Device for detecting organic carbon in wetland water body

Abstract

The utility model discloses a device for detecting organic carbon in a wetland water body, which belongs to the technical field of wetland water body detection and comprises a device body consisting of a control unit at the upper end, a detection unit in the middle and a support unit at the bottom, the detection unit comprises a sampling module, a pretreatment module and a detection module which are arranged in the protection box, the sampling module comprises a sampling pipe cabin, a sampling pipe and a sample collection box, the sampling pipe and the sample collection box are arranged in the sampling pipe cabin, the pretreatment module comprises a multi-stage pretreatment assembly, and the detection module comprises a catalytic oxidation chamber and a detection chamber. According to the utility model, the multi-section telescopic sampling pipe is matched with the bevel gear transmission mechanism driven by the motor, so that deeper vertical sampling can be realized; through multi-stage treatment of the cyclone separator, the ultrasonic microfiltration element and the ultrafiltration element, suspended solids, colloids and macromolecular impurities in a water sample are effectively removed, the purity of the water sample is improved, and a reliable sample is provided for subsequent detection.

Description

Technical Field

[0001] This utility model relates to the field of wetland water body detection, and in particular to a device for detecting organic carbon in wetland water bodies. Background Technology

[0002] Wetlands play a vital role in global ecosystems, and the organic carbon content in their waters is a crucial indicator of wetland ecological health and carbon sequestration capacity. Existing methods and devices for detecting organic carbon in wetland waters have several shortcomings. Traditional laboratory methods require collecting large quantities of water samples for complex chemical analysis, which is not only time-consuming and labor-intensive but also susceptible to changes in sample preservation and transportation, affecting the accuracy of the results. While some on-site testing equipment can achieve rapid detection to a certain extent, it also faces many problems in practical application. For example, traditional testing devices often use single-section sampling tubes or flexible hoses, which, limited by device height, make it difficult to achieve precise stratified sampling in deep water areas. Secondly, wetland water samples often contain complex impurities such as sediment, algae, and colloids. Existing pretreatment devices are mostly single-stage filters, and incomplete impurity removal makes subsequent testing modules susceptible to contamination, affecting the accuracy of subsequent tests. Therefore, there is an urgent need to design a wetland water organic carbon detection device that can solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a device for detecting organic carbon in wetland water bodies, in order to solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides a device for detecting organic carbon in wetland water bodies, comprising a device body, which consists of an upper control unit, a middle detection unit, and a bottom support unit. The detection unit includes a sampling module, a pretreatment module, and a detection module disposed inside a protective box. The sampling module includes a sampling tube compartment and a sampling tube and a sample collection box disposed within the sampling tube compartment. The sampling tube is configured as a multi-segment sampling tube. The pretreatment module includes a pretreatment box and a multi-stage pretreatment assembly disposed within the pretreatment box. The detection module includes a detection box and a catalytic oxidation chamber and a detection chamber disposed within the detection box. The sample collection box, the pretreatment box, and the detection box are connected sequentially via pipes.

[0005] Preferably, the control unit includes a control box, which is disposed at the upper end of the protective box, and a controller is embedded in the top of the control box.

[0006] Preferably, the protective box is configured with an inner aluminum alloy frame and an outer PEEK shell structure, and a through hole is provided at the center of the bottom of the protective box, and a retractable sealing sleeve is provided in the through hole;

[0007] The outermost surface of the protective box is coated with a hydrophobic nano-coating. The sampling tube chamber, the pretreatment box, and the detection box are all fixed inside the protective box by a support frame and bolts. The sampling tube chamber is located at the upper end of the protective box, and the pretreatment box and the detection box are located at the lower end of the protective box and are symmetrically arranged on both sides of the through hole.

[0008] Preferably, the sampling tube compartment is provided with a support plate inside, and the sample collection box is fixed on the support plate; the sampling tube includes a first sampling tube and a second sampling tube, and the top of the first sampling tube is rotatably connected to the water inlet of the sample collection box through a rotary joint.

[0009] Preferably, a keyway is provided on the upper outer side of the first sampling tube, and the first sampling tube is connected to the inner hole of the first bevel gear through the keyway. The first bevel gear meshes with the second bevel gear externally, and a transmission rod is rotatably connected to the inner hole of the second bevel gear. One end of the transmission rod is connected to the drive shaft of the motor through a coupling.

[0010] Preferably, the lower end of the first sampling tube is provided with a first connecting block, the inner wall of the first connecting block is provided with an internal thread, and a sealing and locking groove is provided on the first connecting block inside the first sampling tube. The sealing and locking groove is an annular groove. The outer wall of the second sampling tube is provided with an external thread. A locking ring is fixed at the upper end of the second sampling tube. The locking ring is provided with a protrusion that matches the sealing and locking groove. The upper end of the second sampling tube is rotatably connected to the inside of the first sampling tube, and the lower end of the second sampling tube is connected to the sampling head.

[0011] Preferably, the pretreatment component includes a hydrocyclone separator, an ultrasonic microfiltration element, and an ultrafiltration element. The hydrocyclone separator is configured with a conical structure, and a sediment collection tank is provided at the bottom of the hydrocyclone separator. The inlet of the hydrocyclone separator is connected to the outlet of the sample collection box.

[0012] The ultrasonic microfiltration element includes an ultrasonic microfiltration housing and a ceramic microfiltration membrane installed inside the ultrasonic microfiltration housing. An ultrasonic generator is installed on the outside of the ultrasonic microfiltration housing, and the inlet of the ultrasonic microfiltration housing is connected to the outlet of the hydrocyclone separator.

[0013] The ultrafiltration element includes an ultrafiltration housing and a hollow fiber membrane bundle installed inside the ultrafiltration housing.

[0014] Preferably, a quartz glass reaction tube is provided in the catalytic oxidation chamber, a heating wire is wound around the outside of the quartz glass reaction tube, and a catalyst packing layer is filled inside the quartz glass reaction tube; a spiral condenser tube is connected to the outlet of the quartz glass reaction tube, a dehumidifier is connected to the outlet of the spiral condenser tube, and the outlet of the dehumidifier is connected to the inlet of the detection chamber; a non-dispersive infrared sensor and an ultraviolet-visible spectrometer are installed inside the detection chamber.

[0015] Preferably, the support unit includes an anti-sinking plate, with a circular opening at the center of the anti-sinking plate and a conical baffle connected to the lower end of the circular opening.

[0016] Therefore, the organic carbon detection device for wetland water bodies using the above-described structure of this utility model has the following beneficial effects:

[0017] (1) The multi-stage dynamic pretreatment module effectively removes suspended solids, colloids and macromolecular impurities from water samples through multi-stage treatment by hydrocyclone separator, ultrasonic microfiltration element and ultrafiltration element, which improves the purity of water samples and provides reliable samples for subsequent detection. The combination of catalytic oxidation chamber and detection chamber in the detection module can efficiently oxidize and accurately detect organic carbon in water samples. The dual-mode detection of non-dispersive infrared sensor and ultraviolet-visible spectrometer improves the accuracy and reliability of detection.

[0018] (2) Through the multi-segment retractable sampling tube and the bevel gear transmission mechanism driven by the motor, deeper vertical sampling can be achieved. Through the cooperation of the rotary joint between the sampling box, the sealing and locking groove between the sampling tubes and the protrusion on the locking ring, it is ensured that there is no leakage when the sampling tube is extended and retracted, thus ensuring the normal progress of the sampling process.

