JP3847446B2 - Waste disposal site - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste disposal site, and more particularly to a structure for quickly draining leachate.
[0002]
[Prior art]
Conventionally, a waste disposal site 1 for accumulating industrial waste and domestic waste is formed by excavating and forming the ground 2 into a concave shape as shown in FIGS. ing.
[0003]
The bottom portion 4 is usually provided with a water shielding sheet 5 composed of a double sheet on almost the entire surface, and a plurality of leachate collecting and draining channels 6 are provided on the water shielding sheet 5. A plurality of branch leachate water collection and drainage channels 7 are connected to. Out of the branch leachate collection drainage channel 7, the branch leachate collection drainage channel 7 located on the outside communicates with the branch leachate collection drainage channel 7, and a gas vent channel 9 extending along the inclined surface 8 extends. .
In addition, a plurality of groundwater collection drainage channels 10 and a branch groundwater collection drainage channel (not shown) connected to the groundwater drainage channels 10 are provided on the lower surface side of the water shielding sheet 5.
[0004]
A small leachate storage part 11 is provided on the side of the waste disposal site 1. The leachate storage section 11 stores leachate from the leachate collection / drainage channel 6 via the leachate guide pipe 12 and then discharges it to the outside via a pump (not shown) for purification. In addition, a groundwater storage unit 13 is provided at the side of the waste disposal site 1, and groundwater from the groundwater collection and drainage channel 10 is stored in the groundwater storage unit 13 through the groundwater guide channel 14. It is discharged outside through a pump (not shown) and processed.
[0005]
As shown in FIGS. 13 and 14, the leachate collection / drainage channel 6 is constructed by installing a collection / drainage pipe 6a having a large number of holes on the outer periphery in a recess 6b and filling the periphery with a filter material 6c such as crushed stone. . A protective material 15 such as sand or gravel is provided on the water shielding sheet 5.
The groundwater collection / drainage channel 10 is configured by installing a collection / drainage pipe 10a having a large number of holes on the outer periphery in a recess 10b, filling the periphery with a filter material 10c such as crushed stone, and covering with a lid 10d.
[0006]
In the above configuration, 1m of waste is stored in the disposal site 1, but rainwater or leachate a due to the liquid component exuded from the waste 1m is retained in the disposal site 1 with a constant water pressure P, The leachate a which exudes from such waste or the rainwater passes through the waste and contains contaminants moves in the direction of the bottom 4, but is blocked by the water shielding sheet 5, It does not leak into the ground of the bottom part 4 and penetrate.
This leachate a enters the drainage pipe 6a via the filter material 6c through the plurality of holes of the drainage pipe 6a, and after being collected, the leachate is stored via the leachate guide pipe 12. After being drained and stored in the section 11 and then discharged by a pump not shown, it is purified and processed. A gas generated from the waste is also supplied to the drainage pipe 6a, but this is discharged to the outside through the gas vent passage 9.
[0007]
The underground water b in the ground at the bottom 4 enters the drainage pipe 10a through the filter material 10c through the plurality of holes of the drainage pipe 10a, collects the water, and then stores the groundwater through the guide pipe 14. It is stored in the part 13 and then discharged by a pump not shown.
[0008]
[Problems to be solved by the invention]
However, conventionally, the leachate collection drainage channel 6, the groundwater collection drainage channel 10 and the like are formed by joining discharge pipes 6a and 10a having a predetermined length in the recesses 6b and 10b and filling them with filter materials 6c and 10c. Therefore, it has the following disadvantages.
[0009]
That is, in order to promote the self-decomposition of the waste and not to leak the leachate a, it is important that the leachate a is quickly discharged and the leachate a is not stored in the waste layer for a long time. In the leachate collection and drainage by the leachate collection and drainage channels 6 and 7, the leachate guide pipe 12 has a small diameter and the leachate storage part 11 is small, so the drainage capacity is small. As a result of water staying in the disposal site for a long time, there was a problem in obtaining a safe storage function and a quick purification function.
