JP2001129506A - Method for landfill disposal of waste and cover material used for landfill disposal of waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for landfill disposal of a waste used as a soil- covering material to be used in a final disposal site by treating a granular to matter contaminated with contaminants such as contaminated soil, incineration ash or the like, and its cover material. SOLUTION: A granulate matter contaminated with contaminant is charged into a treatment space of a granulation means 20 is separated into an independent granulate matter while water is added by making compression and inter- granulate grinding forces act and the contaminant sticking to the surface of the granulate matter is separated. The granulate matter is granulated and then classified by a classifying means 50 equipped with first and second liquid cyclones 51, 51R, a centrifugal separator or the like, and the classified granulate matter from which the contaminant is removed, is used as a cover material when landfill disposal of the waste is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for landfilling waste and a covering material.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing an example of a conventional final disposal site 10 for burying and storing waste such as incinerated ash and incombustibles obtained by incinerating combustible materials such as garbage. In the figure, reference numeral 1 denotes a landfill where a water-impervious sheet 2 is provided on the bottom and side surfaces, 3 denotes a leachate water collecting pipe installed on the surface side of the water-impervious sheet 2 laid on the bottom of the landfill 1, A leachate such as rainwater that has entered the landfill 1 is collected by the leachate collection pipe 3 with a protective soil layer for covering and protecting the surfaces of the leachate collection pipe 3 and the bottom impermeable sheet 2. It is sent to a leachate treatment facility (not shown) for treatment. Reference numeral 5 denotes a groundwater collecting pipe installed on the back side of the waterproof sheet 2 for collecting and discharging groundwater from a groundwater vein at the bottom of the disposal site and stabilizing the ground at the bottom of the disposal site. In addition, a clay layer is provided between the waterproof sheet 2 and the protective soil layer 4 at the bottom,
The leachate that has reached the surface of the clay layer may be removed by the leachate collecting pipe 3. Such a final disposal site 1
When the waste is landfilled at 0, a soil covering layer 7 (7a, 7b, 7c) is formed on the waste layer 6 composed of the waste put into the landfill 1 with earth and sand for environmental protection. Is done. That is, after the waste is put into the landfill 1, the waste layer 6 is spread horizontally and compacted,
For the purpose of preventing the scattering of the waste and the like, a cover layer 7 having a predetermined thickness is formed thereon, and the waste is newly buried on the cover layer 7. In this manner, the landfill operation of the waste is performed by alternately stacking the waste layers 6 and the cover soil layers 7.

[0003] As the type of the above-mentioned soil, in order to prevent the scattering of waste, the emission of foul odors, and the generation of sanitary pests such as flies, the same kind of soil covered immediately after the introduction of waste (cover layer 7) is formed.
a), an intermediate soil cover (soil layer 7b) for preventing gas from being emitted from the waste layer 6 and infiltration of rainwater into the landfill 1 before the landfill is completed, and formed at the top of the landfill 1. There is a final covering soil (covering layer 7c) which is used. In many cases, a soil suitable for vegetation, having a strong resistance to rainfall erosion, a low water permeability, and the like is used as the final covering soil. The thickness of each of the soil covering layers 7a to 7c is appropriately selected according to the type of waste to be landfilled, the type of soil covering material, the surrounding environment, and the like.

[0004]

As the soil covering material, clay, silt, sand (fine sand, fine sand, etc.) is used as shown in FIG.
A mixture of soil materials such as coarse sand) and gravel (fine gravel, medium gravel, coarse gravel) and rock materials such as Kobol, boulder, rock or bedrock is used in an appropriate amount. And the sand content, clay content, etc. are selected. For example, as a covering material to be used for covering soil on the same day, sandy soil with good water permeability and air permeability is desirable in order to spread the waste, compact the work, and secure the stability of the waste layer. However, when the odor emission of the waste is large, soil having poor air permeability may be used. Also, clay-based soil with poor air permeability is suitable for the intermediate soil for preventing rainwater from seeping. The final soil cover is as described above. Usually, as the soil covering material, easily available soil is used, and in many cases, the thickness and the like of the soil covering layer are appropriately adjusted to adjust water permeability and air permeability. However, in this case, soil having extremely high acidity or alkalinity or soil that deteriorates the properties of leachate must be avoided, so that a separate covering material must be prepared.

