Co2 desorption state detection device and co2 desorption state detection system

Abstract

To provide a CO2 desorption state detection device that can determine a section where CO2 has been desorbed from incineration ash at a deposition site based on the hydrogen ion exponent.SOLUTION: A CO2 desorption state detection device, which detects a desorption state of CO2 fixed in waste, is composed of drainage pipes 21, 23 placed at a base of a waste deposition site where waste is accumulated, a gas vent pipe 25 connected to the drainage pipes 21, 23 and extending vertically upward from the drainage pipes 21, 23, and a sensor 3 attached to the drainage pipes 21, 23 via the gas vent pipe 25 and measuring the hydrogen ion exponent of wastewater W flowing through the drainage pipes 21, 23.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide (hereinafter referred to as "CO2") desorption state detection device and a CO2 desorption state detection system. [Background technology]

[0002] It is known that an increase in the amount of CO2 released into the atmosphere leads to temperature rises and the associated occurrence of abnormal weather. To prevent this, basic experiments are being conducted to fix CO2 in cement and concrete-based materials and reduce the amount of CO2 released into the atmosphere. Such technology is described, for example, in Non-Patent Document 1. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Hideo Komine et al., Fundamental Research on the Creation of Carbon Capture Urban Environments Using CO2 Fixation Materials, Journal of the Japan Society of Civil Engineers, Vol. 79, No. 1, 2023. Summary of the Invention [Problem to be solved by the invention]

[0004] However, when waste is buried as in Non-Patent Document 1, it is conceivable that the waste buried in the dump (landfill) will become acidic due to the characteristics of the waste or the environment. If the waste becomes acidic, there is a risk that the CO2 fixed in the waste will be desorbed from the waste and released back into the atmosphere. The inventors of the present application have focused on this point and have an object to provide a CO2 desorption state detection device and CO2 desorption state detection system that can determine the compartments in the dump where CO2 has desorbed from the waste based on the hydrogen ion exponent. [Means for solving the problem]

[0005] In order to achieve the above object, one form of the CO2 desorption state detection device of the present invention is a CO2 desorption state detection device that detects the desorption state of CO2 fixed in a CO2 fixation material, and includes: a drain pipe placed at the base of a deposition site where the CO2 fixation material is deposited; a gas vent pipe connected to the drain pipe and extending vertically upward from the drain pipe; and a sensor that is attached to the drain pipe via the gas vent pipe and measures the hydrogen ion exponent of the wastewater flowing through the drain pipe.

[0006] One form of the CO2 desorption state detection system of the present invention is a CO2 desorption state detection system that detects the desorption state of CO2 fixed in a CO2 fixation material, and includes a server device that collects the pH of wastewater flowing through the drainage pipe from a sensor installed in a gas vent pipe that extends vertically upward from a drainage pipe located at the base of a deposition site where the CO2 fixation material is deposited, and the server device determines an acidic range that is at least acidic for the CO2 fixation material deposited in the deposition site based on the sensor pH detected by at least some of the multiple sensors and the position of the sensor that detected this sensor pH. [Effects of the Invention]

[0007] According to the above-described aspects, it is possible to provide a CO2 desorption state detection device and a CO2 desorption state detection system that can determine the compartment from which CO2 has been desorbed in a deposition field based on the hydrogen ion exponent. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a top view for explaining a treatment plant to which a CO2 desorption state detection device according to one embodiment of the present invention is applied. [Figure 2] 2A is a cross-sectional view taken along line IIA-IIA shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB shown in FIG. [Figure 3] FIG. 2 is a perspective view of a range III shown in FIG. [Figure 4] FIG. 2 is a functional block diagram for explaining a CO2 desorption compartment determination unit according to one embodiment of the present invention. [Figure 5]2 is a diagram showing a predetermined region centered on a gas vent pipe where a CO2 desorption compartment determination section was detected to be acidic in the treatment plant shown in FIG. 1. FIG. [Figure 6] FIG. 10 is a top view for explaining a modified example of a treatment plant to which a CO2 desorption state detection device according to one embodiment of the present invention is applied. [Figure 7] 7A is a cross-sectional view taken along line VIIA-VIIA shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along line VIIB-VIIB shown in FIG. [Figure 8] FIG. 7 is a perspective view of a range VIII shown in FIG. 6. [Figure 9] FIG. 7 is a diagram showing a predetermined region centered on the gas vent pipe where the CO2 desorption compartment determination section was detected to be acidic in the treatment plant shown in FIG. 6. [Figure 10] FIG. 10 is a top view for explaining another modified example of a treatment plant to which a CO2 desorption state detection device according to one embodiment of the present invention is applied. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a description will be given of a CO2 desorption state detection device and a CO2 desorption state detection system according to one embodiment of the present invention. The drawings used in this embodiment are intended to explain the configuration, arrangement of each part, function, action, and effect of the present invention, and do not limit the specific shape, aspect ratio, etc. of the present invention.