[0010]
The waste management-type final disposal site has a “safe storage function” for appropriately storing waste, and a “rapid purification function” for stabilizing and detoxifying waste using the metabolic function of nature. is necessary.
In order to realize safe storage and early stabilization of waste, it is necessary to prevent leakage of leachate, prevent deterioration of leachate quality, and promote natural purification of waste without storing and retaining leachate in landfills. It is important to plan.
However, in conventional disposal sites, the method of temporarily storing leachate in landfills is generally used due to the safety of predicted maximum precipitation and the size of water treatment facilities. There were concerns about the impact on each required function.
[0011]
In particular, if the leachate stays in the disposal site with a large water pressure P during precipitation, it will break through the impermeable sheet with this water pressure, and a safe storage function will not be obtained. Since water was retained, a rapid purification function could not be obtained.
[0012]
The present invention is a disposal site structural system for preventing leachate from being stored and staying in a disposal site and for separating waste and leachate as quickly as possible.
[0013]
[Means for Solving the Problems]
According to the first aspect, the leachate storage portion for storing the leachate is provided on the bottom surface of the disposal site , the leachate storage portion includes the concave body and the lid plate that covers the concave body, and the lid plate has a through hole. Provided, a filter layer is provided on the cover plate, and a drainage means for forcibly draining the leachate stored in the leachate storage part through the filter layer and the through hole to the outside of the disposal site is provided. .
[0014]
According to claim 2, the volume of the leachate storage part is 5 to 15% of the volume of the waste storage part of the disposal site.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 to 4 are diagrams showing an 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 has an inverted trapezoidal shape, and its inner peripheral surface is inclined and a step portion 31 is provided, and a leachate storage portion 32 is provided on the bottom surface thereof. The area around the waste disposal site 30 is surrounded by 30m of concrete fences.
[0016]
The leachate storage portion 32 is basically constructed of a concrete structure having high strength and water-blocking properties, and as shown in FIGS. 3 and 4, a concave body 32c formed by providing a rising plate 32b on the outer periphery of the bottom plate 32a. The concave body 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 that it can sufficiently withstand heavy pressure.
[0017]
The opening 32g corresponding to one end side of the reinforcing plate 32f in the leachate housing portion 32 is closed, and the plurality of openings 32g on the other end side are connected to a longitudinal cylindrical water collecting portion 32h as shown in FIG. The water collecting portion 32 h is connected to the lower end side of the drainage hole 34 via the leaching water guide tube 33. The entire volume of the leachate storage part 32 is set to 5 to 15%, preferably 7 to 10% of the volume of the waste disposal site 30 itself (the part above the leachate storage part 32). .
[0018]
A filter layer 41 such as gravel or grits is deposited with a certain thickness on the lid plate 32e, and the conventional groundwater collection and drainage channel 10 is further below the leachate storage portion 32. Provided.
[0019]
A gas vent pipe 35 stands vertically from the lid plate 32e to near the ground surface, and the lower end penetrates the lid plate 32e.
[0020]
The drainage hole 34 has a ladder 38 for an operator to enter and inspect, and a pump 34a as a discharge means is located at the bottom of the ladder, and the leachate drained by the pump 34a is a hose or the like. After being treated by the water treatment facility 36 via the discharge pipe 34b, it is discharged and discharged.
A water shielding sheet 48 is provided along the inclined surface in the disposal site. A rainwater collecting / draining groove 49 is provided on the ground surface.
[0021]
In such a configuration, the waste 40 is deposited in layers in the treatment plant 30. In this process, the degassing pipe 35 is extended upward, and the covering soil 37 is deposited where the degassing pipe 35 is deposited to a certain thickness. Is layered. The waste 40 is accommodated by repeating the accumulation of the waste 40 and the deposition of the cover soil 37.
