CN116202979A - Water quality on-line analysis device based on ultraviolet spectroscopy - Google Patents
Water quality on-line analysis device based on ultraviolet spectroscopy Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/04—Batch operation; multisample devices
- G01N2201/0484—Computer controlled
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
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Abstract
The invention discloses a water quality online analysis device based on ultraviolet spectroscopy, which relates to the technical fields of instrument science and technology, control science, environmental protection and applied chemistry, and comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system; the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing and diluting the sample liquid and distilled water; the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit; the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system; the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system. The invention can finally realize real-time online measurement of spectrum data and can monitor and early warn sudden water pollution accidents.
Description
Technical Field
The invention relates to the technical fields of instrument science and technology, control science, environmental protection and applied chemistry, in particular to an on-line analysis device for industrial and agricultural wastewater and urban domestic sewage quality.
Background
It is well known that water is not only an essential natural resource for human society development, but also the material basis upon which humans and all living beings depend to survive. However, with the rapid development of social economy and the rapid growth of population, the industrial and agricultural wastewater and urban domestic sewage discharge is rapidly increased, so that the originally deficient surface water resource is greatly polluted, water pollution events and sudden water pollution accidents are frequent, and the alarm clock for water quality safety is knocked.
Water quality pollution generally means that certain indexes of water body exceed normal standards, if alarming and treatment cannot be timely carried out, serious consequences are caused, for example, an amine benzene workshop of a petrochemical company in 2005 explodes, and an accident directly causes the water body in a downstream pine Jiang Haer beach section to be polluted, so that a water supply system of a Harbin city is stopped for a plurality of days; in 2007, blue algae burst caused by the eutrophication of the water body of the Taihu lake causes that residents cannot drink tap water normally. At present, the current state of water quality of urban water supply systems in China is optimistic.
In general, emergency monitoring (emergencies) of water environmental pollution sources is mainly based on offline and non-real-time detection by a single instrument and even non-online monitoring of manual periodic inspection sampling and laboratory analysis. The method has long detection period, limited water area range and lack of water quality change early warning mechanism, is difficult to grasp the change condition of water quality along with time in time, and can not meet the requirements of water environment monitoring departments on water resource protection, supervision, management and the like. In order to avoid the occurrence of water quality pollution events as much as possible and to timely process the water quality pollution events so as to prevent the influence surface from further expanding, the water quality needs to be monitored in real time, real-time water quality data are obtained, and the water quality safety condition is accurately evaluated.
Statistics data show that organic pollution often accounts for a large proportion in pollution problems faced by water environment in China at present. The establishment of an organic matter monitoring system at a heavy-point pollution source and an observation network point is a feasible measure for monitoring the organic matters of water quality in real time. The conventional off-line water quality detection mode is generally based on a laboratory detection mode, and has the defects of long measurement period, difficult sampling and the like although the measurement is accurate. Therefore, the research and development and application of the water quality on-line monitoring technology and system are receiving a great deal of attention.
At present, common online water quality monitoring methods mainly comprise a chemical method, a chromatographic method, a biological method and the like according to different detection principles. The method has the defects of long analysis time, higher detection cost, more reagents, complex operation, easy secondary pollution, difficult on-line monitoring requirement and the like in the analysis process.
With the continuous development of molecular spectroscopy, the ultraviolet visible spectrum is increasingly applied in the field of water quality monitoring. The basic principle is that according to the fact that substances have different absorption peaks under the ultraviolet spectrum, whether the water quality is abnormal or not is judged by monitoring the change of the ultraviolet spectrum of the water quality.
The ultraviolet-visible spectroscopy method has the following advantages compared with other analysis methods for water quality monitoring:
(1) Chemical trial production is not needed, so that secondary pollution is avoided;
(2) The water sample requires no or little pretreatment. The ultraviolet monitor has a simple structure, and reduces the operation and maintenance cost;
(3) The detection is rapid, and the requirement of on-line monitoring can be met. Meanwhile, based on the response of organic substances to ultraviolet spectrum, a plurality of parameters such as COD, an accurate acid salt and the like can be detected at the same time.
Therefore, how to provide an online water quality analysis device based on ultraviolet spectroscopy is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides an online water quality analysis device based on ultraviolet spectroscopy, which aims to solve the above technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an on-line water quality analysis device based on ultraviolet spectroscopy, comprising: the system comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system;
the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing dilution of sample liquid and distilled water;
the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;
the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system;
the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system.