[0010] [Drainage pipe and sensor] FIG. 1 is a top view illustrating a waste deposition site (hereinafter referred to as "treatment site") 1 to which the CO2 desorption state detection device of this embodiment is applied. The treatment site 1 includes multiple areas where waste can be deposited. In this embodiment, each area in the treatment site 1 where waste can be deposited will be referred to as a "section." In the following, this embodiment will be described based on the x, y, and z coordinates shown in FIG. 1.

[0011] The waste material deposited in the treatment plant 1 is, for example, the incineration ash of industrial waste with CO2 adsorbed thereto. In this case, the incineration ash corresponds to a "combustion by-product," and the combustion by-product with CO2 adsorbed thereto functions as a "fixation material" for CO2. In this specification, industrial waste will be simply referred to as "waste." Figure 2(a) is a schematic cross-sectional view taken along line IIA-IIA in Figure 1, and Figure 2(b) is a schematic cross-sectional view taken along line IIB-IIB. Note that soil and other materials surrounding the drainage pipes 21 and 23 are omitted from Figure 2(b). Figure 3 is a perspective view of area III in Figure 1. As shown in Figure 1, the treatment plant 1 includes a trunk line 21 that crosses the treatment plant 1 longitudinally and multiple branch lines 23 that extend from the trunk line 21 in a direction intersecting the trunk line 21. The main line 21 and the branch line 23 are collectively referred to as drainage pipes 21 and 23. In the x, y, and z coordinates in Figure 1, the x-axis is set along the main line 21, and the y-axis is set along the branch line 23. The z-axis is set in a direction opposite to the direction of gravity from the ground.

[0012] A gas vent pipe 25 is connected to the main line 21 of the drain pipes 21, 23 to release gas generated in the drain pipes 21, 23 to the outside. In this embodiment, as shown in FIG. 1, gas vent pipes 25a to 25d are connected along the x direction (longitudinal direction) of the main line 21. When there is no need to distinguish between the gas vent pipes 25a to 25d, they are also referred to as gas vent pipes 25. The gas vent pipes 25 extend vertically upward (z direction) from the main line 21.

[0013] The area where waste is deposited at the treatment plant 1 is a concave area where the soil has been dug out from the flat ground. Contour lines are shown between the edge 13, which is at the same height as the flat ground of the area, and the lowest bottom 11. Outside the edge 13, there is a water intake tower 50, and wastewater flowing through the main line 21 flows toward the water intake tower 50.

[0014] As shown in FIG. 2(a), the recessed area 101 is formed by digging down into the soil 100. The base 101a of the recessed area 101 forms a slope that decreases in the -x direction in FIG. 2(a). The end of the main line 21 facing the relatively lower side of the slope is connected to the water intake tower 50 by a pipe (not shown). Also, as shown in FIG. 1, the base 101a of the recessed area 100 decreases in height from both sides toward the main line 21. Therefore, as shown in FIGS. 2(b) and 3, the end 231 of the branch line 23 that connects to the main line 21 is lower than the other end.

[0015] The drainage pipes 21 and 23 are permeable pipes. A waterproof sheet 28 is placed between the base 101a and the drainage pipes 21 and 23, and soil (not shown) may be deposited between the drainage pipes 21 and 23 and the waterproof sheet 28. In addition, a layer of a water-permeable member 29 is formed on the upper part of the drainage pipes 21 and 23.