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram showing the connection between the first sampling tube and the sample collection box in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram showing the connection between the first sampling tube and the second sampling tube in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the pretreatment box according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the detection box according to an embodiment of the present utility model;

[0026] Figure label:

[0027] 1. Device body; 2. Through hole; 3. Sampling tube compartment; 4. Pretreatment box; 5. Detection box; 6. Sample collection box; 7. First sampling tube; 8. Second sampling tube; 9. First bevel gear; 10. Second bevel gear; 11. Motor; 12. First connecting block; 13. Sealing locking groove; 14. Locking ring; 15. Sampling head; 16. Cyclone separator; 17. Ultrasonic microfiltration element; 18. Ultrafiltration element; 19. Controller; 20. Catalytic oxidation chamber; 21. Detection chamber; 22. Dehumidifier; 23. Spiral condenser tube; 24. Anti-sinking plate. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Example

[0031] like Figures 1-6As shown, this utility model provides a device for detecting organic carbon in wetland water, including a device body 1 with a longitudinally layered cylindrical structure. The device body 1 consists of a control unit at the top, a detection unit in the middle, and a support unit at the bottom. The detection unit includes a sampling module, a pretreatment module, and a detection module located inside a protective box. The protective box is configured with an inner aluminum alloy frame and an outer PEEK shell structure. The inner aluminum alloy frame is made of high-strength 6061 aluminum alloy and is formed into a stable frame structure through welding to support and protect the internal components. The outer PEEK shell of the protective box is coated with a hydrophobic nano-coating, giving the protective box excellent corrosion resistance and mechanical strength. A through hole 2 is provided at the center of the bottom of the protective box. A retractable sealing sleeve is provided inside the through hole 2. The retractable sealing sleeve is made of silicone and fits tightly against the inner wall of the through hole 2 through an elastic rubber ring. It can adaptively expand and contract according to the diameter of the sampling tube to ensure a sealing effect.

[0032] The sampling tube compartment 3, pretreatment box 4, and testing box 5 are all fixed inside the protective box by support frames and bolts. The sampling tube compartment 3 is located at the upper end of the protective box, while the pretreatment box 4 and testing box 5 are located at the lower end of the protective box and are symmetrically arranged on both sides of the through hole 2. The pretreatment box 4 and testing box 5 are both made of stainless steel and have been treated with anti-corrosion coating. Multiple partitions can be installed inside the box to arrange the internal components in a reasonable manner. At the same time, cable holes are provided on the partitions to facilitate the wiring connection between the components.

[0033] The sampling module includes a sampling tube compartment 3 and sampling tubes and a sample collection box 6 disposed within the sampling tube compartment 3. An opening for the sampling tubes to pass through is located at the center of the bottom of the sampling tube compartment 3. The sampling tubes are multi-segmented. A support plate is installed inside the sampling tube compartment 3, and the sample collection box 6 is fixed on the support plate for temporary storage of collected water samples, providing a stable water sample source for subsequent pretreatment and testing. Multiple liquid level sensors can be installed inside the sample collection box 6 to detect the amount of liquid inside. The sampling tubes include a first sampling tube 7 and a second sampling tube 8. The top of the first sampling tube 7 is rotatably connected to the inlet of the sample collection box via a rotary joint. In this embodiment, the rotary joint uses a high-precision bearing, allowing for 360-degree free rotation to ensure a stable connection of the sampling tubes during rotation.

[0034] The upper end of the first sampling tube 7 is provided with a keyway. The first sampling tube 7 is connected to the inner hole of the first bevel gear 9 through the keyway. The keyway and the key in the inner hole of the first bevel gear 9 are engaged to realize torque transmission. The first bevel gear 9 is externally meshed with the second bevel gear 10. The inner hole of the second bevel gear 10 is rotatably connected to a transmission rod. One end of the transmission rod is connected to the drive shaft of the motor 11 through a coupling. The motor 11 drives the transmission rod, and the coaxial extension and retraction of the multi-segment tube is realized through gear transmission. The motor 11 is mounted on the bulkhead through a motor mount.

[0035] A first connecting block 12 is provided at the lower end of the first sampling tube 7. The inner wall of the first connecting block 12 is provided with internal threads. A sealing and locking groove 13 is provided on the first connecting block 12 inside the first sampling tube 7. The sealing and locking groove 13 is a ring groove. The outer wall of the second sampling tube 8 is provided with external threads, which are adapted to the internal threads of the inner wall of the first connecting block 12 to achieve quick screw connection. A locking ring 14 is fixed at the upper end of the second sampling tube 8. The locking ring 14 is provided with a protrusion adapted to the sealing and locking groove. The sealing and locking groove 13 engages with the protrusion on the locking ring 14 of the second sampling tube 8 to form a rigid connection and prevent disengagement during sampling. The upper end of the second sampling tube 8 is rotatably connected to the inside of the first sampling tube 7. The lower end of the second sampling tube 8 is connected to the sampling head 15. The sampling head 15 is flared and has multiple filter holes on its surface for preliminary filtration of large particulate impurities in the water. In this embodiment, a depth detector can be provided at the connection between the second sampling tube 8 and the sampling head 15 to monitor the depth.

[0036] The multi-segment sampling tube design can be combined according to different sampling depth requirements. The first sampling tube 7 is driven to rotate by the motor 11, which drives the second sampling tube 8 and the sampling head 15 to rotate, so as to collect water samples from different directions. The filter holes of the sampling head 15 can initially filter large particulate impurities to prevent clogging of the sampling tube and subsequent processing equipment.

[0037] The pretreatment module includes a pretreatment tank 4 and a multi-stage pretreatment assembly housed within the pretreatment tank 4. The pretreatment assembly includes a hydrocyclone separator 16, an ultrasonic microfiltration element 17, and an ultrafiltration element 18. The hydrocyclone separator 16 has a conical structure, with its inlet tangentially connected to the outlet of the sample collection tank 6. Centrifugal force is used to throw suspended solids larger than 20 μm against the wall. A sediment collection tank is located at the bottom of the hydrocyclone separator 16 to collect suspended solids with a removal rate ≥95%, preventing clogging of subsequent membrane modules. The inlet of the hydrocyclone separator 16 is connected to the outlet of the sample collection tank 6, and a tangential inlet pipe is provided at the inlet of the hydrocyclone separator 16, creating a high-speed rotating flow field within the separator to achieve solid-liquid separation.

[0038] The ultrasonic microfiltration element 17 includes an ultrasonic microfiltration housing and a 5μm ceramic microfiltration membrane installed inside the ultrasonic microfiltration housing. An ultrasonic generator with a frequency of 40kHz is installed on the outside of the ultrasonic microfiltration housing to generate ultrasonic waves, enhance the filtration effect of the microfiltration membrane, and prevent membrane fouling. This setup is a conventional configuration in the art. In other embodiments, a surrounding piezoelectric ceramic transducer with a frequency of 28kHz and a power of 50W can also be installed outside the 5μm ceramic microfiltration membrane assembly inside the ultrasonic microfiltration housing. This transducer is activated every 10 minutes for 30 seconds to remove colloidal particles, such as algae fragments, adsorbed on the membrane surface, thereby reducing the membrane flux attenuation rate. The inlet of the ultrasonic microfiltration housing is connected to the outlet of the hydrocyclone 16 to receive the liquid after preliminary filtration.

[0039] The ultrafiltration element 18 includes an ultrafiltration housing and a hollow fiber membrane bundle installed inside the housing. The hollow fiber membrane bundle consists of 1000 hollow fiber membranes, each with an inner diameter of 0.2 mm and an outer diameter of 0.3 mm. Pressure gauges are installed at both the inlet and outlet of the ultrafiltration element 18 to monitor pressure changes during the filtration process; this setup is also conventional in this field. In this embodiment, a 100 mL cleaning solution tank is provided, containing a pH 4.0 oxalic acid / 9.5 sodium hydroxide buffer solution. When the transmembrane pressure difference exceeds 0.1 MPa, the buffer solution is automatically injected for backwashing to remove large molecular organic matter (such as humic acid), ensuring that the turbidity of the pretreated water sample is <5 NTU. This setup also follows conventional methods in this field.

[0040] In the aforementioned pretreatment components, the hydrocyclone separator 16 utilizes centrifugal force to separate solid particles such as sediments from the water sample and collect them in a sediment collection tank, reducing the burden on subsequent filtration equipment and improving pretreatment efficiency. The ceramic microfiltration membrane in the ultrasonic microfiltration element 17 filters out tiny particles and colloidal substances from the water sample, while the ultrasonic waves generated by the ultrasonic generator effectively prevent membrane fouling, maintain the permeability of the microfiltration membrane, and ensure filtration effectiveness. The hollow fiber membrane bundle of the ultrafiltration element 18 further filters out large molecular organic matter and microorganisms from the water sample, ensuring the water sample reaches the required purity for testing.

[0041] The detection module includes a detection chamber 5 and a catalytic oxidation chamber 20 and a detection chamber 21 located inside the detection chamber 5. The catalytic oxidation chamber 20 contains a quartz glass reaction tube, which is 50 cm long, has an inner diameter of 10 mm, and a wall thickness of 2 mm. A heating wire made of nickel-chromium alloy is wound around the outside of the quartz glass reaction tube at a winding density of 5 turns / cm. The heating temperature is controlled by a temperature controller, with a temperature range of 300-600℃. The quartz glass reaction tube is filled with a catalyst packing layer; this catalyst packing layer is filled with platinum-rhodium catalyst with a particle diameter of 0.5-1 mm, used for the catalytic oxidation of organic carbon in the water sample. This setup is also a standard configuration in this field. Under the action of high temperature and catalyst, the organic carbon in the water sample can be oxidized and decomposed into carbon dioxide, providing measurable substances for subsequent detection.

[0042] The outlet of the quartz glass reaction tube is connected to a spiral condenser 23 via a pipe to condense the high-temperature gas generated after catalytic oxidation, converting water vapor into liquid water for subsequent dehumidification. In other embodiments, a cooling water jacket can be installed outside the spiral condenser 23 to condense the gas after reaction using circulating cooling water. The outlet of the spiral condenser 23 is connected to a dehumidifier 22 to remove moisture from the condensed gas, preventing moisture from interfering with the detection equipment and ensuring the accuracy of the detection data. A gas distribution plate can be installed inside the dehumidifier 22, with silica gel desiccant placed on the gas distribution plate to ensure uniform gas flow and improve dehumidification efficiency. The outlet of the dehumidifier 22 is connected to the inlet of the detection chamber 21, which houses a non-dispersive infrared sensor and an ultraviolet-visible spectrometer. The dispersive infrared sensor and ultraviolet-visible spectrometer are mounted on a detection platform inside the detection chamber 21. In some embodiments, the detection platform can be fixed with shock-absorbing rubber pads to reduce the impact of external vibrations on the detection equipment. A non-dispersive infrared sensor is used to detect the concentration of carbon dioxide generated after catalytic oxidation, and an ultraviolet-visible spectrometer is used to analyze the composition and content of organic carbon in water samples. The above settings also adopt the conventional settings in this field.

[0043] The locations where liquid transfer or sampling is required between the aforementioned components are all equipped with control valves, pipes, etc., in accordance with conventional methods in the art. The control unit includes a control box, which is located at the top of the protective box. A controller 19 is embedded in the top of the control box. In this embodiment, a central processing unit, a wireless communication module, and a lithium battery can also be integrated inside the control box. The central processing unit is responsible for receiving data transmitted from the sampling module, preprocessing module, and detection module, performing data processing and analysis, and controlling the operation of components such as the motor 11, heating wire, and ultrasonic generator according to a preset program to ensure the automation and accuracy of the detection process. The central processing unit is connected to the controller 19, which is equipped with a touch screen to control the various components. The wireless communication module enables data transmission between the device and a remote monitoring platform. Staff can view the detection data and equipment operating status in real time through a mobile APP or computer, and remotely control the start / stop and parameter settings of the device. The lithium battery is located inside the control box to provide stable power to the device. All the above components are arranged in a conventional manner in the art.

