CN111796067A - Online BOD monitoring device and method capable of being used outdoors - Google Patents
Online BOD monitoring device and method capable of being used outdoors Download PDFInfo
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- CN111796067A CN111796067A CN202010612977.4A CN202010612977A CN111796067A CN 111796067 A CN111796067 A CN 111796067A CN 202010612977 A CN202010612977 A CN 202010612977A CN 111796067 A CN111796067 A CN 111796067A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012806 monitoring device Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 112
- 239000007924 injection Substances 0.000 claims abstract description 112
- 239000007788 liquid Substances 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims description 21
- 239000000872 buffer Substances 0.000 claims description 10
- 239000000284 extract Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 238000012031 short term test Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000010790 dilution Methods 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 21
- 230000000813 microbial effect Effects 0.000 description 7
- 239000012086 standard solution Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000007853 buffer solution Substances 0.000 description 2
- 238000012136 culture method Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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Abstract
The invention discloses an outdoor online BOD monitoring device, which comprises a multi-way valve, wherein the multi-way valve is respectively connected with an injection pump, a seventh container, a fourth container, a fifth container, a water storage tank, a first container, a second container and a third container, the fourth container and the fifth container are respectively connected with two switching ends of a first switching valve, a fixed end of the second switching valve and a sixth container are respectively connected with two switching ends of the second switching valve, a fixed end of the second switching valve is connected with a liquid inlet of a BOD rapid detector, a water sample is connected with an inlet end of a submersible pump, and an outlet end of the submersible pump is communicated with the water storage tank through a filter. The invention also discloses an outdoor online BOD monitoring method, and the invention can realize full-automatic online monitoring. The problem of dilution of the sample liquid and the standard liquid is solved, and the sample liquid and the standard liquid can be automatically diluted. The device can be operated outdoors for a long time on line, and the detection index can be expanded according to the requirement.
Description
Technical Field
The invention belongs to the technical field of intelligent substation inspection methods, and particularly relates to an outdoor online BOD monitoring device and an outdoor online BOD monitoring method.
Background
BOD is an important index for water environment pollution evaluation, and the BOD index is mainly detected by a five-day culture method and a microbial membrane method at present. BOD5The method is more conventional, and the conventional BOD5The assay has serious drawbacks: the culture needs to be carried out for 5 days under the constant temperature condition of 20 ℃, the workload is large, the operation is complicated, the number of interference factors is large, the repeatability is poor, large errors exist, special training is quite high in requirement, and the change condition of the water quality cannot be reflected in time. The microbial film method is another mainstream detection method at present, and corresponding laboratory rapid detection instruments are developed according to the existing part of manufacturers on the market of the microbial film method at present. The microbial membrane method rapid detection instrument can solve the problems of long time consumption and complex work of BOD five-day culture method detection, but the microbial membrane method rapid detection instrument still cannot meet the requirement of outdoor BOD online detection. Due to the particularity of the BOD index, there is no online monitoring device at present, and the following reasons can mainly be summarized:
the BOD detection must have microorganisms to participate in the reaction, the activity of the two microorganisms is changed, so the calibration is needed at intervals, and the conventional BOD standard solution is not stable and needs to be prepared for use.
The high-concentration BOD sample solution to be measured needs to be diluted before measurement, and the dilution times need to be judged in advance.
Therefore, the existing methods and devices in the BOD detection process have many places which need manual operation to realize, so that no online BOD detection device is available in the market.
In addition to the above-described biosensor method, BOD is also rapidly measured by using a method such as a microbial reactor, a mediator method, a microbial fuel cell, or the like. The scientific aim of the methods is to solve the core problems of small quantity of microorganisms, single type, low degradation efficiency on organic matters, high selectivity, poor environmental adaptability and the like, and further hope to obtain a test result more consistent with BOD 5. The scientific exploration of these methods has made a series of advances, but has brought some new problems that the sensor method has not. So that the method is not popularized in the market.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an outdoor online BOD monitoring device and an outdoor online BOD monitoring method. Realize automatic BOD detection, solve BOD's on-line monitoring problem.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a can be used to open air online BOD monitoring devices, including the multi-way valve, the multi-way valve respectively with the syringe pump, the seventh container, the fourth container, the fifth container, the tank, first container, the second container, the third container is connected, fourth container and fifth container are connected with two switching ends of first diverter valve respectively, the stiff end of second diverter valve and sixth container are connected with two switching ends of second diverter valve respectively, the stiff end of second diverter valve is connected with BOD short-term test appearance's inlet, the water sample is connected with the inlet of immersible pump, the play end of immersible pump passes through filter and tank intercommunication.
The water storage tank is connected with the discharge port through the first control valve, two switching ends of the third switching valve are respectively connected with the discharge port and the sixth container, and the fixed end of the third switching valve is connected with the liquid discharge port of the BOD rapid detector.
The mesh number of the filter is 20-100 meshes.
The cleaning solution is a phosphate solution.
An on-line BOD monitoring method applicable to outdoor comprises the following steps:
step 1, pumping a water sample to a water storage tank by using a submersible pump, and standing the water sample in the water storage tank for 5-30 min;
step 2, controlling the multi-way valve to conduct the injection pump and the first container, the injection pump extracts a certain amount of calibration liquid, the multi-way valve is controlled to conduct the injection pump and the fourth container, the injection pump injects the extracted calibration liquid into the fourth container, the multi-way valve is controlled to conduct the injection pump and the second container, the injection pump extracts a certain amount of buffer liquid, the multi-way valve is controlled to conduct the injection pump and the fourth container, the extracted buffer liquid is injected into the fourth container, the multi-way valve is controlled to conduct the injection pump and the third container, the injection pump extracts a certain amount of clear water, the multi-way valve is controlled to conduct the injection pump and the fourth container, the clear water is injected into the fourth container, and the air: controlling the multi-way valve to conduct the seventh container and the injection pump to pump air, controlling the multi-way valve to conduct the injection pump and the fourth container, injecting the air into the fourth container, and repeating the air injection and stirring steps for a plurality of times;
step 3, switching the first switching valve and the second switching valve to enable the fourth container to be communicated with a liquid inlet of the BOD rapid detector, and extracting the standard liquid from the fourth container by the BOD rapid detector to perform calibration work;
step 4, controlling the multi-way valve to conduct the injection pump and the water storage tank, enabling the injection pump to extract a certain amount of sample liquid, then controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the injection pump to inject the extracted sample liquid into the fifth container, controlling the multi-way valve to conduct the injection pump and the second container, enabling the injection pump to extract a certain amount of buffer liquid, controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the extracted buffer liquid to be injected into the fifth container, controlling the multi-way valve to conduct the injection pump and the third container, enabling the injection pump to extract a certain amount of clear water, controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the clear water to be: controlling the multi-way valve to conduct the seventh container and the injection pump to pump air, controlling the multi-way valve to conduct the injection pump and the fifth container, injecting air into the fifth container, and repeating the air injection and stirring steps for a plurality of times;
and 5, switching the first switching valve and the second switching valve to enable the fifth container to be communicated with a liquid inlet of the BOD rapid detector, and extracting the sample liquid from the fifth container by the BOD rapid detector to perform determination work.
An outdoor online BOD monitoring method further comprises the following pipeline cleaning steps: except for the extraction and injection of the clean water of the third container by the injection pump and the extraction and injection of the air of the seventh container by the injection pump, after each extraction and injection of the injection pump, the multi-way valve is controlled to conduct the third container and the injection pump, clean water is extracted, the multi-way valve is controlled to conduct the injection pump and the seventh container, and the water extracted by the injection pump is discharged to the seventh container.
An outdoor online BOD monitoring method further comprises the following steps: after the measurement or calibration is finished, the second switching valve is switched to enable the sixth container to be communicated with the liquid inlet of the BOD rapid detector, the third switching valve is switched to enable the liquid outlet of the BOD rapid detector to be communicated with the liquid outlet, the BOD rapid detector extracts cleaning liquid in the sixth container to be cleaned, the cleaned cleaning liquid is discharged to the liquid outlet, the third switching valve is switched to enable the liquid outlet of the BOD rapid detector to be communicated with the sixth container after the cleaning liquid is continuously used for a plurality of minutes, and the cleaning liquid is continuously circulated in the BOD rapid detector until the next measurement or calibration is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. on-line BOD monitoring equipment is not available in the market, and the device can realize full-automatic on-line monitoring.