[0016] The permeable pipe may be a pipe drain made of plastic such as polyvinyl chloride or polypropylene. The permeable pipe may have any function as long as it allows water to flow inside, allows water from the outside to permeate inside, and prevents waste from entering. The permeable member 29 may be a member that allows water leaching from waste to pass into the drainage pipes 21, 23 but does not allow waste to pass through. The permeable member 29 of this embodiment may be, for example, a member formed by encasing crushed stone in a wire mesh or the like. In this embodiment, by covering the drainage pipes 21, 23 with such a member, only water leaching from the waste can pass through the drainage pipes 21, 23, preventing waste from entering the drainage pipes 21, 21. Furthermore, this configuration of this embodiment prevents the drainage pipes 21, 23 from being damaged by the weight of the accumulated waste.

[0017] The gas venting pipe 25 extends vertically upward (in the z-direction) from the main line 21. As shown in FIG. 3 , in this embodiment, the sensor 3 is provided within the main line 21 via the gas venting pipe 25. The sensor 3 is a pH sensor that measures the pH of the wastewater W flowing through the main line 21. The sensor 3 includes, for example, a sensor head 31 including a glass electrode and a wire 32 that transmits an electrical signal to the outside according to the value of the current flowing through the glass electrode. The sensor 3 is suspended from the upper end 251 of the gas venting pipe 25 by the wire 32, and is installed so that at least a portion of the sensor head 31 is located inside the main line 21. Note that the gas venting pipe 25 is provided at a position on the main line 21 excluding the intersection with the branch line 23, but is not limited to such a position. However, providing the gas venting pipe 25 at a position on the main line 21 excluding the intersection with the branch line 23 is preferable because it is less affected by the wastewater flowing through the branch line 23 and allows for accurate detection of the pH of the wastewater W flowing through the main line 21.

[0018] In this embodiment, a plurality of gas vent pipes 25 are connected to the main line 21, and each of the pipes is provided with a sensor 3. The CO2 desorption state detection device of this embodiment is equipped with a communication device 35 that transmits an electrical signal output from the sensor head 31 via a wire 32 to a CO2 desorption compartment determination unit 4 (FIG. 4) wirelessly, for example, via a network line. The CO2 desorption compartment determination unit 4 will be described in detail later.

[0019] When waste is deposited in the recessed region 101, water (wastewater) W seeping out from the waste passes through the permeable member 29 and reaches the drainage pipes 21 and 23. The sensor head 31 comes into contact with the wastewater W flowing through the main line 21 and detects the pH of the wastewater W. The pH is detected by generating a pH signal corresponding to the current flowing through the electrodes of the sensor head 31. The pH signal is transmitted to the communication device 35 via the wire 32. In this embodiment, a code identifying each of the sensors 3 is assigned to each sensor 3 in advance. The pH signal is then transmitted to the communication device 35 along with the code. The communication device 35 transmits the pH signal and the code corresponding to the pH signal to the CO2 desorption compartment determination unit 4. The pH signal may be transmitted via a network, wireless communication other than a network, or even wired communication. In this embodiment, the communication device 35 corresponds to a transmitter.

[0020] Furthermore, the wastewater W flowing through each branch line 23 flows from the relatively higher end toward the lower end 231 connected to the main line 21, and then flows into the main line 21. The wastewater W that flows into the main line 21 flows from the relatively higher side to the lower side within the main line 21, and is collected in the water intake tower 50 via other drainage pipes connected to the main line 21.

[0021] [CO2 desorption compartment determination section] FIG. 4 is a functional block diagram illustrating the CO2 desorption compartment determination unit 4. As shown in FIG. 4, the CO2 desorption compartment determination unit 4 includes a communication unit 41 that receives a signal transmitted from the communication device 35. The signal received by the communication unit 41 includes the aforementioned pH signal and a code identifying each sensor 3. Note that this embodiment is not limited to receiving pH signals from all of the multiple sensors 3, but may receive pH signals from at least some of the sensors 3. For example, it is conceivable to stop the operation of sensors 3 installed in compartments where CO2 desorption is not an issue or in compartments where waste has not yet accumulated. Furthermore, if it is empirically determined that a coarse granularity in the detection of pH values ​​is acceptable, it is conceivable to stop the operation of some sensors 3. In this way, it is possible to obtain the information necessary for detection while reducing the power required for the operation of the sensors 3 or the processing load on the communication device 35 and the CO2 desorption compartment determination unit 4.

[0022] In the CO2 desorption compartment determination unit 4, first, the desorption determination unit 43 determines whether the wastewater W to be detected by the sensor 3 is acidic or not based on the hydrogen ion exponent (hereinafter referred to as "sensor pH") detected by each sensor 3. Here, "acidic" means that the hydrogen ion exponent indicated by the pH signal is less than 7.

