JPH1043705A - Waste shielding method and waste shielding structure of waste disposal facility - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a waste shielding method and a waste shielding structure for a waste disposal facility that can ensure the safety of the facility even in the event of a breakage of the impermeable layer. . SOLUTION: Waste disposal site 1 for disposing of waste
1 is formed as a water-blocking layer 17, an internal water level observation well 12 for measuring the level of water staying inside the waste disposal site 11 is provided, and a pumping pipe for pumping the water. 13 and a pump 14 connected to the pumping pipe 13, and a groundwater level observation well 1 for measuring the groundwater level of the ground 15 around the waste disposal site 11.
6, the water level in the internal water level observation well 12 is set lower than the water level in the groundwater level observation well 16, and when the impermeable layer 17 is damaged, the groundwater flowing from the surrounding ground 15 is pumped up. The waste is shielded from the surrounding ground 15 by being pumped from the pumping pipe 13 by 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste shielding method and a waste shielding structure of a waste disposal facility for shielding the waste from the surrounding ground in the waste disposal facility.

[0002]

2. Description of the Related Art In a waste disposal facility such as a final waste disposal site or a contaminated soil treatment facility, a structure for shielding waste is installed in order to prevent contamination of surrounding soil by waste. An example of this type of structure is a waste shielding structure 2 provided at the bottom and sides of a waste disposal facility 1 as shown in FIG. The waste shielding structure 2 has a laminated structure including a water shielding sheet 3, a protective mat / drainage material 4, a ground shaping layer 5, and a protective soil layer 6, and a waste disposal facility is provided on the water shielding sheet 3. To prevent runoff due to overflow of contaminated water such as seepage water from the waste 7 accumulated in 1 and rainwater that has permeated the waste 7
A collecting pipe (not shown) is provided so that contaminated water can be detected and eliminated. In some cases, the protective mat under the water-blocking sheet 3, the drainage material 4 having a water collecting function, and the ground shaping layer 5 made of clay or mixed soil are not provided.

[0003]

As described above, in the conventional waste disposal facility, strict measures are taken to prevent the contamination of the surrounding soil by the waste. Soil and groundwater contamination has been reported around the disposal facility. These pollutions
It is probable that a part that shields waste, such as a water barrier sheet, was damaged due to some unexpected cause. However, conventionally, no facility has been constructed on the assumption that the shielding layer that shields the waste from the surrounding ground is damaged.

[0004] In addition, environmental pollution, which may be caused by the above reasons, frequently occurs around the waste disposal facility. In order to achieve this, it is essential to establish technologies that ensure the reliability of facilities.

In view of the above circumstances, in the waste shielding method and the waste shielding structure of the waste disposal facility according to the present invention, it is assumed that the water impervious layer is damaged, and in such a case, the safety of the facility is ensured. It is an object of the present invention to provide a waste shielding method and a waste shielding structure of a waste disposal facility that performs such a method.

[0006]

In the present invention, the following means are employed in order to solve the above-mentioned problems. That is, in the waste shielding method for a waste disposal facility according to claim 1, the method for shielding a waste from a surrounding ground in the waste disposal facility is a waste shielding method for a waste disposal facility. The bottom and walls of the waste disposal site for disposal are formed as impermeable layers, and an internal water level observation well is provided to enable measurement of the level of leachate staying inside the waste disposal site. A groundwater level observation well capable of measuring the groundwater level of the ground around the waste disposal site, and a water level at the internal water level observation well. Is set lower than the water level at the groundwater level observation well, and when the impermeable layer is damaged, the groundwater flowing from the surrounding ground is pumped by the pump. By pumping from the flop, characterized by shielding the waste from the surrounding ground.

According to a second aspect of the present invention, there is provided a waste shielding structure of a waste disposal facility for shielding waste from a surrounding ground in the waste disposal facility. A waste disposal site where the bottom and the wall are formed as impermeable layers and the waste is disposable;
An internal water level observation well capable of measuring the level of leachate retained inside the waste disposal site, a pumping pipe capable of pumping the leachate, a pumping pump connected to the pumping pipe, and the waste disposal And a groundwater level observation well for measuring the groundwater level of the ground around the facility.

