CN114577742A - Method and device for detecting pollutants in water - Google Patents

Method and device for detecting pollutants in water Download PDF

Info

Publication number
CN114577742A
CN114577742A CN202210212752.9A CN202210212752A CN114577742A CN 114577742 A CN114577742 A CN 114577742A CN 202210212752 A CN202210212752 A CN 202210212752A CN 114577742 A CN114577742 A CN 114577742A
Authority
CN
China
Prior art keywords
detected
water
led light
water sample
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210212752.9A
Other languages
Chinese (zh)
Inventor
王宁
程志亮
罗方舟
肖智文
陈启皓
郭誉浓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University of Technology WUT
Original Assignee
Wuhan University of Technology WUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University of Technology WUT filed Critical Wuhan University of Technology WUT
Priority to CN202210212752.9A priority Critical patent/CN114577742A/en
Publication of CN114577742A publication Critical patent/CN114577742A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses a method and a device for detecting pollutants in water, wherein the method comprises the following steps: the collected water samples are pretreated, multiple classification marks of the water samples to be detected are obtained in sequence, light beams emitted by multiple collimation LED light sources are transmitted through one of the multiple collimation LED light sources in sequence to be detected, the transmitted light beams are detected, the pollutant types corresponding to the collimation LED light sources are determined, meanwhile, the rotation angle of the collimation LED light sources is calibrated, the calibrated collimation LED light sources are transmitted through the water samples to be detected again to obtain stable light beams, stable light intensity data are further measured, the concentration of the corresponding pollutants is calculated, then the detection of the multiple classification marks of the water samples to be detected is performed in sequence, and the type and the corresponding concentration of each pollutant in the water samples to be detected can be detected. Therefore, the method for detecting the pollutants in the water can accurately detect the type and the concentration of each pollutant in the water sample to be detected by using a simple wide and common light source.