On the other hand, incineration ash buried in the final disposal site
Because of the large amount of waste and the harmful substances such as heavy metals and dioxins generated in the incineration process, which are attached to the incineration ash, they are often disposed after being melt-solidified. In this melting and solidification treatment, the incinerated ash is melted at a high temperature of about 1500 ° C. or higher and then discarded at a final disposal site.
It is said that since the heavy metals are sealed in the melt, the heavy metals do not elute even when the melt contacts water. In addition, the above-mentioned melt-solidification is said to be the most effective treatment by melt-solidification at present because, since the treatment temperature of incinerated ash is high, dioxins can be decomposed by thermal decomposition. This melting and solidification is the mainstream of incineration ash processing methods. However, melt solidification requires large equipment such as a melting furnace to melt incinerated ash at a high temperature, and requires a large amount of energy. There is a point. In addition, various studies have been made on the effective use of the incinerated ash that has been melted and solidified.

In recent years, there has been a problem that soil near factories such as chemical factories and metal refining factories is contaminated with heavy metals, organic chlorine compounds, oily components, and the like. In addition, the treatment of the soil on the beach contaminated with oil spilled into the sea due to a marine accident, or the excavated soil carried out due to the tunnel excavation in the ground where crude oil exists, will be difficult to process because of the attachment of crude oil. There are often. Further, the soil (contaminated soil) to which the pollutant in question is attached includes the soil contaminated by the incineration ash. The use of such contaminated soil is also limited, and most of it is disposed of at final disposal sites.

[0007] The present invention has been made in view of the conventional problems, and is used as a material for covering soil used in a final disposal site by treating particulate matter to which contaminants such as contaminated soil and incinerated ash are attached. An object of the present invention is to provide a landfill method and a covering material for waste, and to contribute to extending the life of a final disposal site by effectively utilizing these granular materials.

[0008]

According to a first aspect of the present invention, there is provided a method for landfilling waste, comprising: disposing of waste in a final disposal site; After removing the contaminant from the granular material to which the contaminant adheres, the granular material is used as a covering material.

According to a second aspect of the present invention, there is provided a method for landfilling waste, wherein the particulate matter to which the contaminant adheres is made of sand,
It is pebble.

A third aspect of the present invention is directed to the method for landfilling waste, wherein the granular material to which the contaminant adheres is contaminated soil.

[0011] In a fourth aspect of the present invention, the granular material to which the contaminants are attached is a waste to be disposed of at the final disposal site.

According to a fifth aspect of the present invention, there is provided a waste landfill method, comprising mixing the granular material from which the contaminants have been removed with a soil material or a rock material, and forming a material having improved physical properties of the granular material as a covering material. It is characterized by having done.

According to a sixth aspect of the present invention, there is provided a method of landfilling waste, wherein the waste is disposed of at a final disposal site, and when the landfill covering the top of the waste is landfilled, the granular material to which contaminants adhere is used. After removing contaminants, repeat the waste landfill treatment method using the granular material as a soil covering material a plurality of times, and cover the final soil with a soil material or rock material that does not contain the particulate material from which the contaminants have been removed. It is characterized by.

