Multi-index weighted evaluation method and device for chemical cleaning effect of reverse osmosis membrane

Abstract

The application discloses a kind of multi-index weighted evaluation method and device for reverse osmosis membrane chemical cleaning effect, belong to water treatment technical field.First, the key operating parameters before and after cleaning are collected and the standardized indicators are calculated;Further, according to the standardized water production recovery rate, water production rate, inter-stage pressure difference drop rate and desalination rate stability, combined with the preset weight rule, each single score is calculated, wherein the standardized water production recovery rate has the highest weight, and the desalination rate stability is used as a veto index;Finally, the overall performance recovery score is obtained by weighting and summing each single score, and the cleaning effect level is divided according to the score interval division.The application realizes scientific, quantitative and comprehensive determination of cleaning effect, improves the accuracy and operability of evaluation.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a multi-index weighted evaluation method, apparatus, equipment, and storage medium for the chemical cleaning effect of reverse osmosis membranes. Background Technology

[0002] Reverse osmosis membranes, as the core separation component of modern water treatment systems, play an irreplaceable and crucial role in many fields such as seawater desalination, industrial pure water production, wastewater reuse, and drinking water purification. However, during long-term operation, the membrane surface and flow channels are highly susceptible to the combined accumulation and adsorption of various pollutants, including microorganisms, colloidal particles, inorganic salt scaling, and organic macromolecules. This leads to a series of problems such as continuous decline in membrane flux, gradual decrease in desalination performance, and significant increase in inter-stage operating pressure differential. This not only directly reduces the system's water production efficiency and water quality stability but also causes a sharp increase in operating energy consumption and a shortened lifespan of membrane elements, seriously affecting the economy and reliability of the entire water treatment process.

[0003] Periodic chemical cleaning has become a widely adopted key maintenance measure in the industry to restore membrane module performance. However, current assessments of the effectiveness of chemical cleaning often suffer from problems such as one-sided methods, insufficient quantification, and a lack of standards. Conventional industry practices often rely solely on the intuitive change in a single operating parameter—permeate flow—for empirical judgment, neglecting the comprehensive impact of multiple key indicators such as desalination rate, pressure changes, and water quality stability. This evaluation method based on a single point-like indicator cannot comprehensively and objectively reflect the degree of recovery of the overall membrane system performance after cleaning, and cannot scientifically diagnose and accurately quantify the effectiveness of the cleaning process. Its limitations directly hinder the optimization and adjustment of cleaning operating parameters, the establishment of standardized management processes, and the formulation of long-term operation and maintenance strategies, thus restricting further improvements in the efficiency and economic benefits of reverse osmosis systems.

[0004] Therefore, in view of the technical deficiencies in the existing chemical cleaning effect evaluation, such as the single indicator and lack of systematic comprehensive analysis, the industry urgently needs to build a scientific, comprehensive, quantifiable and standardized multi-indicator weighted comprehensive evaluation system, in order to achieve objective and accurate judgment of cleaning effect and provide a reliable basis for the optimization and standardization of cleaning process. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] To address this, this invention proposes a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes. This method involves collecting key operating parameters before and after cleaning and calculating standardized indicators to quantify standardized permeate flow recovery rate, permeate flow increase rate, inter-stage pressure difference decrease rate, and desalination stability. Each indicator's score is calculated according to a preset weighting rule, with the standardized permeate flow recovery rate having the highest weight and desalination stability serving as a veto indicator. Finally, a weighted sum is obtained to obtain the overall performance recovery score, and the cleaning effect is graded based on the scoring range to achieve a scientific and comprehensive assessment of the cleaning effect.

[0007] Another objective of this invention is to provide a multi-index weighted evaluation device for the chemical cleaning effect of reverse osmosis membranes.

[0008] The third objective of this invention is to provide a computer device.

[0009] A fourth objective of this invention is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, this invention proposes a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, comprising: S1 collects key operating parameters of the reverse osmosis system before and after cleaning, including permeate volume, operating pressure, water temperature, and conductivity, and calculates standardized permeate volume, inter-stage pressure difference, and desalination rate based on the initial commissioning state. S2, calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, calculate the water production increase rate based on the difference in water production before and after cleaning, calculate the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and calculate the desalination rate stability based on the difference in desalination rate before and after cleaning. S3. Based on the weighting rules for each indicator, calculate the individual scores for the standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination rate stability respectively; among them, the standardized permeable water recovery rate has the highest weight, and the desalination rate stability is used as a veto indicator. S4 calculates the weighted sum of the individual scores to obtain the overall performance recovery score, and classifies the cleaning effect level according to the preset scoring range to determine whether the cleaning was successful.

