surveillance device

Abstract

To provide long-term power to a monitoring device.SOLUTION: A monitoring device 10 includes a sensor 1 that detects information relating to a landfill site 9 filled with a landfill material 90 containing incineration residues, and a battery 2 that generates power supplied to the sensor 1. The battery 2 includes a positive electrode 21 and a negative electrode 22 that are immersed in water retained in the landfill material 90 or seepage water from the landfill material 90.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed herein relates to a monitoring device. [Background technology]

[0002] Landfill monitoring devices have been known for some time. For example, Patent Document 1 discloses a device that is installed underground in a landfill and detects harmful substances underground. This device detects harmful substances and outputs detection data of the harmful substances to an external device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-53356 Summary of the Invention [Problem to be solved by the invention]

[0004] The monitoring device can be installed anywhere on the landfill. If the monitoring device is powered by a commercial power source or a large power supply, it is necessary to extend wiring from a connector such as an outlet or the power supply to the monitoring device, which makes installation of the monitoring device complicated. In other words, the installation location of the monitoring device is restricted by the connector or the power supply.

[0005] To address this issue, it is conceivable to power the monitoring device with a battery. However, in order to monitor a landfill, it is preferable that the monitoring device operate for a long period of time. Therefore, the battery is required to supply power to the monitoring device for a long period of time.

[0006] The technology disclosed herein has been made in view of the above points, and its purpose is to supply power to a monitoring device over a long period of time. [Means for solving the problem]

[0007] The landfill monitoring device disclosed herein comprises a sensor that detects information related to a landfill filled with landfill material containing incineration residues, and a battery that generates power to be supplied to the sensor, the battery having a positive electrode and a negative electrode that are immersed in the water retained in the landfill material or in leachate from the landfill material. [Effects of the Invention]

[0008] According to the monitoring device, it is possible to supply power to the monitoring device for a long period of time. [Brief explanation of the drawings]

[0009] [Figure 1] Figure 1 is a schematic diagram of a landfill monitoring system. [Figure 2] Figure 2 is a schematic diagram showing the structure of the landfill. [Figure 3] FIG. 3 is a functional block diagram of the monitoring device. [Figure 4] FIG. 4 is a perspective view of the battery. [Figure 5] FIG. 5 is a perspective view of the battery with the case removed. [Figure 6] FIG. 6 is a perspective view of the case. DETAILED DESCRIPTION OF THE INVENTION

[0010] Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

[0011] Fig. 1 is a schematic diagram of a monitoring system 100 for a landfill 9. Fig. 2 is a schematic diagram showing the configuration of the landfill 9.

[0012] As shown in Figure 2, the landfill 9 is made of landfill material 90 containing incineration residue. The incineration residue contains at least incineration ash. The landfill 9 is made by piling up the landfill material 90 in a depression 91 in the ground G. The depression 91 is defined by a bottom 91a and slopes 91b on both sides of the bottom 91. For example, the depression 91 is formed between mountains or valleys. The landfill 9 is not limited to land formed by filling in lakes or the sea, but also includes land formed by filling in land.

[0013] A waterproof sheet 92 is laid on the surface of the depression 91. A protective layer 93 is provided on the waterproof sheet 92. The protective layer 93 is formed of at least one of a protective mat, protective sand, and protective soil. For example, the protective layer 93 at the bottom 91a may be protective sand or protective soil, and the protective layer 93 at the slope 91b may be a protective mat.

[0014] A collection and drainage pipe 94 is laid on the protective layer 93. The collection and drainage pipe 94 collects and discharges leachate. The collection and drainage pipe 94 has a trunk pipe 94a, branch pipes 94b, and a vertical pipe 94c. The trunk pipe 94a is disposed above the bottom 91a. The trunk pipe 94a extends along the bottom 91a at a gentle slope. A plurality of branch pipes 94b are connected to the trunk pipe 94a. The branch pipes 94b extend from the bottom 91a along the slope 91b. A plurality of vertical pipes 94c are connected to the trunk pipe 94a. The vertical pipes 94c extend upward from the trunk pipe 94a. The collection and drainage pipe 94 is formed in a leaf vein shape as a whole.

