CN211955227U - Total nitrogen on-line monitoring device - Google Patents
Total nitrogen on-line monitoring device Download PDFInfo
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- CN211955227U CN211955227U CN202020619505.7U CN202020619505U CN211955227U CN 211955227 U CN211955227 U CN 211955227U CN 202020619505 U CN202020619505 U CN 202020619505U CN 211955227 U CN211955227 U CN 211955227U
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Abstract
The utility model discloses a total nitrogen on-line monitoring device, multidirectional selector valve include seven feed liquor valve ports and two play liquid valve ports, and metering device's inlet is connected to one of them liquid valve port through the feed liquor pipeline, and metering device's liquid outlet is connected to through going out liquid pipeline and clears up the bottle, and the peristaltic pump setting is on going out liquid pipeline, clears up the bottle and is connected to one of them feed liquor valve port, other six through flowing back pipeline respectively the feed liquor valve port through pipe connection to the water sample that awaits measuring, be used for the different concentration potassium nitrate standard use liquid of splendid attire first and second sample bottle, the thermos that is used for splendid attire distilled water, the colour-developing agent bottle that is used for splendid attire resorcinol, the sulfuric acid bottle that is used for splendid attire sulphuric acid solution, the oxidant bottle that is used for splendid attire basicit. The utility model provides a total nitrogen on-line monitoring device detects the precision height, reduces the detection cost.
Description
Technical Field
The utility model belongs to the technical field of water quality testing, in particular to total nitrogen on-line monitoring device.
Background
The water pollutant discharge standard in China only stipulates ammonia nitrogen discharge limit, but does not stipulate total nitrogen discharge limit. Therefore, enterprises only pay attention to the removal of ammonia and helium in the wastewater treatment work. The total nitrogen comprises organic nitrogen, inorganic nitrogen, nitrite nitrogen and nitrate nitrogen, and the enterprise controls the ammonia nitrogen in the sewage only to convert the ammonia nitrogen into the nitrate nitrogen, and the total nitrogen is unchanged, so that the water eutrophication and other consequences are still caused. Experts point out that the harmless treatment of the ammonia nitrogen wastewater is only completed finally if the ammonia nitrogen and the total nitrogen are simultaneously controlled and nitrate nitrogen is converted into pollution-free nitrogen.
Several forms of nitrogen of concern in water and wastewater are ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, organic nitrogen and total nitrogen. The former four can be mutually converted through biochemical action, the latter is the synthesis of the former four and is an important index for lake reservoir water in GB3838-2002 surface water environment quality standard, and the increase of nitrogen content in the water body will cause the water body quality to be reduced. At present, more and more lake and reservoir water is used as a drinking water source or a standby water source, and nitrogen-containing compounds in various forms are measured, so that the method is favorable for evaluating the polluted and self-purification conditions of water bodies. For example, a large amount of domestic sewage or nitrogen-containing industrial wastewater is discharged into a water body, so that the content of organic nitrogen and various inorganic nitrogen compounds in the water is increased, and the mass propagation of organisms and microorganisms consumes dissolved oxygen in the water, so that the quality of the water body is deteriorated. Particularly for lake reservoir water bodies, due to the increase of the nitrogen content, plankton and algae in the water bodies are propagated in large quantities to consume dissolved oxygen in the water, so that the eutrophication degree of the lake reservoir water bodies is accelerated. Therefore, total nitrogen is one of the important indicators for measuring water quality.
The total nitrogen is determined by the following method: (1) ultraviolet spectrophotometry; (2) gas phase molecular absorption spectrometry; (3) azo colorimetry. The azo colorimetric method is too complex, has higher requirements on reagents, and is not suitable for online monitoring; the ultraviolet spectrophotometry and the gas phase molecular absorption spectrometry are simpler in measurement method and easy to realize on-line monitoring, but because the gas phase molecular absorption spectrometry needs to gasify a water sample, the ultraviolet spectrophotometry needs multiband detection, generally needs a deuterium lamp and a spectrometer, and is higher in cost, the spectrophotometry is applied to an on-line automatic monitoring instrument in the current research and development, so that the result is consistent with the result of the national standard method, and the manufacturing cost is reduced.