[0011] The multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes according to an embodiment of the present invention may also have the following additional technical features: In one embodiment of the present invention, the collection of key operating parameters of the reverse osmosis system before and after cleaning, including permeate volume, operating pressure, water temperature, and conductivity, and the calculation of standardized permeate volume, inter-stage pressure difference, and desalination rate based on the initial commissioning state, includes: S11. When collecting water production data before and after cleaning, water temperature, operating pressure and conductivity data are recorded simultaneously, and the water production data is standardized to eliminate the interference of operating parameter fluctuations on the evaluation results. S12, When calculating the pressure difference between sections, the absolute values ​​of the pressure difference between each section before and after cleaning are compared to ensure the quantitative accuracy of the pressure difference change.

[0012] In one embodiment of the present invention, the steps of calculating the standardized permeable water recovery rate based on the ratio of the standardized permeable water volume to the initial standardized permeable water volume, calculating the permeable water volume increase rate based on the difference in permeable water volume before and after cleaning, calculating the inter-stage pressure difference decrease rate based on the difference in inter-stage pressure difference before and after cleaning, and calculating the desalination rate stability based on the difference in desalination rate before and after cleaning include: S21, When calculating the standardized permeate flow recovery rate, a formula is used and its target value is set to ≥80% to assess the degree of permeate flow recovery relative to the new membrane state: ; S22, When calculating the stability of the desalination rate, the fluctuation range of the desalination rate change after washing should be controlled within a certain range. A score of 100% is awarded when the change is within 0% and the change value is ≥0%.

[0013] In one embodiment of the present invention, based on the weighting rules corresponding to each indicator, the individual scores for standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination stability are calculated respectively; wherein, the standardized permeable water recovery rate has the highest weight, and desalination stability is used as a veto indicator, including: S31, when calculating the standardized water production recovery rate score, when Scored 40 points, when At that time, the score is calculated linearly according to the formula: ; when At that time, the score is calculated using a weighted reduction formula: ; S32, when calculating the score for the rate of decrease in inter-segment pressure difference, when 30 points, when At that time, the score is calculated linearly according to the formula. ; when At that time, the score is calculated using a weighted reduction formula: .

[0014] In one embodiment of the present invention, it further includes: S5. Adjust the cleaning process parameters based on the overall performance recovery score S. When S < 80, generate optimization suggestions for the cleaning solution, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

[0015] To achieve the above objectives, another aspect of the present invention provides a multi-index weighted evaluation device for the chemical cleaning effect of reverse osmosis membranes, comprising: The data acquisition and parameter calculation module is used to collect key operating parameters of the reverse osmosis system before and after cleaning, such as permeate volume, operating pressure, water temperature and conductivity, and to calculate standardized permeate volume, inter-stage pressure difference and desalination rate based on the initial commissioning state. The indicator calculation module is used to calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, the water production increase rate based on the difference in water production before and after cleaning, the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and the desalination rate stability based on the difference in desalination rate before and after cleaning. The weighting and score calculation module is used to calculate the individual scores of standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination stability based on the weighting rules corresponding to each indicator. Among them, the standardized permeable water recovery rate has the highest weight, and desalination stability is used as a veto indicator. The comprehensive scoring and rating module is used to sum the scores of each item by weight to obtain the overall performance recovery score, and to classify the cleaning effect level according to the preset scoring range to determine whether the cleaning is successful.

[0016] In one embodiment of the present invention, it further includes: The process parameter adjustment module is used to adjust the cleaning process parameters according to the overall performance recovery score S. When S < 80, it generates optimization suggestions for the cleaning scheme, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

[0017] This invention discloses a multi-index weighted evaluation method and apparatus for the chemical cleaning effect of reverse osmosis membranes. By constructing a standardized, multi-dimensional, and quantifiable comprehensive evaluation index system, it effectively overcomes the technical shortcomings of traditional methods that rely on single indicators, have one-sided evaluations, and lack scientific quantitative basis. It achieves a systematic and objective process throughout the entire process, from key parameter collection, standardized processing, core index calculation, weight allocation and scoring to final comprehensive rating. This invention not only enables scientific diagnosis and precise quantitative judgment of cleaning effects but also adaptively adjusts and optimizes cleaning process strategies based on evaluation results, forming a closed-loop management of "evaluation-judgment-optimization," significantly improving the scientific rigor, economy, and operational reliability of reverse osmosis system cleaning operations.

