JP2001239227A - Reclamation structure of waste and waste treating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems such as the ununiform settlement of waste and the damage of a mat for catching contaminant and to eliminate troubles such as making the laying operation of the mats for catching contaminant difficult and making the connection of the plural mats for catching contaminant unsatisfactory by preventing the occurrence of gaps between the waste and the mats for catching contaminant according to the state of ruggedness of the surface of the waste when the waste is covered with the mats for catching contaminant. SOLUTION: This reclamation structure of waste is constituted in such a manner that a surface leveling material layer is disposed on a waste layer which comprising discarded waste and a contaminant catching material layer is applied on the surface leveling material layer. The surface leveling material layer fills recessed parts on the upper side of the waste layer and allows the laying of the contaminant catching material layer to by performed easily. The unit of lamination consisting of the waste layer, the surface leveling layer and the contaminant catching material layer can be either one or two or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste landfill structure in, for example, a final disposal site for waste and a waste disposal method using the landfill structure.

[0002]

BACKGROUND OF THE INVENTION Today, we discharge large amounts of waste due to industrial activities and the daily lives of many people. Of the discharged waste, those that can be incinerated at the intermediate disposal site are left as ash after incineration, and those that cannot be incinerated are directly crushed or otherwise treated and landfilled at the final disposal site.

[0003] Since the waste is stored at the final disposal site for a long period of time, contaminants in the waste leak out of the disposal site as leachate (permeate that has passed through the waste layer) and are discharged from public water bodies or groundwater. May be contaminated. Therefore, the leachate is prevented from leaking to the outside by making the final disposal site a water-blocking structure to the surroundings, and the leachate is collected and treated by the attached water treatment equipment.

[0004] In other words, the final disposal site (managed final disposal site) currently being constructed has a water-impervious function, a processing function that does not affect the surrounding environment, and a large amount of waste until the site is closed or the site is used. A storage function for storing and stabilizing waste is required. In other words, efforts are being made to prevent secondary pollution, such as by operating leachate treatment facilities after landfilling.

[0005] As a final disposal site for waste, a closed system disposal site has recently been proposed and implemented. The closed system disposal site is a site where the final disposal site, which combines the intermediate treatment facility and the final disposal site, is made of a closed artificial structure.It has excellent landscape, safety, and a clean image compared to the conventional open type. It is a landfill site where consensus among residents can be easily obtained. There are types that move the building as the landfill progresses. The leachate is internally circulated and is not discharged outside the treatment plant. The leachate is circulated, keeping rainwater out of the roof and impermeable sheets. Long-term operation of the water treatment equipment and corresponding processing capacity are required.

Landfill sites purify large amounts of waste,
Without stabilization, closure and land use cannot be carried out, but the more aerobic the landfill waste layer containing organic matter, the earlier the pollutant concentration in leachate will decrease and the landfill will stabilize earlier. It is also clear.

[0007] In Japan, from the standpoint of land use and surrounding environment conservation, it is a basic direction to accelerate the decomposition of waste by stabilizing the landfill by making the landfill an aerobic microbial environment. It has been.

Further, a semi-aerobic landfill structure for reducing the treatment load of leachate has become widespread. Semi-aerobic landfills provide a leachate drainage pipe consisting of gallstones and perforated pipes, called drainage pipes, at the bottom of the landfill to discharge leachate out of the landfill as quickly as possible and create a landfill waste layer. By preventing the leachate from accumulating, it prevents the seepage of the leachate into the foundation ground, and air is introduced into the landfill through the drainage pipe due to the heat convection caused by the temperature difference between the inside and outside of the landfill. It is intended to make the leachate as aerobic as possible and to purify leachate as much as possible at the stage of collecting water.

In a final disposal site provided with both general and industrial wastes, the landfill volume is, for example, 2,000,000 to 300,000.
It is said that 10,000 m ³ is desirable. The waste to be disposed of is
General wastes include incineration residue ash and non-polluting incineration fly ash. Industrial wastes include cinders, sludge (inorganic and organic sludge), rubber waste, glass waste and ceramic waste, slag, detoxified soot and so on.

The landfill method includes a sandwich method in which waste is laid horizontally and a waste layer and a soil cover layer are stacked in a sandwich structure, and a unitary structure, and a top surface and a slope of landfill waste in one day. There is a cell system in which a unit structure is obtained by applying soil covering and finishing in a cell shape, and the cell system is often employed.