Description

Method and device for detecting pollutants in water
Technical Field
The invention relates to the technical field of pollutant detection, in particular to a method and a device for detecting pollutants in water.
Background
Water resources are the source of human life, and people can not live in boiling water. Over the years, the quality of water resources is continuously reduced, the water environment is continuously deteriorated, China is experiencing the unprecedented water pollution transformation, and the four water problems of the water resources, the water environment, the water ecology and the water disaster are mutually overlapped to influence the multiple water crisis of future development and safety of China, wherein the threat of water pollution is particularly prominent.
As is well known, compared with the traditional chemical analysis, electrochemical analysis and chromatographic analysis methods, the spectroscopic analysis technology has the advantages of simple and convenient operation, small reagent consumption, good repeatability, high measurement precision and quick detection, and is very suitable for quick online monitoring of environmental water samples.
However, most of light sources are single-spectrum light sources at present, and intelligent light sources mainly adopt light sources with large volume, short service life and complicated driving circuits of tungsten lamps, deuterium lamps, xenon lamps and high-voltage pump lamps, so that the intelligent light sources are large in size, high in price and short in service life. Of course, there are also multi-wavelength LED arrays as light sources, mainly in the following three forms:
the LED array focusing device is characterized in that each LED needs to be additionally provided with a lens, so that the structure is too complicated, and high-intensity light source output is difficult to achieve, so that the detection range is greatly reduced.
The LED light source consists of an LED array, a collimating lens and a spectroscope, and the LED light source is characterized in that all light can not be emitted from a lens crack, the intensity of output light is greatly reduced, and meanwhile, a plurality of lenses and spectroscopes are required to be additionally arranged, so that the LED light source is complex in structure and high in cost.
The LED light source consists of an LED array and a diffuser, and the LED light source is characterized in that the light wave band range is too wide, the emitted light is not uniform enough, the intensity is not enough, and the absorption peak detected by a photometry has great influence, so that the accuracy of the detection result is reduced.
The mainstream detection is still to detect single pollutants because of the limitation of a light source and an optical detection device, and the real-time quick detection of multiple pollutants in a small-volume device is difficult.
Disclosure of Invention
Accordingly, there is a need for a method and apparatus for detecting contaminants in water to solve the above-mentioned problems.
According to one aspect of the invention, a method and a device for detecting pollutants in water are provided, which comprises the following steps:
s1, collecting a water sample, pretreating pollutants in the collected water sample, and sequentially obtaining a plurality of classified marked water samples to be detected;
s2, rotating a plurality of collimation LED light sources which are arranged in an annular array and have the same light intensity and different wavelengths, enabling light beams emitted by the collimation LED light sources to sequentially penetrate one of the water samples to be detected, detecting the penetrated light beams until the wavelength of the light beams is detected to correspond to the wavelength of one pollutant in the water samples to be detected, stopping rotating, and generating wavelength data of the light beams;
s3, comparing and analyzing the wavelength data with a plurality of preset wavelength data to determine the specified rotation angle of the collimation LED light source corresponding to the light beam and the corresponding pollutant type, and calibrating the rotation angle of the collimation LED light source according to the specified rotation angle;
s4, measuring light intensity data of the light beam of the collimated LED light source which is calibrated and penetrates through the water sample to be detected, and calculating the concentration of the corresponding pollutant according to the light intensity data;
and S5, repeating the steps S2, S3 and S4 for each water sample to be detected so as to measure the type and concentration of each pollutant in the water sample to be detected.
According to some embodiments, the collection water sample is to the multiple pollutant in the water sample of gathering carry out the preliminary treatment, obtains the water sample that waits to detect of many shares in proper order, specifically includes: dividing the collected water sample into a plurality of water samples, and performing digestion treatment and color development treatment on pollutants in each water sample respectively to obtain a plurality of classified marked water samples to be detected;
according to some embodiments, the plurality of collimated LED light sources are arranged in a ring array with wavelengths sequentially increasing from a low-band wavelength to a high-band wavelength, and cover a wavelength range of 350nm to 1000 nm.
According to some embodiments, the calibrating the rotation angle of the collimated LED light source according to the specified rotation angle specifically includes substituting the specified rotation angle data and the actual rotation angle data of the collimated LED light source into a PID algorithm for calculation and analysis, and calibrating the rotation angle of the collimated LED light source according to an analysis result, where the PID algorithm is as follows:
A(k)＝A1-A0 (1)
in the formula (1), A1Is the actual rotation angle; a. the0Is a specified rotation angle; a (k) is a deviation value between the actual rotation angle and the designated rotation angle;
Figure BDA0003531513360000031
Figure BDA0003531513360000032
Figure BDA0003531513360000033
in formulae (2), (3) and (4), KpIs a proportionality coefficient, KiAs an integration constant, KdA differential constant, A (k) is the difference between the actual angle and the set angle, u (k) is the control quantity, u0To control the maximum value of the quantity, u1Is the minimum value of the control quantity, k is the integral control coefficient, and delta is the error standard.