[0015] Stones such as pebbles (not shown) may be piled around the trunk pipe 94a, the branch pipe 94b, and the vertical pipe 94c. That is, the trunk pipe 94a, the branch pipe 94b, and the vertical pipe 94c may each be covered with stones.

[0016] The trunk pipe 94a, branch pipe 94b, and vertical pipe 94c are each formed as a perforated pipe with multiple holes penetrating the pipe wall in the thickness direction. Rainwater and other water that permeates the landfill material 90 enters the trunk pipe 94a, branch pipe 94b, and vertical pipe 94c through the holes in each of these pipes. The trunk pipe 94a discharges leachate to the outside. The branch pipe 94b collects leachate mainly on the slope 91b and directs the collected leachate back into the trunk pipe 94a. In addition to collecting leachate from the landfill material 90, the vertical pipe 94c discharges gas generated in the landfill material 90 or the trunk pipe 94a into the air. The vertical pipe 94c also functions as a gas vent pipe.

[0017] As shown in Figure 1, the leachate collected by the collection and discharge pipe 94 is finally discharged to a leachate adjustment pond 95 via a main pipe 94a. The leachate adjustment pond 95 temporarily stores the leachate. The leachate stored in the leachate adjustment pond 95 is sent to a leachate treatment facility 96, where it is purified. The leachate adjustment pond 95 is an example of a storage section.

[0018] The monitoring system 100 includes a plurality of monitoring devices 10 and a management device 7. The monitoring devices 10 detect information related to a landfill 9. The monitoring devices 10 are installed at locations corresponding to the information related to the landfill 9. The monitoring devices 10 transmit the detected information (hereinafter referred to as "detected information") to the management device 7. The management device 7 collects and stores the detected information from the monitoring devices 10.

[0019] The management device 7 is, for example, a server. The management device 7 may be a so-called cloud server that realizes cloud computing. The management device 7 stores the detection information transmitted from the monitoring device 10 via wireless communication. The management device 7 transmits the stored detection information to the terminal 72 as appropriate.

[0020] FIG. 3 is a functional block diagram of the monitoring device 10. The monitoring device 10 includes a sensor 1 that detects information related to the landfill 9 and a battery 2 that generates power to be supplied to the sensor 1. For example, the information related to the landfill 9 is physical, chemical, or biological information about the landfill 9. Specifically, the information related to the landfill 9 may be the quality of the retained water in the landfill material 90 or the leachate from the landfill material 90, the quality of the gas discharged from the standpipe 94c, or the physical condition of the waterproof sheet 92. More specifically, the information related to the landfill 9 may be the temperature, pH, or concentration of pollutants in the retained water or the leachate, the temperature, humidity, or concentration of a predetermined component in the gas, the pressure acting on the waterproof sheet 92, or the distortion or tensile stress of the waterproof sheet 92.

[0021] Sensor 1 is installed in a location depending on the information to be detected. When detecting the water quality of retained water, sensor 1 may be installed in landfill material 90. When detecting the water quality of leachate, sensor 1 may be installed in collection drainage pipe 94 or leachate adjustment pond 95. When detecting the quality of gas, sensor 1 may be installed in standpipe 94c. When detecting the physical state of waterproof sheet 92, sensor 1 may be installed in contact with waterproof sheet 92.

[0022] The monitoring device 10 may further include a control unit 4. For example, the control unit 4 has a processor and a memory. The control unit 4 controls the entire monitoring device 10. Specifically, the control unit 4 causes the sensor 1 to detect information related to the landfill site 9 at a predetermined period.

