Experimental device and method for simulating carbon emissions from anaerobic degradation of easily degradable organic matter-contaminated soil

Abstract

The present invention discloses an experimental device and method for simulating carbon emissions from anaerobic degradation of easily degradable organic matter-contaminated soil, comprising an anaerobic control system, a contaminated soil system simulation system, a greenhouse gas monitoring system, and a data acquisition and analysis system; the contaminated soil system simulation system is used to hold contaminated soil, and can simulate the ground stress corresponding to different stratum depths as needed, and maintain the simulated ground stress stable during the entire anaerobic degradation process; the anaerobic control system is used to deliver a stable flow of nitrogen to a soil sample barrel to form a stable anaerobic environment; the carbon-containing gas generated by the anaerobic degradation of the contaminated soil flows along with the nitrogen to the greenhouse gas monitoring system for gas type and content detection, and each detection data is fed back to the data acquisition and analysis system. Since the present invention creates a stable ground stress and anaerobic environment, the data required for anaerobic degradation at different stratum depths can be accurately obtained, which is convenient for providing data support for subsequent research on carbon emissions from contaminated soil.

Description

Technical Field

[0001] The present invention relates to an experimental device and method for simulating carbon emissions from anaerobic degradation of easily degradable organic matter-contaminated soil, specifically an experimental device and method for simulating and studying the emission characteristics of greenhouse gases such as CH4 and CO2 during the anaerobic degradation of organic matter in easily degradable organic matter-contaminated soil, belonging to the field of environmental engineering geology technology. Background Art

[0002] The soil carbon pool is the largest carbon pool in the Earth's terrestrial ecosystem and is closely related to greenhouse gas emission reduction and sink enhancement. Soil organic carbon is the most active part of the soil carbon pool and is extremely susceptible to environmental changes, especially human disturbances. It is the key to soil carbon migration. Current research on soil carbon pools mostly uses methods such as on-site typical profile sampling and measurement, indoor pot experiments, and field test field experiments. It pays more attention to the characteristics of soil organic carbon content and the response of vegetation growth. The test research scope is mainly concentrated in the soil within a depth of 1 meter, and the degradation of soil organic matter is mainly aerobic degradation.

[0003] For contaminated soils containing large amounts of easily degradable organic pollutants, formed by agricultural, domestic, and industrial sources, the degradation of these organic pollutants leads to significant changes in soil composition and structure, causing soil degradation and weakening, seriously affecting soil cultivability and the safety and stability of soil engineering activities. At the same time, with the intrusion of organic pollutants and a significant increase in soil organic carbon content, organic pollutants undergo multi-dimensional and rapid migration and transformation, making soils a serious source of greenhouse gas emissions. Compared with uncontaminated soils, organically contaminated soils have higher organic matter content, deeper distribution, and a predominantly anaerobic environment, often exhibiting characteristics of carbon emissions.

[0004] In summary, organically contaminated soils are a significant source of carbon emissions from the soil carbon pool. The carbon emission characteristics during anaerobic degradation are crucial indicators for evaluating soil carbon sources and sinks and for assessing carbon sequestration and remediation technologies for contaminated soils. However, there is currently no instrumentation or equipment to study the anaerobic degradation characteristics of organic matter in contaminated soils, making it difficult to accurately obtain relevant data and, consequently, hinder subsequent research. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a simulation experimental device and method for anaerobic degradation of carbon emissions from easily degradable organic matter contaminated soil, which can simulate an anaerobic environment and simulate the pressure of strata at different depths, so that anaerobic degradation of organic matter experiments can be carried out on contaminated soil in a simulated environment, and ultimately the data required for anaerobic degradation can be accurately obtained, which is convenient for providing data support for subsequent research on carbon emissions from contaminated soil.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an experimental device for anaerobic degradation of carbon emissions from easily degradable organic matter-contaminated soil, comprising an anaerobic control system, a contaminated soil system simulation system, a greenhouse gas monitoring system, and a data acquisition and analysis system;