According to one aspect of the present invention, there is provided an apparatus for detecting contaminants in water, comprising:
and the pollutant treatment module is used for carrying out pretreatment before detection on the collected sewage to sequentially obtain a plurality of classified marked water samples to be detected.
The optical detection flow cell is connected with the pollutant treatment module and used for detecting a water sample to be detected after circulation pretreatment, the optical detection flow cell comprises a light inlet and a light outlet, and the optical detection flow cell is provided with a liquid inlet and a liquid outlet.
LED array module, including motor, circular circuit board, a plurality of collimating lens and a plurality of light intensity the same and the wavelength difference be annular array arrange in LED light source on a circular circuit board side, every collimating lens correspond respectively install in every on the LED light source, the light path that supplies the LED light source to diverge converts collimation parallel light beam, motor drive circular circuit board rotates, every the LED light source rotates extremely in proper order go into light entrance department.
And the light source detection channel is positioned at the light outlet and used for receiving and detecting the collimated parallel light beam after penetrating the water sample to be detected until the wavelength of the light beam is detected to correspond to the wavelength of a pollutant in the water sample to be detected, and then the wavelength data of the light beam is generated.
The main control board is in communication connection with the light source detection channel and the motor, receives the wavelength data and performs contrastive analysis on a plurality of preset wavelength data to determine the specified rotation angle of the light beam to rotate and the corresponding pollutant types, the encoder of the motor transmits the actual rotation angle data of the LED light source to the main control board, substitutes the specified rotation angle data and the actual rotation angle data of the collimation LED light source into a PID algorithm to perform calculation and analysis, calibrates the rotation angle of the collimation LED light source according to an analysis result, measures the light intensity data of the light beam emitted by the collimation LED light source after calibration by the light source detection channel and transmits the light intensity data to the main control board, and the main control board calculates the concentration of the corresponding pollutant according to the light intensity data.
According to some embodiments, the device further comprises a sampling module, wherein the sampling module comprises a peristaltic pump and a tubule, and the main control board is connected with the peristaltic pump to control the flow rate of a water sample flowing into the pollutant treatment module.
According to some embodiments, the contaminant processing module comprises a plurality of water sample diversion pipes to divert the collected water samples into multiple fractions;
each water sample shunting pipeline is provided with a color development liquid cavity, a digestion liquid cavity, a color development liquid infusion pump and a digestion liquid infusion pump, the digestion liquid infusion pump is used for sequentially inputting digestion liquid in the digestion liquid cavity into each water sample to digest pollutants, and the color development liquid infusion pump is used for sequentially inputting color development liquid in the color development liquid cavity into the water sample of each water sample shunting pipeline to perform color development treatment on the digested pollutants.
According to some embodiments, the device further comprises a plurality of electromagnetic valves, wherein the electromagnetic valves are respectively and correspondingly communicated with the outlet end of each water sample diversion pipeline and the liquid inlet end of each optical detection flow cell;
and when the wavelength conversion of the LED light source is completed, the electromagnetic valve opens the corresponding water sample diversion pipeline and introduces the water sample to be detected for detection.
According to some embodiments, the light source detection channels are provided in plurality, the main control board is in communication connection with each light source detection channel, and the main control board is used for acquiring light intensity data of the light beam with the maximum light intensity.
According to some embodiments, the system further comprises an upper computer which is in communication connection with the main control board so as to transmit instructions to the main control board.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for detecting pollutants in water, which comprises the steps of pretreating an acquired water sample, sequentially obtaining a plurality of classified and marked water samples to be detected, sequentially transmitting light beams emitted by a plurality of collimated LED light sources to one of the water samples to be detected, detecting the transmitted light beams, comparing and analyzing the detected wavelength data with preset wavelength data when the wavelength of the light beam of the collimated LED light source corresponds to the wavelength of one pollutant in the water sample to be detected, determining the pollutant type corresponding to the collimated LED light source, calibrating the rotation angle of the collimated LED light source, transmitting the calibrated collimated LED light source to the water sample to be detected again to obtain stable light beams, further measuring stable light intensity data to calculate the concentration of the corresponding pollutant, and sequentially detecting the light beams emitted by the plurality of collimated LED light sources corresponding to the water samples to be detected, wherein the plurality of classified and marked water samples to be detected are subjected to the detection, the type and the corresponding concentration of each pollutant in the water sample to be detected can be detected.
