COD (Chemical Oxygen Demand) sampling and detecting device for wastewater treatment

Abstract

The invention relates to the technical field of COD sampling detection, in particular to a COD sampling detection device for wastewater treatment.The COD sampling detection device comprises a liquid storage tank, a frame, an air floatation tank, a treatment tank and a storage tank, a micro-bubble generator is fixedly installed on the side wall of the air floatation tank, the air floatation tank is of a two-stage structure, a pressurizing assembly is arranged on the frame, and the micro-bubble generator is fixedly installed on the side wall of the treatment tank. A plurality of groups of stirring mechanisms capable of reciprocating are arranged in the air floatation tank, an ozone oxidation assembly is arranged in the treatment tank, the treatment tank is communicated with the storage tank through an extraction device, and a heating digestion assembly is further arranged on the frame. By adopting a two-stage air floatation tank structure and combining with a stirring and slag scraping mechanism capable of reciprocating, grease, suspended solids and formed flocs in a water sample can be efficiently and thoroughly removed, the physical obstruction and chemical interference of the interfering substances on the subsequent digestion and oxidation process are effectively eliminated, the representativeness and purity of a detected sample are ensured, and the detection accuracy is improved. Therefore, the accuracy of the COD measurement result is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of COD sampling and detection, and particularly relates to a COD sampling and detection device for wastewater treatment. BACKGROUND

[0002] As a core index for measuring organic pollution of water bodies, the accuracy of the detection data of chemical oxygen demand (COD) is directly related to pollution assessment, process adjustment, tax payment and legal compliance of standard discharge. However, modern industrial wastewater is becoming unprecedentedly complex. The wastewater produced by food, pharmaceutical, printing and dyeing, petrochemical and other industries is rich in complex components such as oil, colloid, suspended particles, volatile phenol, surfactant and high-chloride salt. The organic matter wrapped by oil, the reduced matter adsorbed by particles, the interference of chloride ion on the oxidation process, and the loss of volatile matter in pretreatment……The traditional sampling and simple pretreatment method is not enough when facing these situations, resulting in serious distortion of the detection results. Therefore, the market urgently needs an innovative pretreatment device that can ensure the "truth, accuracy and completeness" of the COD detection sample from the source.

[0003] At present, the traditional COD sampling and detection device for wastewater treatment usually has the following shortcomings. First, the pretreatment method is single and broken, and the resistance to complex matrix is weak. Many devices use air aeration or stirring for homogenization, which has the risk of "secondary interference" and destroys the originality of the sample. Without pretreatment of the wastewater, the detection efficiency and accuracy cannot be improved. SUMMARY

[0004] The present application relates to the technical field of COD sampling and detection, and particularly relates to a COD sampling and detection device for wastewater treatment.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a COD sampling and detection device for wastewater treatment, comprising a liquid storage tank, a frame, an air flotation tank, a treatment tank and a storage tank, a micro-bubble generator is fixedly installed on the side wall of the air flotation tank, a drainage port is formed on the side of the air flotation tank close to the treatment tank, and an electric gate is arranged at the drainage port, the air flotation tank adopts a two-stage structure comprising a first-stage tank and a second-stage tank, a pressurizing assembly is arranged on the frame for pumping wastewater into the air flotation tank and realizing dissolved air, a plurality of reciprocally movable stirring mechanisms are arranged in the air flotation tank for mixing the wastewater and scraping off surface dregs, an ozone oxidation assembly is arranged in the treatment tank for pre-oxidizing the wastewater from the air flotation tank, the treatment tank is communicated with the storage tank through a pumping device, and a heating digestion assembly is further arranged on the frame.

[0006] Preferably, the pressurizing assembly comprises three pressurizing pumps fixedly installed on the frame, and the water suction end of one of the pressurizing pumps is in fixed communication with the liquid storage tank through a water inlet pipe for pressurizing the sewage in the liquid storage tank to send into the first-stage pool, and the water suction ends of the other two pressurizing pumps are both in communication with the air flotation pool through water suction pipes for balancing the sewage amount on both sides of the first-stage pool and the second-stage pool, the water outlet ends of the pressurizing pumps are fixedly communicated with water guide pipes, the outer wall of the water guide pipe is fixedly installed with a pressure gauge, and the water outlet end of the water guide pipe is fixedly communicated with a Venturi tube which is located in the air flotation pool.

