CN111766208B - Intelligent multi-parameter water quality analyzer and analysis method - Google Patents
Intelligent multi-parameter water quality analyzer and analysis method Download PDFInfo
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Abstract
The invention discloses an intelligent multi-parameter water quality analyzer, which comprises a measurement control module and a plurality of single-parameter analysis modules; the measuring module comprises an electrical component, an optical component and a sampling component; the electrical component is in communication connection with the optical component, the sampling component and the plurality of single parameter analysis modules; the optical component comprises a measuring device and a communication device communicated with the measuring device, the communication device is communicated with the sampling component and a plurality of single-parameter analysis modules, the communication device is also connected with a pure water device, and the sampling component comprises a sampling cup and a double-platinum-sheet electrode arranged in the sampling cup; the invention has the advantages of abundant measurement information and analysis time saving.
Description
Technical Field
The invention relates to the technical field of water quality analysis and detection, in particular to an intelligent multi-parameter water quality analyzer and an analysis method.
Background
The spectrophotometry water quality analyzer measures the concentration of the target pollutant by the absorbance of the mixed solution after the color reaction. Absorbance measurements are greatly affected by turbidity of the sample, resulting in distortion of the measurement results. In addition, the presence of interfering ions can interfere with the color reaction and can also lead to distortion of the measurement results. In engineering application, the analyzer generally needs laboratory analysis on the sample of the monitoring section, so as to comprehensively obtain the characteristics of the sample, and accordingly, the analysis flow and the data processing mode of the analyzer are adjusted to obtain accurate and reliable analysis results.
Chinese patent CN108680397B discloses a multi-parameter automatic water quality detection analyzer, and the analysis proposes a method for calibrating the analyzer in real time by using a water sample with good measurement accuracy as an analysis standard sample, but the analysis flow and the data processing mode cannot be intelligently optimized according to the sample information.
Chinese patent CN103983597B discloses a method and system for detecting total nitrogen and total phosphorus, wherein the system compensation algorithm is implemented by performing optical measurement on the sample in the digestion detection cell. The implementation method is that after sample introduction, spectrum measurement is firstly carried out on the sample, and then subsequent reagent filling and digestion reactions are carried out.
Disclosure of Invention
The invention aims to provide an intelligent multi-parameter water quality analyzer and an analysis method, wherein an optical component of the intelligent multi-parameter water quality analyzer is provided with an independent flow path system, can be used for carrying out spectrum measurement on pure water and a sample independently of each parameter analysis module, and has the advantages of rich measurement information and analysis time saving.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides an intelligent multi-parameter water quality analyzer, which comprises a measurement control module and a plurality of single-parameter analysis modules;
the measuring module comprises an electrical component, an optical component and a sampling component; the electrical component is in communication connection with the optical component, the sampling component and the plurality of single parameter analysis modules;
the optical component comprises a measuring device and a communicating device communicated with the measuring device, the communicating device is communicated with the sampling component and a plurality of single-parameter analysis modules, the communicating device is also connected with a pure water device, and the sampling component comprises a sampling cup and a double-platinum-sheet electrode arranged in the sampling cup.
Further, the water quality parameters analyzed by the single parameter analysis module comprise ammonia nitrogen, total phosphorus, total nitrogen and permanganate index.
Further, the electrical components include an electrical control component and a graphical interface.
Further, the communication device is a multi-channel switching valve.
Further, the measuring device comprises a light source, a spectrometer, a measuring cell and a first peristaltic pump, wherein the measuring cell is communicated with the communicating device, the first peristaltic pump is communicated with the measuring cell, the light source is arranged on one side of the measuring cell, and the spectrometer is arranged on the other side of the measuring cell and opposite to the light source.
Further, the light source comprises a xenon lamp light source and a halogen tungsten lamp light source.
Further, a water sample inlet and a water sample outlet are formed in the sampling cup, the water sample inlet is communicated with a water source end through a pipeline and a second peristaltic pump, and the water sample outlet is communicated with a waste water end through a pipeline and a water pump.
The invention also provides an intelligent multiparameter water quality analysis method, which comprises the following steps:
the electrical component controls the sampling component to sample, acquires water sample information, and judges whether to start an optimized analysis flow according to the water sample information;
the electrical component control single parameter analysis module extracts a water sample, adds a reagent, and carries out digestion reaction on the mixed solution in the single parameter analysis module according to the result of whether to start an optimized analysis flow;
the electric component controls the measuring device to acquire a pure water spectrum and a water sample spectrum, calculates and outputs water sample parameter information according to the analysis of the pure water spectrum and the water sample spectrum, and starts an optimized data processing mode to acquire the processed water sample parameter information;
the electric component controls the measuring device to acquire the spectrum of the reaction liquid after digestion reaction in the single-parameter analysis module, and starts an optimized data processing mode to acquire the parameter information of the reaction liquid.
According to the technical scheme, the embodiment of the invention has at least the following effects:
1. the optical component is provided with the independent communication device, the communication component is communicated with the plurality of single-parameter analysis modules, the sampling component and the pure water device, and when the device is used, the optical component and the single-parameter analysis modules can work simultaneously, the optical component can perform spectral measurement of pure water and a sample independently of the parameter analysis modules, the measurement information is rich, and the analysis time is saved.
2. The electric component, the sampling component, the optical component and the single parameter analysis module are in communication connection, the analysis flow and the data processing mode can be intelligently optimized according to the measurement information, and the accuracy of the analysis result is good.
Drawings
FIG. 1 is a schematic block diagram of a water quality analyzer according to an embodiment of the present invention;
FIG. 2 is an analysis flow chart of an embodiment of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
It should be noted that, in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. The terms "front", "back", "left", "right", "upper", "lower" as used in the description of the present invention refer to directions in the drawings, and the terms "inner", "outer" refer to directions toward or away from the geometric center of a particular component, respectively.
Example 1
As shown in fig. 1, the present invention provides an intelligent multi-parameter water quality analyzer, which includes a plurality of single-parameter analysis modules, such as a parameter 1 analysis module, a parameter 2 analysis module. The single parameter analysis module can complete the processes of sample injection, metering, digestion reaction and the like according to the relevant national standard measurement principle aiming at single parameter analysis. The single parameter analysis module mainly comprises an injection pump, a selector valve, an electromagnetic valve, a liquid flow sensor, a digestion device and liquid flow management. The injection pump is used for providing the sample feeding power of the single-parameter analysis module and measuring liquid, the selection valve is used for switching between a water sample and different reagents, the electromagnetic valve is used for switching off and switching on the pipeline to realize a specific liquid path function, and the liquid flow sensor is used for detecting the liquid in the pipeline so as to feed back whether the analysis module works normally.
The parameters which can be analyzed by the single-parameter analysis module are common water quality parameters such as ammonia nitrogen, total phosphorus, total nitrogen, permanganate index and the like. The measurement control module comprises an electrical component, an optical component and a sampling component. The electric component is composed of a graphic interface and an electric control component and is used for displaying measurement data and coordinating the operation of each module in the analyzer. In the present invention, the electrical component may be an industrial personal computer. The electric component is respectively in communication connection with the optical component single-parameter analysis module and the sampling component, controls the optical component, the sampling component and the single-parameter analysis module to work, and records and displays related data information.
The single parameter analysis module is designed with an electrical interface and a pipeline interface, the electrical interface communicates with the measurement control module through a communication bus, and the pipeline interface is connected to the optical component and used for realizing the liquid path connection of the optical component and the analysis module.
The optical component consists of a broad spectrum light source, a spectrometer, a measuring cell, a first peristaltic pump and a multi-channel switching valve. The number of channels of the multi-channel switching valve is two more than that of the single parameter analysis module in the invention. The channels of the multi-channel switching valve are communicated with each single-parameter analysis module. The measuring pool is communicated with the multichannel switching valve, and a first peristaltic pump is arranged on the measuring pool and is used for extracting samples. The wide spectrum light source is installed in the left side of measuring cell, and the spectrum appearance is installed in the right side of measuring cell, and the illumination of wide spectrum light source can be received to the spectrum appearance. The optical component is used to draw different samples into the cell and to take its broad spectrum measurement data. The wide spectrum light source consists of a xenon lamp and a halogen tungsten lamp light source, and the emission spectrum can be in the ultraviolet to near infrared spectrum. The spectrometer can acquire spectrum data of incident light from ultraviolet to near infrared spectrum, so that sufficient data support is provided for spectrum analysis and calculation.
The sampling part consists of a sample water cup, a second peristaltic pump and a double-platinum-sheet electrode. The second peristaltic pump is used for extracting the analysis sample into the sample water cup for analysis by each single-parameter analysis module. The double-platinum-sheet electrode has two functions, can be used for judging whether the liquid level in the sample water cup reaches a specified position or not, can also be used for measuring the conductivity of the analysis sample, and provides a certain basis for intelligent optimization of the subsequent analysis flow. In order to realize liquid level judgment and conductivity measurement, the double-platinum-sheet electrode is connected with a measurement and control circuit. The measurement and control circuit applies constant excitation current to the double-platinum-sheet electrode on one hand and monitors voltage change on the double-platinum-sheet electrode on the other hand. When the sample water cup is free of liquid, the resistance between the double platinum sheets tends to infinity, and at the moment, the voltage at the two ends of the platinum sheets tends to measure and control the power supply voltage of the circuit. When liquid exists in the sample water cup, the resistance between the double platinum sheets can change according to the conductivity of an actual water sample, so that a specific output voltage is generated. By calibration, a relation curve of the conductivity and the output voltage at two ends of the double platinum sheet can be obtained, so that the conductivity of the water sample is obtained.
The working flow of the analysis is shown in figure 2, after the flow is started, the industrial personal computer firstly controls the sampling component to sample, and monitors the conductivity in the sample cup in real time through the double-platinum-sheet electrode, no sample is arranged in the sample cup in an initial state, the conductivity tends to be zero, after the sample enters the sample cup and reaches a preset position, the conductivity becomes the actual conductivity value of the sample, and the industrial personal computer judges whether the sample cup finishes sampling or not and records the conductivity value of the sample according to the conductivity value. According to the conductivity value, the industrial control computer intelligently judges whether an optimal analysis flow is needed in the analysis process of the single parameter analysis module, wherein the optimal analysis flow comprises masking agent (ammonia nitrogen) or alkali switching (COD-Mn). For example, a sample conductivity of greater than 4000 μs/cm indicates that the concentration of calcium and magnesium ions in the sample is too high, which can interfere with measurement for ammonia nitrogen analysis, and the analysis flow is optimized and the masking agent addition flow is increased to obtain accurate analysis results. For an automatic monitoring station with a monitoring section at a sea entrance, the periodic backflow of seawater can cause the concentration of chloride ions to be increased rapidly, so that the analysis of permanganate index can be interfered, and at the moment, an industrial personal computer can intelligently optimize the permanganate index analysis flow according to the conductivity, and an alkaline analysis flow is adopted to obtain more accurate data.
After sampling the sample water cup, the industrial personal computer starts the analysis flow of each parameter and simultaneously starts the optical measurement flow. The single parameter analysis module will draw a sample and add reagents. And judging whether the analysis flow needs to be optimized or not to operate according to the intelligent of the industrial personal computer. When the optimized analysis flow is required to be started, judging whether the masking agent is required to be added according to the masking agent adding mark, and then carrying out digestion reaction after uniformly mixing the solution. The single parameter module analyzes and the optical component starts to carry out an optical measurement process, pure water is firstly extracted to carry out spectrum measurement as a reference spectrum, and then a water sample is extracted to carry out spectrum measurement. After the pure water spectrum and the water sample spectrum are obtained, the industrial control computer can perform spectral analysis calculation, directly output the parameter measurement information such as turbidity, UV254, NO3 and the like, intelligently optimize the data processing mode according to the turbidity measurement information, for example, start a turbidity removal algorithm, and perform algorithm setting. The common turbidity removal algorithm has a background compensation method, namely, the water sample without the reagent is used as a reference to calculate absorbance; or a compensation wavelength method, namely selecting one or more measurement wavelengths except for characteristic compensation, simultaneously measuring absorbance, and deducting the absorbance of the compensation wavelength when the final absorbance is calculated. Generally speaking, the turbidity of a sample of a colorimetry instrument should not be greater than 20NTU, but in the case of high sediment, the turbidity of a water sample can easily reach more than 500NTU, the turbidity of the sample can be reduced to be less than 300NTU by a proper pretreatment mode, under the condition, if the sample is analyzed according to the national standard method, pure water is used as a reference or the turbidity of the sample can be influenced, at the moment, a turbidity removal algorithm needs to be started, and an actual sample is used as a reference to obtain an accurate analysis result. The optical component waits for the reaction liquid measurement request of the single parameter analysis module after completing the optical measurement flow.
The single parameter analysis module sends a reaction liquid measurement request after completing digestion reaction and standing, and the optical component responds to the request and sequentially extracts the reaction liquid for spectrum measurement. And the industrial personal computer selects a proper data processing mode according to the intelligent optimization result to calculate, so that the analysis result of each parameter is obtained, displayed and stored, and then the analyzer cleans each parameter analysis module, the optical component and the empty sample water cup for next analysis.
Example 2
Based on the analyzer in the embodiment 1, the invention also provides an intelligent multi-parameter water quality analysis method, which comprises the following steps:
step 1, an electric component controls a sampling component to take a water sample, the sampling component acquires water sample information and transmits the acquired water sample information to the electric component, the electric component judges whether to start an optimized analysis flow according to the water sample information, and the water sample information comprises conductivity values of the water sample or geographical position information of the taken water sample.
And 2, extracting a water sample by the electric component control single parameter analysis module, adding a reagent, and carrying out digestion reaction on the mixed solution in the single parameter analysis module according to the result of whether to start the optimized analysis flow. Whether to start the optimized analysis flow in the step is whether to add a masking agent into the water sample in the perfume single parameter analysis module or switch the alkali method.
And 3, controlling a measuring device by the electric component to acquire a pure water spectrum and a water sample spectrum, analyzing and calculating the output water sample parameter information according to the pure water spectrum and the water sample spectrum, and starting an optimized data processing mode by the electric component to acquire the processed water sample parameter information. The water sample parameter information analyzed in the step comprises turbidity, UV254, NO3 and other information, wherein the directly acquired turbidity information is inaccurate, and the water sample parameter information is required to be processed in a start-up optimization data processing mode to acquire accurate turbidity information.
And 4, the electric component control measuring device acquires the spectrum of the reaction liquid after the digestion reaction in the single-parameter analysis module, and starts an optimized data processing mode to acquire the parameter information of the reaction liquid.
According to the invention, the optimal analysis step and the optimal data processing mode can be intelligently selected according to the characteristics of the sample, so that the multi-parameter information of the water sample can be obtained, and the method has the advantage of abundant water sample information.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (7)
1. An intelligent multi-parameter water quality analyzer is characterized by comprising a measurement control module and a plurality of single-parameter analysis modules;
the measurement control module comprises an electrical component, an optical component and a sampling component; the electrical component is in communication connection with the optical component, the sampling component and the plurality of single parameter analysis modules;
the optical component comprises a measuring device and a communication device communicated with the measuring device, the communication device is communicated with the sampling component and a plurality of single-parameter analysis modules, the communication device is also connected with a pure water device, and the sampling component comprises a sampling cup and a double-platinum-sheet electrode arranged in the sampling cup;
the double-platinum-sheet electrode monitors the conductivity in the sample water cup in real time, when the sample enters the sample water cup and reaches a preset position, the conductivity becomes the actual conductivity value of the sample, the industrial personal computer judges whether the sample water cup finishes sampling and records the conductivity value of the sample according to the conductivity value, the industrial personal computer intelligently judges whether an optimized analysis flow is needed in the analysis process of the single-parameter analysis module according to the conductivity value, the optimized analysis flow comprises judging whether a masking agent is needed to be added in the ammonia nitrogen analysis or whether an alkaline analysis flow is switched in the permanganate index analysis, and a turbidity removal algorithm is started according to turbidity measurement information;
the electric component controls the measuring device to acquire a pure water spectrum and a water sample spectrum, calculates and outputs water sample parameter information according to the analysis of the pure water spectrum and the water sample spectrum, and starts an optimized data processing mode to acquire the processed water sample parameter information;
the electric component controls the measuring device to acquire the spectrum of the reaction liquid after digestion reaction in the single-parameter analysis module, and starts an optimized data processing mode to acquire the parameter information of the reaction liquid.
2. The intelligent multiparameter water quality analyzer of claim 1, wherein the single parameter analysis module analyzes water quality parameters including ammonia nitrogen, total phosphorus, total nitrogen, and permanganate index.
3. The intelligent multiparameter water quality analyzer of claim 1, wherein the electrical components comprise an electrical control component and a graphical interface.
4. The intelligent multiparameter water quality analyzer of claim 1, wherein the communication device is a multichannel switching valve.
5. The intelligent multiparameter water quality analyzer of claim 1, wherein the measuring device comprises a light source, a spectrometer, a measuring cell and a first peristaltic pump, wherein the measuring cell is in communication with the communication device, the first peristaltic pump is in communication with the measuring cell, the light source is mounted on one side of the measuring cell, and the spectrometer is mounted on the other side of the measuring cell opposite to the light source.
6. The intelligent multiparameter water quality analyzer of claim 5, wherein the light source comprises a xenon light source and a tungsten halogen light source.
7. The intelligent multiparameter water quality analyzer of claim 1, wherein the sampling cup is provided with a water sample inlet and a water sample outlet, the water sample inlet is in communication with the water source end through a pipeline and a second peristaltic pump, and the water sample outlet is in communication with the wastewater end through a pipeline and a water pump.
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| CN113624686B (en) * | 2021-08-20 | 2024-07-16 | 南京南瑞水利水电科技有限公司 | Turbidity interference resistant water quality analysis device and method |
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| CN101476917B (en) * | 2009-01-20 | 2011-03-16 | 江苏工业学院 | Sensor for simultaneously detecting liquid level and electro-conductibility |
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