Furthermore, the method for detecting the pollutants in the water is realized by the device for detecting the pollutants in the water, and the device can be used for accurately detecting the type and the concentration of each pollutant in the water sample to be detected in real time within a short time without adding any optical filter and adopting a simple and small-volume structural design, so that the device has great economic benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a device for detecting contaminants in water according to the present invention;
FIG. 2 is a schematic view of a part of the structure of a device for detecting contaminants in water according to the present invention;
fig. 3 is a flowchart of a method for calibrating a rotation angle of a collimated LED light source in a method for detecting contaminants in water according to the present invention.
In the figure: the device comprises an optical detection flow cell 1, an LED array module 2, a motor 21, a circular circuit board 22, an LED light source 23 and a light source detection channel 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides a method for detecting pollutants in water, which comprises the steps of preprocessing an acquired water sample, sequentially obtaining a plurality of classified marked water samples to be detected, sequentially transmitting light beams emitted by a plurality of collimated LED light sources 23 to one of the water samples to be detected, detecting the transmitted light beams, comparing and analyzing detected wavelength data with preset wavelength data when the wavelength of the light beam of the collimated LED light source 23 corresponds to the wavelength of one pollutant in the water sample to be detected, determining the type of the pollutant corresponding to the collimated LED light source 23, calibrating the rotating angle of the collimated LED light source 23, transmitting the calibrated collimated LED light source 23 to the water sample again to be detected to obtain stable light beams, further measuring stable light intensity data to calculate the concentration of the corresponding pollutant, and then sequentially detecting the plurality of classified marked water samples to be detected and the light beams emitted by the plurality of collimated LED light sources 23, the type and the corresponding concentration of each pollutant in the water sample to be detected can be detected. Therefore, the method for detecting the pollutants in the water can accurately detect the type and the concentration of each pollutant in a water sample to be detected by means of a simple broad and common light source, and the specific scheme is as follows:
and S1, collecting water samples, pretreating pollutants in the collected water samples, and sequentially obtaining a plurality of different water samples to be detected.
S2, rotating the plurality of collimation LED light sources 23 which are arranged in an annular array and have the same light intensity and different wavelengths, enabling the light beam emitted by each collimation LED light source 23 to sequentially penetrate one of the water samples to be detected, detecting the penetrated light beam until the wavelength of the detected light beam corresponds to the wavelength of one pollutant in the water samples to be detected, stopping rotating and generating wavelength data of the light beam.
And S3, comparing the wavelength data of the light beam with a plurality of preset wavelength data, analyzing to determine the specified rotation angle of the collimated LED light source 23 corresponding to the light beam and the corresponding pollutant type, and calibrating the rotation angle of the collimated LED light source 23 according to the specified rotation angle.
And S4, measuring the light intensity data of the light beam of the calibrated collimated LED light source 23 penetrating the water sample to be detected, and calculating the concentration of the corresponding pollutant according to the light intensity data.
And S5, repeating the steps S2, S3 and S4 for each water sample to be detected in sequence to measure the type and concentration of each pollutant in the water sample to be detected.
The method comprises the steps of preprocessing various pollutants in a collected water sample, sequentially obtaining multiple water samples to be detected, dividing the collected water sample into multiple water samples, and performing digestion treatment and color development treatment on the pollutants in each water sample respectively to obtain the water samples to be detected, of which the multiple pollutants are classified and marked.
The plurality of collimating LED light sources 23 are sequentially enlarged from the low-waveband wavelength to the high-waveband wavelength and are arranged in an annular array, and the plurality of collimating LED light sources 23 cover the wavelength range of 350nm to 1000 nm.
In consideration of the fact that in practical application, the collimation LED light source 23 has inertia and is damped in the rotation process, a certain deviation exists between the actual rotation angle of the collimation LED light source 23 and the preset specified rotation angle, so that an error exists in the detection result of the pollutant in the water sample to be detected. In this embodiment, calibrating the rotation angle of the collimated LED light source 23 according to the specified rotation angle specifically includes substituting the specified rotation angle data and the actual rotation angle data of the collimated LED light source 23 into a PID algorithm for calculation and analysis, and calibrating the rotation angle of the collimated LED light source 23 according to an analysis result, where the PID algorithm is as follows:
A(k)＝A1-A0 (1)
in the formula (1), A1Is the actual rotation angle; a. the0Is a specified rotation angle; a (k) is a deviation value between the actual rotation angle and the designated rotation angle;
Figure BDA0003531513360000091
Figure BDA0003531513360000092
Figure BDA0003531513360000093
in formulae (2), (3) and (4), KpIs a proportionality coefficient, KiAs an integration constant, KdA differential constant, A (k) is the difference between the actual angle and the set angle, u (k) is the control quantity, u0To control the maximum value of the quantity, u1The control quantity is the minimum value, k is an integral control coefficient, delta is an error standard, and delta is set to prevent the wavelength conversion from losing control due to excessive integration when the error is too large.
As shown in FIG. 3, the encoder on the motor 21 driving the collimated LED light source 23 to rotate feeds back the actual rotation angle A in real time1Substituting the formula (1) to obtain an angle deviation value A (k), substituting the A (k) to the formulas (2) and (4), calculating to obtain a parameter u (k) for calibrating the rotation angle of the motor 21, substituting the parameter u (k) into the formula (3), and adjusting the motor 21 according to the finally output u (k) to realize the calibration of the rotation angle.
Specifically, three constants, K, of PID are setpControlling the actual rotation angle to fluctuate slightly around the specified angle, KdExerting a reverse action to lower KpFluctuation of parameters, effect of stabilizing light path, KiThe integral control enables the rotation angle to accurately reach the specified angle. u (k) calibrating the actual rotation angle of the collimated LED light source 23 by reducing the deviation of the actual rotation angle from the specified angle, and setting u0、u1The anti-interference capability of the system can be improved, and the light source can automatically adjust the corresponding rotation angle according to the set substance to be detected, so that the light path with the corresponding wavelength can stably and accurately enter the light inlet.
Absorption spectra are spectra that result from a substance absorbing a photon, thereby transitioning from a lower energy level to a more active, higher energy level. The energy difference between energy levels of different substances is different, the energy of the photon required to be absorbed is also different, and the photon which does not meet the energy difference between the two energy levels can not be absorbed according to the quantized absorption rule. The theory basis of the spectrophotometry is the light absorption law, namely Lambert-beer law, and a linear equation of absorbance and water quality parameter concentration can be established after the thickness of a fixed medium is 1 cm:
Figure BDA0003531513360000101
wherein A is the absorbance, I0For the intensity of incident light, I1In the case of transmitted light intensity, K is the absorption coefficient, C is the solution concentration (mol/L), and B is a constant.
The above formula illustrates the direct proportion relation between the absorbance A and the solution concentration C, the monochromatic light acts on the micro spectrometer after penetrating through the solution to be detected, and the absorbance A can be calculated by detecting the output of the micro spectrometer. Thus, the concentration value C of the solution to be measured can be obtained by measuring the value A.
To determine the relationship between A and C requires knowledge of the absorption coefficients of the equations. The analysis was carried out using a standard curve method. The standard solutions with various concentrations are respectively measured, and then a regression equation is obtained through a least square method.
It should be noted that the water is used as a medium for light propagation, and the above-mentioned method for detecting contaminants in water can also be applied to the method for detecting the kind and concentration of substances in other mediums, such as air, glass, etc. when light propagates through the medium.
Therefore, when the method for detecting pollutants in water is applied, the collected water sample is pretreated, a plurality of classified marked water samples to be detected are sequentially obtained, light beams emitted by the plurality of collimated LED light sources 23 sequentially transmit one of the water samples to be detected, the transmitted light beams are detected, when the wavelength of the light beam of the collimated LED light source 23 corresponds to the wavelength of one pollutant in the water sample to be detected, the detected wavelength data is compared with the preset wavelength data, the pollutant type corresponding to the collimated LED light source 23 can be determined, meanwhile, the rotation angle of the collimated LED light source 23 is calibrated, so that a stable light beam is obtained, stable light intensity data is further measured, the concentration of the corresponding pollutant is calculated, and then the light beams emitted by the plurality of collimated LED light sources 23 and sequentially corresponding to the water samples to be detected of a plurality of classified marks are detected, the type and corresponding concentration of each pollutant in the water sample to be detected can be detected. Therefore, the method for detecting the pollutants in the water can accurately detect the type and the concentration of each pollutant in the water sample to be detected by using a simple wide and common light source.
Example 2
The invention further provides a device for detecting pollutants in water, which can realize the method for detecting pollutants in water in embodiment 1, and as shown in fig. 1-2, the device for detecting pollutants in water comprises a pollutant treatment module, an optical detection flow cell 1, an LED array module 2, a light source detection channel 3 and a main control board (not shown in the figure). Wherein, pollutant processing module is used for carrying out pretreatment before detecting to the sewage of gathering.
Optical detection flow-through cell 1 is connected with pollutant processing module for treat the water sample after the circulation preliminary treatment, optical detection flow-through cell 1 is including going into light mouth and light-emitting window, and optical detection flow-through cell 1 still is equipped with inlet and liquid outlet with circulation liquid.
The LED array module 2 includes a motor 21, a circular circuit board 22, a plurality of collimating lenses and a plurality of LED light sources 23 which have the same light intensity and different wavelengths and are arranged on one side surface of the circular circuit board 22 in an annular array, each collimating lens (not shown in the figure) is correspondingly installed on each LED light source 23, a light path diverged by the LED light sources 23 is converted into a collimated parallel light beam, the motor 21 drives the circular circuit board 22 to rotate, and each LED light source 23 sequentially rotates to a light inlet.
The light source detection channel 3 is positioned at the light outlet to receive and detect the collimated parallel light beams penetrating through the water sample to be detected until the wavelength of the detected light beams corresponds to the wavelength of a pollutant in the water sample to be detected, namely wavelength data of the light beams are generated, wherein the optical detection channel can be understood as a part of mechanism on a spectrometer.
