Intelligent sampling device and sampling method for non-aeration liquid surface gas in sewage treatment plant

Abstract

The invention discloses a sewage treatment plant non-aeration liquid level gas intelligent sampling device and a sampling method.The sewage treatment plant non-aeration liquid level gas intelligent sampling device comprises a gas collecting hood, a buoyancy device, a sucking pump, a sampling box and a propeller, and an opening of the gas collecting hood faces downwards; a sampling connector, an exhaust valve, a signal sensor and a pressure sensor are arranged on the top face of the gas collecting hood, the buoyancy device is arranged outside the gas collecting hood, the sucking pump and the sampling box are both arranged on the top face of the gas collecting hood, and a sampling bag is arranged in the sampling box. Sampling pipes are connected between the sampling connector and the sampling bag as well as between the sucking pump and the sampling box, control valves are arranged on the sampling pipes, the propeller is arranged at the bottom of the gas collecting hood, and an engine, a storage battery and a steering device which are connected with the propeller as well as a control unit for controlling overall operation are arranged in the gas collecting hood. The invention aims to provide the sampling device and the sampling method which ensure that the collected water surface gas sample is stable and accurate and can be used for monitoring in a complex water area.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring equipment, and particularly to an intelligent sampling device and sampling method for non-aerated liquid surface gas in a sewage treatment plant. Background Art

[0002] With the development of human activities and the industrialization process, climate change caused by the increase in greenhouse gases has become one of the greatest threats faced by humanity. There is an urgent need for new technical means to scientifically, effectively, and accurately collect greenhouse gases emitted by sewage treatment plants, so as to fully understand and master the actual carbon emission situation of sewage treatment plants and provide reliable data support for future carbon emission reduction work. Currently, the gas collection technology for non-aerated water bodies mainly focuses on the structure of the device. For example, improving the portability of the device and its stability on the water surface. Some monitoring devices based on fixed sites have limited installation locations, making it difficult to comprehensively monitor large areas of water bodies. Moreover, in complex water surface environments, such as areas with large water surface fluctuations, the stability and accuracy of the devices are easily affected. In addition, existing sampling devices do not have clear sampling methods, and there are deficiencies in accurately collecting and calculating gas concentrations. Therefore, there is an urgent need for a sampling device and sampling method that can ensure stable and accurate collection of water surface gas samples, are easy to operate, and can monitor in complex water areas. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and aims to provide an intelligent sampling device and sampling method for non-aerated liquid surface gas in a sewage treatment plant that can ensure stable and accurate collection of water surface gas samples, are easy to operate, and can monitor in complex water areas.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0005] An intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant includes a gas collection hood, a buoyancy device, an air pump, a sampling box, and a propeller. The opening of the gas collection hood faces downward, and a sampling joint, an exhaust valve, a signal sensor, and a pressure sensor are arranged on the top surface of the gas collection hood. The buoyancy device is arranged outside the gas collection hood, and both the air pump and the sampling box are arranged on the top surface of the gas collection hood. A sampling bag is arranged in the sampling box, and sampling tubes are connected between the sampling joint and the sampling bag, and between the air pump and the sampling box, and control valves are provided on the sampling tubes. The propeller is arranged at the bottom of the gas collection hood, and an engine, a storage battery, and a steering device connected to the propeller, as well as a control unit for controlling the overall operation, are arranged inside the gas collection hood.

[0006] Further, fixing hooks are arranged at the edge of the gas collection hood, and a towing rope is tied to the fixing hooks.

[0007] Further, a signal sensor, a switch, an indicator light, and a charging port are arranged on the gas collection hood, and the charging port is electrically connected to the storage battery.

[0008] Further, the buoyancy device is an inflatable floating ring surrounding the gas collection hood.

[0009] Further, there are at least four sampling bags in the sampling box. The pipe section of the sampling pipe entering the sampling box has branches with the same number as the sampling bags, and valves are provided on each branch pipe section.

[0010] It also includes a method for sampling gas from the non-aerated liquid surface of a sewage treatment plant, and the steps are as follows:

[0011] (1) Count the waters where gas samples need to be collected, plan appropriate sampling points at the beginning of the influent, the end of the influent, the center of the water body, and the edge of the water body according to the water flow direction, and number them one by one;

[0012] (2) Start the propeller, run the sampling device to the designated point according to the number sequence and stop, make the device float at the sampling point, and the control unit outputs an instruction to open the exhaust valve;

[0013] (3) Monitor the change of the pressure sensor. When the pressure in the gas collection hood does not change with time, close the exhaust valve, and then gas collection can be carried out;

[0014] (4) Preset multiple equally spaced time intervals for segmented sampling. Open the two control valves on the sampling pipe, open the valves on the first sampling bag in the sampling box and the branch pipe section of the sampling pipe and the air extraction pump, close the valves and the air extraction pump after 30 s, complete the gas sample collection work at 0 min. After the same time interval, repeat the above steps respectively. After completing all the gas sample collection work at this point, open the exhaust valve;

[0015] (5) Move to the next sampling point and repeat steps (3) and (4) until all sampling points are completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The structure of the present invention is simple, easy to disassemble and replace parts. It has a high degree of automation and can set the sampling program according to the specific situation of the collected water body in combination with the control unit to ensure the accuracy of sampling. It can not only sample autonomously on the water surface, but also be manually controlled, greatly saving human resources while maintaining the sampling accuracy. Thus, it can select appropriate methods to collect gas samples in a variety of water body environments, making up for the defect that there is a lack of actual measurement sampling devices in this field. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is Figure 1 a top view of

[0020] Figure 3 This is a distribution diagram of sampling bags in the sampling box of the present invention.

[0021] Reference numerals:

[0022] 1-Gas collecting hood, 2-Buoyancy device, 3-Fixed hook, 4-Sampling connector, 5-Exhaust valve, 6-Sampling box, 7-Suction pump, 8-Sampling tube, 9-Sampling bag, 10-Control valve, 11-Propeller, 12-Signal sensor, 13-Pressure sensor, 14-Charging port, 15-Switch, 16-Indicator light. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] like Figures 1 to 3 As shown, the intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant includes an air collecting hood 1, a buoyancy device 2, an air pump 7, a sampling box 6 and a propeller 11. The opening of the air collecting hood 1 faces downward, and the top surface of the air collecting hood 1 is provided with a sampling connector 4, an exhaust valve 5, a signal sensor 12 and a pressure sensor 13. The buoyancy device 2 is arranged on the outside of the air collecting hood 1, and the air pump 7 and the sampling box 6 are both arranged on the top surface of the air collecting hood 1. A sampling bag 9 is arranged in the sampling box 6, and a sampling tube 8 is connected between the sampling connector 4 and the sampling bag 9 and between the air pump 7 and the sampling box 6, and the sampling tube 8 has a control valve 10. The propeller 11 is arranged at the bottom of the air collecting hood 1, and the air collecting hood 1 is provided with an engine, a battery and a steering device connected to the propeller 11, as well as a control unit for controlling the overall operation.

[0025] The edge of the gas collecting hood 1 is provided with a fixing hook 3 , and a traction rope is tied to the fixing hook 3 . The fixing hook 3 and the traction rope are used to drag the gas collecting hood 1 during manual adjustment.

[0026] The gas collecting hood 1 is provided with a signal sensor 12, a switch 15, an indicator light 16 and a charging port 14, and the charging port 14 is electrically connected to the battery. When the gas sample is collected automatically, the switch 15 is turned on to power on the device, and the control unit automatically detects whether each component is normal. When normal, the indicator light 16 is green. If there is a fault, the indicator light 16 flashes red, and the signal sensor 12 reports the fault information. The next step can be entered after the fault is eliminated. After confirming that it is normal, the water area where gas samples need to be collected is counted, and appropriate sampling points are planned at the water inlet start, water inlet end, water body center and water body edge according to the direction of water flow, and numbered one by one. After the sampling points are verified to be correct, the sampling device is programmed. After the setting is successful, the control unit outputs a command to start the propeller 11 of the power unit, and the sampling device is run to the designated point in the order of the number and then stopped, so that the device floats at the sampling point and prepares for subsequent testing.

[0027] Among them, the buoyancy device 2 is an inflatable floating ring surrounding the gas collection hood 1. The buoyancy device 2 ensures that the sampling device can stably float above the liquid surface, so that a part of the gas collection hood 1 is located below the liquid surface, and the part of the gas collection hood 1 above the buoyancy device 2 is located above the liquid surface.

[0028] As Figure 3 shown, there are at least four sampling bags 9 in the sampling box 6. The pipe section of the sampling pipe 8 entering the sampling box 6 has branches with the same number as the sampling bags 9, and valves are provided on each branch pipe section. The sampling pipe 8 has multiple branches at the same time, and can ventilate different sampling bags 9 respectively while the sampling pipe 8 remains in a connected state, avoiding multiple disassembly and connection steps in the case where the sampling pipe 8 can only be connected to a single sampling bag 9. This not only facilitates the collection of gas samples, but also avoids the mixing of air into the sampling bag 9 during disassembly.

[0029] In this embodiment, the static chamber method is adopted. The static chamber method means that the gas collection hood 1 is placed on the determined sampling water surface, the sampling time is started to be recorded, and the change of the pressure sensor 13 is monitored. When the pressure in the static chamber does not change with time, it is considered that the gas passing through the gas-liquid interface has reached dynamic equilibrium. At this time, it is considered that the diffusion and dissolution of the gas from the water surface into the water phase have reached equilibrium, and the time required for the whole process is recorded as the equilibrium time. Among them, the steering device is a Desheng servo motor, and the control unit is a Siemens S7-200PLC. The specific sampling steps are as follows:

[0030] (1) Count the waters where gas samples need to be collected, plan appropriate sampling points at the water inlet start end, water inlet end, the center of the water body, and the edge of the water body according to the water flow direction, and number them one by one.

[0031] (2) Start the propeller 11, run the sampling device to the designated point in the order of the numbers and then stop, make the device float at the sampling point, and the control unit outputs an instruction to open the exhaust valve 5.

[0032] (3) Monitor the change of the pressure sensor 13. When the pressure in the gas collection hood 1 does not change with time, at this time, the pressure inside the gas collection hood 1 is balanced with the outside air pressure, and the gas at the collection point can fully enter the gas collection hood 1. Close the exhaust valve 5, and then gas collection can be carried out.

[0033] (4) Preset sampling at 0 min, 10 min, 20 min, and 30 min. Open the two control valves 10 on the sampling pipe 8, open the valve on the branch pipe section of the first sampling bag 9 in the sampling box 6 and the sampling pump 7, and evacuate the sampling box 6 through the sampling pump 7 to form a negative pressure, so that the gas in the gas collection hood 1 is sucked into the first sampling bag 9 along the sampling pipe 8. After 30 s, close the valve and the sampling pump 7 to complete the gas sample collection work at 0 min.

[0034] After 10 minutes, the second sampling bag 9 in the sampling box 6 and the valve and the vacuum pump 7 on the branch pipe section of the sampling tube 8 are opened. After 30 seconds, the valve and the vacuum pump 7 are closed to complete the 10-minute gas sample collection work.

[0035] After 20 minutes, the third sampling bag 9 in the sampling box 6 and the valve and the vacuum pump 7 on the branch pipe section of the sampling tube 8 are opened. After 30 seconds, the valve and the vacuum pump 7 are closed to complete the 20-minute gas sample collection work.

