Chemical oxygen demand monitoring device for water environment

Abstract

The invention relates to the field of water environment monitoring, and discloses a water environment chemical oxygen demand monitoring device, which comprises a temporary storage box, the temporary storage box is fixed on the top surface of a bottom plate, and the top surface of the temporary storage box is detachably provided with a sealing cover. A layered detection assembly, a lifting mechanism, a filtering mechanism, a mixing mechanism, a dismounting and mounting mechanism and a discharging mechanism are arranged on the bottom plate; the layered detection assembly comprises a conveying header pipe which is fixedly communicated with the front side of the temporary storage box, conveying branch pipes are fixedly communicated between the plurality of sampling boxes and the conveying header pipe respectively, and a chemical oxygen demand analyzer is fixed on the top surface of the bottom plate. According to the water environment monitoring device, through the arrangement of the layered detection assembly, a worker can conveniently obtain sample liquid at different depths in the water environment, so that the chemical oxygen demand distribution condition of the water environment is more comprehensively known, the monitoring accuracy and comprehensiveness are improved, and more reliable data support is provided for water environment management.

Description

Technical Field

[0001] The invention relates to the technical field of water environment monitoring, in particular to a chemical oxygen demand monitoring device for a water environment. Background Art

[0002] Water environment monitoring takes the water environment as the object, and uses physical, chemical and biological technical means to conduct qualitative, quantitative and systematic comprehensive analysis of the pollutants and their related components in it, so as to explore and study the changing patterns of water environment quality. Water environment monitoring provides reliable basic data for water environment management and provides a scientific basis for the evaluation of the effectiveness of control measures. In order for the monitoring data to accurately reflect the current quality of the water environment and predict the development trend of water environment pollution, the water environment monitoring data should be representative, accurate, precise, parallel, repeatable, complete and comparable.

[0003] According to a Chinese patent with announcement number CN213843233U, a chemical oxygen demand monitoring device for a water environment includes a water environment unit and a chemical oxygen demand analyzer, and also includes a temporary storage tank. The temporary storage tank and the water environment unit are connected by a delivery water pipe, a No. 1 solenoid valve is arranged on the delivery water pipe, a discharge water pipe is arranged at the bottom of the temporary storage tank, and a No. 2 solenoid valve is arranged on the discharge water pipe. The chemical oxygen demand analyzer is provided with an input pipe and an output pipe, the input pipe extends to the interior of the temporary storage tank, an overflow pipe is arranged at the top of the temporary storage tank, and an air pressure balance pipe is arranged vertically upward at the top of the overflow pipe.

[0004] In the above scheme, the sample liquid in the water environment is transported to a temporary storage box through a water delivery pipe and a delivery pump, and then the sample liquid in the temporary storage box is transported to a chemical oxygen demand analyzer for monitoring through a delivery pipe and a delivery pump, resulting in the following disadvantages: when the monitoring device is in use, it may not be able to effectively collect sample liquid from different depths in the water environment, and thus it is impossible to have a more comprehensive understanding of the distribution of chemical oxygen demand in the water environment, thereby reducing the accuracy and comprehensiveness of the monitoring. Summary of the invention

[0005] The purpose of the present invention is to provide a chemical oxygen demand monitoring device for a water environment to solve the problem that the monitoring device may not be able to effectively collect sample liquid from different depths in the water environment when in use, and thus cannot more comprehensively understand the distribution of chemical oxygen demand in the water environment, thereby reducing the accuracy and comprehensiveness of monitoring.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: a chemical oxygen demand monitoring device for a water environment, comprising a temporary storage box, the temporary storage box is fixed on the top surface of a bottom plate, the top surface of the temporary storage box is detachably provided with a sealing cover, and the bottom plate is provided with a layered detection component, a lifting mechanism, a filtering mechanism, a mixing mechanism, a disassembly mechanism and a discharge mechanism;

[0007] The layered detection component includes a main delivery pipe connected and fixed on the front side of the temporary storage box, the main delivery pipe is provided with a first water pump, a plurality of sampling boxes are provided on the right side of the main delivery pipe, a plurality of sampling boxes are connected and fixed with delivery branches respectively between the sampling boxes and the main delivery pipe, a plurality of the delivery branches are provided with solenoid valves respectively, a plurality of sampling boxes are connected and fixed with sampling tubes respectively on the right sides of the outer walls, a plurality of the sampling tubes are provided with a second water pump respectively, a plurality of adjacent sampling boxes are provided with connecting columns respectively between each two adjacent sampling boxes, a chemical oxygen demand analyzer is fixed on the top surface of the bottom plate, a connecting pipe is connected and fixed between the chemical oxygen demand analyzer and the temporary storage box, a third water pump is provided on the connecting pipe.

[0008] Preferably, the lifting mechanism includes a U-shaped frame fixed on the bottom plate, and the outer wall of the U-shaped frame is provided with rotating holes on the left and right sides respectively, and a rope-releasing drum is rotatably arranged between the two rotating holes, and a connecting rope is wound around the rope-releasing drum, and one end of the connecting rope is fixedly connected to the top surface of the sampling box above, and a first driving motor is fixed on the right side of the outer wall of the U-shaped frame, and the output shaft of the first driving motor is fixedly connected to the right end of the rope-releasing drum.

[0009] Preferably, the filtering mechanism includes a plurality of first filter screens respectively fixed inside the sampling box, and a second filter screen is detachably provided inside the temporary storage box.

[0010] Preferably, a counterweight column is fixed to the bottom surface of the sampling box below, and a counterweight block is fixed to the bottom end of the counterweight column.

[0011] Preferably, the mixing mechanism includes a mounting hole opened on the sealing cover, a second driving motor is fixed to the top surface of the sealing cover, a connecting cylinder is connected and fixed to the top surface of the second filter, a rotating shaft is rotatably provided inside the connecting cylinder, the top end of the rotating shaft is fixedly connected to the output shaft of the second driving motor, and L-shaped stirring plates are respectively fixed to the front and rear sides of the rotating shaft.

[0012] Preferably, a cleaning brush is fixed to the bottom end of the rotating shaft, and the cleaning brush is located on the bottom surface of the second filter screen.

[0013] Preferably, the disassembly and assembly mechanism includes two positioning blocks respectively fixed on the left and right sides of the second filter screen, the inner wall of the temporary storage box is provided with positioning grooves on the left and right sides respectively, the two positioning grooves respectively position the two positioning blocks, the top surface of the temporary storage box is provided with two threaded grooves, the top surface of the sealing cover is provided with two threaded holes, the two threaded holes are respectively threadedly connected with bolts, and the threaded ends of the two bolts are respectively connected to the internal threads of the two threaded grooves.

[0014] Preferably, the discharge mechanism includes a first discharge pipe connected and fixed on the inner bottom surface of the temporary storage box, the first discharge pipe is provided with a fourth water pump, and the right side of the chemical oxygen demand analyzer is connected and fixed with a second discharge pipe, the second discharge pipe is provided with a fifth water pump.

[0015] Compared with the prior art, the chemical oxygen demand monitoring device for a water environment using the above technical solution has the following beneficial effects:

[0016] 1. During use, the staff first places the main delivery pipe and several sampling boxes into the water environment to be monitored. In the initial state, all the solenoid valves and the second water pump are in the closed state. When the chemical oxygen demand of the water environment needs to be tested, the staff first starts the second water pump at the top to extract the sample liquid at the top of the water environment and transport it to the corresponding sampling box. At the same time, the first water pump is started and the top solenoid valve is opened to transport the sample liquid in the sampling box to the temporary storage box through the main delivery pipe. Then the third water pump is started to transport the sample liquid in the temporary storage box to the chemical oxygen demand analyzer through the connecting pipe for analysis. After the analysis is completed, the corresponding solenoid valve and the second water pump are closed, and the sample liquid in the temporary storage box and the chemical oxygen demand analyzer is discharged through the discharge mechanism. If it is necessary to test the sample liquid at different depths, just start the second water pump at the corresponding depth and repeat the above steps. By setting up layered detection components, the staff can easily obtain sample liquids at different depths in the water environment, so as to have a more comprehensive understanding of the distribution of chemical oxygen demand in the water environment, improve the accuracy and comprehensiveness of monitoring, and provide more reliable data support for water environment management;

[0017] 2. During use, the staff starts the first drive motor to make the rope-releasing drum start to rotate, thereby adjusting the length of the connecting rope. As the length of the connecting rope changes, the position of the sampling box in the water will also be adjusted accordingly, thereby realizing the lifting function of the sampling box, allowing the staff to easily obtain sample liquids of different depths without moving the entire monitoring device, improving work efficiency and flexibility, and allowing the staff to adapt to different monitoring needs more quickly. The sample liquid is first preliminarily filtered through the first filter in the sampling box to remove larger impurities, and then the sample liquid enters the temporary storage box and is filtered again through the second filter to remove finer impurities. This double filtration mechanism ensures that the sample liquid entering the chemical oxygen demand analyzer is pure, thereby improving the accuracy of the analysis results. The combined use of the counterweight column and the counterweight block increases the weight of the sampling box, allowing the sampling box to maintain a stable position in the water and not be easily affected by the water flow, ensuring that the sampling box can accurately obtain the sample liquid of the required depth;

[0018] 3. During use, after the sample liquid enters the temporary storage box through the main delivery pipe, the staff starts the second drive motor to make the shaft start to rotate. The rotation of the shaft drives the rotation of the L-shaped stirring plate, thereby stirring and mixing the sample liquid, ensuring that the sample liquid is evenly distributed in the temporary storage box, thereby improving the accuracy of subsequent analysis. When the shaft rotates through the second drive motor, the cleaning brush will also rotate. The rotation of the cleaning brush can remove impurities and residues on the bottom surface of the second filter, thereby preventing the second filter from being blocked and ensuring the continuous and effective filtering function of the second filter;

[0019] 4. During use, the combination of the threaded groove and the bolt facilitates the staff to disassemble and assemble the sealing cover and the mixing mechanism, so that the staff can clean or replace the components in the mixing mechanism. At the same time, the combination of the positioning groove and the positioning block facilitates the stable position of the second filter in the temporary storage box to prevent it from rotating. The staff can discharge the sample liquid in the temporary storage box by using the first discharge pipe and the fourth water pump. Similarly, the sample liquid analyzed by the chemical oxygen demand analyzer can be discharged by using the second discharge pipe and the fifth water pump, ensuring the timely discharge and cleaning of the sample liquid inside the temporary storage box and the chemical oxygen demand analyzer, thereby avoiding the retention and contamination of the sample liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional schematic diagram of an embodiment;

[0021] Figure 2 An exploded schematic diagram of an embodiment;

[0022] Figure 3 This is an exploded schematic diagram of the connecting column and the counterweight block in the embodiment;

[0023] Figure 4 It is a schematic diagram of the explosion of the U-shaped frame and the rope drum in the embodiment;

[0024] Figure 5 It is a cross-sectional schematic diagram of the sampling box in the embodiment;

[0025] Figure 6 It is a cross-sectional schematic diagram of the temporary storage box in the embodiment;

[0026] Figure 7 For example Figure 2 Enlarged schematic diagram at point A in the middle.

[0027] In the figure: 1, temporary storage box; 2, bottom plate; 3, sealing cover; 4, main delivery pipe; 5, first water pump; 6, sampling box; 7, delivery branch pipe; 8, solenoid valve; 9, sampling tube; 10, second water pump; 11, connecting column; 12, chemical oxygen demand analyzer; 13, connecting pipe; 14, third water pump; 15, U-shaped frame; 16, rotating hole; 17, rope drum; 18, connecting rope; 19, first drive motor; 20, The first filter screen; 21. The second filter screen; 22. The counterweight column; 23. The counterweight block; 24. The mounting hole; 25. The second drive motor; 26. The connecting cylinder; 27. The rotating shaft; 28. The L-shaped stirring plate; 29. ​​The cleaning brush; 30. The positioning block; 31. The positioning groove; 32. The threaded groove; 33. The threaded hole; 34. The bolt; 35. The first discharge pipe; 36. The fourth water pump; 37. The second discharge pipe; 38. The fifth water pump. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1-Figure 7 As shown, a chemical oxygen demand monitoring device for a water environment includes a temporary storage box 1, which is fixed to the top surface of a bottom plate 2, and a sealing cover 3 is detachably provided on the top surface of the temporary storage box 1. A layered detection component, a lifting mechanism, a filtering mechanism, a mixing mechanism, a disassembly mechanism, and a discharge mechanism are provided on the bottom plate 2;