Disclosure of Invention
The utility model aims at providing a total nitrogen on-line monitoring device for detect total nitrogen concentration, convenient operation, detection efficiency is high.
Based on the above problem, the utility model provides a technical scheme is:
the total nitrogen on-line monitoring device comprises a sampling system, a reaction system, a detection system and a PLC control system, wherein the PLC control system controls the sampling system to sample and then react through the reaction system, reaction liquid is automatically monitored through the detection system, the sampling system comprises a multidirectional selection valve for switching pipelines, a peristaltic pump for providing sampling power and a metering device, the reaction system comprises a digestion bottle, and the reaction system comprises a spectrophotometry detection system;
the multidirectional selection valve comprises seven liquid inlet valve ports and two liquid outlet valve ports, a liquid inlet of the metering device is connected to one of the liquid outlet valve ports through a liquid inlet pipeline, a liquid outlet of the metering device is connected to the digestion bottle through a liquid outlet pipeline, the peristaltic pump is arranged on the liquid outlet pipeline, the digestion bottle is connected to one of the liquid inlet valve ports through a liquid outlet pipeline, the other six liquid inlet valve ports are respectively connected to a to-be-detected water sample through pipelines, a first standard bottle and a second standard bottle for containing standard use liquids of potassium nitrate with different concentrations, a distilled water bottle for containing distilled water, a color developing agent bottle for containing resorcinol, a sulfuric acid bottle for containing sulfuric acid solution and an oxidant bottle for containing alkaline potassium persulfate solution, the other liquid outlet valve port is connected to a waste liquid storage bottle and a waste water storage bottle, and the pipelines connected with the multidirectional selection valve are connected through a first three-way valve, and the waste liquid storage bottle, the waste water storage bottle and a pipeline connected with the multidirectional selection valve are connected through a second three-way valve.
In some embodiments thereof, the reaction system further comprises a heating device for heating the digestion vessel.
In some of these embodiments, the metering device is a photoelectric metering tube.
Compared with the prior art, the utility model has the advantages that:
1. the monitoring device combines the digestion principle in the alkaline potassium persulfate digestion ultraviolet spectrophotometry for measuring total nitrogen in the water quality of HJ 636 and 2012 and the colorimetric principle of the resorcinol spectrophotometry for measuring nitrate in surface water: in the aqueous solution with the temperature of above 60 ℃, potassium persulfate can be decomposed to generate potassium bisulfate and atomic oxygen, and the potassium bisulfate is dissociated in the solution to generate hydrogen ions, so that the decomposition process can be promoted to be complete in an alkaline medium of sodium hydroxide; the decomposed atomic oxygen can convert nitrogen elements of nitrogen-containing compounds in a water sample into nitrates at 120-124 ℃, organic matters are simultaneously oxidized and decomposed into nitrates in the process, nitrate ions and resorcinol generate faint yellow nitro compounds in a sulfuric acid medium, the absorbance at the wavelength of 360nm accords with the beer law, a near ultraviolet light source with high brightness and special characteristic features and a single wavelength of 360nm is adopted, a complex light splitting system is not needed, and hardware cost, monitoring cost, maintenance cost and technical maintenance difficulty are reduced; the inlet and outlet of the reaction solution are controlled by the multidirectional selection valve, the reaction solution is accurately metered by the metering device, the operation is convenient, and the detection efficiency is high;
2. the reagent adopts a peristaltic pump negative pressure suction mode, so that liquid is prevented from contacting with a pump tube, the pollution of the pump tube to the liquid is avoided, and the corrosion of the pump tube is avoided;
3. the error caused by unstable flow of the peristaltic pump is overcome by adopting the photoelectric metering tube;
4. the waste liquid separation function is added, the test waste liquid and the cleaning waste water are separated, the generation amount of the polluted waste liquid is reduced, and the waste liquid treatment cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the total nitrogen on-line monitoring device of the present invention;
wherein:
1. a multi-directional selector valve; 2. a liquid inlet pipeline; 3. a metering device; 4. a liquid outlet pipeline; 5. a peristaltic pump; 6. a digestion bottle; 7. a spectrophotometric detection system; 8. a water sample to be detected; 9. a first sample vial; 10. a second sample vial; 11. a distilled water bottle; 12. a waste liquid storage bottle; 13. a waste water storage bottle; 14. a color developing agent bottle; 15. a sulfuric acid bottle; 16. an oxidant bottle; 17. a first three-way valve; 18. a second three-way valve; 19. a liquid discharge pipeline.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.