[0023] Here, the desorption estimation unit 45 has in advance data associating the code transmitted together with the pH signal with the position of the sensor 3 identified by this code in the treatment plant 1. Then, for the sensor 3 for which the desorption determination unit 43 has determined that the wastewater W to be detected is acidic, the desorption estimation unit 45 identifies the position of the sensor 3 corresponding to the code, and determines the desorption zone from which CO2 is desorbed in the treatment plant 1 based on the position of this sensor 3, as will be described later in FIG. 5. Note that the sensor 3 determined to be acidic may be displayed on a display or the like, and an operator may determine the desorption zone instead of the desorption estimation unit 45.

[0024] Furthermore, in this embodiment, if the pH is 7, it may be determined that the compartment in which the sensor 3 is installed is likely to become acidic. Furthermore, in this embodiment, after determining that the pH is less than 7, i.e., acidic, it may be determined that the pH value does not affect CO2 desorption. Such determinations can be arbitrarily applied depending on, for example, the characteristics of each treatment plant and the characteristics of the waste. Furthermore, the desorption determination unit 43 detects an area that is at least acidic to detect CO2 desorption and determines this as a desorption compartment. However, this embodiment is not limited to this configuration, and may simultaneously determine the neutrality or alkalinity and the degree of alkalinity of each compartment in addition to the degree of acidity.

[0025] The communication unit 41, desorption determination unit 43, and desorption compartment estimation unit 45 included in the CO2 desorption compartment determination unit 4 described above are all realized by the cooperation of well-known hardware such as a CPU (Central Processor Unit), memory for at least temporarily storing information necessary for CPU processing, and work memory used for CPU processing, and software such as a program executed on the hardware.

[0026] [CO2 desorption detection system] In this embodiment, a CO2 desorption compartment determination unit 4 may be provided for each treatment plant 1 or for each administrator who manages the treatment plant 1, and may be combined with the drainage pipes 21, 23 and the sensor 3 to form a CO2 desorption state detection device. In this embodiment, the CO2 desorption compartment determination unit 4 may be configured as a server device to create a cloud system. The CO2 desorption compartment determination unit 4 configured as a server device may collect pH signals from multiple treatment plants 1 managed by different administrators, and provide the results of CO2 desorption compartment determination or estimation to each administrator.

[0027] [CO2 desorption compartment determination] Next, a process for determining the CO2 desorption compartment using the above-described configuration will be specifically described. Fig. 5 is a diagram illustrating a detection example of the CO2 desorption compartment when the pH measured by the sensors 3 installed in the gas vent pipes 25c and 25d among the gas vent pipes 25a to 25d indicates acidity.

[0028] 5, the desorption determination unit 43 determines that the sensor pH detected by the sensors 3 (hereinafter referred to as sensors 3c and 3d) disposed in the gas vent pipes 25c and 25d is acidic. A The desorption estimation unit 45 determines that the area upstream of the sensors 3c and 3d is the desorption area in the direction of the flow of the wastewater W, which is determined by the inclination of the drainage pipes 21 and 23 and the positions of the sensors 3c and 3d. On the other hand, since the sensor pH detected by the sensors 3 arranged in the gas vent pipes 25a and 25b is not acidic, the area upstream of these sensors is not determined to be the desorption area. From the above results, the desorption estimation unit 45 determines that the area downstream of the gas vent pipe 25b and upstream of the gas vent pipe 25d in the direction along the main line 21 is the area where the branch line 23 is upstream of the main line 21. A is estimated or determined to be the detached compartment.

[0029] In this embodiment, the desorption estimation unit 45 makes the above determination by referring to a table that associates combinations of positions of sensors 3 for which the sensor pH is determined to be acidic with corresponding desorption compartments. In this table, for example, if the sensor pH of only the sensor 3 (sensor 3c) arranged in the vent pipe 25c is determined to be acidic, the desorption compartment is a region downstream of the vent pipe 25b and upstream of the vent pipe 25c in the direction along the main line 21, where the branch line 23 is upstream of the main line 21. Note that this detection example means that it can be estimated that desorption has occurred in a region downstream of the vent pipe 25b and upstream of the vent pipe 25c, but that desorption has not occurred in a region downstream of the vent pipe 25c and upstream of the vent pipe 25d. In this case, it can also be assumed that the acidic wastewater W flowing out from the area downstream of the gas venting pipe 25b and upstream of the gas venting pipe 25c becomes non-acidic while passing through the area downstream of the gas venting pipe 25c and upstream of the gas venting pipe 25d and being introduced into the drainage pipes 21, 23 of that area.

