A system and method for detecting pollutants in recycled water

Abstract

The present invention provides a reclaimed water pollutant detection system, including a pollutant database for storing the compound categories corresponding to various pollutants in reclaimed water; a pollutant detection subsystem for obtaining reclaimed water samples to be tested in the area to be tested and testing the samples; a feature generation subsystem for obtaining the distribution characteristics of pollutants in the reclaimed water in the area to be tested according to the water distribution coefficients corresponding to various compounds. The present invention counts the compounds in the reclaimed water, and provides an effective reference for the subsequent detection process by comparing the types and concentrations of pollutants in reclaimed water from different sources and different treatment processes; by calculating the retention time of the components of the compounds corresponding to the pollutants, it is convenient to evaluate the impact of different pollutants on the environment and to reasonably use reclaimed water with different pollution levels; the distribution characteristics of different pollutants are obtained according to the water distribution coefficients, and the potential risks of pollutants to the environment are more accurately evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and in particular to a system and method for detecting pollutants in recycled water. Background Art

[0002] Urban sewage regeneration refers to the process of purifying urban sewage in accordance with certain water quality standards or water quality requirements by adopting corresponding technical methods to restore its specific use function and safety. This process mainly includes water quality regeneration, water volume recovery and effective control of pathogens. The use of recycled water is one of the effective ways to increase revenue and reduce expenditure, reduce water pollution, improve the ecological environment and solve urban water shortage. It can not only alleviate the problem of water shortage, but also improve the utilization rate of water resources and promote the sustainable development of cities.

[0003] Pollutant detection is a necessary means in the process of sewage regeneration. Pollutants in recycled water are detected and treated to ensure that the water quality meets the corresponding standards and avoid harm to the environment and human health. However, due to the wide range of sources of urban recycled water, recycled water from different sources often contains different types of pollutants, and traditional detection methods are often cumbersome, requiring a lot of time and manpower, and are easily affected by human factors. At the same time, the detection ability for new pollutants or trace pollutants is relatively weak, which affects the accuracy and reliability of the test results. It cannot meet the needs of rapid and accurate detection of recycled water quality. At the same time, it is difficult to obtain the distribution range of urban recycled water pollutants based on traditional test results. Summary of the invention

[0004] In view of this, the present invention proposes a recycled water pollutant detection system and method to solve the technical problems of existing recycled water detection technology, namely, "time-consuming and labor-intensive, poor detection accuracy, and difficulty in targeting multiple pollutants", and to achieve the purpose of obtaining the distribution range of different recycled water pollutants in various urban areas.

[0005] On the one hand, to achieve the above-mentioned purpose, the present invention proposes a reclaimed water pollutant detection system, comprising a pollutant database, a pollutant detection subsystem, and a feature generation subsystem connected in sequence;

[0006] The pollutant database is used to store the compound categories corresponding to various pollutants in the reclaimed water;

[0007] The pollutant detection subsystem is used to obtain a sample of reclaimed water to be tested in the area to be tested and to test the sample to be tested, so as to obtain the water distribution coefficient corresponding to various compounds in the reclaimed water;

[0008] The feature generation subsystem is used to obtain the distribution characteristics of pollutants in the reclaimed water of the area to be detected according to the water distribution coefficients corresponding to various compounds.

[0009] Optionally, the pollutant database includes a base database and a detection calculation module, the base database adopts a Compound Composer database, and the compound categories in the Compound Composer database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds; the pollutant database also includes the initial retention time and mass spectrum marking of each category of compounds;

[0010] The detection calculation module calculates the actual retention time of normal alkanes before and after each category of compounds, and obtains the current retention time of normal alkanes before and after the compounds corresponding to the pollutants in the water sample to be tested, and then corrects the initial retention time of each category of compounds stored in the base database.