According to a seventh aspect of the present invention, in the covering material used for the landfill treatment of waste, the granular material to which the contaminant is adhered is charged into the treatment space and compressed and rubbed between the granular materials while adding water. By applying force, the granules are separated into independent granules, and the granules are separated by a granulating means for separating contaminants adhering to the surface of the granules. The present invention is characterized by using a granular material free from contaminants obtained by classifying the granular material. The granulation treatment of the granular material is, specifically, to apply a compressive stress to the granular material to which the contaminant input is attached,
A process in which a granular material having aggregated contaminants to which a large number of granular materials are adhered is separated into almost independent granular materials without breaking the granular material and refined (hereinafter referred to as a crushing process). Is performed), and a force of rubbing between the granules is applied to the granules so that mutual polishing is performed by friction between the granules, thereby contaminants adhering to the surface of the granules. (Hereinafter referred to as peptizing treatment).

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process flow showing a continuous processing system for particulate matter to which contaminants adhere according to the present embodiment. This processing system separates the particulate matter from the above-mentioned particulate matter, and removes the particulate matter containing no pollutant. It is classified into various sizes of granular material mainly composed of gravels, sand or fine-grained sand, and used as a constituent material of a covering material used in a final disposal site. The continuous processing system according to the present embodiment includes a receiving hopper 11
A primary fine-granulating machine 21 for coarsely pulverizing the above-mentioned granular material by adding water to the granular material to which the contaminant added thereto is attached, and adding water to the granular material crushed by the primary fine-granulating device 21. And
A fine-graining means 20 having a secondary fine-granulating machine 22 for performing the crushing and peptizing treatment of the granular material;
Primary sorter, which is a granular material separating means, for separating granular materials having a predetermined particle size of 5 mm to 10 mm or more and granular materials having a smaller size from among the granular materials discharged from A vibrating screen 23 and a secondary sorting vibrating screen 30, first and second hydrocyclones 51 and 51R,
The slurry having the thickener tank 55 and the centrifugal separator 57, and among the slurry having passed through the vibrating screen 30 for the secondary sorting, a granular material having a large particle size not containing the contaminant and a fine particle containing the contaminant Classification means 50 for separating
And a water supply unit 6 for supplying treated water to the grain refiner 20.
0 and a sewage treatment section 70 for purifying treated water discharged from the classification means 50.

FIG. 2 is a diagram showing an example of the configuration of the grain refiner 20. The grain refiner 20 includes a primary grain refiner 21 and a secondary grain refiner 22 in one shell 12. It is configured to be installed and operated by a common power unit 13. In addition,
In FIG. 2, reference numeral 14 denotes a processing material input port for inputting a granular material to which a contaminant, which is a processing material, is attached, and reference numeral 15 denotes a solution in a processing gap of each of the primary and secondary granulators 21 and 22 sequentially. A processing material discharge port for discharging the crushed and peptized granular material. As shown in FIGS. 3 (a) and 3 (b), both the primary grain refiner 21 and the secondary grain refiner 22 are attached to the inner peripheral surface along the axial direction and project in the center direction. A cylindrical rotary drum 16 having a plurality of outer blades 16W, and a plurality of radially projecting inner blades 17W mounted on the outer peripheral surface along the axial direction and eccentrically mounted inside the rotary drum 16 The rotating drum 16 and the rotor 17 are rotated in mutually opposite directions by the power machine 13 to compress and slide the processing material introduced into the processing space between the rotating drum 16 and the rotor 17. By applying a stress, a crushing treatment and a deflocculation treatment as described later are performed. The magnitude of the stress acting on the processing material is adjusted mainly by the distance between the rotating drum 16 and the rotor 17 (the eccentricity of the rotor 17) and the rotational speed of each of the rotating drum 16 and the rotor 17.

