An online BOD monitoring device and method applicable to the outdoors

Abstract

The present invention discloses an online BOD monitoring device applicable to the outdoors, which includes a multi-way valve. The multi-way valve is respectively connected to 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 to two switching ends of a first switching valve. The fixed end of a second switching valve and a sixth container are respectively connected to two switching ends of the second switching valve. The fixed end of the second switching valve is connected to the liquid inlet of a BOD rapid detector. The water sample is connected to the inlet end of a submersible pump, and the outlet end of the submersible pump is communicated with the water storage tank through a filter. The present invention also discloses an online BOD monitoring method applicable to the outdoors. The present invention can achieve full-automatic online monitoring, solves the dilution problems of the sample liquid and the standard liquid, and can automatically dilute the sample liquid and the standard liquid. It can operate online outdoors for a long time, and the detection indexes can be expanded according to requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent substation inspection methods, and specifically relates to an on-line BOD monitoring device that can be used outdoors, and also relates to an on-line BOD monitoring method that can be used outdoors. Background Art

[0002] BOD is an important indicator for evaluating water pollution and water environment. At present, the detection of BOD indicators mainly includes the five-day incubation method and the microbial membrane method. The BOD5 method is relatively traditional, and this traditional BOD5 determination method has serious defects: it needs to be incubated at a constant temperature of 20 °C for 5 days, with a large workload, cumbersome operation, many interference factors, poor repeatability, large errors, requires quite high specialized training, and cannot reflect the water quality change situation in a timely manner. The microbial membrane method is another relatively mainstream detection method at present. Based on the microbial membrane method, some manufacturers have developed corresponding laboratory rapid detection instruments on the market. The rapid detection instrument based on the microbial membrane method can solve the problems of long detection time and cumbersome work in the BOD five-day incubation method, but the rapid detection instrument based on the microbial membrane method still cannot meet the requirements of on-line BOD detection outdoors. Due to the particularity of the BOD indicator, there is currently no on-line monitoring equipment. The main reasons can be summarized as follows:

[0003] BOD detection must involve microorganisms in the reaction, and the activity of the microorganisms is variable, so calibration needs to be carried out at regular intervals. The conventional standard solution of BOD is also unstable and needs to be prepared and used immediately.

[0004] For high-concentration BOD samples to be measured, dilution is required before measurement, and the dilution factor needs to be determined in advance.

[0005] Therefore, in the process of BOD detection, there are many places that need to be realized by manual operation with the current methods and equipment, resulting in no on-line BOD detection equipment on the market.

[0006] In addition to the above microbial sensor methods, there are also methods such as using microbial reactors, mediator methods, and microbial fuel cells to rapidly measure BOD. The scientific purpose of these methods is to solve the core problems such as few microorganisms, single species, low degradation efficiency of organic matter, high selectivity, and poor environmental adaptability, and then hope to obtain test results more consistent with BOD5. Although a series of progress has been made in the scientific exploration of these methods, some new problems that do not exist in the sensor method have emerged. Therefore, they have not been promoted in the market. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide an online BOD monitoring device that can be used outdoors, and also provide an online BOD monitoring method that can be used outdoors. To achieve automated BOD detection and solve the problem of online monitoring of BOD.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is:

[0009] An online BOD monitoring device that can be used outdoors, including a multi-way valve, the multi-way valve is respectively connected to 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 to two switching ends of a first switching valve. The fixed end of a second switching valve and a sixth container are respectively connected to two switching ends of the second switching valve. The fixed end of the second switching valve is connected to the liquid inlet of a BOD rapid detector. The water sample is connected to the inlet end of a submersible pump, and the outlet end of the submersible pump is communicated with the water storage tank through a filter.

[0010] As described above, the water storage tank is connected to a drain port through a first control valve. Two switching ends of a third switching valve are respectively connected to the drain port and the sixth container, and the fixed end of the third switching valve is connected to the liquid discharge port of the BOD rapid detector.

