JPH11277022A - Waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leachate from staying in a disposal site by a method wherein after a roof for preventing rain water from entering into the disposal site, water is sprinkled on waste and the leachate in the waste based on this water sprinkling is drained outward from the bottom part of the disposal site. SOLUTION: A dome-shaped roof 90 with such an area that covers a disposal site 30 is provided and water sprinklers 90b are extended lengthwise and breadthwise on the inside of this roof 90 and an appropriate amt. of water is jetted from nozzles 90c of these sprinklers 90b to sprinkle the water on waste 40. The sprinkled water is turned into leachate in the waste 40 and this leachate is passed through passage holes from a filter layer and is stored in a leachate storing part 32 between a plurality of reinforcing plates and then, the leachate is once stored on the bottom part of a drain hole 34 from a leachate guide pipe 33 and it is drained by one step therefrom to a water treatment facility 36 by means of a pump and clarification treatment thereof is performed in the water treatment facility 36 and the treated water is discharged. It is possible thereby to prevent the leachate from being stored and being retained in the disposal site 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waste disposal site,
In particular, the present invention relates to a structure for quickly discharging leachate.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 11 and 12, a waste disposal site 1 for accumulating industrial waste and household waste is formed by excavating and forming a ground 2 in a concave shape, and further constructing a concrete wall 3. And the like.

[0003] A water-impervious sheet 5 usually made of a double sheet is laid on almost the entire surface of the bottom portion 4.
A plurality of leachate collection / drainage channels 6 are provided on the top, and a plurality of branch leachate collection / drainage channels 7 are connected to the leachate collection / drainage channel 6. Of the branch leachate collection and drainage channel 7, a leading end of the drainage channel 7 located outside communicates with the drainage channel 7 and extends a gas release channel 9 along the inclined surface 8. In addition, a plurality of groundwater collecting and draining channels 10 and a branch groundwater collecting and draining channel (not shown) connected to the drainage channels 10 are provided on the lower surface side of the waterproof sheet 5.

On the side of the waste disposal site 1, a small leachate storage unit 11 is provided. The leachate from the leachate collection / drainage channel 6 is stored in the leachate storage unit 11 via the leachate guide pipe 12, and then discharged to the outside via a pump (not shown) for purification treatment. A groundwater reservoir 13 is provided on the side of the waste disposal site 1, and the groundwater from the groundwater collection and drainage channel 10 is stored in the groundwater reservoir 13 via the groundwater guideway 14. It is discharged outside through a pump (not shown) and processed.

As shown in FIGS. 13 and 14, the leachate collection / drainage channel 6 is provided with a collection / drainage pipe 6a having a large number of holes on its outer periphery.
b, and its surroundings are filled with a filter material 6c such as crushed stone. A protective material 15 such as sand or gravel is provided on the impermeable sheet 5. In addition, the above-mentioned groundwater collecting drainage channel 10
Is a water collecting and draining pipe 10a having a large number of holes on its outer periphery.
, And its surroundings are filled with a filter material 10c such as crushed stone and covered with a lid material 10d.

[0006] In the above configuration, the disposal site 1 accommodates 1 m of waste, and the leachate a due to the rainwater or the liquid component exuded from the 1 m of waste has a constant water pressure P inside. The leachate a that is retained and seeps out of such waste or contains contaminants as rainwater passes through the waste migrates toward the bottom 4,
Since it is blocked by the water-blocking sheet 5, it does not leak into the bottom 4 and penetrate. The leachate a enters the drainage pipe 6a through a plurality of holes of the drainage pipe 6a via the filter material 6c, and after being collected, the leachate is stored through the leachate guide pipe 12. The water is drained and stored in the unit 11, and then discharged by a pump (not shown), and then purified and processed. Gas generated from waste is also supplied to the collection / drainage pipe 6a, and is discharged to the outside through the gas release path 9.

The underground groundwater b at the bottom 4 enters the drainage pipe 10a through a plurality of holes in the drainage pipe 10a via the filter material 10c, and after being collected, the guide pipe 1
4 and is stored in the groundwater storage unit 13 and then discharged by a pump (not shown).

[0008]

However, conventionally, the leachate collection drainage channel 6, the groundwater collection drainage channel 10 and the like are not provided with the concave portions 6b, 10
Since the discharge pipes 6a and 10a of a predetermined length are joined together in b, and formed by filling them with filter materials 6c and 10c, they have the following disadvantages.

That is, the self-decomposition of waste is promoted,
In order to prevent the leachate a from leaking, it is important that the leachate a be quickly discharged and that the leachate a be not stored in the waste layer for a long period of time. In collecting and draining water, since the leachate guide pipe 12 has a small diameter and the leachate storage unit 11 is small, the drainage capacity is small, and as a result, leachate stays in the disposal site for a long time, There was a problem in obtaining a safe storage function and a quick purification function.