The primary grain refiner 21 or the secondary grain refiner 22
In the inside, as shown in FIG. 4, the granular material S to which the contaminant is thrown into the gap between the rotating drum 16 and the rotor 17, which is the processing gap, is scraped upward by the outer blade 16 </ b> W of the rotating drum 16. At the same time, since the granular material S is pulled down by the inner blade 17W of the rotor 17, a compressive stress and a shear stress act on the granular material S, so that the granular material S is pulverized and peptized. In other words, as shown in FIG. 5A, each of the granular materials p of the granular material P to which the contaminant adhered in the aggregated state by the granular materials being fixed to each other at the fixing surface r is attached.
Alternatively, compressive stress and shear stress act on the large-sized granules p, which are not fixed to each other, and each of the above-mentioned aggregated granules is separated from the above-mentioned fixed surface r to be substantially independent fine particles. Granulated into granular material p (crushing treatment)
At the same time, as shown in FIG. 5 (b), a force in the rubbing direction acts on the granular materials, and contaminants such as heavy metals and dioxins adhered to the surface of each granular material due to friction between the granular materials p. The granular piece of q is peeled off and separated from the granular body p (peptizing treatment). The contaminant q is attached not only to the surface of the aggregated granular material, but also to the fixing surface r, which is the surface of each granular material p (see FIG. 5A). Therefore, at the time of pulverization, a part of the contaminant q attached to the surface of the aggregated granular material may be peeled off, but most of the contaminant q is separated from the surface of the granular material p during the peptization. You. Some large-sized granular materials are crushed and refined.

As shown in FIG. 3 (a), the primary fine-granulating machine 21 for coarsely crushing the granular material to which the contaminant adheres has a small eccentricity of the rotor 17 and the rotary drum 16 and the rotor 1
With relatively wide spacing D ₁ of the 7, it has a rotational speed and a low speed. Further, in the secondary fine-granulating machine 22 which mainly performs the peptizing treatment of the above-mentioned granular material, as shown in FIG. 3B, the eccentric amount of the rotor 17 is increased so that the distance between the rotary drum 16 and the rotor 17 is increased. narrowing the D _2, and has a rotational speed to high speed.

Next, the processing flow of the continuous processing system for the granular material to which the contaminant adheres will be described with reference to the case where the processing material is incineration ash as an example. First, the incinerated ash supplied to the receiving hopper 11 is conveyed by a belt conveyor and is supplied to the primary granulator 21. Primary refiner 2
In 1, the treated water from a secondary treatment water tank 61 to be described later of the water supply unit 60 is added to the incinerated ash, the incinerated ash is roughly crushed, and the incinerated ash is separated into granular materials of various sizes. While moving dioxins and heavy metals that are weakly attached to the surface of the incineration ash while floating or dissolving in the treated water, moving the incineration ash downstream,
It is discharged from the outlet 21a of the primary granulator 21. In the primary grain refiner 21, since the distance between the rotary drum 16 and the rotor 17 is wide and the rotation speed is low, solids such as large metals and contaminants are discharged without being crushed. The large solid matter is captured and removed by a classification net 21b of about 30 mm provided at the discharge port 21a, and is carried out by a belt conveyor. On the other hand, the incinerated ash which has become a granular material of about 30 mm or less is sieved by the primary sorting vibrating screen 23 of about 10 mm. At this time, water is supplied to the primary sorting vibrating screen 23 from the water supply unit 60, and water that has passed through the primary sorting vibrating screen 23 and has suspended or dissolved dioxins and heavy metal contaminants is the first water to be described later. Is sent to the feed sump 40.
Approximately 10m sieved by vibrating screen 23
The incinerated ash that has turned into granular material of m
At 3M, after removing the metal pieces in the incineration ash, it is sent to the secondary granulator 22. On the other hand, 10 mm to 3 mm which were sieved and washed by the primary sorting vibrating screen 23
The granular material having a size of about 0 mm is carried out by a belt conveyor and is accumulated in an accumulation place A.

