An in-situ circulating continuous monitoring device and method for different water body oxygen consumption rates

Abstract

The present invention discloses an in-situ circulating continuous monitoring device and method for oxygen consumption rates of different water bodies. Target water is extracted by a water pump, mixed with air generated by an air pump, and then enters an oxygen consumption bottle. A dissolved oxygen recorder is used to record the reduction of dissolved oxygen in the oxygen consumption bottle at a preset time to obtain the oxygen consumption rate of the target water body. The water pump is controlled by a time-controlled switch to extract target water into the oxygen consumption bottle at intervals, and the air pump is used to oxygenate the low-dissolved oxygen water body. This can realize continuous monitoring of the oxygen consumption rate of the in-situ water body at different time periods, and can also measure the oxygen consumption rate of water bodies with extremely low dissolved oxygen content or 0 mg / L. Measuring the consumption rate of dissolved oxygen in water bodies is helpful to evaluate the health status of the ecological environment of water bodies, understand the interaction mechanism between aquatic organisms, and provide a theoretical basis and technical support for river and lake ecological health assessment and ecological restoration.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological environment monitoring, and in particular relates to an in-situ cyclic continuous monitoring device and method for oxygen consumption rates of different water bodies. Background Art

[0002] Dissolved oxygen (DO) levels in water are a key indicator of water quality, and the level of DO in aquatic ecosystems is directly related to the survival of aquatic life. In natural waters, DO consumption primarily comes from the respiration of aquatic plants and animals and the decomposition of organic matter. Increased pollutant loads in lakes and reservoirs can lead to eutrophication, with varying effects depending on the severity of the pollution. Eutrophic lakes and reservoirs typically manifest as a rapid increase in surface phytoplankton over a short period of time, known as an algal bloom. This rapid proliferation of phytoplankton accelerates DO depletion, and the microbial degradation of phytoplankton during their death also consumes significant amounts of oxygen, leading to hypoxia. In heavily polluted waters, excessive organic matter, decomposed by microorganisms, consumes significant amounts of oxygen, resulting in hypoxia and the resulting black, odorous water. The consumption rate of dissolved oxygen in water bodies with different degrees of pollution is inconsistent. Measuring the consumption rate of dissolved oxygen in water bodies helps to assess the health of the water body's ecological environment, understand the interaction mechanism between aquatic organisms, and provide a theoretical basis and technical support for river and lake ecological health assessment and ecological restoration.

[0003] The current method for measuring the oxygen consumption rate of water bodies is mainly the black and white bottle method. By collecting water samples for in-situ incubation, the oxygen consumption rate of the water body is calculated by measuring the reduction of oxygen in the black bottle. However, this method has the following two shortcomings: (1) The oxygen consumption rate of water bodies varies during the day and night. Under the influence of water temperature, light and other conditions, the oxygen consumption rate of water bodies in different time periods varies. The black and white bottle method cannot achieve continuous monitoring of the oxygen consumption rate of water bodies in different time periods within a day; (2) For some heavily polluted black and odorous water bodies or oxygen-deficient water bodies at the bottom of lakes and reservoirs, the oxygen dissolved in the water by the air is immediately consumed due to its own high oxygen consumption rate, resulting in extremely low dissolved oxygen content in the water, even close to 0 mg / L. The traditional black and white bottle method cannot measure the oxygen consumption rate of water bodies with a dissolved oxygen content of 0 mg / L. Summary of the Invention

[0004] The present invention provides an in-situ cyclic continuous monitoring device and method for oxygen consumption rates of different water bodies. The present invention can realize continuous monitoring of oxygen consumption rates of water bodies in situ at different time periods and can realize rapid determination of oxygen consumption rates of water bodies.

