JPH04367775A - Method and sheet for landfilling treatment of waste - Google Patents

Abstract

PURPOSE:To prevent the penetration of rainwater into a waste bed and to diffuse generated gas to the atmosphere by covering the entire surface of the waste bed with a treatment sheet having water-proofness of specific water pressure resistance and air permeability of specific air-permeable quantity and covering said sheet with soil. CONSTITUTION:The entire surface of a waste bed 5 is covered with a treatment sheet 7 (e.g., polytetrafluoroethylene sheet) having water-proofness of water pressure resistance of 30cm H2O or more and air permeability of air-permeable quantity of 0.01cc/cm<2>.sec or more and the sheet 7 is covered with soil 8. That is, only by covering the entire surface of the waste bed 5 with the treatment sheet 7 and covering the sheet 7 with soil, the penetration of rainwater into the waste bed can be prevented and generated gas can be diffused to the atmosphere.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a processing method that can prevent the infiltration of rainwater and discharge generated gas when industrial waste, household waste, or its incinerated ash is disposed of in landfills on land or in the sea. and the processing sheet to be used.

0002

[Prior Art] Conventionally, in order to dispose industrial waste, household waste, or their incinerated ash, etc. in a landfill, the waste is deposited on a landfill foundation ground that has been subjected to a surface impermeable construction or a vertical impermeable construction. In addition to compacting and final covering with soil, a gas venting structure is installed to remove gases such as carbon dioxide, methane, and ammonia generated from the waste.

[0003] Furthermore, when it rains, rainwater infiltrates, becomes contaminated with waste, and may leach out, contaminating groundwater, rivers, etc., so it is necessary to install drainage collection and pollution treatment facilities at the landfill. It costs a huge amount of money.

[0004] In order to reduce the burden on the above-mentioned water collection and drainage facilities and sewage treatment facilities, a construction method has been adopted in which the entire surface of the waste landfill is covered with a water-shielding sheet, but this method prevents the decay of organic substances in the waste, As carbon dioxide, methane, ammonia, etc. are generated over many years due to decomposition, gas treatment facilities such as ventilation equipment are required. There are also restrictions on usage.

[0005]

[Problems to be Solved by the Invention] The present invention is capable of preventing rainwater from penetrating during rainfall even if waste is disposed of in a landfill, preventing contamination of groundwater and rivers, and reducing the amount of gas generated from waste. The object of the present invention is to provide a landfill disposal method for waste that can be dissipated into the atmosphere without requiring special facilities for treating generated gas, and to coat the waste with a layer that has sufficient waterproofness and permeability to generated gas. Our goal is to provide a processing sheet that will

[0006]

[Means for Solving the Problem] In order to solve the above problem, the invention of claim 1 has waterproof property and covers the entire surface,
After covering the entire surface of the waste deposited on the foundation ground using a sheet that is both waterproof and breathable, a suitable number of locations distributed at least approximately evenly are covered with the sheet. The structure is such that the soil is covered with soil.

[0007] In the invention of claim 2, the treated sheet has a water pressure resistance of 30 cm or more of water column and an air permeability of 0.01 cm.
The structure has an air permeability of c/cm2・sec or more,
In the third aspect of the invention, the treated sheet has a structure in which a breathable protective fabric is laminated on at least one surface of a waterproof and breathable synthetic resin sheet.

[0008]

[Operation] According to the invention of claim 1, deposited by a conventional method,
After covering the surface of the leveled and compacted waste with a sheet that is both waterproof and at least partially breathable,
Because the sheet is covered with soil, rainwater does not permeate into the waste pile layer due to the sheet's waterproof properties, and instead flows from the soil covering layer into water collection ditches, etc., and rainwater that comes into contact with waste from groundwater and rivers is removed. There is no risk of contamination.

[0009] Furthermore, various gases generated from the waste are released into the atmosphere from the breathable portion of the sheet through the soil covering layer.

Furthermore, even if uneven settlement occurs in the waste layer,
If the sheet covering the layer is made to have extensibility, it will bend and adhere to the unevenness caused by uneven settlement, and the waste layer, the sheet, and the covering soil will always be in full contact with each other. No voids such as gas pockets are formed.