The incinerated ash that has passed through the primary sorting vibrating screen 23 is a granular material having a size of generally 10 mm or less.
In the secondary granulator 22, the treated water from the water supply unit 60 is added to the incinerated ash, and the rotary drum 16 and the rotor 17
And the rotation speed is increased, and the above incinerated ash is subjected to mutual polishing mainly by friction between the granular materials to remove heavy metals and dioxins strongly adhered to the incinerated ash. While moving the incinerated ash to the downstream side, the incinerated ash is sent to the secondary sorting vibrating screen 30 from the outlet 22 a of the secondary granulator 22. The secondary sorting vibrating screen 30 is used for sieving 5 mm or less granular material from the incinerated ash, and the granular material such as 5 mm or less of sand and fine ash particles discharged from the secondary sorting vibrating screen 30. Is temporarily stored in the first feed sump 40 and then classified by the classification means 50 into granular bodies of various sizes. In addition, the granular material mainly composed of gravel and fine ceramic pieces of about 5 mm to 10 mm sieved by the secondary sorting vibrating screen 30 is carried out by a belt conveyor, and the granular material having a size of about 10 mm to 30 mm, It is accumulated in the accumulation place A. 5mm accumulated in this accumulation place A
Granules having a size of about 30 mm are harmless because the pollutants such as dioxins and heavy metals have been removed, and can be reused. Therefore, the granular material accumulated in the accumulation site A can be used as a soil covering material of the final disposal site corresponding to the gravel material in FIG.

Next, details of the classification processing in the classification means 50 will be described. The mud-like incineration ash containing the granular material of 5 mm or less stored in the feed sump 40 is sent to the first liquid cyclone 51 and classified. In the first liquid cyclone 51, a granular material having a size of about 100 μm or less is separated by being suspended in treated water. The first hydrocyclone 51
The treated water containing the particulate matter of about 100 μm or less discharged from the upper part of the
The supernatant is sent to a second feed sump 41.
On the other hand, the slurry containing the particulate matter having a particle diameter exceeding 100 μm discharged from the bottom of the first hydrocyclone 51 is sent to the first spigot tank 52, and is then subjected to about 100 μm or more by the first dehydration vibration screen 53. Is separated and sent to the second feed sump 41. The particulate matter mainly composed of sand and gravel having a size of 100 μm to 5 mm separated by the first dehydrating vibration screen 53 is harmless because the pollutants such as dioxins and heavy metals are separated therefrom. It is carried out, collected at the collection site B, and reused. That is, the granular material accumulated in the accumulation site B can be used as a soil covering material of the final disposal site corresponding to the gravel material in FIG.

Similarly, the incinerated ash stored in the second feed sump 41 and having a size of about 100 μm or less is reduced to 20 to 100 μm by the second hydrocyclone 51R and the second dehydrating vibration screen 53R. It is classified into a granular material mainly composed of fine sand and fine particles having a size of 20 μm or less. That is, the treated water containing fine particles of about 20 μm or less discharged from the upper portion of the second liquid cyclone 51R is temporarily stored in the second feed sump 41, and then is transferred to the thickener tank 55 through the trash removal trommel 54. Sent to On the other hand, the slurry containing the particulate matter having a particle diameter exceeding 20 μm discharged from the bottom of the second hydrocyclone 51R is sent to the second spigot tank 52R,
The granular material mainly composed of fine sand of about 20 μm or more is separated by the dewatering vibration screen 53 </ b> R and sent to the thickener tank 55. Second dehydration vibrating screen 5
Granules mainly composed of gravel with a size of 20 μm to 50 μm separated by 3R are also harmless because dioxin and heavy metal contaminants have been separated, so they are carried out by a belt conveyor and accumulated at the accumulation site C. And reused. That is, the granular material accumulated in the accumulation site C can be used as a soil covering material of the final disposal site corresponding to the fine sand in FIG.