[0030] The layered detection component includes a main delivery pipe 4 connected and fixed on the front side of the temporary storage box 1, the main delivery pipe 4 is provided with a first water pump 5, a plurality of sampling boxes 6 are provided on the right side of the main delivery pipe 4, a plurality of sampling boxes 6 are connected and fixed with delivery branch pipes 7 respectively between the plurality of sampling boxes 6 and the main delivery pipe 4, a plurality of delivery branch pipes 7 are provided with solenoid valves 8 respectively, a plurality of sampling boxes 6 are connected and fixed with sampling tubes 9 respectively on the right sides of the outer walls, a plurality of sampling tubes 9 are provided with second water pumps 10 respectively, a connecting column 11 is fixed between each adjacent two sampling boxes 6 of the plurality of sampling boxes 6, a chemical oxygen demand analyzer 12 is fixed on the top surface of the bottom plate 2, the chemical oxygen demand analyzer 12 is the prior art, the model of the chemical oxygen demand analyzer 12 is DR6000 COD analyzer, a connecting pipe 13 is connected and fixed between the chemical oxygen demand analyzer 12 and the temporary storage box 1, a third water pump 14 is provided on the connecting pipe 13.

[0031] During use, the staff first places the main delivery pipe 4 and several sampling boxes 6 into the water environment to be monitored. In the initial state, all the solenoid valves 8 and the second water pump 10 are in the closed state. When the chemical oxygen demand of the water environment needs to be detected, the staff first starts the second water pump 10 at the top to extract the sample liquid at the top of the water environment and transport it to the corresponding sampling box 6. At the same time, the first water pump 5 is started and the top solenoid valve 8 is opened to transport the sample liquid in the sampling box 6 to the temporary storage box 1 through the main delivery pipe 4. Then the third water pump 14 is started to transport the sample liquid in the temporary storage box 1 to the chemical oxygen demand analyzer 12 for analysis through the connecting pipe 13. After the analysis is completed, the corresponding solenoid valves 8 and the second water pump 10 are closed, and the sample liquid in the temporary storage box 1 and the chemical oxygen demand analyzer 12 is discharged through the discharge mechanism. If it is necessary to detect the sample liquid at different depths, it is only necessary to start the second water pump 10 at the corresponding depth and repeat the above steps. By setting up layered detection components, staff can easily obtain sample liquids at different depths in the water environment, thereby gaining a more comprehensive understanding of the distribution of chemical oxygen demand in the water environment, improving the accuracy and comprehensiveness of monitoring and providing more reliable data support for water environment management.

[0032] like Figure 1-Figure 5 As shown, the lifting mechanism includes a U-shaped frame 15 fixed on the base plate 2, and the outer wall of the U-shaped frame 15 is provided with rotating holes 16 on the left and right sides respectively, and a rope-releasing drum 17 is rotatably arranged between the two rotating holes 16, and a connecting rope 18 is wound around the rope-releasing drum 17, and one end of the connecting rope 18 is fixedly connected to the top surface of the sampling box 6 above, and a first driving motor 19 is fixedly connected to the right side of the outer wall of the U-shaped frame 15, and the output shaft of the first driving motor 19 is fixedly connected to the right end of the rope-releasing drum 17.

[0033] During use, the staff starts the first drive motor 19 to make the rope-releasing drum 17 start to rotate, thereby adjusting the length of the connecting rope 18. As the length of the connecting rope 18 changes, the position of the sampling box 6 in the water will also be adjusted accordingly, thereby realizing the lifting function of the sampling box 6, allowing the staff to easily obtain sample liquids at different depths without moving the entire monitoring device, thereby improving work efficiency and flexibility, and allowing the staff to adapt to different monitoring needs more quickly.

[0034] like Figure 1-Figure 7As shown, the filtering mechanism includes a plurality of first filter screens 20 respectively fixed inside the sampling box 6, a second filter screen 21 is detachably provided inside the temporary storage box 1, a counterweight column 22 is fixed to the bottom surface of the sampling box 6 below, a counterweight block 23 is fixed to the bottom end of the counterweight column 22, the mixing mechanism includes a mounting hole 24 opened on the sealing cover 3, a second drive motor 25 is fixed to the top surface of the sealing cover 3, a connecting cylinder 26 is connected and fixed to the top surface of the second filter screen 21, a rotating shaft 27 is rotatably provided inside the connecting cylinder 26, the top end of the rotating shaft 27 is fixedly connected to the output shaft of the second drive motor 25, and an L-shaped stirring plate 28 is fixed to the front and rear sides of the rotating shaft 27 respectively.