[0036] After 30 minutes, open the valve and vacuum pump 7 on the fourth sampling bag 9 in the sampling box 6 and the branch pipe section of the sampling tube 8. After 30 seconds, close the valve and vacuum pump 7 to complete the 30-minute gas sample collection work. After completing the collection of all gas samples at this point, open the exhaust valve 5.

[0037] (5) Move to the next sampling point and repeat steps (4) and (5) until all sampling points are completed.

[0038] In this example, 4 sampling points are set in the anoxic tank and 3 sampling points are set in the anaerobic tank. The specific data are shown in the table below. Since the detected N2O concentration is equivalent to the ambient value, it can be considered that there is no N2O emission in the anaerobic unit and the anoxic unit of the water plant. From the table, we can see that the R 2 >0.9, indicating that the sampling method can ensure the accuracy, validity and scientificity of the data.

[0039]

[0040]

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Intelligent gas sampling device for non-aerated liquid surface in sewage treatment plant, characterized in that: It includes a gas collection hood (1), a buoyancy device (2), an air extraction pump (7), a sampling box (6) and a propeller (11). The opening of the gas collection hood (1) faces downward. A sampling joint (4), an exhaust valve (5), a signal sensor (12) and a pressure sensor (13) are arranged on the top surface of the gas collection hood (1). The buoyancy device (2) is arranged outside the gas collection hood (1). The air extraction pump (7) and the sampling box (6) are both arranged on the top surface of the gas collection hood (1). A sampling bag (9) is arranged in the sampling box (6). Sampling tubes (8) are connected between the sampling joint (4) and the sampling bag (9), and between the air extraction pump (7) and the sampling box (6), and control valves (10) are provided on the sampling tubes (8). The propeller (11) is arranged at the bottom of the gas collection hood (1). An engine, a storage battery and a steering device for connecting the propeller (11), and a control unit for controlling the overall operation are arranged in the gas collection hood (1).

2. The intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant according to claim 1, wherein: Fixed hooks (3) are arranged at the edge of the gas collection hood (1), and towing ropes are tied to the fixed hooks (3).

3. The intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant according to claim 1, wherein: A signal sensor (12), a switch (15), an indicator light (16) and a charging port (14) are arranged on the gas collection hood (1). The charging port (14) is electrically connected to the storage battery.

4. The intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant according to claim 1, characterized in that: The buoyancy device (2) is an inflatable floating ring surrounding the gas collection hood (1).

5. The intelligent sampling device for non-aerated liquid surface gas in a sewage treatment plant according to claim 1, wherein: There are at least four sampling bags (9) in the sampling box (6). The pipe section of the sampling tube (8) entering the sampling box (6) has branches with the same number as the sampling bags (9), and valves are provided on each branch pipe section.

6. Method for sampling gas on the non-aerated liquid surface of a sewage treatment plant, based on the intelligent gas sampling device for the non-aerated liquid surface of a sewage treatment plant according to any one of claims 1-4, characterized in that: The steps are as follows: (1) Count the waters where gas samples need to be collected, plan appropriate sampling points at the water inlet start end, water inlet end, water body center and water body edge according to the water flow direction, and number them one by one; (2) Start the propeller (11), run the sampling device to the designated point in the order of the numbers and then stop, make the device float at the sampling point, and the control unit outputs an instruction to open the exhaust valve (5); (3) Monitor the change of the pressure sensor (13). When the pressure in the gas collection hood (1) does not change with time, close the exhaust valve (5), and then gas collection can be carried out; (4) Preset multiple equally spaced time intervals for segmented sampling. Open the two control valves (10) on the sampling tube (8), open the valves on the first sampling bag (9) in the sampling box (6) and the branch pipe section of the sampling tube (8) and the air extraction pump (7), close the valves and the air extraction pump (7) after 30 s, complete the gas sample collection work at 0 min. Repeat the above steps at the same time interval respectively. After completing all the gas sample collection work at this point, open the exhaust valve (5); (5) Move to the next sampling point and repeat steps (3) and (4) until all the sampling points are completed.

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