[0007] The contaminated soil system simulation system includes a displacement control box, a reaction frame, a soil sample barrel, a loading baffle, a force sensor and a force transmission shaft; the displacement control box is provided with a displacement transmission shaft on the upper part, and a tray is provided on the upper end of the displacement transmission shaft, and the displacement control box controls the displacement transmission shaft to move up and down to drive the tray to move synchronously; the reaction frame is fixed on the upper part of the displacement control box, and the soil sample barrel is fixed on the tray for holding the contaminated soil sample; the upper end of the soil sample barrel is provided with a sealing cover, and a central through hole, an air inlet and an air outlet are provided on the sealing cover, the force sensor is located above the soil sample barrel, and its upper end is fixedly connected to the reaction frame, and the lower end of the force sensor is fixedly connected to one end of the force transmission shaft. Then, the other end of the force transmission shaft passes through the central through hole and extends into the soil sample barrel. The other end of the force transmission shaft is fixedly connected to the loading baffle through a connector, and the force sensor, the force transmission shaft and the displacement transmission shaft are all on the axis of the soil sample barrel. When it is necessary to apply pressure to the contaminated soil sample, the displacement control box drives the tray and the soil sample barrel to rise through the displacement transmission shaft, and then the loading baffle applies pressure to the contaminated soil sample, and transmits the real-time pressure to the force sensor through the force transmission shaft for real-time pressure data collection. The displacement control box receives the real-time pressure data fed back by the force sensor in real time, and adjusts the pressure applied to the displacement control box according to the real-time pressure data.

[0008] The anaerobic control system is a nitrogen bottle, which is connected to the air inlet through a pressure reducing valve and a pipeline, and is used to continuously inject nitrogen into the soil sample barrel to make the soil sample barrel in an anaerobic environment;

[0009] The greenhouse gas monitoring system is connected to the gas outlet through a pipeline and is used to analyze the gas composition discharged from the gas outlet;

[0010] The data acquisition and analysis system is connected to the displacement control box and the greenhouse gas monitoring system, and is used to set the pressure value applied by the displacement control box, and at the same time receive and store the gas composition data fed back by the greenhouse gas monitoring system in real time.

[0011] Furthermore, a sealing rubber ring is installed between the force transmission shaft and the central through hole to increase the sealing between the two.

[0012] Furthermore, a gas valve and a mass flow meter are installed on the pipeline between the pressure reducing valve and the air inlet. The mass flow meter is used to adjust and display the nitrogen flow through the pipeline in real time, and the gas valve is used to manually control the flow and shutoff of gas in the pipeline. This structure can deliver nitrogen to the soil sample barrel at a stable flow rate, maintaining the stability of the anaerobic environment and facilitating the continued anaerobic degradation.

[0013] Furthermore, the greenhouse gas monitoring system is an online gas chromatograph, and the data acquisition and analysis system is a computer.

[0014] Furthermore, a plurality of air holes are distributed on the loading baffle for discharging gas generated by the contaminated soil sample.

[0015] Furthermore, the sealing cover is sealedly connected to the upper end of the soil sample barrel through a thread, and a sealing gasket is provided between the two to increase the sealing performance between the two.

[0016] The working method of the above-mentioned anaerobic degradation carbon emission simulation experimental device of easily degradable organic matter contaminated soil is as follows:

[0017] Step 1, simulated stratum depth pressure loading: put the contaminated soil sample into the soil sample barrel, set the vertical pressure value of the simulated stratum depth in the data acquisition and analysis system, and then the data acquisition and analysis system controls the displacement control box to start, so that the displacement transmission shaft drives the tray and the soil sample barrel to rise. Since the position of the loading baffle remains unchanged, the loading baffle applies vertical pressure to the contaminated soil sample as the soil sample barrel rises, and the applied real-time pressure is transmitted to the force sensor through the force transmission shaft for real-time pressure data collection. The displacement control box receives the real-time pressure data fed back by the force sensor in real time, and compares the real-time pressure value with the set vertical pressure value until the real-time pressure value reaches the set vertical pressure value. The displacement control box stops the soil sample barrel from rising and maintains this position, completing the contaminated soil sample simulated stratum depth pressure loading process;