In the thickener tank 55, about 20 μm
The treated water containing fine particles of m or less and the mud-like incinerated ash are slowly rotated in a tank to perform solid-liquid separation for coagulating and sedimenting solids such as particulates. As described above, since the heavy metals separated from the incineration ash are dissolved or suspended in the supernatant liquid of the thickener tank 55, they are sent to the primary treatment water tank 71 of the sewage treatment section 70 for treatment. In the primary treatment water tank 71, the heavy metals are separated from the treatment liquid by forming an insolubilizing salt of the heavy metals by adding a chelating agent or the like to insolubilize the heavy metals. On the other hand, the slurry-like incineration ash settled at the bottom of the thickener tank 55 is stored in the first slurry tank 56, and after removing fine particles such as dioxins in the centrifugal separator 57, the second slurry It is sent to the tank 58 and stored. The harmful sludge containing a large amount of fine particles such as dioxins separated by the centrifugal separator 57 is discarded by performing a process such as melting and solidification. On the other hand, the slurry stored in the second slurry tank 58 is rendered harmless by removing heavy metals and dioxins.
The slurry can be reused by preparing a dewatered cake from the slurry by a filter press (not shown).

The water dehydrated by the dehydrator 59 is sent to a filtered water return tank 72 where it is temporarily stored. After that, heavy metals are insolubilized in a primary treatment water tank 71 and then sent to a liquid filtration device 73. In the liquid filtration device 73, the treated water is filtered with an adsorbent such as activated carbon to remove heavy metals and dioxins and purify the treated water. The purified treated water is sent to a secondary treated water tank 61 which is a water supply unit. Also, the treated water sent from the thickener tank 55 to the primary treated water tank 71,
After being purified by the liquid filtration device 73, the secondary treatment water tank 6
Sent to 1. The treated water returned to the secondary treatment water tank 61 is
After being mixed with fresh water for replenishment, the primary granulator 21,
It is supplied to the secondary granulator 22 and the primary sorting vibrating screen 23 and the like.

FIGS. 6 to 8 show the results of treating incinerated ash in the present embodiment. FIG. 6 is a table showing the results of a dissolution test of heavy metals, and FIG. 7 is a bar graph showing a part thereof. Things. FIG. 8 is a table showing the measurement results of dioxin concentrations. As is clear from FIG. 6, harmful heavy metals such as lead, cadmium, and selenium were not detected in the sandy matter obtained by the peptization treatment obtained by the present treatment system, and were contained in the raw ash. A trace amount of copper (1/300 of the reference value) is further reduced to about 1/5. In addition, no harmful heavy metals such as lead, cadmium, and selenium are detected from the dehydrated cake made from fine particles having a size of about 20 μm or less. On the other hand, about 86% of the amount contained in the raw ash
Not only was lead detected, but cadmium and selenium were also detected at about the standard value. This indicates that the heavy metals adhering to the incineration ash were eluted or suspended in the treated water during the incineration ash treatment process, and the separation of the heavy metals from the incineration ash in the deflocculation process was reliable. It shows that it was done. As shown in FIG. 8, dioxins are detected from the incinerated ash (sedimentary mud in FIG. 8) discharged from the thickener tank 55, but dioxins of 5 mm or more obtained by the treatment system of the present invention are obtained. Granules (grit 5 mm or more in the figure) or 20 μm to 5 mm granules (sand,
(Fine sand: 5 mm or less in the figure), so that dioxins were sufficiently separated. Further, since dioxins are slightly detected in the water discharged from the thickener tank 55 (the supernatant liquid in the sedimentation tank in the same figure), most of the dioxins peeled off from the incineration ash in the pulverization step are fine particles. Is contained in the above-mentioned incinerated ash in the form of slurry, but it is considered that a part thereof becomes fine powder and floats in the treated water.

Thus, the classified collection area A is 5 mm.
As described above, the above-mentioned granular material (gravel), the granular material of 100 μm to 5 mm in the accumulation site B (sand and gravel), and the granular material of 20 μm to 100 μm in the accumulation site C (fine sand) are covered with soil used in the final disposal site. It can be seen that it can be used as a component material. In addition, the above-mentioned dewatered cake, metal pieces and the like can also be used as recyclable resources, and sludge containing a large amount of separated heavy metals and dioxins can be buried in a final disposal site. The reusable granular material accounts for about 60% of the incinerated ash, so that a material for covering soil can be obtained from the incinerated ash, and a remarkable effect can be obtained for reducing the volume of the incinerated ash. can get. In particular, when the particulate matter to which the contaminant is attached is a particulate matter to which the contaminant to be disposed of at the final disposal site is used, it is not necessary to bury the particulate matter and the final disposal The amount of landfill disposal can be greatly reduced.