The size of the cell, which is the unit structure of the cell system, is
It depends on the amount of landfills a day. Since an independent landfill layer is formed for each cell, it is effective in preventing disasters such as fires, scattering of wastes, and generating odors and sanitary insects. On the other hand, the movement of generated gas and water in the landfill layer is hindered,
It is said that this point must be taken into account when installing leachate collection and drainage facilities and generated gas treatment facilities.

[0012] Covering soil is to cover the soil with waste.
It plays an important role in the emission of foul odors, scattering and outflow of waste, propagation of sanitary pests and pests, prevention of fire and spread of fire, and protection of the surrounding environment such as landscape. In addition, the role of landfill management, such as waste loading, spreading and spreading work, and prevention of rainfall intrusion, is also important.

However, excessive soil cover not only reduces the landfill disposal capacity, but also impairs the movement of generated gas and water, especially on the same day soil cover, and delays the decomposition of organic substances due to poor air permeability. Factor becomes large. However, this does not apply to intermediate earth covering where it is expected that vehicle traffic and surface water due to rainfall will be eliminated. Therefore, in consideration of the purpose of the soil covering, the type of waste, etc., an appropriate earth covering material, earth covering thickness and construction method are adopted.

The earth covering includes a soil covering on the same day, an intermediate earth covering, and a final earth covering in chronological order.

Immediate soil covering is performed when the thickness of the landfill layer reaches a certain level or when one day of landfill work is completed. The soil is prevented from scattering, preventing the generation of bad smell, preventing the occurrence of sanitary insects, The purpose is to prevent intrusion of precipitation. The thickness of the cover soil is 30 to 50 cm when the waste to be reclaimed is mainly composed of noncombustible materials and the shape is relatively large, and 15 to 20 cm when the shape is small such as crushed waste or incinerated ash.
cm is standard.

Intermediate soil cover is used as road ground for incoming vehicles as the landfilling of waste proceeds, and when the time required for stacking cells in the next step is long, excessive infiltration of rainwater from the landfill surface is considered. This is done for the purpose of prevention. The thickness is 50c
m.

The final covering is performed when the landfill of the waste is completed, and is performed for the purpose of reducing leachate, using the former land, and improving the landscape. The thickness is from 50cm to 1m or more,
There are various cases.

Since the covering material has an effect of promoting the stabilization of the waste and an effect of reducing the amount of leachate, the selection of the material is important.
Although there is no quantitative standard for selection, there is the following general selection standard (by Masaru Tanaka, Introduction to Waste Management, published by Japan Society for Environmental Measurement and Analysis, 1998).

Same day soil covering material promotes the decomposition of waste with better air permeability than rainwater penetration prevention. Intermediate soil covering clay or silt based soil with low water permeability to prevent gas leakage and rainwater intrusion. When the material and the vehicle are also used for traffic, a soil material having a relatively large supporting force is suitable, and a cohesive soil capable of constructing a stable slope is suitable for the slope covering soil. In the United States, adaptability and design standards for the covering function of materials have been proposed for intermediate and final coverings.

In recent years, in cases where it is difficult to obtain a covering material or in order to secure landfill capacity, a covering method using a foaming agent (foam material) has been studied as a substitute for the covering material. in this case,
Since the bubbles disappear, there is no reduction in the landfill volume due to the covering, but the cost is high.

Leachate is treated by an appropriate treatment method until a predetermined standard is reached, since there is a concern that the leachate will have some effect on public water bodies until the closed condition is satisfied. The properties of leachate vary greatly depending on the type of waste to be landfilled, landfill structure and age. In general, when the designed inflow water is mainly composed of combustibles, biological treatment mainly functions because it contains a large amount of organic substances decomposed by microorganisms.

However, in the case of mainly non-combustible substances or when the elapsed years are long, the leachate contains a large percentage of organic substances that are hardly decomposable, and it becomes difficult to treat the leachate unless it is treated by physicochemical treatment. Also, the leachate is characterized by a very high ammonia concentration due to the decomposition of organic nitrogen components in the landfill layer.

When the amount of organic substances that are hardly biodegradable increases, physical and chemical treatments such as coagulation, adsorption of activated carbon, and ozone treatment are required.
A process with denitrification capability is required.

Further, in a landfill mainly composed of incinerated ash, the concentration of salts mainly composed of calcium, sodium and chloride ions becomes high, and there is a case where the surrounding water area may be affected. In such a case, a process for removing dissolved salts such as nanofiltration or electrodialysis is required.