[0018] Step 2: Creating an anaerobic environment and maintaining the vertical pressure value: Open the nitrogen cylinder and the gas valve, adjust the pressure reducing valve, and the mass flow meter displays the nitrogen flow rate flowing through the pipeline in real time. The nitrogen flow rate flowing through the pipeline is controlled and passed into the soil sample barrel at the set nitrogen flow rate, so that the air above the loading baffle is discharged from the air outlet to the greenhouse gas monitoring system. Through the continuous injection of nitrogen, an anaerobic degradation environment is created in the soil sample barrel. At this time, the contaminated soil sample begins to undergo anaerobic degradation of organic matter. In this process, carbon-containing gas is generated, causing the contaminated soil sample to expand under the action of the generated gas, thereby increasing the vertical loading pressure. At this time, the real-time pressure data fed back by the force sensor is compared with the set value. If it exceeds the set value, the displacement control box drives the soil sample barrel to descend through the displacement transmission shaft, thereby reducing the applied vertical pressure until the real-time pressure value returns to the set vertical pressure value. The movement of the soil sample barrel is stopped and maintained. Subsequently, according to the real-time monitoring of the force sensor, the position of the soil sample barrel is adjusted in real time through the displacement control box to maintain the pressure at the simulated formation depth stable.

[0019] Step 3: Data Collection: As nitrogen continuously enters the soil sample barrel from the air inlet and is discharged from the air outlet to the greenhouse gas monitoring system, the carbon-containing gas generated by anaerobic degradation in Step 2 is discharged into the greenhouse gas monitoring system along with the nitrogen. The greenhouse gas monitoring system detects the carbon-containing gas generated by the degradation of organic pollutants and determines the gas type and content of the carbon-containing gas. During the set anaerobic degradation time, the gas type and content of the carbon-containing gas are regularly detected and recorded. After the set time is reached, the nitrogen injection is stopped and the vertical pressure is unloaded. Finally, the contaminated soil sample is removed for other tests.

[0020] Step 4: Data analysis and output: The data acquisition and analysis system integrates the carbon-containing gas type and content data obtained during each monitoring, as well as the displacement of the displacement transmission shaft during the degradation time, to obtain a curve showing the carbon-containing gas type and content versus anaerobic degradation time, and a curve showing the displacement of the displacement transmission shaft versus anaerobic degradation time;

[0021] Step 5. Data acquisition for different depths and degradation times: Set multiple different simulated formation depths, pressures, and degradation times and repeat steps 1 to 4 respectively, so as to obtain curves of carbon-containing gas types and contents versus anaerobic degradation time at different simulated formation depths and degradation times, and curves of displacement of the displacement drive shaft versus anaerobic degradation time.

[0022] Compared with the existing technology, the present invention adopts a combination of an anaerobic control system, a contaminated soil system simulation system, a greenhouse gas monitoring system and a data acquisition and analysis system. The soil sample barrel in the contaminated soil system simulation system is used to hold the contaminated soil, and the displacement control box and the force sensor cooperate with each other to simulate the ground stress corresponding to different stratum depths as needed. When the contaminated soil expands due to the subsequent anaerobic degradation, the force sensor provides real-time feedback data, and the displacement control box can adjust the displacement in real time, thereby maintaining the simulated ground stress stable during the entire anaerobic degradation process, making it easier to obtain accurate data later. The anaerobic control system is used to deliver a stable flow of nitrogen to the soil sample barrel. Gas is released, thereby forming a stable anaerobic environment in the soil sample barrel; at this time, the contaminated soil continues to undergo an anaerobic degradation process of organic matter in the environment, and the carbon-containing gas produced can flow with the nitrogen to the greenhouse gas monitoring system for gas type and content detection, and each detection data is fed back to the data acquisition and analysis system, and finally a curve of the type and content of the carbon-containing gas versus the anaerobic degradation time at different simulated stratum depths and different degradation times, and a curve of the displacement of the displacement drive shaft versus the anaerobic degradation time can be obtained; because the present invention creates a stable ground stress and anaerobic environment, the data required for anaerobic degradation can be accurately obtained, which is convenient for providing data support for subsequent research on carbon emissions from contaminated soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the simulation experiment device in the present invention;

[0024] Figure 2 It is a structural schematic diagram of the sealing cover of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the loading baffle in the present invention;

[0026] Figure 4 It is a logic diagram of the interactive control of the force sensor and the displacement control box to stabilize the vertical pressure in the present invention.

