JP2021171700A - Waste burying disposal field and design method of waste burying disposal field - Google Patents

Abstract

To provide a waste burying disposal field and a design method of a waste burying disposal field, capable of easily maintaining soundness of water leakage detection system even when an actual use period of a waste burying disposal field becomes prolonged period than its planned period.SOLUTION: A waste burying disposal field is a waste burying disposal field for landfill disposal of wastes, is assembled with water-shielding member provided in a landfill region and a detection system involving a plurality of water leakage detection units for detecting water leakage from the water-shielding member, wherein each of the plurality of water leakage detection units can be renewed separately.SELECTED DRAWING: Figure 2

Description

The present invention relates to a waste burial disposal site and a method for designing a waste burial disposal site.

Conventionally, a water-impervious member such as a water-impervious sheet is provided in a waste burial disposal site, and various water leakage detection systems for detecting water leakage from the water-impervious member are also known (see, for example, Patent Document 1). .. When designing a waste landfill site, the designer assumes a period when the waste landfill site is full and sets that period as the utilization planning period. In addition, the useful life (useful life) of the water leakage detection system is also set, and conventionally, this useful life is generally set according to the utilization plan period of the waste burial disposal site.

JP-A-2009-165905

However, in recent years, the volume reduction of waste has been promoted, and along with this, the actual usage period of the waste burial disposal site tends to be longer, and the actual usage period (actual utilization) of the waste burial disposal site tends to be longer. In some cases, the period) exceeds the initially set usage plan period. If the actual usage period of the waste landfill site is prolonged, it is expected that there will be an inconsistency between the useful life of the leak detection system and the usage period of the waste landfill site. If the waste is landfilled beyond the useful life of the leak detection system, the soundness of the leak detection system cannot be maintained, and the leak detection system needs to be updated.

However, updating the water leakage detection system costs a lot of money, and updating the water leakage detection system may increase the possibility of damaging the water shielding member and impair its soundness. ..

Therefore, the present invention makes it easy to ensure the soundness of the water leakage detection system even when the actual use period of the waste burial disposal site is extended beyond the use plan period set at the beginning of the plan. It is an object.

The waste landfill disposal site disclosed in the present specification is a waste landfill disposal site for landfill disposal of waste, and is provided with a water-impervious member provided in the landfill area and water leakage from the water-impervious member. A detection system having a plurality of leak detection units to be detected is provided, and each of the plurality of leak detection units can be individually updated.

In the above configuration, the landfill area may be divided into a plurality of areas, and the water leakage detection unit may be provided for each area.

Further, in the above configuration, the service life of at least one of the plurality of leak detection units may be different from the service life of the other leak detection units.

Further, in the above configuration, the useful life of each of the plurality of leak detection units may be set according to the order of dumping the wastes in the plurality of areas. The useful life of each of the plurality of leak detection units can be set to be shorter as the dumping order of the waste to the plurality of areas is slower.

In the above configuration, an information acquisition unit for acquiring the state of the water-impervious member may be further provided. The information acquisition unit can be an acceleration sensor.

The other waste landfill disposal site disclosed in the present specification is a waste landfill disposal site for landfill disposal of waste, from the water-impervious member provided in the landfill area and the water-impervious member. A plurality of leak detection units for detecting leaks are provided, and at least one useful life of the plurality of leak detection units is different from the useful life of the other leak detection units.

In the above configuration, the landfill area may be divided into a plurality of areas, and the water leakage detection unit may be provided for each area.

Further, in the above configuration, the useful life of each of the plurality of leak detection units may be set according to the order of dumping the wastes in the plurality of areas.

Further, in the above configuration, the useful life of each of the plurality of leak detection units may be set longer as the dumping order of the waste to the plurality of areas is slower.

The method for designing a landfill site disclosed in the present specification is a method for designing a landfill site for landfilling waste, and is a water-impervious area provided for each area where the landfill area is divided. It includes a step of determining the arrangement of a plurality of leak detection units for detecting water leakage from a member, and a step of determining the useful life of the plurality of leak detection units according to the dumping order of the waste.

In such a method, the leak detection unit is arranged at least on the bottom portion and the slope portion included in the landfill area, and the service life of the leak detection unit installed on the bottom portion and the leak detection installed on the slope portion. The useful life of the unit may be a different useful life.

According to the present invention, it is easy to ensure the soundness of the water leakage detection system even when the actual use period of the waste burial disposal site is extended beyond the use plan period set at the beginning of the plan. Can be done.

FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a waste burial disposal site according to the first embodiment. FIG. 2 is an explanatory diagram showing a water leakage detection system installed in the waste burial disposal site of the first embodiment. FIG. 3 (A) is an explanatory view schematically showing the installation state of the water leakage detection unit, and FIGS. 3 (B) and 3 (C) show water leakage detection by the water leakage detection unit when the water-impervious sheet is damaged. It is explanatory drawing which shows the mechanism schematically. FIG. 4 is a table showing the useful life set for each leak detection unit and the necessity of renewal in the first embodiment. FIG. 5 is a table showing the useful life set for each leak detection unit and the necessity of renewal in the second embodiment. FIG. 6 is an explanatory diagram showing a water leakage detection system installed in the waste burial disposal site of the third embodiment. FIG. 7 is an explanatory diagram showing the relationship between the magnitude of the risk of damage to the geomembrane sheet and the necessity of updating the leak detection unit in the third embodiment. FIG. 8 is a table showing the useful life set for each leak detection unit and the necessity of renewal in the fourth embodiment. FIG. 9 is a flowchart showing an example of the design method of the waste burial disposal site according to the fifth embodiment. FIG. 10 is an explanatory diagram showing the arrangement of the water leakage detection unit in the waste burial disposal site of the fifth embodiment.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
First, with reference to FIG. 1, a schematic configuration of a waste burial disposal site (hereinafter, simply referred to as “disposal site”) 100 will be described. FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a waste burial disposal site according to the first embodiment. A landfill area 101 is set in the disposal site 100. The landfill area 101 is divided into a plurality of areas. In the present embodiment, it is divided into three areas, a first disposal pit P1, a second disposal pit P2, and a third disposal pit P3. The burialable amounts of the waste 104 in the first disposal pit P1, the second disposal pit P2, and the third disposal pit P3 are almost the same. The disposal site 100 of the present embodiment is provided on an inclined surface, and the first disposal pit P1, the second disposal pit P2, and the third disposal pit P3 are provided in this order from the foot side to the top surface. The first disposal pit P1 to the third disposal pit P3 are subject to dumping of the waste 104 in this order. That is, the dumping order of the waste 104 at the disposal site 100 is the first disposal pit P1, the second disposal pit P2, and the third disposal pit P3. Capping 105 is applied to the full disposal pit.

Below the landfill area 101, a leachate adjusting facility 102 connected to each disposal pit is provided. The leachate adjusting facility 102 includes a storage tank that temporarily stores the precipitation that has passed through each disposal pit as leachate. The leachate adjustment facility 102 is connected to the leachate treatment facility 103, and the leachate stored in the leachate control facility 102 is treated at the leachate treatment facility 103 and discharged to the outside of the facility. Here, the leachate is wastewater that has exuded through the waste 104 in which precipitation such as rainwater has been dumped at the disposal site 100, and is sewage that needs to be treated to be discharged to the outside of the facility. ..

The form of the disposal site 100 shown in FIG. 1 is an example of the form of the disposal site, and the installation environment thereof, the method of dividing the landfill area, etc. are not limited to this, and differ depending on the disposal site construction plan. Sometimes. For example, the disposal site 100 does not require the leachate adjustment facility 102 and the leachate treatment facility 103, and the wastewater may be transported to an external water treatment facility, or the wastewater flow path may be sewage. It may be connected to the flow path.

A water-impervious sheet 10 as a water-impervious member is laid in the landfill area 101. The geomembrane sheet 10 prevents water leakage from the landfill area 101 of leachate passing through the landfill waste 104. The water-impervious sheet 10 is installed along the bottom and the slope of each disposal pit. The water-impervious sheet 10 may be installed in a state in which a plurality of sheets are stacked, such as being installed in a double layer, or may be installed together with asphalt, for example.

A water leakage detection system 20 is installed at the disposal site 100. The leak detection system 20 includes a monitor unit 21. The monitor side wiring 22 extends from the monitor unit 21. The monitor-side wiring 22 is branched into three, and a first monitor-side connector 22a, a second monitor-side connector 22b, and a third monitor-side connector 22c are provided at each end.

The leak detection system 20 includes three leak detection units, that is, a first leak detection unit 23a, a second leak detection unit 23b, and a third leak detection unit 23c. The first leak detection unit 23a, the second leak detection unit 23b, and the third leak detection unit 23c detect water leakage from the water-impervious sheet 10, for example, when the water-impervious sheet 10 is damaged. In the present embodiment, the first water leakage detection unit 23a detects the water leakage in the first disposal pit P1, and the second water leakage detection unit 23b detects the water leakage in the second disposal pit P2. Then, the third water leakage detection unit 23c detects the water leakage in the third disposal pit P3.

The first water leakage detection unit 23a includes a first unit side wiring 23a1 and a first unit side connector 23a2 provided at one end of the first unit side wiring 23a1. The first unit side connector 23a2 can be attached to and detached from the first monitor side connector 22a. A first electrode group 23a3 is provided at the other end of the first unit side wiring 23a1. The first electrode group 23a3 is provided according to the installation range of the water-impervious sheet 10 provided in the first disposal pit P1.

Similarly, the second water leakage detection unit 23b includes a second unit side wiring 23b1 and a second unit side connector 23b2 provided at one end of the second unit side wiring 23b1. The second unit side connector 23b2 can be attached to and detached from the second monitor side connector 22b. A second electrode group 23b3 is provided at the other end of the second unit side wiring 23b1. The second electrode group 23b3 is provided according to the installation range of the water-impervious sheet 10 provided in the second disposal pit P2.

Similarly, the third water leakage detection unit 23c includes a third unit side wiring 23c1 and a third unit side connector 23c2 provided at one end of the third unit side wiring 23c1. The third unit side connector 23c2 can be attached to and detached from the third monitor side connector 22c. A third electrode group 23c3 is provided at the other end of the third unit side wiring 23c1. The third electrode group 23c3 is provided according to the installation range of the water-impervious sheet 10 provided in the third disposal pit P3.

Here, the first electrode group 23a3, the second electrode group 23b3, and the third electrode group 23c3 will be described with reference to FIG. 2, which is an explanatory diagram showing the water leakage detection system 20 installed in the disposal site 100. Each electrode group shown in FIG. 2 is schematically shown, and the shape, the number of measurement electrodes, and the like are appropriately set according to the installation location.

The first electrode group 23a3 includes the first measurement electrode 23a31, the second measurement electrode 23a32, ... The nth measurement electrode 23a3n, which are provided so as to be distributed over the entire area including the slope portion from the bottom of the first disposal pit P1. It has. Similarly, the second electrode group 23b3 is provided so as to be distributed over the entire area including the slope portion from the bottom of the second disposal pit P2, the first measurement electrode 23b31, the second measurement electrode 23b32, ... The measurement electrode 23b3n is provided. Further, the third electrode group 23c3 is provided so as to be distributed over the entire area including the slope portion from the bottom of the third disposal pit P3, the first measurement electrode 23c31, the second measurement electrode 23c32, ... It includes electrodes 23c3n. The number of measurement electrodes can be set as appropriate.

Here, the outline of the leak detection mechanism by the leak detection unit will be described with reference to FIGS. 3 (A) to 3 (C). Although only a part of the first leak detection unit 23a arranged in the first disposal pit P1 is shown in FIGS. 3 (A) to 3 (C), the second leak detection unit 23b and the third leak detection are shown. The function and operation of the unit 23c are the same. Further, in FIGS. 3 (A) to 3 (C), the measurement electrode provided on the slope portion of the first disposal pit P1 is omitted.

A power feeding unit 24 is provided in the first disposal pit P1. The power feeding unit 24 includes a power supply 24a, an internal electrode 24b, and an external electrode 24c. The internal electrode 24b is provided so that its tip portion is immersed in the water 25 accumulated in the first disposal pit P1. The external electrode 24c is inserted into the ground 100a around the first disposal pit P1.

As shown in FIG. 3A, when the water-impervious sheet 10 is not damaged, the water-impervious sheet 10 which is an insulator cuts off the electric current between the internal electrode 24b and the external electrode 24c. No current flows.

On the other hand, for example, as shown in FIG. 3B, when a damaged portion 10a is found on the water-impervious sheet 10, the water 25 goes to the ground 100a on which the first disposal pit P1 is formed through the damaged portion 10a. Flow out. Along with this, as shown by arrow 26 in FIG. 3B, an electric current flows between the internal electrode 24b and the external electrode 24c through the water 25 flowing out from the damaged portion 10a and the ground 100a. Here, when the damaged portion 10a is in the vicinity of the third measurement electrode 23a33 included in the first electrode group 23a3, the monitor unit 21 shown in FIG. 2 indicates that the third measurement electrode 23a33 is energized. .. As a result, the damaged portion 10a of the water-impervious sheet 10 can be identified, and it is possible to grasp where the water leakage occurs.

Further, as shown in FIG. 3C, when the damaged portion 10a of the water-impervious sheet 10 is in the vicinity of the second measurement electrode 23a32, a current flows as shown by arrow 27 in FIG. 3C. , The monitor unit 21 shown in FIG. 2 indicates that the second measurement electrode 23a32 is energized. As a result, the damaged portion 10a of the water-impervious sheet 10 can be identified, and it is possible to grasp where the water leakage occurs.

Such a first leak detection unit 23a, a second leak detection unit 23b, and a third leak detection unit 23c can be updated individually. The first water leakage detection unit 23a can be separated from the water leakage detection system 20 by disconnecting the first unit side connector 23a2 from the first monitor side connector 22a, and can be updated separately from other parts. Similarly, the second leak detection unit 23b and the third leak detection unit 23c can be separated from the leak detection system 20 and updated separately from the other parts. In the leak detection system 20 of the present embodiment, the useful life is set for each leak detection unit. The useful life may be set in any unit, for example, monthly, but in the present embodiment, the useful life is set in years. That is, in the present embodiment, the useful life is set for each leak detection unit.

Here, with reference to FIG. 4, the utilization plan period of the disposal site 100, the useful life of each leak detection unit, and the necessity of updating the same will be described. FIG. 4 shows a case where it is determined whether or not renewal is necessary, assuming that the useful lives of the leak detection units provided in the first disposal pit P1 to the third disposal pit P3 are the same. The disposal site 100 of the present embodiment is designed so that the first disposal pit P1 to the third disposal pit P3 are full within 15 years after the start of use. That is, the planned utilization period of the disposal site 100 is 15 years.

The useful lives of the first leak detection unit 23a, the second leak detection unit 23b, and the third leak detection unit 23c are all the same as the usage planning period of the disposal site 100 with respect to the utilization planning period of the disposal site 100. It is set to 15 years.

Here, the assumed period from the start of use of the disposal site 100 to the fullness of each disposal pit will be referred to as the planned full period in each disposal pit. In the disposal site 100 of the present embodiment, the burialable amount of the waste 104 in the first disposal pit P1 to the third disposal pit P3 is roughly divided equally. Therefore, assuming that the landfill speed of the disposal site 100 is as originally planned, the planned full period of the first disposal pit P1 is 5 years. The planned full period of the second disposal pit P2 is 10 years, and the planned full period of the third disposal pit P3 is 15 years.

Therefore, if the landfill speed of the disposal site 100 is as planned, the useful life of the first water leakage detection unit 23a provided in the first disposal pit P1 exceeds the planned full period of the first disposal pit P1. Therefore, while the first disposal pit P1 is being reclaimed, the first water leakage detection unit 23a operates in a state where its useful life is guaranteed, and its soundness is maintained.

Similarly, if the landfill speed of the disposal site 100 is as planned, the useful life of the second water leakage detection unit 23b provided in the second disposal pit P2 exceeds the planned full period of the second disposal pit P2. Therefore, while the second disposal pit P2 is being reclaimed, the second water leakage detection unit 23b operates in a state where its useful life is guaranteed, and its soundness is maintained.

Further, the third water leakage detection unit 23c also operates in a state where its useful life is guaranteed while the third disposal pit P3 is being reclaimed, and its soundness is maintained.

At the disposal site 100, generally, if the landfill of the waste 104 progresses to some extent, the distance between the surface of the buried waste 104 and the water-impervious sheet 10 may increase, and the water-impervious sheet 10 may be damaged. Will be low. Therefore, the need for updating the leak detection system installed in the area where the landfill has been completed is reduced. Therefore, if the disposal site 100 is reclaimed according to the usage planning period, the disposal site 100 can be operated while maintaining the soundness of each water leakage detection unit.

However, it is assumed that the actual usage period (actual usage period) of the disposal site 100 exceeds the initially set usage planning period. For example, the volume of waste 104 may be reduced and the landfill speed may be slowed down. If the landfill speed is halved, the actual usage period when the disposal site 100 is full will be 30 years. In this case, the actual full period when the first disposal pit P1 is actually full is 10 years, which is twice the initial plan. Similarly, the actual full period of the second disposal pit P2 is 20 years, and the actual full period of the third disposal pit P3 is 30 years.

Here, the necessity of updating the leak detection unit in each disposal pit under such a situation will be examined. In the first disposal pit P1, the actual full period is 10 years, whereas the useful life of the first water leakage detection unit 23a is 15 years. Therefore, while the first disposal pit P1 is being reclaimed, the first water leakage detection unit 23a operates in a state where its useful life is guaranteed, and its soundness is maintained.

On the other hand, in the second disposal pit P2, the actual full period is 20 years, while the useful life of the second water leakage detection unit 23b is 15 years. That is, the useful life of the second water leakage detection unit 23b is less than the actual full period of the second disposal pit P2. Therefore, it is necessary to update the second water leakage detection unit 23b. The same applies to the third disposal pit P3 whose actual full period is 30 years, and it is necessary to update the third leak detection unit 23c.

In the present embodiment, when the leak detection unit needs to be updated in this way, the leak detection unit that needs to be updated can be separated from the leak detection system 20 and updated. In the example of the present embodiment, the second leak detection unit 23b and the third leak detection unit 23c may be separated from the leak detection system 20 and updated. According to the present embodiment, since the leak detection unit that needs to be updated may be updated, it is advantageous in terms of cost and the period required for the update as compared with the case of updating the entire leak detection system 20. The second leak detection unit 23b and the third leak detection unit 23c do not need to be updated at the same time, and the landfill start time in the second disposal pit P2 and the landfill start time in the third disposal pit P3 are taken into consideration. Each should be updated at an appropriate time.

As a method of updating, a new leak detection unit is installed after removing the old leak detection unit that has been installed until then. Such removal of the old water leakage detection unit may damage the water-impervious sheet 10. However, according to the present embodiment, the old water leakage detection unit may be removed at a necessary place, so that the water-impervious sheet 10 may be removed. The possibility of damage can be reduced. Further, as a method of updating, for example, if a new water leakage detection unit and a new water leakage detection unit are installed on the old water leakage detection unit, a new water leakage can be performed without worrying about damage to the water leakage detection sheet 10. A detection unit can be installed.

The updated second water leakage detection unit 23b can start water leakage detection by connecting the second unit side connector 23b2 to the second monitor side connector 22b. Further, the third water leakage detection unit 23c can start water leakage detection by connecting the third unit side connector 23c2 to the third monitor side connector 22c. This embodiment is also convenient in this respect.

As described above, the disposal site 100 of the present embodiment can easily secure the soundness of the water leakage detection system 20 even when the actual use period exceeds the use plan period set at the beginning of the plan. ..

The water leakage detection system 20 of the present embodiment detects water leakage using electrodes, but the method of water leakage detection is not limited to this, and even if another method is adopted. , It can be updated for each leak detection unit. Further, in the present embodiment, one water leakage detection unit is arranged for each disposal pit, but the method of dividing the landfill area 101 is not limited to this. For example, one disposal pit may be divided, a leak detection unit may be installed in each area, and each of these may be renewable.

(Second Embodiment)
Next, with reference to FIG. 5, the utilization planning period of the disposal site 100 of the second embodiment, the useful life of each leak detection unit, and the necessity of updating the same will be described. FIG. 5 shows a case where the service life of the second water leakage detection unit 23b and the third water leakage detection unit 23c is different from the service life of the first water leakage detection unit 23a. Specifically, the first The case where the useful life of the second leak detection unit 23b and the third leak detection unit 23c is shortened with respect to the useful life of the leak detection unit 23a is shown. The configuration of the disposal site 100 of the second embodiment is not different from that of the first embodiment. Therefore, in the following description of the second embodiment, each configuration requirement will be described using the same reference number as that of the first embodiment.

In the first embodiment, the service life of the second water leakage detection unit 23b and the service life of the third water leakage detection unit 23c were both 15 years. On the other hand, in the present embodiment, the useful life of the second leak detection unit 23b and the useful life of the third leak detection unit 23c are both set to 10 years.

The planned usage period of the disposal site 100 is set to 15 years, but on the other hand, it is expected that the actual usage period of the disposal site will be extended. In this case, as in the first embodiment in which the set useful life of all the leak detection units is set to 15 years, the actual full period becomes the useful life of the leak detection unit as the actual use period of the disposal site 100 becomes longer. May exceed. In the example of the first embodiment, the actual full period of the second leak detection unit 23b and the third leak detection unit 23c exceeds the useful life. As a result, it became necessary to update the second leak detection unit 23b and the third leak detection unit 23c.

In the present embodiment, the useful life of the leak detection unit whose actual full period is likely to exceed the useful life is shortened. In the present embodiment, the service life of the first water leakage detection unit 23a is 15 years, whereas the service life of the second water leakage detection unit 23b and the third water leakage detection unit 23c is set to 10 years.

In the present embodiment, the useful life is determined according to the dumping order of the waste 104 from the first disposal pit P1 to the third disposal pit P3. Specifically, the service life of the second leak detection unit 23b and the third leak detection unit 23c installed in the second disposal pit P2 and the third disposal pit P3, whose dumping order is slower than that of the first disposal pit P1, is set to be short. Has been done. The useful life of the third leak detection unit 23c installed in the third disposal pit P3 may be set shorter than the useful life of the second leak detection unit 23b.

As described above, by setting the useful life of the leak detection unit, which is expected to be updated, to be short, the installation cost of the entire leak detection system 20 can be suppressed. The useful life can be adjusted, for example, by changing the thickness of the measuring electrode. When shortening the service life, the diameter of each measurement electrode may be set small. By reducing the diameter of each measurement electrode, the cost of the water leakage detection system can be suppressed.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is an explanatory diagram showing a water leakage detection system 30 installed at the disposal site of the third embodiment. FIG. 7 is an explanatory diagram showing the relationship between the magnitude of the damage risk of the water-impervious sheet 10 and the necessity of updating the water leakage detection unit in the third embodiment.

Since the configuration of the disposal site of the present embodiment is substantially the same as that of the first embodiment, detailed description thereof will be omitted. Further, in the following description, the same components as the components in the first embodiment will be described using the same reference numbers even if they do not appear in FIG.

The disposal site of the present embodiment includes a water leakage detection system 30 instead of the water leakage detection system 20 provided in the disposal site 100 of the first embodiment. Like the leak detection system 20, the leak detection system 30 includes a first leak detection unit 23a, a second leak detection unit 23b, and a third leak detection unit 23c. However, the water leakage detection system 30 further includes a first acceleration sensor 31a, a second acceleration sensor 31b, and a third acceleration sensor 31c. The first acceleration sensor 31a, the second acceleration sensor 31b, and the third acceleration sensor 31c each function as an information acquisition unit for acquiring information regarding the state of the water-impervious sheet 10.

The first acceleration sensor 31a is installed in a substantially central portion of the first disposal pit P1 and is connected to the first unit side connector 23a2 via wiring. The second acceleration sensor 31b is arranged substantially in the center of the second disposal pit P2, and is connected to the second unit side connector 23b2 via wiring. The third acceleration sensor 31c is installed in the substantially central portion of the third disposal pit P3, and is connected to the third unit side connector 23c2 via wiring.

In each disposal pit, the heavy machinery carried in runs, and the ground and the surface of the dumped waste 104 are leveled by the heavy machinery. Such work in each disposal pit may affect the durability of the leak detection unit provided in each disposal pit. Further, when the waste 104 is dumped in the disposal pit, it is considered that the dumping work and the weight of the waste 104 itself affect the durability of the water leakage detection unit.

Therefore, in the present embodiment, the risk of damage to the water-impervious sheet 10 is evaluated based on the information obtained by the acceleration sensor, and based on the evaluation, it is necessary to replace the water-impervious sheet 10 or update the water leakage detection unit. To judge.

The effects of vibrations in the disposal pit on the leak detection unit are not uniform. The effect also differs depending on the disposal pit. Therefore, in the present embodiment, information such as vibration in the first disposal pit P1 is acquired by the first acceleration sensor 31a, and the risk of damage to the water-impervious sheet 10 installed in the first disposal pit P1 is calculated from the acquired information. .. In addition, information such as vibration in the second disposal pit P2 is acquired by the second acceleration sensor 31b, and the risk of damage to the water-impervious sheet 10 installed in the second disposal pit P2 is calculated from the acquired information. Similarly, information such as vibration in the third disposal pit P3 is acquired by the third acceleration sensor 31c, and the risk of damage to the water-impervious sheet 10 installed in the third disposal pit P3 is calculated from the acquired information. In the present embodiment, the damage risk can be calculated as an integrated value of "acceleration (magnitude of vibration) x time". However, the present invention is not limited to this, and the risk of damage may be calculated by another method using acceleration (magnitude of vibration).

The damage risk can be used to determine the necessity of updating the leak detection unit. With reference to FIG. 7, when the risk of damage to the geomembrane sheet 10 is high, the need for updating the target water leakage detection unit is high, and when the risk of damage is low, the target water leakage detection unit The need for updates is low. For example, a threshold value for the necessity of updating the water leakage detection unit is set in advance in the value for evaluating the damage risk, and when the damage risk exceeds the threshold value, it is determined that the water leakage detection unit needs to be updated. be able to.

Here, since the necessity of updating can be performed for each leak detection unit, the leak detection unit determined to need to be updated may be updated. In the present embodiment, similarly to the first embodiment, the first leak detection unit 23a, the second leak detection unit 23b, and the third leak detection unit 23c can be individually updated. This makes it easier to ensure the soundness of the water leakage detection system 30. For example, even if the set service life has not been reached, the soundness of the water leakage detection system 30 can be achieved by updating the water leakage detection unit that detects the water leakage of the water-impervious sheet 10 that has a high risk of damage. You can keep your sex.

In the present embodiment, one acceleration sensor is installed in one disposal pit, but a plurality of acceleration sensors may be installed in one disposal pit. Further, in the present embodiment, each acceleration sensor is connected to the unit side connector so that both the water leakage detection unit can be updated. However, the acceleration sensor may be excluded from the update target, or water leakage may occur. It may be possible to update it separately from the detection unit.

(Fourth Embodiment)
Next, with reference to FIG. 8, the utilization plan period of the disposal site 100 of the fourth embodiment, the useful life of each leak detection unit, and the necessity of updating the same will be described. FIG. 8 shows a case where the service life of the second water leakage detection unit 23b and the third water leakage detection unit 23c is different from the service life of the first water leakage detection unit 23a. Specifically, the first The case where the useful life of the second leak detection unit 23b and the third leak detection unit 23c is extended with respect to the useful life of the leak detection unit 23a is shown. The configuration of the disposal site 100 of the fourth embodiment is not different from that of the first embodiment. Therefore, in the following description of the fourth embodiment, each configuration requirement will be described using the same reference number as that of the first embodiment.

In the first embodiment, the service life of the first leak detection unit 23a to the third leak detection unit 23c was 15 years. On the other hand, the service life of the first water leakage detection unit 23a in the present embodiment is 10 years, the service life of the second water leakage detection unit 23b is 20 years, and the service life of the third water leakage detection unit 23c is 30 years. .. This sets the useful life according to the actual full period of each disposal pit.

For each leak detection unit of the disposal site 100, two periods are assumed: a planned full period based on the initial usage plan period and an actual full period set in anticipation of slowing the landfill speed. Therefore, in the present embodiment, the useful life of each leak detection unit is set according to the longer of the two periods.

As a result, the soundness of the leak detection system 20 can be maintained until the use of the disposal site 100 is completed without updating each leak detection unit.

The service life can be set and changed by changing the thickness of the measuring electrode, for example, as in the second embodiment. Further, the fourth embodiment may be a combination with the third embodiment. That is, the service life of the water leakage detection unit is set according to the policy described in the fourth embodiment, and the water shielding sheet 10 is replaced or the water leakage detection unit is updated based on the information obtained by the acceleration sensor installed at a predetermined location. May be determined.

(Fifth Embodiment)
Next, as a fifth embodiment, an example of the design method of the disposal site 200 will be described with reference to FIGS. 9 and 10. FIG. 9 is a flowchart showing an example of the design method of the disposal site 200 of the fifth embodiment. FIG. 10 is an explanatory diagram showing the arrangement of the water leakage detection unit in the disposal site 100 of the fifth embodiment. The disposal site 200 includes the first disposal pit P1 to the third disposal pit P3 like the disposal site 100 in the first embodiment, but FIG. 10 shows only the first disposal pit P1.

The disposal site 200 of the fifth embodiment includes a water leakage detection system 40 instead of the water leakage detection system 20 provided in the disposal site 100 of the first embodiment. In the following description, the configuration requirements common to the configuration requirements in the first embodiment will be described using the same reference numbers.

When designing the disposal site 200, first, as step S1, it is determined at which position the plurality of leak detection units are to be installed. In the present embodiment, in each disposal pit of the first disposal pit P1 to the third disposal pit P3, a water leakage detection unit is installed so as to distinguish the bottom portion and the slope portion.

Here, referring to FIG. 10 showing the first disposal pit P1, the first disposal pit P1 includes a bottom portion P1b, and slope portions P1s on the foot side and the top surface thereof. A foot leak detection unit 23aa is arranged on the slope portion P1s on the foot side, and a bottom water leakage detection unit 23ab is arranged on the bottom P1b. A top leak detection unit 23ac is arranged on the top slope P1s.

Similarly, in the second disposal pit P2 and the third disposal pit P3, the slope leakage detection unit and the bottom leakage detection unit are arranged.

The foot-side water leakage detection unit 23aa can be attached to and detached from the monitor unit 21 via the foot-side connector 23aa2. The bottom water leakage detection unit 23ab can be attached to and detached from the monitor unit 21 via the bottom connector 23ab2. Similarly, the top water leakage detection unit 23ac can be attached to and detached from the monitor unit 21 via the top connector 23ac2.

After the arrangement of the leak detection units is determined, next, as step S2, the useful life of each leak detection unit is determined. In the present embodiment, the useful life of each leak detection unit is determined based on the useful life of each leak detection unit in the fourth embodiment.

In the fourth embodiment, as shown in FIG. 8, the service life of the first leak detection unit 23a installed in the first disposal pit P1 is 10 years, and the service life of the second leak detection unit 23b installed in the second disposal pit P2 is 10 years. The useful life of the third water leakage detection unit 23c installed in the third disposal pit P3 is 20 years, and the useful life of the third water leakage detection unit 23c is 30 years.

In the present embodiment, the service life of the foot leak detection unit 23aa and the top leak detection unit 23ac installed on the slope P1s of the first disposal pit P1 is the same as the service life of the first leak detection unit 23a in FIG. It is set to 10 years). Then, the service life of the bottom water leakage detection unit 23ab installed on the bottom P1b is set to 5 years, which is shorter than the service life of the first water leakage detection unit 23a in FIG.

Here, the reason why the difference is provided between the service life of the foot leak detection unit 23aa and the top leak detection unit 23ac installed on the slope P1s and the service life of the bottom leak detection unit 23ab installed on the bottom P1b will be described. do.

At the bottom of each disposal pit, it can be considered that as the landfill of the waste 104 progresses, the possibility of accidentally damaging the water leakage detection unit due to the operation of heavy machinery or the like is reduced. Therefore, it is considered that the useful life should be guaranteed for a while after the reclamation of the target disposal pit is started. On the other hand, on the slope, the leak detection unit continues to exist near the surface layer of the slope, and the possibility that the leak detection unit will be damaged by work with heavy machinery or other work is higher than at the bottom. It is considered expensive. Therefore, for the leak detection unit installed on the slope, the useful life that can satisfy the actual full period of the target disposal pit is set. On the other hand, the leak detection unit installed at the bottom has a service life shorter than the service life of the leak detection unit installed on the slope.

In the second disposal pit P2 and the third disposal pit P3, the useful life of the leak detection unit is determined in the same manner. That is, in the second disposal pit P2, the useful life of the leak detection unit installed at the bottom is determined to be 15 years, and the useful life of the leak detection unit installed at the slope is determined to be 20 years. In the third disposal pit P3, the useful life of the leak detection unit installed at the bottom is determined to be 25 years, and the useful life of the leak detection unit installed at the slope is set to 30 years. The useful life of each part shown in FIG. 9 is an example, and may be set to another useful life. Further, in the present embodiment, the useful lives of the bottom and the slope portion are set based on the useful lives of the disposal pits of the fourth embodiment shown in FIG. 8, for example, the first embodiment and the second embodiment. The useful life of the bottom and the slope may be set based on the useful life of each disposal pit.

In this way, the cost of the leak detection system can be suppressed by determining the useful life of the leak detection unit according to the characteristics of the place where the leak detection unit is installed.

Although not shown in the drawing, the water leakage detection unit may be arranged on the slope portion located on the side of each disposal pit. In this case, the useful life of the leak detection unit can be matched with the useful life of the leak detection unit installed on another slope.

The effects of adopting the disposal site and the disposal site design method disclosed in this specification are summarized below.

According to the disposal site disclosed in the present specification, each of the plurality of leak detection units can be individually updated. Therefore, the leak detection unit can be individually updated according to the environment in which the leak detection unit is installed and the usage state of the leak detection unit, and the soundness of the leak detection system can be ensured.

Since the water leakage detection unit can be provided for each area where the landfill area is divided, it is possible to determine whether or not to update the water leakage detection unit in consideration of the state and characteristics of the area, and it is possible to detect water leakage. The soundness of the system can be ensured.

Further, by making the service life of at least one of the plurality of leak detection units different from the service life of the other leak detection units, it is possible to suppress the cost while ensuring the soundness of the leak detection system.

Further, by setting the useful life of each of the plurality of leak detection units according to the order of dumping the waste in the plurality of areas, the useful life can be set in consideration of the timing of dumping the waste in the plurality of areas. For example, the useful life of each of the multiple leak detection units is set shorter as the waste dumping order for multiple areas is slower, so that the useful life of the leak detection unit, which is likely to be renewed, is set shorter and the cost is reduced. It can be suppressed.

By further providing an information acquisition unit (accelerometer) that acquires the state of the water-impervious member (water-impervious sheet), it is determined whether or not the water leakage detection unit that detects water leakage from the water-impervious member with a high risk of damage needs to be updated. be able to. As a result, the soundness of the leak detection system can be ensured.

According to other disposal sites disclosed herein, the useful life of at least one of the plurality of leak detection units may be different from the useful life of the other leak detection units. For example, the useful life of each of the plurality of leak detection units can be set longer as the waste dumping order for the plurality of areas is slower. As a result, waste can be buried while ensuring the soundness of the leak detection system even in areas where the dumping order is slow.

Further, according to the disposal site design method disclosed in the present specification, the arrangement of a plurality of water leakage detection units for detecting water leakage from the impermeable member provided for each area where the landfill area is divided is determined, and the arrangement is determined. The useful life can be set accordingly. For example, the leak detection unit is arranged at least on the bottom and the slope included in the landfill area, and the useful life of the leak detection unit installed on the bottom and the useful life of the leak detection unit installed on the slope are different. Can be. This makes it possible to determine whether or not to update the leak detection unit in consideration of the state and characteristics of the area.

The embodiments described above are examples of preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

10 Geomembrane sheet 20, 30, 40 Leakage detection system 23a 1st leak detection unit 23b 2nd leak detection unit 23c 3rd leak detection unit 23aa Foot leak detection unit 23ab Bottom leak detection unit 23ac Top top leak detection unit 24 Power supply unit 31a 1st accelerometer 31b 2nd accelerometer 31c 3rd accelerometer 100 Waste landfill site 101 Landfill area P1 1st disposal pit P2 2nd disposal pit P3 3rd disposal pit

Claims (13)

It is a waste landfill site for landfill disposal of waste.
The impermeable member provided in the landfill area and
A detection system having a plurality of water leakage detection units for detecting water leakage from the water shielding member is provided.
A waste burial disposal site where each of the plurality of leak detection units can be individually updated. The waste landfill disposal site according to claim 1, wherein the landfill area is divided into a plurality of areas, and the water leakage detection unit is provided for each area. The waste burial disposal site according to claim 1 or 2, wherein the service life of at least one of the plurality of leak detection units is different from the service life of the other leak detection units. The waste burial disposal site according to claim 2, wherein the service life of each of the plurality of leak detection units is set according to the order of dumping the wastes in the plurality of areas. The waste burial disposal site according to claim 4, wherein the service life of each of the plurality of leak detection units is set shorter as the dumping order of the waste to the plurality of areas is slower. The waste burial disposal site according to claim 1, further comprising an information acquisition unit for acquiring the state of the impermeable member. The waste burial disposal site according to claim 6, wherein the information acquisition unit is an acceleration sensor. It is a waste landfill site for landfill disposal of waste.
The impermeable member provided in the landfill area and
A plurality of water leakage detection units for detecting water leakage from the water shielding member are provided.
A waste burial disposal site where at least one of the plurality of leak detection units has a different useful life from the other leak detection units. The waste landfill disposal site according to claim 8, wherein the landfill area is divided into a plurality of areas, and the water leakage detection unit is provided for each area. The waste burial disposal site according to claim 9, wherein the service life of each of the plurality of leak detection units is set according to the order in which the waste is dumped into the plurality of areas. The waste burial disposal site according to claim 10, wherein the service life of each of the plurality of leak detection units is set longer as the dumping order of the waste to the plurality of areas is slower. It is a method of designing a waste landfill site for landfill disposal of waste.
A process of determining the arrangement of a plurality of water leakage detection units for detecting water leakage from a water-impervious member provided for each area in which the landfill area is divided, and a process of determining the arrangement of a plurality of water leakage detection units.
A method for designing a waste burial disposal site, which includes a step of determining the useful life of the plurality of leak detection units according to the order of dumping the waste. The leak detection unit is arranged at least on the bottom portion and the slope portion included in the landfill area, and the service life of the water leak detection unit installed on the bottom portion and the service life of the water leak detection unit installed on the slope portion. The method for designing a waste landfill site according to claim 12, wherein the life is different.

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