A method for identifying the degree of groundwater intrusion into a sewer network based on radon

Abstract

The application discloses a kind of sewage pipe network groundwater invasion degree identification methods based on radon, it is related to sewage pipe network maintenance technical field.The method comprises: obtaining the water source sampling point of target area, water source sampling point includes: source sewage sampling point, groundwater sampling point and sewage pipeline node;Radon activity value of source sewage at source sewage sampling point is obtained;Radon activity value of groundwater at groundwater sampling point is obtained;Radon activity value of pipeline sewage at the sewage pipeline node is obtained in set time period;According to the radon activity value of source sewage, radon activity value of groundwater and radon activity value of pipeline sewage, determine the proportion of source sewage in pipeline sewage in set time period and the proportion of groundwater in pipeline sewage in set time period in the sewage pipeline node;According to the proportion of source sewage in pipeline sewage in the sewage pipeline node and the proportion of groundwater in pipeline sewage in the sewage pipeline node, determine the invasion degree of groundwater in sewage pipe network.

Description

Technical Field

[0001] This invention relates to the field of sewage pipe network maintenance technology, specifically to a radon-based method for identifying the degree of groundwater intrusion into sewage pipe networks. Background Technology

[0002] Traditional sewage pipe network damage detection technologies, such as closed-circuit television inspection, rapid pipeline visualization inspection, and sonar inspection, require inspection of the entire pipe network. These technologies suffer from slow inspection speed, low efficiency, and high cost, making them unsuitable for the maintenance, repair, and daily inspection of large-scale sewage pipe networks.

[0003] The technology for identifying external water intrusion in sewage pipe networks based on water quality characteristic factors can not only identify the source of sewage in different sections of the sewage pipe network, but also quantitatively analyze the amount of external water intrusion, narrowing the scope of fine screening for pipe network damage, and further shortening the maintenance time and reducing maintenance costs of sewage pipes. For example, Chinese patent application publication number CN113704932A discloses a quantitative assessment method for external water mixing in urban sewage pipe networks based on stable isotopes, and Chinese patent application publication number CN108871463A discloses a method for analyzing groundwater infiltration in sewage pipe networks based on stable metal ions. However, this technology still has problems such as poor stability of characteristic indicators, complicated implementation and analysis processes, and environmental limitations. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a radon-based method for identifying the degree of groundwater intrusion in sewage pipe networks, which can quickly and accurately identify the degree of groundwater intrusion in sewage pipe networks.

[0005] According to the first aspect, one embodiment provides a method for identifying the degree of groundwater intrusion in a sewage pipe network based on radon, including:

[0006] Obtain water source sampling points in the target area, including: source sewage sampling points, groundwater sampling points, and sewage pipeline nodes;

[0007] Obtain the radon activity value of the source sewage at the aforementioned source sewage sampling point;

[0008] Obtain the radon activity value of the groundwater at the groundwater sampling point;

[0009] Obtain the radon activity value of the sewage at the sewage pipe node within a set time period;

[0010] The proportion of source sewage to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node are determined based on the radon activity values ​​of the source sewage, groundwater, and pipeline sewage during a set time period.

[0011] The degree of groundwater intrusion in the sewage network is determined based on the proportion of source sewage to the sewage pipeline node and the proportion of groundwater to the sewage pipeline node.

[0012] In one embodiment, the radon activity value includes the radon-222 activity value.

[0013] In one embodiment, determining the proportion of source wastewater to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node within a set time period, based on the radon activity values ​​of the source wastewater, the groundwater, and the pipeline wastewater, includes:

[0014] The following formulas are used to determine the proportion of source wastewater in the wastewater pipeline node and the proportion of groundwater in the wastewater pipeline node during a given time period:

[0015] F1*R G +F2*R S =R N

[0016] F1 + F2 = 1

[0017] Among them, R S R is the radon-222 activity value of the source wastewater, F2 is the proportion of the source wastewater to the total wastewater in the wastewater pipeline node, and R is the radon-222 activity value of the source wastewater. G R represents the radon-222 activity value of the groundwater, F1 represents the proportion of groundwater to sewage in the sewage pipe node, and R represents the total radon activity value of the groundwater. N The value is the radon-222 activity value of the sewage in the pipeline.

[0018] In one embodiment, the method is applied to a radon detector to obtain the radon-222 activity values ​​of the source wastewater, the groundwater, and the pipeline wastewater.

[0019] In one embodiment, obtaining the radon-222 activity value of the sewage from the pipeline using the radon detector includes:

[0020] The radon detector is used to obtain the initial radon-222 activity value and the corresponding temperature value of the sewage in the pipeline within a set time period; the radon detector is then used to correct the initial radon-222 activity value of the sewage in the pipeline based on the temperature value, so as to determine the radon-222 activity value of the sewage in the pipeline.

[0021] In one embodiment, the set time period is selected from a set monitoring cycle, which includes:

[0022] Within the target area, the set monitoring period is defined as the time from when the wastewater discharge exceeds a first set discharge amount to when the wastewater discharge falls below a second set discharge amount; wherein, the first set discharge amount is greater than the second set discharge amount.

[0023] In one embodiment, the set monitoring period includes 8 to 48 hours.

[0024] In one embodiment, the acquisition of water source sampling points in the target area includes: source sewage sampling points, groundwater sampling points, and sewage pipeline nodes, comprising:

[0025] Collect data on the distribution of pipe networks and sources of sewage in the target area;

[0026] Based on the pipeline network distribution, different nodes of the pipeline are determined, and based on the sewage source data, the direction of water flow, the distribution of sewage, and the distribution of groundwater are determined.

[0027] Based on the different nodes of the pipeline, the sewage pipeline nodes are selected in the target area; based on the water flow direction, the distribution of sewage and the distribution of groundwater, the source sewage sampling point and the groundwater sampling point are selected in the target area.

[0028] In one embodiment, determining the proportion of source wastewater to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node within a set time period, based on the radon activity values ​​of the source wastewater, the groundwater, and the pipeline wastewater, includes:

[0029] When obtaining the radon activity values ​​of the source wastewater, groundwater, and pipeline wastewater, the auxiliary water quality standard values ​​of the source wastewater, groundwater, and pipeline wastewater are also obtained accordingly.

[0030] The degree of groundwater intrusion in the sewage network can be determined by using the auxiliary water quality standard values ​​of the source sewage, the auxiliary water quality standard values ​​of groundwater, and the auxiliary water quality standard values ​​of pipeline sewage.

[0031] In one embodiment, the auxiliary water quality standard values ​​include at least one of TDS, EC, pH, and ammonia nitrogen.

[0032] According to the above embodiment, a radon-based method for identifying the degree of groundwater intrusion in a sewage pipe network involves obtaining the radon activity value of the source sewage at the source sewage sampling point, obtaining the radon activity value of the groundwater at the groundwater sampling point, and obtaining the radon activity value of the pipe sewage at the sewage pipe node. Based on the radon activity values ​​of the sewage, groundwater, and pipe sewage, the proportion of source sewage occupying the pipe sewage in the sewage pipe node and the proportion of groundwater occupying the pipe sewage in the sewage pipe node are determined. Based on the proportion of source sewage occupying the pipe sewage in the sewage pipe node and the proportion of groundwater occupying the pipe sewage in the sewage pipe node, the degree of groundwater intrusion in the sewage pipe network is determined. This application determines the extent of external water intrusion in the entire pipe network by using the relative proportion of groundwater and source sewage, reducing workload and intrusion costs. It also narrows the scope of groundwater intrusion screening for large-scale urban sewage pipe networks, accurately identifying areas in the sewage pipe network with high levels of groundwater intrusion. This avoids the time-consuming and laborious pipe-by-pipe analysis required by traditional methods such as closed-circuit television detection and rapid pipe view detection, thereby reducing the maintenance costs of urban sewage pipe networks. Attached Figure Description

[0033] Figure 1 A flowchart illustrating a radon-based groundwater intrusion identification method for sewage pipe networks, according to one embodiment.

[0034] Figure 2 This is a flowchart illustrating the acquisition of water source sampling points in a target area within a method for identifying the degree of groundwater intrusion into a sewage pipe network, according to one embodiment.

[0035] Figure 3 This is a schematic diagram showing the distribution of the sewage pipe network and sewage source data in the target area in a specific embodiment. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0037] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0038] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0039] This application addresses the shortcomings of existing technologies by providing a radon-based groundwater intrusion identification technology for sewage pipe networks that is fast, low-cost, and easy to operate. This technology enables rapid assessment of groundwater intrusion in sewage pipe networks, thereby providing a theoretical basis for the maintenance of sewage pipe networks.