[0023] The monitoring device 10 may further include a communication module 5 that communicates with external devices. The communication module 5 is controlled by the control unit 4. Specifically, the control unit 4 transmits the detection information of the sensor 1 to the management device 7 via the communication module 5. The control unit 4 transmits the detection information of the sensor 1 at a predetermined communication cycle. The communication cycle is controlled by the control unit 4. For example, the communication module 5 may be a wireless communication module that performs LF (Low Frequency) communication, Wi-Fi communication, Bluetooth (registered trademark) communication, Zigbee (registered trademark) communication, or LoRa (registered trademark) communication. These wireless communication standards are selected taking into consideration the amount of communication data from the connected sensor, attenuation of communication radio waves, and the like. For example, LF communication has little attenuation even underground or underwater, and is therefore suitable for communication inside the landfill material 90. High-frequency communication such as Wi-Fi communication and Bluetooth (registered trademark) communication is suitable for communication using the collection and drainage pipe 94 as a waveguide. The communication module 5 communicates with the management device 7 via a gateway 71 such as a Wi-Fi router. The communication module 5 may also communicate with the management device 7 via a mobile phone or a PC.

[0024] The monitoring device 10 may further include a capacitor 6. The capacitor 6 stores power from the battery 2. The sensor 1 is powered via the capacitor 6. The control unit 4 and the communication module 5 are also powered via the capacitor 6.

[0025] The monitoring device 10 has a main body 11 including at least a control unit 4, and the sensor 1 and the battery 2 may each be physically separated from the main body 11. The sensor 1 and the battery 2 are each electrically connected to the main body 11 via wiring. In this case, the sensor 1 and the battery 2 can each be placed in a position relative to the main body 11 as far as the wiring allows.

[0026] Next, a detailed description will be given of the battery 2. Fig. 4 is a perspective view of the battery 2. Fig. 5 is a perspective view of the battery 2 with the case 3 removed. Fig. 6 is a perspective view of the case 3.

[0027] 5, the battery 2 has a positive electrode 21 and a negative electrode 22. The positive electrode 21 and the negative electrode 22 are immersed in retained water or leachate.

[0028] More specifically, in this example, the battery 2 has two pairs of positive electrodes 21 and negative electrodes 22. In the battery 2, one pair of positive electrodes 21 and the other pair of negative electrodes 22 overlap with each other, and the two pairs of positive electrodes 21 and negative electrodes 22 are connected in series. The positive electrodes 21 and negative electrodes 22 are formed of metals with different ionization tendencies. The ionization tendency of the positive electrode 21 is smaller than the ionization tendency of the negative electrode 22. For example, the positive electrode 21 is Cu, and the negative electrode 22 is Al, Zn, or Mg. However, the combination of the positive electrode 21 and the negative electrode 22 is not limited to these.

[0029] The battery 2 further includes a water retention member 23 that stores retained water or leachate. The water retention member 23 retains water. For example, the water retention member 23 may be a porous medium. Specifically, the water retention member 23 is formed of a porous material. The water retention member 23 may be formed of ceramic, lime, or sponge. The water retention member 23 is disposed between the positive electrode 21 and the negative electrode 22. The battery 2 includes two sets of positive electrodes 21 and negative electrodes 22, and therefore includes two water retention members 23. The water retention member 23 is an example of a water retainer.

[0030] In addition, the battery 2 further includes a case 3 for storing retained water or leachate. The case 3 houses the positive electrode 21 and the negative electrode 22 and retains water. The case 3 is an example of a water retainer. In this example, the case 3 houses two sets of positive electrodes 21, negative electrodes 22, and water retention members 23. As shown in FIG. 6, the case 3 has a substantially rectangular box shape. The case 3 has a ceiling 31 and a bottom 32 facing each other, and four side walls 33 connecting the ceiling 31 and the bottom 32. The ceiling 31 has an inlet 34 formed in a slit shape. The bottom 32 has an outlet 35. In this example, the ceiling 31 has two inlets 34 and the bottom 32 has six outlets 35.

[0031] Water flows into the case 3 through the inlet 34. The water in the case 3 flows out through the outlet 35. The case 3 is configured so that the inflow rate of water through the inlet 34 is greater than the outflow rate of water through the outlet 35. For example, the number and shape of the inlet 34 and the outlet 35 are set so that the inflow rate through the inlet 34 is greater than the outflow rate through the outlet 35. In this way, the case 3 temporarily holds water.