[0035] In use, the sample liquid is first filtered through the first filter screen 20 in the sampling box 6 to remove larger impurities, and then the sample liquid enters the temporary storage box 1 and is filtered again through the second filter screen 21 to remove smaller impurities. This double filtering mechanism ensures that the sample liquid entering the chemical oxygen demand analyzer 12 is pure, thereby improving the accuracy of the analysis results. The combined use of the counterweight column 22 and the counterweight block 23 increases the weight of the sampling box 6, so that the sampling box 6 can maintain a stable position in the water and is not easily affected by the water flow, ensuring that the sampling box 6 can accurately obtain the sample liquid of the required depth. After the sample liquid enters the temporary storage box 1 through the conveying main pipe 4, the staff starts the second drive motor 25, so that the rotating shaft 27 starts to rotate. The rotation of the rotating shaft 27 drives the rotation of the L-shaped stirring plate 28, thereby stirring and mixing the sample liquid, ensuring that the sample liquid is evenly distributed in the temporary storage box 1, thereby improving the accuracy of subsequent analysis.

[0036] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a cleaning brush 29 is fixed to the bottom end of the rotating shaft 27, and the cleaning brush 29 is located on the bottom surface of the second filter screen 21. The disassembly and assembly mechanism includes two positioning blocks 30 respectively fixed on the left and right sides of the second filter screen 21. Positioning grooves 31 are respectively provided on the left and right sides of the inner wall of the temporary storage box 1, and the two positioning grooves 31 respectively position the two positioning blocks 30. The top surface of the temporary storage box 1 is provided with two threaded grooves 32, and the top surface of the sealing cover 3 is provided with two threaded holes 33. Bolts 34 are respectively threadedly connected in the two threaded holes 33, and the threaded ends of the two bolts 34 are respectively threadedly connected to the inner threads of the two threaded grooves 32. The discharge mechanism includes a first discharge pipe 35 connected and fixed to the inner bottom surface of the temporary storage box 1, and a fourth water pump 36 is provided on the first discharge pipe 35. A second discharge pipe 37 is connected and fixed to the right side of the chemical oxygen demand analyzer 12, and a fifth water pump 38 is provided on the second discharge pipe 37.

[0037] In use, when the rotating shaft 27 is rotated by the second driving motor 25, the cleaning brush 29 will also rotate accordingly. The rotation of the cleaning brush 29 can remove impurities and residues on the bottom surface of the second filter 21, thereby preventing the second filter 21 from being blocked and ensuring the continuous and effective filtering function of the second filter 21. The threaded groove 32 and the bolt 34 are used in conjunction with each other, which is convenient for the staff to disassemble and assemble the sealing cover 3 and the mixing mechanism, so that the staff can clean or replace the components in the mixing mechanism. At the same time, the positioning groove 31 and the positioning block 30 are used in conjunction with each other, which is convenient to ensure the stable position of the second filter 21 in the temporary storage box 1 and prevent it from rotating. The staff can discharge the sample liquid in the temporary storage box 1 by using the first discharge pipe 35 and the fourth water pump 36. Similarly, the sample liquid analyzed by the chemical oxygen demand analyzer 12 can be discharged by using the second discharge pipe 37 and the fifth water pump 38, ensuring the timely discharge and cleaning of the sample liquid inside the temporary storage box 1 and the chemical oxygen demand analyzer 12, thereby avoiding the retention and contamination of the sample liquid.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A chemical oxygen demand monitoring device for a water environment, comprising a temporary storage box (1), wherein the temporary storage box (1) is fixed on the top surface of a bottom plate (2), characterized in that: The top surface of the temporary storage box (1) is detachably provided with a sealing cover (3), and the bottom plate (2) is provided with a layer detection component, a lifting mechanism, a filtering mechanism, a mixing mechanism, a disassembly mechanism and a discharge mechanism; The stratified detection assembly comprises a main delivery pipe (4) connected and fixed on the front side of the temporary storage box (1), the main delivery pipe (4) is provided with a first water pump (5), a plurality of sampling boxes (6) are provided on the right side of the main delivery pipe (4), a plurality of the sampling boxes (6) are connected and fixed with delivery branch pipes (7) respectively between the main delivery pipe (4), a plurality of the delivery branch pipes (7) are provided with solenoid valves (8), a plurality of the sampling boxes (6) are connected and fixed with sampling tubes (9) respectively on the right side of the outer wall, a plurality of the sampling tubes (9) are provided with a second water pump (10), a connecting column (11) is fixed between each adjacent two sampling boxes (6) of the plurality of the sampling boxes (6), a chemical oxygen demand analyzer (12) is fixed on the top surface of the bottom plate (2), a connecting pipe (13) is connected and fixed between the chemical oxygen demand analyzer (12) and the temporary storage box (1), a third water pump (14) is provided on the connecting pipe (13).