[0011] As described above, the mesh number of the filter is 20 mesh to 100 mesh.

[0012] As described above, the cleaning solution is a phosphate solution.

[0013] An online BOD monitoring method that can be used outdoors, including the following steps:

[0014] Step 1: The submersible pump pumps the water sample into the water storage tank, and the water sample is left standing in the water storage tank for 5 - 30 minutes;

[0015] Step 2: Control the multi-way valve to conduct the injection pump and the first container. The injection pump extracts a certain amount of calibration solution. Control the multi-way valve to conduct the injection pump and the fourth container, and the injection pump injects the extracted calibration solution into the fourth container. Control the multi-way valve to conduct the injection pump and the second container, the injection pump extracts a certain amount of buffer solution. Control the multi-way valve to conduct the injection pump and the fourth container, and inject the extracted buffer solution into the fourth container. Control the multi-way valve to conduct the injection pump and the third container, the injection pump extracts a certain amount of clean water. Control the multi-way valve to conduct the injection pump and the fourth container, and inject the clean water into the fourth container. Air injection and stirring step: Control the multi-way valve to conduct the seventh container and the injection pump, extract air, control the multi-way valve to conduct the injection pump and the fourth container, and inject the air into the fourth container. Repeat the air injection and stirring step several times;

[0016] Step 3: By switching the first switching valve and the second switching valve, the fourth container is made to communicate with the liquid inlet of the BOD rapid detector, and the BOD rapid detector extracts the standard solution from the fourth container for calibration work;

[0017] Step 4: Control the multi-way valve to connect the syringe pump and the storage tank. The syringe pump extracts a certain amount of sample solution, then control the multi-way valve to connect the syringe pump and the fifth container, and the syringe pump injects the extracted sample solution into the fifth container. Control the multi-way valve to connect the syringe pump and the second container, the syringe pump extracts a certain amount of buffer solution, control the multi-way valve to connect the syringe pump and the fifth container, and inject the extracted buffer solution into the fifth container. Control the multi-way valve to connect the syringe pump and the third container, the syringe pump extracts a certain amount of clean water, control the multi-way valve to connect the syringe pump and the fifth container, and inject the clean water into the fifth container. Air injection and stirring step: Control the multi-way valve to connect the seventh container and the syringe pump to extract air, control the multi-way valve to connect the syringe pump and the fifth container, and inject the air into the fifth container. Repeat the air injection and stirring step several times;

[0018] Step 5: Switch the first switching valve and the second switching valve to make the fifth container communicate with the liquid inlet of the BOD rapid detector, and the BOD rapid detector extracts the sample solution from the fifth container for measurement work.

[0019] An online BOD monitoring method applicable to the outdoors further includes a pipeline cleaning step: Except for the extraction and injection of clean water from the third container by the syringe pump, and the extraction and injection of air from the seventh container by the syringe pump, after each extraction and injection by the syringe pump, control the multi-way valve to connect the third container and the syringe pump to extract clean water, and then control the multi-way valve to connect the syringe pump and the seventh container to discharge the water extracted by the syringe pump into the seventh container.

[0020] An online BOD monitoring method applicable to the outdoors further includes a BOD rapid detector cleaning step: After the measurement or calibration is completed, switch the second switching valve to make the sixth container communicate with the liquid inlet of the BOD rapid detector, switch the third switching valve to make the liquid discharge port of the BOD rapid detector communicate with the discharge port, the BOD rapid detector extracts the cleaning solution in the sixth container for cleaning, and the cleaned cleaning solution is discharged to the discharge port. After several minutes, switch the third switching valve to make the liquid discharge port of the BOD rapid detector communicate with the sixth container, and continuously operate to make the cleaning solution circulate in the BOD rapid detector until the next measurement or calibration.

[0021] The present invention has the following beneficial effects compared with the prior art:

[0022] 1. There is no online BOD monitoring equipment on the market, and this device can achieve full-automatic online monitoring.