[0005] To solve the above problems, the present invention provides the following technical solutions:

[0006] An embodiment of the present invention provides an in-situ circulation continuous monitoring device for oxygen consumption rates of different water bodies, comprising a water pump (1), an air pump (2), a dissolved oxygen recorder (3), an oxygen consumption bottle (4), a PU tube (5), a T-shaped three-way valve (6), and a time-controlled switch (7);

[0007] The water inlet pipe (1-1) of the water pump (1) is used for extracting the water body to be monitored in situ, and the water outlet pipe (1-2) of the water pump (1) and the air outlet pipe (2-1) of the air pump (2) are connected to the PU tube (5) through the T-shaped three-way pipe (6); the oxygen consumption bottle (4) is a brown reagent bottle made of high borosilicate glass with a volume of 500 ml, and a stainless steel four-way bottle cap is provided at the bottle mouth, and the four interfaces on the stainless steel four-way bottle cap are respectively inserted with the PU tube (5), the overflow outlet pipe (4-1) of the oxygen consumption bottle, the dissolved oxygen sensor (3-1) and the temperature sensor (3-2); the dissolved oxygen sensor (3-1) and the temperature sensor (3-2) are respectively electrically connected to the dissolved oxygen recorder (3) through signal lines;

[0008] The water pump (1) and the air pump (2) are electrically connected to a socket board (8) via wires, respectively; the socket board (8) is electrically connected to the time-controlled switch (7) via a signal line; and the time-controlled switch (7) is electrically connected to a power supply via wires.

[0009] According to an optional embodiment of the present invention, the water pump (1) is a small diaphragm pump with a head of 10m, a suction head of 2m, an inner diameter of the water inlet and outlet of 6mm, and a maximum flow rate of 5L / min.

[0010] According to an optional embodiment of the present invention, the air pump (2) is a small air pump with a pressure of 0.02 MPa, an outer diameter of an air outlet of 4 mm, and an air output of 4.5 L / min.

[0011] According to an optional embodiment of the present invention, the dissolved oxygen recorder (3) is a fiber optic oxygen meter with a dissolved oxygen measurement range of 0 to 40 mg / L and a maximum measurement frequency of 1 time / s, which continuously records the dissolved oxygen data of the water body. The temperature sensor (3-2) has a measurement range of 0 to 50°C and is used for temperature measurement and calibration of the dissolved oxygen sensor (3-1).

[0012] According to an optional embodiment of the present invention, the PU tube (5) is a transparent polyurethane hose with an outer diameter of 6 mm and an inner diameter of 4 mm, and can withstand a pressure of 0.1 MPa.

[0013] According to an optional embodiment of the present invention, the time-controlled switch (7) is a microcomputer time-controlled switch timer, which controls the power-on state of the power strip (8) by setting the switch time.

[0014] An embodiment of the present invention further provides an in-situ cyclic continuous monitoring method for different water body oxygen consumption rates, which is implemented by an in-situ cyclic continuous monitoring device for different water body oxygen consumption rates as described in the above embodiment, wherein the in-situ cyclic continuous monitoring method includes:

[0015] Step S1, place the water inlet pipe (1-1) of the water pump (1) into the water body to be monitored, set the time switch (7) to be powered on for 10 minutes every 2 hours, and turn on the dissolved oxygen recorder (3) to start recording;

[0016] Step S2, after power is turned on, the water pump (1) and the air pump (2) start working at the same time, the water in the water outlet pipe (1-2) of the water pump (1) and the air generated by the air outlet pipe (2-1) of the air pump (2) are mixed through the T-shaped three-way (6) and then enter the PU pipe (5) connected to the oxygen consumption bottle (4), and the excess water is discharged from the overflow outlet pipe (4-1) of the oxygen consumption bottle;

[0017] Step S3, after the power is turned on, the water pump (1) and the air pump (2) stop working, and the dissolved oxygen sensor (3-1) and the temperature sensor (3-2) connected to the dissolved oxygen recorder (3) continuously record the dissolved oxygen and water temperature changes in the oxygen consumption bottle (4); by calculating the reduction value of the dissolved oxygen in the oxygen consumption bottle (4) at a preset time, the oxygen consumption rate of the measured water body in the current time period can be obtained; wherein, the water pump (1) plays the role of refreshing the external water body, and the dissolved oxygen in the oxygen consumption bottle (4) is consumed. The time-controlled switch (7) controls the power supply to make the water pump (1) work to extract external water and send it into the oxygen consumption bottle (4), and discharge the water in the oxygen consumption bottle (4) whose oxygen consumption rate has been measured; the air pump (2) plays an oxygenation role. For some black and odorous water bodies that are seriously polluted and whose dissolved oxygen is close to 0 mg / L, the air generated by the air pump (2) can first oxygenate the black and odorous water bodies extracted by the water pump (1), and then send the oxygenated water bodies into the oxygen consumption bottle (4) to measure the oxygen consumption rate of the black and odorous water bodies;