The main control board is in communication connection with the light source detection channel 3 and the motor 21, receives wavelength data and preset multiple wavelength data for comparison and analysis, determines a specified rotation angle at which a light beam should rotate and a corresponding pollutant type, an encoder of the motor 21 transmits actual rotation angle data of the LED light source 23 to the main control board, substitutes the specified rotation angle data and the actual rotation angle data of the collimation LED light source 23 into a PID algorithm for calculation and analysis, calibrates the rotation angle of the collimation LED light source 23 according to an analysis result, detects light intensity data of the light beam emitted by the collimated LED light source 23 after calibration through the light source detection channel 3 and sends the light intensity data to the main control board, and the main control board calculates the concentration of the corresponding pollutant according to the light intensity data.
In the above embodiment, the device for detecting pollutants in water pretreats the collected water sample through the pollutant treatment module to sequentially obtain a plurality of classified marked water samples to be detected, the motor 21 drives the plurality of collimated LED light sources 23 to rotate to control the wavelength conversion of the collimated LED light sources 23, the penetrating flow of the light beams emitted by the collimated LED light sources 23 sequentially and correspondingly penetrates through one water sample to be detected in the optical detection flow cell 1, the light source detection channel 3 receives the penetrating light beams and detects the penetrating light beams, when the wavelength of the light beams of the collimated LED light sources 23 is detected to correspond to the wavelength of one pollutant in the water sample to be detected, the detected wavelength data is transmitted to the main control board and is compared and analyzed with the wavelength data preset on the main control board, the pollutant type corresponding to the collimated LED light sources 23 can be determined, and the rotation angle of the collimated LED light sources 23 is calibrated at the same time, the collimated LED light sources 23 after calibration penetrate through the light beams of the water sample to be detected of the optical detection flow cell 1 to be detected, so that stable and accurate light intensity data can be measured, the concentration of the corresponding pollutants can be calculated, then the light beams which are sequentially corresponding to the water sample to be detected and are marked in a plurality of classification and emitted by the collimated LED light sources 23 are detected, and the type and the corresponding concentration of each pollutant in the water sample to be detected can be detected. Therefore, the device for detecting pollutants in water has a simple and small-volume structural design without adding any optical filter, can accurately detect the type and concentration of each pollutant in a water sample to be detected in real time in a short time, and has great economic benefits.
According to some embodiments, the device for detecting pollutants in water comprises a sampling module, wherein the sampling module comprises a peristaltic pump and a thin tube, and the main control board is connected with the peristaltic pump to control the flow rate of a water sample introduced into the pollutant treatment module and is used for introducing the water sample into the water quality detection module at a speed of 50-100 ul/min.
According to some embodiments, the contaminant processing module includes a plurality of water sample diversion pipes to divert the collected water samples into multiple fractions. And each water sample shunting pipeline is provided with a color development liquid cavity, a digestion liquid cavity, a color development liquid transfer pump and a digestion liquid transfer pump, the digestion liquid transfer pump is used for sequentially inputting digestion liquid in the digestion liquid cavity into each water sample to digest pollutants, and the color development liquid transfer pump is used for sequentially inputting color development liquid in the color development liquid cavity into the water sample of each water sample shunting pipeline to perform color development treatment on the digested pollutants.
According to some embodiments, the apparatus for detecting contaminants in water comprises a plurality of electromagnetic valves, which are respectively and correspondingly communicated with the outlet end of each water sample diversion pipeline and the inlet end of each optical detection flow cell 1.
When the wavelength conversion of the LED light source 23 is completed, the corresponding water sample distribution pipeline is opened by the electromagnetic valve to introduce the water sample to be detected for detection, and when the wavelength conversion of the light source is completed, the corresponding water sample distribution pipeline is opened to introduce the water sample to be detected for detection.
According to some embodiments, the light source detection channels 3 are provided in plurality, the main control board is in communication connection with each light source detection channel 3, and the main control board is used for acquiring light intensity data of the light beam with the maximum light intensity. The main control board continuously receives the signals transmitted by each light source detection channel 3, compares the signals with the original signals to obtain the maximum light intensity and the corresponding light source detection channel 3, and if the light path calibration is completed, the motor 21 is locked to maintain the stability of the light path, so that the wavelength of the light source to be detected corresponds to the wavelength required by the pollutant to be detected, and corresponding data is sent to the main control board to calculate the concentration, thereby realizing the rapid detection of the pollutant.
According to some embodiments, the device for detecting pollutants in water further comprises an upper computer in communication connection with the main control board, and the main control board sends detected data to the upper computer and receives instructions sent by the upper computer.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Claims (10)