[0022]
The air flow by natural ventilation from the drain hole 34 is vented upward from the leaching water guide pipe 33 through the gas vent pipe 35, and at this time, the gas in the leaching water storage portion 32 passes outside through the gas vent pipe 35. It will be exhausted.
[0023]
In the present embodiment, the leachate in the waste 40 is leached from the filter layer 41 through the through hole 32d and into the passage 42 between the plurality of reinforcing plates 32f, and then from the opening 32g through the water collecting portion 32h. It is temporarily stored from the water guide pipe 33 to the bottom of the drainage hole 34, and then drained all at once to the water treatment facility 36 by the pump 34a, purified by the water treatment facility 36, and discharged.
[0024]
Thus, since the leachate storage part 32 which can accommodate a considerable amount of leachate is provided, even if the leachate tends to stay in the treatment plant 30 during the maximum rainfall, the leachate is stored in the leachate storage part 32. However, since it is drained by the pump 34a, the leachate does not stay in the treatment plant 30, but falls between the wastes 40 and falls into the leachate storage part 32 all at once.
[0025]
Therefore, since the water pressure based on a large amount of leachate remaining in the waste does not occur, leakage of leachate can be suppressed as much as possible. In addition, based on the fact that the leachate falls between the wastes 40 and falls rapidly, the waste washing effect by the leachate can be expected.
[0026]
That is, the following effects can be obtained.
a. As described above, since the leachate pressure that causes leachate leakage does not occur, the risk of leachate leakage is reduced.
b. The underground leachate storage part 32 that constitutes the bottom of the landfill is based on a concrete structure with high strength and water-imperviousness that is adopted in the interception-type disposal site. Compared to the above, the safety and reliability of the impervious work are improved.
c. Since the amount of treated water can be adjusted by the leachate storage part 32, the treatment capacity of the water treatment facility is reduced.
d. By separating waste and leachate quickly, purification by waste washing effect is promoted, deterioration of leachate quality is suppressed, environmental pollution risk is reduced, and load on water treatment facilities is reduced. .
e. The natural purification action of the waste is promoted by the expansion of the aerobic region in the waste layer by not storing leachate internally and the increase of the ventilation area by the underground storage tank. As a result, it is possible to shorten the period until full-scale use of the site.
f. By setting the arrangement of the underground leachate storage portion 32 and the partition by the reinforcing plate 32f for each leachate collection area, it is possible to perform land reclamation that is effective in reducing the amount of treated water and is highly safe.
g. The soundness of the leachate storage part 32 in the basement can be confirmed by visual observation using its internal space, and a reliable repair and confirmation of the repair effect can be directly performed.
h. Since the entire and part of the landfill bottom is effectively used as leachate storage space, it is not necessary to install a large scale leachate adjustment tank outside the landfill.
i. Since the underground leachate storage part 32 itself has a leachate collection and drainage function, it is not necessary to install a conventional leachate collection and distribution pipe.
j. Since the leachate is not stored internally, it can be judged that it is not necessary to secure the slope of the leachate accumulation part (slower than 1: 2) as shown in the new standard, and there are few topographical restrictions in setting up the disposal site Become.
k. Since the leachate is not stored internally, it can be judged that the slope-impervious work such as the double sheet structure shown in the new standard is unnecessary, and the method using the single sheet structure that is applied when there is no risk of the leachate remaining. Adoption of surface impermeable work becomes possible.
[0027]
In particular, in the present embodiment, the volume of the leachate storage unit 32 is 5 to 15%, preferably about 7 to 10%, of the volume of the waste disposal site 30 itself. 32 having a minimum size, and having a capacity capable of quickly draining a large volume of leachate expected to be accommodated in the waste disposal site 30 during the maximum rainfall, The capacity of leachate can be increased while reducing the burden of 32 construction costs.
That is, the larger the volume of the leachate storage portion 32, the better in terms of drainage of leachate, but this incurs a construction cost burden, so it is the minimum size necessary for sufficient drainage. Good.