[0023] 2. The present invention solves the problem of dilution of the sample solution and the standard solution, and can automatically dilute the sample solution and the standard solution.

[0024] 3. The present invention can operate online outdoors for a long time, and the detection indicators can be expanded according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic structural diagram of the present invention.

[0026] DETAILED IMPLEMENTATION

[0027] For the convenience of those of ordinary skill in the art to understand and implement the present invention, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Embodiment 1:

[0029] An online BOD monitoring device that can be used outdoors includes a multi-way valve, which is respectively connected to 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 to two switching ends of a first switching valve. The fixed end of a second switching valve and a sixth container are respectively connected to two switching ends of the second switching valve. The fixed end of the second switching valve is connected to the liquid inlet of a BOD rapid detector. The water sample is connected to the inlet end of a submersible pump, and the outlet end of the submersible pump is communicated with the water storage tank through a filter.

[0030] The first connection end, the second connection end, the third connection end, the fourth connection end, the fifth connection end, the sixth connection end, the seventh connection end, and the eighth connection end of the multi-way valve are respectively connected to 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. The multi-way valve can realize the communication between the first connection end and the second connection end, the third connection end, the fourth connection end, the fifth connection end, the sixth connection end, the seventh connection end, and the eighth connection end respectively.

[0031] The first switching valve can realize the communication between one of the switching ends and the fixed end, and the second switching valve can realize the communication between one of the switching ends and the fixed end.

[0032] The water storage tank is connected to the drain port through a first control valve. Two switching ends of a third switching valve are respectively connected to the drain port and the sixth container, and the fixed end of the third switching valve is connected to the liquid drain port of the BOD rapid detector.

[0033] The third switching valve can realize the communication between one of the switching ends and the fixed end.

[0034] The mesh number of the filter is 20 to 100 meshes.

[0035] The cleaning liquid is a phosphate solution.

[0036] The model of the BOD rapid detector can be BOD-220B.

[0037] An online BOD monitoring method applicable to the outdoors, using the above-mentioned online BOD monitoring device applicable to the outdoors, includes the following steps:

[0038] Step 1: Water sampling. The submersible pump works to pump out the water in the water sample, and the water sample enters the storage tank through the filter. The water sample is left standing in the storage tank for 5 - 30 minutes.

[0039] Step 2: Standard solution dilution. Control the multi-way valve to connect the syringe pump with the first container. The syringe pump extracts a certain amount of calibration solution (ranging from 0.2 to 1 ml). Then control the multi-way valve to connect the syringe pump with the fourth container, and the syringe pump injects the previously extracted calibration solution into the fourth container. Control the multi-way valve to connect the syringe pump with the second container, the syringe pump extracts a certain amount of buffer solution (ranging from 1 to 10 ml). Control the multi-way valve to connect the syringe pump with the fourth container and inject the extracted buffer solution into the fourth container. Control the multi-way valve to connect the syringe pump with the third container, the syringe pump extracts a certain amount of clear water (ranging from 10 ml to 50 ml). Control the multi-way valve to connect the syringe pump with the fourth container and inject the clear water into the fourth container. Air injection and stirring step: Control the multi-way valve to connect the seventh container with the syringe pump to extract air. The seventh container is an open container used to receive waste liquid and provide air for the syringe pump to inhale. Control the multi-way valve to connect the syringe pump with the fourth container and inject air into the fourth container. Repeat the air injection and stirring step several times to stir and mix the solution. The available model of the multi-way valve is SV-06.

[0040] Step 3: Calibration of the BOD rapid detector. Through the switching of the first switching valve and the second switching valve, connect the fourth container with the liquid inlet of the BOD rapid detector. The BOD rapid detector extracts the standard solution from the fourth container for calibration work.