2. The invention solves the problem of dilution of the sample liquid and the standard liquid, and can automatically dilute the sample liquid and the standard liquid.
3. The invention can be operated on line outdoors for a long time, and the detection index can be expanded according to the requirement.
Drawings
FIG. 1 is a schematic structural view of the present invention.
Detailed description of the preferred embodiments
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
Example 1:
the utility model provides a can be used to open air online BOD monitoring devices, including the multi-way valve, the multi-way valve respectively with the syringe pump, the seventh container, the fourth container, the fifth container, the tank, first container, the second container, the third container is connected, fourth container and fifth container are connected with two switching ends of first diverter valve respectively, the stiff end of second diverter valve and sixth container are connected with two switching ends of second diverter valve respectively, the stiff end of second diverter valve is connected with BOD short-term test appearance's inlet, the water sample is connected with the inlet of immersible pump, the play end of immersible pump passes through filter and tank intercommunication.
The first connecting end, the second connecting end, the third connecting end, the fourth connecting end, the fifth connecting end, the sixth connecting end, the seventh connecting end and the eighth connecting end of the multi-way valve are respectively connected with the injection pump, the seventh container, the fourth container, the fifth container, the water storage tank, the first container, the second container and the third container, and the first connecting end can be respectively communicated with the second connecting end, the third connecting end, the fourth connecting end, the fifth connecting end, the sixth connecting end, the seventh connecting end and the eighth connecting end through the multi-way valve.
The first switching valve can realize that one of them switching end communicates with the stiff end, and the second switching valve can realize that one of them switching end communicates with the stiff end.
The reservoir is connected with the drain through a first control valve, two switching ends of the third switching valve are respectively connected with the drain and a sixth container, and the fixed end of the third switching valve is connected with a liquid discharge port of the BOD rapid detector.
The third switching valve can realize that one of the switching ends is communicated with the fixed end.
The mesh number of the filter is 20-100 meshes.
The cleaning solution is phosphate solution.
The BOD rapid detector can adopt BOD-220B.
An outdoor online BOD monitoring method, which utilizes the outdoor online BOD monitoring device, comprises the following steps:
step 1, taking water, pumping out water in a water sample by the operation of a submersible pump, and enabling the water sample to enter a water storage tank through a filter. And standing the water sample in a water storage tank for 5-30 min.
Step 2, diluting a standard solution, controlling a multi-way valve to conduct an injection pump and a first container, pumping a certain amount of the standard solution (0.2-1 ml unequal) by the injection pump, controlling the multi-way valve to conduct the injection pump and a fourth container, injecting the previously pumped standard solution into the fourth container by the injection pump, controlling the multi-way valve to conduct the injection pump and the second container, pumping a certain amount of buffer solution (1-10 ml unequal) by the injection pump, controlling the multi-way valve to conduct the injection pump and the fourth container, injecting the pumped buffer solution into the fourth container, controlling the multi-way valve to conduct the injection pump and the third container, pumping a certain amount of clear water (10 ml-50 ml unequal) by the injection pump, controlling the multi-way valve to conduct the injection pump and the fourth container, injecting the clear water into the fourth container, and injecting air: the control multi-way valve switches on the seventh container and the injection pump to extract air, the seventh container is an open container and is used for receiving waste liquid and providing air for the injection pump to suck, the control multi-way valve switches on the injection pump and the fourth container to inject the air into the fourth container, and the air injection stirring step is repeated for a plurality of times to play a role in stirring and mixing the solution. The multi-way valve may be used with model number SV-06.
And 3, calibrating the BOD rapid detector, conducting the fourth container to be connected with a liquid inlet of the BOD rapid detector through switching of the first switching valve and the second switching valve, and extracting the standard liquid from the fourth container by the BOD rapid detector to perform calibration work.
Step 4, diluting the sample liquid, enabling any path out of the injection pump to be communicated with the injection pump through a multi-way valve, enabling the liquid transfer of any container through the communication of the multi-way valve and the 'extraction' and 'injection' operations of the injection pump, controlling the multi-way valve to communicate the injection pump with a water storage tank, enabling the injection pump to extract a certain amount of sample liquid (0.2-1 ml unequal), then controlling the multi-way valve to communicate the injection pump with a fifth container, enabling the injection pump to inject the sample liquid extracted before into the fifth container, controlling the multi-way valve to communicate the injection pump with a second container, enabling the injection pump to extract a certain amount of buffer liquid (1-10 ml unequal), controlling the multi-way valve to communicate the injection pump with the fifth container, injecting the extracted buffer liquid into the fifth container, controlling the multi-way valve to communicate the injection pump with a third container, enabling the injection pump to extract a certain amount of clear water (10ml, injecting clean water into a fifth container, and injecting air into the fifth container for stirring: and controlling the multi-way valve to conduct the seventh container and the injection pump to extract air, controlling the multi-way valve to conduct the injection pump and the fifth container, injecting the air into the fifth container, and repeating the air injection and stirring steps for a plurality of times to play a role in stirring and mixing the solution. And (3) extracting the sample liquid from the water storage tank, wherein the ratio of the clear water extraction volume to the sample liquid extraction volume is 0-100 times.
And 5, measuring the sample liquid of the BOD rapid detector, communicating the fifth container with a liquid inlet of the BOD rapid detector through switching of the first switching valve and the second switching valve, and extracting the sample liquid from the fifth container by the BOD rapid detector to carry out measurement.
And (2) cleaning a pipeline, wherein after the injection pump extracts and injects water every time (except for extracting and injecting clean water of the third container by the injection pump and extracting and injecting air of the seventh container by the injection pump), the multi-way valve is controlled to conduct the third container and the injection pump, clean water is extracted, the multi-way valve is controlled to conduct the injection pump and the seventh container, water extracted by the injection pump is discharged to the seventh container, and the pipeline which flows through in the previous step is cleaned respectively.
And cleaning the BOD rapid detector, switching the second switching valve after the measurement or calibration is finished to communicate the sixth container with the liquid inlet of the BOD rapid detector, switching the third switching valve to communicate the liquid outlet of the BOD rapid detector with the drain port, extracting the cleaning liquid in the sixth container by the BOD rapid detector for cleaning, discharging the cleaned cleaning liquid to the drain port, switching the third switching valve after the cleaning liquid is continuously used for several minutes (5-20 min), communicating the liquid outlet of the BOD rapid detector with the sixth container, and continuously circulating the cleaning liquid in the BOD rapid detector until the next measurement or calibration. And the third switching valve is a switching valve and is used for switching and controlling the connection of a liquid outlet of the BOD rapid detector and the discharge port, or switching and controlling the connection of the liquid outlet of the BOD rapid detector and the sixth container.
Discharging waste liquid, controlling the multi-way valve to conduct the injection pump and the fourth container, pumping redundant standard liquid, controlling the multi-way valve to conduct the injection pump and the seventh container, and discharging the standard liquid to the seventh container; and controlling the multi-way valve to conduct the injection pump and the fifth container, pumping redundant sample liquid, and controlling the multi-way valve to conduct the injection pump and the seventh container to discharge the sample liquid to the seventh container.
And in the drainage process, after the measurement or calibration and the waste liquid drainage are finished, the first control valve is opened to conduct the water storage tank and the drainage port, and the water in the water storage tank is drained through gravity flow.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a can be used to open air online BOD monitoring devices, including the multi-way valve, a serial communication port, the multi-way valve respectively with the syringe pump, the seventh container, the fourth container, the fifth container, the tank, first container, the second container, the third container is connected, fourth container and fifth container are connected with two switching ends of first diverter valve respectively, the stiff end of second diverter valve and sixth container are connected with two switching ends of second diverter valve respectively, the stiff end of second diverter valve is connected with BOD short-term test appearance's inlet, the water sample is connected with the inlet end of immersible pump, the play end of immersible pump passes through filter and tank intercommunication.
2. The on-line BOD monitoring device as claimed in claim 1, wherein the water storage tank is connected to the drain port through a first control valve, two switching ends of the third switching valve are respectively connected to the drain port and the sixth container, and a fixed end of the third switching valve is connected to the drain port of the BOD rapid detector.