In the above embodiment, the case where the material to be treated is incineration ash has been described. For contaminated soil, contaminants adhering to soil particles are efficiently removed by the same treatment method as incineration ash. It is possible to extract stones, sand, fine particles and the like in the contaminated soil. Therefore, the soil covering material used for the final disposal site can be obtained from the contaminated soil, and the volume of the contaminated soil to be discarded can be significantly reduced. The above accumulation areas A and B
And the particulate matter from which the pollutants accumulated in C have been removed,
After the waste is disposed of at the final disposal site, it is covered on the same day as soil covering, intermediate covering, or final covering. At this time, the granular materials accumulated in the accumulation sites A, B and C can be mixed and used so as to have an appropriate particle size and sand content depending on the purpose of the soil covering. Further, the accumulation site A,
The granular materials accumulated in B and C are added to clay material, silt, sand, gravels and other soil materials or Kobol, Boulder,
A rock material such as a rock or a bedrock can be appropriately mixed to form a soil covering material. In addition, about final covering soil, accumulation place A,
Granules accumulated in B and C can be used, but when a final disposal site where final soil covering is completed is used as a park or the like, it is desirable to use a covering material that is normally used in consideration of the user.

[0028]

As described above, according to the first aspect of the present invention, when the waste is disposed of at the final disposal site and the upper part of the waste is landfilled, contaminants adhere to the landfill. After removing the above contaminants from the granules, the granules were used as a soil covering material. This not only eliminates the necessity of preparing new earth covering materials, but also effectively utilizes the granules with contaminants to be disposed. Waste can be greatly reduced in volume.

According to the second aspect of the present invention, the particulate matter to which the contaminants adhere is made into sand and gravels in the incineration ash.
Sand and gravel contained in the incineration ash can be rendered harmless and used effectively as soil covering, and the volume of incineration ash discarded to the final disposal site can be reduced.

According to the third aspect of the present invention, since the granular material to which the contaminant is attached is regarded as contaminated soil, the soil particles constituting the contaminated soil can be detoxified and effectively used as cover soil. The volume of contaminated soil discarded to the final disposal site can be reduced.

According to the fourth aspect of the present invention, the particulate matter to which the contaminants are attached is a waste to be disposed of at the final disposal site. Part or all can be replaced with granules to be discarded. Therefore, the volume of the waste can be reduced, and the life of the final disposal site can be extended.

According to the fifth aspect of the present invention, the granular material from which the contaminants have been removed is mixed with a soil material or a rock material, and a material having improved physical properties of the granular material is used as a covering material. The physical properties of the covering material can be adjusted while using the above-mentioned granular material.

According to the sixth aspect of the present invention, when the waste is discarded at the final disposal site and the landfill covering the top of the waste is landfilled, the contaminant is removed from the granular material to which the contaminant adheres. After the removal, the method of landfilling the waste using the granular material as a covering material was repeated a plurality of times, and the final covering was covered with a soil material or a rock material that did not contain the particulate material from which the contaminants had been removed. When the final disposal site where the final soil covering is completed is used as a park or the like, the user can use it with a sense of security.

According to the seventh aspect of the present invention, the granular material to which the contaminant adheres is charged into the processing space, and the compressive force and the rubbing force between the granular materials are applied while adding water. The granules are separated into independent granules, and the granules are separated by a granulating means for separating contaminants attached to the surface of the granules.After the granules are refined, the granules are classified. As a result, it is possible to reliably obtain a particulate matter from which contaminants have been removed and which can be used as a covering material used in a landfill.

[Brief description of the drawings]

FIG. 1 is a diagram showing a processing flow according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a grain refiner according to the present embodiment.