[0027] In the figure: I. Anaerobic control system, II. Contaminated soil system simulation system, III. Greenhouse gas detection system, IV. Data acquisition and analysis system, 1. Nitrogen cylinder, 2. Pressure reducing valve, 3. Gas valve, 4. Mass flow meter, 5. Gas pipeline, 6. Reaction frame, 7. Force sensor, 8. Force transmission shaft, 9. Sealing rubber ring, 10. Air inlet, 11. Air outlet, 12. Sealing cover, 121. Sealing gasket, 122. Thread, 13. Soil sample barrel, 14. Loading baffle, 141. Air vent, 15. Connector, 16. Contaminated soil sample, 17. Tray, 18. Displacement transmission shaft, 19. Displacement control box, 20. Data transmission line, 21. Online gas chromatograph, 22. Computer, 23. Connecting line. DETAILED DESCRIPTION

[0028] The present invention will be further described below.

[0029] like Figure 1 As shown, a carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil includes an anaerobic control system, a contaminated soil system simulation system, a greenhouse gas monitoring system, and a data acquisition and analysis system;

[0030] The contaminated soil system simulation system includes a displacement control box 19, a reaction frame 6, a soil sample bucket 13, a loading baffle 14, a force sensor 7 and a force transmission shaft 8; the displacement control box 19 is equipped with a displacement transmission shaft 18 on the upper part, and a tray 17 is installed on the upper end of the displacement transmission shaft 18. The displacement control box 19 controls the displacement transmission shaft 18 to move up and down to drive the tray 17 to move synchronously; the reaction frame 6 is fixed to the upper part of the displacement control box 19, and the soil sample bucket 13 is fixed on the tray 17 for holding the contaminated soil sample 16; the upper end of the soil sample bucket 13 is equipped with a sealing cover 12, such as Figure 2As shown, the sealing cover 12 is sealedly connected to the upper end of the soil sample barrel 13 via a thread 122, and a sealing gasket 121 is provided between the two to increase the sealing between the two. The sealing cover 12 is provided with a central through hole, an air inlet 10, and an air outlet 11. The force sensor 7 is located above the soil sample barrel 13, and its upper end is fixedly connected to the reaction frame 6. The lower end of the force sensor 7 is fixedly connected to one end of the force transmission shaft 8. The other end of the force transmission shaft 8 extends through the central through hole into the soil sample barrel 13. The other end of the force transmission shaft 8 is fixedly connected to the loading baffle 14 via a connector 15. The force sensor 7, the force transmission shaft 8, and the displacement transmission shaft 18 are all on the axis of the soil sample barrel 13. Figure 3 As shown, the loading baffle 14 is provided with a plurality of air holes 141 for discharging the gas generated by the contaminated soil sample 16. A sealing rubber ring 9 is installed between the force transmission shaft 8 and the central through hole to increase the sealing between the two. When it is necessary to apply pressure to the contaminated soil sample 16, the displacement control box 19 drives the tray 17 and the soil sample barrel 13 to rise through the displacement transmission shaft 18, and then the loading baffle 14 applies pressure to the contaminated soil sample 16, and transmits the real-time pressure to the force sensor 7 through the force transmission shaft 8 for real-time pressure data collection. The displacement control box 19 receives the real-time pressure data fed back by the force sensor 7 through the connecting line 23 in real time, and adjusts the pressure applied to the displacement control box 19 according to the real-time pressure data;

[0031] The anaerobic control system comprises a nitrogen cylinder 1, which is connected to an air inlet 10 via a pressure reducing valve 2 and a gas pipeline 5. This cylinder is used to continuously inject nitrogen into a soil sample barrel 13, creating an anaerobic environment within the barrel. The pipeline between the pressure reducing valve 2 and the air inlet 10 is equipped with a gas valve 3 and a mass flow meter 4. The mass flow meter 4 regulates and displays the nitrogen flow through the pipeline in real time, while the gas valve 3 manually controls the flow and shutoff of the pipeline gas. This structure ensures a stable flow of nitrogen into the soil sample barrel 13, maintaining the stability of the anaerobic environment and facilitating subsequent anaerobic degradation.