[0010] A waste management type final disposal site has a "safe storage function" for properly storing waste and a "rapid purification" for stabilizing and detoxifying waste using the metabolic function of nature. Function is required. In order to realize safe storage and early stabilization of waste, leachate should not be stored and retained in the landfill, preventing leakage of leachate, suppressing deterioration of leachate quality,
It is important to promote the natural purification action of waste.
However, in conventional disposal sites, the method of temporarily storing leachate in landfills is generally used due to the relationship between the expected safety during maximum precipitation and the scale of water treatment facilities. There was a concern about the effect on each function required for.

In particular, if the leachate is retained in the disposal site with a large water pressure P during precipitation, the water pressure breaks the impermeable sheet and leaks, so that a safe storage function cannot be obtained. Since the leachate was retained for a long period of time, a rapid purification function could not be obtained.

[0012] The present invention prevents leachate from being stored and retained in a disposal site.

[0013]

According to the first aspect of the present invention, a roof is provided on which rainwater does not enter the disposal site, water is sprayed on the waste, and leachate in the waste based on the water spray is disposed of. Drain the water from the bottom of the site to the outside.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 to FIG. 4 are views showing one embodiment of a waste disposal site according to the present invention. In each figure, the waste disposal site 30 excavates the ground surface to accommodate a large amount of waste. It is a concave disposal site that can be formed and has an inverted frustum shape. The inner peripheral surface is inclined, and a step portion 31 is provided, and a leachate storage portion 32 is provided on the bottom surface. The waste disposal site 30 is surrounded by a concrete wall 30 m.

The leaching water accommodating portion 32 is basically constructed of a concrete structure having high strength and high water blocking properties. As shown in FIGS. 3 and 4, a rising plate 32b is provided on the outer periphery of a bottom plate 32a. A concave plate 32c is provided. The concave plate 32c is covered with a cover plate 32e having a through hole 32d, and a reinforcing plate 32f is erected between the bottom plate 32a and the cover plate 32e so as to sufficiently withstand heavy pressure. You.

An opening 32g corresponding to one end of the reinforcing plate 32f in the leaching water accommodating portion 32 is closed, and a plurality of openings 32g at the other end are formed into a longitudinal cylindrical water collecting portion 3 as shown in FIG.
2h, and the water collecting portion 32h is connected to the leachate guide pipe 3
3 is connected to the lower end of the drain hole 34.

On the cover plate 32e, a filter layer 41 such as gravel or gallstone is deposited with a constant thickness.
Further, a conventional groundwater collection and drainage channel 10 is provided further below the leachate storage unit 32.

Reference numeral 35 denotes a gas vent pipe which stands vertically from the cover plate 32e to near the surface of the ground, and has a lower end penetrating the cover plate 32e.

The drainage hole 34 has a ladder 38 for an operator to enter and inspect, and a pump 34a serving as a discharging means is located at the bottom of the ladder 38.
Is discharged and discharged after being treated in a water treatment facility 36 through a discharge pipe 34b such as a hose.

Reference numeral 90 denotes a dome-shaped roof, which is large enough to cover the disposal site 30 and is supported by columns 90a to prevent rainwater u from entering the disposal site. A sprinkling pipe 90b is stretched vertically and horizontally inside the roof 90, and an appropriate amount of water is blown out from a nozzle 90c of the sprinkling pipe 90b to be sprinkled on the waste 40.

A water tank 90d is located outside the concrete wall 30m. The water tank 90d contains the water treatment equipment 36, rainwater u, and groundwater from the groundwater pump 90e. The water inside is pump 9
At 0f, the water is sent to the water sprinkling tube 90b via the valve 90g, and water is sprinkled from the nozzle 90c. The water-blocking sheet 5a made of rubber or synthetic rubber is attached to the inclined surface on which the step portion 31 is formed, and the lower end is connected to the outer periphery of the leachate storage portion 32. Although the bottom portion of the water shielding sheet 5a is omitted, the water shielding sheet 5a may be provided so as to cover the lower surface of the seepage water storage portion 32. 30x is a rainwater collecting drain.

In such a configuration, the waste 40 is deposited in a layered manner in the treatment plant 30. In this process, the degassing pipe 35 is extended upward and the waste 40 is deposited at a certain thickness. The cover soil 37 is covered in layers. The waste 40 is stored by repeating the accumulation of the waste 40 and the accumulation of the covering soil 37.

The air flow from the drain hole 34 due to natural ventilation flows upward from the leachate guide pipe 33 through the gas release pipe 35. At this time, the gas in the leachate water accommodating portion 32 passes through the gas release pipe 35. After that, it is exhausted to the outside.