The objects to be treated are BOD (biochemical oxygen demand), COD (chemical oxygen demand), SS (suspension material), TN (total nitrogen), chromaticity, heavy metals, etc. It is adopted according to the applicability of each processing method and the regionality.

Leachate treatment (leachate treatment system) is activated sludge, adsorption, contact, etc., and has a BOD value of 20 p.
When the water pressure drops below pm, water is discharged into rivers. Purified water that cannot be flowed to rivers in BOD, COD, and SS circulates, and a closed system such as applying it to sedimentary waste for aerobic decomposition (with a roof and no rainwater) is adopted. Without a roof, leachate would depend on rainfall.

Even after the waste disposal has been completed to the full capacity of the waste treatment facility, the BOD standard (COD 20 mg / liter, 20 mg / liter,
SS20mg / liter, T-N10mg / liter
In many cases, water treatment facilities will be operated for a long time until the following conditions are satisfied, during which time large maintenance costs will be incurred.

In general, an adsorbent is used for capturing contaminants as fine solid or liquid components. Activated carbon, zeolite, and the like are generally used as the adsorbent according to the purpose and the like. One kind of adsorbent is selected and used, and it seems that a mixture of a plurality of adsorbents is not practically used. In addition to adsorption, there is a method of trapping contaminants by a chemical reaction, for example, using lime for treating acidic substances.

Among the amorphous aluminum silicate colloids, allophane contained in volcanic ash soil, in particular, includes halloysite (caban ratio, ie, the molecular ratio of silica to alumina of 2.0) and imogolite (caban ratio of 1.0).
Shows properties similar to. For this reason, volcanic ash soil has properties such as chemically containing a large amount of active aluminum, having a large phosphate fixing ability, and accumulating a large amount of humus (soil organic matter), and can be used for capturing pollutants.

Japanese Unexamined Patent Publication No. Hei 11-90221 discloses a method in which dust produced from pulp chips is steamed and made into a fine charcoal, thereby making use of an interfacial phenomenon between water and oil to form a material that adsorbs oil. An “oil adsorbent for chip dust” has been proposed, which aims to achieve a double effect by packaging the material with an oil-adsorbing mat.

Japanese Patent Publication No. 55-40729 (Registration No. 1114)
No. 892) proposes a construction method in which a filter mat consisting of a heavy metal substance contaminant combined with a heavy metal trapping substance and a water-permeable woven fabric is spread and drained from the landfill soil. ing.

In Japanese Patent Application Laid-Open No. 55-155707, an upper mat, a crushed stone layer, a lower mat, an adsorbent layer and a bed are provided in a cylindrical body having a bottom, and a drainage pipe is provided in a space between the bed and the bottom. There has been proposed a "household filtration device" which is a simple and inexpensive purification device for household wastewater, which is provided with an air supply pipe.

A drain material using a polyester nonwoven fabric as an outer layer filter is commercially available. The outer layer filter has good air permeability and water permeability and is lightweight. Can be used as an exterior material for filling.

[0034]

The water treatment plant currently in operation has a sufficient function in planning, but if the equipment is adapted to the peak time of sewage, the scale of the equipment becomes too large. Not economical.

Further, since the leachate is purified until the water discharge standard is reached, the maintenance and management burden on the equipment during that period is enormous. Also, it is urgently necessary to take sufficient measures against off-flavors and odors at the treatment plant.

There is also a need for an improvement in the work of intermediately covering soil on waste sediment with locally generated soil and the like. That is,
Depending on the situation, it is difficult to roll and spread evenly with heavy equipment such as bulldozers and compactors, and in landfills without roofs, it is often difficult to cover soil in rainy weather or strong winds.

There is a demand for easy handling of earth covering with soil. That is, since the usability of locally generated soils having various properties is remarkably different, the landfill quality varies greatly, and countermeasures are required. There is a need for a material that is easy to handle, has a constant quality, and that assists and reinforces the purification treatment system with respect to pollutant trapping performance, including simply reducing the amount of treatment by the purification system.

When it is considered that the soil is covered with a mat-like material, a gap is formed between the upper surface of the waste and the mat depending on the unevenness of the surface of the waste. It can lead to damage. In addition, the unevenness and unevenness of the surface of the waste cause inconveniences such as difficulty in laying the mat and improper connection of a plurality of mats.