[0032] Furthermore, when two sets of positive electrode 21, negative electrode 22, and water retention member 23 are housed in case 3, water retention member 23 is exposed from inlet 34, as shown in FIG. 4 . That is, water flowing into case 3 from inlet 34 permeates water retention member 23. Water retention member 23 is also disposed above outlet 35. Therefore, water seeping out from water retention member 23 flows out of case 3 through outlet 35.

[0033] A first lead wire 36a and a second lead wire 36b are connected to the case 3. The first lead wire 36a is electrically connected to the positive electrode 21 of one set. The second lead wire 36b is electrically connected to the negative electrode 22 of the other set. The first lead wire 36a and the second lead wire 36b are connected to the capacitor 6 (see FIG. 3).

[0034] The battery 2 is arranged so that retained water or leachate flows in through the inlet 34. For example, when retained water is to be allowed to flow in, the battery 2 (at least the case 3 and the water retention member 23) is buried in the landfill material 90. This causes the retained water in the landfill material 90 to flow into the case 3 through the inlet 34. When leachate is to be allowed to flow in, the battery 2 (at least the case 3 and the water retention member 23) is arranged in the collection and drainage pipe 94 or the leachate adjustment pond 95. This causes the leachate in the collection and drainage pipe 94 or the leachate adjustment pond 95 to flow into the case 3 through the inlet 34.

[0035] Case 3 stores retained water or leachate. Furthermore, water retention member 23 also stores retained water or leachate. The retained water or leachate stored in case 3 is absorbed by water retention member 23. Positive electrode 21 and negative electrode 22 are in contact with (i.e., immersed in) the retained water or leachate contained in case 3 and water retention member 23. In addition, since case 3 is formed with inlet 34 and outlet 35, the retained water or leachate in case 3 is naturally replaced as appropriate.

[0036] The landfill material 90 contains incineration residue. Soluble chlorides and other substances in the incineration residue dissolve when they come into contact with rainwater. Therefore, the retained water and leachate are what is called an electrolyte and contain a large amount of electrolytes. In other words, the positive electrode 21 and the negative electrode 22 in the case 3 are immersed in the electrolyte. Therefore, an electromotive force is generated between the positive electrode 21 and the negative electrode 22. The generated power is supplied to the capacitor 6 via the first lead wire 36a and the second lead wire 36b. The capacitor 6 stores the power supplied from the battery 2.

[0037] Multiple monitoring devices 10 configured in this manner are installed in various locations in the landfill 9 depending on the information to be detected. Retained water and leachate are present throughout the landfill 9. When the monitoring device 10 is installed in or near the landfill material 90, the battery 2 is installed in the landfill material 90. At least the case 3 and the water retention member 23 are buried in the landfill material 90. When the monitoring device 10 is installed in or near the collection drainage pipe 94 or the leachate adjustment pond 95, the battery 2 is installed in the collection drainage pipe 94 or the leachate adjustment pond 95. At least the case 3 and the water retention member 23 are installed in the collection drainage pipe 94 or the leachate adjustment pond 95. More specifically, the case 3 and the water retention member 23 are immersed in the leachate in the collection drainage pipe 94 or the leachate in the leachate adjustment pond 95. This makes it easy for the battery 2 to secure retained water or leachate as an electrolyte. The battery 2 of each monitoring device 10 generates power from the on-site retained water or leachate, and the generated power is stored in the capacitor 6.

[0038] In operation of the monitoring system 100, the sensor 1 periodically detects information related to the landfill 9, and transmits the detected information to the management device 7 via the communication module 5. The period for acquiring and transmitting the detected information may be different for each monitoring device 10, or may be the same for each monitoring device 10. The management device 7 collects and stores the detected information from the multiple monitoring devices 10. For example, a user reads the detected information from the management device 7 via a terminal 72 as needed. The management device 7 transmits a detection signal to the terminal 72 in response to a request from the terminal 72. The user can check the status of the landfill 9 based on the detected information read by the terminal 72.