FIG. 3 is a diagram showing setting conditions of a primary granulator and a secondary granulator.

FIG. 4 is a diagram for explaining a crushing / peptizing action of the present embodiment.

FIG. 5 is a diagram for explaining a crushing / peptizing action of the present embodiment.

FIG. 6 is a diagram showing a processing result of incineration ash processed by the continuous processing system of the present embodiment.

FIG. 7 is a graph showing a processing result of incinerated ash processed by the continuous processing system of the present embodiment.

FIG. 8 is a graph showing a processing result of incinerated ash processed by the continuous processing system of the present embodiment.

FIG. 9 is a schematic diagram for explaining a landfill state of a final disposal site.

FIG. 10 is a diagram illustrating a particle size classification of a covering material.

[Explanation of symbols]

1 landfill, 2 impermeable sheet, 3 leachate collection pipe,
4 Protected soil layer, 5 Groundwater collecting pipe, 6 Waste layer, 7
(7a, 7b, 7c) Cover soil layer, 10 Final disposal site, 1
1 receiving hopper, 12 shells, 13 power machine, 1
4 treatment material inlet, 15 treatment material outlet, 16 rotating drum, 16W outer blade, 17 rotor, 17W inner blade, 20 refiner, 21 primary refiner, 22
Secondary Atomizer, 23 Primary Vibrating Screen, 23M
Magnetic metal removal machine, 30 secondary sorting vibrating screen,
40 first feed sump, 41 second feed sump, 50 classifier, 51,51R hydrocyclone, 52,52R spigot tank, 53,53R
Dehydration vibrating screen, 54 Waste treatment trommel, 55
Thickener tank, 56, 58 slurry tank, 5
7 centrifuge, 59 dehydrator, 60 water supply section, 61
Secondary treatment water tank, 70 Sewage treatment unit, 71 Primary treatment water tank, 72 Tank for returning filtered water, 73 Liquid filtration device.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takao Sango Go 7th floor of the Ohashi Building, 2-3-13 Shinjuku, Shinjuku-ku, Tokyo Inside the Molten Resources Co., Ltd. No. 1 Kumagaya Gumi Tokyo Head Office (72) Inventor Yutaka Shinta 265 Sakurazawa, Yorii-cho, Osato-gun, Saitama F-term (reference) 4D004 AA36 AA41 AA46 AB03 AB07 AC05 BA02 BB03 CA07 CA10 CA13 CB13 CC03

Claims (7)

[Claims] Claims: 1. In a method of landfilling a waste, which disposes the waste to a final disposal site and covers the top of the waste, after removing the contaminant from the granular material to which the contaminant adheres,
A method for landfilling waste, comprising using the granular material as a covering material. 2. The method according to claim 1, wherein the particulate matter to which the contaminant adheres is sand or gravels in the incineration ash. 3. The method according to claim 1, wherein the granular material to which the contaminant adheres is contaminated soil. 4. The landfill according to claim 1, wherein the particulate matter to which the contaminant adheres is a waste to be disposed of at the final disposal site. Processing method. 5. The method according to claim 1, wherein the granular material from which the contaminants have been removed is mixed with a soil material or a rock material, and a material having improved physical properties of the granular material is used as a covering material.
The method for landfill disposal of waste according to claim 4. 6. A method for landfilling a waste, wherein the waste is disposed of at a final disposal site, and the upper part of the waste is landfilled.
The method of reclaiming waste using the granular material as a covering material is repeated a plurality of times, and the final covering is covered with a soil material or a rock material that does not contain the particulate material from which the contaminants have been removed. Landfill disposal method. 7. The granules to which the contaminants are attached are introduced into the processing space, and the granules are separated into independent granules by applying a compressing and rubbing force between the granules while adding water. The granular material obtained by finely dividing the granular material by the fine-granulating means for separating the contaminant attached to the surface of the granular material and then classifying the granular material is not used. A soil covering material used for landfill disposal of waste, comprising: