JPH0975885A - Leachate leakage monitoring system for waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely and quickly sense the leakage of leachate by laying first to third sheet components on a ground surface of a waste disposal site, dividing leaking layers formed among respective sheet components into a plurality and installing a leachate monitoring means in a leachate pipe for collecting the leachate leaked onto the sheet components for respective leaking layers. SOLUTION: First to third sheet components 18, 20 and 22 are laid on a waste disposal ground surface 12 of a waste disposal site 2 successively in order from the lower side. For the purpose of dealing with the damages to the sheet components 18-22, lower and upper leakage monitoring pits 40 and 46 and an underground water monitoring pit 52 are provided. In the case, for instance, the third sheet component 22 of any one of upper side first to upper side eleventh leaking layers 26 is damaged and the leachate is leaked from the wastes onto the leaking layer 26, the leachate is flowed on the second sheet component 20 to the lowest site side. Then the leachate is flowed down from an upper inlet 36 to the upper leakage monitoring pit 46 by an upper leachate pipe 44, and the damage to the sheet component 22 is sensed by monitoring the leachate in the monitoring pit 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leachate leakage monitoring system for a waste disposal site, and in particular, it is possible to reliably and quickly detect leakage of leachate from waste and to quickly and surely identify the location of leakage. The present invention relates to a leachate leakage monitoring system for a waste disposal site, which can be identified and can easily respond when a leak is detected.

[0002]

2. Description of the Related Art In recent years, with the centralization of artificial cities, there is a strong demand for a method of disposing of waste such as garbage discharged from cities. Particularly in the suburbs of the city, it is difficult to secure a disposal site, and it is necessary to develop a new disposal site.

[0003]

By the way, some conventional waste disposal sites utilize, for example, the slope of a valley between mountains. As a waste disposal site, a weir is formed in the downstream part of the valley, and a disposal ground for accommodating waste is created in the upstream part of the weir, or it is dug out entirely to create a water-impervious sheet. There is one that is laid and the waste is stored on this water-blocking sheet.

However, in the conventional waste disposal site, when the water-blocking sheet containing the waste material is damaged, the leachate from the waste material leaks from the damaged portion and penetrates into the ground of the storage ground to cause groundwater. There is the inconvenience that there is a risk of causing environmental pollution such as the pollution of forests and the surrounding forests.

Further, in the conventional waste disposal site, it is structurally impossible to detect whether or not the seepage sheet is damaged and the leachate from the waste is leaking, and improvement is desired. Was there.

Furthermore, in the conventional waste disposal site,
There is an inconvenience that the location of leakage of leachate from waste cannot be specified. In order to identify the leakage location, it is necessary to remove the waste from the waste disposal site once, search for the damaged part of the impermeable sheet, and repair it, which is a problem that requires large-scale work. .

[0007]

In order to eliminate such inconvenience, the present invention lays at least first to third sheet members in sequence from the lower side on the ground of the disposal site of the waste disposal site, A lower leakage layer is formed and provided between the first and second sheet members, and the lower leakage layer is divided into a plurality of portions, and an upper leakage layer is formed and provided between the second and third sheet members. Along with this, the upper side leakage layer is divided into a plurality of sections, and the first sheet member for each of the lower side leakage layers is formed with a lower side water collecting port for collecting the leachate leaked from the second sheet member. The third sheet on the second sheet member for each upper leakage layer
Upper water collecting ports for collecting the leachate leaked from the sheet member are formed respectively, and lower leachate pipes communicating one end side to the lower water collecting ports of each of the lower leak layers are provided, and each of these lower leachates is also provided. A lower leachate monitoring means is provided which communicates with the other end of each water pipe, and an upper leachate pipe communicating with one end of each of the upper leakage layers is provided with an upper leachate pipe of each of the upper leachate pipes. An upper leachate monitoring means communicated with the end side is provided, and a ground water pipe is provided to branch and open one end side over the entire area of the ground of the disposal site where the first to third sheet members are laid and to collect these ground water pipes. It is characterized in that a groundwater monitoring means is provided which communicates with the other end of the groundwater.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the leachate leakage monitoring system for a waste disposal site according to the present invention, at least the first to third sheet members are laid on the ground of the disposal site, so that the leachate from the waste hardly leaks. It has a structure. In addition, the leachate leakage monitoring system collects leachate from the waste that has leaked to each upper leak layer divided into multiple parts through the upper water inlet of each upper leak layer, and monitors the upper leachate with the upper leachate pipe. By guiding to and monitoring the means, it is possible to detect which of the plurality of upper leakage layers is damaged by the third sheet member. Furthermore, the leachate monitoring system collects the leachate from the waste that has leaked into each of the lower leakage layers, which is divided into multiple sections, through the lower water inlet of each upper leakage layer, and the lower side through the lower leachate pipe. By guiding and monitoring the leachate monitoring means, it is possible to detect which of the plurality of lower leakage layers of the second sheet member is damaged.