[0039]

A waste landfill structure according to the present invention fills a waste layer composed of discarded waste and a concave portion above the waste layer, and the upper portion is formed substantially flat. The surface leveling material layer is provided with one or two or more lamination units composed of the contaminant trapping material layer laminated and coated on the surface leveling material layer.

Here, the surface leveling material layer is a soil material,
A porous powder or a mixture thereof can be used, but any other harmless powder may be used.
Further, a material excellent in ventilation and water permeability is preferable. Wastes that have been examined and controlled for particle size and dispersibility may be used. Further, it is preferable that the contaminant trapping material layer has a mat-like form in consideration of the convenience of construction.

Further, the waste disposal method according to the present invention comprises:
A waste layer made of discarded waste, a surface leveling material layer that fills a concave portion on the upper side of the waste layer and has an upper portion formed substantially flat, and laminated on the surface leveling material layer -One or more laminated units composed of the coated contaminant trapping material layer are laminated, water is supplied from above to the laminated unit, and the water permeated through the laminated unit and discharged is purified. Things.

Here, as the surface leveling material layer, a soil material, a porous powder or a mixture thereof may be used, or any other harmless powder may be used. . Further, a material excellent in ventilation and water permeability is preferable. Further, a waste obtained by examining and managing the particle size and dispersibility may be used as the surface leveling material layer.

It is preferable that the purified water is supplied to the lamination unit from above and circulated for use. In addition, it is preferable that the dissolved oxygen in the water is enriched for early stabilization of the waste treatment plant. Further, it is preferable that the permeated water is sprayed on the surface of the laminated unit or discharged from a pipe provided above the laminated unit to permeate and permeate the laminated unit.

[0044]

FIG. 1 is an explanatory view of a waste landfill structure according to an embodiment of the present invention. As shown in the figure, the landfill structure for the waste fills a waste layer 10 composed of the dumped waste and a concave portion above the waste layer 10,
It has a stacking unit composed of a surface leveling material layer 12 whose upper part is deposited and formed substantially flat, and a contaminant trapping material layer 14 laminated and coated on the surface leveling material layer 12.

The waste layer 10 is formed of various kinds of waste, and the upper surface of the waste layer 10 has irregularities depending on the size, type and construction state of the dumped waste. It is preferable that the upper surface of the waste layer 10 is leveled for laminating and covering the contaminant trapping material layer 14. However, depending on the size and type of the waste, there is a limit to the leveling, and the formation of irregularities Is inevitable.

The surface leveling material layer 12 is formed of a soil material, a porous powder or a mixture thereof, but may be formed of any other harmless powder. In addition, a waste obtained by examining and managing the particle size and dispersibility may be used as the material of the surface leveling material layer 12.

The contaminant trapping material layer 14 is the surface leveling material layer 1
2 is formed by a contaminant trap mat 16 laminated and covered on the surface. As shown in FIG. 2, the contaminant trap mat 16 is formed of a particulate, powdery or fibrous pollutant trapping material 1.
8 and a bag-like exterior material 20 for keeping the pollutant trapping material 18 in a mat-like form.

As the contaminant trapping material 18, one having a physical adsorption function or a trapping function by a chemical reaction can be used. Examples of those having such a function include, for example, various types of activated carbon, synthetic (artificial) zeolites, imogolite, allophane, natural zeolites, and the like, but are not limited thereto. If so, other materials may be used.

The contaminant supplement material 18 may be granules or powder,
Either natural or artificial can be used. In addition, in order to maintain good air permeability and water permeability of both the granules and the powder, the particle size range should be as narrow as possible.

The purpose of the contaminant trapping material 18 is to mainly exhibit the above-mentioned contaminant trapping function, mainly the function of adsorbing a material having an adsorbing property, more effectively. It is effective to mix the materials. This improves the diffusivity of air and water in the contaminant trapping material layer 14, improves the contaminant trapping efficiency, and further helps to make the landfill atmosphere aerobic by moving and supplying air.

The above-mentioned fibrous material and hollow cylindrical material can be either natural or artificial, and the fibrous material or hollow cylindrical material having a pollutant trapping function can be used more effectively. Although expensive, fibrous activated carbon is suitable.

[0052] pollutants when the capture member 18 using activated carbon as, but varies widely depending on the condition such as suspended solids (SS) for performance and mixed activated carbon, leachate 1 m ³ per processing, the activated carbon weight, for example 30~100g Is effective. It is easy to use the circulation speed of about 25 to 50 cm / min, but these may be appropriately determined according to the actual situation at the site.

Activated carbon is called a non-polar adsorbent or a hydrophobic adsorbent, and selectively adsorbs a non-polar substance irrespective of a liquid phase or a gas phase. Physically and chemically stable, wide range of pH
It has many advantages, such as being usable in, and is widely used industrially. The use of activated carbon is particularly effective for COD and chromaticity, and is effective for BOD, SS and heavy metals. Also, T-N
Is also effective and can be widely applied.

Activated carbon can be used in either granular or powder form, but granular form is preferred for maintaining aeration and water permeability. The particle size of activated carbon and the type of adsorption performance are many and can be appropriately selected according to the purpose of use.

Zeolite has a function of effectively adsorbing and decomposing contaminants such as COD. In general, phosphorus that does not easily adsorb to zeolite can also be removed by combining zeolite with allophane (actually, weathered pumice may be used because it is contained in weathered pumice or the like). Heavy metals are well adsorbed on zeolite, and ammonia, hydrogen sulfide, acetaldehyde, etc., which cause malodor, are also well adsorbed.

A plurality of supplementary materials, for example, activated carbon and zeolite are mixed at a predetermined ratio to obtain the performance of the contaminant trapping layer,
For example, it is also effective to design the capture speed, the performance maintaining time, the type of the substance to be captured, and the like.

As the contaminant trapping material 18, for example, a material which contains silica and alumina components such as blast furnace granulated slag powder and fly ash and is amorphous and easily reacted is treated with an alkali such as sodium hydroxide. It is also known that zeolite-like substances are effective in removing ammonium ions, phosphorus, organic heavy metal ions, and the like by ion exchange with calcium in addition to adsorption due to a large specific surface area.

Examples of the bag-like exterior material 20 for containing the pollutant trapping material 18 include materials used for bags for dewatering bags and drainage materials for civil engineering, and artificial fibers such as natural fibers such as cotton and polyester fibers. It is possible to use a material having water permeability and air permeability using the material.

It is also effective to use the soil covered by the locally generated soil and the contaminant trap mat 16 in combination. For example, a method of laying the contaminant trap mat 16 and then covering the contaminant trap mat 16 with a thin layer is also practically effective for holding down the contaminant trap mat 16 and protecting the surface. Use of this method is also meaningful because it also serves to treat locally generated soil.

The contaminant trap mat 16 is permanently disposed of at the disposal site together with the waste. At this time, it is preferable that the contaminant trap mat 16 has a desirable function, for example, the decomposition of the waste proceeds by carrying microorganisms. If this is achieved, the present invention can be more effectively implemented.

A contaminant trap mat 16 is placed on the waste so as to cover the top of the waste layer.
It may be hung on a sediment so as to cover a futon. If necessary, the mat may be fixed to the sediment using a fastener. It is also effective to provide ears (edges) for fastening to the sediment.

In some cases, the mats are substantially connected to each other by fasteners to cover a wide area. In addition, it is effective to attach a string or rope of several meters in length to the four corners of the rectangle of the same mat and control the state while pulling the string or rope when installing on a waste deposit. is there.

Next, a method of treating landfill waste will be described. First, as shown in FIG.
Spray water 24 from above. The sprayed water 24 permeates the contaminant trapping material layer 14, the surface leveling layer 12, and the waste layer 10 in this order, is collected below, is sent to a water treatment facility (not shown), and is purified there. . The purified water 24 is again sprayed on the landfill layer 22, and the above process is repeated.

In the method of purifying pollutants, three points are controlled: the circulation and supply of the water 24, the performance of the pollutant trapping material 18, and the water treatment equipment (not shown).

The water sprayed on the contaminant trapping material layer 14 preferably has a higher dissolved oxygen content (DO) than usual.
This is because when the water enriched with dissolved oxygen permeates and passes through the waste layer 10 and the pollutant trapping material layer 12, purification of the pollutants is promoted.

The purification method described above is basically based on a circulation system in which the purified water is circulated without substantially entering rainwater. However, it is also effective in an open treatment plant where rainwater enters. It is.

In the above embodiment, the water is sprayed from above the contaminant trapping material layer 14. However, as shown in FIG.
0 may be arranged, and the water 24 may be sprinkled from the sprinkling pipe 30.