Through the technical scheme, the system comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and on-line measurement system, so that the functions of automatic sampling, automatic proportioning dilution, automatic measurement, automatic cleaning and the like of different substance concentrations in water are realized; the change of the concentration of pollutants in water can be monitored in real time by detecting the change of the spectrogram, and the invention combines the singlechip control system with the online measurement main interface to finally realize the real-time online measurement of the spectrum data, thereby being capable of monitoring and early warning sudden water pollution accidents and having important effect on preventing and treating water pollution.
Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the sample liquid provided by the automatic sampling unit and the distilled water provided by the automatic dilution unit are diluted by a mixing dilution unit.
Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the mixing and diluting unit includes a mixing and sampling tank, and a stirrer for stirring, the mixing and sampling tank has a sewage draining pipeline and a sample injection pipeline, the sewage draining pipeline is connected with the sewage tank, and the sample injection pipeline is connected with a solution receiving end of the spectrum measurement system.
Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the automatic sampling unit communicates the sample cell with the mixed sampling cell through a pump and valve matching structure, a sample injection metering tube is arranged on a communicating pipeline of the sample cell and the mixed sampling cell, and a first liquid level sensor is arranged in the sample injection metering tube.
Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the automatic dilution unit communicates the distilled water tank with the mixed sampling tank through a pump and valve matching structure, a water inlet quantitative cup is arranged on a communicating pipeline of the mixed sampling tank and the sample tank, and a second liquid level sensor is arranged in the water inlet quantitative cup.
Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, an inlet of the sample introduction quantitative pipe is communicated with the distilled water tank through a pump and valve matching structure, and an outlet of the sample introduction quantitative pipe is connected with the sewage tank through a valve body.
Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the spectrum measurement system includes a light source, a light path unit, a light splitting unit, a light filter and a sample chamber that are sequentially arranged, the sample chamber is used for receiving the mixed dilution liquid, the spectrum measurement system further includes a photoelectric conversion detection unit for detecting the mixed dilution liquid, and a processor electrically connected with the photoelectric conversion detection unit, and the processor is electrically connected with the data transmission and the online measurement system.
Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the single-chip microcomputer control system 51 comprises a single-chip microcomputer, and a motor driving unit and a valve group driving unit which are electrically connected with the single-chip microcomputer 51 respectively.
Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the data transmission and online measurement system includes a server and a monitoring computer electrically connected.
Compared with the prior art, the invention discloses a water quality online analysis device based on an ultraviolet spectrometry, which realizes the functions of automatic sampling dilution, automatic measurement, automatic cleaning and the like of pollutants in water by using the water quality online analysis device based on the ultraviolet spectrometry, which is simple, reliable and economical; and the change of water quality concentration can be observed in real time according to the peak value of the spectrogram, and the method has an important effect on preventing and treating water pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a water quality on-line analysis device based on ultraviolet spectroscopy;
FIG. 2 is a flow chart of the SCM control program software structure provided by the invention;
FIG. 3 is a flow chart showing the structure of specific operation steps of the ultraviolet spectrum on-line analysis system provided by the invention;
fig. 4 is a diagram illustrating an optical path system of the spectrum measuring system according to the present invention.
Wherein:
wherein:
1-a sample cell; 2-a sample introduction peristaltic pump; 3-sample introduction filter; 4-a sample injection electromagnetic valve; 5-flushing/emptying solenoid valve; 6-flushing a peristaltic pump; 7-sampling a quantitative cup; 8-a first level sensor; 9-a second level sensor; 10-a discharge solenoid valve; 11-a stirrer; 12-a water inlet quantitative cup; 13-a water inlet electromagnetic valve; 14-a peristaltic pump for water inlet; 15-sample preparing electromagnetic valve; 16-a water discharge electromagnetic valve; 17-a distilled water tank; 18-mixing a sampling pool; 19-a sewage pool; 20-a blowdown electromagnetic valve; 21-lofting solenoid valve; 22-sampling metering tube; 23-a sampling electromagnetic valve; 24-light source; 25-an optical path unit; 26-a spectroscopic unit; 27-an optical filter; 28-sample chamber; 29-a photoelectric conversion detection unit; 30-a processor; 31-a first data line; a 32-server; 33-a second data line; 34-a monitoring computer; 35-51 singlechip; 36-a motor drive unit and a valve block drive unit; 37-tungsten lamp; 38-deuterium lamp; 39-a lamp reflector; 40-condensing lens; 41-a light splitting box; 42-entrance slit; 43-exit slit; 44-a collimating mirror; 45-grating; 46-an objective lens; a 47-filter; 48-exit mirror.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment of the invention discloses a water quality online analysis device based on ultraviolet spectroscopy, which comprises: the system comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system;
the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing and diluting the sample liquid and distilled water;
the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;
the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system;
the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system.