[0018] To achieve the above objectives, a third aspect of this application provides a computer device comprising a processor and a memory; wherein the processor reads executable program code stored in the memory to run a program corresponding to the executable program code, for implementing a multi-index weighted evaluation method for the chemical cleaning effect of a reverse osmosis membrane as described in the first aspect embodiment.

[0019] To achieve the above objectives, the fourth aspect of this application provides a non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements a multi-index weighted evaluation method for the chemical cleaning effect of a reverse osmosis membrane as described in the first aspect embodiment.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a multi-index weighted evaluation method for the chemical cleaning effect of a reverse osmosis membrane according to an embodiment of the present invention; Figure 2 This is a diagram illustrating a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes according to an embodiment of the present invention. Figure 3 This is a schematic diagram of a multi-index weighted evaluation device for the chemical cleaning effect of a reverse osmosis membrane according to an embodiment of the present invention; Figure 4 It is a computer device according to an embodiment of the present invention. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0024] The following description, with reference to the accompanying drawings, describes a multi-index weighted evaluation method, apparatus, equipment, and storage medium for the chemical cleaning effect of reverse osmosis membranes according to embodiments of the present invention.

[0025] The core idea of ​​this invention is to transform the assessment of the chemical cleaning effect of reverse osmosis membranes from empirical observation relying on a single permeate flow rate to an objective and scientific diagnosis based on multi-indicator synergistic analysis and weighted decision-making by constructing a standardized, multi-dimensional, and quantifiable comprehensive evaluation system. First, the system collects key operating parameters before and after cleaning and calculates standardized permeate flow rate, inter-stage pressure difference, and desalination rate to eliminate interference from operating condition fluctuations. Then, it quantifies and calculates four core evaluation indicators: standardized permeate flow recovery rate, permeate flow rate increase rate, inter-stage pressure difference decrease rate, and desalination rate stability. Using a preset weighting rule (where standardized permeate flow recovery rate has the highest weight and desalination rate stability is a veto indicator), scores are calculated for each indicator, and finally, a weighted sum is obtained to obtain the overall performance recovery score. The effect is then judged according to a preset level. Thus, this invention forms a complete closed loop from data collection, indicator quantification, weighting allocation to comprehensive rating, achieving a scientific, accurate, and comprehensive evaluation of the cleaning effect and providing a reliable basis for the optimization and standardized management of the cleaning process.

[0026] Example 1 To achieve the above invention, embodiments of the present invention provide a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, such as... Figure 1 As shown, it includes: S1 collects key operating parameters of the reverse osmosis system before and after cleaning, including permeate volume, operating pressure, water temperature, and conductivity. Based on the initial commissioning state, it calculates standardized permeate volume, inter-stage pressure difference, and desalination rate.

[0027] Specifically, the technical principle behind this step is to systematically collect key operating parameters before and after cleaning, eliminate the interference of differences in operating conditions on performance evaluation, and thus achieve standardized and comparable analysis of the degree of membrane performance recovery.

[0028] Specifically, this step should be performed after the chemical cleaning process is completed and the system has returned to a stable operating state (generally recommended to run for more than 24 hours). Key operating parameters to be collected include: permeate flow rate (m³ / h), operating pressure (MPa), water temperature (°C), and conductivity (μS / cm). These parameters reflect the operating status of the membrane system and the water quality characteristics, and are the basis for subsequent calculations of standardized permeate flow rate, inter-stage pressure difference, and desalination rate.

[0029] Furthermore, the calculation of standardized permeate volume needs to be based on the baseline value under the initial operation state of the membrane, and the standardization process is usually performed using the following formula: ; in, and These represent the initial commissioning and current operational pressures, respectively. and This corresponds to the water temperature. This formula eliminates the impact of operating pressure and temperature fluctuations on water production, enabling a fair comparison of performance before and after cleaning.