[0030] According to the present embodiment described above, the sensor 3 is installed on the main line 21 via the gas vent pipe 25 connected to the main line 21. This allows the sensor 3 to be installed using the existing configuration of the treatment plant 1. This reduces the burden of installing a new sensor 3 installation unit, simplifies the configuration of the CO2 desorption state detection device, and reduces costs. Furthermore, in this embodiment, the sensor 3 is suspended from the gas vent pipe 25 that extends vertically upward relative to the main line 21. This allows the sensor 3 to contact the wastewater W within the main line 21 of the drainage pipe regardless of the amount of sediment. That is, when the amount of waste increases and its height increases, the gas vent pipe 25 is spliced, so that its gas release port is always exposed above ground. According to this embodiment, the desorption state of CO2 adsorbed on the waste can be monitored based on the pH of the waste, and sections where CO2 has desorbed or is at risk of desorption can be identified.

[0031] [Application to reclamation planning] Next, a new waste landfill plan based on the CO2 desorption state of this embodiment will be described. As described above, this embodiment is not limited to detecting only acidity among pH values, but can also detect neutrality and alkalinity. Therefore, when depositing (landfilling) new waste at the treatment site 1, it may be possible to avoid depositing it near a section where the waste already deposited is acidic. Note that "near" here may mean, for example, when two sections are adjacent and in direct contact with each other, when the edge portions of the two sections are less than a predetermined distance threshold, or when the length of the boundary between the two sections is greater than a predetermined distance threshold.

[0032] Furthermore, this embodiment focuses on the fact that the pH immediately after incineration varies depending on the type and characteristics of the waste, and it is considered that waste that is highly acidic immediately after incineration is landfilled in a compartment away from the compartments where other waste is piled up. Furthermore, this embodiment considers that waste that is highly alkaline immediately after incineration is piled up near the compartment where waste determined to be acidic by the CO2 desorption compartment determination unit 4 of this embodiment is piled up, thereby accelerating the neutralization of the acidic waste.

[0033] [Variation 1] Next, a first modification of the embodiment described above will be described. FIG. 6 is a top view illustrating the first modification. As shown in FIG. 6, the first modification differs from the embodiment in that gas vent pipes 25e to 25t are connected to branch line 23 instead of trunk line 21. FIG. 7(a) is a cross-sectional view taken along line VIIA-VIIA shown in FIG. 6, and FIG. 7(b) is a cross-sectional view taken along line VIIB-VIIB. FIG. 8 is a perspective view of range VIII shown in FIG. 6. Note that in the first modification, the same components as those shown in the embodiment are denoted by the same reference numerals, and some of the descriptions thereof will be omitted.

[0034] As shown in Figures 6, 7(a), 7(b), and 8, Variation 1 differs from the embodiment in that degassing pipes 25e to 25t are provided in each of the branch lines 23, and sensors 3 are connected to these degassing pipes 25. Providing the degassing pipe 25 in the center of the branch lines 23 is preferable because it is less affected by the wastewater flowing through the main line 21 and can detect the average hydrogen ion exponent of the wastewater W flowing through each branch line 23. However, this embodiment is not limited to the example in which a degassing pipe 25 is provided in each of the branch lines 23. For example, the degassing pipes 25 do not have to be connected to all of the branch lines 23, but may be connected to some of the branch lines 23. Furthermore, the degassing pipes 25 are not limited to being connected to each branch line 23 individually, but multiple degassing pipes 25 may be connected to one branch line 23, and their positions are arbitrary.

[0035] Next, a process for determining the CO2 desorption compartment in Modification 1 will be described. Table 1 shows the pH values ​​measured by the sensors 3 installed in the gas vent pipes 25e to 25t (indicated by e to t in Table 1) as "acid (acidic)," "neutral (neutral)," and "alkaline (alkaline)." Figure 9 is a diagram illustrating the desorption compartments detected as acidic based on the position of the sensor 3 in the gas vent pipe 25, among the pH values ​​shown in Table 1.