[0028]
Embodiment 2. FIG.
As shown in FIG. 5, when the waste disposal site 30 is surrounded by a concrete wall 30 m, an inclined tunnel 51 as a drainage means is extended from the lower part of the drainage hole 34 to the outside of the wall part 50. The leachate may be guided to the water treatment facility 36.
According to this, the pump 34a can be made unnecessary.
[0029]
Embodiment 3 FIG.
In addition, as shown in FIG. 6, when the size of the waste disposal site 30 is relatively small, a leachate containing part 32 having one passage 42 may be provided. In this case as well, the size of the leachate storage portion 32 is set to 5 to 15%, preferably about 7 to 10% of the volume of the waste disposal site 30, because of the relationship between the treatment capacity and the economic burden of construction. Is done.
[0030]
Embodiment 4 FIG.
Further, a resin tube 70 made of vinyl chloride or the like having a hole 70a in the side portion as shown in FIGS.
According to this, the durability of the leachate storage portion 32 is increased with respect to the pressure from above, and the leachate is stored in the resin pipe 70, so that the storage capacity is not reduced. In this case, the reinforcing plate 32f and the cover plate 32e may be removed.
[0031]
Embodiment 5
In place of the resin pipe 70, the hollow bodies 70m that are no longer required, such as a cut end of the resin pipe as shown in FIG. 9, are randomly arranged in the leachable water storage part 32 as shown in FIG. Even if it is put in and installed, the leachate containing portion 32 having high durability can be obtained as in the fourth embodiment.
[0032]
【The invention's effect】
According to claim 1, provided with leachate storage portion for storing leachate to the bottom surface of the disposal site, comprising leachate containing portion and a cover plate for covering the concave body and the concave body, the cover plate through hole Waste disposal site provided with a drainage means for forcibly draining the leachate stored in the leachate storage section through the filter layer and through-holes to the outside of the disposal site since was, to fall to the leachate rapidly leachate containing portion staying with waste disposal hall, since it is drained to the outside through the draining means from which the leachate does not stay in the waste Therefore, the water pressure due to the leachate does not occur, which can prevent the leachate from leaking out and obtain the washing out effect of the waste by the leachate quickly falling to the bottom through the waste. Have various effects that can promote purification.
[0033]
According to claim 2, since the volume of the leachate storage part is 5 to 15% of the volume of the waste storage part of the waste disposal site, the leachate is quickly drained from the volume of the leachate storage part. Therefore, it is possible to obtain a waste disposal site with an excellent processing capacity without increasing the construction cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention.
FIG. 2 is a cross-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 a main part showing an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main 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 main 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 showing an example of a conventional waste disposal site.
FIG. 12 is a plan view showing an example of a conventional waste disposal site.
FIG. 13 is a cross-sectional view showing an example of a conventional waste disposal site.
FIG. 14 is a sectional view of an essential part showing an example of a conventional waste disposal site.
[Explanation of symbols]
30 waste disposal site, 32 leachate storage part, 32a bottom plate, 32b rising plate, 32c concave body, 32d through-hole, 32e cover plate, 32f reinforcing plate, 32g opening, 32h water collecting part, 33 leachate guide pipe, 34 drainage Hall, 35 venting pipe, 36 water treatment facility, 41 filter layer, 42 passage.

Claims (2)

In a waste disposal site provided with a concave recess for storing waste, a leachate storage portion for storing leachate is provided on the bottom of the disposal site, and the leachate storage portion is covered with the concave body and the concave body. Drainage that forcibly drains the leachate stored in the leachate storage section through the filter layer and the through-hole, and the cover plate is provided with a through-hole, and the filter plate is provided on the cover plate. Waste disposal site characterized in that means are provided . The waste disposal site according to claim 1, wherein the volume of the leachate storage unit is 5 to 15% of the volume of the waste storage unit of the disposal site.

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