Further, the leachate leakage monitoring system for a waste disposal site according to the present invention collects groundwater by a groundwater pipe branching and opening over the entire area of the disposal site ground where the first to third sheet members are laid, The damage to the first sheet member can be detected by guiding and monitoring the groundwater monitoring means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 12 show an embodiment of the present invention. 10 to 12, 2 is a waste disposal site,
Reference numeral 4 is a leachate leakage monitoring system. Waste disposal site 2
Is constructed using the slope of the valley 8 between the mountains 6 and 6.
The waste disposal site 2 forms a weir 10 at a downstream portion of the valley 8 and forms a depression-shaped disposal site ground 12 on the upstream side of the weir 10 in which waste is stored. The landfill ground 12 includes a bottom portion 14 and a slope portion 16.

The leachate leakage monitoring system 4 is shown in FIGS.
As shown in FIG. 9, at least the first to third sheet members 18 to 22 are laid in sequence from the bottom on the bottom surface portion 14 and the slope portion 16 of the ground 12 of the repository. First to third sheet members 1
8 to 22 are formed by alternately laminating a plurality of protective mats and water-blocking sheets and sticking them.

Between the first and second sheet members 18 and 20 and between the second and third sheet members 20 and 22, crushed stone or the like is laid, respectively, and the water-permeable lower leak layer 24 and the upper leak layer 26 are permeable.
Is formed and provided. Further, on the third sheet member 22, crushed stone or the like is laid to form a water-permeable protective layer 28.

The lower leakage layer 24 and the upper leakage layer 26
Are partitioned into a plurality of parts by the lower partition member 30 and the upper partition member 32, respectively. In this embodiment, as shown in FIG. 2, the lower leakage layer 24 is formed by the lower partition member 30 from the first lower leakage layer 24-1 to the lower eleventh leakage layer 24-1.
1, the upper leak layer 26 is partitioned by the upper partition member 32 into the upper first leak layer 26-1 to the upper eleventh leak layer 26-11.

The lower first to lower eleventh leakage layers 24-1
As shown in FIG. 2, the first sheet member 18 for each of 24 to 11 includes lower first to lower eleventh water collecting ports 34-1 to 34-1 to collect leachate of the waste material leaked from the second sheet member 20. 34-
11, the lower first to eleventh leak layers 24-1 to 24-
Each of the 11 points is formed at the lowest point.

The upper first to upper eleventh leakage layers 26-1
As shown in FIG. 4, the second sheet member 20 for each of the upper sheets 1 to 26-11 collects the leachate of the waste material leaked from the third sheet member 22, the upper first to upper eleventh water collecting ports 36-1 to 36-.
11, the upper first to eleventh leak layers 26-1 to 26-, respectively.
Each of the 11 points is formed at the lowest point.

The lower first to lower eleventh water collecting ports 34-1
To 34-11 include lower first to lower eleventh leachate pipes 38.
One end sides of -1 to 38-11 are provided so as to communicate with each other. The other end side of the lower first to lower eleventh leachate pipes 38-1 to 38-11 has a lower leak monitoring pit 4 which is a lower leachate monitoring means.
It is connected to 0. The lower leak monitoring pit 40
As shown in FIG. 3, the lower first to lower eleventh leachate pipes 38-
The leaked state of leachate is monitored by receiving leachate flowing down through 1 to 38-11.

The lower first to lower eleventh leachate pipes 38-
1 to 38-11 are collected in three groups, and lower first to third lower leachate pipe troughs 42-1 to 42-3, respectively.
And is guided to the lower leak monitoring pit 40.

The upper first to upper eleventh water collecting ports 36-1
To 36-11, upper first to upper eleventh leachate pipe 44
One end sides of -1 to 44-11 are provided in communication with each other. The other ends of the upper first to upper eleventh leachate pipes 44-1 to 44-11 have upper leakage monitoring pits 4 serving as upper leachate monitoring means.
It is provided in communication with 6. The upper leakage monitoring pit 46 is
As shown in FIG. 5, upper first to upper eleventh leachate pipes 44-
It receives the leachate flowing down through 1 to 44-11 and monitors the leakage state of the leachate.

The upper first to upper eleventh leachate pipes 44-
1 to 44-11 are collected into three groups, and upper troughs 48-1 to 48-3 for upper first to upper third leachate pipes, respectively.
And is guided to the upper leakage monitoring pit 46.