[0018] The formula for calculating the oxygen consumption rate of water is:

[0019]

[0020] Among them, O t1 The dissolved oxygen concentration in the oxygen consumption bottle (4) when the water pump and the air pump are stopped after the power is turned on, in mg / L, O t2 The dissolved oxygen concentration in the oxygen consumption bottle (4) before the water pump (1) and the air pump (2) are turned on next time, mg / L, h is O t1 and O t2 The preset time interval between the two, in hours.

[0021] Beneficial effect: The embodiment of the present invention provides an in-situ circulation continuous monitoring device and method for oxygen consumption rates of different water bodies, the in-situ circulation continuous monitoring device includes a water pump, an air pump, a dissolved oxygen recorder, an oxygen consumption bottle, a PU tube, a T-type tee and a time-controlled switch; the in-situ circulation continuous monitoring method for oxygen consumption rates of different water bodies is realized by using the in-situ circulation continuous monitoring device, the target water body is pumped by the water pump, and the water is mixed with the air generated by the air pump and then enters the oxygen consumption bottle, and the dissolved oxygen recorder is used to record the reduction of dissolved oxygen per unit time in the oxygen consumption bottle to obtain the oxygen consumption rate of the target water body; the water pump is controlled by the time-controlled switch to pump the target water body into the oxygen consumption bottle at intervals, and the air pump is used to oxygenate the low-dissolved oxygen water body, so as to realize continuous monitoring of the oxygen consumption rate of the in-situ water body in different time periods, and the oxygen consumption rate of the water body with extremely low dissolved oxygen content or 0 mg / L can also be measured; measuring the consumption rate of dissolved oxygen in water bodies is helpful to evaluate the health status of the ecological environment of water bodies, understand the interaction mechanism between aquatic organisms, and provide a theoretical basis and technical support for river and lake ecological health assessment and ecological restoration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of an in-situ circulating continuous monitoring device for different water oxygen consumption rates provided in an embodiment of the present application.

[0024] Figure 2 This is a schematic diagram of the connections among a water pump, an air pump, and a T-joint in an in-situ circulation continuous monitoring device for different water oxygen consumption rates provided in an embodiment of the present application.

[0025] Figure 3 This is a schematic diagram of the structure of an oxygen consumption bottle in an in-situ circulating continuous monitoring device for different water oxygen consumption rates provided in an embodiment of the present application.

[0026] Figure 4 A schematic diagram of the power supply of a water pump and an air pump in an in-situ circulation continuous monitoring device for different water oxygen consumption rates provided in an embodiment of the present application.

[0027] Figure 5 A physical picture of an indoor experiment for continuously monitoring oxygen consumption rates of different water bodies provided in an embodiment of the present application.

[0028] Figure 6 This is a dissolved oxygen saturation curve of an oxygen consumption bottle for an indoor experiment of continuous monitoring of oxygen consumption rates of different water bodies provided in an embodiment of the present application.

[0029] Figure 7 This is a graph showing the relationship between oxygen consumption rate and chlorophyll concentration during an algal bloom outbreak, as provided in an embodiment of the present application.

[0030] Figure 8 This is a graph showing the relationship between oxygen consumption rate and chlorophyll concentration during the bloom subsidence period provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0032] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present invention provides an in-situ circulation continuous monitoring device for oxygen consumption rates of different water bodies, including a water pump 1, an air pump 2, a dissolved oxygen recorder 3, an oxygen consumption bottle 4, a PU tube 5, a T-type three-way 6 and a time-controlled switch 7.

[0033] Water pump 1's inlet pipe 1-1 is used to extract the water to be monitored in situ. Water pump 1's outlet pipe 1-2 and air pump 2's outlet pipe 2-1 are connected to PU tubing 5 via a T-junction 6. Oxygen consumption bottle 4 is a brown reagent bottle made of high borosilicate glass with a capacity of 500ml. Its mouth is fitted with a stainless steel four-way cap. Four ports on this cap receive the PU tubing 5, the overflow outlet pipe 4-1 of the oxygen consumption bottle, a dissolved oxygen sensor 3-1, and a temperature sensor 3-2. The dissolved oxygen sensor 3-1 and the temperature sensor 3-2 are each electrically connected to the dissolved oxygen recorder 3 via signal lines. In this embodiment, water drawn by water pump 1 and air exhausted by air pump 2 enter the PU tubing 5 connected to the oxygen consumption bottle 4, where the water and air mix.

[0034] The PU tube 5 directly leads to the bottom of the oxygen consumption bottle 4, and the overflow outlet pipe 4-1 is connected to the bottle mouth. The overflow outlet pipe 4-1 is 2m long to ensure that the water inside and outside the oxygen consumption bottle 4 is not exchanged through the overflow outlet pipe 4-1.

[0035] like Figure 4 As shown, water pump 1 and air pump 2 are each electrically connected to a power strip 8 via wires. Power strip 8 is electrically connected to a timer switch 7 via a signal line. Timer switch 7 is electrically connected to a power source via wires. In this embodiment, water pump 1 is electrically connected to power strip 8 via wires 1-3, and air pump 2 is electrically connected to power strip 8 via wire 2-2.

[0036] Water pump 1 is a small diaphragm pump with a head of 10m, a suction head of 2m, an inner diameter of its water inlet and outlet of 6mm, and a maximum flow rate of 5L / min. Air pump 2 is a small air pump with a pressure of 0.02Mpa, an outer diameter of its air outlet of 4mm, and an air output of 4.5L / min.

[0037] Dissolved oxygen recorder 3 is a fiber-optic oxygen meter with a measurement range of 0 to 40 mg / L and a maximum measurement frequency of 1 per second. It continuously records dissolved oxygen data in the water. Temperature sensor 3-2 has a measurement range of 0 to 50°C and is used for temperature measurement and calibration of dissolved oxygen sensor 3-1. Dissolved oxygen recorder 3 is also electrically connected to computer 9.

[0038] The PU tube 5 is a transparent polyurethane hose with an outer diameter of 6 mm and an inner diameter of 4 mm, and can withstand a pressure of 0.1 MPa. The time switch 7 is a microcomputer time switch timer, which controls the power state of the power strip 8 by setting the switch time.

[0039] An embodiment of the present invention further provides an in-situ cyclic continuous monitoring method for different water body oxygen consumption rates, which is implemented by an in-situ cyclic continuous monitoring device for different water body oxygen consumption rates as described in the above embodiment. The in-situ cyclic continuous monitoring method includes:

[0040] Step S1: Place the water inlet pipe 1-1 of the water pump 1 into the water body to be monitored, set the timer switch 7 to be powered on for 10 minutes every 2 hours, and turn on the dissolved oxygen recorder 3 to start recording;

[0041] Step S2: After power is turned on, the water pump 1 and the air pump 2 start working at the same time. The water in the water outlet pipe 1-2 of the water pump 1 and the air generated by the air outlet pipe 2-1 of the air pump 2 are mixed through the T-shaped tee 6 and then enter the PU pipe 5 connected to the oxygen consumption bottle 4. The excess water is discharged from the overflow outlet pipe 4-1 of the oxygen consumption bottle.

[0042] Step S3, after the power is turned on, the water pump 1 and the air pump 2 stop working, and the dissolved oxygen sensor 3-1 and the temperature sensor 3-2 connected to the dissolved oxygen recorder 3 continuously record the changes in dissolved oxygen and water temperature in the oxygen consumption bottle 4; by calculating the reduction value of dissolved oxygen in the oxygen consumption bottle 4 at a preset time, the oxygen consumption rate of the measured water body in the current time period can be obtained; wherein, the water pump 1 plays the role of updating the external water body. After the dissolved oxygen in the oxygen consumption bottle 4 is consumed, the time-controlled switch 7 controls the power on to make the water pump 1 work to extract the external water body into the oxygen consumption bottle 4, and discharge the water in the oxygen consumption bottle 4 with the measured oxygen consumption rate; the air pump 2 plays the role of oxygenation. For some black and odorous water bodies that are seriously polluted and the dissolved oxygen in the water is close to 0 mg / L, the air generated by the air pump 2 can first oxygenate the black and odorous water body extracted by the water pump 1, and then send the oxygenated water body into the oxygen consumption bottle 4 to measure the oxygen consumption rate of the black and odorous water body.

