Waste disposal site, soil-covering material of waste disposal site, and method for manufacturing soil-covering material

Abstract

To provide a waste disposal site which can contribute to achieve carbon neutral, a soil-covering material which is used in the waste disposal site, and a method for manufacturing a soil-covering material.SOLUTION: There is provided a waste disposal site 10 in which a waste is accumulated in a disposal region, wherein a carbon-containing material containing carbon is used in soil-covering layers 11, 12 and 13 covering wastes 1, 2 and 3 in a disposal region 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waste disposal site, a cover material for use at a waste disposal site, and a method for producing the cover material. [Background technology]

[0002] Toward the realization of a carbon-neutral society, efforts to become carbon-neutral are being sought even at final waste disposal sites where waste is finally disposed of by landfill. For example, one measure at final waste disposal sites is the adoption of semi-aerobic landfill structures (Non-Patent Document 1).

[0003] Patent Document 1 proposes a method of fixing CO2 at a waste disposal site by supplying CO2-containing gas to a waste layer such as incineration ash. Patent Document 2 proposes a method of fixing carbon dioxide at a sea surface disposal site in which, after the waste has been buried at the sea surface disposal site, a pumping well is installed on the landfill, interstitial water that has seeped from the landfill is pumped up to the bottom of the pumping well, carbon dioxide is absorbed into the pumped water, and the treated water is then returned to the landfill site from a location separate from the pumping well (paragraph

[0013] ). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-166504 [Patent Document 2] Japanese Patent Publication No. 2022-136725 [Patent Document 3] Japanese Patent Application Publication No. 11-216440 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-260430 [Non-patent literature]

[0005] [Non-Patent Document 1] "Decarbonization Measures in the Waste Sector Towards Carbon Neutrality by 2050," April 6, 2021, Ministry of the Environment, Environmental Regeneration and Resource Recycling Bureau, https: / / www.env.go.jp / council / 03recycle / council / 03recycle / y030-37-s1-1.pdf Summary of the Invention [Problem to be solved by the invention]

[0006] The above-mentioned conventional technologies are still insufficient to achieve carbon neutrality at final waste disposal sites, and further efforts are needed. For example, at managed final waste disposal sites, intermediate and final soil covering is carried out to prevent waste from scattering and odors, and it is possible to utilize these aspects.

[0007] In view of the problems of the conventional technology as described above, the present invention aims to provide a waste disposal site, a cover soil material to be used at a waste disposal site, and a method for manufacturing a cover soil material that can contribute to achieving carbon neutrality. [Means for solving the problem]

[0008] A waste disposal site for achieving the above-mentioned objective is a waste disposal site in which waste is deposited in a disposal area, and a carbon-containing material containing carbon is used as a cover layer covering the waste in the disposal area.

[0009] According to this waste disposal site, a carbon-containing material containing carbon is used in the cover layer that covers the waste piled up within the disposal area of ​​the waste disposal site, which can contribute to achieving carbon neutrality.

[0010] In the waste disposal site, the carbon-containing material is preferably one that contains carbon by adsorbing and fixing carbon dioxide to an alkaline material.

[0011] The carbon-containing material is preferably an alkaline material capable of containing carbon by fixing carbon dioxide in the atmosphere and / or generated from the deposits over the medium to long term. In this case, the alkaline material preferably has a particle size of 40 mm or less, which increases the CO2 fixation efficiency.

[0012] In addition, the carbon-containing material is preferably one that contains carbon by mixing an inorganic carbon-containing material with a covering material. In this case, the mixing amount of the inorganic carbon-containing material with respect to the covering material is 50 to 300 kg / m. 3 It is also preferable to use, as the soil covering material, at least one of soil and sand, an alkaline material that contains carbon by adsorbing and fixing carbon dioxide, and an alkaline material that can contain carbon by fixing carbon dioxide over the medium to long term.

[0013] The carbon-containing material may further comprise carbon. 3 It is preferable that the container contains or is capable of containing at least 3.6 kg per container.

[0014] It is also preferable that the carbon-containing material be used in either or both of an intermediate cover layer that covers the waste and on which further waste is deposited, and a final cover layer that covers the waste but on which no more waste is deposited.

[0015] It is also preferable that the final covering soil layer contains a solidifying material mixed therein to prevent the covering soil from scattering.