[0011] Optionally, the pollutant detection module includes a sampling module, a sample processing module, and a mass spectrometry detection module. The sampling module is used to sample the regenerated water in the detection area to obtain the regenerated water sample. The sample processing module uses a solid phase extraction column to pre-treat the regenerated water sample to obtain the sample to be tested; the mass spectrometry detection module includes a plurality of mass spectrometers, which are used to scan the sample to be tested to obtain mass spectrometry data of various compounds, and the mass spectrometry data is input into the pollutant database. The qualitative and quantitative detection results of various compounds in the sample to be tested are obtained through the mass spectrometry markings and the mass spectrometry data; the qualitative and quantitative detection results include the water distribution coefficient of various compounds.

[0012] Optionally, the feature generation subsystem obtains the sampling sources and water distribution coefficients of different samples to be tested in the pollutant detection subsystem, and obtains the concentration ratios of the compounds corresponding to each type of pollutant in the samples to be tested based on the water distribution coefficients, and generates pollutant distribution charts for different urban areas based on the sampling sources and the concentration ratios, thereby obtaining the distribution characteristics of various pollutants in urban recycled water.

[0013] On the other hand, to achieve the above-mentioned purpose, the present invention proposes a method for detecting pollutants in recycled water, comprising:

[0014] Construct a base database to store the types of pollutant compounds, initial retention time and mass spectrum lines in recycled water;

[0015] Obtain a sample of reclaimed water to be tested in the area to be tested and test the sample to be tested to obtain the water distribution coefficient of various compounds in the reclaimed water;

[0016] Calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutants in the sample to be tested, and correcting the initial retention time of each type of compound stored in the base database;

[0017] The distribution characteristics of various pollutants in urban recycled water are obtained based on the water distribution coefficient.

[0018] Optionally, the base database adopts a Compound Composer database, and the categories of pollutant compounds in the base database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds.

[0019] Optionally, the process of obtaining a reclaimed water sample to be tested from a region to be tested and testing the sample to be tested includes:

[0020] After sampling the reclaimed water in the area to be tested, a solid phase extraction column is used to pre-treat the collected water sample to obtain the sample to be tested;

[0021] The sample to be tested is tested with a mass spectrometer to obtain mass spectrum data of the sample to be tested, the mass spectrum data is input into the base database, and the compound category and the corresponding water distribution coefficient in the sample to be tested are obtained based on the mass spectrum lines of various compounds stored in the base database.

[0022] Optionally, in the process of pre-testing the collected water samples using a solid phase extraction column, the absorption efficiency of different types of fillers in the solid phase extraction column for each type of pollutant is obtained, and an absorption efficiency threshold is set. Filler types whose absorption efficiency exceeds the absorption efficiency threshold are combined to obtain a solid phase extraction column with a combined filler, and the collected water samples are pre-treated based on the solid phase extraction column with the combined filler.

[0023] Optionally, the process of calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutant in the sample to be tested includes:

[0024] Obtaining the initial retention time of the normal alkanes before and after the compounds corresponding to each type of pollutants in the sample to be tested in the base database, and the current retention time of the compounds corresponding to each type of pollutants;

[0025] The predicted retention time is obtained by performing calculation based on the initial retention time and the current retention time.

[0026] Optionally, the process of obtaining the distribution characteristics of various pollutants in urban recycled water based on the water distribution coefficient includes:

[0027] Based on the water distribution coefficient, the concentration ratio of the compounds corresponding to each type of pollutant in the sample to be tested is obtained, and the sampling source of the recycled water in the sample to be tested is counted;

[0028] Generate pollutant distribution charts for different urban areas based on the sampling sources and the concentration ratios;