[0040] Please refer to Figure 1 This application provides a method for identifying the degree of groundwater intrusion in sewage pipe networks based on radon, which will be elaborated below.

[0041] Step S100: Obtain water source sampling points in the target area.

[0042] In some embodiments, water source sampling points include source sewage sampling points, groundwater sampling points, and sewage pipeline nodes. Obtaining water source sampling points in the target area during step S100 includes the following steps:

[0043] Step S110: Collect data on the distribution of pipe networks and sources of sewage in the target area.

[0044] Step S120: Determine the different nodes of the pipeline based on the pipeline network distribution, and determine the water flow direction, sewage distribution and groundwater distribution based on sewage source data.

[0045] Step S130: Select and arrange sewage pipe nodes in the target area according to different nodes of the pipeline, and select and arrange source sewage sampling points and groundwater sampling points in the target area according to the water flow direction, sewage distribution and groundwater distribution.

[0046] Step S200: Obtain the radon activity values ​​of the source wastewater, the groundwater, and the pipeline wastewater.

[0047] When it is necessary to detect the degree of groundwater intrusion into the sewage pipe network of a target area, the radon activity value of the source sewage at the location of the source sewage sampling point should be obtained on the day of detection or a few days before detection. Simultaneously, the radon activity value of the groundwater at the location of the groundwater sampling point should also be obtained on the day of detection or a few days before detection. In addition, the radon activity value of the sewage at the location of the sewage pipe node should be continuously obtained within a set time period.

[0048] Step S300: Determine the proportion of source sewage to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node within a set time period based on the radon activity values ​​of the source sewage, groundwater, and pipeline sewage.

[0049] Step S400: Determine the degree of groundwater intrusion in the sewage network based on the proportion of source sewage occupying the sewage pipe nodes and the proportion of groundwater occupying the sewage pipe nodes within a set time period.

[0050] In some embodiments, when the proportion of source sewage in a sewage pipeline node is less than a first predetermined proportion, and the proportion of groundwater in a sewage pipeline node is greater than a second predetermined proportion, it indicates that the sewage pipeline node in the sewage network is severely affected by groundwater intrusion. The larger the second predetermined proportion of groundwater, the smaller the first predetermined proportion of source sewage; the two are inversely related. Furthermore, the first and second predetermined proportions need to be determined based on the actual conditions of the target area. Analyzing the proportions of source sewage and groundwater in each sewage pipeline node helps determine the degree of groundwater intrusion in the entire pipeline network, identify periods and sections with severe groundwater intrusion, and provide suggestions and convenience for pipeline network maintenance.

[0051] In some embodiments, when only the radon activity values ​​of the source wastewater and groundwater are obtained, it means that the entire pipe network contains only source wastewater and groundwater. Therefore, determining the proportion of source wastewater to the total volume of wastewater in a given pipe node and the proportion of groundwater to the total volume of wastewater in a given pipe node are equivalent to determining the proportion of source wastewater to the total volume of wastewater in that pipe node and the proportion of groundwater to the total volume of wastewater in that pipe node. If there is other external water in the entire pipe network, it is also necessary to obtain the radon activity values ​​of the other external water to calculate the corresponding proportion of the other external water to the total volume of wastewater in the pipe node.

[0052] Since radon is a radioactive inert gas Rn, its radioactive isotopes include... 200 Rn~ 226There are 27 types of radon (Rn). Among them, radon-222 is widely distributed in nature and is commonly used as a tracer. Its radioactivity in groundwater is often 2-3 orders of magnitude higher than that of other types of water (such as surface water and sewage). Therefore, when groundwater intrudes into sewage pipe networks, it will cause abnormal radon-222 radioactivity in the sewage. This application utilizes radon-222 to identify the degree of groundwater intrusion into sewage pipe networks.

[0053] In this application, when using radon-222 to identify the degree of groundwater intrusion into sewage pipe networks, the method provided in this application will be applied to a radon meter to measure the radon-222 activity value. Specifically, within a set time period, the radon-222 activity values ​​of the source sewage at the source pollution point, the groundwater at the groundwater sampling point, and the sewage in the pipe at the sewage pipe node will be obtained respectively.