Specifically, the autosampling dilution system includes: sample cell 1, advance appearance peristaltic pump 2, advance appearance filter 3, advance appearance solenoid valve 4, wash/empty solenoid valve 5, wash peristaltic pump 6, advance appearance quantitative cup 7, first level sensor 8, second level sensor 9, arrange appearance solenoid valve 10, agitator motor 11, advance water quantitative cup 12, advance water solenoid valve 13, advance water peristaltic pump 14, join in marriage appearance solenoid valve 15, drain solenoid valve 16, distilled water pond 17, mix sampling pond 18, effluent water sump 19, blowdown solenoid valve 20, lofting solenoid valve 21, sample quantitative pipe 22 and sample solenoid valve 23.
The sample cell 1 is sequentially connected with a sample peristaltic pump 2, a sample filter 3, a sample solenoid valve 4, a sample quantitative cup 7 and a sample discharge solenoid valve 10; the sample injection quantitative cup 7 is sequentially connected with a flushing/emptying electromagnetic valve 5, a flushing peristaltic pump 6 and a distilled water tank 17; the distilled water pool 17 is connected with a water inlet peristaltic pump 14, a water inlet electromagnetic valve 13 and a water inlet quantitative cup 12 in sequence; the top of the mixing sampling pool 18 is connected with a sample preparation electromagnetic valve 15, a water discharge electromagnetic valve 16 and a stirring motor 11; the bottom of the mixed sampling pool 18 is connected with a sewage pool 19, a sewage discharging electromagnetic valve 20, a lofting electromagnetic valve 21, a sampling quantitative pipe 22 and a sampling electromagnetic valve 23, and the first liquid level sensor 8 and the second liquid level sensor 9 are respectively connected with the sampling quantitative pipe 7 and the water inlet quantitative cup 12.
The singlechip control system comprises a 51 singlechip 35, a motor driving unit and a valve group driving unit 36; the singlechip 35 is connected with the motor driving unit and the valve group driving unit 36; the motor driving unit and the valve group driving unit 36 are connected with the sample injection solenoid valve 4, the flushing/discharging solenoid valve 5, the water inlet solenoid valve 13, the sample discharge solenoid valve 10, the stirring motor 11, the sample preparation solenoid valve 15, the water discharge solenoid valve 16, the pollution discharge solenoid valve 20, the sample discharge solenoid valve 21 and the sampling solenoid valve 23.
As shown in fig. 1 and 4, the spectrum measuring system includes a light source 24, an optical path unit 25, a spectroscopic unit 26, a filter 27, a sample chamber 28, a photoelectric conversion detection unit 29, and a processor 30. The light source 24 is connected to the light path unit 25, the light splitting unit 26, the optical filter 27, the sample chamber 28, the photoelectric conversion detection unit 29, and the processor 30 in this order.
The data transmission and on-line measurement system comprises a first data line 31, a server 32, a second data line 33 and a monitoring computer 34. The server 32 is connected to the processor 30 via a first data line 31, the server 32 is connected to the monitoring computer 34 via a second data line 33, and the monitoring computer 34 is connected to the 51 single-chip microcomputer 35.
The specific operation steps of the ultraviolet spectrum on-line analysis system are shown in the structural flow chart of figure 3: the second liquid level sensor 9 sends out an interrupt signal, the 51 singlechip 35 sends out an instruction, then the monitoring computer 34 controls the water inlet peristaltic pump 14, the water inlet electromagnetic valve 13, the water discharge electromagnetic valve 16, the lofting electromagnetic valve 21 and the sampling electromagnetic valve 23 through the 51 singlechip 35, quantitative distilled water is added into the mixed sampling tank 18 according to the requirement, and a reference spectrum is measured; the first liquid level sensor 8 sends out an interrupt signal, the 51 single chip microcomputer 35 sends out an instruction, then the monitoring computer 34 controls the peristaltic pump 2, the sample injection electromagnetic valve 4, the sample preparation electromagnetic valve 15, the sample injection electromagnetic valve 21, the sample injection electromagnetic valve 23 and the stirrer 11 through the 51 single chip microcomputer 35, quantitative sample liquid is added into the mixed sampling tank 18, the spectrum diagram is measured after uniform mixing, the obtained spectrum diagram is stored, and the spectrum diagram of the current sample liquid is displayed in real time while the spectrum data is stored so as to carry out subsequent processing. The mixed liquor is finally drained and the mixed sampling tank 18 is cleaned. If a different concentration of sample fluid needs to be measured, the next measurement cycle needs to be performed.