[0032] The greenhouse gas monitoring system is connected to the gas outlet 11 via a pipeline and is used to analyze the gas composition discharged from the gas outlet 11;

[0033] The data acquisition and analysis system is connected to the displacement control box 19 and the greenhouse gas monitoring system via a data transmission line 20, and is used to set the pressure value applied by the displacement control box 19, and at the same time receive and store the gas composition data fed back by the greenhouse gas monitoring system in real time.

[0034] As an improvement of the present invention, the greenhouse gas monitoring system is an online gas chromatograph, and the data acquisition and analysis system is a computer. The maximum pressure bearing value of the displacement control box 19 is 50kPa, and the maximum extension distance of the displacement transmission shaft 18 is 10mm.

[0035] The working method of the above-mentioned anaerobic degradation carbon emission simulation experimental device of easily degradable organic matter contaminated soil is as follows:

[0036] Step 1, simulated stratum depth pressure loading: the contaminated soil sample 16 is loaded into the soil sample barrel 13, and the vertical pressure value of the simulated stratum depth is set in the data acquisition and analysis system. Then the data acquisition and analysis system controls the displacement control box 19 to start, so that the displacement transmission shaft 18 drives the tray 17 and the soil sample barrel 13 to rise. Since the position of the loading baffle 14 remains unchanged, as the soil sample barrel 13 rises, the loading baffle 14 applies vertical pressure to the contaminated soil sample 16, and the applied real-time pressure is transmitted to the force sensor 7 through the force transmission shaft 8 for real-time pressure data collection. The displacement control box 19 receives the real-time pressure data fed back by the force sensor 7 in real time, and compares the real-time pressure value with the set vertical pressure value until the real-time pressure value reaches the set vertical pressure value. The displacement control box 19 stops the soil sample barrel 13 from rising and maintains this position, completing the simulated stratum depth pressure loading process of the contaminated soil sample 16;

[0037] Step 2, creating an anaerobic environment and maintaining the vertical pressure value: open the nitrogen bottle 1 and the gas valve 3, adjust the pressure reducing valve 2, and the mass flow meter 4 displays the nitrogen flow rate flowing through the pipeline in real time, and controls the nitrogen flow rate flowing through the pipeline. The set nitrogen flow rate is passed into the soil sample barrel 13, so that the air above the loading baffle 14 is discharged from the air outlet 11 to the greenhouse gas monitoring system. Through the continuous injection of nitrogen (nitrogen continuously enters the soil sample barrel 13 from the air inlet 10 and is discharged from the air outlet 11. This dynamic flow mode has two functions. First, the continuous injection of nitrogen can keep the soil sample barrel 13 in a stable anaerobic environment at all times. Second, the flowing nitrogen can carry the carbon-containing gas produced by anaerobic degradation and transport it to the greenhouse gas monitoring system for gas type and content detection and analysis), an anaerobic degradation environment is created in the soil sample barrel. At this time, the contaminated soil sample 16 begins to undergo anaerobic degradation of organic matter. In this process, carbon-containing gas will be produced, causing the contaminated soil sample 16 to expand under the action of the produced gas, thereby increasing the vertical loading pressure. Figure 4 As shown, at this time, the real-time pressure data fed back by the force sensor 7 is compared with the set value. If it exceeds the set value, the displacement control box 19 drives the soil sample bucket to descend through the displacement transmission shaft 18, thereby reducing the applied vertical pressure until the real-time pressure value returns to the set vertical pressure value, and the movement of the soil sample bucket 13 is stopped and maintained. Subsequently, according to the real-time monitoring of the force sensor 7, the position of the soil sample bucket 13 is adjusted in real time through the displacement control box 19 to keep the pressure at the simulated formation depth stable;