[0054] In some embodiments, the set time period is selected from a set monitoring cycle. The set monitoring cycle begins when the amount of domestic sewage discharged from the target area in the morning begins to be large and exceeds a first set discharge amount, and ends when the amount of domestic sewage discharged at night significantly decreases until it falls below a second set discharge amount. In some embodiments, there are situations where the amount of domestic sewage discharged during the day is relatively small and the amount discharged at night is relatively large. Therefore, the set monitoring cycle can also begin when the amount of domestic sewage discharged from the target area begins to be large and exceeds the first set discharge amount, and ends when the amount of domestic sewage discharged at night or the next day significantly decreases until it falls below the second set discharge amount. The first and second set discharge amounts can be determined according to the actual situation of the target area. The specific set monitoring cycle can also be determined based on factors such as the source and concentrated discharge time of the sewage in the target area, and the availability of groundwater. In some embodiments, the set monitoring cycle varies from 8 to 48 hours, and the set time period is one hour.

[0055] Because temperature affects the partition coefficient of radon-222 in air and water, thus affecting the accuracy of radon-222 measurements, the data processing software accompanying the radon meter needs to correct the radon-222 activity values ​​over time based on the measured temperature. In other words, temperature correction is only necessary when continuously measuring radon-222 activity values ​​over a period of time. Specifically, the radon meter acquires the initial radon-222 activity value and corresponding temperature value of the piped wastewater within a set time period, and then uses the accompanying data processing software to correct the initial radon-222 activity value of the piped wastewater based on the temperature value to obtain the final radon-222 activity value of the piped wastewater. In some embodiments, the radon meter uses the RAD AQUA mode for continuous measurement when measuring the radon-222 activity value of piped wastewater. When measuring the radon-222 activity values ​​of source wastewater and groundwater, the radon meter uses the RAD H2O mode and directly samples the radon into the meter's container for determination.

[0056] Therefore, in step S200, the radon-222 activity values ​​of the source wastewater, groundwater, and pipeline wastewater are obtained. After obtaining these values, the proportions of source wastewater and groundwater in the pipeline wastewater are determined using the following formulas for a given time period:

[0057] F1*R G +F2*R S =R N

[0058] F1 + F2 = 1

[0059] Among them, R S R represents the radon-222 activity value of the source wastewater, F2 represents the proportion of source wastewater to the total wastewater in the wastewater pipeline node, and R represents the total radon-222 activity value of the source wastewater. G R represents the radon-222 activity value of groundwater, F1 represents the proportion of groundwater to sewage in the sewage pipe node, and R represents the radon-222 activity value of groundwater. N This represents the radon-222 activity value of the sewage in the pipeline. F1+F2=1 indicates that during this set time period, the entire pipeline network contains only two water sources: groundwater and source sewage.

[0060] In some embodiments, when monitoring the radon activity values ​​of source wastewater, groundwater, and pipeline wastewater, auxiliary water quality standard values ​​for source wastewater, groundwater, and pipeline wastewater can also be monitored simultaneously. In some embodiments, the auxiliary water quality standard values ​​include at least one of TDS, EC, pH, and ammonia nitrogen. TDS refers to total dissolved solids, indicating the presence of impurities in the water source; the more impurities in the water, the higher the TDS value. EC is electrical conductivity, representing the ability of a solution to conduct electric current. Pure water has very low conductivity, but conductivity increases when water contains inorganic acids, alkalis, salts, or charged organic colloids. pH refers to the acidity or alkalinity of the solution. Ammonia nitrogen refers to the ammonia nitrogen content in the water. Excessive ammonia nitrogen in water will cause low dissolved oxygen levels, consuming large amounts of oxygen in the water, resulting in blackening and foul odors, and a decline in water quality.

[0061] When using the radon-based groundwater intrusion identification method for sewage pipe networks provided in this application, if there are no groundwater collection conditions in the target area, the sewage in the pipes between 1:00 AM and 4:00 AM can be considered as groundwater intruding into the sewage pipes, based on the principle of the minimum flow rate at night. During this period, the sewage in the pipes is considered to be sewage without human discharge, and therefore the radon-222 activity value of the sewage during this period can be considered as the radon-222 activity value of the groundwater. If there are other external water sources in the sewage pipe network of the target area besides groundwater, it is also necessary to monitor the characteristic factors of these other water sources simultaneously. When constructing the calculation model, the proportion of other external water sources needs to be considered.