Referring to fig. 4, in the spectrum measuring system provided in this embodiment, the light source 24 adopts a tungsten lamp 37 and a deuterium lamp 38, the tungsten lamp 37 and the deuterium lamp 38 reflect the light source reflector 39, then pass through the incident slit 42 on the spectroscopic box 41 via the condenser lens 40, enter the spectroscopic box 41, reflect via the collimator lens 44, the grating 45 and the objective lens 46, then emit from the exit slit 43 via the optical filter 27, and act on the sample chamber 28 via the exit mirror 48.
Example 1:
as shown in FIG. 1, the electromagnetic valve shown in the drawing adopts a two-position two-way miniature series direct-acting electromagnetic valve, the model of the electromagnetic valve is SLP1-3b, and the flow diameter is 2.5mm; the motor adopts a 12V direct current motor ASLONG company, and the idle rotation speed is 100r/min; the sensor adopts an XKC-Y26-V type non-contact pipeline liquid level sensor; the sample tank 1, the distilled water tank 17, the sample introduction quantitative cup 7, the water inlet quantitative cup 12, the mixed sampling tank 18 and the sewage tank 19 are all made of organic glass; the pipeline is made of a silica gel pipe; the peristaltic pump adopts a Baoding Lange BT100-2J type precise peristaltic pump; the motor driving unit and the valve group driving unit adopt an EM222 relay for output; the stirring rod and the stirring blade of the stirrer 11 are made of 304 stainless steel; the material of the coupler between the motor and the stirring rod is aluminum alloy, and the inner hole is 4-8mm.
In the process of producing beta-phenethylamine PEA, naOH is usually used as a reactant, naCl is often contained in the product, and finally, a mixture containing the three substances is discharged into water, which causes serious pollution to water quality. Therefore, the concentration of the three mixtures is monitored in real time and on line, and the method has important significance for reducing pollution and protecting the safety of surface water.
The specific on-line analysis steps are as follows:
step one: distilled water quantitative preparation and reference spectrum measurement: closing the water discharging electromagnetic valve 16, opening the water inlet electromagnetic valve 13 and the water inlet peristaltic pump 14, setting the position of the second liquid level sensor 9, enabling distilled water to sequentially flow through the water inlet peristaltic pump 14 and the water inlet electromagnetic valve 13, entering the water inlet quantitative cup 12, after the second liquid level sensor 9 detects the liquid level position, sending an interrupt signal by the second liquid level sensor 9, sending an instruction by the 51 singlechip 35 to close the water inlet peristaltic pump 14 and the water inlet electromagnetic valve 13, opening the water discharging electromagnetic valve 16, and measuring a reference spectrum after distilled water enters the mixed sampling pool 18.
Step two: and automatically and quantitatively sampling sample liquid of the mixture of PEA, naOH and NaCl: the sample introduction peristaltic pump 2 and the sample introduction electromagnetic valve 4 are opened, the position of the first liquid level sensor 8 is set, the sample liquid sequentially flows through the sample introduction peristaltic pump 2, the sample introduction filter 3 and the sample introduction electromagnetic valve 4, and enters the sample introduction quantitative cup 7, after the first liquid level sensor 8 detects the liquid level position, the first liquid level sensor 8 sends an interrupt signal, the 51 singlechip 35 sends an instruction to close the sample introduction peristaltic pump 2 and the sample introduction electromagnetic valve 4, and the quantitative sample sampling of the sample liquid is completed.
Step three: sample liquid is automatically diluted and mixed: opening a sample distribution electromagnetic valve 15 to enable the sample liquid in the sample injection quantitative cup 7 to flow into a mixed sampling pool 18; simultaneously, the stirrer 11 is turned on to uniformly mix distilled water and the sample liquid, and automatic dilution is completed.
Step four: ultraviolet spectrum measurement: after the solutions are uniformly mixed, the stirrer 11 is closed, the lofting electromagnetic valve 21 is opened, the sampling quantitative tube 22 is filled with the sample liquid, the lofting electromagnetic valve 21 is closed, the sampling electromagnetic valve 23 is opened, the sample chamber 28 is filled with the sample liquid, the light source 24 is opened, ultraviolet light passes through the light path unit 25, the light splitting unit 26, the optical filter 27, the sample chamber 28, the photoelectric conversion detection unit 29 and the processor 30, spectral data converted by the processor 30 are transmitted to the server 32 through the first data line 31 and are transmitted to the monitoring computer 34 through the second data line 33, and the spectral diagram of the current sample liquid is displayed in real time while the spectral data are stored so as to carry out subsequent processing. If the measured ultraviolet spectrum characteristic peak absorbance is greater than 4.0, the adding amount of distilled water is required to be increased; if the measured ultraviolet spectrum characteristic peak absorbance is smaller than 0.2, the adding amount of the sample liquid needs to be increased.