[0038] Step 3, data collection: As nitrogen continuously enters the soil sample barrel 13 from the air inlet and is discharged to the greenhouse gas monitoring system from the air outlet 11, the carbon-containing gas generated by the anaerobic degradation in step 2 is discharged to the greenhouse gas monitoring system along with the nitrogen. The greenhouse gas monitoring system detects the carbon-containing gas generated by the degradation of organic pollutants, determines the gas type and content of the carbon-containing gas, and regularly detects and records the gas type and content of the carbon-containing gas within the set anaerobic degradation time. After the set time is reached, the nitrogen injection is stopped and the vertical pressure is unloaded. Finally, the contaminated soil sample is removed for other tests;

[0039] Step 4: Data analysis and output: The data acquisition and analysis system integrates the carbon-containing gas type and content data obtained during each monitoring, as well as the displacement of the displacement transmission shaft during the degradation time, to obtain a curve showing the carbon-containing gas type and content versus anaerobic degradation time, and a curve showing the displacement of the displacement transmission shaft versus anaerobic degradation time;

[0040] Step 5. Data acquisition for different depths and degradation times: Set multiple different simulated formation depths, pressures, and degradation times and repeat steps 1 to 4 respectively, so as to obtain curves of carbon-containing gas types and contents versus anaerobic degradation time at different simulated formation depths and degradation times, and curves of displacement of the displacement drive shaft versus anaerobic degradation time.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A simulation experimental device for anaerobic degradation of carbon emissions from easily degradable organic matter-contaminated soil, characterized in that: Including anaerobic control system, contaminated soil system simulation system, greenhouse gas monitoring system and data acquisition and analysis system; The contaminated soil system simulation system includes a displacement control box, a reaction frame, a soil sample barrel, a loading baffle, a force sensor and a force transmission shaft; the displacement control box is provided with a displacement transmission shaft on the upper part, and a tray is provided on the upper end of the displacement transmission shaft, and the displacement control box controls the displacement transmission shaft to move up and down to drive the tray to move synchronously; the reaction frame is fixed on the upper part of the displacement control box, and the soil sample barrel is fixed on the tray for holding the contaminated soil sample; the upper end of the soil sample barrel is provided with a sealing cover, and a central through hole, an air inlet and an air outlet are provided on the sealing cover, the force sensor is located above the soil sample barrel, and its upper end is fixedly connected to the reaction frame, and the lower end of the force sensor is fixedly connected to one end of the force transmission shaft. Then, the other end of the force transmission shaft passes through the central through hole and extends into the soil sample barrel. The other end of the force transmission shaft is fixedly connected to the loading baffle through a connector, and the force sensor, the force transmission shaft and the displacement transmission shaft are all on the axis of the soil sample barrel. When it is necessary to apply pressure to the contaminated soil sample, the displacement control box drives the tray and the soil sample barrel to rise through the displacement transmission shaft, and then the loading baffle applies pressure to the contaminated soil sample, and transmits the real-time pressure to the force sensor through the force transmission shaft for real-time pressure data collection. The displacement control box receives the real-time pressure data fed back by the force sensor in real time, and adjusts the pressure applied to the displacement control box according to the real-time pressure data. The anaerobic control system is a nitrogen bottle, which is connected to the air inlet through a pressure reducing valve and a pipeline, and is used to continuously inject nitrogen into the soil sample barrel to make the soil sample barrel in an anaerobic environment; The greenhouse gas monitoring system is connected to the gas outlet through a pipeline and is used to analyze the gas composition discharged from the gas outlet; The data acquisition and analysis system is connected to the displacement control box and the greenhouse gas monitoring system, and is used to set the pressure value applied by the displacement control box, and at the same time receive and store the gas composition data fed back by the greenhouse gas monitoring system in real time.

2. The carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to claim 1 is characterized in that: A sealing rubber ring is installed between the force transmission shaft and the central through hole to increase the sealing performance between the two.

3. The carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to claim 1 is characterized in that: A gas valve and a mass flow meter are installed on the pipeline between the pressure reducing valve and the air inlet. The mass flow meter is used to adjust and display the nitrogen flow flowing through the pipeline in real time, and the gas valve is used to manually control the circulation and closing of the pipeline gas.