[0043] The formula for calculating the oxygen consumption rate of water is:

[0044]

[0045] Among them, O t1 The dissolved oxygen concentration in the oxygen consumption bottle 4 when the water pump and the air pump are stopped after the power is turned on, in mg / L, O t2 The dissolved oxygen concentration in the oxygen consumption bottle 4 before the water pump 1 and the air pump 2 are turned on next time, mg / L, h is O t1 and O t2 The preset time interval between the two, in hours.

[0046] The present invention implements cyclical and continuous monitoring of the in-situ water oxygen consumption rate by providing intermittent energization of a timed switch 7, enabling oxygen consumption bottle 4 to periodically refresh the external water. The present invention configures the timed switch 7 to be energized for 10 minutes every two hours. During energization, the aerated water generated by the simultaneous operation of water pump 1 and air pump 2 enters oxygen consumption bottle 4, and excess water is discharged through its overflow outlet pipe 4-1.

[0047] Based on the above implementation method, an in-situ circulation continuous monitoring device for different water oxygen consumption rates was tested through indoor experiments and field in-situ monitoring, and in-situ continuous monitoring of different water oxygen consumption rates was successfully achieved.

[0048] The actual picture of the in-situ cycle continuous monitoring device of the present invention and the indoor experimental process are as follows Figure 5 As shown in the figure, algae water with a chlorophyll concentration of 20ug / L was cultured indoors under light-free conditions. The dissolved oxygen in the water body was continuously reduced to 70% saturation (4mg / L) due to the consumption of algae respiration. The oxygen consumption rate of the water body was monitored using an in-situ circulating continuous monitoring device with different water body oxygen consumption rates. The results are shown in the figure. Figure 6 As the time-controlled switch is powered on, the cycle of water change and oxygenation in the oxygen consumption bottle is realized, followed by oxygen consumption and then water change and oxygenation. Based on the changes in dissolved oxygen in the oxygen consumption bottle 4 recorded by the dissolved oxygen sensor 3-1, the oxygen consumption rate of the monitored water is 0.3 mg / L·h. -1 .

[0049] The present invention was applied to carry out in-situ monitoring of the water bloom process in Xiangxi River Bay of the Three Gorges Reservoir, and the oxygen consumption rate of the water at different stages of the bloom was continuously observed. The monitoring results are as follows: Figure 7 and Figure 8 The results show that the oxygen consumption rate of water bodies during the bloom growth period increases with the increase of chlorophyll concentration. At the same time, at the same chlorophyll concentration, the oxygen consumption rate of water bodies during the bloom retreat period is higher than that during the bloom growth period. The present invention successfully realizes the continuous monitoring of the in-situ oxygen consumption rate of water bodies.