Step five: and (3) pollution discharge and cleaning of mixed liquid: the drain solenoid valve 20 is opened, the mixed solution is entirely flowed into the sewage tank 19, and then the drain solenoid valve 20 is closed. The water inlet electromagnetic valve 13 and the water outlet electromagnetic valve 16 are opened, so that water enters the mixing sampling tank 18, and the stirrer 11 is opened for cleaning. After the cleaning is finished, the water inlet electromagnetic valve 13 and the water outlet electromagnetic valve 16 are closed, the sewage discharging electromagnetic valve 20 is opened to discharge sewage, and the stirrer 11 is closed after the cleaning is finished. Then, the flushing/emptying solenoid valve 5 and the discharging solenoid valve 10 are opened to allow water to enter the sample introduction quantitative cup 7, the sample introduction quantitative cup 7 is cleaned, and sewage enters a sewage pool to be discharged. And then waits for the next measurement period.
Step six: spectral data preprocessing and man-machine interaction interface display: the collected spectrum data are stored in a computer, a spectrum data database is established, a pretreated spectrogram is obtained through pretreatment methods such as smoothing, wavelet transformation and baseline correction, the overall change condition of the mixed solution is detected in real time, and finally the overall change condition is displayed through a Gui man-machine interaction interface written by matlab, as shown in fig. 2, and the obtained spectrogram is used by operators.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An online water quality analysis device based on ultraviolet spectroscopy is characterized by comprising: the system comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system;
the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing dilution of sample liquid and distilled water;
the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;
the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system;
the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system.
2. The device for on-line analysis of water quality based on ultraviolet spectroscopy according to claim 1, wherein the sample liquid provided by the automatic sampling unit and the distilled water provided by the automatic dilution unit are diluted by the mixing dilution unit.
3. The ultraviolet spectroscopy-based water quality online analysis device according to claim 2, wherein the mixing dilution unit comprises a mixing sampling tank and a stirrer for stirring, the mixing sampling tank is provided with a sewage draining pipeline and a sample feeding pipeline, the sewage draining pipeline is connected with the sewage tank, and the sample feeding pipeline is connected with a solution receiving end of the spectrum measurement system.
4. The ultraviolet spectroscopy-based water quality online analysis device according to claim 3, wherein the automatic sampling unit is used for communicating the sample tank with the mixed sampling tank through a pump and valve matching structure, a sample introduction metering tube is arranged on a communicating pipeline of the sample tank and the mixed sampling tank, and a first liquid level sensor is arranged in the sample introduction metering tube.
5. The ultraviolet spectroscopy-based water quality online analysis device according to claim 4, wherein the automatic dilution unit is used for communicating the distilled water tank with the mixed sampling tank through a pump and valve matching structure, a water inlet quantitative cup is arranged on a communicating pipeline of the mixed sampling tank and the sample tank, and a second liquid level sensor is arranged in the water inlet quantitative cup.
6. The ultraviolet spectroscopy-based water quality online analysis device according to claim 5, wherein the inlet of the sample injection quantitative pipe is communicated with the distilled water tank through a pump and valve matching structure, and the outlet of the sample injection quantitative pipe is connected with the sewage tank through a valve body.
7. The ultraviolet spectroscopy-based water quality online analysis device according to any one of claims 1-6, wherein the spectrum measurement system comprises a light source, a light path unit, a light splitting unit, a light filter and a sample chamber which are sequentially arranged, the sample chamber is used for receiving mixed dilution liquid, the spectrum measurement system further comprises a photoelectric conversion detection unit used for detecting the mixed dilution liquid, and a processor electrically connected with the photoelectric conversion detection unit, and the processor is electrically connected with the data transmission and online measurement system.
8. The device of any one of claims 1-6, wherein the single-chip microcomputer control system 51 comprises a single-chip microcomputer, and a motor driving unit and a valve group driving unit which are electrically connected with the single-chip microcomputer respectively.
9. The ultraviolet spectroscopy-based water quality online analysis device of any one of claims 1-6, wherein the data transmission and online measurement system comprises a server and a monitoring computer which are electrically connected.
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