[0041] Step 4: Dilution of the sample solution. The multi-way valve can connect any path other than the syringe pump to the syringe pump. Through the connection of the multi-way valve and the "withdrawal" and "injection" operations of the syringe pump, the liquid transfer of any container can be achieved. Control the multi-way valve to connect the syringe pump to the water storage tank. The syringe pump withdraws a certain amount of sample solution (ranging from 0.2 to 1 ml), then control the multi-way valve to connect the syringe pump to the fifth container, and the syringe pump injects the previously withdrawn sample solution into the fifth container. Control the multi-way valve to connect the syringe pump to the second container, the syringe pump withdraws a certain amount of buffer solution (ranging from 1 to 10 ml), control the multi-way valve to connect the syringe pump to the fifth container, and inject the withdrawn buffer solution into the fifth container. Control the multi-way valve to connect the syringe pump to the third container, the syringe pump withdraws a certain amount of clean water (ranging from 10 ml to 50 ml), control the multi-way valve to connect the syringe pump to the fifth container, and inject the clean water into the fifth container. Air injection and stirring step: Control the multi-way valve to connect the seventh container to the syringe pump, withdraw air, control the multi-way valve to connect the syringe pump to the fifth container, and inject the air into the fifth container. Repeat the air injection and stirring step several times to stir and mix the solution. The sample solution is withdrawn from the water storage tank, and the volume ratio of the withdrawn clean water to the withdrawn sample solution is between 0 and 100 times.

[0042] Step 5: Determination of the sample solution by the BOD rapid detector. Through the switching of the first switching valve and the second switching valve, the fifth container is connected to the liquid inlet of the BOD rapid detector, and the BOD rapid detector withdraws the sample solution from the fifth container for determination.

[0043] Pipeline cleaning. After each withdrawal and injection of the syringe pump (except for the withdrawal and injection of clean water from the third container by the syringe pump and the withdrawal and injection of air from the seventh container by the syringe pump), control the multi-way valve to connect the third container to the syringe pump, withdraw clean water, and then control the multi-way valve to connect the syringe pump and the seventh container, and discharge the water withdrawn by the syringe pump into the seventh container to clean the pipelines that have passed through in the previous steps respectively.

[0044] Cleaning of the BOD rapid detector. After the determination or calibration is completed, switch the second switching valve to connect the sixth container to the liquid inlet of the BOD rapid detector, switch the third switching valve to connect the liquid discharge port of the BOD rapid detector to the discharge port, the BOD rapid detector withdraws the cleaning liquid in the sixth container for cleaning, and the cleaned cleaning liquid is discharged to the discharge port. After several minutes (5 - 20 min), switch the third switching valve to connect the liquid discharge port of the BOD rapid detector to the sixth container, and continuously operate to make the cleaning liquid circulate in the BOD rapid detector until the next determination or calibration. The third switching valve is a switching valve used to switch and control the connection between the liquid discharge port of the BOD rapid detector and the discharge port, or to switch and control the connection between the liquid discharge port of the BOD rapid detector and the sixth container.

[0045] The waste liquid is discharged. The multi-way valve is controlled to connect the syringe pump and the fourth container to extract the excess standard solution. The multi-way valve is controlled to connect the syringe pump and the seventh container to discharge the standard solution into the seventh container. The multi-way valve is controlled to connect the syringe pump and the fifth container to extract the excess sample solution. The multi-way valve is controlled to connect the syringe pump and the seventh container to discharge the sample solution into the seventh container.