[0008] In the waste shielding method and the waste shielding structure of the waste disposal facility, when the wall and bottom of the waste disposal site provided for disposing of the waste are formed as a water barrier layer. It is possible to cope with the breakage of the impermeable layer. Specifically, the water level inside the waste disposal site is kept lower than the groundwater level in the outer ground, and in the event of a break in the impermeable layer, groundwater is forced inside the waste disposal site due to the water pressure due to the difference in water level. Inflow and prevention of the spread of contamination by waste, and maintaining the water level difference by operating the pump, continue to prevent the spread of contamination until the damaged part is repaired.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a waste disposal facility 1 schematically showing an embodiment of the present invention. The waste disposal facility 1 includes a large shaft-shaped waste disposal site 11 formed by excavation in the ground, and a waste disposal site 11.
An internal water level observation well 12 for observing the internal water level, a pumping pipe 13 and a water pump 14 for pumping water staying therein from the waste disposal site 11, and disposed around the waste disposal site 11 And a groundwater level observation well 16 for observing the water level of the surrounding ground 15.
The wall and the bottom of the waste disposal facility 1 are formed as a water-blocking layer 17 using a rubber sheet. Further, in order to purify and discharge the water pumped by the water pumping pipe 13 and the water pump 14, A management / processing building 18 is provided. FIG. 2 is a view of the waste disposal facility 1 shown by a cross-sectional view in FIG. 1 when viewed from above.

Next, the operation of the present embodiment configured as described above will be described. In the waste disposal site 11,
When the waste 7 is accumulated as shown in FIG. 3, the water leached from the waste 7 or the rainwater flowing into the waste disposal site 11 becomes the leachate of the waste and forms the water surface 19. The disposal of the waste 7 is stopped at a certain point in time so that the water level 19 is lower than the groundwater level 20. When the amount of the waste 7 reaches a predetermined amount in this way, a water-blocking structure 21 that is integrated with the side surface and that prevents infiltration of infiltration water such as rainwater is installed at the upper part of the waste disposal site 11. Perform protection and treatment by covering the soil on the top. During this time, the water surface 1
The groundwater level observation well 16 and the internal water level observation well 12 are constantly monitored so that 9 is always lower than the groundwater level 20.

In this way, the waste 7 is accumulated in the waste disposal site 11, and if the impermeable layer 17 of the waste disposal site 11 is damaged due to an unexpected situation, the present embodiment is executed. The form will function as follows. First, when a breakage occurs in the impermeable layer 17, since the water surface 19 is maintained at a position lower than the groundwater level 20,
Due to the water level difference ΔH between the groundwater level and the groundwater level 20, water pressure is applied from the surrounding ground 15 toward the inside of the waste disposal site 11 at the damaged location. Therefore, groundwater permeates and flows into the waste disposal site 11 from the surrounding ground 15.

The water level difference ΔH tends to decrease due to the inflow of groundwater, but when the water level difference ΔH disappears, the inflow of groundwater stops, and the leachate of the waste 7 is diffused by the surrounding ground 15. May be contaminated. In order to prevent this, the operation of the water pump 14 is started to maintain the inflow of groundwater while maintaining the water level difference ΔH, thereby preventing the soil 7 and the groundwater in the surrounding ground 15 from being contaminated by the waste 7. The contaminated water pumped by the pump 14 is sent to the management and treatment building 18 where it is drained after being purified.

As described above, according to the present embodiment, when the waste 7 is accumulated in the waste disposal site 11, the water level difference ΔH is maintained between the groundwater level 20 of the surrounding ground and the water level 19 of the internally retained water. In addition, when the impermeable layer 17 is damaged, the contamination of the surrounding soil by the waste 7 is prevented. That is, by constantly observing the water level in the internal water level observation well 12 and the groundwater level observation well 16, it is confirmed whether or not there is a damaged portion in the impermeable layer 17. By operating the pump 14 and keeping the water level in the waste disposal site 11 lower than the outer groundwater level 20, the water contaminated by the waste 7 is prevented from flowing to the surrounding ground 15.

As described above, the present embodiment assumes a breakage of the impermeable layer that shields waste, and in this case, a new idea of preventing the spread of contamination by actively using the outer groundwater. This is completely different from the conventional technology that simply prevents the spread of contamination by strictly shielding the waste.

Further, in the present embodiment, while preventing outflow of sewage as described above, it is possible to specify a damaged portion and repair and repair the impermeable layer by an injection method or the like. The location of the damage site is determined by properly arranging the positions of the internal water level observation well 12 and the pumping pipe 13 inside the waste disposal site 11, and checking the operation status of the pump 14 and the water level change in the internal water level observation well 12. It may be performed by observation. As described above, according to the present embodiment, it has been difficult to specify the location of the leakage of contamination in the conventional waste disposal facility, but it has been easy to specify the location of the damage of the impermeable layer and to cope therewith Therefore, the safety and reliability of the waste treatment facility itself can be significantly improved.
In addition, in the conventional technology, contamination has already been confirmed by groundwater quality observation or the like after the contamination has already leaked to the surrounding ground, whereas in the present embodiment, the contamination of the surrounding ground by waste has been anticipated. And preventive measures such as repairing damaged parts. Further, it is preferable that the waste disposal facility 1 of the present embodiment is installed in a place where the groundwater level is relatively high, such as a landfill, and therefore, it is possible to secure a disposal place near an urban area.

The present invention is not limited to the above-described embodiment, but can be modified in materials used and in form. For example, in the above embodiment, a rubber sheet is used for the water-blocking layer 17, but it is also possible to use asphalt, shotcrete, cast concrete, or the like instead. It is also possible to use. Further, in the above embodiment, the planar shape of the waste disposal facility 1 is circular, but may be rectangular.

The purpose of use of the groundwater level observation well 16 need not be limited to the groundwater level observation alone, but may be used, for example, for monitoring the water quality of surrounding groundwater. Further, in the above embodiment, the water impermeable structure 21 is provided above the waste disposal site 11 after the disposal of the waste 7 is completed. A roof lining may be applied to the upper part of the material disposal site 11 so as to prepare for the entry of rainwater or the like. In this case, as a countermeasure against the gas generated from the waste, the installation of a gas-free pipe, a ventilation device, and the like may also be considered. Furthermore, it is also conceivable to systematize the water level measurement, the operation of the water pump, and the alarm system when the impermeable layer is broken in the above-described embodiment, and perform the automatic measurement and the automatic operation.

[0018]

According to the waste shielding method and the waste shielding structure of the waste disposal facility of the present invention, the level of the water staying inside the waste disposal site, whose bottom and walls are formed as impermeable layers, is measured. An internal water level observation well for measuring the internal water level, a pumping pipe and a pump for pumping this water are provided, while a groundwater level observation well for measuring the groundwater level of the surrounding ground is installed. The water level at is set lower than the water level at the groundwater level observation well, and the breakage of the impermeable layer is detected by monitoring the water level of these wells. In addition, if damage to the impermeable layer is confirmed, the groundwater flowing from the surrounding ground is pumped up by a pump to maintain the water level difference between the groundwater and the accumulated water inside the waste disposal site, thereby disposing of the groundwater. The inflow from the landfill can be maintained, and contamination of the surrounding ground due to the outflow of waste and leachate can be prevented. As described above, the present invention prevents the contamination of the surrounding ground by waste by actively utilizing the groundwater in the surrounding ground, and can easily and reliably perform management and monitoring. In particular, while the operation of the water pump prevents the surrounding ground from being contaminated by waste, it is possible to identify and repair damage to the impermeable layer, significantly improving the safety of the disposal facility compared to conventional technologies. And reliability is improved. In addition, the present invention is preferably installed in a relatively high groundwater level such as a landfill,
It is possible to secure a disposal site near the urban area.

[Brief description of the drawings]

FIG. 1 is a sectional view of a waste disposal facility showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating the waste disposal facility shown in FIG. 1 from above.

FIG. 3 is a cross-sectional view of a disposal facility for explaining the operation of the present embodiment shown in FIG.

FIG. 4 is a cross-sectional view of a waste disposal facility for explaining a conventional technique of the present invention.

[Explanation of symbols]

 1 Waste Disposal Facility 7 Waste 11 Waste Disposal Site 12 Internal Water Level Observation Well 13 Pumping Pipe 14 Pump Pump 15 Surrounding Ground 16 Groundwater Level Observation Well 17

Claims (2)

[Claims] 1. A waste disposal method for a waste disposal facility for shielding waste from a surrounding ground in the waste disposal facility, wherein a bottom and a wall of the waste disposal site for disposing of the waste are provided. Is formed as an impermeable layer, and an internal water level observation well is provided for enabling measurement of the level of leachate stagnating inside the waste disposal site, and is connected to a pumping pipe for allowing the leachate to be pumped and the pumping pipe. A groundwater level observation well capable of measuring the groundwater level of the ground around the waste disposal site is provided, and the water level at the internal water level observation well is set lower than the water level at the groundwater level observation well. In addition, when the impermeable layer is damaged,
By pumping the groundwater flowing from the surrounding ground from the pumping pipe by the pumping pump,
A method for shielding waste in a waste disposal facility, wherein the waste is shielded from surrounding ground. 2. A waste shielding structure of a waste disposal facility for shielding waste from surrounding ground in the waste disposal facility, wherein the bottom and the wall are formed as a water-impervious layer, and the waste is disposed of. A waste disposal site that has been made available, an internal water level observation well that can measure the level of leachate that is retained inside the waste disposal site, a pumping pipe that can pump up the leachate, and a pumping pipe. A waste shielding structure for a waste disposal facility, comprising: a connected pump; and a groundwater level observation well capable of measuring a groundwater level around the waste disposal facility.