JPH06106152A - Simple closed control type waste disposal plant and creation thereof - Google Patents

Abstract

PURPOSE:To provide a simple closed control type waste disposal plant caj4able of reducing the submersion treatment load to waste water treatment facilities due to a rainfall even if a creation area is wide, capable of rapidly specifying the damage place of a water barrier sheet and capable of utilizing a creation area at an early stage. CONSTITUTION:A landfill area formed by excavating the ground 1 is divided into a plurality of small landfill areas B, C, D adjacent each other in a horizontal direction and waste 5 is burried in the respective small landfill areas B, C, D (C, D; burrying scheduled areas). A water barrier sheet 4a is arranged to the wall surface of the landfill area and a covering soil layer 6 and a filter layer 13 respectively having at least water barrier sheets 4b, 4c are formed to the outside of the waste 5 and water leak monitoring drain pipes 14... are arranged in the soil 3a forming the wall surface 3 of the landfill area and the filter layer 13 formed to the boundary of the small landfill areas B, C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a managed waste disposal site suitable as a final disposal site for general waste.

[0002]

2. Description of the Related Art Generally, in a final disposal site of a management type waste which constitutes a water-blocking work with a surface water-blocking sheet, the ground is excavated on an inclined surface descending toward the inside, and the inclined surface and An impermeable sheet is placed on the bottom surface, and the leachate collection /
A drainage pipe is installed, waste is buried on the drainage pipe, an intermediate soil cover layer is provided in the middle of the waste landfill, and a low water permeable clay layer (surface cover soil) is formed on the upper layer of the drainage pipe. On the other hand, several wells for water quality monitoring have been set up around the disposal site, and the presence or absence of leached sewage from the disposal site to groundwater is checked by collecting water from this well.

[0003]

However, the above-mentioned waste disposal site has the following problems. That is,
Since the waste is buried on one side without dividing the place where the waste is buried, the treatment load of leachate to the wastewater treatment facility due to rainfall increases at the waste disposal site with a large construction area. In addition, since the water shield sheet is similarly arranged on one surface, the water shield sheet is easily damaged by ozone, ultraviolet rays, etc.,
It is difficult to identify the damaged part in the part where landfill is completed.
In addition, since the waste is buried without dividing the buried place, there is a problem that the waste site cannot be used unless the waste is buried in the entire buried place and the construction is completed.

The present invention has been made in view of the above-mentioned problems, and even in a waste disposal site having a large construction area, the load of inundation treatment on the wastewater treatment facility due to rainfall can be reduced, and the location of damage to the water shield sheet can be reduced. It is an object of the present invention to provide a simple closed type controlled waste disposal site that can be quickly identified and can be used early in a site that has already been created, and a method for creating it.

[0005]

In the simple closed type controlled waste disposal site according to claim 1 of the present invention, the landfill area formed by excavating the ground is divided into a plurality of horizontally adjacent small landfill areas. In addition, waste is buried in each small landfill area, a water impervious sheet is disposed on the wall surface of the landfill area, and a filter layer having at least an impervious sheet is formed outside the waste material. A drainage pipe for monitoring water leakage is installed in the soil forming the wall surface of the landfill area and in the filter layer formed at the boundary between the small landfill areas.

A method of constructing a simple closed type controlled waste disposal site according to a second aspect of the present invention is to excavate the ground to form a landfill area, and at the same time, in the soil forming the wall surface of the landfill area, a drainage pipe for water leakage monitoring. Along with burying, a water-blocking sheet is placed on this wall surface, and a small landfill area consisting of a fixed horizontal area is set in the landfill area from the edge of this landfill area, and at the bottom of the small landfill area. Waste is dumped, a filter layer having at least a water blocking sheet is formed on the outside of the waste layer, and a drainage pipe for leakage monitoring is installed at least in a portion located below the ground surface of the filter layer, and thereafter. Horizontally adjacent to the small landfill area in the horizontal direction, and in the other small landfill areas in the same order as the small landfill area, dumping of waste, formation of a filter layer having a water blocking sheet, and reduction of the number of the filter layers. It is characterized in that so as to form the installation of leak monitoring drainage pipe portion located below together ground surface.