[0039] The power required to operate the sensor 1, control unit 4, and communication module 5 of the monitoring device 10 is generated by the battery 2. The battery 2 generates power on-site by utilizing retained water or leachate at various locations in the landfill 9. Therefore, the monitoring device 10 can be freely placed in an appropriate location to obtain the information to be detected, without being restricted by power sources. Furthermore, because retained water and leachate can be secured for the long term in the landfill 9, the battery 2 can generate power stably over the long term.

[0040] Here, the battery 2 has a case 3 that stores the retained water or leachate. The positive electrode 21 and the negative electrode 22 are kept immersed in the retained water or leachate for a long period of time. This allows for stable generation of electricity.

[0041] Furthermore, the case 3 contains a water retention member 23. The water retention member 23 also has the function of storing retained water or leachate. The retained water or leachate stored in the case 3 is absorbed by the water retention member 23. The positive electrode 21 and the negative electrode 22 are maintained in a state of being immersed in the retained water or leachate for a longer period of time. Furthermore, since the water retention member 23 is in contact with the positive electrode 21 and the negative electrode 22, the retained water or leachate is in contact with the positive electrode 21 and the negative electrode 22 for a longer period of time. This results in more stable generation of electricity.

[0042] In addition, case 3 is formed with an inlet 34 and an outlet 35, and is configured so that the retained water or leachate in case 3 can be replaced as needed. A portion of the retained water or leachate in case 3 is replaced with new retained water or leachate, thereby refreshing the electrolyte as needed. This appropriately improves the power generation environment of battery 2. Furthermore, since water retention member 23 is provided in this configuration, the retained water or leachate can be appropriately replaced while the retention time of the retained water or leachate in case 3 can be extended. In other words, it is possible to achieve both stable power generation and an improved power generation environment.

[0043] Furthermore, the sensor 1, the control unit 4, and the communication module 5 operate intermittently to acquire and transmit detection information at predetermined intervals. Meanwhile, the battery 2 generates power constantly. Therefore, the monitoring device 10 is provided with a capacitor 6 that stores the power of the battery 2. As a result, the power generated by the battery 2 while the sensor 1 and other devices are not operating is stored in the capacitor 6 and is used effectively. In addition, by being powered by the capacitor 6, the sensor 1 and other devices can receive a stable power supply without being affected by fluctuations in the amount of power generated by the battery 2.

[0044] As described above, the monitoring device 10 includes a sensor 1 that detects information related to a landfill site 9 that has been filled with landfill material 90 containing incineration residues, and a battery 2 that generates electricity to be supplied to the sensor 1, and the battery 2 has a positive electrode 21 and a negative electrode 22 that are immersed in the water contained in the landfill material 90 or the leachate from the landfill material 90.

[0045] According to this configuration, since the landfill material 90 contains incineration residue, the retained water or leachate functions as an electrolyte. Retained water or leachate is present everywhere in the landfill 9. The monitoring device 10 generates electricity using the retained water or leachate at its installation location, and can secure the power required for the monitoring device 10 itself. Therefore, the monitoring device 10 can be freely placed in an appropriate location relative to the detection target without being restricted by the power source. Furthermore, retained water or leachate is continuously generated in the landfill 9 due to the inflow of rainwater caused by rainfall, etc. In other words, the battery 2 generates power by utilizing the continuously generated retained water or leachate. As a result, the battery 2 can supply power to the monitoring device 10 over the long term.

[0046] Furthermore, the battery 2 further has a water retainer (e.g., a water retention member 23 or a case 3) that stores retained water or leachate, and the positive electrode 21 and the negative electrode 22 are immersed in the retained water or leachate contained in the water retainer.

[0047] According to this configuration, the retained water or leachate is stored in the water retention member 23 or the case 3, so that the positive electrode 21 and the negative electrode 22 can be kept in contact with the retained water or leachate for a long period of time. As a result, the battery 2 can stably supply power.

[0048] The water-retaining member 23 or the case 3 is buried in the landfill material 90 .

[0049] According to this configuration, since the landfill material 90 is present around the water-retentive member 23 or the case 3, the water-retentive member 23 or the case 3 can easily take in the water held in the landfill material 90. In other words, the water-retentive member 23 or the case 3 can easily secure the held water.