Referring to fig. 1, for the utility model discloses the structure schematic diagram provides a total nitrogen on-line monitoring device, including sampling system, reaction system, detecting system and PLC control system, sampling system, reaction system, detecting system respectively with PLC control system signal connection, through the reaction of reaction system after PLC control system control sampling system advances a kind, reaction liquid realizes automatic monitoring through detecting system.
Wherein, sampling system is including being used for switching the multidirectional select valve 1 of pipeline, being used for providing peristaltic pump 5 and metering device 3 of sampling power, and reaction system is including clearing up bottle 6, and reaction system includes spectrophotometry detecting system 7, and multidirectional select valve 1, spectrophotometry detecting system 7 are prior art, the utility model discloses no longer describe repeatedly.
The multi-directional selector valve 1 comprises seven liquid inlet valve ports and two liquid outlet valve ports, a liquid inlet of a metering device 3 is connected to one of the liquid outlet valve ports through a liquid inlet pipeline 2, a liquid outlet of the metering device 3 is connected to a digestion bottle 6 through a liquid outlet pipeline 4, a peristaltic pump 5 is arranged on the liquid outlet pipeline 4, the digestion bottle 6 is connected to one of the liquid inlet valve ports through a liquid outlet pipeline 19, the other six liquid inlet valve ports are respectively connected to a to-be-detected water sample 8, a first standard sample bottle 9 and a second standard sample bottle 10 for containing standard potassium nitrate use liquids with different concentrations, a distilled water bottle 11 for containing distilled water, a color developing agent bottle 14 for containing resorcinol solution, a sulfuric acid bottle 15 for containing sulfuric acid solution, an oxidant bottle 16 for containing over-alkaline potassium sulfate solution, the other liquid outlet valve port is connected to a waste liquid storage bottle 12 and a waste water storage bottle 13, the first standard sample bottle 9 and the second standard sample bottle 10 are connected with a pipeline connected with the, the pipeline that waste liquid storage bottle 12, waste water storage bottle 13 and multidirectional selection valve 1 are connected through second three-way valve 18, select the potassium nitrate standard use liquid that sends into different concentration through first three-way valve 17, divide out test waste liquid and washing waste water through second three-way valve 18, increase waste liquid separation function, reducible pollution waste liquid production volume reduces the waste liquid treatment cost.
In this case, the reaction system further comprises a heating means for heating the digestion vessel 6 to a medium reaction temperature.
Metering device 3 adopts the photoelectric metering pipe for overcome 5 unstable errors that cause of flow of peristaltic pump, the photoelectric metering pipe is prior art, the utility model discloses no longer give unnecessary details.
The utility model discloses a theory of operation does: (1) preparing reagents according to a digestion principle in an alkaline potassium persulfate digestion ultraviolet spectrophotometry for measuring total nitrogen in HJ 636 and 2012 water and a colorimetric principle in a method for measuring nitrate in surface water by a resorcinol spectrophotometry, wherein the reagents comprise a potassium nitrate standard use solution, an alkaline potassium persulfate solution, a sulfuric acid solution and a resorcinol solution;
(2) flushing each pipeline, the photoelectric metering tube and the digestion bottle by using a water sample to be detected to remove residual pollutants, and then discharging flushing wastewater in the digestion bottle into a wastewater bottle;
(3) adding a water sample to be detected into a digestion bottle, adding an alkaline potassium persulfate solution, starting a heating device to perform high-temperature digestion at 120 ℃, cooling to room temperature, and adding sulfuric acid and a color-developing agent resorcinol solution;
(4) placing the digestion bottle in a spectrophotometric detection system to detect the absorbance of the water sample, and discharging the waste liquid in the digestion bottle into a waste liquid bottle after the detection is finished;
(5) washing the whole system with distilled water, discharging the washing wastewater to a wastewater bottle, measuring a blank value of the distilled water to correct the total nitrogen concentration, adding the standard potassium nitrate use solutions with different concentrations into the digestion bottle, measuring the absorbance of each standard potassium nitrate use solution according to the step (4), drawing a calibration curve by taking the measured absorbance as a vertical coordinate and the total nitrogen content as a horizontal coordinate, and then calculating the concentration of the total nitrogen in the water sample according to the absorbance measured in the step (4).