[0044] The support unit includes an anti-sinking plate 24, which is welded to the bottom of the protective box or connected to the bottom of the protective box via multiple aluminum alloy pillars to provide buoyancy. Alternatively, a main support plate can be installed at the bottom of the protective box, and the anti-sinking plate 24 can be installed at the lower end of the main support plate. A circular opening is provided at the center of the anti-sinking plate 24, and a conical baffle is connected to the lower end of the circular opening. A guide plate is provided on the baffle to prevent the opening from being filled with weeds, making it difficult to retract the sampling tube.

[0045] When the above-mentioned device is used for sampling, it is first placed at the predetermined detection position in the wetland. Then, the control unit starts the motor 11. The motor 11 drives the second bevel gear 10 to rotate via the transmission rod. The second bevel gear 10 meshes with the first bevel gear 9, causing the first sampling tube 7 to rotate, which in turn drives the second sampling tube 8 and the sampling head 15 to rotate. According to the preset sampling depth and orientation, the combined length and rotation angle of the first sampling tube 7 and the second sampling tube 8 are adjusted. The water sample enters the sampling tube through the filter hole of the sampling head 15 and then flows into the sample collection box 6 for collection. When the water sample in the sample collection box 6 reaches the preset liquid level, the control unit controls the motor 11 to stop running, completing the sampling process.

[0046] The water sample in sample collection tank 6 flows into hydrocyclone separator 16 through a pipe. Inside hydrocyclone separator 16, the water sample rotates at high speed, and solid particles such as sediment are separated under centrifugal force and fall into the sediment collection tank at the bottom. The water sample after hydrocyclone separation flows out from the outlet of hydrocyclone separator 16 and enters ultrasonic microfiltration element 17. In ultrasonic microfiltration element 17, the ceramic microfiltration membrane filters out small particles and colloidal substances, while the ultrasonic waves generated by the ultrasonic generator continuously vibrate the microfiltration membrane to prevent clogging of the membrane surface. The water sample after ultrasonic microfiltration then enters ultrafiltration element 18, where hollow fiber membrane bundles further filter out large molecular organic matter and microorganisms, resulting in a pure water sample to be tested.

[0047] The pretreated water sample enters the quartz glass reaction tube in the catalytic oxidation chamber 20. Under the heating of a heating wire and the action of a platinum-rhodium catalyst, the organic carbon in the water sample is oxidized and decomposed into carbon dioxide. The generated carbon dioxide gas is cooled by a spiral condenser 23, condensing the water vapor into liquid water, which is then removed by a dehumidifier 22. The dried carbon dioxide gas enters the detection chamber 21, where a non-dispersive infrared sensor detects the concentration of carbon dioxide. Based on the stoichiometric relationship between carbon dioxide and organic carbon, the content of organic carbon in the wetland water is calculated. Simultaneously, an ultraviolet-visible spectrometer performs spectral analysis on the water sample to obtain the composition and structural information of the organic carbon. The detection results are processed and stored by the control unit and transmitted in real time to a remote monitoring platform via a wireless communication module.

[0048] Therefore, the present invention provides a wetland water organic carbon detection device with the above-mentioned structure. Through a multi-segment retractable sampling tube and a motor-driven bevel gear transmission mechanism, it can achieve deeper vertical sampling. Through multi-stage treatment by a hydrocyclone separator, an ultrasonic microfiltration element, and an ultrafiltration element, it effectively removes suspended solids, colloids, and macromolecular impurities from the water sample, improves the purity of the water sample, and provides a reliable sample for subsequent testing.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A device for detecting organic carbon in wetland water, characterized in that: The device includes a main body, which consists of a control unit at the top, a detection unit in the middle, and a support unit at the bottom. The detection unit includes a sampling module, a pretreatment module, and a detection module located inside a protective enclosure. The sampling module includes a sampling tube compartment and a sampling tube and a sample collection box located inside the sampling tube compartment. The sampling tube is configured as a multi-segment sampling tube. The pretreatment module includes a pretreatment box and a multi-stage pretreatment assembly located inside the pretreatment box. The detection module includes a detection box and a catalytic oxidation chamber and a detection chamber located inside the detection box. The sample collection box, the pretreatment box, and the detection box are connected sequentially by pipes.