[0046] For the drainage process, after the measurement or calibration and the waste liquid discharge are completed, the first control valve is opened to connect the water storage tank and the drain port, and the water in the water storage tank is discharged by gravity flow.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An online BOD monitoring method applicable to the outdoors, characterized in that, An online BOD monitoring device that can be used outdoors includes a multi-way valve. The multi-way valve is respectively connected to 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 to two switching ends of a first switching valve. The fixed end of the first switching valve and a sixth container are respectively connected to two switching ends of a second switching valve. The fixed end of the second switching valve is connected to the liquid inlet of a BOD rapid detector. The water sample is connected to the inlet end of a submersible pump. The outlet end of the submersible pump is communicated with the water storage tank through a filter. The water storage tank is connected to a drain port through a first control valve. Two switching ends of a third switching valve are respectively connected to the drain port and the sixth container. The fixed end of the third switching valve is connected to the liquid discharge port of the BOD rapid detector. The above method includes the following steps: Step 1: The submersible pump pumps the water sample into the water storage tank, and the water sample is allowed to stand in the water storage tank for 5 - 30 minutes. Step 2: Control the multi-way valve to connect the injection pump to the first container. The injection pump extracts a certain amount of calibration solution. Control the multi-way valve to connect the injection pump to the fourth container, and the injection pump injects the extracted calibration solution into the fourth container. Control the multi-way valve to connect the injection pump to the second container. The injection pump extracts a certain amount of buffer solution. Control the multi-way valve to connect the injection pump to the fourth container and inject the extracted buffer solution into the fourth container. Control the multi-way valve to connect the injection pump to the third container. The injection pump extracts a certain amount of clean water. Control the multi-way valve to connect the injection pump to the fourth container and inject the clean water into the fourth container. Air injection and stirring step: Control the multi-way valve to connect the seventh container to the injection pump to extract air. Control the multi-way valve to connect the injection pump to the fourth container and inject the air into the fourth container. Repeat the air injection and stirring step several times. Step 3: By switching the first switching valve and the second switching valve, make the fourth container communicate with the liquid inlet of the BOD rapid detector. The BOD rapid detector extracts the calibration solution from the fourth container for calibration work. Step 4: Control the multi-way valve to connect the injection pump to the water storage tank. The injection pump extracts a certain amount of sample solution. Then control the multi-way valve to connect the injection pump to the fifth container, and the injection pump injects the extracted sample solution into the fifth container. Control the multi-way valve to connect the injection pump to the second container. The injection pump extracts a certain amount of buffer solution. Control the multi-way valve to connect the injection pump to the fifth container and inject the extracted buffer solution into the fifth container. Control the multi-way valve to connect the injection pump to the third container. The injection pump extracts a certain amount of clean water. Control the multi-way valve to connect the injection pump to the fifth container and inject the clean water into the fifth container. Air injection and stirring step: Control the multi-way valve to connect the seventh container to the injection pump to extract air. Control the multi-way valve to connect the injection pump to the fifth container and inject the air into the fifth container. Repeat the air injection and stirring step several times. Step 5: Switch the first switching valve and the second switching valve to make the fifth container communicate with the liquid inlet of the BOD rapid detector. The BOD rapid detector extracts the sample solution from the fifth container for measurement work.

2. The online BOD monitoring method applicable to the outdoors according to claim 1, wherein, It further includes a pipeline cleaning step: Except for the extraction and injection of clear water in the third container by the injection pump, and the extraction and injection of air in the seventh container by the injection pump, after each extraction and injection by the injection pump, control the multi-way valve to connect the third container and the injection pump, extract clear water, and then control the multi-way valve to connect the injection pump and the seventh container, and discharge the water extracted by the injection pump into the seventh container.

3. The on-line BOD monitoring method applicable to the outdoors according to claim 1, characterized in that, It further includes a BOD rapid detector cleaning step: After the determination or calibration is completed, switch the second switching valve to connect the sixth container with the liquid inlet of the BOD rapid detector, and switch the third switching valve to connect the liquid discharge port of the BOD rapid detector with the discharge port. The BOD rapid detector extracts the cleaning liquid in the sixth container for cleaning, and the cleaned cleaning liquid is discharged to the discharge port. After several minutes, switch the third switching valve to connect the liquid discharge port of the BOD rapid detector with the sixth container, and continuously operate to make the cleaning liquid circulate in the BOD rapid detector until the next determination or calibration.

4. An online BOD monitoring method applicable to the outdoors according to claim 1, characterized in that, The mesh number of the described filter is 20 mesh to 100 mesh.

5. The on-line BOD monitoring method applicable to the outdoors according to claim 3, characterized in that, The described cleaning liquid is a phosphate solution.

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