1. A method for detecting pollutants in water is characterized by comprising the following steps:
s1, collecting a water sample, pretreating pollutants in the collected water sample, and sequentially obtaining a plurality of classified marked water samples to be detected;
s2, rotating a plurality of collimation LED light sources which are arranged in an annular array and have the same light intensity and different wavelengths, sequentially transmitting light beams emitted by the collimation LED light sources to one of the water samples to be detected, detecting the transmitted light beams until the wavelength of the light beams is detected to correspond to the wavelength of one pollutant in the water samples to be detected, and stopping rotating the collimation LED light sources and generating wavelength data of the light beams;
s3, comparing and analyzing the wavelength data with a plurality of preset wavelength data to determine the specified rotation angle of the collimation LED light source corresponding to the light beam and the corresponding pollutant type, and calibrating the rotation angle of the collimation LED light source according to the specified rotation angle;
s4, measuring the light intensity data of the light beam of the collimated LED light source which is calibrated and penetrates through the water sample to be detected, and calculating the concentration of the corresponding pollutant;
and S5, repeating the steps S2, S3 and S4 for each water sample to be detected with the classification mark, so as to measure the type and concentration of each pollutant in the water sample to be detected.
2. A method for detecting contaminants in water according to claim 1,
the collection water sample is to the multiple pollutant in the water sample of gathering carry out the preliminary treatment, obtains the water sample that waits to detect of many shares in proper order, specifically includes: dividing the collected water sample into multiple water samples, and performing digestion treatment and color development treatment on pollutants in each water sample respectively to obtain multiple classification labeled water samples to be detected.
3. A method for detecting contaminants in water according to claim 2,
the plurality of collimation LED light sources are sequentially enlarged from low-waveband wavelengths to high-waveband wavelengths and are arranged in an annular array, and the plurality of collimation LED light sources cover the wavelength range of 350nm-1000 nm.
4. The method of claim 3, wherein the calibrating the rotation angle of the collimated LED light source according to the specified rotation angle comprises,
substituting the specified rotation angle data and the actual rotation angle data of the collimation LED light source into a PID algorithm for calculation and analysis, and calibrating the rotation angle of the collimation LED light source according to an analysis result, wherein the PID algorithm is as follows:
A(k)＝A1-A0 (1)
in the formula (1), A1Is the actual rotation angle; a. the0Is a specified rotation angle; a (k) is a deviation value between the actual rotation angle and the designated rotation angle;
Figure FDA0003531513350000021
Figure FDA0003531513350000022
Figure FDA0003531513350000023
in formulae (2), (3) and (4), KpIs a proportionality coefficient, KiAs an integration constant, KdA differential constant, A (k) is the difference between the actual angle and the set angle, u (k) is the control quantity, u0As maximum value of the control quantity, u1Is the minimum value of the control quantity, k is the integral control coefficient, and delta is the error standard.
5. An apparatus for detecting contaminants in water according to the method for detecting contaminants in water of any one of claims 1 to 4, comprising:
the pollutant treatment module is used for carrying out pretreatment before detection on the collected sewage to sequentially obtain a plurality of classified and marked water samples to be detected;
the optical detection flow cell is connected with the pollutant treatment module and is used for circulating the pretreated water sample to be detected, and the optical detection flow cell comprises a light inlet and a light outlet;
the LED array module comprises a motor, a circular circuit board, a plurality of collimating lenses and a plurality of LED light sources which have the same light intensity and different wavelengths and are arranged on one side surface of the circular circuit board in an annular array manner, wherein each collimating lens is correspondingly arranged on each LED light source respectively, so that light paths diverged by the LED light sources are converted into collimated parallel light beams, the motor drives the circular circuit board to rotate, and each LED light source sequentially rotates to the light inlet;
the light source detection channel is positioned at the light outlet and used for receiving and detecting the collimated parallel light beam penetrating through the water sample to be detected until the wavelength of the light beam is detected to correspond to the wavelength of a pollutant in the water sample to be detected, and wavelength data of the light beam is generated;
the main control board is in communication connection with the light source detection channel and the motor, receives the wavelength data and performs contrastive analysis on a plurality of preset wavelength data to determine the specified rotation angle of the light beam to rotate and the corresponding pollutant types, the encoder of the motor transmits the actual rotation angle data of the LED light source to the main control board, substitutes the specified rotation angle data and the actual rotation angle data of the collimation LED light source into a PID algorithm to perform calculation and analysis, calibrates the rotation angle of the collimation LED light source according to an analysis result, measures the light intensity data of the light beam emitted by the collimation LED light source after calibration by the light source detection channel and transmits the light intensity data to the main control board, and the main control board calculates the concentration of the corresponding pollutant according to the light intensity data.
6. A device for detecting contaminants in water according to claim 5,
still include the sampling module, the sampling module includes peristaltic pump and tubule, the main control board with the peristaltic pump is connected in order to control the water sample and lets in the velocity of flow of pollutant processing module.
7. A device for detecting contaminants in water according to claim 6,
the pollutant treatment module comprises a plurality of water sample distribution pipelines so as to distribute the collected water samples into a plurality of parts;
each water sample shunting pipeline is provided with a color development liquid cavity, a digestion liquid cavity, a color development liquid infusion pump and a digestion liquid infusion pump, the digestion liquid infusion pump is used for sequentially inputting digestion liquid in the digestion liquid cavity into each water sample to digest pollutants, and the color development liquid infusion pump is used for sequentially inputting color development liquid in the color development liquid cavity into the water sample of each water sample shunting pipeline to perform color development treatment on the digested pollutants.
8. A device for detecting contaminants in water according to claim 7,
the water sample distribution device also comprises a plurality of electromagnetic valves which are respectively and correspondingly communicated with the outlet end of each water sample distribution pipeline and the liquid inlet end of each optical detection flow cell;
and when the wavelength conversion of the LED light source is completed, the electromagnetic valve opens the corresponding water sample diversion pipeline and introduces the water sample to be detected for detection.
9. A device for detecting contaminants in water according to claim 8,
the light source detection channels are multiple, the main control board is in communication connection with each light source detection channel, and the main control board is used for obtaining light intensity data of the light beam with the maximum light intensity.
10. An apparatus for detecting contaminants in water according to claim 9,
the system also comprises an upper computer which is in communication connection with the main control board and transmits instructions to the main control board.
CN202210212752.9A 2022-03-04 2022-03-04 Method and device for detecting pollutants in water Pending CN114577742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210212752.9A CN114577742A (en) 2022-03-04 2022-03-04 Method and device for detecting pollutants in water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210212752.9A CN114577742A (en) 2022-03-04 2022-03-04 Method and device for detecting pollutants in water

