Method and system for predicting service life of plastic water supply pipeline and comprehensively evaluating safety of drinking water

Abstract

The embodiment of the invention relates to the technical field of pipeline evaluation, and discloses a plastic water supply pipeline life prediction and drinking water safety comprehensive evaluation method, which comprises the following steps: at a set aging time node, collecting a water sample in a pipe from a water outlet end of a sample pipe exposure unit, and collecting a pipe sample at a corresponding aging time point; analyzing the organic matters aged and separated out from the water supply pipeline by adopting a gas chromatography-mass spectrometry method to determine the types and corresponding concentrations of the organic matters separated out at corresponding aging time points; determining a corresponding comprehensive hazard index; and comparing the comprehensive hazard index with a set condition to determine whether the water supply pipeline is harmful to the drinking water in the aging process. According to the method provided by the embodiment of the invention, the comprehensive hazard index is introduced, and the types and concentrations of the complex organic matters are combined with the drinking water health standard, so that the quantitative evaluation of the health risk of the pipe aging precipitate is realized. The method is more comprehensive than simply seeing whether the concentration exceeds the standard or not.

Description

Technical Field

[0001] This invention relates to the field of pipeline assessment technology, specifically to a method and system for predicting the lifespan of plastic water supply pipelines and comprehensively assessing drinking water safety. Background Technology

[0002] Currently, high-density polyethylene (HDPE) pipes are widely used in urban water supply systems due to their advantages such as good corrosion resistance, convenient construction, and long service life. In actual operation, HDPE water supply pipes are in direct contact with tap water for extended periods. To ensure the microbial safety of drinking water, tap water typically maintains a certain concentration of residual chlorine or other chlorine-based disinfectants. These disinfectants and their derived active chlorine-containing substances have continuous oxidizing properties, placing HDPE water supply pipes in a low-concentration, long-term chlorinated chemical environment during service.

[0003] In the aforementioned chlorine-containing environment, HDPE water supply pipes are prone to material aging under the combined influence of physical factors such as water temperature, internal pressure, and flow rate, as well as the oxidizing effect of residual chlorine. Existing research and engineering practice show that functional additives such as antioxidants and stabilizers added during the manufacturing process of HDPE pipes preferentially participate in the oxidation reaction and are gradually consumed, leading to polymer molecular chain oxidation, microstructure damage, and material performance deterioration. As antioxidants are depleted, on the one hand, the aging resistance of the pipes decreases significantly, shortening their actual service life; on the other hand, some antioxidants and their oxidation products may precipitate into the piped tap water through migration, diffusion, or dissolution, potentially impacting drinking water quality.

[0004] Currently, engineering evaluation and life prediction methods for plastic water supply pipes mainly focus on the pipe's mechanical properties and structural safety, such as pressure resistance, tensile strength, and failure time. These methods struggle to reflect the early aging process caused by chemical oxidation in chlorine-containing environments. Furthermore, existing accelerated aging tests primarily focus on thermal aging, UV aging, or single hydrostatic pressure conditions, failing to adequately simulate material aging and additive consumption and precipitation behavior under long-term exposure to low concentrations of residual chlorine. In addition, existing water quality safety monitoring and evaluation systems mainly focus on source water quality and treatment processes, paying insufficient attention to the organic matter precipitation caused by pipe aging during distribution, and lacking systematic assessment methods for the pipe's service life. Therefore, designing a scheme capable of accurately assessing pipe life has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention discloses a method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, which enables more accurate measurement of the effective lifespan of pipe materials.

[0006] The first aspect of this invention discloses a method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, including: The test parameters of polyolefin pipes are obtained during the testing and evaluation process, and the operating parameters are dynamically adjusted according to the test parameters to simulate the actual operating conditions of the water supply network. At the set aging time points, water samples were collected from the water outlet of the sample tube exposure unit, as well as pipe samples at the corresponding aging time points. Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types and corresponding concentrations of organic matter precipitated at the corresponding aging time points. The comprehensive hazard index is determined based on the types and concentrations of organic matter precipitated at corresponding aging time points and the corresponding health reference concentrations; the comprehensive hazard index is then compared with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

[0007] As an optional implementation, in the first aspect of the present invention, the test evaluation process includes: starting the chlorine-containing water supply system, so that the chlorine-containing water continuously flows through the sample tube exposure unit under a set flow state, and contacts the inner wall of the pipe sample under set temperature, pressure and flow rate conditions, so that the polyolefin pipe is continuously exposed and accelerated to age in a residual chlorine environment. The method of analyzing organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry (GC-MS) to determine the types and corresponding concentrations of organic matter precipitated at specific aging time points includes: Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types of organic matter precipitated at the corresponding aging time points; The concentration of each organic compound at the corresponding aging time point is determined based on the type of organic compound, the aging time point, and a pre-established functional relationship between precipitation behavior and aging time; wherein, the functional relationship between precipitation behavior and aging time is:

[0008] Where t1 and t2 represent the critical time points of adjacent aging stages, and The evolution coefficient associated with the i-th precipitated organic compound. This represents the maximum level of organic matter that can be released during the aging process. This represents the precipitation concentration during the later, stable phase.

[0009] As an optional implementation, in the first aspect of the present invention, the formula for calculating the comprehensive hazard index is: ;in, Let i be the health reference concentration for the i-th substance. denoted as , where n is the concentration of organic matter and n is the number of different types of organic matter. When the comprehensive hazard index HI(t) exceeds the set threshold, the water supply pipe at the aging time point is determined to pose a potential health hazard to drinking water.

[0010] As an optional implementation, in the first aspect of the present invention, the test evaluation method further includes: By synergistically analyzing the decay characteristics of oxidation-induced time, carbonyl exponential growth characteristics, crack density and crack size evolution characteristics, and macroscopic mechanical property decay characteristics, a comprehensive aging damage function is constructed. The comprehensive aging damage function is as follows: ,in These are weighting coefficients that sum to 1. The weights are determined based on experimental fitting or engineering experience. Antioxidant depletion factor; It is a chemical oxidizing factor. It is a surface polarity degradation factor. As a microstructural damage factor, ) is the mechanical parameter attenuation factor.

[0011] As an optional implementation, in the first aspect of the present invention, the aging damage function and time satisfy a kinetic relationship: Where k is the environmentally relevant aging rate coefficient and n is the aging index; when the overall damage reaches the preset failure threshold D crit If the pipeline reaches the end of its lifespan or enters a high-risk failure state, it is determined that the pipeline has reached the end of its lifespan.

[0012] As an optional implementation, in the first aspect of the present invention, the failure threshold is... =1, and ,in, =0.1~0.2; when When the value is 1.0, the pipeline is considered to have reached the end of its design life.

[0013] As an optional implementation, in the first aspect of the present invention, the predicted service life t is determined by the comprehensive aging damage function. f It can be calculated using the following formula: ; The model extrapolates the performance degradation trend to achieve scientific prediction and health assessment of the remaining life of plastic water supply pipes in a chlorine-containing environment. The evolution rate of the comprehensive aging damage function is characterized by the environmentally related aging rate coefficient k. The aging rate coefficient is not a fixed constant, but a function parameter related to the temperature T, internal pressure P and redox potential in the service environment of the water supply pipe, which is used to reflect the difference in the cumulative rate of aging damage per unit time under different environmental conditions. The aging rate coefficient It can be determined in the following form:

[0014] in, The aging rate coefficient is the reference operating condition, which is a preset reference temperature, reference pressure and reference redox potential. , and These are the effects of temperature, pressure, and redox potential on the aging rate, respectively. Temperature effect function f T (T) shall be determined in the following manner: Among them, E a RT is the apparent activation energy for aging, and RT is the gas constant.

[0015] A second aspect of this invention discloses a system for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, comprising: Acquisition module: used to acquire the detection parameters of polyolefin pipes during the testing and evaluation process, and to dynamically adjust the operating parameters based on the detection parameters to simulate the actual operating conditions of the water supply network; Acquisition module: Used to collect water samples from the outlet of the sample tube exposure unit and pipe samples at the corresponding aging time points at the set aging time points. Analysis module: Used to analyze organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry to determine the types and concentrations of organic matter precipitated at the corresponding aging time points; Assessment module: used to determine the corresponding comprehensive hazard index based on the types and concentrations of organic matter precipitated at the corresponding aging time points and the corresponding health reference concentrations; and to compare the comprehensive hazard index with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

[0016] A third aspect of the present invention discloses an electronic device, comprising: a memory storing executable program code; a processor coupled to the memory; the processor calling the executable program code stored in the memory to execute the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety disclosed in the first aspect of the present invention.

