Device and method for collecting greenhouse gas released by unit in sewage treatment

Abstract

The invention discloses a device for collecting greenhouse gas released by a unit in sewage treatment, which comprises a floating module, a detection module and a connection module, and the detection module is mounted on the floating module through the connection module. The detection module comprises a gas-collecting hood, a limiting plate arranged at an inlet of the gas-collecting hood, an aeration unit gas-collecting cavity and a non-aeration unit gas-collecting cavity, the aeration unit gas-collecting cavity and the non-aeration unit gas-collecting cavity are arranged in the gas-collecting hood, a gas detection unit is arranged at the top of the gas-collecting hood, and the aeration unit gas-collecting cavity and the non-aeration unit gas-collecting cavity are both connected with the gas detection unit. The floating module comprises a floating block with a hole, the connecting module comprises a bottom box and a top box, the gas collecting hood is inserted into the top box, the bottom box is inserted into the floating block with the hole, the top box is inserted into the bottom box, and the floating block with the hole, the top box, the bottom box and the gas collecting hood are fixed into a whole through bolts. The aeration unit and the non-aeration unit can be measured by using the same device, so that the complexity and manual operation steps of using a plurality of devices are reduced. The working efficiency is greatly improved, and the field working time is shortened.

Description

Technical Field

[0001] The present invention belongs to the field of gas collection equipment, and in particular relates to a device and method for collecting greenhouse gases released by a unit in sewage treatment. Background Art

[0002] The main greenhouse gases include carbon dioxide, methane, nitrous oxide and various fluorinated gases. Although these gases have different concentrations in the atmosphere, they all have a significant impact on global warming. Through global agreements such as the Paris Agreement, the international community is committed to reducing greenhouse gas emissions to meet the challenges of climate change.

[0003] As global climate change intensifies, the monitoring and management of greenhouse gases has become one of the key tasks for various industries. During the sewage treatment process, a large amount of greenhouse gases, especially methane, nitrous oxide and carbon dioxide, are produced due to various biological and chemical reactions. The emission of these gases not only affects the atmosphere, but also has a profound negative effect on the surrounding environment and ecosystem. Therefore, real-time and accurate monitoring of greenhouse gas emissions from sewage treatment facilities has important environmental and economic significance.

[0004] Since 2000, domestic and foreign research has been conducted on greenhouse gas emissions from different sewage treatment units, different biological treatment processes and technologies. For example, the Chinese patent with the announcement number CN116990089B discloses a monitoring device and method for direct greenhouse gas emissions from sewage, which uses a closed box to cover the sewage liquid surface to meet the needs of long-term monitoring of greenhouse gas emissions from sewage liquid surfaces under different environments. However, it only measures the non-aerated sewage liquid surface. Nitrous oxide and carbon dioxide in greenhouse gases are both produced in large quantities at the aerated liquid surface, so it is not suitable to use the above device and method to collect greenhouse gases.

[0005] Another example is the Chinese patent application with publication number CN102353563A, which discloses a device and method for collecting greenhouse gases released by a sewage aerobic treatment unit. An air bag is used to collect greenhouse gases produced by the aerobic treatment unit. However, it is only for aerobic treatment units and cannot monitor non-aerated treatment units.

[0006] At present, my country has not yet formulated standard collection devices and sampling methods for greenhouse gases released from aerobic sewage treatment units. This defect has led to obvious deficiencies in my country's acquisition of greenhouse gas emission data from sewage treatment plants and the formulation of emission reduction strategies. Since greenhouse gases such as methane and nitrous oxide released in aerobic treatment units have an important impact on climate change, it is particularly important to research and develop accurate and portable collection devices and sampling methods. This can not only fill the technical gap, but also provide reliable data support for emission reduction strategies and environmental protection policies. Summary of the invention

[0007] The purpose of the present invention is to provide a device for collecting greenhouse gases released by units in sewage treatment, so as to solve the problem that non-aerated units and aerated units use different equipment for collection, which has high labor intensity, low efficiency and high cost.

