CN-121540695-B - Spectrum measurement method, system and equipment for chemical industrial wastewater

CN121540695BCN 121540695 BCN121540695 BCN 121540695BCN-121540695-B

Abstract

The invention relates to the technical field of optical testing, in particular to a spectrum measuring method, a spectrum measuring system and spectrum measuring equipment for chemical industrial wastewater. The method comprises the steps of obtaining a spectrum curve of electrolytic zinc wastewater, obtaining metal expression degree according to the shape of the spectrum curve in a wave peak section, screening out the metal wave peak section, obtaining zinc interference degree of the metal wave peak section according to the distribution condition of spectrum intensity in the metal wave peak section and the distance between the metal wave peak section and a wave peak section corresponding to zinc element, correcting the metal expression degree of the metal wave peak section according to the zinc interference degree, obtaining corrected metal expression degree, and further obtaining the true concentration of each metal component in the electrolytic zinc wastewater. According to the invention, the interference of the spectral signals corresponding to the zinc element in the electrolytic zinc wastewater on the spectral signals corresponding to other metal elements is effectively reduced by obtaining the modified metal expression degree, so that the true concentration of each metal component is accurately obtained, and whether the electrolytic zinc wastewater reaches the discharge standard is accurately judged.

Inventors

HUANG LING
QIU JIXIA
ZHANG GUIYUE
ZHANG XUE
LIU XUEJIAO
WANG HUAI
ZHANG BINGYUAN
SHI SHENGLI

Assignees

北京光合列特科技有限公司

Dates

Publication Date: 20260508
Application Date: 20251204

Claims (9)