[0017] A fourth aspect of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety disclosed in the first aspect of the present invention.

[0018] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: The method in this invention introduces a comprehensive hazard index, combining the complex types and concentrations of organic matter with drinking water health standards to achieve a quantitative assessment of the health risks of leaching from aging pipe materials. This is more comprehensive than simply looking at whether the concentration exceeds the standard, and can comprehensively reflect the potential risks when multiple harmful substances coexist. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety disclosed in this embodiment of the invention. Figure 2 This is a schematic diagram of the structure of a plastic water supply pipe life prediction and drinking water safety comprehensive assessment system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terms first, second, third, fourth, etc., in the specification and claims of this invention are used to distinguish different objects, not to describe a specific order. The terms used in the embodiments of this invention include and have, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0023] Example 1 Please see Figure 1 , Figure 1 This is a flowchart illustrating the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, as disclosed in this embodiment of the invention. The execution entity of the method described in this embodiment is an execution entity composed of software and / or hardware. This execution entity can receive relevant information via wired or / or wireless means and can send certain instructions. It may also have certain processing and storage functions. This execution entity can control multiple devices, such as remote physical servers or cloud servers and related software, or local hosts or servers and related software that perform related operations on devices located in a certain location. In some scenarios, it can also control multiple storage devices, which may be placed in the same location as the devices or in different locations. Figure 1 As shown, the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety includes the following steps: S101: Obtain the detection parameters of polyolefin pipes during the testing and evaluation process, and dynamically adjust the operating parameters according to the detection parameters to simulate the actual operating conditions of the water supply network. S102: At the set aging time points, collect water samples from the outlet of the sample tube exposure unit and collect pipe samples at the corresponding aging time points. S103: Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types and corresponding concentrations of organic matter precipitated at the corresponding aging time points; S104: Determine the corresponding comprehensive hazard index based on the types and concentrations of organic matter precipitated at the corresponding aging time points and the corresponding health reference concentrations; and compare the comprehensive hazard index with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

[0024] In this embodiment of the invention, by dynamically adjusting the operating parameters according to the detection parameters, the complex working conditions (such as pressure, flow rate, water quality fluctuations, etc.) faced by polyolefin pipes in actual water supply networks can be simulated more accurately, making the accelerated aging or testing process in the laboratory closer to reality, thereby improving the reliability of life prediction and performance evaluation.

[0025] The method of this invention simultaneously collects water samples and pipe material samples at corresponding aging time points. This enables simultaneous monitoring of the degradation of the pipe material's performance (changes in physicochemical properties) and the impact on water quality (precipitates), providing direct evidence for establishing the correlation between the degree of pipe aging and water quality deterioration.

[0026] Gas chromatography-mass spectrometry (GC-MS) was used to analyze the precipitated organic matter. GC-MS is a highly efficient technique for analyzing complex organic mixtures, possessing high separation efficiency and high sensitivity. It can accurately identify and quantify trace or micro-organic matter precipitated into the water during pipe aging, ensuring the scientific rigor of the analysis of health risk sources. Furthermore, by comparing the calculated comprehensive hazard index with set conditions (which may be safety thresholds or standard limits), a clear quantitative basis is provided for determining whether water supply pipes will pose a hazard to drinking water during aging, thereby scientifically defining the safe service life end of the pipe materials.

[0027] More preferably, the test and evaluation process includes: starting the chlorine-containing water supply system, so that the chlorine-containing water continuously flows through the sample tube exposure unit under a set flow state, and contacts the inner wall of the pipe sample under set temperature, pressure and flow rate conditions, so that the polyolefin pipe is continuously exposed to and accelerated aging in a residual chlorine environment. The method of analyzing organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry (GC-MS) to determine the types and corresponding concentrations of organic matter precipitated at specific aging time points includes: Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types of organic matter precipitated at the corresponding aging time points; The concentration of each organic compound at the corresponding aging time point is determined based on the type of organic compound, the aging time point, and a pre-established functional relationship between precipitation behavior and aging time; wherein, the functional relationship between precipitation behavior and aging time is:

[0028] Where t1 and t2 represent the critical time points of adjacent aging stages, and The evolution coefficient associated with the i-th precipitated organic compound. This represents the maximum level of organic matter that can be released during the aging process. This represents the precipitation concentration during the later, stable phase.

[0029] Specifically, in water supply environments containing residual chlorine, plastic water supply pipes will release a certain amount of organic matter into the water during long-term service or accelerated aging. Due to differences in resin matrix type, antioxidant system composition, processing aids type and addition ratio among different plastic water supply pipes, the types, composition, and evolution characteristics of the organic matter released during aging also vary significantly.

[0030] Therefore, this invention does not limit the specific chemical composition of the precipitated organic matter, but rather detects and determines the organic matter that may precipitate during the aging process based on the actual formulation characteristics of the tested pipeline. The precipitated organic matter mainly includes, but is not limited to, the following categories: 1. Antioxidants and their degradation or oxidation products, including hindered phenolic antioxidants, phosphate ester antioxidants, and small molecule organic matter formed after oxidation, hydrolysis, or structural transformation in a residual chlorine environment; 2. Migration products of processing aids or stabilizers, including low-molecular-weight components with a certain migration ability in lubricants, dispersants, nucleating agents, or other functional aids introduced during pipe processing or molding; 3. Crack products generated by the polymer matrix during oxidative aging, including low-molecular-weight organic matter generated after the polyethylene main chain undergoes oxidation or cleavage reactions, such as aldehydes, ketones, organic acids, or low-carbon chain hydrocarbon derivatives. The precipitation behavior of different types of organic matter during the aging process is closely related to their source mechanism and exhibits different time evolution characteristics as the pipeline aging stage progresses.

[0031] More preferably, the formula for calculating the comprehensive hazard index is: ;in, Let i be the health reference concentration for the i-th substance. Let represent the concentration of organic matter, and n represent the number of different types of organic matter. When the comprehensive hazard index HI(t) exceeds a set threshold, the water supply pipes at the aging point are deemed to pose a potential health hazard to drinking water. A specific comprehensive hazard index is constructed using the above method to serve as the basis for subsequent judgments regarding whether a health hazard exists.

[0032] More preferably, the test evaluation method further includes: By synergistically analyzing the decay characteristics of oxidation-induced time, carbonyl exponential growth characteristics, crack density and crack size evolution characteristics, and macroscopic mechanical property decay characteristics, a comprehensive aging damage function is constructed. The comprehensive aging damage function is as follows: ,in, These are weighting coefficients that sum to 1. The weights are determined based on experimental fitting or engineering experience. Antioxidant depletion factor; It is a chemical oxidizing factor. It is a surface polarity degradation factor. As a microstructural damage factor, ) is the mechanical parameter attenuation factor.

[0033] In practical implementation, to eliminate the influence of different physical dimensions, this invention defines a series of dimensionless aging damage factors, with the antioxidant depletion factor defined as follows: Where OIT0 is the initial oxidation induction time, and OIT(t) is the current oxidation induction time; the chemical oxidation factor is defined as... CI f This is the failure threshold; To initialize chemical oxidation parameters, The current chemical oxidation parameters are used; the surface polarity degradation factor is defined as follows: To reflect the evolution of inner wall wettability; microstructural damage factor through crack density ρ c Calculation, defined as The macroscopic mechanical parameter M, represented by tensile strength or compressive strength, is defined as... This reflects the decay of the mechanical parameter M. Through these formulas, the aging phenomena in various dimensions are uniformly transformed into a description of damage level between 0 and 1.

[0034] Based on the normalization of a single index, this invention constructs the aforementioned comprehensive aging damage function to perform specific comprehensive aging damage calculations, thereby facilitating subsequent comprehensive lifespan assessment.

[0035] Specifically, at preset aging time points, water samples are collected from the outlet of the sample tube's exposed unit, and the collected water samples are sealed, preserved, and pretreated; simultaneously, pipe samples at corresponding aging time stages are collected. Specifically, the aging time points include the initial stage, the intermediate stage, and the later stage, to reflect the material degradation and precipitation characteristics of plastic water supply pipes at different aging stages.

[0036] The steps of this embodiment of the invention include: Based on the aging mechanism of plastic water supply pipes under the combined action of chemical environment and service stress, the pipe aging process is divided into the antioxidant depletion stage, the oxidative degradation and microcrack initiation stage, and the crack propagation and brittle failure stage, namely the initial stage, the middle stage, and the late stage. Quantifiable multi-level characterization parameters are used to quantitatively describe the pipe aging behavior for the key change characteristics of each stage.

[0037] In the first stage, under the long-term action of chemical media, the antioxidant system in the plastic water supply pipe continues to migrate and be consumed, but the polymer backbone structure remains intact, and no obvious oxidative breakage reaction has occurred. During this stage, the macroscopic structure and mechanical properties of the pipe do not change significantly, but its antioxidant protection capability gradually decreases, causing the material to gradually transform from a chemically stable state to an oxidation-sensitive state, and providing the prerequisite for subsequent oxidative degradation and structural deterioration.

[0038] In the chemical aging stage, the oxidation induction time (OIT) of the pipe samples was measured. OIT is the time before a significant exothermic oxidation reaction occurs under specified heating rates and oxygen atmosphere conditions. By comparing the rate of change or relative retention of OIT at different aging times, the degree of antioxidant depletion is quantitatively characterized, for example, by using one of the following indicators: OIT retention rate = OIT t / OIT0, OIT decay rate = ΔOIT / Δt When OIT decreases significantly while the carbonyl index remains stable, the pipe is determined to be in the first aging stage.

[0039] In the second stage, as antioxidants are further depleted, polymer molecular chains begin to oxidize and break down, leading to a decrease in molecular weight and deterioration of molecular structure. Under continuous internal pressure or external load, microporous structures gradually form in localized stress concentration areas, and initial microcracks appear on the surface of the pipe. During this stage, the material's ductility decreases significantly, and chemical degradation and mechanical response become coupled, gradually transforming the pipe from an aging state dominated by chemical aging to one dominated by structural deterioration.

[0040] At the chemical aging stage, the carbonyl index (CI) of the pipe is measured. The CI is calculated by the ratio of the carbonyl absorption peak intensity to the reference peak intensity in the infrared spectrum. For example:

[0041] in, The area or height of the characteristic absorption peak of the carbonyl group. The peaks are characteristic of the polymer backbone. The appearance or sustained increase of CI is used to quantitatively characterize the degree of polymer oxidative degradation.

[0042] At the structural degradation level, the following methods were used to quantitatively characterize the microcrack initiation behavior: The rate of change of the contact angle is calculated by measuring the water contact angle on the inner wall of the pipe. ; The initial contact angle, The current contact angle is represented by the above parameters, which reflect the influence of surface polarity enhancement and chemical degradation on surface properties.

[0043] The statistical analysis of crack density and crack size was conducted by using a scanning electron microscope (SEM) to capture multi-field images of the pipe surface and then using image analysis software to identify and statistically analyze the cracks, obtaining one or more of the following quantitative parameters: Crack density (ρ): The number of cracks per unit area (cracks / mm²); Average crack length (L): the arithmetic mean of crack lengths; Crack area fraction (A(crack): The proportion of the total crack area to the area of ​​the observed region.

[0044] The above parameters are used to characterize the evolution process of microcracks from non-existent to present and from few to many.

[0045] In the third stage, the existing microcracks expand and connect under the synergistic effect of the chemical medium and sustained stress. The cracks gradually develop into macroscopic defects and become channels for chemical substances to penetrate into the pipe wall, thereby accelerating the continuous deterioration of the internal structure of the material. With the significant increase in crack length and crack density, the overall load-bearing capacity of the pipe rapidly decreases, eventually leading to slow crack growth or sudden fracture failure.

[0046] Key performance indicators and calculation methods: At the macroscopic performance level, the pipe is characterized through tensile strength testing or pressure resistance testing to obtain one or more of the following parameters: ,in, For tensile strength, The initial tensile strength; the decrease in elongation at break; the decay rate of burst pressure or long-term pressure resistance time; and finally, the growth rate of crack length with aging time using SEM, are used to determine whether the crack has entered the propagation-dominant stage and to characterize the risk of brittle failure of the pipe.