[0029] The distribution characteristics of various pollutants in urban recycled water are obtained based on the pollutant distribution chart.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention constructs a base database to count all toxic semi-volatile compounds in reclaimed water, and provides an effective reference for the subsequent detection process by comparing the types and concentrations of pollutants in reclaimed water from different sources and different treatment processes; by calculating the retention time of the components of the compounds corresponding to the pollutants, it is convenient to evaluate the impact of different pollutants on environmental factors such as aquatic ecosystems, soil and groundwater, and to reasonably use reclaimed water with different pollution levels; by using solid phase extraction fillers in different types of combinations, the applicability of reclaimed water detection is improved, effectively saving costs; the distribution characteristics of different pollutants are obtained according to the water distribution coefficient, and the potential risks of pollutants to the environment are more accurately evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 is a structural diagram of a reclaimed water pollutant detection system in an embodiment of the present invention;

[0034] Figure 2 is a structural diagram of a pollutant detection subsystem in an embodiment of the present invention;

[0035] Figure 3 Flow chart of the method for detecting pollutants in recycled water in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Embodiment 1

[0038] This embodiment proposes a reclaimed water pollutant detection system. Figure 1 As shown, it includes a pollutant database, a pollutant detection subsystem, and a feature generation subsystem connected in sequence; wherein the specific functions of each subsystem include:

[0039] The pollutant database is used to store the compound categories corresponding to various pollutants in the reclaimed water;

[0040] In some embodiments, the pollutant database includes a base database and a detection calculation module, wherein the base database adopts a Compound Composer database, and the compound categories in the Compound Composer database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds;

[0041] Furthermore, CH-containing compounds include aliphatic compounds, benzene compounds, polycyclic compounds, polychlorinated biphenyl compounds, etc.; CHO-containing compounds include ether compounds, ketone compounds, phenol compounds, phthalate compounds, fatty acid compounds; nitrogen-containing compounds include aromatic amine compounds, quinoline compounds, nitro compounds, nitrosamine compounds; pesticide compounds include insecticides, fungicides, herbicides, etc.;

[0042] In addition, the pollutant database also includes the initial retention time and mass spectrum of each category of compounds;

[0043] It can be understood that this embodiment establishes a database to count all toxic semi-volatile compounds in reclaimed water, and provides an effective reference for subsequent detection processes by comparing the types and concentrations of pollutants in reclaimed water from different sources and different treatment processes. It can also study the migration and transformation laws of pollutants and further obtain the distribution characteristics of different types of pollutants in the city.

[0044] In some embodiments, the detection calculation module calculates the actual retention time of n-alkanes before and after each type of compound, and obtains the current retention time of n-alkanes before and after the compound corresponding to the pollutant in the water sample to be tested, and then corrects the initial retention time of each type of compound stored in the base database. The specific calculation method is as follows:

[0045] HT T' =(HT T -HT Cn )*(HT C'n+1 -HT C'n ) / (HT Cn+1 -HT Cn )

[0046] Among them, HT T' is the predicted retention time of a compound in the sample to be tested, HT T is the retention time of the compound in the database, HT Cn and HT Cn+1 is the retention time of the n-alkanes before and after the compound in the database, HT C'n and HT C'n+1 are the current retention times of the compounds respectively.

[0047] It can be understood that this embodiment calculates the retention time of various pollutants in reclaimed water through the normal alkanes of the compounds, which can help decision makers evaluate the potential risks of pollutants in water to the environment, accurately predict and evaluate the impact of different pollutants on environmental factors such as aquatic ecosystems, soil and groundwater. At the same time, decision makers can use different types of reclaimed water for different scenarios according to the retention time of different compounds. Reclaimed water with a shorter retention time can be used for purposes with broader water quality requirements, such as urban landscaping, irrigation, etc. Reclaimed water with a longer retention time can be strictly treated and used as industrial water, etc., so as to achieve the rational use of reclaimed water.

[0048] In some embodiments, the pollutant detection subsystem is used to obtain a sample of reclaimed water to be tested in the area to be tested and to test the sample to be tested, so as to obtain the water distribution coefficient corresponding to various compounds in the reclaimed water;

[0049] Furthermore, if Figure 2As shown, the pollutant detection module includes a sampling module, a sample processing module, and a mass spectrometry detection module. In the sampling and detection process of urban recycled water, the recycled water in the detection area is sampled by the sampling module to obtain the recycled water sample, and the sample processing module uses a solid phase extraction column to pre-treat the recycled water sample to obtain the sample to be tested; the mass spectrometry detection module includes a plurality of mass spectrometers, and the mass spectrometers are used to scan the sample to be tested to obtain the mass spectrometry data of various compounds, and finally the mass spectrometry data is input into the base database in the pollutant database, and the mass spectrometry lines stored in the base database are compared with the mass spectrometry data to obtain the qualitative and quantitative detection results of various compounds in the sample to be tested; the qualitative and quantitative detection results include the water distribution coefficient of various compounds.

[0050] It is worth noting that in this embodiment, recycled water from different areas of the city is sampled and tested respectively. Therefore, the number of the above-mentioned recycled water samples and samples to be tested is several, corresponding to the recycled water sources in different urban areas. By performing mass spectrometry detection on several samples to be tested corresponding to different areas and inputting the detection results into the detection calculation module, the qualitative and quantitative detection results of pollutants corresponding to each area can be effectively obtained.

[0051] Furthermore, in the process of using a solid phase extraction column to treat reclaimed water samples, since different types of solid phase extraction column fillers have different absorption efficiencies for different pollutants, and the samples to be tested in this embodiment include reclaimed water samples from different sources, the types and proportions of pollutants in each group of reclaimed water samples are also different. Therefore, in order to improve the absorption efficiency of pollutants, this embodiment sets an absorption efficiency threshold, and compares the absorption efficiency of different types of fillers for different compounds with the set absorption efficiency threshold, and combines filler types whose absorption efficiency exceeds the absorption efficiency threshold, and finally obtains a solid phase extraction column using a combined filler, and pre-treats the collected water samples based on the solid phase extraction column with the combined filler to enhance the applicability of detecting reclaimed water containing different pollutants.

[0052] In some embodiments, the feature generation subsystem is used to obtain the distribution characteristics of pollutants in the reclaimed water of the area to be detected based on the water distribution coefficients corresponding to various types of compounds.

[0053] Furthermore, the feature generation subsystem obtains the sampling sources of different samples to be tested through the sampling module in the pollutant detection subsystem, and obtains the water distribution coefficients of the compounds in different samples through the pollutant database, obtains the concentration ratios of the compounds corresponding to each type of pollutant in the samples to be tested according to the water distribution coefficient, and finally generates pollutant distribution charts for different urban areas according to the obtained sampling sources and the corresponding compound concentration ratios, and obtains the distribution characteristics of various pollutants in urban recycled water through the pollutant distribution charts.

[0054] It can be understood that this embodiment, by obtaining the distribution characteristics of each category of pollutants, can reflect their migration, transformation and accumulation patterns in the environment, more accurately assess the potential risks of pollutants to the environment, and thus formulate more targeted recycled water utilization and treatment measures. By targeting the distribution characteristics of different pollutants, decision makers can formulate different utilization strategies and management measures to maximize the utilization value of recycled water.

[0055] Embodiment 2

[0056] This embodiment proposes a method for detecting pollutants in recycled water. Figure 3 As shown, the following steps are included:

[0057] Construct a base database to store the types of pollutant compounds, initial retention time and mass spectrum lines in recycled water;

[0058] Obtain a sample of reclaimed water to be tested in the area to be tested and test the sample to be tested to obtain the water distribution coefficient of various compounds in the reclaimed water;

[0059] Calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutants in the sample to be tested, and correcting the initial retention time of each type of compound stored in the base database;

[0060] The distribution characteristics of various pollutants in urban recycled water are obtained based on the water distribution coefficient.

[0061] As a preferred embodiment of the present application, the base database adopts the Compound Composer database, and the categories of pollutant compounds in the base database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds; further, CH-composition compounds include fatty compounds, benzene compounds, polycyclic compounds, polychlorinated biphenyl compounds, etc.; CHO-composition compounds include ether compounds, ketone compounds, phenol compounds, phthalate compounds, and fatty acid compounds; nitrogen-containing compounds include aromatic amine compounds, quinoline compounds, nitro compounds, and nitrosamine compounds; pesticide compounds include insecticides, fungicides, herbicides, and other types of compounds.