4. The carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to claim 1 is characterized in that: The greenhouse gas monitoring system is an online gas chromatograph, and the data acquisition and analysis system is a computer.

5. The carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to claim 1 is characterized in that: The loading baffle is provided with a plurality of air holes for discharging gas generated by the contaminated soil sample.

6. The carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to claim 1 is characterized in that: The sealing cover is sealed and connected to the upper end of the soil sample barrel through a thread, and a sealing gasket is provided between the two to increase the sealing performance between the two.

7. A method for operating the carbon emission simulation experimental device for anaerobic degradation of easily degradable organic matter contaminated soil according to any one of claims 1 to 6, characterized in that: The specific steps are: Step 1, simulated stratum depth pressure loading: put the contaminated soil sample into the soil sample barrel, set the vertical pressure value of the simulated stratum depth in the data acquisition and analysis system, and then the data acquisition and analysis system controls the displacement control box to start, so that the displacement transmission shaft drives the tray and the soil sample barrel to rise. Since the position of the loading baffle remains unchanged, the loading baffle applies vertical pressure to the contaminated soil sample as the soil sample barrel rises, and the applied real-time pressure is transmitted to the force sensor through the force transmission shaft for real-time pressure data collection. The displacement control box receives the real-time pressure data fed back by the force sensor in real time, and compares the real-time pressure value with the set vertical pressure value until the real-time pressure value reaches the set vertical pressure value. The displacement control box stops the soil sample barrel from rising and maintains this position, completing the contaminated soil sample simulated stratum depth pressure loading process; Step 2: Creating an anaerobic environment and maintaining the vertical pressure value: Open the nitrogen cylinder and the gas valve, adjust the pressure reducing valve, and the mass flow meter displays the nitrogen flow rate flowing through the pipeline in real time. The nitrogen flow rate flowing through the pipeline is controlled so that the set nitrogen flow rate is passed into the soil sample barrel, so that the air above the loading baffle is discharged from the air outlet to the greenhouse gas monitoring system. Through the continuous injection of nitrogen, an anaerobic degradation environment is created in the soil sample barrel. At this time, the contaminated soil sample begins to undergo anaerobic degradation of organic matter. In this process, carbon-containing gas is generated, causing the contaminated soil sample to expand under the action of the generated gas, thereby increasing the vertical loading pressure. At this time, the real-time pressure data fed back by the force sensor is compared with the set value. If it exceeds the set value, the displacement control box drives the soil sample barrel to descend through the displacement transmission shaft, thereby reducing the applied vertical pressure until the real-time pressure value returns to the set vertical pressure value. The movement of the soil sample barrel is stopped and maintained. Subsequently, according to the real-time monitoring of the force sensor, the position of the soil sample barrel is adjusted in real time through the displacement control box to maintain the pressure at the simulated formation depth stable. Step 3: Data Collection: As nitrogen continuously enters the soil sample barrel from the air inlet and is discharged from the air outlet to the greenhouse gas monitoring system, the carbon-containing gas generated by anaerobic degradation in Step 2 is discharged into the greenhouse gas monitoring system along with the nitrogen. The greenhouse gas monitoring system detects the carbon-containing gas generated by the degradation of organic pollutants and determines the gas type and content of the carbon-containing gas. During the set anaerobic degradation time, the gas type and content of the carbon-containing gas are regularly detected and recorded. After the set time is reached, the nitrogen injection is stopped and the vertical pressure is unloaded. Finally, the contaminated soil sample is removed for other tests. Step 4: Data analysis and output: The data acquisition and analysis system integrates the carbon-containing gas type and content data obtained during each monitoring, as well as the displacement of the displacement transmission shaft during the degradation time, to obtain a curve showing the carbon-containing gas type and content versus anaerobic degradation time, and a curve showing the displacement of the displacement transmission shaft versus anaerobic degradation time; Step 5. Data acquisition for different depths and degradation times: Set multiple different simulated formation depths, pressures, and degradation times and repeat steps 1 to 4 respectively, so as to obtain curves of carbon-containing gas types and contents versus anaerobic degradation time at different simulated formation depths and degradation times, and curves of displacement of the displacement drive shaft versus anaerobic degradation time.

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