2. The device for monitoring chemical oxygen demand of a water environment according to claim 1, characterized in that: The lifting mechanism comprises a U-shaped frame (15) fixed on the bottom plate (2), and a rotating hole (16) is respectively opened on the left and right sides of the outer wall of the U-shaped frame (15), and a rope-releasing drum (17) is rotatably arranged between the two rotating holes (16), and a connecting rope (18) is wound around the rope-releasing drum (17), and one end of the connecting rope (18) is fixedly connected to the top surface of the sampling box (6) above, and a first driving motor (19) is fixedly connected to the right side of the outer wall of the U-shaped frame (15), and the output shaft of the first driving motor (19) is fixedly connected to the right end of the rope-releasing drum (17).

3. The device for monitoring chemical oxygen demand of a water environment according to claim 2, characterized in that: The filtering mechanism comprises a plurality of first filter screens (20) respectively fixed inside the sampling box (6), and a second filter screen (21) is detachably arranged inside the temporary storage box (1).

4. The device for monitoring chemical oxygen demand of a water environment according to claim 3, characterized in that: A counterweight column (22) is fixed to the bottom surface of the sampling box (6) below, and a counterweight block (23) is fixed to the bottom end of the counterweight column (22).

5. The device for monitoring chemical oxygen demand of a water environment according to claim 1, characterized in that: The mixing mechanism comprises a mounting hole (24) provided on the sealing cover (3); a second driving motor (25) is fixed on the top surface of the sealing cover (3); a connecting cylinder (26) is connected and fixed to the top surface of the second filter screen (21); a rotating shaft (27) is rotatably arranged inside the connecting cylinder (26); the top end of the rotating shaft (27) is fixedly connected to the output shaft of the second driving motor (25); and L-shaped stirring plates (28) are respectively fixed to the front and rear sides of the rotating shaft (27).

6. The device for monitoring chemical oxygen demand of a water environment according to claim 5, characterized in that: A cleaning brush (29) is fixed to the bottom end of the rotating shaft (27), and the cleaning brush (29) is located on the bottom surface of the second filter screen (21).

7. The device for monitoring chemical oxygen demand of a water environment according to claim 6, characterized in that: The disassembly and assembly mechanism comprises two positioning blocks (30) respectively fixed on the left and right sides of the second filter screen (21); the inner wall of the temporary storage box (1) is provided with positioning grooves (31) on the left and right sides respectively; the two positioning grooves (31) respectively position the two positioning blocks (30); the top surface of the temporary storage box (1) is provided with two threaded grooves (32); the top surface of the sealing cover (3) is provided with two threaded holes (33); bolts (34) are respectively threadedly connected in the two threaded holes (33); the threaded ends of the two bolts (34) are respectively threadedly connected to the inner parts of the two threaded grooves (32).

8. The device for monitoring chemical oxygen demand of a water environment according to claim 7, characterized in that: The discharge mechanism comprises a first discharge pipe (35) connected and fixed to the inner bottom surface of the temporary storage box (1), a fourth water pump (36) being provided on the first discharge pipe (35), and a second discharge pipe (37) connected and fixed to the right side of the chemical oxygen demand analyzer (12), a fifth water pump (38) being provided on the second discharge pipe (37).

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