1. The spectrum measurement method of the chemical industrial wastewater is characterized by comprising the following steps of: acquiring a spectrum curve of the electrolytic zinc wastewater; according to the shape of the spectrum curve in each wave peak section, obtaining the metal expression degree of each wave peak section; obtaining the zinc interference degree of each metal wave peak section according to the distribution condition of the spectrum intensity in each metal wave peak section and the distance between each metal wave peak section and the corresponding wave peak section of the zinc element; correcting the metal expression degree of each metal wave peak section according to the zinc interference degree to obtain the corrected metal expression degree of each metal wave peak section; Based on the modified metal expression degree, obtaining the actual concentration of each metal component in the electrolytic zinc wastewater; the method for obtaining the metal expression degree comprises the following steps: Regarding any wave peak section, taking the spectrum intensity corresponding to the wave peak in the wave peak section as the target spectrum intensity; taking two corresponding wavelengths of half of the target spectrum intensity in the wave peak section as reference wavelengths; Taking the difference value between the wavelength corresponding to the target spectrum intensity and the reference wavelength positioned at the left side of the target spectrum intensity as a first value; Taking the difference value between the reference wavelength positioned on the right side of the corresponding wavelength of the target spectrum intensity and the corresponding wavelength of the target spectrum intensity as a second value; a result of inversely correlating and normalizing the difference between the first value and the second value is used as the symmetry degree of the peak section; Taking the difference of the two reference wavelengths as the reference width of the peak section; Taking the ratio of the target spectrum intensity to the reference width as the peak expression degree of the peak section; and normalizing the product of the symmetry degree and the peak expression degree to obtain the metal expression degree of the peak section.
2. The spectrometry method for industrial wastewater of chemical industry according to claim 1, wherein the method for obtaining the metal wave peak section comprises the following steps: When the metal expression degree is larger than a preset metal expression degree threshold, the corresponding wave peak section is taken as a metal wave peak section.
3. The spectrometry method for chemical industrial wastewater according to claim 1, wherein the method for obtaining the zinc interference degree is as follows: according to the distribution condition of the spectrum intensity in each metal wave peak section, obtaining the error degree of each metal wave peak section; obtaining the difference between the wavelength corresponding to the wave crest in each metal wave crest section and the wavelength corresponding to the wave crest in the wave crest section corresponding to the zinc element as the reference distance of each metal wave crest section; and normalizing the product of the result of the negative correlation of the reference distance of each metal wave peak section and the error degree to obtain the zinc interference degree of each metal wave peak section.
4. A method for spectrometric determination of chemical industrial wastewater as defined in claim 3, wherein said error degree obtaining method comprises: regarding any metal wave peak section, taking the wavelength corresponding to the wave peak of the metal wave peak section as a target wavelength; Taking the spectrum intensities corresponding to the target wavelength and the preset number of neighborhood wavelengths as reference spectrum intensities; for any reference spectrum intensity, the concentration of the metal component corresponding to the metal wave peak section is obtained through the reference spectrum intensity and is used as the reference concentration; Obtaining a standard spectrum curve of a metal component corresponding to the metal wave peak section under a reference concentration as a specific spectrum curve; Acquiring the average value of spectrum intensity differences corresponding to all wavelengths in the metal wave peak section and the same wavelength on a specific spectrum curve, and taking the average value as the reference error degree corresponding to the metal wave peak section under the reference spectrum intensity; And obtaining the corresponding reference error degree of the metal wave peak section under each reference spectrum intensity, and taking the minimum reference error degree as the error degree of the metal wave peak section.
5. The spectrometry method for chemical industrial wastewater according to claim 1, wherein the method for obtaining the modified metal expression level comprises the steps of: For any metal wave peak section, the result of carrying out negative correlation on the zinc interference degree of the metal wave peak section is taken as the correction weight of the metal wave peak section; and taking the product of the correction weight and the metal expression degree of the metal wave peak section as the correction metal expression degree of the metal wave peak section.
6. The spectrometry method for chemical industrial wastewater according to claim 1, wherein the method for obtaining the true concentration of each metal component in the electrolytic zinc wastewater based on the modified metal expression level comprises the steps of: For any metal component in the electrolytic zinc wastewater, obtaining standard spectrum curves of the metal component under different concentrations, correlating spectrum data of each standard spectrum curve with corresponding concentrations through a partial least squares regression method, and establishing a standard mathematical model of the metal expression degree and the concentration of the metal component; Substituting the modified metal expression degree of the metal component into a standard mathematical model to obtain the true concentration of the metal component in the electrolytic zinc wastewater.
7. The spectrometry method for industrial wastewater of chemical industry according to claim 1, wherein the method for obtaining the wave band is as follows: the method comprises the steps of obtaining wave crests and wave troughs in a spectrum curve, and taking wave bands formed by wavelengths corresponding to two wave troughs adjacent to each wave crest left and right as wave crest bands.
8. A spectrometry system for chemical process wastewater, the system comprising: the acquisition module is used for acquiring a spectrum curve of the electrolytic zinc wastewater; the metal peak section acquisition module is used for acquiring the metal expression degree of each peak section according to the shape of the spectrum curve in each peak section; The zinc interference degree acquisition module is used for acquiring the zinc interference degree of each metal wave peak section according to the distribution condition of the spectrum intensity in each metal wave peak section and the distance between each metal wave peak section and the corresponding wave peak section of the zinc element; the corrected metal expression degree acquisition module is used for correcting the metal expression degree of each metal wave peak section according to the zinc interference degree to acquire the corrected metal expression degree of each metal wave peak section; The real concentration acquisition module is used for acquiring the real concentration of each metal component in the electrolytic zinc wastewater based on the corrected metal expression degree; the method for obtaining the metal expression degree comprises the following steps: Regarding any wave peak section, taking the spectrum intensity corresponding to the wave peak in the wave peak section as the target spectrum intensity; taking two corresponding wavelengths of half of the target spectrum intensity in the wave peak section as reference wavelengths; Taking the difference value between the wavelength corresponding to the target spectrum intensity and the reference wavelength positioned at the left side of the target spectrum intensity as a first value; Taking the difference value between the reference wavelength positioned on the right side of the corresponding wavelength of the target spectrum intensity and the corresponding wavelength of the target spectrum intensity as a second value; a result of inversely correlating and normalizing the difference between the first value and the second value is used as the symmetry degree of the peak section; Taking the difference of the two reference wavelengths as the reference width of the peak section; Taking the ratio of the target spectrum intensity to the reference width as the peak expression degree of the peak section; and normalizing the product of the symmetry degree and the peak expression degree to obtain the metal expression degree of the peak section.
9. A spectrometric device for chemical production wastewater comprising a memory, a processor and a computer program stored in said memory and running on said processor, characterized in that said processor, when executing said computer program, realizes the steps of a spectrometric method for chemical production wastewater according to any of the preceding claims 1-7.