Publications (1)

Publication Number Publication Date
CN114577742A true CN114577742A (en) 2022-06-03

Family

ID=81778960

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210212752.9A Pending CN114577742A (en) 2022-03-04 2022-03-04 Method and device for detecting pollutants in water

Country Status (1)

Country Link
CN (1) CN114577742A (en)

Similar Documents

Publication Publication Date Title
CN109799203B (en) Wide-range high-precision spectrum detection method for COD concentration in water body
CN100541171C (en) The method of ultraviolet cooperating with ozone measuring water body total nitrogen and total phosphorous by digestion spectrophotometry
CN106596436B (en) Multi-parameter water quality real-time online monitoring device based on spectrum method
CN110887801B (en) Device and method for carrying out long-time in-situ detection on complex water body based on spectrum method
CN100543455C (en) Ozone oxidation and ultraviolet scanning spectrum integral way is measured the method for total organic carbon
CN104903702A (en) Multiple wavelength light source for colorimetric measurement
CN115931451B (en) Sampling analysis unit suitable for surface water monitoring
CN116148200B (en) Water quality analyzer
CN110987845A (en) Real-time detection method for dye concentration in single-component and double-component dye solutions
CN114577742A (en) Method and device for detecting pollutants in water
CN115290587A (en) Multichannel solution concentration detection method and device based on hollow optical fiber
CN114460022B (en) Towed hyperspectral absorbance sensor system and correction method thereof
CN212180619U (en) Pipeline type full spectrum water quality detection device
CN114136883A (en) Detection system and method for multivalent plutonium element in nuclear fuel reprocessing
CN113189032A (en) Water quality online detection system and detection method based on liquid core waveguide
CN114778452B (en) Spectrophotometer with adjustable detection range and substance concentration detection method
CN215812392U (en) Portable spectrum method water quality detection sensor
CN219715235U (en) Non-dispersive infrared bi-component concentration monitoring device for methane and carbon dioxide
CN109238996A (en) A kind of real-time online continuously monitors the device and its application method of nitrate concentration
CN216051366U (en) Water quality on-line detection system based on liquid core waveguide
CN220019343U (en) Groundwater nitrate sensing system of spiral waveguide
CN219552237U (en) Gas absorption tank and carbon dioxide gas analyzer with same
CN203479695U (en) Instrument for on-line measurement of concentration of TMC (trimesoyl chloride) in organic solution
CN219777487U (en) Gas high-sensitivity detection device using integrating sphere
CN108760710B (en) F-P cavity enhancement-based water pollution online monitoring device and application method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination