A device for precise underwater in-situ testing of BOD

Abstract

This invention provides an underwater in-situ precision testing device for BOD, relating to the field of water quality testing technology. It includes an underwater probe and an above-water support device. The underwater probe comprises a water pump and a microbial electrolysis chamber. The water pump pumps water into the microbial electrolysis chamber for BOD testing. The microbial electrolysis chamber transmits the BOD test data to the above-water support device for display. The water pump also pumps the BOD-tested water out. This invention enables in-situ underwater detection of the BOD value of the water body, avoiding the influence of long-distance transportation, sample storage, and ambient temperature on the test results.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, and in particular to a device for accurate underwater in-situ testing of BOD. Background Technology

[0002] Biochemical oxygen demand (BOD) reflects the level of organic matter in water that can be utilized by microorganisms, and plays a crucial guiding role in carbon emission monitoring and wastewater resource recovery. Real-time online BOD indicators can help improve wastewater resource recovery efficiency and enhance environmental supervision. However, the traditional five-day respiration method for BOD testing requires five days, is cumbersome, and is affected by many factors, hindering the application of BOD indicators in production practice.

[0003] Microbial fuel cell (MFC)-based BOD sensors have the potential to achieve real-time online BOD sensing, making them a hot research topic. Compared to MFCs, microbial electrolysis cells (MECs), as another typical structure of microbial electrochemistry, offer better opportunities for long-term stable testing of BOD indicators. However, existing MFC or MEC sensing devices have various shortcomings, and there is no integrated, stable, and reliable accurate BOD testing device on the market. Remote sampling automated detection equipment also makes the sensing elements susceptible to the influence of transmission pipelines, ambient temperature, etc., failing to reflect the true BOD information of the water body.

[0004] In summary, the development of an integrated device based on a microbial electrolysis chamber that can perform in-situ automated detection and periodically provide accurate BOD values ​​is of great significance to water treatment, water environment monitoring and other related fields. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater in-situ accurate BOD testing device to solve the problems existing in the prior art, and to provide an integrated, in-situ automated BOD testing device.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides an underwater in-situ precision testing device for BOD, comprising: an underwater probe and an above-water support device. The underwater probe includes a water pump and a microbial electrolysis chamber. The water pump can pump water into the microbial electrolysis chamber for BOD detection. The microbial electrolysis chamber can transmit the BOD detection data to the above-water support device for display. The water pump can also pump the water after BOD detection out.

[0008] Preferably, it also includes an underwater electrical control equipment box and an integrated circuit board. The underwater electrical control equipment box forms a water-proof space, and the integrated circuit board is disposed in the water-proof space. The surface support equipment is connected to the integrated circuit board through a waterproof cable, and the integrated circuit board is connected to the microbial electrolysis chamber and the water pump.

[0009] Preferably, the underwater electrical control equipment box is also equipped with a humidity circuit breaker alarm.

[0010] Preferably, the microbial electrolysis chamber includes an electrolysis cavity and an anode and a cathode disposed inside the electrolysis cavity, with a porous insulating septum disposed between the anode and the cathode.

[0011] Preferably, the anode is made of woven carbon fiber, the cathode is a rhomboid inclined titanium alloy mesh, and the anode, the porous insulating spacer and the cathode are nested from the inside to the outside.

[0012] Preferably, the aquatic support equipment is capable of controlling the water pump and the microbial electrolysis chamber to perform periodic tests, and the water pump includes an inlet pump and an outlet pump.

[0013] Preferably, the integrated circuit board is connected to the water support equipment via a four-core cable;

[0014] The integrated circuit board is connected to the anode and cathode of the microbial electrolysis chamber via a two-core cable to form a circuit, providing DC voltage to the cathode and anode, and collecting the current value in the circuit at the same time;

[0015] The integrated circuit board is connected to the water pump via a two-core cable and can control the pump's on / off state and operating direction to change periodically according to a set program, so that the water sample is periodically discharged and enters the microbial electrolysis chamber.

[0016] Preferably, the water pump is a peristaltic pump.

[0017] Preferably, the DC voltage applied to the cathode and anode of the integrated circuit board is above 0.5V, and the resolution of the measurement circuit of the integrated circuit board is at least 10. -6 A.

[0018] Preferably, the surface support equipment is capable of displaying BOD data and test process curves, as well as saving historical BOD data and transmitting BOD data to the user's server in real time.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] 1. This invention can detect the BOD value of the water body under test in situ underwater, avoiding the influence of factors such as long-distance transportation, sample storage, and ambient temperature on the test results.

[0021] 2. This invention can continuously test contaminated water bodies in the range of 2 to 15000 mg / LBOD, with a single test time of less than 2 hours.

[0022] 3. This invention can display BOD test data and test process curves, and can also save historical BOD data or transmit BOD data to the user's server in real time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the underwater probe in the device for precise in-situ underwater BOD testing provided by the present invention.

[0025] Figure 2 A schematic diagram of the structure of the underwater in-situ precise BOD testing device provided by the present invention during application;

[0026] Figure 3 The BOD value and the original current-time curve of the test process;

[0027] In the diagram: 1-Underwater electrical control equipment box; 2-Humidity circuit breaker alarm; 3-Water inlet pump; 4-Integrated circuit board; 5-Sample inlet silicone tube; 6-Bridging accessories; 7-Water inlet; 8-Microbial electrolysis chamber; 9-Water outlet; 10-Anode; 11-Cathode; 12-Aquatic support equipment; 13-Water body to be tested; 14-Underwater probe. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The purpose of this invention is to provide an underwater in-situ accurate BOD testing device to solve the problems existing in the prior art, and to provide an integrated, in-situ automated BOD testing device.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] This invention provides a device for precise underwater in-situ testing of BOD, such as... Figures 1-2 As shown, it includes: an underwater probe 14 and an above-water support device 12. The underwater probe 14 includes a water pump and a microbial electrolysis chamber 8. The water pump can pump water into the microbial electrolysis chamber 8 for BOD detection. The microbial electrolysis chamber 8 can transmit the BOD detection data to the above-water support device 12 for display. The water pump can also pump the water after BOD detection out.

[0032] The water pump includes an inlet pump 3 and an outlet pump. The inlet pump 3 is used to pump water into the microbial electrolysis chamber 8, and the outlet pump is used to pump water out of the microbial electrolysis chamber 8. The outlet pump is set with respect to the outlet, and the inlet pump 3 is set with respect to the inlet. Of course, a single bidirectional water pump can also be used, in which case only one inlet and one outlet need to be opened on the microbial electrolysis chamber 8.

[0033] The inlet pump 3 and the outlet pump are peristaltic pumps, specifically miniature peristaltic pumps. Preferably, the miniature peristaltic pump controls the water flow rate at around 40 mL / min, shortening the time required to replace the electrolyte while avoiding negative impacts on the stability of the microbial electrolysis chamber 8.

[0034] In use, the underwater probe 14 is placed in the water body 13 to be tested, and the water pump is controlled to pump the water body into the microbial electrolysis chamber 8 for testing. Before the next test, the water body that was tested last time is pumped out of the microbial electrolysis chamber 8 by the water pump, and new water body is pumped in again for the next test.

[0035] The water support equipment 12 can control the water pump and the microbial electrolysis chamber 8 to perform periodic tests, for example, once every two hours.

[0036] In some embodiments, the device for underwater in-situ precise testing of BOD also includes an underwater electrical control equipment box 1 and an integrated circuit board 4. A water-proof space is formed inside the underwater electrical control equipment box 1, and the integrated circuit board 4 is disposed in the water-proof space. The surface support equipment 12 is connected to the integrated circuit board 4 through a waterproof cable. The integrated circuit board 4 is connected to the microbial electrolysis chamber 8 and the water pumps (inlet pump 3 and outlet pump).

[0037] The integrated circuit board 4 is connected to the water support equipment 12 via a four-core cable.

[0038] The integrated circuit board 4 is connected to the anode 10 and cathode 11 of the microbial electrolysis chamber 8 through a two-core cable to form a circuit, providing DC voltage to the cathode 11 and anode 10, while collecting the current value in the circuit.

[0039] Anode 10 and cathode 11 were ultrasonically treated with acetone, ethanol, and deionized water. Specifically, they were soaked in acetone for 12 hours, ultrasonicated with ethanol for 30 minutes, and repeated three times, with fresh ethanol each time. Finally, they were ultrasonicated with deionized water for 30 minutes, and repeated three times, with fresh deionized water each time.

[0040] The DC voltage applied to the cathode 11 and anode 10 by the integrated circuit board 4 is above 0.7V, and the resolution of the measurement circuit of the integrated circuit board 4 is at least 10. -6 A.

[0041] The integrated circuit board 4 is connected to the water pump via a two-core cable and can control the water pump's on / off state and rotation direction to change periodically according to a set program, so that the water sample is periodically discharged and enters the microbial electrolysis chamber 8.

[0042] In some embodiments, the underwater electrical control equipment box 1 is also equipped with a humidity circuit breaker alarm 2. When the humidity circuit breaker alarm 2 detects that the humidity in the watertight space reaches the set threshold, it controls the cable to perform circuit breaker protection and issues an alarm signal.

[0043] In some embodiments, the microbial electrolysis chamber 8 includes an electrolysis cavity and an anode 10 and a cathode 11 disposed inside the electrolysis cavity. A porous insulating spacer is disposed between the anode 10 and the cathode 11 to prevent them from contacting and short-circuiting.

[0044] In some embodiments, the anode 10 is made of woven carbon fiber, and the cathode 11 is a diamond-shaped inclined titanium alloy mesh. The anode 10, the porous insulating spacer and the cathode 11 are nested from the inside to the outside.