[0011] In the invention of claim 2, since the treatment sheet has a water pressure resistance of 30 cm or more of water column, it is possible to prevent rainwater from penetrating into the waste layer by covering with soil to a thickness corresponding to the water pressure resistance. It can be prevented and 0.01cc/cm2・s
Since it is said to have air permeability of EC or higher, various gases that are generated over many years in the case of ordinary waste can be naturally dissipated into the atmosphere via the soil covering layer.

According to the third aspect of the invention, a treated sheet having desired characteristics can be easily obtained by utilizing the characteristics of the synthetic resin sheet or film and the characteristics of the fabric.

[0013]

Embodiment FIG. 1 is a schematic cross-sectional view of a state in which waste 2 is reclaimed and leveled in a valley 1 using the method according to the present invention.

The foundation ground 3 of the valley 1 is completely waterproofed with a waterproof sheet 4 such as a synthetic resin sheet. The waste material 2 is deposited, leveled, and compacted to form a waste layer 5.

The above-mentioned surface impermeability by the waterproof sheet 4 prevents groundwater and the like from flowing into the waste layer 5.

In the present invention, the entire surface 6 of the waste layer 5 formed as described above is coated with a waterproof and breathable treatment sheet 7 to form a series of continuous surfaces.

A layer of covering soil 8 is formed on the upper surface of the treatment sheet 7, leveled, and compacted to complete the landfill treatment.

As shown in FIG. 2, the above-mentioned treated sheet 7 is arranged on a waterproof base sheet 9 at approximately equal intervals W1,
The sheet material 10 distributed at a plurality of locations at W2 is made into a sheet that is not only waterproof but also breathable.

The treated sheet 7 may be entirely formed of a waterproof and breathable sheet.

The water pressure acting on the treated sheet 7 during rain is a hydrostatic pressure corresponding to the thickness H of the layer of covering soil 8.

[0021] Since the thickness of the layer of covering soil 8 is set to be about 30 cm at the minimum, the waterproof property of the treatment sheet 7 requires a water pressure resistance of 30 cm or more of water column by the hydrostatic pressure method shown in Japanese Industrial Standard L1092-1977. However, a material with water pressure resistance equal to or greater than the layer thickness H of the covering soil 8 is used.

[0022] From the waste layer 5, carbon dioxide, methane, ammonia and other harmful gases are generated for many years.

For this reason, the treated sheet 7 is required to have an air permeability as shown in Japanese Industrial Standard L1096-1979, with an air permeability of 0.01 cc/cm2·sec or more according to method A; If this occurs, the treatment sheet 7 and the covering soil 8 may swell due to gas retention, and unexpected eruptions may occur, creating a danger.

Even if the waste layer 5 is leveled and compacted, it tends to settle unevenly over time, and when the treatment sheet 7 is laid down, contact between the sheet 7 and working machines, etc. Easy to occur.

[0025] Therefore, if the treated sheet 7 does not have extensibility, it will not be able to adapt to the unevenness caused by uneven subsidence, and breakage may occur.
Damage may occur due to abrasion from working machinery, and there is a risk that rainwater may seep in from the broken or damaged area.

Therefore, the processing sheet 7 has a weight of 5 kg.
It is preferable that the treated sheet 7 has an extensibility of elongating by 10% or more under a tensile load of /5 cm, and if the extensibility is less than the above value, breakage is expected to occur. However, if the treated sheet 7 has a high tensile strength, Stretchability is not required.

The processing sheet 7 used for the above-described waste landfill treatment has a thickness of 100 microns to 2 microns.
A sheet of tetrafluoroethylene or polyolefin with a diameter of 30 microns or less chemically or mechanically drilled into it, or a sheet with a thickness of 1 to 30 microns.
A 1.5 mm sheet of synthetic rubber, vinyl chloride, or the like may be needled at about 20 locations per square inch.

In the mechanically needled treated sheet described above, when the gas pressure on the bottom surface of the sheet increases, the piercing portion opens and gas is discharged, and when the gas pressure is low, it closes and completely closes. Produces a waterproof effect.