[0016] Furthermore, it is preferable to use, as the carbon-containing material, one, two, or all of the following for the intermediate cover layer and / or the final cover layer: a material that contains carbon by adsorbing and fixing carbon dioxide in an alkaline material; an alkaline material that can contain carbon by fixing carbon dioxide in the medium to long term; and a material that contains carbon by mixing an inorganic carbon-containing substance into a cover material.

[0017] The alkaline material is preferably recycled aggregate, slag, cement-containing soil, or modified soil.

[0018] The cover soil material for a waste disposal site for achieving the above-mentioned object is made primarily from the carbon-containing material used in the cover soil layer at the above-mentioned waste disposal site.

[0019] This cover soil material for waste disposal sites is made primarily from carbon-containing materials, which can contribute to achieving carbon neutrality.

[0020] To achieve the above-mentioned objective, a method for producing a cover soil material for a waste disposal site is a method for producing a cover soil material for a waste disposal site, the main raw material of which is a carbon-containing material that contains carbon by adsorbing and fixing carbon dioxide in an alkaline material, and is used as the cover soil layer at the above-mentioned waste disposal site, and the carbon-containing material is produced by supplying carbon dioxide to the alkaline material and fixing the carbon dioxide.

[0021] This method for producing cover soil material for waste disposal sites makes it possible to produce cover soil material whose main raw material is a carbon-containing material that fixes carbon dioxide and contains carbon, thereby contributing to the realization of carbon neutrality.

[0022] Another method for manufacturing a cover soil material for a waste disposal site to achieve the above-mentioned object is a method for manufacturing a cover soil material for a waste disposal site whose main raw material is a carbon-containing material that can contain carbon by fixing carbon dioxide in an alkaline material over the medium to long term, and which is used as the cover soil layer at the above-mentioned waste disposal site.When the alkaline material is cement-containing soil or modified soil, cement or a modifying material is added to the raw soil such as mud, and a mixing granulation process or a loosening granulation process after solidification is carried out to make it into a granular form.

[0023] This method for producing cover soil material for waste disposal sites allows the production of cover soil material that fixes carbon dioxide and is made primarily from a carbon-containing material in the form of granules containing carbon, which forms voids between the cover soil material. Carbon dioxide is supplied to these voids, increasing the CO2 fixation efficiency of the cover soil material and contributing to the realization of carbon neutrality. [Effects of the Invention]

[0024] According to the present invention, it is possible to provide a waste disposal site, a cover soil material to be used at a waste disposal site, and a method for manufacturing a cover soil material that can contribute to achieving carbon neutrality. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a longitudinal cross-sectional view schematically showing the internal configuration of a waste disposal site according to an embodiment of the present invention. [Figure 2] 10 is a diagram showing a method for fixing CO2 by supplying a CO2-containing gas to an alkaline material in a reservoir to produce a first carbon-containing material of the present embodiment. FIG. [Figure 3] FIG. 10 is a diagram showing a method for fixing CO2 by supplying a CO2-containing gas to an alkaline material in a container to produce a first carbon-containing material. [Figure 4] FIG. 10 is a diagram showing a method for fixing CO2 by supplying CO2 gas generated from dry ice to an alkaline material in a container to produce a first carbon-containing material. [Figure 5] FIG. 1 is a diagram showing a method for fixing atmospheric CO2 by laying a thin layer of alkaline material to produce a first carbon-containing material. DETAILED DESCRIPTION OF THE INVENTION

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a vertical cross-sectional view schematically showing the internal structure of a waste disposal site according to this embodiment.

[0027] As shown in Figure 1, the waste disposal site 10 of this embodiment has a concave disposal area 10a with an inverted trapezoidal cross section to form a recess for waste disposal. The sediment layer 1, formed by waste being dumped and deposited at the bottom of the disposal area 10a, is covered with an intermediate cover soil layer 11. The sediment layer 2, formed by waste being dumped and deposited on the intermediate cover soil layer 11, is covered with a next intermediate cover soil layer 12. The sediment layer 3, formed by waste being dumped and deposited on the intermediate cover soil layer 12, is covered with a final cover soil layer 13. The intermediate cover soil layers 11, 12, and final cover soil layer 13 are each compacted using construction machinery after cover soil materials are dumped on top of the sediment layers. The thickness of each of the intermediate cover soil layers 11, 12, and final cover soil layer 13 is approximately 50 cm.

