Final disposal waste processing system

Abstract

This system provides a final disposal waste treatment system that can efficiently process final disposal waste by effectively utilizing existing final disposal sites. [Solution] A final disposal waste treatment system comprising a transport device 2 for transporting final disposal waste 1 to a final disposal site or an excavation device 3 for excavating final disposal waste 1 buried in a final disposal site, a heat treatment furnace 4 for heating and reducing the volume of the final disposal waste 1, and a landfill device 5 for burying the residue 10 of the final disposal waste generated in the heat treatment furnace 4 in the final disposal site. According to this system, the volume of final disposal waste 1 can be reduced to less than 1 / 10 on average, and under certain conditions it is possible to reduce the volume to as much as 1 / 400. As a result, final disposal waste can be continuously processed by effectively utilizing existing final disposal sites without constructing new final disposal sites.

Description

Technical Field

[0001] The present invention relates to a treatment system for final disposal waste to be landfill in a final disposal site.

Background Art

[0002] Conventionally, in a bag-breaking device for a garbage pit in a garbage treatment plant that receives garbage collected by a garbage collection vehicle, a bag-breaking device is installed at the garbage input section to the garbage pit by the garbage collection vehicle, and the garbage whose bag has been broken by the bag-breaking device is put into the garbage pit (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to the garbage treatment method described in Patent Document 1, it is possible to drain the moisture sealed in the garbage bag together with the garbage, increase the combustion efficiency, enable continuous and uniform incineration of the garbage, and suppress the generation of harmful substances such as dioxins accompanying the incineration of the garbage.

[0005] Many of the final disposal sites established throughout the country are nearing their waste-holding capacity limits, leading to situations where industrial and general waste are being dumped into vacant lots and the sea. According to the Ministry of the Environment's White Paper on a Circular Economy (FY2021 results), the remaining lifespan of final disposal sites for general waste is 23.4 years, and that of final disposal sites for industrial waste is 17.7 years, making the construction of new waste treatment plants desirable. However, constructing new waste treatment plants would require enormous costs and would be subject to various environmental and other constraints. Furthermore, in response to shortages of oil and naphtha caused by conflicts in oil-producing regions and export restrictions on rare metals by certain countries, the Japanese government is working to enact legislation from November 2025 to ensure a stable supply of recycled materials while reducing greenhouse gas emissions and promoting resource recycling.

[0006] In view of the above-mentioned points, the present invention aims to provide a final disposal waste treatment system that can efficiently treat final disposal waste by effectively utilizing existing final disposal sites. [Means for solving the problem]

[0007] This invention encompasses the following features.

[0008] (1) A final disposal waste treatment system to be installed in a final disposal site, comprising a heat treatment furnace for heating and reducing the volume of the final disposal waste, and a landfill device for burying the residue of the final disposal waste generated in the heat treatment furnace in the final disposal site.

[0009] (2) The final disposal waste treatment system according to (1), wherein a transport device is provided to transport the final disposal waste to the final disposal site, and the final disposal waste transported by the transport device is reduced in volume in the heat treatment furnace.

[0010] (3) A final disposal waste treatment system according to (1), comprising: an excavation device for excavating final disposal waste buried in the final disposal site; and a heat treatment furnace for reducing the volume of the final disposal waste excavated by the excavation device.

[0011] (4) The final disposal system for final disposal waste according to (3), wherein the residue of the final disposal waste whose volume has been reduced in the heat treatment furnace is backfilled into an excavation recess formed in the final disposal site using the landfill device.

[0012] (5) The final disposal waste treatment system according to (1), further comprising an oil recovery unit that liquefies and recovers oil vaporized by heating the final disposal waste in the heat treatment furnace.

[0013] (6) The final disposal waste treatment system according to (1), further comprising a metal recovery unit that recovers metal components that have become molten when the final disposal waste is heated in the heat treatment furnace by dripping them down.

[0014] (7) The final disposal waste treatment system described in (3), wherein the final disposal site is a stable final disposal site where stable waste is buried.

[0015] (8) The final disposal waste treatment system according to (3), wherein the final disposal site is a controlled final disposal site where controlled waste is buried, or a containment final disposal site where containment waste containing hazardous substances is buried, and the system is equipped with a repair means for repairing the barrier layer of the final disposal site from which the final disposal waste has been excavated by the excavation device. [Effects of the Invention]

[0016] According to the final disposal waste treatment system of the present invention described above, final disposal waste transported by a transport device or excavated by an excavation device is brought into a heat treatment furnace and heated. This vaporizes hydrocarbon components such as waste plastics in the final disposal waste, as well as moisture contained in food waste and sludge, and releases them outside the heat treatment furnace. In addition, metal materials in the final disposal waste are melted and dripped outside the heat treatment furnace. As a result, the volume of final disposal waste is reduced on average to 1 / 10 or less, and under certain conditions, it is possible to reduce the volume to as much as 1 / 400. As a result, final disposal waste can be continuously treated by effectively utilizing existing final disposal sites without constructing new final disposal sites. [Brief explanation of the drawing]

[0017] [Figure 1] A block diagram showing an embodiment of the final disposal waste treatment system according to the present invention. [Figure 2] An explanatory diagram showing the configuration of a heat treatment furnace that reduces the volume of final disposal waste by heating it. [Figure 3] An explanatory diagram showing the configuration of the metal recovery unit that recovers metal materials. [Figure 4] An explanatory diagram showing the processing operations for final disposal waste. [Figure 5] A cross-sectional view showing the state of a final disposal site after the final disposal waste has been excavated. [Modes for carrying out the invention]

[0018] Next, embodiments of the present invention will be described in detail based on the accompanying drawings. FIG. 1 is a block diagram showing a typical embodiment of a final disposal waste treatment system according to the present invention. The final disposal waste treatment system according to this embodiment includes a transport device 2 such as a dump truck or a forklift for transporting final disposal waste 1 such as household waste or industrial waste carried out from a household or a factory, etc., an excavation device 3 such as an excavator for excavating the final disposal waste 1 buried in the final disposal site, a heat treatment furnace 4 for heating the final disposal waste 1 transported to the transport device 2 or the final disposal waste 1 excavated by the excavation device 3 to reduce its volume, and an embankment device 5 such as a bulldozer for filling the residue 10 of the final disposal waste carried out from the heat treatment furnace 4 into the final disposal site.

[0019] The heat treatment furnace 4 is provided with an oil recovery unit 6 for liquefying and recovering the oil vaporized when the final disposal waste 1 is heated in the heat treatment furnace 4 and utilizing this as fuel or naphtha, etc., and a metal recovery unit 7 for dropping and recovering the molten metal material when the final disposal waste 1 is heated and utilizing this as recycled resources.

[0020] As shown in FIG. 2, the heat treatment furnace 4 has a treatment furnace structure body 40 having a substantially rectangular cross-sectional shape for both the floor wall surface of its installation part, and openings that are opened and closed by end shutters 4a and 4b are provided at both ends in its length direction. Then, by driving the end shutters 4a and 4b to move up and down by an opening and closing cylinder (not shown), the both-end openings of the treatment furnace structure body 40 are opened to carry in and out the waste storage container 9 via the transfer conveyors 9a and 9b, and it is configured to be displaceable between a state where the both-end openings of the treatment furnace structure body 40 are closed in an airtight state.

[0021] Further, the interior of the processing furnace structure 40 is partitioned into the first processing chamber 41 to the seventh processing chamber 47 by partition shutters 4c to 4i. Then, by driving the partition shutters 4c to 4i up and down with an opening / closing cylinder (not shown), the first processing chamber 41 to the seventh processing chamber 47 can be displaced between an airtight state where they are individually partitioned and a communicating state where the garbage storage container 9 conveyed by the transfer conveyors 9c to 9i can be moved from the upstream processing chamber to the downstream processing chamber.

[0022] In the first processing chamber 41 to the fourth processing chamber 44 of the processing furnace structure 40, superheated steam supply devices 8a to 8d for supplying superheated steam at a predetermined temperature to the interior are connected. The superheated steam supply devices 8a to 8d include a boiler 81 that heats water to generate steam, a superheated steam generation unit 82 that heats the steam generated by the boiler 81 to generate superheated steam having a temperature of, for example, about 150°C to 1000°C, and a supply pipe 83 that supplies the superheated steam at a predetermined temperature generated by the superheated steam generation unit 82 into the first processing chamber 41 to the fourth processing chamber 44. <00??099> Then, when superheated steam of about 150°C is supplied from the supply pipe 83 of the heating steam supply device 8a into the first processing chamber 41, low-melting-point waste plastic materials made of, for example, acrylic and nylon in the final disposal waste 1 are heated to generate vapor gas, and the vapor gas is liquefied and recovered by the oil recovery unit 6a and reused as kerosene or the like. Also, when superheated steam of about 300°C is supplied from the supply pipe 83 of the heating steam supply device 8b into the second processing chamber 42, various waste plastic materials such as ABS, PP, and PC or waste tires in the final disposal waste 1 are heated to generate vapor gas, and the vapor gas is liquefied and recovered by the oil recovery unit 6b and reused as light oil or naphtha or the like.

[0024] Furthermore, by supplying superheated steam at approximately 450°C from the supply pipe 83 of the heating steam supply device 8c into the third processing chamber 43, high-melting-point waste plastic materials such as PEEK (polyether ether ketone) in the final disposal waste 1 are heated, generating vaporized gas. This vaporized gas is then liquefied and recovered by the oil recovery unit 6c and reused as heavy oil, etc. In addition, by supplying superheated steam at approximately 600°C from the supply pipe 83 of the heating steam supply device 8d into the fourth processing chamber 44, flame-retardant waste plastic materials in the final disposal waste 1 are heated, generating vaporized gas. This vaporized gas is then recovered by the oil recovery unit 6d as asphaltene, etc.

[0025] Various metal materials, such as tin, lead, lithium, magnesium, zirconium, gold, silver, copper, and neodymium, contained in the final disposal waste 1 transported by the transport conveyors 9a to 9i, are heated to a predetermined temperature in the first to fourth processing chambers 41 to 44. As a result, they fall through small holes (not shown) formed at the bottom of the waste container 9 onto a metal recovery section 7, which consists of recovery containers etc., arranged between a pair of left and right conveyor belts 90 constituting the transport conveyors 9c to 9f, as shown in Figure 3, and are recovered as recycled resources.

[0026] The fifth to seventh processing chambers 46 to 47, located downstream of the fourth processing chamber 44, are configured to gradually lower the temperature inside them before transporting the waste container 9 outside the heating furnace 4. For example, by sequentially introducing outside air into the fifth to seventh processing chambers 46 to 47, the temperature inside the fifth processing chamber 45 is lowered to about 400°C, then the temperature inside the sixth processing chamber 46 is lowered to about 150°C, and then the temperature inside the seventh processing chamber 47 is lowered to about 60°C. As a result, it is prevented that the processing chambers 46 to 47 containing the waste container 9 will not deteriorate due to rapid temperature changes, and that high-temperature residue 10 will not be transported outside the heating furnace 4.

[0027] The residue 10 that is exposed outside the heat treatment furnace 4 is appropriately separated into useful materials such as carbonized material that can be used as fuel and building materials used in road construction, and unwanted residue that has no value. Only the unwanted residue is then buried in the final disposal site by the landfill device 5.

[0028] As described above, the final disposal waste treatment system according to the present invention comprises a transport device 2 for transporting final disposal waste 1 to a final disposal site, a heat treatment furnace 4 for heating and reducing the volume of the final disposal waste 1 transported by the transport device 2, and a landfill device for burying the final disposal waste residue 10 generated in the heat treatment furnace 4 at the final disposal site. Therefore, it has the advantage of being able to efficiently process final disposal waste 1 by effectively utilizing existing final waste treatment facilities.

[0029] In other words, as shown in Figure 4, final disposal waste appropriately sorted at the intermediate waste disposal site A, and final disposal waste excavated from the final disposal site, are transported to the oil and carbonization apparatus B equipped with a heat treatment furnace 4. Superheated steam at a predetermined temperature supplied from superheated steam supply devices 8a to 8d into each treatment chamber 41 to 44 vaporizes hydrocarbon components such as waste plastics and moisture contained in food waste in the final disposal waste 1, and is discharged outside the heat treatment furnace 4. At the same time, the waste is classified and recovered in the oil recovery section 6 and the metal recovery section 7, etc., into oil / recycled (naphtha) C, metal / copper / aluminum D, and charcoal / activated carbon E, etc., and after being reduced in volume to, for example, 1 / 10 or less, only the unnecessary residue F is buried in the empty space G of the final disposal site.

[0030] Therefore, existing final disposal sites can be effectively utilized, allowing for the continued processing of final disposal waste without constructing new final disposal sites. Furthermore, it effectively prevents the release of harmful dioxins and methane gas, which contributes to global warming, into the atmosphere, and enables the effective use of limited resources and monetization by recovering useful components.

[0031] Furthermore, in the above-described embodiment, by closing the end shutters 4a, 4b and partition shutters 4c to 4i provided on the heat treatment furnace 4 to seal each treatment chamber 41 to 47, and supplying heating steam from the heating steam supply device into each treatment chamber 41 to 44, each treatment chamber 41 to 44 is configured to be in an oxygen-free state during the heating and volume reduction work of the final disposal waste 1. As a result, various types of final disposal waste 1, including lithium-ion batteries containing easily ignitable electrolytes, solar panels that are difficult to decompose, and sludge with a high water content that is difficult to reduce in volume, can be properly treated in the heat treatment furnace 4, and the final disposal waste 1 can be efficiently reduced in volume while preventing fires or explosions from occurring, and preventing toxic components or greenhouse gases from leaking to the outside.

[0032] Furthermore, in the above-described embodiment, the superheated steam supplied from the superheated steam supply devices 8a to 8d to each processing chamber 41 to 44 is configured to have different temperatures. This has the advantage that the oil recovered by the oil recovery units 6a to 6d and the metal components recovered by the metal recovery unit 7, which are provided in each processing chamber 41 to 44, can be properly separated according to their temperature characteristics.

[0033] Furthermore, by excavating the final disposal waste 1 buried in the final disposal site using an excavation device 3 consisting of an excavator, etc., and transporting it to a heat treatment furnace 4 for heating, it is possible to reduce the volume of the final disposal waste 1 mixed with soil and sand to about one-third. Then, by separating the residue 10 removed from the heat treatment furnace 4 into useful materials and unwanted residues, and backfilling the unusable residues into the excavation depressions formed in the final disposal site by the excavation device 3 using a landfill device 5, it is possible to extend the life of a final disposal site that is approaching its waste storage capacity limit, and to continue processing the final disposal waste 1 at existing final disposal sites.

[0034] Furthermore, there are various types of final waste disposal sites: stable landfills for burying waste plastics, metal scraps, glass, concrete scraps, rubble, etc.; controlled landfills equipped with a barrier layer made of waterproof sheets, etc., to prevent sludge, etc., from flowing out with rainwater; and containment landfills equipped with a barrier layer made of covers, reinforced concrete walls, etc., to completely isolate containment waste containing hazardous substances. The waste treatment system according to the present invention can be used in any type of final waste disposal site, but it is desirable to install the waste treatment system according to the present invention in a stable landfill where it is possible to safely excavate the final waste 1 buried in the final waste disposal site.

[0035] On the other hand, the barrier layers, such as the impermeable sheets in controlled landfills and the reinforced concrete walls in containment landfills, need to be inspected and repaired as appropriate. For this reason, the final disposal waste 1 buried in the final disposal site partitioned by the barrier layer 11 is excavated using an excavation device 3 and transported to a heat treatment furnace 4 for heating and volume reduction. Then, as shown in Figure 5, with the barrier layer 11 of the final disposal site exposed by excavating the final disposal waste 1, it is desirable to inspect for cracks 12, etc., and to repair the cracks 12, etc., using repair means such as a repair agent spraying device.

[0036] Although embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, instead of a continuous heating furnace 4 having multiple processing chambers 41 to 47 as shown in Figure 2, an independent heating furnace having a single processing chamber may be provided. In this case, the final disposal waste processing system according to the present invention can be mounted on a transport vehicle such as a truck and transported sequentially to multiple final disposal sites for processing. [Explanation of symbols]

[0037] 1. Final disposal waste 2. Conveying device 3. Excavation device 4. Heat treatment furnace 5 Landfill equipment 6. Oil Recovery Section 7. Metal Recycling Department 8a~8d Superheated steam supply system 9. Garbage container 10 Residue 41-47 Processing Rooms

Claims

1. A waste disposal system installed at a final disposal site, A heat treatment furnace for reducing the volume of the aforementioned final disposal waste by heating it, A final disposal waste treatment system comprising a landfill device for burying the residue of the final disposal waste generated in the heat treatment furnace in the final disposal site.

2. A final disposal waste treatment system according to claim 1, comprising: a transport device for transporting final disposal waste to the final disposal site; and a heat treatment furnace for reducing the volume of the final disposal waste transported by the transport device.

3. A final disposal waste treatment system according to claim 1, comprising: an excavation device for excavating final disposal waste buried in the final disposal site; and a heat treatment furnace for reducing the volume of the final disposal waste excavated by the excavation device.

4. The final disposal system for final disposal waste according to claim 3, wherein the residue of the final disposal waste whose volume has been reduced in the heat treatment furnace is backfilled into an excavation recess formed in the final disposal site using the landfill device.

5. The final disposal waste treatment system according to claim 1, further comprising an oil recovery unit that liquefies and recovers oil vaporized by heating the final disposal waste in the heat treatment furnace.

6. The final disposal waste treatment system according to claim 1, further comprising a metal recovery unit that recovers metal components that have become molten when the final disposal waste is heated in the heat treatment furnace by dripping them down.

7. The final disposal waste treatment system according to claim 3, wherein the final disposal site is a stable final disposal site where stable waste is buried.

8. The final disposal waste treatment system according to claim 3, wherein the final disposal site is a controlled final disposal site where controlled waste is buried, or a containment final disposal site where containment waste containing hazardous substances is buried, and the system includes a repair means for repairing the barrier layer of the final disposal site from which the final disposal waste has been excavated by the excavation device.

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