[0050] Furthermore, the water retention member 23 or the case 3 is installed in a drainage pipe 94 that collects leachate in the landfill 9.

[0051] According to this configuration, the water retention member 23 or the case 3 stores the leachate in the collection and discharge pipe 94, so that the positive electrode 21 and the negative electrode 22 are substantially immersed in the leachate in the collection and discharge pipe 94. Leachate often flows through the collection and discharge pipe 94. Therefore, the water retention member 23 or the case 3 can easily take in and store the leachate. As a result, it becomes easy to maintain the positive electrode 21 and the negative electrode 22 immersed in the leachate, and the battery 2 can stably supply power.

[0052] Alternatively, the water retention member 23 or the case 3 is installed in a leachate adjustment pond 95 (storage portion) that stores leachate recovered from the landfill 9.

[0053] According to this configuration, the water retention member 23 or the case 3 stores the leachate in the leachate adjustment pond 95, so that the positive electrode 21 and the negative electrode 22 are essentially immersed in the leachate in the leachate adjustment pond 95. Leachate is often stored in the leachate adjustment pond 95. Therefore, the water retention member 23 or the case 3 can easily take in and store the leachate. As a result, it becomes easier to maintain the positive electrode 21 and the negative electrode 22 immersed in the leachate, and the battery 2 can stably supply power.

[0054] The water reservoir of the monitoring device 10 also includes a case 3 that houses the positive electrode 21 and the negative electrode 22 and stores retained water or leachate.

[0055] According to this configuration, the case 3 stores the retained water or the leachate, so that the positive electrode 21 and the negative electrode 22 can be easily maintained in a state where they are immersed in the leachate.

[0056] Furthermore, the case 3 is formed with an inlet 34 through which the retained water or leachate flows in, and an outlet 35 through which the retained water or leachate flows out.

[0057] According to this configuration, retained water or leachate flows into the case 3 through the inlet 34, and the retained water or leachate flows out of the case 3 through the outlet 35. This allows the retained water or leachate in the case 3 to be replaced as needed.

[0058] Furthermore, the inflow rate of retained water or leachate through inlet 34 is greater than the outflow rate of retained water or leachate through outlet 35 .

[0059] With this configuration, the flow rate of retained water or leachate into case 3 is greater than the flow rate of retained water or leachate out of case 3, so that in case 3, there tends to be an excess of retained water or leachate rather than a shortage. As a result, it becomes easier to maintain the state in which positive electrode 21 and negative electrode 22 are immersed in leachate, and power can be supplied stably by battery 2.

[0060] The water retainer of the monitoring device 10 also includes a water retention member 23 that is sandwiched between the positive electrode 21 and the negative electrode 22 and absorbs retained water or leachate.

[0061] According to this configuration, the water retention member 23 retains the retained water or leachate and brings the retained water or leachate into contact with the positive electrode 21 and the negative electrode 22. As a result, it becomes easier to maintain the positive electrode 21 and the negative electrode 22 in a state immersed in the leachate, and the battery 2 can stably supply power.

[0062] Furthermore, the monitoring device 10 further includes a capacitor 6 that stores power from the battery 2, and the sensor 1 is supplied with power via the capacitor 6.

[0063] According to this configuration, power from the battery 2 is temporarily stored in the capacitor 6. The sensor 1 is powered by the capacitor 6. The power from the battery 2 may fluctuate depending on the amount and state of the retained water or leachate (i.e., the electrolyte). By temporarily storing the power from the battery 2 in the capacitor 6 and then supplying power from the capacitor 6 to the sensor 1, it is possible to supply stable power to the sensor 1. In addition, power generated by the battery 2 while the sensor 1 is not operating is also stored in the capacitor 6. Therefore, the power from the battery 2 can be used effectively without being wasted.

[0064] Other Embodiments As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology of the present disclosure is not limited to this and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate. Furthermore, the components described in the above embodiment can be combined to create new embodiments. Furthermore, the components described in the accompanying drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the technology. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately determining that these non-essential components are essential.