[0007]

According to the simple closed type controlled waste disposal site of claim 1, water leakage is installed in the filter layer formed at the boundary between the soil forming the wall surface of the landfill area and the small landfill area. If the water-blocking sheet is damaged by the monitoring drain, leachate will be discharged. In addition, the safety of the impermeable sheet can be controlled by controlling the leachate in the drainage pipe for water leakage monitoring.

According to the method for constructing a simple closed type controlled waste disposal site according to the second aspect, the ground is excavated to form a landfill area, and water leakage is monitored in the soil forming the wall surface of the landfill area. While burying the drainage pipe, arranging a water blocking sheet on the wall surface of this landfill area, and setting a small landfill area consisting of a fixed horizontal area from the edge of this landfill area within the landfill area. Dumping waste at the bottom of the area,
A filter layer having at least a water blocking sheet is formed on the outside of the waste layer, and a drainage monitoring drainage pipe is installed in at least a portion below the ground surface of the filter layer, and then sequentially from the small landfill area. Horizontally adjacent to these other small landfill areas, in the same order as the said small landfill areas, dumping waste, forming a filter layer having a water-blocking sheet, and to at least a portion of the filter layer located below the ground surface. A drainage pipe for water leakage monitoring is installed and a managed waste disposal site is constructed.Whenever waste is dumped or a filter layer is formed in a small landfill area, leachate will be discharged independently for each small landfill area. Can be managed. In addition, by sequentially constructing each small landfill area, the entire landfill area is finally constructed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The simple closed type controlled waste disposal site and its construction method of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show an embodiment of a simple closed type management type waste disposal site of the present invention. In the figure, reference numeral A is a simple closed type management type waste disposal site, and 1 is a ground excavated for construction. A landfill area 2 is formed in the ground 1 by excavating the peripheral portion of the ground 1 on an inclined surface that descends toward the inside. The landfill area 2 has a cross-sectional view of the edge 2a of the landfill area 2.
Is divided into small landfill areas B, C, and D that are adjacent to each other in the horizontal direction (C and D in the figure are areas to be buried). In the landfill area 2, a filter layer 3a is formed along the excavation surface 2b. That is, the wall surface 3 of the landfill area 2 is formed of this filter layer 3a. A first water-impervious sheet 4a is arranged on the outer surface of the small landfill area B on the surface of the wall surface 3. The small landfill area B on the upper side of the first waterproof sheet 4a.
A waste 5 is buried inside.

On the upper surface of the outside of the waste 5, a soil cover layer 6 having a second water blocking sheet 4b is provided. In the soil cover layer 6, a low water permeable clay layer 7 is provided on the waste 5, a second water impervious sheet 4b is disposed on the surface of the clay layer 7, and the second water impervious sheet 4b. A drainage layer 8 having a drainage pipe 8a is provided on the drainage layer 8, and a filtration layer 9 is provided on the drainage layer 8.
Is provided, the vegetation soil 10 is provided on the filtration layer 9, and the covering soil 11 is provided on the vegetation soil 10. In this structure, the soil cover layer 6 is provided so as to block the infiltrating rainwater before the second water shield sheet 4b and drain the rainwater. On the other hand, a filter layer 13 having a third water-blocking sheet 4c is formed on the boundary 12 between the small landfill areas B and C outside the waste 5. The filter layer 13 has a structure in which a third water blocking sheet 4c is arranged outside the waste 5 and a filter layer 13a is formed inside the third water blocking sheet 4c. That is, in the above structure, the waste 5 is the first, second and third water-blocking sheets 4a, 4b and 4 disposed on the wall surface 3, the soil cover layer 6 and the filter layer 13, respectively.
It is surrounded and buried by c.

On the other hand, in the filter layer 3a forming the wall surface 3 of the landfill area 2 (in the soil) and in the filter layer 13 provided at the boundary 12 between the small landfill areas B and C, there is a perforated water leakage monitor. The drainage pipes 14 ... Are laid out in a substantially grid shape in a plan view. In this pipe, drainage pipe 14 for water leakage monitoring
Is configured to manage the leachate leached through the first water shield sheet 4a in the water leakage monitoring drain pipe 14.

Next, a method for constructing the simple closed type management type waste disposal site A of this embodiment will be described. Usually, large amounts of waste do not need to be disposed of at one time, but are collected in an amount that requires periodical disposal for a certain period of time. This simple closed type controlled waste disposal site A is a disposal site that meets the need for the above-mentioned disposal quantitatively for a certain period of time. The disposal site is divided into a plurality of small landfill areas, and these divided areas are divided. Waste will be sequentially dumped into the small landfill area.

First, the ground 1 at the planned site of the disposal site is excavated to form the landfill area 2, and the groundwater drain 1 for groundwater is used.
5 ... (one place in the figure) is piped in the ground 1. Next, in the landfill area 2, a small landfill area B consisting of a fixed area in the horizontal direction is set from the edge 2a of the landfill area 2. Then, the water leakage monitoring drainage pipes 14 are arranged in a substantially lattice pattern in a portion below the small landfill area B of the excavated surface 2b of the landfill area 2 in a plan view. In this case, it is advisable to use a water leak monitoring drain pipe 14 having a diameter of about 100 mm and a hole having a diameter of about 50 to 100 mm (determined from the geology of the ground 1, the amount of precipitation in the constructed land, etc.).

Next, these water leakage monitoring drain pipes 14 are buried with sand to form a sandy layer 3a, which is used as the wall surface 3 of the landfill section 2. Further, the first water impervious sheet 4a is arranged on the wall surface 3. Leachate drain pipes 16 ... (One place in the figure) for discharging the leachate that has leached into the waste 5 are arranged on the first water shield sheet 4a at the horizontal portion of the wall surface 3. Further, along the wall surface 3, gas vent pipes 17 ... (One place in the figure) for discharging the gas generated in the waste 5 are arranged.

Next, the waste 5 is dumped to the bottom of the small landfill area B to a predetermined height. Here, in burying the waste 5, considering the setting of the small landfill area C which is the next landfill area, the surface adjacent to the small landfill area C of the waste 5 layer is provided with a gentle slope. Further, a third water-impervious sheet 4c is provided on the surface of the waste 5 layer adjacent to the small landfill area C every time the waste 5 layer has a constant height.

The water leakage monitoring drain pipes 14 are arranged in a substantially lattice shape in a plan view below a portion of the excavation surface 2b below the small landfill area C and below the third water shield sheet 4c. Then, these water leakage monitoring drain pipes 14 are buried in sand to provide the filter layers 3a and 13a, which are the wall surface 3 and the filter layer 13, respectively. After burying the waste 5 to a predetermined height, the soil cover layer 6 is formed on the upper surface of the waste 5 layer, and the burial of the waste 5 in the small landfill area B is completed.
In this process step, water leakage monitoring drain pipes 14 are installed in the filter layer 3a forming the outer wall surface 3 of the waste 5 layer and in the filter layer 13.

In the following, in the same order as in the small landfill area B, dumping of waste, formation of a filter layer having a water-blocking sheet, and installation of a drainage pipe for water leakage monitoring at least in a portion located below the surface of the filter layer, Complete the construction of the disposal site.

When the waste 5 is buried in the small landfill area B for a long period of time, it is buried below the small landfill areas C and D which are the next planned landfill areas (only the small landfill area C is shown in the figure). ) Small dams 18 and 19 are provided in the small landfill areas C and D to drain rainwater so that the burden of leachate on the water leakage monitoring drain pipes 14 can be reduced.

FIG. 4 shows the management status of the leachate in the water leakage monitoring drain pipe 14. In the embodiment shown in this figure, a mobile water sampling device 20 is inserted along the water leakage monitoring drain pipe 14 to enable water sampling. Then, the water sampling device 20 collects the leachate in the leakage monitoring drain pipes 14 arranged in a grid pattern, and if the leachate is regularly investigated, for example, the water shield sheet 4a is damaged. Even if the breakage occurs at the position E, it is possible to judge the position by the change in the water quality.

As described above, according to the simple closed type management type waste disposal site A of this embodiment, the landfill area 2
Of the seepage water is checked by the drainage pipe 14 for water leakage monitoring buried in the filter soil layer 3a forming the wall surface 3 and the filter layer 13 formed in the small landfill areas B and C boundary 12, and damage to the impermeable works. Since it is possible to control the presence or absence of the waste, even if the landfill area is large, the burden can be reduced by making the leachate drainage pipe 16 independent. In addition, leachate can be managed independently for each small landfill area. Furthermore, since the waste is sequentially dumped into each small landfill section and a filter layer is formed to construct the landfill site, the landfill site can be used without waiting for the waste landfilling over the entire landfill area of the disposal site.

[0021]

According to the simple closed type management type waste disposal site and construction method of the present invention, the following effects can be obtained. According to the simple closed type controlled waste disposal site according to claim 1, the landfill area formed by excavating the ground is divided into a plurality of horizontally adjacent small landfill areas, and the landfill is disposed in each small landfill area. It has a structure in which objects are buried,
A water blocking sheet is disposed on the wall surface of the landfill area, a filter layer having a water blocking sheet is formed on the outside of the waste, and the soil forming the wall surface of the landfill area and the boundary between the small landfill areas are formed. Since the drainage pipe for leaking water was installed in the formed filter layer, the safety of the impermeable sheet can be confirmed, and even in a waste disposal site with a large construction area, it is possible to manage the leachate in the drainage water monitoring pipe. The damaged portion can be quickly identified and the correction can be dealt with. According to the method for constructing a simple closed type controlled waste disposal site according to claim 2, the ground is excavated to form a landfill area, and a drainage monitoring drainage pipe is buried in the soil forming the wall surface of the landfill area. In addition, a water blocking sheet is placed on the wall surface of the landfill area, and a small landfill area consisting of a fixed horizontal area is set in the landfill area from the edge of the landfill area, and at the bottom of the small landfill area. Waste is dumped, a filter layer having at least a water blocking sheet is formed on the outside of the waste layer, and a drainage pipe for leakage monitoring is installed at least in a portion located below the ground surface of the filter layer, and thereafter. Horizontally adjacent to the small landfill area in the horizontal direction, and in the other small landfill areas in the same order as the small landfill area, dumping of waste, formation of a filter layer having a water blocking sheet, and at least the surface of the filter layer Since the construction method was to install a drainage monitoring drainage pipe in the lower part, the leachate is independently discharged from each landfill area every time waste is dumped or a filter layer is formed. It becomes possible to manage the landfill site, and it is possible to use the reclaimed land without waiting for the waste to be buried over the entire landfill area of the disposal site.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a simple closed type management type waste disposal site of the present invention.

FIG. 2 is a plan view of a main part of the embodiment.

FIG. 3 is a longitudinal sectional view of an essential part showing details of a soil covering layer of the example.

FIG. 4 is a cross-sectional view of the main part of the same disposal site showing the collection status of leachate.

[Explanation of symbols]

 1 Ground 2 Landfill area 2a Edge 3 Wall surface 3a Soil 4a, 4b, 4c Impermeable sheet 5 Waste 6 Oversoil layer 13 Filter layer 14 ... Leakage monitoring drainage pipe A Simple closed type controlled waste disposal site B, C, D small landfill area

Claims (2)

[Claims] 1. A landfill area formed by excavating the ground is divided into a plurality of horizontally adjacent small landfill areas, and waste is buried in each small landfill area,
A water blocking sheet is disposed on the wall surface of the landfill area, and a filter layer having at least a water blocking sheet is formed on the outside of the waste, and the soil and the small landfill area forming the wall surface of the landfill area are formed. A simple closed-type managed waste disposal site, characterized by a drainage pipe for water leakage monitoring installed in the filter layer formed at the boundary between them. 2. A land reclamation area is formed by excavating the ground, a drainage pipe for water leakage monitoring is buried in the soil forming the wall surface of the land reclamation area, and a water impervious sheet is arranged on the wall surface. A small landfill area consisting of a certain area in the horizontal direction from the edge of this landfill area is set in the area, waste is dumped at the bottom of the small landfill area, and at least an impermeable sheet is placed outside the waste layer. A drainage pipe for water leakage monitoring is installed in at least a portion of the filter layer located below the ground surface, and then the small landfill area is sequentially adjacent to the other small landfill areas in the horizontal direction. In the same manner as the above-mentioned small landfill area, waste is dumped, a filter layer having a water-blocking sheet is formed, and a drainage pipe for leakage monitoring is installed at least in a portion located below the ground surface of the filter layer. This And a method of constructing a simple closed type management type waste disposal site characterized by.