[0007] Preferably, a gas supply pipe is fixedly installed on the frame, the gas supply pipe is externally connected with a nitrogen supply device, the contraction part of each Venturi tube is fixedly communicated with the gas supply pipe through a side suction pipe, and a one-way valve is installed in the side suction pipe.

[0008] Preferably, the stirring mechanism comprises a driving motor installed on the top of the air flotation pool through a sliding assembly, the output end of the driving motor is fixedly connected with a stirring rod, and the side wall of the stirring rod is fixedly connected with a scraper.

[0009] Preferably, the sliding assembly comprises two sliding frames fixedly installed on the frame, the top of the two sliding frames is slidingly connected with a moving plate through a rotating wheel, and the driving motor is fixedly installed on the top of the moving plate.

[0010] Preferably, the rotating wheel is in transmission connection with the output end of the driving motor through a transmission device, and the driving motor rotates in the forward direction and the reverse direction alternately.

[0011] Preferably, the ozone oxidation assembly comprises a gas storage tank and a gas pump fixedly installed on the frame, the gas storage tank stores ozone, the gas suction end of the gas pump is in communication with the gas storage tank, the treatment pool is provided with an aeration port, the gas discharge end of the gas pump is in communication with the aeration port through a pipeline, and a flow meter is fixedly installed on the side wall of the pipeline.

[0012] Preferably, a catalytic rod is fixedly installed in the treatment pool through a mounting frame, and the catalytic rod is in a spiral structure.

[0013] Preferably, an ultraviolet lamp is fixedly installed in the treatment pool, and the outer wall of the ultraviolet lamp is provided with a transparent quartz tube.

[0014] Preferably, the heating digestion assembly comprises a heating tank fixedly installed on the frame, the water suction pipe of the extraction device is in communication with the heating tank through a sampling pipe, the side wall of the sampling pipe is fixedly communicated with a dosing device, and a detection machine is arranged on the frame.

[0015] Compared with the prior art, the present application has the following advantages: The application adopts a double-stage air floatation tank structure, and combines with a reciprocating stirring and slag scraping mechanism, so that oil, suspended matter and formed flocculation in water samples can be efficiently and thoroughly removed, physical blockage and chemical interference of these interference substances on subsequent digestion and oxidation processes are effectively eliminated, the representativeness and purity of the detection sample are ensured, and the accuracy of the COD measurement result is greatly improved. The reciprocating stirring mechanism can not only scrape off the floating slag, but also form a complex turbulent flow in the tank, break the fixed flow state, make the reagent mixing more uniform, and increase the collision probability of particles and micro-bubbles. When the stirring vortex flow and the Venturi jet flow interact, a composite vortex flow and a "bubble stagnation circulation" are formed, and the generation, dispersion and capturing capacity of micro-bubbles on pollutants (especially emulsified oil and colloids) are further enhanced, so that the pretreatment effect is better.

[0016] The pressurized dissolved gas system of the application injects inert gas such as nitrogen by using a Venturi tube, and creates an anoxic / anaerobic environment. On the one hand, the chemical oxidation of dissolved oxygen on the water in the air floatation process is avoided, and on the other hand, the activity of aerobic microorganisms is inhibited to prevent the consumption of organic matter in the water sample, so that the original concentration of the water sample COD is maintained, and the foundation for truly reflecting the wastewater pollution load is laid.

[0017] By means of the ozone oxidation assembly, the spiral catalytic rod and the ultraviolet lamp, the long-chain and refractory organic matter in the water sample is pre-oxidized by using the generated strong oxidizing hydroxyl radicals in the pretreatment stage, so that the long-chain and refractory organic matter is broken and degraded into small-molecule easy-oxidizing substances. This makes the time required for the subsequent standard digestion process greatly shortened, and the detection efficiency greatly improved.

[0018] In summary, the device integrates air floatation impurity removal, inert protection, stirring and mixing, advanced oxidation, heating digestion and other multiple functional units, and has compact structure and coherent process. Through the cooperation of the electric gate, the pressurizing pump, the driving motor, the air pump and the control valve, semi-automatic or automatic operation and control can be realized, the manual operation link and the error are reduced, and the reliability and consistency of the overall detection are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an overall axonometric structure schematic view of a COD sampling and detection device for wastewater treatment according to the application; Figure 2 It is an air floatation tank and treatment tank structure schematic view of a COD sampling and detection device for wastewater treatment according to the application; Figure 3 It is an air pump and gas storage tank structure schematic view of a COD sampling and detection device for wastewater treatment according to the application; Figure 4 It is a driving motor and stirring rod structure schematic view of a COD sampling and detection device for wastewater treatment according to the application; Figure 5 A schematic diagram of the pressurizing pump and conduit structure of the COD sampling and detection device for wastewater treatment is proposed in the present application; Figure 6 A schematic diagram of the Venturi tube and side suction pipe structure of the COD sampling and detection device for wastewater treatment is proposed in the present application; Figure 7 A schematic diagram of the extraction device and sampling pipe structure of the COD sampling and detection device for wastewater treatment is proposed in the present application.