2. The device for detecting organic carbon in wetland water as described in claim 1, characterized in that: The control unit includes a control box, which is located at the top of the protective box, and a controller is embedded in the top of the control box.

3. The device for detecting organic carbon in wetland water as described in claim 1, characterized in that: The protective box is configured with an inner aluminum alloy frame and an outer PEEK shell structure. A through hole is provided at the center of the bottom of the protective box, and a retractable sealing sleeve is provided in the through hole. The outermost surface of the protective box is coated with a hydrophobic nano-coating. The sampling tube chamber, the pretreatment box, and the detection box are all fixed inside the protective box by a support frame and bolts. The sampling tube chamber is located at the upper end of the protective box, and the pretreatment box and the detection box are located at the lower end of the protective box and are symmetrically arranged on both sides of the through hole.

4. The device for detecting organic carbon in wetland water as described in claim 1, characterized in that: The sampling tube compartment is equipped with a support plate inside, and the sample collection box is fixed on the support plate; the sampling tube includes a first sampling tube and a second sampling tube, and the top of the first sampling tube is rotatably connected to the water inlet of the sample collection box through a rotary joint.

5. The device for detecting organic carbon in wetland water bodies according to claim 4, characterized in that: The upper end of the first sampling tube is provided with a keyway. The first sampling tube is connected to the inner hole of the first bevel gear through the keyway. The first bevel gear meshes with the second bevel gear. The inner hole of the second bevel gear is rotatably connected to a transmission rod. One end of the transmission rod is connected to the drive shaft of the motor through a coupling.

6. The device for detecting organic carbon in wetland water bodies according to claim 5, characterized in that: The lower end of the first sampling tube is provided with a first connecting block, the inner wall of the first connecting block is provided with an internal thread, and a sealing and locking groove is provided on the first connecting block inside the first sampling tube. The sealing and locking groove is a ring groove. The outer wall of the second sampling tube is provided with an external thread. A locking ring is fixed at the upper end of the second sampling tube. The locking ring is provided with a protrusion that matches the sealing and locking groove. The upper end of the second sampling tube is rotatably connected to the inside of the first sampling tube, and the lower end of the second sampling tube is connected to the sampling head.

7. The device for detecting organic carbon in wetland water bodies according to claim 1, characterized in that: The pretreatment assembly includes a hydrocyclone separator, an ultrasonic microfiltration element, and an ultrafiltration element. The hydrocyclone separator is configured with a conical structure, and a sediment collection tank is provided at the bottom of the hydrocyclone separator. The inlet of the hydrocyclone separator is connected to the outlet of the sample collection tank. The ultrasonic microfiltration element includes an ultrasonic microfiltration housing and a ceramic microfiltration membrane installed inside the ultrasonic microfiltration housing. An ultrasonic generator is installed on the outside of the ultrasonic microfiltration housing, and the inlet of the ultrasonic microfiltration housing is connected to the outlet of the hydrocyclone separator. The ultrafiltration element includes an ultrafiltration housing and a hollow fiber membrane bundle installed inside the ultrafiltration housing.

8. The device for detecting organic carbon in wetland water as described in claim 1, characterized in that: The catalytic oxidation chamber is equipped with a quartz glass reaction tube, the outside of which is wound with a heating wire, and the inside of which is filled with a catalyst packing layer. The outlet of the quartz glass reaction tube is connected to a spiral condenser, the outlet of which is connected to a dehumidifier, and the outlet of the dehumidifier is connected to the inlet of the detection chamber. The inside of the detection chamber is equipped with a non-dispersive infrared sensor and an ultraviolet-visible spectrometer.

9. The device for detecting organic carbon in wetland water as described in claim 1, characterized in that: The support unit includes an anti-sinking plate, with a circular opening at the center of the anti-sinking plate and a conical groove connected to the lower end of the circular opening.

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