[0028] In a waste disposal site 10 such as that shown in Figure 1, specifically, for example, a waterproof sheet is installed on the slope and bottom of the concave disposal area 10a, protective soil is placed on top of the waterproof sheet, a groundwater collection and drainage pipe is installed under the waterproof layer on the bottom, a leachate collection and drainage pipe is installed on top of the protective soil on the bottom, and a leak detection system is installed on the waterproof sheet.

[0029] The waste disposal site 10 shown in Figure 1 uses a cover material whose main ingredient is a carbon-containing material for one, two, or all of the intermediate cover layers 11, 12, and the final cover layer 13. There are three types of such carbon-containing materials:

[0030] The first carbon-containing material is a material that contains carbon by adsorbing and fixing CO2 to alkaline materials such as recycled aggregate, slag, cement-containing soil, and modified soil.

[0031] The second carbon-containing material is an alkaline material capable of containing carbon, such as recycled aggregate, slag, cement-containing soil, or modified soil. These alkaline materials are used to fix atmospheric CO2 and / or CO2 generated from at least one of the sediment layers 1, 2, and 3 shown in Figure 1 in the waste disposal site 10 over the medium to long term. For example, if the waste disposal site 10 is a site with a high organic content or a site that accepts food waste, CO2 generated from the waste layers 1, 2, and 3 as the organic matter decomposes can be fixed in the intermediate cover soil layers 11, 12, and final cover soil layer 13. Furthermore, atmospheric CO2 can be absorbed and fixed in the intermediate cover soil layers 11, 12, and final cover soil layer 13. This fixation of atmospheric CO2 is known as direct air capture (DAC), a technology that directly captures CO2 from the atmosphere.

[0032] In the first and second carbon-containing materials, the recycled aggregate is composed of raw aggregate obtained from concrete blocks and cement. The slag is, for example, steelmaking slag or iron and steel slag. The cement-containing soil is soil mixed with cement. The improved soil is, for example, calcia improved soil in which steelmaking slag is mixed with dredged soil, or improved soil in which a PS ash-based improver is mixed with muddy soil such as dredged soil or construction sludge. The amount of steelmaking slag mixed in calcia improved soil is 250 to 1200 kg / m 3 The amount of PS ash-based modifier mixed in the modified soil is preferably 50 to 300 kg / m 3 is preferred.

[0033] The third type of carbon-containing material is a material that contains carbon by mixing inorganic carbon-containing materials such as biochar or calcium carbonate into the cover material. The amount of inorganic carbon-containing material mixed into the cover material is 50 to 300 kg / m. 3 Furthermore, as the covering material, soil and sand, the first and second carbon-containing materials can be used, and any one, any two, or all of these can be used.

[0034] In the first and second carbon-containing materials, CO2 is fixed as calcium carbonate (CaCO3) through the following reaction between calcium in the alkaline material and CO2. CaO + HO → Ca(OH) Ca(OH)2+ CO2 → CaCO3+ H2O

[0035] The first to third carbon-containing materials are preferred as the main raw materials of the cover soil material for the intermediate cover soil layers 11, 12 and the final cover soil layer 13 of the waste disposal site 10 in Figure 1, and can be used in appropriate combination as the intermediate cover soil layers 11, 12 and the final cover soil layer 13.

[0036] If, after intermediate covering with intermediate cover layers 11 and 12 in Figure 1, the time until the next waste is input is short and the time required for CO2 fixation by DAC or the like cannot be secured, or if there is little organic matter in the waste, it is preferable to use a cover material whose main ingredient is the first or third carbon-containing material for intermediate cover layers 11 and 12.

[0037] If the waste disposal site has a semi-aerobic landfill structure and contains a large amount of organic waste or accepts food waste, CO2 is generated by the aerobic decomposition of organic matter. Therefore, if a cover soil material whose main ingredient is the second carbon-containing material is used, the CO2 fixation process during the production of the first carbon-containing material can be omitted.

[0038] Furthermore, as a combination of the first to third carbon-containing materials, it is preferable to use, for example, a cover material whose main ingredient is the first or third carbon-containing material for the intermediate cover layers 11 and 12, and a cover material whose main ingredient is the second carbon-containing material for the final cover layer 13, which can ensure contact with the atmosphere over a long period of time.

[0039] As shown in Figure 1, the intermediate cover soil layers 11 and 12 are subsequently filled with waste, and are therefore maintained stably for a long period of time without being scattered or excavated. Furthermore, since the final cover soil layer 13 is in contact with the outside, a solidifying material or the like may be mixed in to prevent the cover soil from scattering.

[0040] According to the waste disposal site of Figure 1, the cover soil layers 11 to 13 covering the waste layers 1 to 3 deposited in the disposal area 10a of the waste disposal site 10 are made of cover soil material whose main ingredient is a carbon-containing material, which makes it possible to easily fix CO2 and store carbon, thereby contributing to the realization of carbon neutrality.

[0041] Next, a CO2 fixation method for producing a first carbon-containing material will be described with reference to Figures 2 to 5. Figure 2 is a diagram showing a method for fixing CO2 by supplying a CO2-containing gas to an alkaline material in a storage unit. In the example of Figure 2, CO2 is fixed to the alkaline material 30 by supplying a CO2-containing gas from a CO2 supply device 31 to the alkaline material 30 in the storage unit 34 through a CO2 supply pipe 32 at the bottom of the storage unit 34.

[0042] Fig. 3 is a diagram showing a method for fixing CO2 by supplying a CO2-containing gas to an alkaline material in a container. In the example of Fig. 3, CO2 is fixed in an alkaline material 30 in a concrete or steel container 35 by supplying a CO2-containing gas from a CO2 supply device 31 through a CO2 supply pipe 32 at the bottom of the container 35.

[0043] As the CO2-containing gas in FIGS. 2 and 3, CO2-containing exhaust gas emitted from an internal combustion engine or a plant, 100% CO2 gas, air, etc. can be used.

[0044] Fig. 4 is a diagram showing a method of immobilizing CO2 by supplying CO2 gas generated from dry ice to alkaline material in a container. In the example of Fig. 4, CO2 is immobilized in alkaline material 30 by supplying CO2 gas generated when dry ice 36, which has been laid in advance at the bottom of container 35, evaporates to alkaline material 30 in a concrete or steel container 35. Note that dry ice 36 may also be mixed with alkaline material 30; for example, dry ice may be added to alkaline material 30 in Fig. 2 and mixed using a backhoe or the like.

[0045] Figure 5 is a diagram showing a method of fixing atmospheric CO2 by laying a thin layer of alkaline material. In the example of Figure 5, alkaline material 30 is laid in a thin layer in a stockyard or the like, and atmospheric CO2 is naturally supplied to alkaline material 30, thereby fixing CO2 in alkaline material 30. Note that the CO2 fixation reaction proceeds on the surface layer of alkaline material 30 in Figure 5, and is thought to not progress sufficiently inside, so it is preferable to turn it over with a backhoe or bulldozer after a predetermined period of time has passed and move the material inside to the surface.

[0046] The first carbon-containing material can be produced using an alkaline material by the methods shown in Figures 2 to 5. When the alkaline material is recycled aggregate or slag, it has a particle size of 40 mm or less, is gravelly and sandy, and may contain fine particles. In the case of cement-containing soil or modified soil, it does not need to be granular when used as a cover soil material, but if the cement-containing soil or modified soil is granular during CO2 fixation, it improves CO2 fixation efficiency. Such cement-containing soil and modified soil can be produced by adding cement or a modifier to mud or the like, and then creating a granular state through a mixing and granulation process or a loosening and granulation process after solidification. Then, CO2 is supplied to this granular material, as shown in Figures 2 to 5. The mixing and granulation process can be performed by adjusting the blending conditions and mixing time by adjusting the water content of the mud or the amount of modifier added. The loosening and granulation process can be performed by adding a modifier to the mud or the like, solidifying it, and then excavating it with a backhoe.

[0047] Furthermore, the first carbon-containing material, cement-containing soil or modified soil, may be produced by fixing CO2 in the cement or modifier before mixing with mud or the like, and then adding the CO2-fixed cement or modifier to the mud or the like and mixing them.

[0048] The second carbon-containing material preferably has a particle size of 40 mm or less. In the case of recycled aggregate or slag, it is gravel-mixed sand-like and may contain fine particles. It can be used as a cover soil in this state, and voids are formed between the cover soil, allowing air to penetrate to the interior, resulting in high CO2 fixation efficiency. Furthermore, in the case of cement-containing soil or modified soil, granular soil allows air to penetrate to the interior, resulting in high CO2 fixation efficiency. Therefore, it is preferable to add cement or a modifier to mud or the like, and then carry out the same mixing and granulation process or the loosening and granulation process after solidification, resulting in a state containing granular particles with a particle size of 40 mm or less. Incidentally, "a state containing granular particles" refers to a state containing not only granular particles but also fine particles.

[0049] The third carbon-containing material can be produced by mixing a covering material such as soil or the first or second carbon-containing material with an inorganic carbon-containing substance such as biochar, and may be in granular form both when the covering material is mixed with the inorganic carbon-containing substance and when used as a covering material, but it may not necessarily be in granular form.

[0050] Next, the carbon content of the carbon-containing material according to this embodiment will be described. 3 At least 3.6 kg of carbon is sequestered per m of waste disposal site. 2 It is preferable to fix at least 1.8 kg of carbon per layer (assuming a cover soil layer thickness of 50 cm and one or more cover soil layers).

[0051] It is preferable to select carbon-containing materials taking into consideration the ease of obtaining the material depending on the location of the disposal site (ensuring that the required amount is secured when needed), the method and distance of transportation of the material (ensuring that CO2 emissions during transportation are less than the fixed amount of CO2), etc.

[0052] In other words, the total amount of CO2 emitted during the production and transportation of the carbon-containing material and the amount of CO2 emitted during fixation of CO2 in the carbon-containing material (in the case of the first carbon-containing material) must not exceed the amount of CO2 fixed by the carbon-containing material. Table 1 shows the estimated amount of CO2 fixed by the carbon-containing material and the carbon content of the carbon-containing material.

[0053] [Table 1]

[0054] Steelmaking slag (CO2 fixation treatment) and PS ash-based improved soil (CO2 fixation treatment) in Table 1 are examples of the first carbon-containing material, and CaCO3 mixed soil (CaCO3 mixed amount 50,300 kg / m 3 ), biochar mixed soil (biochar mixed amount 50,300 kg / m 3 ) is an example of a third carbon-containing material. The carbon-containing materials in Table 1 are 3 At least 3.6 kg of carbon can be fixed per unit area. Untreated steelmaking slag and PS ash-based improved soil are examples of second carbon-containing materials, and when used as intermediate or final cover soil, CO2 fixation progresses over the medium to long term, making it possible to contain carbon up to the carbon content shown in Table 1.

[0055] If a waste disposal site has multiple sections A to C, the carbon-containing materials may be used in different ways, such as using a third carbon-containing material mixed with biochar in section A, a third carbon-containing material mixed with calcium carbonate in section B, and a first carbon-containing material such as CO2-fixing steel slag in section C, and may also be changed depending on the landfill section, location, cover soil layer, etc.

[0056] In addition to purchasing commercially available biochar, the third carbon-containing material, it is possible to collect and carbonize pruned branches from green spaces within the waste disposal site, woody and herbaceous plants growing in the surrounding area (undergrowth cuttings, thinning materials, bamboo cut from abandoned secondary forests, etc.), rice husks from nearby rice fields, etc., and use this to locally produce and consume carbon-containing materials, shorten transportation distances, and reduce CO2 emissions during transportation.

[0057] The cover soil material of this embodiment can be applied to both land-based and offshore disposal sites, but the amount of carbon fixation per unit area is greater in land-based disposal sites, which require intermediate cover soil.

[0058] Patent documents 3 and 4 describe technologies for mixing charcoal into the cover soil at waste disposal sites, but these are intended to improve the adsorption and decomposition of pollutants and the air and water permeability, and have a different purpose from the carbon fixation of the present application. Furthermore, Patent document 3 assumes a charcoal mixing ratio of about 50%, and Patent document 4 assumes the carbonized product alone or as a mixture (mixing ratio not specified), but the present application suggests adding charcoal at a rate of 300 kg / m to prevent charcoal from igniting and burning. 3 The following is stated.

[0059] Although the embodiments for carrying out the present invention have been described above, the present invention is not limited to these, and various modifications are possible within the scope of the technical concept of the present invention. For example, although the waste disposal site 10 in Figure 1 may be a controlled waste final disposal site, the present invention is not limited to this, and it does not have to be a controlled waste final disposal site.

[0060] 1 shows two intermediate soil cover layers, it may be one layer, or three or more layers. It may also be possible to have only a final soil cover layer without any intermediate soil cover layers.

[0061] Furthermore, the cover soil material for the waste disposal site according to this embodiment is made primarily from a carbon-containing material, and may contain small amounts of other materials, but may not contain other materials. [Industrial Applicability]

[0062] According to the present invention, by using a carbon-containing material in the cover layer that covers the waste at a waste disposal site, it is possible to easily contribute to the fixation of CO2 and carbon storage at the waste disposal site, and to contribute to the realization of carbon neutrality. [Explanation of symbols]

[0063] 1-3 Waste layers 10 Waste disposal site 10a Disposal Area 11,12 Intermediate soil cover layer 13 Final cover layer 30 Alkaline Materials

Claims

1. 1. A waste disposal site for depositing waste in a disposal area, comprising: A waste disposal site in which a carbon-containing material containing carbon is used as a cover layer covering the waste within the disposal area.

2. 2. The waste disposal site according to claim 1, wherein the carbon-containing material contains carbon by adsorbing and fixing carbon dioxide to an alkaline material.

3. 2. The waste disposal site according to claim 1, wherein the carbon-containing material is an alkaline material capable of containing carbon by fixing carbon dioxide in the atmosphere and / or generated from the deposits over the medium to long term.

4. 4. A waste disposal site according to claim 3, wherein the alkaline material has a particle size of 40 mm or less.

5. 2. The waste disposal site according to claim 1, wherein the carbon-containing material contains carbon by mixing an inorganic carbon-containing substance into a covering material.

6. The mixing amount of the inorganic carbon-containing material with respect to the covering material is 50 to 300 kg / m ３ 6. The waste disposal site according to claim 5, wherein

7. A waste disposal site as described in claim 5, wherein the covering material is at least one of soil and sand, an alkaline material that contains carbon by adsorbing and fixing carbon dioxide, and an alkaline material that can contain carbon by fixing carbon dioxide in the medium to long term.

8. The carbon-containing material is a material containing carbon. ３ 2. The waste disposal site of claim 1, which contains or is capable of containing at least 3.6 kg per unit area.

9. 2. The waste disposal site of claim 1, wherein the carbon-containing material is used in either or both of an intermediate cover layer that covers the waste and on which further waste is deposited, and a final cover layer that covers the waste but on which no waste is deposited.

10. 10. The waste disposal site according to claim 9, wherein the final covering soil layer is mixed with a solidifying material to prevent scattering of the covering soil.

11. A waste disposal site as described in claim 9, wherein the carbon-containing material is any one, any two, or all of the following: an alkaline material that contains carbon by adsorbing and fixing carbon dioxide, an alkaline material that can contain carbon by fixing carbon dioxide in the medium to long term, and a covering material that contains carbon by mixing an inorganic carbon-containing substance into the covering material, used in the intermediate covering layer and / or the final covering layer.

12. 11. A waste disposal site according to claim 2, 3, 4, 7 or 10, wherein the alkaline material is recycled aggregate, slag, cement-containing soil or modified soil.

13. A cover soil material for a waste disposal site, which is used for the cover soil layer in a waste disposal site according to any one of claims 1 to 11 and is made primarily from the carbon-containing material.

14. A method for producing a cover soil material for a waste disposal site, which is mainly made of the carbon-containing material used in the cover soil layer at the waste disposal site according to claim 2, comprising: A method for producing a cover soil material for a waste disposal site, comprising supplying carbon dioxide to the alkaline material and fixing the carbon dioxide to produce the carbon-containing material.

15. A method for producing a cover soil material for a waste disposal site, which is mainly made of the carbon-containing material used in the cover soil layer at the waste disposal site according to claim 3, comprising: When the alkaline material is cement-containing soil or modified soil, a method for manufacturing cover soil material for a waste disposal site is performed by adding cement or a modifying agent to the raw soil and carrying out a mixing and granulation process or a loosening and granulation process after solidification to make the soil contain a granular form.

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