[0068]

According to the present invention, since the surface leveling material layer is provided, it is not necessary to cover the waste with the soil and cover it with heavy equipment for covering the soil. By simply spreading the soil, the soil can be covered (herein, the term “covering” is used even when a material other than a soil material is used), so that the covering operation is facilitated and the working time for the covering operation is shortened.

Further, according to the present invention, since the surface leveling layer is provided, there is no unexpected gap between the waste layer and the mat. ,
The mat can be prevented from being damaged due to unevenness, making it easier to lay the mat and connecting multiple mats well.

Further, according to the present invention, when the dissolved oxygen amount (DO) of the supplied circulating water is enriched more than usual, when the circulating water permeates and passes through the waste and the pollutant trapping material layer, It is more effective because it promotes purification.

According to the present invention, when a highly adsorptive soil material containing a large amount of allophane or the like or a material having a pollutant capturing function is used as the surface leveling material, the surface leveling material layer has a contaminant capturing function. Will have a positive
More effective.

Further, according to the present invention, when a waste material whose particle size and dispersibility have been examined and controlled is used as a surface leveling material, a large treatment capacity of a waste treatment plant can be allocated to the waste material. It is effective.

Further, according to the present invention, the leachate containing pollutants discharged from the waste landfill structure is purified by the pollutant trapping material layer, so that the processing load on the purification facility is reduced, and Equipment and operating costs are reduced,
Leachate management period is reduced.

Further, according to the present invention, when the material of the surface leveling material layer is made of a material having good ventilation and water permeability, the air permeability and water permeability of the soil, which had been a problem with soil covered by locally generated soil and the like, were low. Improved and facilitates the movement of generated gas and water in the landfill.

When a material that adsorbs odor and captures contaminants is used as the material of the surface leveling material layer, the odor generated in the waste treatment plant is further reduced by the adsorption action, and the surrounding environment is reduced. It is further improved.

According to the present invention, a system for controlling the promotion of waste purification by controlling the supply of circulating water for promoting purification, a pollutant trapping material, and a leachate treatment facility is effective. .

[Brief description of the drawings]

FIG. 1 is an explanatory view of a waste landfill structure according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a contaminant trap mat.

FIG. 3 is an explanatory view showing a state in which water is sprayed from above the waste.

FIG. 4 is an explanatory view of a waste landfill structure according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waste layer 12 Surface leveling layer 14 Pollutant trapping material layer 16 Pollutant trapping mat 18 Pollutant trapping material 20 Exterior material 22 Landfill layer 24 Water 26 Waterproof sheet 28 Final covering soil 30 Watering pipe

Claims (12)

[Claims] 1. A waste layer comprising discarded waste,
It comprises a surface leveling material layer in which the upper concave portion of the waste layer is filled and the upper portion is formed substantially flat, and a contaminant trapping material layer laminated and covered on the surface leveling material layer. A waste landfill structure comprising one or more lamination units. 2. The landfill structure for waste according to claim 1, wherein the surface leveling material layer is made of a material having excellent ventilation and water permeability. 3. The surface leveling material layer is made of a waste whose particle size and dispersibility have been examined and controlled.
Or the landfill structure for waste according to 2. 4. The landfill structure for waste according to claim 1, wherein the surface leveling material layer is made of a material having a function of adsorbing odors or pollutants. 5. The landfill structure for waste according to claim 1, wherein said contaminant trapping material layer has a mat-like form. 6. A waste layer comprising the dumped waste,
It comprises a surface leveling material layer in which the upper concave portion of the waste layer is filled and the upper portion is formed substantially flat, and a contaminant trapping material layer laminated and covered on the surface leveling material layer. Disposing of forming one or more laminated units, supplying water to the laminated units from above, collecting the water permeating and descending through the laminated units, and purifying the collected water. Object processing method. 7. The waste disposal method according to claim 6, wherein a material having excellent ventilation and water permeability is used as the surface leveling material layer. 8. The waste treatment method according to claim 6, wherein a waste whose particle size and dispersibility have been examined and controlled is used as the surface leveling material layer. 9. The waste disposal method according to claim 6, wherein the surface leveling material layer is made of a material having a function of adsorbing odors or pollutants. 10. The waste treatment method according to claim 6, wherein the purified water is supplied again from above to the lamination unit and circulated. 11. The waste treatment method according to claim 6, wherein the dissolved oxygen in the water is enriched. 12. The waste disposal method according to claim 6, wherein the water is sprayed on a surface of the stacking unit or discharged from a pipe provided above the stacking unit. .