[0047] More preferably, the aging damage function and time satisfy a kinetic relationship: Where k is the environmentally relevant aging rate coefficient and n is the aging index; when the overall damage reaches the preset failure threshold D crit If the pipeline reaches the end of its lifespan or enters a high-risk failure state, it is determined that the pipeline has reached the end of its lifespan.

[0048] More preferably, the failure threshold The value range is 0.8 to 1.2; where, when When the value is 1.0, the pipeline is considered to have reached the end of its design life.

[0049] More preferably, the comprehensive aging damage function predicts the service life t. f It can be calculated using the following formula:

[0050] The model extrapolates the performance degradation trend to achieve scientific prediction and health assessment of the remaining life of plastic water supply pipes in a chlorine-containing environment. The evolution rate of the comprehensive aging damage function is characterized by the environmentally related aging rate coefficient k. The aging rate coefficient is not a fixed constant, but a function parameter related to the temperature T, internal pressure P and redox potential in the service environment of the water supply pipe, which is used to reflect the difference in the cumulative rate of aging damage per unit time under different environmental conditions. The aging rate coefficient It can be determined in the following form:

[0051] in, The aging rate coefficient is the reference operating condition, which is a preset reference temperature, reference pressure and reference redox potential. , and These are the effects of temperature, pressure, and redox potential on the aging rate, respectively. Temperature effect function f T (T) shall be determined in the following manner: Among them, E a Here, is the apparent activation energy for aging, and RT is the gas constant. The pressure effect function characterizes the promoting effect of internal pressure or load on material aging and microcrack formation; its form can be expressed as a power function or an exponential function. The redox potential effect function characterizes the effect of oxidizing capacity in a residual chlorine environment on the chemical aging rate of the material; its form can be determined through experimental fitting.

[0052] In this invention, when the comprehensive aging damage function Reaching the preset failure threshold When the time is right, it is determined that the plastic water supply pipe has reached the end of its lifespan or has entered a high-risk state of failure.

[0053] The failure threshold The threshold for engineering judgment is determined comprehensively based on the pipeline material type, service conditions, and life judgment criteria.

[0054] Specifically, this invention provides an aging system for plastic water supply pipes in a chlorine-containing environment that simulates actual operating conditions. The system comprises a temperature control system, a pressure control system, a chlorine-containing water supply system, a sample tube exposure unit, an online monitoring system, and a data acquisition and control system.

[0055] The temperature control system includes a heating module and a temperature control module. The heating module includes water heating and space heating. The temperature control module includes water temperature control and space temperature control. Temperature feedback from temperature sensors located in the water storage tank and the space insulation device is used to adjust the power of the heating module through PID temperature control to ensure stable water and space temperatures.

[0056] The pressure control system maintains the pressure inside the sample tube through a circulating water pump and a frequency converter.

[0057] The online monitoring device monitors the oxidation-reduction potential (ORP) and free chlorine concentration in real time, and corrects deviations by automatically adjusting the proportion of chlorine-containing water injected, ensuring the stability of the experimental environment during long-term operation.

[0058] The sample tube exposure unit includes a sample tube fixing assembly, a water inlet interface, a water outlet interface, and a sealing connection assembly. The pipe sample to be tested is fixed inside the exposure unit by the sample tube fixing assembly, allowing the chlorine-containing water medium to flow inside the pipe sample.

[0059] The data acquisition and control system includes a sensor module, a data acquisition module, a control module, and a human-machine interaction module. The sensor module is used to collect parameters such as water temperature, flow rate, pressure, disinfectant concentration, and running time. The data acquisition module is used to summarize and store the data collected by the sensors.

[0060] The chlorinated water supply system includes a raw water supply module, a disinfectant dosing module, a mixing module, and a conveying module. The disinfectant dosing module is used to add sodium hypochlorite, chlorine dioxide, or other chlorine-containing disinfectants to the raw water.

[0061] The present invention provides an aging test device for plastic water supply pipes in a chlorine-containing environment and a method for life prediction and comprehensive assessment of drinking water safety. By simulating the operating conditions of residual chlorine, water temperature, pressure and flow rate in an actual water supply system, the device simulates the stable aging of plastic water supply pipes in a long-term chlorine-containing environment. Based on multi-level aging characterization parameters, a quantitative relationship between pipe aging and lifespan decline is established. At the same time, the potential impact of organic matter released during the aging process on drinking water safety is assessed, thereby providing a reliable technical means for life management of plastic water supply pipes and ensuring drinking water safety.

[0062] The method in this invention introduces a comprehensive hazard index, combining the complex types and concentrations of organic matter with drinking water health standards to achieve a quantitative assessment of the health risks of leaching from aging pipe materials. This is more comprehensive than simply looking at whether the concentration exceeds the standard, and can comprehensively reflect the potential risks when multiple harmful substances coexist.

[0063] Example 2 Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the plastic water supply pipe life prediction and drinking water safety comprehensive assessment system disclosed in an embodiment of the present invention. Figure 2 As shown, the lifespan prediction and drinking water safety comprehensive assessment system for plastic water supply pipes may include: Acquisition module 21: used to acquire the detection parameters of polyolefin pipes during the testing and evaluation process, and to dynamically adjust the operating parameters according to the detection parameters to simulate the actual operating conditions of the water supply network; Acquisition module 22: used to collect water samples from the outlet of the sample tube exposure unit and pipe samples at the corresponding aging time points at the set aging time points. Analysis module 23: Used to analyze organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry to determine the types and corresponding concentrations of organic matter precipitated at the corresponding aging time points; Assessment module 24: is used to determine the corresponding comprehensive hazard index based on the types of organic matter precipitated at the corresponding aging time points, their corresponding concentrations, and the corresponding health reference concentrations; and compares the comprehensive hazard index with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

[0064] The method in this invention introduces a comprehensive hazard index, combining the complex types and concentrations of organic matter with drinking water health standards to achieve a quantitative assessment of the health risks of leaching from aging pipe materials. This is more comprehensive than simply looking at whether the concentration exceeds the standard, and can comprehensively reflect the potential risks when multiple harmful substances coexist.

[0065] Example 3 Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. The electronic device can be a computer, a server, etc. Of course, in certain cases, it can also be a mobile phone, tablet computer, monitoring terminal, or other smart device, as well as an image acquisition device with processing capabilities. Figure 3 As shown, the electronic device may include: Memory 510 storing executable program code; Processor 520 coupled to memory 510; The processor 520 calls the executable program code stored in the memory 510 to execute some or all of the steps in the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety in Embodiment 1.

[0066] This invention discloses a computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps in the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety in Embodiment 1.

[0067] This invention also discloses a computer program product, wherein when the computer program product is run on a computer, the computer performs some or all of the steps in the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety in Embodiment 1.

[0068] This invention also discloses an application publishing platform, which is used to publish computer program products. When the computer program products are run on a computer, the computer executes some or all of the steps in the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety in Embodiment 1.

[0069] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0070] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0071] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0072] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of the present invention.

[0073] In the embodiments provided by this invention, it should be understood that B corresponding to A means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0074] Those skilled in the art will understand that some or all of the steps in the various methods of the embodiments described can be implemented by a program instructing related hardware. This program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0075] The foregoing has provided a detailed description of the method, system, electronic equipment, and storage medium for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, as disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, characterized in that, include: The test parameters of polyolefin pipes are obtained during the testing and evaluation process, and the operating parameters are dynamically adjusted according to the test parameters to simulate the actual operating conditions of the water supply network. At the set aging time points, water samples were collected from the water outlet of the sample tube exposure unit, as well as pipe samples at the corresponding aging time points. Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types and corresponding concentrations of organic matter precipitated at the corresponding aging time points. The comprehensive hazard index is determined based on the types and concentrations of organic matter precipitated at corresponding aging time points and the corresponding health reference concentrations; the comprehensive hazard index is then compared with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

2. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 1, characterized in that, The testing and evaluation process includes: starting the chlorine-containing water supply system, allowing the chlorine-containing water to continuously flow through the sample tube exposure unit under a set flow condition, and contacting the inner wall of the pipe sample under set temperature, pressure and flow rate conditions, so that the polyolefin pipe is continuously exposed to and accelerated to age in a residual chlorine environment. The method of analyzing organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry (GC-MS) to determine the types and corresponding concentrations of organic matter precipitated at specific aging time points includes: Gas chromatography-mass spectrometry was used to analyze the organic matter precipitated from the aging of water supply pipes to determine the types of organic matter precipitated at the corresponding aging time points; The concentration of each organic compound at the corresponding aging time point is determined based on the type of organic compound, the aging time point, and a pre-established functional relationship between precipitation behavior and aging time; wherein, the functional relationship between precipitation behavior and aging time is: ， Where t1 and t2 represent the critical time points of adjacent aging stages, and The evolution coefficient associated with the i-th precipitated organic compound. This represents the maximum level of organic matter that can be released during the aging process. This represents the precipitation concentration during the later, stable phase.

3. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 2, characterized in that, The formula for calculating the comprehensive hazard index is as follows: ;in, Let i be the health reference concentration for the i-th substance. denoted as , where n is the concentration of organic matter and n is the number of different types of organic matter. When the comprehensive hazard index HI(t) exceeds the set threshold, the water supply pipe at the aging time point is determined to pose a potential health hazard to drinking water.

4. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 3, characterized in that, The test evaluation method further includes: By synergistically analyzing the decay characteristics of oxidation-induced time, carbonyl exponential growth characteristics, crack density and crack size evolution characteristics, and macroscopic mechanical property decay characteristics, a comprehensive aging damage function is constructed. The comprehensive aging damage function is as follows: ,in These are weighting coefficients that sum to 1. The weights are determined based on experimental fitting or engineering experience. Antioxidant depletion factor; It is a chemical oxidizing factor. It is a surface polarity degradation factor. As a microstructural damage factor, ) is the mechanical parameter attenuation factor.

5. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 4, characterized in that, The overall aging damage function and time satisfy a kinetic relationship: Where k is the environmentally relevant aging rate coefficient and n is the aging index; when the overall damage reaches the preset failure threshold D crit If the pipeline reaches the end of its lifespan or enters a high-risk failure state, it is determined that the pipeline has reached the end of its lifespan.

6. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 5, characterized in that, The failure threshold =1, and ,in, =0.1~0.2; when When the value is 1.0, the pipeline is considered to have reached the end of its design life.

7. The method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in claim 5, characterized in that, The comprehensive aging damage function predicts the service life t f It can be calculated using the following formula: ; Among them, the evolution rate of the comprehensive aging damage function is characterized by the environmentally related aging rate coefficient k. The aging rate coefficient is not a fixed constant, but a function parameter related to the temperature T, internal pressure P and redox potential in the service environment of the water supply pipeline, which is used to reflect the difference in the cumulative rate of aging damage per unit time under different environmental conditions. The aging rate coefficient It can be determined in the following form: ， in, The aging rate coefficient is the reference operating condition, which is a preset reference temperature, reference pressure and reference redox potential. , and These are the effects of temperature, pressure, and redox potential on the aging rate, respectively. Temperature effect function f T (T) shall be determined in the following manner: Among them, E a RT is the apparent activation energy for aging, and RT is the gas constant.

8. A system for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety, characterized in that, include: Acquisition module: used to acquire the detection parameters of polyolefin pipes during the testing and evaluation process, and to dynamically adjust the operating parameters based on the detection parameters to simulate the actual operating conditions of the water supply network; Acquisition module: Used to collect water samples from the outlet of the sample tube exposure unit and pipe samples at the corresponding aging time points at the set aging time points. Analysis module: Used to analyze organic matter precipitated from aging water supply pipes using gas chromatography-mass spectrometry to determine the types and concentrations of organic matter precipitated at the corresponding aging time points; Assessment module: used to determine the corresponding comprehensive hazard index based on the types and concentrations of organic matter precipitated at the corresponding aging time points and the corresponding health reference concentrations; and to compare the comprehensive hazard index with the set conditions to determine whether the water supply pipeline poses a hazard to drinking water during the aging process.

9. An electronic device, characterized in that, include: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program causes a computer to execute the method for predicting the lifespan of plastic water supply pipes and comprehensively assessing drinking water safety as described in any one of claims 1 to 7.

Images