The above examples are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable one skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. Total nitrogen on-line monitoring device, including sampling system, reaction system, detecting system and PLC control system, PLC control system control sampling system advances the back warp reaction system reaction, reaction liquid warp detecting system realizes automatic monitoring, its characterized in that: the sampling system comprises a multi-way selector valve (1) for switching pipelines, a peristaltic pump (5) for providing sampling power and a metering device (3), the reaction system comprises a digestion bottle (6), and the reaction system comprises a spectrophotometric detection system (7);
the multidirectional selection valve (1) comprises seven liquid inlet valve ports and two liquid outlet valve ports, a liquid inlet of the metering device (3) is connected to one of the liquid outlet valve ports through a liquid inlet pipeline (2), a liquid outlet of the metering device (3) is connected to the digestion bottle (6) through a liquid outlet pipeline (4), the peristaltic pump (5) is arranged on the liquid outlet pipeline (4), the digestion bottle (6) is connected to one of the liquid inlet valve ports through a liquid outlet pipeline (19), the other six liquid inlet valve ports are respectively connected to a water sample (8) to be tested through pipelines, a first standard bottle (9) and a second standard bottle (10) for containing standard potassium nitrate use liquids with different concentrations, a distilled water bottle (11) for containing distilled water, a color developing agent bottle (14) for containing resorcinol solution, a sulfuric acid bottle (15) for containing sulfuric acid solution, and an oxidant bottle (16) for containing alkaline potassium persulfate solution, the other liquid outlet valve port is connected to a waste liquid storage bottle (12) and a waste water storage bottle (13), the first standard sample bottle (9) and the second standard sample bottle (10) are connected with a pipeline connected with the multi-directional selector valve (1) through a first three-way valve (17), and the waste liquid storage bottle (12) and the waste water storage bottle (13) are connected with a pipeline connected with the multi-directional selector valve (1) through a second three-way valve (18).
2. The total nitrogen on-line monitoring device according to claim 1, characterized in that: the reaction system also comprises a heating device for heating the digestion bottle (6).
3. The total nitrogen on-line monitoring device according to claim 1, characterized in that: the metering device (3) is a photoelectric metering tube.
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| CN202020619505.7U CN211955227U (en) | 2020-04-22 | 2020-04-22 | Total nitrogen on-line monitoring device |
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| CN202020619505.7U CN211955227U (en) | 2020-04-22 | 2020-04-22 | Total nitrogen on-line monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210208116A1 (en) * | 2018-05-18 | 2021-07-08 | Tongji University | Instrument and method for simultaneously testing molecular weight distribution and organic nitrogen level of water sample |
| CN113670861A (en) * | 2021-08-12 | 2021-11-19 | 力合科技（湖南）股份有限公司 | Total nitrogen analyzer and total nitrogen determination method |
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2020
- 2020-04-22 CN CN202020619505.7U patent/CN211955227U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210208116A1 (en) * | 2018-05-18 | 2021-07-08 | Tongji University | Instrument and method for simultaneously testing molecular weight distribution and organic nitrogen level of water sample |
| US11796525B2 (en) * | 2018-05-18 | 2023-10-24 | Tongji University | Instrument and method for simultaneously testing molecular weight distribution and organic nitrogen level of water sample |
| CN113670861A (en) * | 2021-08-12 | 2021-11-19 | 力合科技（湖南）股份有限公司 | Total nitrogen analyzer and total nitrogen determination method |
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