[0045] In some embodiments, the water support device 12 can display BOD data and test process curves, save historical BOD data, and transmit BOD data to the user's server in real time.

[0046] When the microbial electrolysis chamber 8 is working, the water body 13 to be tested is contained in the electrolysis chamber as the electrolyte. The electrolyte is periodically renewed with the periodic operation of the micro peristaltic pump. After the electrolyte is renewed, the anode 10 and the cathode 11 will continuously output characteristic electrical signal data. By extracting the characteristic values ​​of the electrical signals and calculating the integral of the electrical signals with respect to time, the BOD value is automatically calculated periodically.

[0047] Implementation Case 1: Using the underwater in-situ precise BOD testing device provided in the above embodiments to test the influent of the biological treatment section of a wastewater treatment plant.

[0048] In conjunction with the aforementioned scheme, an underwater probe 14 is placed in the overflow pipe of the flotation tank outlet, 2 to 3 meters below the water surface. An above-water support device 12 is installed at a suitable position next to the water body 13 to be tested, and the underwater part is connected to the above-water support device 12 with the provided data and power lines.

[0049] Provide 220V AC power to the surface support equipment 12, turn on the test switch, and after 24 hours of stabilization, the measured BOD value and the raw current-time curve of the test process can be obtained every 30 minutes on the visualization interface of the support equipment. The results are as follows: Figure 3 As shown, the BOD data for three consecutive tests were 1024 mg / L, 1086 mg / L, and 1150 mg / L, respectively. The error between these values ​​and the results of the national standard five-day respiratory method test (1000 mg / L, 1020 mg / L, and 1080 mg / L) was less than 10%. The relevant data can be stored in the water support equipment 12.

[0050] Implementation Case 2: Using the underwater in-situ precise BOD testing device provided in the above embodiments to conduct in-situ testing of the effluent from the biological treatment section of a wastewater treatment plant.

[0051] This embodiment provides a method for testing the effluent from the biological treatment section of a wastewater treatment plant. The difference between this method and Embodiment 1 is that the installation location is in the clarification tank at the end of the biological treatment tank, the hydraulic conditions and pipelines are significantly different, and the BOD content of the water is lower.

[0052] Based on the characteristics of the water body 13, such as long hydraulic retention time and low BOD concentration, the single test time was adjusted to 15 minutes. The BOD concentration of the effluent from the biological treatment tank was updated every 15 minutes, and the test data was uploaded to the cloud data server set up by the water plant, which can be viewed remotely at any time.

[0053] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for precise underwater in-situ testing of BOD, characterized in that: include: The system includes an underwater probe and surface support equipment. The underwater probe comprises a water pump and a microbial electrolysis chamber. The water pump pumps water into the microbial electrolysis chamber for BOD detection. The microbial electrolysis chamber transmits the BOD detection data to the surface support equipment for display. The water pump also pumps the BOD-detected water out of the system. The system also includes an underwater electrical control device box and an integrated circuit board. The underwater electrical control device box forms a water-proof space, and the integrated circuit board is disposed within the water-proof space. The surface support equipment is connected to the integrated circuit board via a waterproof cable. The integrated circuit board is connected to the microbial electrolysis chamber and the water pump. The microbial electrolysis chamber includes an electrolysis cavity and a... A porous insulating spacer is provided between the anode and cathode inside the electrolysis chamber; the water support equipment can control the water pump and the microbial electrolysis chamber to perform periodic tests, the water pump includes an inlet pump and an outlet pump; the integrated circuit board is connected to the water support equipment via a four-core cable; the integrated circuit board is connected to the anode and cathode of the microbial electrolysis chamber via a two-core cable to form a circuit, providing DC voltage to the cathode and anode, and collecting the current value in the circuit; the integrated circuit board is connected to the water pump via a two-core cable and can control the water pump's on / off state and operating direction to change periodically according to a set program, so that the water sample is periodically discharged and enters the microbial electrolysis chamber.

2. The device for precise underwater in-situ testing of BOD according to claim 1, characterized in that: The underwater electrical control equipment box is also equipped with a humidity circuit breaker alarm.

3. The device for precise underwater in-situ testing of BOD according to claim 1, characterized in that: The anode is made of woven carbon fiber, and the cathode is a diamond-shaped inclined titanium alloy mesh. The anode, the porous insulating septum, and the cathode are nested from the inside out.

4. The device for precise underwater in-situ testing of BOD according to claim 1, characterized in that: The water pump is a peristaltic pump.

5. The device for precise underwater in-situ testing of BOD according to claim 1, characterized in that: The DC voltage applied to the cathode and anode of the integrated circuit board is above 0.5V, and the resolution of the measurement circuit of the integrated circuit board is at least 10. -6 A.

6. The apparatus for precise underwater in-situ testing of BOD according to claim 1, characterized in that: The above-water support equipment can display BOD data and test process curves, save historical BOD data, and transmit BOD data to the user's server in real time.

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