[0050] The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited to this. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention; ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A method for in-situ continuous circulation monitoring of oxygen consumption rates of different water bodies, which is achieved by an in-situ continuous circulation monitoring device for oxygen consumption rates of different water bodies, wherein the in-situ continuous circulation monitoring device comprises a water pump (1), an air pump (2), a dissolved oxygen recorder (3), an oxygen consumption bottle (4), a PU tube (5), a T-type three-way valve (6) and a time-controlled switch (7); The water inlet pipe (1-1) of the water pump (1) is used for extracting the water body to be monitored in situ, and the water outlet pipe (1-2) of the water pump (1) and the air outlet pipe (2-1) of the air pump (2) are connected to the PU tube (5) through the T-shaped three-way pipe (6); the oxygen consumption bottle (4) is a brown reagent bottle made of high borosilicate glass with a volume of 500 ml, and a stainless steel four-way bottle cap is provided at the bottle mouth, and the four interfaces on the stainless steel four-way bottle cap are respectively inserted with the PU tube (5), the overflow outlet pipe (4-1) of the oxygen consumption bottle, the dissolved oxygen sensor (3-1) and the temperature sensor (3-2); the dissolved oxygen sensor (3-1) and the temperature sensor (3-2) are respectively electrically connected to the dissolved oxygen recorder (3) through signal lines; The water pump (1) and the air pump (2) are electrically connected to a socket board (8) via wires, the socket board (8) is electrically connected to the time-controlled switch (7) via a signal line, and the time-controlled switch (7) is electrically connected to a power supply via wires; It is characterized in that The in-situ circulation continuous monitoring method comprises: Step S1, place the water inlet pipe (1-1) of the water pump (1) into the water body to be monitored, set the time switch (7) to be powered on for 10 minutes every 2 hours, and turn on the dissolved oxygen recorder (3) to start recording; Step S2, after power is turned on, the water pump (1) and the air pump (2) start working at the same time, the water in the water outlet pipe (1-2) of the water pump (1) and the air generated by the air outlet pipe (2-1) of the air pump (2) are mixed through the T-shaped three-way (6) and then enter the PU pipe (5) connected to the oxygen consumption bottle (4), and the excess water is discharged from the overflow outlet pipe (4-1) of the oxygen consumption bottle; Step S3, after the power is turned on, the water pump (1) and the air pump (2) stop working, and the dissolved oxygen sensor (3-1) and the temperature sensor (3-2) connected to the dissolved oxygen recorder (3) continuously record the dissolved oxygen and water temperature changes in the oxygen consumption bottle (4); by calculating the reduction value of the dissolved oxygen in the oxygen consumption bottle (4) at a preset time, the oxygen consumption rate of the measured water body in the current time period can be obtained; wherein, the water pump (1) plays the role of updating the external water body, and the dissolved oxygen in the oxygen consumption bottle (4) is consumed. Afterwards, the time-controlled switch (7) controls the power supply to make the water pump (1) work to extract the external water body and send it into the oxygen consumption bottle (4), and discharge the water in the oxygen consumption bottle (4) whose oxygen consumption rate has been measured; the air pump (2) plays an oxygenation role. For some black and odorous water bodies that are seriously polluted and whose dissolved oxygen content is close to 0 mg / L, the air generated by the air pump (2) first oxygenates the black and odorous water body extracted by the water pump (1), and then sends the oxygenated water body into the oxygen consumption bottle (4) to measure the oxygen consumption rate of the black and odorous water body; The formula for calculating the oxygen consumption rate of water is: Among them, O t1 The dissolved oxygen concentration in the oxygen consumption bottle (4) when the water pump and the air pump are stopped after the power is turned on, in mg / L, O t2 The dissolved oxygen concentration in the oxygen consumption bottle (4) before the water pump (1) and the air pump (2) are turned on next time, mg / L, h is O t1 and O t2 The preset time interval between the two, in hours.

2. The in-situ cyclic continuous monitoring method of oxygen consumption rates of different water bodies according to claim 1, characterized in that: The water pump (1) is a small diaphragm pump with a lift of 10 m, a suction lift of 2 m, an inner diameter of the water inlet and outlet of 6 mm, and a maximum flow rate of 5 L / min.

3. The in-situ cyclic continuous monitoring method of oxygen consumption rates of different water bodies according to claim 2, characterized in that: The air pump (2) is a small air pump with a pressure of 0.02 MPa, an air outlet with an outer diameter of 4 mm, and an air output of 4.5 L / min.

4. The in-situ cyclic continuous monitoring method of oxygen consumption rates of different water bodies according to claim 3, characterized in that: The dissolved oxygen recorder (3) is a fiber-optic oxygen meter with a dissolved oxygen measurement range of 0 to 40 mg / L and a maximum measurement frequency of 1 time / s, which continuously records dissolved oxygen data in water. The temperature sensor (3-2) has a measurement range of 0 to 50°C and is used for temperature measurement and calibration of the dissolved oxygen sensor (3-1).

5. The in-situ cyclic continuous monitoring method of oxygen consumption rates of different water bodies according to claim 4, characterized in that: The PU tube (5) is a transparent polyurethane hose with an outer diameter of 6 mm and an inner diameter of 4 mm, and can withstand a pressure of 0.1 MPa.

6. The in-situ cyclic continuous monitoring method of oxygen consumption rates of different water bodies according to claim 5, characterized in that: The time-controlled switch (7) is a microcomputer time-controlled switch timer, which controls the power-on state of the socket (8) by setting the switch time.

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