[0036] Table 1 TIFF2025127343000002.tif62129

[0037] 9, the desorption determination unit 43 determines that the sensors 3 in the gas vent pipes 25e, 25f and the gas vent pipes 25l, 25m, and 25n determine that the wastewater W is acidic. Then, similar to the above-described embodiment, the desorption estimation unit 45 determines that the region upstream of the sensor 3 in the direction in which the wastewater W flows is the desorption section. That is, the desorption estimation unit 45 determines that the region R B , R C This is presumed or judged to be the detached compartment.

[0038] [Variation 2] Fig. 10 is a top view for explaining Modification 2. Modification 2 differs from the embodiment and Modification 1 in that gas vent pipes 25a to 25d are connected to trunk line 21 and gas vent pipes 25e to 25t are connected to branch line 23. In Modification 2, the same components as those shown in Fig. 1 are denoted by the same reference numerals, and some of the descriptions thereof will be omitted.

[0039] Table 2 shows the hydrogen ion exponents measured by sensors 3 installed in gas vent pipes 25a to 25t (indicated as a to t in Table 1) as "acid (acidic)," "neutral (neutral)," and "alkaline (alkaline)."

[0040] Table 2 TIFF2025127343000003.tif83144

[0041] 10, the desorption determination unit 43 determines that the sensors 3 in the gas vent pipes 25a, 25e, 25f and the gas vent pipes 25d, 25l, 25m, 25n determine that the wastewater W is acidic, as in the example shown in FIG. 9. Then, the desorption estimation unit 45 determines, as in the above-described embodiment, the region upstream of the sensor 3 in the direction in which the wastewater W flows, as the desorption section. That is, the desorption estimation unit 45 determines that the region R P , R E This is presumed or judged to be the detached compartment. [Explanation of symbols]

[0042] 1. Treatment Plant 3 sensors 4 CO2 desorption compartment determination section 11 plots 13 areas 21, 23 Drainage pipes (main line, branch line) 21 Main line 25 Gas vent pipe 28 Tarpaulin 29 Permeable material 31 Sensor head 32 wires 35 Communication equipment 41 Communications Department 43 Detachment determination unit 45 Desorption estimation section 47 Display section 50 Water intake tower 100 Sat 101 Concave area 101a base 231 End 251 Upper end

Claims

1. Carbon dioxide (hereinafter referred to as CO 2 ) CO immobilized in the immobilization material 2 Detecting the desorption state of CO 2 A desorption state detection device, The CO 2 a drainage pipe disposed at the base of the deposition site where the immobilization material is deposited; a gas vent pipe connected to the drain pipe and extending vertically upward from the drain pipe; a sensor that is provided in the drain pipe via the gas vent pipe and that measures the hydrogen ion exponent of the wastewater flowing through the drain pipe; CO 2 Desorption state detection device.

2. a determination means for determining whether a sensor pH value is acidic or not based on a plurality of the gas vent pipes provided at the deposition site, the plurality of gas vent pipes being provided at the drainage pipe and the position of the sensor that detected the sensor pH value; The CO of claim 1 further comprising 2 Desorption state detection device.

3. 10. The CO sensor of claim 1, wherein the sensor is suspended vertically within the vent pipe and is at least partially disposed in the drain pipe. 2 Desorption state detection device.

4. The determining means determines whether the sensor pH is acidic by determining whether the immobilized CO 2 The CO 2 CO, a section of immobilized material 2 an estimation means for estimating the desorption compartment; 3. The CO of claim 2, further comprising: 2 Desorption state detection device.

5. The information indicating the hydrogen ion exponents detected by the plurality of sensors is transmitted to the CO 2 The CO2 sensor according to claim 4, further comprising a transmitter for transmitting to the detachment section determination unit. 2 Desorption state detection device.

6. CO 2 CO immobilized in the immobilization material 2 Detecting the desorption state of CO 2 A desorption state detection system, comprising: The CO 2 a server device that collects, from a sensor provided in a gas vent pipe that extends vertically upward from a drainage pipe disposed at the base of a deposition site where the immobilization material is deposited, the pH of wastewater flowing through the drainage pipe; The server device The CO 2 deposited in the deposition site is calculated based on the sensor pH detected by at least some of the plurality of sensors and the position of the sensor that detected the sensor pH. 2 Determine the acid range of the immobilization material that is at least acidic. 2 Desorption state detection system.

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