[0065] For example, the monitoring device 10 is applied to the monitoring system 100, but is not limited to this. The monitoring device 10 may be used alone. Furthermore, the structure of the landfill 9 described above is merely an example, and is not limited to this.

[0066] The monitoring device 10 does not have to voluntarily transmit the information detected by the sensor 1. In that case, the monitoring device 10 may store the information detected by the sensor 1. Then, the monitoring device 10 may output the stored information detected in response to an external request.

[0067] The communication module 5 of the monitoring device 10 is not limited to wireless communication and may be wired communication. If the communication module 5 is wired communication, power to the communication module 5 may be supplied from an external source via a wire, not from the battery 2.

[0068] The sensor 1 and the battery 2 do not have to be physically separated from the main body 11. In other words, the sensor 1 and the battery 2 may be formed integrally with the main body 11.

[0069] The number of pairs of positive electrodes 21 and negative electrodes 22 in the battery 2 is not limited to two, and may be one pair or three or more pairs. Alternatively, the monitoring device 10 may have two or more batteries 2 connected in series.

[0070] The battery 2 does not need to have a case 3. In that case, the positive electrode 21 and the negative electrode 22 are buried directly in the landfill material 90, or the positive electrode 21 and the negative electrode 22 are directly immersed in the leachate in the drainage pipe 94 or the leachate adjustment pond 95. In that case, it is preferable that a water retention member 23 is provided between the positive electrode 21 and the negative electrode 22.

[0071] Alternatively, the battery 2 may have a case 3 but not have a water retention member 23. The positive electrode 21 and the negative electrode 22 are immersed in retained water or leachate stored in the case 3. In this case, it is preferable to make the outlet 35 small to reduce the amount of retained water or leachate that flows out of the case 3. This makes it possible to extend the time that the retained water or leachate is stored in the case 3, even without the water retention member 23.

[0072] The materials of the electrode 21 and the negative electrode 22 are not limited to the above-mentioned materials. [Explanation of symbols]

[0073] 10 Monitoring equipment 1 sensor 2 batteries 21 Positive electrode 22 Negative electrode 23 Water retention material (water retainer) 3 Case (Water Retainer) 34 Inlet 35 Outlet 9. Landfill 90 Landfill material 94 Collection and drainage pipe 95 Leachate adjustment pond (storage area)

Claims

1. a sensor for detecting information related to a landfill site filled with landfill materials containing incineration residues; a battery that generates power to be supplied to the sensor; The battery is a monitoring device having a positive electrode and a negative electrode that is immersed in the water contained in the landfill material or in the leachate from the landfill material.

2. 2. The monitoring device according to claim 1, The battery further includes a water reservoir for storing the retained water or the leachate, The positive electrode and the negative electrode of the monitoring device are immersed in the retained water or the leachate contained in the water retainer.

3. 3. The monitoring device according to claim 2, The water retainer is a monitoring device buried in the landfill material.

4. 3. The monitoring device according to claim 2, The water retainer is a monitoring device installed in a collection drainage pipe that collects the leachate at the landfill site.

5. 3. The monitoring device according to claim 2, The water reservoir is a monitoring device installed in a storage section that stores the leachate recovered from the landfill.

6. 6. The monitoring device according to claim 2, The water reservoir is a monitoring device that includes a case that houses the positive electrode and the negative electrode and stores the retained water or the leachate.

7. 7. The monitoring device according to claim 6, The case is a monitoring device having an inlet through which the retained water or the leachate flows in and an outlet through which the retained water or the leachate flows out.

8. 8. The monitoring device according to claim 7, A monitoring device wherein the flow rate of the retained water or the leachate entering through the inlet is greater than the flow rate of the retained water or the leachate exiting through the outlet.

9. 9. The monitoring device according to claim 2, The water retainer is a monitoring device including a water retention member sandwiched between the positive electrode and the negative electrode and absorbing the retained water or the leachate.

10. 6. The monitoring device according to claim 1, further comprising a capacitor for storing power from the battery; The sensor is powered via the capacitor.

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