[0062] Compared to traditional water quality and quantity methods, this application eliminates the need for flow monitoring. It only requires assessing the relative proportion of groundwater to determine the extent of external water intrusion into the pipe network, reducing workload and detection costs. Furthermore, the proportion of groundwater in wastewater can be calculated on-site, resulting in a shorter analysis cycle. The radon-222 selected in this application enables rapid on-site detection, shortening detection time, reducing costs, and improving data accuracy. Simultaneously, radon-222 activity in groundwater is 2-3 orders of magnitude higher than in surface water and wastewater, exhibiting greater stability, sensitivity, and specificity compared to traditional water quality factors (such as ammonia nitrogen and chemical oxygen demand). This application also helps to narrow the scope of groundwater intrusion screening for large-scale urban wastewater pipe networks, accurately identifying areas with high levels of groundwater intrusion within the network. It avoids the time-consuming and labor-intensive segment-by-segment analysis required by traditional methods such as closed-circuit television monitoring and rapid pipe-viewing, thereby reducing the maintenance costs of urban wastewater pipe networks.

[0063] The following describes the process of identifying the degree of groundwater intrusion in a target area using the radon-based groundwater intrusion identification method for sewage pipe networks provided in this application.

[0064] Please refer to Figure 3It is the data of the sewage pipe network distribution and sewage sources in the target area. The main sewage source in the target area is domestic water, and the centralized discharge time is from 10:00 am to 19:30 pm. Since the target area is adjacent to the sea, considering the possibility of seawater intrusion into the sewage pipes, seawater is regarded as one of the external waters invading the sewage pipes. Therefore, EC is used as the auxiliary water quality standard value for seawater.

[0065] According to Figure 3 the sewage pipe network distribution and sewage source data in the target area, the source sewage sampling point S, groundwater sampling point G, seawater sampling point SW, sewage pipe node N1, sewage pipe node N2, sewage pipe node N3 and sewage pipe node N4 are determined.

[0066] At the source sewage sampling point S, the source sewage at this point is obtained. At the groundwater sampling point G, the groundwater at this point is obtained. At the seawater sampling point SW, the seawater at this point is obtained. In the same time period, the radon-222 activity value R S of the source sewage at the source sewage sampling point S is detected respectively using the radon in water detection configuration (RAD H2O) of the RAD7 radon detector, the radon-222 activity value R G of the groundwater at the groundwater sampling point G is detected, and the radon-222 activity value R SW of the seawater at the seawater sampling point SW is detected. The EC value E S of the source sewage at the source sewage sampling point S is detected using a portable EC detection device, the EC value E G of the groundwater at the groundwater sampling point G is detected, and the EC value E SW of the seawater at the seawater sampling point SW is detected.

[0067] In the corresponding time period, at each sewage pipe node, the radon-222 activity value R N of the sewage in the pipe at this point is detected using the radon in water detection configuration (RAD AQUA) of the RAD7 radon detector, and the EC value E N of the sewage in the pipe at this point is detected using a portable EC detection device.

[0068] The monitoring period is set to 9:00 - 20:00, and the radon-222 activity value and EC value are obtained every hour. Then, the radon-222 activity value is automatically corrected according to the measured temperature using the Capture data processing software supporting the radon detector. According to the corrected data, a calculation model for the proportion of groundwater intrusion is constructed. The proportion of groundwater in the sewage at a sewage pipe node in a certain time period can be calculated by the following formula:

[0069] F1*R G +F2*R S +F3*R SW =R N

[0070] F1*E G +F2*E S +F3*E SW =E N

[0071] F1 + F2 + F3 = 1

[0072] Among them, R S R represents the radon-222 activity value of the source wastewater. G R represents the radon-222 activity value of groundwater. SW R represents the radon-222 activity value of seawater. N The activity value of radon-222 in the sewage from the pipeline; E S E represents the EC value of the source wastewater. G E represents the EC value of groundwater. SW E represents the EC value of seawater. N F1 represents the EC value of the sewage in the pipeline; F2 represents the proportion of groundwater in the sewage pipeline node; F3 represents the proportion of source sewage in the sewage pipeline node; and F4 represents the proportion of seawater in the sewage pipeline node. F1+F2+F3=1 indicates that the pipeline network contains only three types of water sources during this period: groundwater, source sewage, and seawater.