3. The on-line BOD monitoring device as claimed in claim 1, wherein the mesh number of the filter is 20-100.
4. The on-line BOD monitoring device as claimed in claim 1, wherein the cleaning solution is phosphate solution.
5. An outdoor on-line BOD monitoring method, which utilizes the outdoor on-line BOD monitoring device of claim 2, comprising the following steps:
step 1, pumping a water sample to a water storage tank by using a submersible pump, and standing the water sample in the water storage tank for 5-30 min;
step 2, controlling the multi-way valve to conduct the injection pump and the first container, the injection pump extracts a certain amount of calibration liquid, the multi-way valve is controlled to conduct the injection pump and the fourth container, the injection pump injects the extracted calibration liquid into the fourth container, the multi-way valve is controlled to conduct the injection pump and the second container, the injection pump extracts a certain amount of buffer liquid, the multi-way valve is controlled to conduct the injection pump and the fourth container, the extracted buffer liquid is injected into the fourth container, the multi-way valve is controlled to conduct the injection pump and the third container, the injection pump extracts a certain amount of clear water, the multi-way valve is controlled to conduct the injection pump and the fourth container, the clear water is injected into the fourth container, and the air: controlling the multi-way valve to conduct the seventh container and the injection pump to pump air, controlling the multi-way valve to conduct the injection pump and the fourth container, injecting the air into the fourth container, and repeating the air injection and stirring steps for a plurality of times;
step 3, switching the first switching valve and the second switching valve to enable the fourth container to be communicated with a liquid inlet of the BOD rapid detector, and extracting the standard liquid from the fourth container by the BOD rapid detector to perform calibration work;
step 4, controlling the multi-way valve to conduct the injection pump and the water storage tank, enabling the injection pump to extract a certain amount of sample liquid, then controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the injection pump to inject the extracted sample liquid into the fifth container, controlling the multi-way valve to conduct the injection pump and the second container, enabling the injection pump to extract a certain amount of buffer liquid, controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the extracted buffer liquid to be injected into the fifth container, controlling the multi-way valve to conduct the injection pump and the third container, enabling the injection pump to extract a certain amount of clear water, controlling the multi-way valve to conduct the injection pump and the fifth container, enabling the clear water to be: controlling the multi-way valve to conduct the seventh container and the injection pump to pump air, controlling the multi-way valve to conduct the injection pump and the fifth container, injecting air into the fifth container, and repeating the air injection and stirring steps for a plurality of times;
and 5, switching the first switching valve and the second switching valve to enable the fifth container to be communicated with a liquid inlet of the BOD rapid detector, and extracting the sample liquid from the fifth container by the BOD rapid detector to perform determination work.
6. The on-line BOD monitoring method for outdoor use of claim 5, further comprising the step of pipeline cleaning: except for the extraction and injection of the clean water of the third container by the injection pump and the extraction and injection of the air of the seventh container by the injection pump, after each extraction and injection of the injection pump, the multi-way valve is controlled to conduct the third container and the injection pump, clean water is extracted, the multi-way valve is controlled to conduct the injection pump and the seventh container, and the water extracted by the injection pump is discharged to the seventh container.
7. The on-line BOD monitoring method for outdoor use according to claim 5, further comprising a BOD rapid detector cleaning step: after the measurement or calibration is finished, the second switching valve is switched to enable the sixth container to be communicated with the liquid inlet of the BOD rapid detector, the third switching valve is switched to enable the liquid outlet of the BOD rapid detector to be communicated with the liquid outlet, the BOD rapid detector extracts cleaning liquid in the sixth container to be cleaned, the cleaned cleaning liquid is discharged to the liquid outlet, the third switching valve is switched to enable the liquid outlet of the BOD rapid detector to be communicated with the sixth container after the cleaning liquid is continuously used for a plurality of minutes, and the cleaning liquid is continuously circulated in the BOD rapid detector until the next measurement or calibration is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010612977.4A CN111796067A (en) | 2020-06-30 | 2020-06-30 | Online BOD monitoring device and method capable of being used outdoors |
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| CN202010612977.4A CN111796067A (en) | 2020-06-30 | 2020-06-30 | Online BOD monitoring device and method capable of being used outdoors |
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