Description

Spectrum measurement method, system and equipment for chemical industrial wastewater Technical Field The invention relates to the technical field of optical testing, in particular to a spectrum measuring method, a spectrum measuring system and spectrum measuring equipment for chemical industrial wastewater. Background The electrolytic zinc wastewater is wastewater generated in the zinc production process, when the concentration of zinc ions in the electrolytic zinc wastewater is too high, the recovery efficiency of zinc is low, the zinc ions in the wastewater are deposited by electrochemical reaction again, and the electrolytic zinc wastewater is discharged until the concentration of various metal components in the electrolytic zinc wastewater reaches the discharge standard, so that the metal components in the electrolytic zinc wastewater are required to be accurately detected and analyzed. In the prior art, quantitative analysis is carried out on metal elements in electrolytic zinc wastewater by an inductively coupled plasma emission spectrometry technology, the electrolytic zinc wastewater emits light with specific wavelength under the condition of excitation or heating, the composition and the content of metal components in the electrolytic zinc wastewater are reflected, and the metal components and the content thereof in the electrolytic zinc wastewater are identified by measuring the wavelength and the intensity of the light in the spectrometry technology. However, in actual situations, the spectrum signals corresponding to the zinc ions under the specific wavelength overlap with the spectrum signals corresponding to other metal elements, so that the concentration detection of the metal components in the electrolytic zinc wastewater is inaccurate, and whether the electrolytic zinc wastewater reaches the discharge standard cannot be accurately judged. Disclosure of Invention In order to solve the technical problem that the concentration detection of metal components in electrolytic zinc wastewater is inaccurate because a spectrum signal corresponding to zinc ions at a specific wavelength is overlapped with spectrum signals corresponding to other metal elements, the invention aims to provide a spectrum measuring method, a system and equipment for chemical industrial wastewater, wherein the adopted technical scheme is as follows: in a first aspect, an embodiment of the present invention provides a spectrometry method for chemical industrial wastewater, the method comprising the steps of: acquiring a spectrum curve of the electrolytic zinc wastewater; according to the shape of the spectrum curve in each wave peak section, obtaining the metal expression degree of each wave peak section; obtaining the zinc interference degree of each metal wave peak section according to the distribution condition of the spectrum intensity in each metal wave peak section and the distance between each metal wave peak section and the corresponding wave peak section of the zinc element; correcting the metal expression degree of each metal wave peak section according to the zinc interference degree to obtain the corrected metal expression degree of each metal wave peak section; based on the corrected metal expression level, the true concentration of each metal component in the electrolytic zinc wastewater is obtained. Further, the method for obtaining the metal expression degree comprises the following steps: Regarding any wave peak section, taking the spectrum intensity corresponding to the wave peak in the wave peak section as the target spectrum intensity; taking two corresponding wavelengths of half of the target spectrum intensity in the wave peak section as reference wavelengths; Taking the difference value between the wavelength corresponding to the target spectrum intensity and the reference wavelength positioned at the left side of the target spectrum intensity as a first value; Taking the difference value between the reference wavelength positioned on the right side of the corresponding wavelength of the target spectrum intensity and the corresponding wavelength of the target spectrum intensity as a second value; a result of inversely correlating and normalizing the difference between the first value and the second value is used as the symmetry degree of the peak section; Taking the difference of the two reference wavelengths as the reference width of the peak section; Taking the ratio of the target spectrum intensity to the reference width as the peak expression degree of the peak section; and normalizing the product of the symmetry degree and the peak expression degree to obtain the metal expression degree of the peak section. Further, the method for obtaining the metal wave peak section comprises the following steps: When the metal expression degree is larger than a preset metal expression degree threshold, the corresponding wave peak section is taken as a metal wave peak section. Further, the method for obtaining th