[0073] Taking sewage pipeline node N3 as an example, the relative proportions of groundwater, sewage, and seawater in the sewage volume of sewage pipeline node N3 at different time periods are shown in the table below, obtained by the calculation model:

[0074]

[0075]

[0076] Based on the proportions of various water types at this node, it can be seen that the upstream pipeline area of ​​the entire pipeline network is more severely affected by seawater intrusion, while the degree of groundwater intrusion is weaker.

[0077] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A method for identifying the degree of groundwater intrusion in sewage pipe networks based on radon, characterized in that, include: Obtain water source sampling points in the target area, including: source sewage sampling points, groundwater sampling points, and sewage pipeline nodes; Obtain the radon activity value of the source sewage at the aforementioned source sewage sampling point; Obtain the radon activity value of the groundwater at the groundwater sampling point; Obtain the radon activity value of the sewage at the sewage pipe node within a set time period; The proportion of source sewage to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node are determined based on the radon activity values ​​of the source sewage, groundwater, and pipeline sewage during a set time period. The degree of groundwater intrusion in the sewage network is determined based on the proportion of source sewage to the sewage pipeline node and the proportion of groundwater to the sewage pipeline node. The radon activity value includes the radon-222 activity value; The following formulas are used to determine the proportion of source wastewater in the wastewater pipeline node and the proportion of groundwater in the wastewater pipeline node during a given time period: F1*R G +F2*R S =R N F1 + F2 = 1 Among them, R S R is the radon-222 activity value of the source wastewater, F2 is the proportion of the source wastewater to the total wastewater in the wastewater pipeline node, and R is the radon-222 activity value of the source wastewater. G R represents the radon-222 activity value of the groundwater, F1 represents the proportion of groundwater to sewage in the sewage pipe node, and R represents the total radon activity value of the groundwater. N The value is the radon-222 activity value of the sewage in the pipeline.

2. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 1, characterized in that, The method is applied to a radon detector to obtain the radon-222 activity values ​​of the source wastewater, groundwater, and pipeline wastewater.

3. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 2, characterized in that, The process of obtaining the radon-222 activity value of the sewage in the pipeline using the radon detector includes: The radon detector is used to obtain the initial radon-222 activity value and the corresponding temperature value of the sewage in the pipeline within a set time period; the radon detector is then used to correct the initial radon-222 activity value of the sewage in the pipeline based on the temperature value, so as to determine the radon-222 activity value of the sewage in the pipeline.

4. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 3, characterized in that, The set time period is selected from the set monitoring period, which includes: Within the target area, the set monitoring period is defined as the time from when the wastewater discharge exceeds a first set discharge amount to when the wastewater discharge falls below a second set discharge amount; wherein, the first set discharge amount is greater than the second set discharge amount.

5. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 4, characterized in that, The set monitoring period includes 8 to 48 hours.

6. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 1, characterized in that, The acquisition of water source sampling points in the target area includes: source sewage sampling points, groundwater sampling points, and sewage pipeline nodes, including: Collect data on the distribution of pipe networks and sources of sewage in the target area; Based on the pipeline network distribution, different nodes of the pipeline are determined, and based on the sewage source data, the direction of water flow, the distribution of sewage, and the distribution of groundwater are determined. Based on the different nodes of the pipeline, the sewage pipeline nodes are selected in the target area; based on the water flow direction, the distribution of sewage and the distribution of groundwater, the source sewage sampling point and the groundwater sampling point are selected in the target area.

7. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 1, characterized in that, The step of determining the proportion of source wastewater to the total sewage in the sewage pipeline node and the proportion of groundwater to the total sewage in the sewage pipeline node within a set time period, based on the radon activity values ​​of the source wastewater, groundwater, and pipeline wastewater, includes: When obtaining the radon activity values ​​of the source wastewater, groundwater, and pipeline wastewater, the auxiliary water quality standard values ​​of the source wastewater, groundwater, and pipeline wastewater are also obtained accordingly. The degree of groundwater intrusion in the sewage network can be determined by using the auxiliary water quality standard values ​​of the source sewage, the auxiliary water quality standard values ​​of groundwater, and the auxiliary water quality standard values ​​of pipeline sewage.

8. The radon-based groundwater intrusion identification method for sewage pipe networks as described in claim 7, characterized in that, The auxiliary water quality standard values ​​include at least one of TDS, EC, pH and ammonia nitrogen.

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