[0020] In the figure: 1 liquid storage tank, 2 frame, 3 water inlet pipe, 4 air floatation tank, 5 treatment tank, 6 gas storage tank, 7 air pump, 8 flow meter, 9 aeration port, 10 mounting frame, 11 catalytic rod, 12 ultraviolet lamp, 13 electric gate, 14 drive motor, 15 transmission device, 16 sliding frame, 17 rotating wheel, 18 stirring rod, 19 scraper, 20 micro-bubble generator, 21 pressurizing pump, 22 pressure gauge, 23 water guide pipe, 24 water suction pipe, 25 Venturi tube, 26 side suction pipe, 27 air supply pipe, 28 extraction device, 29 heating tank, 30 sampling pipe, 31 dosing device, 32 detection machine. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0022] Reference Figures 1 to 7 A COD sampling and detection device for wastewater treatment includes a liquid storage tank 1, a frame 2, an air floatation tank 4, a treatment tank 5, and a storage tank. The air floatation tank 4 is provided with a drainage port on one side close to the treatment tank 5, and an electric gate 13 is arranged at the drainage port. A micro-bubble generator 20 is fixedly installed on the side wall of the air floatation tank 4. The air floatation tank 4 adopts a double-stage structure, including a first-stage tank and a second-stage tank. The first-stage tank is used for coarse separation to remove most of the easily floating oil, large particle suspended solids, and large floc. The second-stage tank is used for fine treatment to receive the water after the first-stage treatment, and the concentration of pollutants and the particle size of the particles have been reduced. The second-stage tank is used for fine treatment to remove the residual, finer emulsified oil, colloid, and small floc. This series connection design greatly improves the overall removal rate and prevents impurities such as oil stains from affecting the subsequent detection effect.

[0023] The frame 2 is provided with a pressurizing assembly, the pressurizing assembly comprising three pressurizing pumps 21 fixedly installed on the frame 2, one of the pressurizing pumps 21 has a water suction end fixedly communicated with the liquid storage tank 1 through the water inlet pipe 3 for pressurizing the sewage in the liquid storage tank 1 and sending the sewage into the first-stage pool, the water suction ends of the other two pressurizing pumps 21 are both communicated with the air flotation pool 4 through water suction pipes 24 for balancing the sewage amount on both sides of the first-stage pool and the second-stage pool, the water outlet ends of the pressurizing pumps 21 are fixedly communicated with water guide pipes 23, the outer walls of the water guide pipes 23 are fixedly installed with pressure gauges 22, the water outlet ends of the water guide pipes 23 are fixedly communicated with venturi tubes 25, and the venturi tubes 25 are located in the air flotation pool 4, a gas supply pipe 27 is fixedly installed on the frame 2, the gas supply pipe 27 is connected with a nitrogen gas supply device, the contraction portions of the venturi tubes 25 are fixedly communicated with the gas supply pipe 27 through side suction pipes 26, the side suction pipes 26 are installed with one-way valves, the output ends of the venturi tubes 25 extend to the bottom of the air flotation pool 4 for spraying the high-pressure sewage after dissolving gas back to the air flotation pool 4, before working, the electric gate 13 is closed, the pressurizing pump 21 connected with the water inlet pipe 3 is started, the sewage in the liquid storage tank 1 is sucked into the pressurizing pump 21 through the water inlet pipe 3, pressurized and then sent into the air flotation pool 4, the micro-bubble generator 20 is started, and micro-bubbles are formed at the bottom of the air flotation pool 4, as the sewage amount in the air flotation pool 4 increases, the other two pressurizing pumps 21 are started, so that the sewage amount on both sides of the air flotation pool 4 tends to be balanced, the outlet water of the second-stage pool is pressurized and then sprayed into the bottom of the first-stage pool through the venturi tube 25, so as to realize the re-saturation of dissolved gas: the outlet water of the second-stage pool itself contains saturated gas which is not completely released, is pressurized again and then passes through the venturi tube 25, so that the negative pressure is generated at the contraction portion, the additional inert gas is sucked, the liquid reaches the extremely high gas supersaturation state before entering the first-stage air flotation pool 4, the extremely small and uniform bubbles are generated, when the supersaturated liquid is released by decompression from the bottom of the first-stage pool, the bubbles with extremely large amount and small size and uniform distribution are formed, the bubbles have larger total surface area and stronger interface adsorption capacity, which is extremely effective for capturing small particles and emulsified oil droplets, the inert gas such as nitrogen is used, so that the chemical oxidation effect caused by oxygen (such as the oxidation of part of the reducing organic matters in advance during the air flotation process, which causes the lower COD measurement value) is avoided, and the biological activity is inhibited, the inert environment can inhibit the growth of aerobic microorganisms in the air flotation pool 4, prevents the consumption of the organic matters in the water sample, so as to maintain the originality of the COD of the water sample, during the standard digestion process, the oxidant can not effectively contact and oxidize the wrapped organic matters, which causes the lower measurement value, the inert gas protection prevents part of the reducing organic matters in the water from being oxidized in advance, which ensures that the total amount of the reducing substances of the water sample entering the COD digestion link maintains the original state when the sampling is performed.

[0024] A plurality of stirring mechanisms are arranged in the air flotation tank 4, and the stirring mechanism comprises a driving motor 14 installed on the top of the air flotation tank 4 through a sliding assembly, the output end of the driving motor 14 is fixedly connected with a stirring rod 18, the side wall of the stirring rod 18 is fixedly connected with a scraper 19, the sliding assembly comprises two sliding frames 16 fixedly installed on the frame 2, the top of the two sliding frames 16 is slidably connected with a moving plate through a rotating wheel 17, the driving motor 14 is fixedly installed on the top of the moving plate, and the rotating wheel 17 is in transmission connection with the output end of the driving motor 14 through a transmission device 15, the driving motor 14 is started, and the driving motor 14 is alternately rotated in forward rotation and reverse rotation, so as to drive the stirring rod 18 below to be intermittently rotated in forward rotation and reverse rotation, and the sewage is stirred; meanwhile, the rotating wheel 17 is driven to rotate in the sliding frame 16 through the transmission device 15, so as to drive the whole stirring rod 18 and the driving motor 14 to reciprocate on the upper end of the air flotation tank 4, the flocculation and impurities generated on the surface of the air flotation tank 4 are removed, the reciprocating stirring rod 18 can disrupt the fixed flow state, so that the water flow in the tank generates more complex turbulence, the mixture of the medicament is uniform, the mixture is more thorough, the collision probability of the particles is increased, the collision, adsorption and flocculation between the micro particles, the bubbles and the particles are promoted, the deposition of the sludge on the wall or the corner of the tank is prevented, so that all the suspended matters in the region have the opportunity to be captured by the bubbles, when the stirring rod 18 moves above the jet flow area, the vortex generated by the stirring rod 18 will interact with the turbulence of the jet flow, so as to form a composite vortex structure, the composite vortex can transmit the high momentum of the jet flow area to the downstream and the periphery, so as to significantly expand the effective mixing area, meanwhile, the micro bubbles are wrapped and broken by the jet flow to be finer, and the vortex generated by the stirring captures the micro bubbles, so as to form a "bubble retention circulation" in the tank, and the capturing capacity of the bubbles for the oil and the impurities is improved.

[0025] The frame 2 is provided with an ozone oxidation assembly, and the ozone oxidation assembly comprises a gas storage tank 6 and a gas pump 7 fixedly installed on the frame 2, the gas storage tank 6 stores ozone, the suction end of the gas pump 7 is in communication with the gas storage tank 6, the treatment tank 5 is provided with an aeration port 9, and a catalytic rod 11 and an ultraviolet lamp 12 are fixedly installed through a mounting frame 10, the exhaust end of the gas pump 7 is in communication with the aeration port 9 through a pipeline, and the side wall of the pipeline is fixedly installed with a flow meter 8, the ultraviolet lamp 12 is installed in a transparent quartz tube, and the catalytic rod 11 has a spiral structure, when the water in the air flotation tank 4 reaches a set amount, the electric gate 13 is opened, so that the sewage at the bottom of the air flotation tank 4 enters the treatment tank 5, when the water level in the air flotation tank 4 and the treatment tank 5 tends to be balanced, the ultraviolet lamp 12 and the gas pump 7 are started, the ozone in the gas storage tank 6 is sprayed out from the aeration port 9 in a set amount under the detection of the flow meter 8 through the gas pump 7, under the action of the spiral catalytic rod 11, the ozone is combined with the ultraviolet light to generate hydroxyl radicals in situ, and the sewage is pre-oxidized.

[0026] The treatment tank 5 is communicated with the storage tank through the pumping device 28, a heating digestion assembly is arranged on the frame 2, the heating digestion assembly comprises a heating tank 29 fixedly installed on the frame 2, a water suction pipe side wall of the pumping device 28 is communicated with the heating tank 29 through a sampling pipe 30, the water suction pipe side wall is provided with a control valve, a side wall of the sampling pipe 30 is fixedly communicated with a dosing device 31, a detection machine 32 (for example, a COD detector, which is prior art) is arranged on the frame 2, the dosing device 31 is used for adding potassium dichromate / sulfuric acid / silver sulfate solution into the heating tank 29, the heating tank 29 can realize temperature control, and the heating time can be adjusted; the pumping device 28 pumps the pretreated sewage back to the storage tank for next step processing; the control valve is closed to enable the sampling pipe 30 to guide a small part of the sample sewage into the heating tank 29 for appropriate heating; during the heating process, the required detection material can be added through the dosing device 31; and then the pretreated sample sewage can be guided into the detection machine 32 for final detection.

[0027] When the present application works, the electric gate 13 is closed first, the pressurizing pump 21 is started, the sewage in the liquid storage tank 1 is sucked into the pressurizing pump 21 through the water inlet pipe 3, and then is pressurized and enters the air floatation tank 4, the micro-bubble generator 20 is started to form micro-bubbles at the bottom of the air floatation tank 4, as the sewage in the air floatation tank 4 gradually increases, the other two pressurizing pumps 21 are started to gradually equalize the amount of sewage on both sides of the air floatation tank 4, the driving motor 14 is started to alternately rotate in forward rotation and reverse rotation, drives the stirring rod 18 below to intermittently rotate in forward rotation and reverse rotation, causes the stirring of the sewage, at the same time, the transmission device 15 drives the rotating wheel 17 to rotate in the sliding frame 16, thereby driving the whole stirring rod 18 and the driving motor 14 to reciprocate at the upper end of the air floatation tank 4, so as to shovel off the flocculation and impurities generated on the surface of the air floatation tank 4, the sewage with less impurities and oil at the bottom is extracted through the water suction pipe 24, is pressurized, and then enters the Venturi tube 25 through the water guide pipe 23, the pressure gauge 22 is installed on the water guide pipe 23, the pressure gauge 22 can detect the pressure of water, when the sewage is sprayed from below the Venturi tube 25, the suction force is generated in the side suction pipe 26 at the contraction of the Venturi tube 25, the one-way valve is installed in the side suction pipe 26, the inert gas in the air supply pipe 27 is sucked into the side suction pipe 26 and is mixed into the high-pressure sewage, finally, the high-pressure sewage is sprayed back to the air floatation tank 4 below together with the inert gas dissolved in the inside, when the water in the air floatation tank 4 reaches a certain amount, the electric gate 13 is opened, and the sewage at the bottom enters the treatment tank 5.

[0028] When the water level in the air floatation tank 4 and the treatment tank 5 reaches a certain level, the ultraviolet lamp 12 and the air pump 7 are started, and the ozone in the gas storage tank 6 is sprayed from the aeration port 9 in a proper amount under the detection of the flow meter 8 by the air pump 7. The catalytic rod 11 is designed in a spiral shape to increase the gas-liquid-solid contact area and the catalytic point, promote the free radical chain reaction, and the ultraviolet lamp 12 installed in the transparent quartz tube combines the ozone with the ultraviolet light to generate in-situ the hydroxyl radical with extremely strong oxidation ability, which has a higher oxidation potential than potassium dichromate, and can realize more complete oxidation. The pre-oxidized water sample is then introduced into a heating tank 29, mixed with a small amount of potassium dichromate / sulfuric acid / silver sulfate solution, and heated for a short time (for example, 150°C, 5-10 minutes), to complete the final oxidation and determination of the remaining small molecules and part of the intermediate products, so that the total digestion time is shortened from 2 hours to less than 15 minutes, greatly shortening the time required for detection.

[0029] The oxidized wastewater is pumped into the tail storage tank by the pumping device 28 for next step processing, and the pumping device 28 is connected to a sampling pipe 30, which guides a small part of the sample wastewater into the heating tank 29 for appropriate heating. During the heating process, the required detection substances can be added through the dosing device 31, and then the pretreated sample wastewater is introduced into the detection machine 32 for final detection, improving the accuracy of detection and reducing the time.

[0030] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A COD sampling and detection device for wastewater treatment, comprising a storage tank (1), a frame (2), an air flotation tank (4), a treatment tank (5), and a storage tank, characterized in that, The side wall of the flotation tank (4) is fixedly equipped with a microbubble generator (20). The flotation tank (4) has a drain outlet on the side near the treatment tank (5), and an electric gate (13) is installed at the drain outlet. The flotation tank (4) adopts a two-stage structure, including a first-stage tank and a second-stage tank. The frame (2) is equipped with a pressurizing component for pumping sewage into the flotation tank (4) and realizing dissolved air. The flotation tank (4) is equipped with multiple sets of reciprocating stirring mechanisms for mixing sewage and scraping off surface scum. The treatment tank (5) is equipped with an ozone oxidation component for pre-oxidizing sewage from the flotation tank (4). The treatment tank (5) is connected to the storage tank through an extraction device (28). The frame (2) is also equipped with a heating digestion component.

2. The COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, The pressurization assembly includes three pressurization pumps (21) fixedly installed on the frame (2), and the pumping end of one of the pressurization pumps (21) is fixedly connected to the storage tank (1) through the inlet pipe (3) to pressurize the sewage in the storage tank (1) and send it into the first stage tank. The pumping ends of the other two pressurization pumps (21) are connected to the flotation tank (4) through the suction pipe (24) to balance the sewage volume on both sides of the first stage tank and the second stage tank. The outlet end of each pressurization pump (21) is fixedly connected to the guide pipe (23). The outer wall of the guide pipe (23) is fixedly installed with a pressure gauge (22). The outlet end of the guide pipe (23) is fixedly connected to the venturi tube (25), and the venturi tube (25) is located in the flotation tank (4).

3. The COD sampling and detection device for wastewater treatment according to claim 2, characterized in that, A gas supply pipe (27) is fixedly installed on the frame (2). The gas supply pipe (27) is connected to a nitrogen supply device. The constriction of each Venturi tube (25) is fixedly connected to the gas supply pipe (27) through a side suction pipe (26). A one-way valve is installed inside the side suction pipe (26).

4. The COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, The stirring mechanism includes a drive motor (14) mounted on the top of the flotation tank (4) via a sliding assembly. The output end of the drive motor (14) is fixedly connected to a stirring rod (18), and a scraper (19) is fixedly connected to the side wall of the stirring rod (18).

5. A COD sampling and detection device for wastewater treatment according to claim 4, characterized in that, The sliding assembly includes two sliding frames (16) fixedly mounted on the frame (2). The top of the two sliding frames (16) is slidably connected to a moving plate via a rotating wheel (17). The drive motor (14) is fixedly mounted on the top of the moving plate.

6. A COD sampling and detection device for wastewater treatment according to claim 5, characterized in that, The rotating wheel (17) is connected to the output end of the drive motor (14) via a transmission device (15), and the drive motor (14) rotates alternately in forward and reverse directions.

7. A COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, The ozone oxidation assembly includes a gas storage tank (6) and a gas pump (7) fixedly installed on the frame (2). The gas storage tank (6) stores ozone. The suction end of the gas pump (7) is connected to the gas storage tank (6). An aeration port (9) is provided in the treatment pool (5). The exhaust end of the gas pump (7) is connected to the aeration port (9) through a pipe, and a flow meter (8) is fixedly installed on the side wall of the pipe.

8. A COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, A catalyst rod (11) is fixedly installed inside the treatment tank (5) by a mounting frame (10), and the catalyst rod (11) has a spiral structure.

9. A COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, An ultraviolet lamp (12) is fixedly installed inside the treatment pool (5), and a transparent quartz tube is provided on the outer wall of the ultraviolet lamp (12).

10. A COD sampling and detection device for wastewater treatment according to claim 1, characterized in that, The heating digestion assembly includes a heating tank (29) fixedly installed on the frame (2). The side wall of the pumping pipe of the extraction device (28) is connected to the heating tank (29) through a sampling pipe (30). A dosing device (31) is fixedly connected to the side wall of the sampling pipe (30). A detection machine (32) is provided on the frame (2).

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