In the present embodiment, the valve 90g is opened, the water in the water storage tank 90d is sent out to the water sprinkling pipe 90b by the pump 90f, and is spouted out from the nozzle 90c, so that an appropriately controlled amount of water (waste 40 is washed out). The amount of water required to drop impurities into the leachate storage unit 32) can be sprayed on the waste 40. The sprinkled water becomes leachate in the waste 40. The leachate in the waste 40 passes from the filter layer 41 through the through hole 32d,
After being stored in the passage 42 between the plurality of reinforcing plates 32f, the water is temporarily stored in the bottom of the drainage hole 34 from the leachate guide pipe 33 through the water collecting part 32h from the opening 32g, and from there to the water treatment equipment 36 by the pump 34a. The water is discharged at once, purified by the water treatment facility 36, and discharged.

As described above, the leachate is obtained by properly controlled watering, so that the leachate does not stay in the waste disposal site 30, but rather leaches between the wastes 40 and collects the leachate at once. It descends into the part 32.

The amount of leachate is set to an appropriate amount by adjusting the opening amount of the valve 90g.
Since there is no stagnation in the inside, and no water pressure is generated, leakage of leachate can be suppressed as much as possible. In addition, since the leachate drops rapidly between the wastes 40, an effect of washing out the wastes by the leachate can be expected.

That is, the following effects can be obtained. a. Since the amount of water spray is adjusted, the amount of leachate can be set extremely small, so that the risk of leakage of leachate is reduced and the treatment capacity of the water treatment equipment is reduced. b. By setting the most effective watering amount and chemical for each target waste, the purification action of the waste using water as a medium is stably promoted. It is also possible to respond flexibly to future changes in the composition of waste. c. The circulation system that reuses the treated water for watering can suppress the discharge of treated water to the outside of the system and reduce the load on the surrounding environment. d. Even in the event of an unexpected event, such as a large amount of rainwater entering a landfill site due to a storm or the like, it is safe because a water treatment facility is provided. e. The cover during reclamation prevents the reclamation work from being affected by the weather, prevents dust and the like from being scattered around the reclamation work, and improves the landscape.

Embodiment 2 As shown in FIG. 5, when the surroundings of the waste disposal site 30 are surrounded by a concrete wall 30 m, the inclined tunnel 51 as a drainage means is extended from the lower part of the drainage hole 34 to the outside of the wall 50. Alternatively, the leachate may be guided to the water treatment facility 36.
According to this, the pump 34a can be made unnecessary. The water from the water treatment facility 36 is discharged to the water storage tank 90d by the pump 36f.

Embodiment 3 Also, as shown in FIG.
If the size of the waste disposal site 30 is relatively small,
The leachate storage unit 32 having one passage 42 may be provided.

Embodiment 4 In addition, a resin tube 70 made of vinyl chloride or the like having a hole 70a on the side as shown in FIGS. According to this, the durability of the leaching water accommodating portion 32 is increased with respect to the pressure from above, and the leaching water is accommodated in the resin pipe 70, so that the accommodation capacity is not reduced. In this case, the reinforcing plate 32f and the lid plate 32e may be removed.

Embodiment 5 As shown in FIG. 9, in place of the resin pipe 70, unnecessary hollow bodies 70m such as cut ends of the resin pipe are randomly arranged in the leachate storage section 32 as shown in FIG. Even if it is inserted and installed, the leachate storage unit 32 having high durability can be obtained as in the fourth embodiment. Also in this case, the reinforcing plate 32f may be omitted.

In the present invention, since the amount of water sprinkling is controlled to an appropriate amount, it is not necessary to use a large leachate storage function at the bottom of the disposal site. It may be.

The roof 90 is not limited to a fixed type, but may be a sliding type or a tent, which may have a bellows structure, and may be opened and closed by sliding on rails.

[0034]

According to the first aspect, since leachate is obtained by sprinkling an appropriate amount of water onto waste while covering the waste disposal site with a roof, a large amount of leachate is disposed. Since the water does not stay in the site and large water pressure is not generated by the leachate, the leachate can be prevented from leaking and a safe storage function can be obtained.Moreover, since the leachate quickly descends to the bottom of the disposal site, The effect of washing out waste can be expected and a quick purification function can be expected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 4 is a perspective view of an essential part showing one embodiment of the present invention.

FIG. 5 is a cross-sectional view of a principal part showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a principal part showing another embodiment of the present invention.

FIG. 8 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 9 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 10 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 11 is a cross-sectional view illustrating an example of a conventional waste treatment plant.

FIG. 12 is a plan view showing an example of a conventional waste disposal plant.

FIG. 13 is a sectional view of a main part showing an example of a conventional waste treatment plant.

FIG. 14 is a sectional view of a main part showing an example of a conventional waste disposal plant.

[Explanation of symbols]

30 waste disposal site, 32 leachate storage unit, 90 roof, 90a prop, 90b watering pipe, 90c nozzle,
90d water tank, 90e groundwater pump, 90f pump, 90g valve.

Claims (1)

[Claims] In a waste disposal site for storing waste, water is sprayed on the waste while covering the disposal site with a roof, and leachate in the waste based on the watering is discharged to the bottom of the disposal site. A waste disposal site characterized by draining water from the outside to the outside by means of drainage.