[0062] As a preferred embodiment of the present application, the process of obtaining a reclaimed water sample to be tested in the area to be tested and testing the sample to be tested includes:

[0063] After sampling the reclaimed water in the area to be tested, a solid phase extraction column is used to pre-treat the collected water sample to obtain the sample to be tested;

[0064] The sample to be tested is tested with a mass spectrometer to obtain mass spectrum data of the sample to be tested, the mass spectrum data is input into the base database, and the compound category and the corresponding water distribution coefficient in the sample to be tested are obtained based on the mass spectrum lines of various compounds stored in the base database.

[0065] As a preferred embodiment of the present application, in the process of pre-testing the collected water samples using a solid phase extraction column, the absorption efficiency of different types of fillers in the solid phase extraction column for various pollutants is obtained, and an absorption efficiency threshold is set. The filler types whose absorption efficiency exceeds the absorption efficiency threshold are combined to obtain a solid phase extraction column with a combined filler, and the collected water samples are pre-treated based on the solid phase extraction column with the combined filler.

[0066] As a preferred embodiment of the present application, the process of calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutant in the sample to be tested includes:

[0067] Obtaining the initial retention time of the normal alkanes before and after the compounds corresponding to each type of pollutants in the sample to be tested in the base database, and the current retention time of the compounds corresponding to each type of pollutants;

[0068] Calculate based on the initial retention time and the current retention time to obtain the predicted retention time;

[0069] As a preferred implementation of the present application, a specific method for calculating based on the initial retention time limit and the current retention time limit is as follows:

[0070] HT T' =(HT T -HT Cn )*(HT C'n+1 -HT C'n ) / (HT Cn+1 -HT Cn )

[0071] Among them, HT T' is the predicted retention time of a compound in the sample to be tested, HT T is the retention time of the compound in the database, HT Cn and HT Cn+1 is the retention time of the n-alkanes before and after the compound in the database, HT C'n and HT C'n+1 are the current retention times of the compounds respectively.

[0072] As a preferred embodiment of the present application, the process of obtaining the distribution characteristics of various pollutants in urban recycled water based on the water distribution coefficient includes:

[0073] Based on the water distribution coefficient, the concentration ratio of the compounds corresponding to each type of pollutant in the sample to be tested is obtained, and the sampling source of the recycled water in the sample to be tested is counted;

[0074] Generate pollutant distribution charts for different urban areas based on the sampling sources and the concentration ratios;

[0075] The distribution characteristics of various pollutants in urban recycled water are obtained based on the pollutant distribution chart.

[0076] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. As for the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0077] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A reclaimed water pollutant detection system, characterized in that: It includes a pollutant database, a pollutant detection subsystem, and a feature generation subsystem which are connected in sequence; The pollutant database is used to store the compound categories corresponding to various pollutants in the reclaimed water; The pollutant detection subsystem is used to obtain a sample of reclaimed water to be tested in the area to be tested and to test the sample to be tested, so as to obtain the water distribution coefficient corresponding to various compounds in the reclaimed water; The feature generation subsystem is used to obtain the distribution characteristics of pollutants in the reclaimed water of the area to be detected according to the water distribution coefficients corresponding to various compounds; The pollutant database includes a base database and a detection calculation module. The base database adopts a Compound Composer database. The compound categories in the Compound Composer database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds; the pollutant database also includes the initial retention time and mass spectrum marking of each category of compounds; The detection calculation module calculates the actual retention time of normal alkanes before and after each category of compounds, and obtains the current retention time of normal alkanes before and after the compounds corresponding to the pollutants in the water sample to be tested, and then corrects the initial retention time of each category of compounds stored in the base database; The pollutant detection module includes a sampling module, a sample processing module, and a mass spectrometry detection module. The sampling module is used to sample the regenerated water in the detection area to obtain the regenerated water sample. The sample processing module uses a solid phase extraction column to pre-treat the regenerated water sample to obtain the sample to be tested. The mass spectrometry detection module includes a plurality of mass spectrometers. The mass spectrometers are used to scan the sample to be tested to obtain mass spectrometry data of various compounds, and the mass spectrometry data is input into the pollutant database. The qualitative and quantitative detection results of various compounds in the sample to be tested are obtained through the mass spectrometry markings and the mass spectrometry data; the qualitative and quantitative detection results include the water distribution coefficient of various compounds.

2. The reclaimed water pollutant detection system according to claim 1, characterized in that: The feature generation subsystem obtains the sampling sources and water distribution coefficients of different samples to be tested in the pollutant detection subsystem, and obtains the concentration ratios of the compounds corresponding to each type of pollutant in the samples to be tested based on the water distribution coefficients, and generates pollutant distribution charts for different urban areas based on the sampling sources and the concentration ratios, thereby obtaining the distribution characteristics of various pollutants in urban recycled water.

3. A method for detecting pollutants in recycled water, characterized in that: The following steps are involved: Construct a base database to store the types of pollutant compounds, initial retention time and mass spectrum lines in recycled water; Obtain a sample of reclaimed water to be tested in the area to be tested and test the sample to be tested to obtain the water distribution coefficient of various compounds in the reclaimed water; Calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutants in the sample to be tested, and correcting the initial retention time of each type of compound stored in the base database; Obtaining distribution characteristics of various pollutants in urban recycled water based on the water distribution coefficient; The process of obtaining a sample of recycled water to be tested in the area to be tested and testing the sample to be tested includes: After sampling the reclaimed water in the area to be tested, a solid phase extraction column is used to pre-treat the collected water sample to obtain the sample to be tested; Using a mass spectrometer to detect the sample to be tested, obtaining mass spectrum data of the sample to be tested, inputting the mass spectrum data into the base database, and obtaining the compound category and the corresponding water distribution coefficient in the sample to be tested based on the mass spectrum lines of various compounds stored in the base database; The process of calculating the predicted retention time of normal alkanes in the compounds corresponding to each type of pollutant in the sample to be tested includes: Obtaining the initial retention time of the normal alkanes before and after the compounds corresponding to each type of pollutants in the sample to be tested in the base database, and the current retention time of the compounds corresponding to each type of pollutants; Calculate based on the initial retention time and the current retention time to obtain the predicted retention time; The process of obtaining the distribution characteristics of various pollutants in urban recycled water based on the water distribution coefficient includes: Based on the water distribution coefficient, the concentration ratio of the compounds corresponding to each type of pollutant in the sample to be tested is obtained, and the sampling source of the recycled water in the sample to be tested is counted; Generate pollutant distribution charts for different urban areas based on the sampling sources and the concentration ratios; The distribution characteristics of various pollutants in urban recycled water are obtained based on the pollutant distribution chart.

4. The method for detecting pollutants in recycled water according to claim 3, characterized in that: The base database adopts the Compound Composer database, and the categories of pollutant compounds in the base database include CH-composition compounds, CHO-composition compounds, nitrogen-containing compounds, sulfur-containing compounds, phosphorus-containing compounds, pharmaceutical care product compounds, and pesticide compounds.

5. The method for detecting pollutants in recycled water according to claim 3, characterized in that: In the process of using a solid phase extraction column to perform pre-detection treatment on the collected water samples, the absorption efficiency of different types of fillers in the solid phase extraction column for various pollutants is obtained, and an absorption efficiency threshold is set. The filler types whose absorption efficiency exceeds the absorption efficiency threshold are combined to obtain a solid phase extraction column with a combined filler, and the collected water samples are pre-treated based on the solid phase extraction column with the combined filler.

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