[0008] In order to solve the above problems, the present invention discloses a device for collecting greenhouse gases released by a unit in sewage treatment, comprising:

[0009] A floating module, a detection module and a connection module, wherein the detection module is installed on the floating module through the connection module, the detection module includes an air collecting hood, a limit plate arranged at the inlet of the air collecting hood, an aeration unit air collecting cavity and a non-aeration unit air collecting cavity arranged in the air collecting hood, a gas detection unit is arranged on the top of the air collecting hood, and the aeration unit air collecting cavity and the non-aeration unit air collecting cavity are both connected to the gas detection unit.

[0010] As a further improvement of the above technical solution:

[0011] The floating module includes a floating block with holes, the connecting module includes a bottom box and a top box, the air collecting hood is inserted into the top box, the bottom box is inserted into the floating block with holes, the top box is inserted into the bottom box, and the floating block with holes, the top box, the bottom box and the air collecting hood are fixed together by bolts.

[0012] The cavity formed by the inner wall of the gas collecting hood is a non-aeration unit gas collecting cavity, and the gas detection unit is directly connected to the non-aeration unit gas collecting cavity.

[0013] An air bag is arranged in the air collecting hood, the inner cavity of the air bag is the air collecting cavity of the aeration unit, and the top of the air bag is connected to the gas detection unit through a pipeline.

[0014] The limiting plate includes a main frame and a sub-frame, and the main frame and the sub-frame are connected with a driving structure to realize their rotation around the axis. An air inlet is arranged in the middle of the main frame, and the inlet end of the airbag bag is fixed to the outside of the air inlet. The sub-frame is arranged below the air inlet to seal the air inlet.

[0015] The gas detection unit includes a temperature detection system, a pressure detection system and a gas concentration detection system.

[0016] The gas detection unit also includes a gas pressure correction system.

[0017] The floating module also includes a driving propeller, and the position and running speed of the floating module can be changed by adjusting the rotation speed and angle of the driving propeller.

[0018] An air pump is arranged on the air collecting hood, and the air pump is connected to the air collecting cavity of the non-aeration unit.

[0019] The present invention also discloses a method for collecting greenhouse gases released by a unit in sewage treatment, and a device for collecting greenhouse gases released by a unit in sewage treatment, comprising the following steps:

[0020] Place a greenhouse gas collection device for the wastewater treatment unit in the pool, and select a collection mode, which includes: an aeration unit gas collection mode and a non-aeration unit collection mode;

[0021] When the non-aeration unit gas collection mode is running, it includes:

[0022] The limit plate is opened by the driving structure, and the limit plate rotates as a whole into the air collecting cover to squeeze the air bag so that the gas cannot enter the air bag;

[0023] Start the air pump until the air pressure calibration system detects that the pressure inside and outside the air hood is the same, and the air pump automatically shuts down;

[0024] The gas enters the gas collecting cavity of the non-aeration unit and is detected and analyzed by the gas concentration detection system;

[0025] When the aeration unit gas collection mode is running, it includes:

[0026] The sub-plate frame is opened by the driving structure, and the sub-plate frame rotates in a direction away from the air collecting cover, and the air inlet is opened to allow gas to enter the airbag bag;

[0027] When the pressure inside the airbag reaches equilibrium with the external pressure, the gas concentration detection system performs detection and analysis.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Integrated design improves efficiency: The device is suitable for measuring aerated and non-aerated units, reducing the complexity of using multiple devices and manual operation steps, and improving work efficiency.

[0030] Reduce costs: One device completes two measurement tasks, reducing the cost of purchasing and maintaining multiple devices, and also reducing maintenance costs.

[0031] Space saving: It reduces the number of equipment that needs to be installed on site, saves space, and is particularly suitable for sewage treatment plants with limited equipment or complex environments.

[0032] Differential pressure correction function: effectively eliminate or reduce measurement errors caused by changes in ambient pressure and improve data accuracy.

[0033] Limiting plate design: prevents the gas collecting hood from collecting gas in advance on the way to the water surface, ensuring the accuracy of the measurement data.

[0034] Real-time monitoring: The automatic monitoring device can monitor the concentration changes of greenhouse gases in real time, realize 24-hour uninterrupted monitoring, and cover the gas emissions in the entire sewage treatment process.

[0035] Data continuity: Automatic monitoring devices can form complete time series data, which is convenient for trend analysis and prediction.

[0036] Reduce labor costs: Automated devices greatly reduce the costs of manual sampling, transportation and analysis.

[0037] Portability and ease of operation: The equipment has a simple structure, is easy to carry, has easy parts to replace, and is easy to operate.

[0038] Wide applicability: It can be widely used in the collection of greenhouse gases released by aerobic treatment units in various sewage treatment processes, and accurately quantify the diffusion flux of various greenhouse gases per unit area of ​​the environmental surface.

[0039] Improve measurement accuracy: Through the floating module and the driving propeller, the sampling position can be adjusted as needed to obtain gas samples in different areas, thereby improving the accuracy of the measurement data.

[0040] In summary, the present invention has significant advantages in improving work efficiency, reducing costs, and improving data accuracy, and provides accurate and reliable data support for environmental monitoring and emission analysis, and is particularly suitable for complex and changeable field environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0043] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0044] Figure 4 This is a schematic diagram of the working mode of the non-aeration unit gas collection mode of the present invention;

[0045] Figure 5 This is a schematic diagram of the working of the gas collection mode of the aeration unit of the present invention.

[0046] Figure numerals: 101, gas collecting hood; 102, limiting plate; 103, airbag bag; 2, gas detection unit; 301, floating block with holes; 41, bottom box; 42, top box; 1021, main frame; 1022, sub-frame. DETAILED DESCRIPTION

[0047] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0048] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] like Figures 1 to 5 As shown, the greenhouse gas collection device for a sewage treatment unit in this embodiment includes:

[0052] A floating module, a detection module and a connecting module. The detection module is installed on the floating module through the connecting module. The detection module includes an air collecting hood 101, a limiting plate 102 arranged at the inlet of the air collecting hood 101, an aeration unit air collecting cavity and a non-aeration unit air collecting cavity arranged in the air collecting hood 101. The shape of the air collecting hood 101 can be a prismatic structure, a cylindrical structure or other structures. In this embodiment, the air collecting hood 101 is a square frame made of acrylic material.

[0053] A gas detection unit 2 is provided on the top of the gas collecting hood 101, and both the gas collecting cavity of the aeration unit and the gas collecting cavity of the non-aeration unit are connected to the gas detection unit 2. The gas detection unit 2 includes a temperature detection system, an air pressure correction system, a pressure detection system, and a gas concentration detection system. An air pump is provided on the gas collecting hood, and the air pump is connected to the air collecting cavity of the non-aeration unit. The air pump is used in the air pressure correction system to reduce the pressure difference between the inside and outside of the gas collecting hood.

[0054] The cavity formed by the inner wall of the gas collecting hood 101 is a non-aeration unit gas collecting cavity, and the gas detection unit 2 is directly connected to the non-aeration unit gas collecting cavity. An air bag 103 is arranged in the gas collecting hood 101, and the cavity inside the air bag 103 is an aeration unit gas collecting cavity. The top of the air bag 103 is connected to the gas detection unit through a pipeline. The air bag 103 is a square bottom air bag made of polyethylene material, with one end open at the bottom for gas collection, and one end sealed at the top and connected to the silicone tube through a hot pressing process and connected to the gas detection unit 2.

[0055] The floating module includes a floating block 301 with holes. The optional materials of the floating block 301 with holes include wooden boards, foam boards, life buoys, butyl tires, etc. This embodiment uses thick foam boards, which have the advantages of being easy to carry and easy to obtain. The foam boards in the experiment are partially hollowed out to maintain balance.

[0056] The connection module includes a bottom box 41 and a top box 42, the air hood 101 is inserted into the top box 42, the bottom box 41 is inserted into the perforated floating block 301, the top box 42 is inserted into the bottom box 41, and the perforated floating block 301, the top box 42, the bottom box 41 and the air hood 101 are fixed together by bolts.

[0057] The limit plate 102 includes a main frame 1021 and a sub-frame 1022. The main frame 1021 and the sub-frame 1022 are connected with a driving structure to realize their rotation around the axis. An air inlet is set in the middle of the main frame 1021. The inlet end of the airbag bag 103 is fixed to the outside of the air inlet. The sub-frame 1022 is set below the air inlet to seal the air inlet. The limit plate 102 is remotely controlled by an intelligent switch. It is in a closed state before being put in, and is remotely opened after contacting the water surface. This can greatly reduce the error caused by the early entry of greenhouse gases to the test.

[0058] The floating module also includes a driving propeller. By adjusting the speed and angle of the driving propeller, the position and running speed of the floating module can be changed. Since the data taken by traditional fixed sampling has errors, resulting in low accuracy, the driving propeller is used to adjust the position of the floating module to obtain gases in different areas and improve the accuracy of the measurement. The floating module is equipped with GPS (model: Ublox ZED-F9P) + IMU (LSM9DS1), which can accurately obtain the position and adjust the angle and speed of the driving propeller through the control module. The traditional method relies on manual placement of equipment at fixed sampling points and completes sampling point by point, which is inefficient. Sampling of large-area sewage pools requires frequent movement of equipment, resulting in long task execution time. Greenhouse gas emissions are affected by environmental factors such as water temperature, air pressure, and flow rate, and these parameters usually change significantly within a day. If the sampling time span is too long (such as several hours or even a day), the emission rates at different time points may be inconsistent and cannot reflect the dynamic changes of real-time emissions. Short sampling execution time can capture the instantaneous characteristics of emissions more quickly and improve the time consistency of data. Greenhouse gas emissions have spatiotemporal dynamic characteristics, forming local concentration gradients on the water surface in a short period of time, and the spatial distribution of gas concentrations is usually uneven. On the water surface, some areas may release a large amount of gas, while other areas are lower. In actual measurements, single-point sampling may not reflect the overall emission level, resulting in insufficient data representativeness. Sampling completed in a short time can cover different areas of the water surface more quickly, capture the spatiotemporal characteristics of local concentration distribution, and reduce the average deviation. In the same task, the data of different sampling points have large time differences (such as data collected in the morning and afternoon), and the time change of emission rate may cause deviations in the integrated data. This deviation is particularly obvious in short-term high-intensity emission scenarios. Quick completion of sampling tasks can complete the collection of all data within a relatively stable time window, ensuring time consistency during data analysis. There may be safety hazards such as slipping and falling at the edge of the sewage pool or in open waters. Operators may be exposed to sewage or toxic and harmful gases, increasing health risks. The main safety hazards in traditional sampling methods are solved by avoiding contact with high-risk environments, improving operation stability, reducing physical labor risks, reducing nighttime operation hazards, and responding to abnormal conditions.

[0059] Compared with the traditional static box sampling method, the equipment and method involved in the present invention have the following main advantages: the same device can be used to measure aerated and non-aerated units, reducing the complexity of using multiple devices and manual operation steps. Through the integrated operation process, work efficiency can be greatly improved and on-site work time can be reduced. At the same time, equipment and maintenance costs can be reduced. One device can complete two measurement tasks, reducing the cost of purchasing and maintaining multiple devices. Integrated measurement devices are usually designed to be multifunctional, so the maintenance cost is relatively low. The number of equipment that needs to be installed on site is reduced, saving space, especially in sewage treatment plants with limited equipment or complex environments.

[0060] Secondly, this device contains a differential pressure correction function, because when used in different environments, changes in external atmospheric pressure may affect the measurement results. Through the differential pressure correction function, the measurement error caused by changes in environmental pressure can be effectively eliminated or reduced, thereby improving the accuracy of the data. The pressure difference in different measurement environments may cause changes in the air flow velocity and gas flow inside the instrument, affecting the response of the sensor. Through differential pressure correction, the consistency of the measurement results can be maintained, making the data in different environments comparable.

[0061] At the same time, the device is equipped with a stop plate to prevent the gas hood from collecting gas prematurely on the way to the water surface. If the gas is collected prematurely before the detector is fully ready, it may cause uncalibrated or unstable gas samples to enter the device, which will greatly affect the measurement data. The stop plate can prevent premature gas collection and ensure that sampling only starts when the device is in a stable and calibrated state, thereby improving the accuracy of the measurement.

[0062] The automatic monitoring device used in this device gets rid of the inconvenience of timed testing and sampling. The fully automatic device can monitor the concentration changes of greenhouse gases (such as CO2, CH4, N2O) in real time to ensure timely acquisition of accurate data on gas emissions in sewage treatment. It can also conduct 24-hour uninterrupted monitoring around the clock, covering the gas emissions in the entire sewage treatment process, and can record long-term emission trends. Since real-time monitoring can be achieved, the data is continuous and can form a complete time series, which is convenient for trend analysis and prediction. The device can store large quantities of data and provide comprehensive data analysis and reports. Air bag collection requires repeated manual sampling, transportation and analysis. The process is cumbersome and time-consuming, especially in large-scale monitoring tasks. The efficiency is low, and the automated device greatly reduces labor costs.

[0063] The device and method of the present invention have a simple structure, are easy to carry, have easy parts to replace, and are simple to operate. They can be widely used in the collection of greenhouse gases released by aerobic treatment units in various sewage treatment processes, and can accurately quantify the diffusion flux of various greenhouse gases per unit area of ​​the environmental surface.

[0064] The method for collecting greenhouse gases released by a unit in sewage treatment of this embodiment is based on a device for collecting greenhouse gases released by a unit in sewage treatment, and includes the following steps:

[0065] Place a greenhouse gas collection device for the wastewater treatment unit in the pool, and select a collection mode, which includes: an aeration unit gas collection mode and a non-aeration unit collection mode;

[0066] When the non-aeration unit gas collection mode is running, it includes:

[0067] The limiting plate 102 is opened by the driving structure, and the limiting plate 102 rotates as a whole toward the gas collecting cover 1 to squeeze the air bag 103, so that the gas cannot enter the air bag 103;

[0068] The air pump is started until the air pressure calibration system detects that the pressure inside and outside the air collecting hood 101 is the same, and the air pump is automatically turned off;

[0069] The gas enters the gas collecting cavity of the non-aeration unit and is detected and analyzed by the gas concentration detection system;

[0070] When the aeration unit gas collection mode is running, it includes:

[0071] The auxiliary plate frame 1022 is opened by the driving structure, and the auxiliary plate frame 1022 rotates away from the air collecting cover 1, and the air inlet is opened, so that the gas enters the air bag 103;

[0072] When the pressure inside the airbag 103 reaches equilibrium with the external pressure, the gas concentration detection system performs detection and analysis.

[0073] This embodiment provides a greenhouse gas collection device released by aeration units and non-aeration units in various treatment processes of a sewage treatment plant. The greenhouse gas collection device has a simple design and is fully functional. It can test aeration and non-aeration units at the same time, and can basically meet the testing needs of the entire plant. The parts are easy to replace and easy to operate. These advantages not only improve the operability and adaptability of the equipment, but also ensure the accuracy and timeliness of the collected greenhouse gas samples, thereby providing accurate and reliable data support for environmental monitoring and emission analysis. This device is particularly suitable for various complex and changeable on-site environments, and can respond quickly to different sampling needs to ensure the efficiency and accuracy of greenhouse gas emission monitoring.

[0074] This embodiment provides an automatic moving method of a floating module, comprising:

[0075] The pool body is divided into grids, the center of the grid is defined as the initial sampling point, and the initial moving path is planned according to the initial sampling point; the grid can be circular or square.

[0076] Perform patrol sampling according to the initial moving path.

[0077] Analyze the sampling data. If the difference between the sampling data of adjacent sampling points is within the threshold, keep the current state and continue patrol sampling. If the difference between the sampling data is not within the threshold, further grid division is performed to obtain new sampling points, and a new moving path is planned according to the new sampling points. Repeat the above steps to obtain the best sampling data.

[0078] The database records the planned path according to the current time, weather and other environmental factors. The next time the sampling equipment is put into use, the moving path can be automatically selected and the moving path can be continuously updated according to the actual sampling results. By updating the database, the amount of calculation and calculation time can be reduced, and the sampling operation path can be obtained quickly and accurately.

[0079] The controller gradually navigates the floating module to the center point of the target grid according to the path sequence. GPS provides global positioning, IMU assists in position and attitude correction in a short period of time, and the propeller motor adjusts the direction and speed through differential speed. At each sampling point, the gas sensor starts to collect and store data such as greenhouse gas concentration, temperature and humidity, and records the timestamp and coordinates. When encountering an obstacle, the obstacle position is detected by lidar and the obstacle avoidance strategy is triggered. After sampling is completed, the collected data (such as gas concentration, temperature and humidity) is stored in the controller in real time, and a regional concentration distribution map is drawn. Through the wireless communication module (such as LoRa or Wi-Fi), the data is uploaded to the cloud or local storage device for real-time monitoring. If an abnormal concentration value is detected, the system marks the abnormal point and automatically arranges additional sampling.

[0080] The above is only an embodiment of the present invention, and the common sense such as the known specific structure and characteristics in the scheme is not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A device for collecting greenhouse gases released by a unit in sewage treatment, characterized in that: include: A floating module, a detection module and a connection module, wherein the detection module is mounted on the floating module via the connection module, the detection module comprising an air collecting hood (101), a limit plate (102) arranged at the inlet of the air collecting hood (101), an aeration unit air collecting cavity and a non-aeration unit air collecting cavity arranged in the air collecting hood (101), a gas detection unit (2) being arranged at the top of the air collecting hood (101), and both the aeration unit air collecting cavity and the non-aeration unit air collecting cavity being connected to the gas detection unit (2).

2. The greenhouse gas collection device for wastewater treatment unit release according to claim 1 is characterized in that: The floating module comprises a floating block with holes (301), the connecting module comprises a bottom box (41) and a top box (42), the air collecting hood (101) is inserted into the top box (42), the bottom box (41) is inserted into the floating block with holes (301), the top box (42) is inserted into the bottom box (41), and the floating block with holes (301), the top box (42), the bottom box (41) and the air collecting hood (101) are fixed as a whole by bolts.

3. The greenhouse gas collection device for wastewater treatment unit release according to claim 1 or 2, characterized in that: The cavity formed by the inner wall of the gas collecting hood (101) is a non-aeration unit gas collecting cavity, and the gas detection unit (2) is directly connected to the non-aeration unit gas collecting cavity.

4. The greenhouse gas collection device for wastewater treatment unit release according to claim 3 is characterized in that: An air bag (103) is arranged in the air collecting hood (101); the inner cavity of the air bag (103) is an aeration unit air collecting cavity; and the top of the air bag (103) is connected to a gas detection unit via a pipeline.

5. The greenhouse gas collection device for wastewater treatment unit release according to claim 4 is characterized in that: The limiting plate (102) comprises a main frame (1021) and a sub-frame (1022), wherein the main frame (1021) and the sub-frame (1022) are connected with a driving structure to realize rotation around an axis, an air inlet is arranged in the middle of the main frame (1021), an inlet end of the airbag bag (103) is fixed to the outside of the air inlet, and the sub-frame (1022) is arranged below the air inlet to seal the air inlet.

6. The greenhouse gas collection device for wastewater treatment unit release according to claim 5 is characterized in that: The gas detection unit (2) comprises a temperature detection system, a pressure detection system and a gas concentration detection system.

7. The greenhouse gas collection device for wastewater treatment unit release according to claim 6 is characterized in that: The gas detection unit (2) also includes a gas pressure correction system.

8. The greenhouse gas collection device for wastewater treatment unit release according to claim 7 is characterized in that: The floating module also includes a driving propeller, and the position and running speed of the floating module can be changed by adjusting the rotation speed and angle of the driving propeller.

9. The greenhouse gas collection device for wastewater treatment unit release according to claim 8, characterized in that: An air pump is arranged on the air collecting hood, and the air pump is connected to the air collecting cavity of the non-aeration unit.

10. A method for collecting greenhouse gases released by a sewage treatment unit, based on the device for collecting greenhouse gases released by a sewage treatment unit according to claim 9, characterized in that: The following steps are involved: Place a greenhouse gas collection device for the unit released in the sewage treatment into the pool, and select a collection mode, which includes: an aeration unit gas collection mode and a non-aeration unit collection mode; When the non-aeration unit gas collection mode is running, it includes: The limiting plate (102) is opened by the driving structure, and the limiting plate (102) is rotated as a whole toward the gas collecting cover (1), thereby squeezing the air bag (103) so that the gas cannot enter the air bag (103); The air pump is started until the air pressure calibration system detects that the pressure inside and outside the air collecting hood (101) is the same, and the air pump is automatically turned off; The gas enters the gas collecting cavity of the non-aeration unit and is detected and analyzed by the gas concentration detection system; When the aeration unit gas collection mode is running, it includes: The auxiliary plate frame (1022) is opened by the driving structure, the auxiliary plate frame (1022) rotates in a direction away from the gas collecting cover (1), and the air inlet is opened, so that the gas enters the air bag (103); When the pressure inside the airbag bag (103) reaches equilibrium with the external pressure, the gas concentration detection system performs detection and analysis.

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