust gas treatment means to adsorb dioxins, and after collecting the dioxin adsorbent adsorbed dioxins and fly ash by the dust collector, A waste treatment method, wherein a dioxin adsorbent and fly ash are circulated in a carbonization / activation means, and the activated carbide is regenerated by carbonization / activation treatment . A part of the unburned solid is mixed with sewage sludge, and together with dioxins contained therein, it is pyrolyzed and carbonized in a reducing atmosphere by a carbonizing / activating means, and activated to activate a large number of fine particles on the surface. Producing and recovering activated carbides with pores;
The remainder of the unburned solid is collected into the melting means together with the activated carbide as a combustion aid, heated and melted at a high temperature, and recovered as molten slag.
The waste treatment method according to claim 1, wherein: A partial combustion furnace that partially burns waste, a cyclone that separates unburned gas and unburned solids generated during partial combustion, a reburning furnace that reburns unburned gas, and heat generated during reburning Heat recovery means such as a boiler to be recovered, and exhaust gas treatment means for treating exhaust gas generated after recombustion and releasing it into the atmosphere,
At the bottom of the cyclone unburned solids, the dioxins in the unburned solids are thermally decomposed in a reducing atmosphere, and the unburned solids are carbonized and activated to activate a large number of pores on the surface. the carbonization and activation furnace to produce an active carbide having provided continuously,
When charging the unburned solid into the carbonization / activation furnace, it is configured to mix and input sewage sludge,
A melting furnace is provided together with the carbonization / activation furnace, and a part of the unburned solid separated by the cyclone is thermally decomposed and carbonized in a reducing atmosphere in the carbonization / activation furnace together with the dioxins, and the surface is subjected to activation treatment. To produce an activated carbide having a large number of pores,
The remainder of the unburned solid is charged into the melting furnace together with the activated carbide as a combustion aid and recovered as molten slag,
Activated carbide generated by the carbonization / activation furnace is used as a dioxin adsorbent to the upstream side of the dust collector of the exhaust gas treatment means to adsorb dioxins and dioxins adsorbed with dioxins and fly ash are collected into the dust collector. After being collected in the above, it is circulated to the carbonization / activation furnace and activated carbonization to regenerate the activated carbide.
A waste treatment system characterized by A melting furnace is provided together with the carbonization / activation furnace, and a part of the unburned solid separated by the cyclone is thermally decomposed and carbonized in a reducing atmosphere in the carbonization / activation furnace together with the dioxins, and the surface is subjected to activation treatment. Activated carbides having a large number of pores are generated, and the remainder of the unburned solids is put into the melting furnace together with the activated carbides as auxiliary combustion materials and recovered as molten slag.
The waste treatment system according to claim 3 .

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