The leachate leakage monitoring system 4 is
As shown in FIGS. 1 and 5, the first to third sheet members 18 to 2
2, a groundwater pipe 50 is provided to branch and open on one end side over the entire area of the disposed landfill ground 12. The other end sides of these groundwater pipes 50 are provided so as to communicate with a groundwater monitoring pit 52 which is a groundwater monitoring means. The groundwater monitoring pit 52 monitors the leakage state of the leachate mixed with the groundwater.

The leachate leakage monitoring system 4 is
As shown in FIG. 1, a monitoring well 54 is excavated on the lowland side of the groundwater monitoring pit 52, and a water purification treatment facility 56 for purifying the leachate and the groundwater mixed with the leachate is provided.

Next, the operation will be described.

This leachate leakage monitoring system 4 is arranged on the ground 12 of the waste disposal site 2 in order from the bottom to the first to the third.
By laying the sheet members 18 to 22, the first
~ Even if the third sheet members 18 to 22 are damaged, the structure is such that the leachate from the waste hardly leaks.

This leachate leakage monitoring system 4 includes
In case of damage to the third sheet members 18 to 22, the leak state of the leachate is monitored by the lower leak monitoring pit 40, the upper leak monitoring pit 46, and the groundwater monitoring pit 52.

For example, the upper first leak layer 2 of the upper first to upper eleventh leak layers 26-1 to 26-11 divided into a plurality of sections.
When the third sheet member 22 of 6-1 is damaged or broken, the leachate from the waste leaks to the first leak layer 26-1. The leachate that has leaked to the upper first leaky layer 26-1 flows down to the lowest point side on the second sheet member 20 of the upper first leaky layer 26-1.

The leachate flowing down to the lowest point side on the second sheet member 20 of the upper first leak layer 26-1 is monitored from the upper first water collecting port 36-1 by the upper first leachate pipe 44-1 to monitor the upper leak. It flows down to pit 46. The manager of the waste disposal site 2 damages the third sheet member 22 of the upper first leak layer 26-1 by monitoring the leachate flowing out from the upper first leachate pipe 44-1 in the upper leak monitoring pit 46. Alternatively, it is possible to detect a break or the like.

Similarly, for example, the upper first side of the upper first to upper eleventh leak layers 24-1 to 24-11 divided into a plurality of sections.
When the second sheet member 20 of the leak layer 24-1 is damaged or ruptured, the lower side is monitored by monitoring the leachate flowing out from the lower first leachate pipe 38-1 in the lower leak monitoring pit 40. Second sheet member 20 of first leak layer 24-1
It is possible to detect damage, breakage, or the like.

In this way, the leachate leakage monitoring system 4
Are the first lower side communicated with the lower leakage monitoring pits 40, respectively.
~ By monitoring the leakage of the leachate from the lower eleventh leachate pipes 38-1 to 38-11, the plurality of lower first to lower eleventh leak layers 24-1 to 24-11 are divided. It can be detected which of the second sheet members 20 is damaged.

Further, the leachate leakage monitoring system 4 monitors the leakage of leachate from the upper first to upper eleventh leachate pipes 44-1 to 44-11 which are communicated with the upper leakage monitor pits 46, respectively. A plurality of partitioned upper first to upper eleventh leak layers 26-1 to 26-11
Which of the third sheet members 22 is damaged can be detected.

Further, this leachate leakage monitoring system 4
Collects groundwater through a groundwater pipe 50 that branches and opens on one end side over the entire area of the ground 12 where the first to third sheet members 18 to 22 are laid, and the groundwater monitoring pit 5
Leading to 2.

As a result, the manager of the waste disposal site 2 is
By inspecting and monitoring the water quality of the groundwater guided to the groundwater monitoring pit 52, it is possible to determine the mixing of the leachate into the groundwater. If leachate is mixed in,
Damage to the first sheet member 18 can be detected.

For this reason, the leachate leakage monitoring system 4 of the waste disposal site 2 includes the first to the first installations laid on the ground 12 of the disposal site.
The third sheet members 18 to 22 can more reliably prevent the leakage of the leachate from the waste, and even if the leachate from the waste leaks due to the damage of the first to the third sheet members 18 to 22, The lower leakage monitoring pit 40 and the upper leakage monitoring pit 46 can surely and swiftly detect the leak of the leachate, and can swiftly and surely specify the leaked place, and take a countermeasure when the leak is detected. Easy to do.

Further, the leachate leakage monitoring system 4 is
The leaked leachate can be prevented from flowing down and penetrating into the ground, which can prevent environmental pollution such as groundwater pollution and surrounding forest pollution. It is easy and practically advantageous.

Further, this leachate leakage monitoring system 4
Inspecting the water quality of the groundwater with the monitoring well 54 allows the groundwater monitoring to be combined with the leakage monitoring from the first to third sheet members 18 to 22. .

The leak water led to the lower leak monitoring pit 40 and the upper leak monitoring pit 46 is purified by the water purification treatment facility 56. Further, when leaked water is mixed in the groundwater guided to the groundwater monitoring pit 52, it is purified by the water purification treatment facility 56.

As a result, the leachate leakage monitoring system 4 can prevent environmental pollution due to leaked leachate or groundwater mixed with leachate.

[0038]

As described above, the leachate leakage monitoring system of the waste disposal site according to the present invention is the first system installed on the ground of the disposal site.
~ The third sheet member can more surely prevent the leakage of the leachate from the waste, and the lower leakage monitor and the upper leakage monitor can surely and swiftly detect the leakage of the leachate. It is possible to detect which of the third sheet members of each of the upper leakage layers is damaged, and which of the second sheet members of each of the lower leakage layers divided into a plurality is detected. be able to. Further, the leachate leakage monitoring system of the waste disposal site according to the present invention can detect damage to the first sheet member due to mixing of the leachate into the groundwater.

Therefore, the leachate leakage monitoring system of the waste disposal site can detect the leak of leachate from the waste reliably and quickly, and can quickly and surely identify the leaked place, and the leakage can be confirmed. It is possible to easily deal with the case where is detected.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a waste disposal site where a leachate leakage monitoring system according to an embodiment of the present invention is implemented.

FIG. 2 is a piping diagram of an upper leachate pipe.

FIG. 3 is a plan view of an upper leachate monitoring pit.

FIG. 4 is a piping diagram of a lower leachate pipe.

FIG. 5 is a plan view of a lower leachate monitoring pit.

FIG. 6 is a piping diagram of a groundwater pipe.

7 is an enlarged cross-sectional view taken along the line A of FIG.

8 is an enlarged cross-sectional view taken along the line B of FIG.

9 is an enlarged cross-sectional view taken along the line C of FIG.

FIG. 10 is a schematic plan view of a waste disposal site.

FIG. 11 is a schematic cross-sectional view of the waste disposal site from the upstream side to the downstream side.

FIG. 12 is a schematic cross-sectional view of the waste disposal site at a constant height.

[Explanation of symbols]

2 Waste disposal site 4 Leachate leakage monitoring system 6 Mountain 8 Valley 10 Weir 12 Disposal site ground 14 Bottom part 16 Slope part 18 1st sheet member 20 2nd sheet member 22 3rd sheet member 24-1 to 24-11 Bottom Side first leakage layer to lower eleventh leakage layer 26-1 to 26-11 Upper first leakage layer to upper eleventh leakage layer 28 Protective layer 30 Lower partition member 32 Upper partition member 34-1 to 34-11 Lower Side first to lower eleventh water collection port 36-1 to 36-11 Upper first to upper eleventh water collection port 38-1 to 38-11 Lower first to lower eleventh leachate pipe 40 Lower leakage monitoring pit 42-1 to 42-3 Lower first to lower third trough for leachate pipe 44-1 to 44-11 Upper first to upper eleventh leachate pipe 46 Upper leak monitoring pit 46 Groundwater pipe 48-1 to 48- 3 upper first to upper third leaching water pipe tiger 50 Groundwater pipe 52 Groundwater monitoring pit 54 Monitoring well 56 Water purification treatment facility

[Procedure amendment]

[Submission date] October 20, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

FIG. 6

FIG. 7

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

FIG.

Claims (1)

[Claims] 1. At least first to third sheet members are laid in order from the lower side on the ground of the disposal site of the waste disposal site, and a lower leakage layer is formed between the first and second sheet members. Along with the second leakage layer, the lower leakage layer is divided into a plurality of sections.
The upper leakage layer is formed between the third sheet members, and the upper leakage layer is divided into a plurality of portions, and the first sheet member of each lower leakage layer leaks from the second sheet member to the leachate. Lower water collecting ports for collecting water are formed respectively, and upper water collecting ports for collecting the leachate leaked from the third sheet member are formed for the second sheet members of the upper leakage layers, respectively. Each lower leakage port is provided with a lower leachate pipe communicating one end side with each lower water collecting port, and a lower leachate monitoring means communicating with each other end side of each of these lower leachate pipes is provided. An upper leachate pipe that communicates one end side with the upper water inlet of each layer is provided, and an upper leachate monitoring means that communicates with the other end side of each of these upper leachate pipes is provided. The entire area of the ground where the sheet members are laid is Ri branched and leachate leakage monitoring system of waste disposal sites which characterized in that a groundwater monitoring means in communication with the set have been other end of ground water pipe provided with a ground water tube opening.