As mentioned above, the treatment sheet 7 is subjected to external forces such as uneven settling of the waste layer 5, contact with a working machine during laying work, or contact with protrusions in the waste. Therefore, high tensile strength is required.

Therefore, as described above, the treated sheet 7 may be a single sheet of synthetic resin such as tetrafluoroethylene, but it is preferable that it be reinforced as shown in FIG. 3 or 4. preferable.

FIG. 3 shows that a fabric 11 with low elongation, such as a woven fabric or a non-woven fabric, is used as a protective fabric, and is laminated on the synthetic resin sheet 12 that has both waterproofness and breathability, and is integrated with the treated sheet 13. It shows what was done.

FIG. 4 shows another example of the processing sheet,
Fabrics 15 and 16 similar to the fabric 11 shown in FIG. 3 are laminated and integrated on both sides of the synthetic resin sheet 14, which is the same as that shown in FIG. 3, to form a treated sheet 17.

In the treated sheets 13 and 17 shown in FIGS. 3 and 4, the synthetic resin sheets 12 and 14 are similar to the fabrics 11 and 15.
, 16, it may be in the form of a thin film, or a treated sheet may be formed by coating the fabrics 11, 15 or 16 with a synthetic resin.

[0034]In addition, since industrial waste may exhibit strong acidity or strong alkalinity, the treatment sheets 7, 13, 17
Therefore, it needs to be highly chemical resistant.

[0035]

Effects of the Invention According to the invention of claim 1, the treatment sheet can be applied to the surface of the waste layer, whether it is landfilling waste in inland areas or directly dumping incinerated ash on the coast. Landfill treatment is completed just by laying and covering with soil, which has the effect of saving labor in construction work.

[0036] Moreover, the above construction alone can prevent the infiltration of rainwater, and various gases generated from the waste are naturally released into the atmosphere through the treatment sheet and soil covering, so it is possible to install a treatment facility for leaching caused by the infiltration of rainwater. , there is no need to install a gas venting structure, and there is also the effect that construction costs and facility operation costs can be completely eliminated.

[0037] Furthermore, since it is not necessary to install gas venting pipes, etc., the appearance of the reclaimed site is improved, there are fewer restrictions on the use of the site, and it is possible to suppress the occurrence of anxiety and abnormal odors when using the site, etc. It also has

According to the second aspect of the invention, if the thickness of the soil covering layer is the same as in normal waste landfill processing, even if rainwater permeates into the soil covering layer during rainfall and the water pressure acts on the treatment sheet, the waste will not be disposed of. This has the effect of preventing rainwater from penetrating into the layer and allowing gas generated from the waste layer to be released to the ground surface.

According to the invention of claim 3, even if uneven settling of the waste layer occurs, contact with a working machine during laying, or contact with protrusions in the waste, the waste layer does not easily break. There is an effect that a treated sheet can be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing a state in which landfill processing is completed.

FIG. 2 is a reduced plan view of a portion of the processing sheet used.

FIG. 3 is a schematic vertical cross-sectional view of an example of a treated sheet.

FIG. 4 is a schematic vertical cross-sectional view of another example of a treated sheet.

[Explanation of symbols]

2 Waste 3 Foundation ground 5 Waste layer 6　Full surface 7, 13, 17 Processing sheet 8 Covering soil 12, 14 Synthetic resin sheet 11,15,16 Fabric

Claims (3)

[Claims] Claim 1: A suitable number of locations that are waterproof and are distributed at least approximately evenly over the entire surface are placed on the foundation ground using a sheet that is both waterproof and breathable. A method for landfilling waste, which comprises covering the entire surface of the accumulated waste and then covering the sheet with soil. 2. A treatment sheet for covering waste, which has waterproofness with a water pressure resistance of 30 cm or more in the water column and air permeability with an air permeability of 0.01 cc/cm2·sec or more. 3. The treatment sheet for covering waste according to claim 2, wherein a breathable protective fabric is laminated on at least one surface of the waterproof and breathable synthetic resin sheet.