[0030] Furthermore, the inter-section pressure difference is calculated by collecting the inlet and outlet pressure differences of each membrane module before and after cleaning, and its rate of decrease reflects the degree of removal of pollutants in the membrane channel. The desalination rate is calculated based on the ratio of the conductivity of the permeate to that of the feed water, and its stability is an important basis for judging whether the membrane material is damaged.

[0031] Specifically, this step is typically implemented in industrial water treatment systems (such as power plants, desalination plants, and municipal water supply systems), and is applicable to multi-stage reverse osmosis systems or single-stage systems. By collecting data before and after cleaning and performing standardized processing, a reliable basis can be provided for subsequent multi-index weighted scoring, ensuring the scientific nature and repeatability of the cleaning effect evaluation.

[0032] Specifically, by introducing standardized calculation methods, the interference of changes in the operating environment on water production is effectively eliminated, making the evaluation of cleaning effect more objective. At the same time, by collecting multi-dimensional operating parameters, complete data support is provided for the subsequent comprehensive evaluation system, which is a prerequisite for realizing quantitative analysis of cleaning effect.

[0033] Furthermore, S1 includes: S11. When collecting water production data before and after cleaning, water temperature, operating pressure and conductivity data are recorded simultaneously, and the water production data is standardized to eliminate the interference of operating parameter fluctuations on the evaluation results.

[0034] Specifically, the core of this step is to simultaneously acquire parameters such as water production, operating pressure, water temperature, and conductivity to eliminate the interference of differences in operating environment on the evaluation results and ensure the scientific nature and comparability of the evaluation system.

[0035] Furthermore, data acquisition should be conducted after the cleaning process is completed and the system has returned to a stable operating state. Typically, the system is required to operate continuously and stably for at least 24 hours to ensure that the membrane element performance reaches a steady state. During the data acquisition process, high-precision sensors should be used to monitor the permeate flow rate (m³ / h), operating pressure (MPa), water temperature (°C), and influent and permeate conductivity (μS / cm) in real time, and the corresponding data before and after cleaning should be recorded. A data acquisition frequency of once every 10 minutes is recommended to ensure data continuity and representativeness.

[0036] Specifically, the key parameters involved in this step include: the water production rate before and after cleaning. and Operating pressure and Water temperature and and conductivity and These parameters allow for the calculation of intermediate indicators such as standardized water production, inter-stage pressure difference, and desalination rate, laying the foundation for subsequent quantitative evaluation of cleaning effectiveness.

[0037] Specifically, this step is widely applicable to industrial water treatment systems, seawater desalination plants, municipal water supply systems, and other applications involving reverse osmosis membrane operation. Especially when membrane systems show signs of performance degradation, such as a significant decrease in permeate flow, abnormally high pressure differentials, or increased fluctuations in desalination rates, this data collection method can provide a basis for the scientific evaluation of the cleaning effect.

[0038] Specifically, this step, through standardization, effectively eliminates fluctuations in permeate flow caused by changes in operating conditions such as water temperature and pressure, making the performance comparison before and after cleaning more objective. Simultaneously, the collection of conductivity data provides necessary input for calculating the desalination rate, helping to determine whether the membrane's separation performance has recovered. Therefore, this step plays a crucial role in the overall technical solution, providing data support and establishing performance benchmarks, and is a prerequisite for achieving a weighted comprehensive evaluation of multiple indicators.

[0039] S12, When calculating the pressure difference between sections, the absolute values ​​of the pressure difference between each section before and after cleaning are compared to ensure the quantitative accuracy of the pressure difference change.

[0040] Specifically, this step quantifies the degree of restoration of the flow channel patency inside the membrane element by comparing the absolute values ​​of the pressure difference between each section before and after cleaning, thus providing an important basis for the comprehensive evaluation of the cleaning effect.

[0041] Furthermore, the calculation of the inter-stage pressure differential reduction rate is based on pressure data collected from the reverse osmosis system under stable operating conditions before and after cleaning. Specifically, before cleaning, the pressure differential between the feed water side and the concentrate side of each stage (e.g., stage one, stage two) needs to be recorded, denoted as... After cleaning, the system needs to be run again under the same operating conditions (such as the same water temperature, inlet pressure, recovery rate, etc.) and stabilized for more than 24 hours to ensure that the membrane elements fully recover. At this time, the inter-section pressure difference value after cleaning is recorded as . Pressure differential decrease rate The calculation formula is: .

[0042] Furthermore, this formula reflects the degree of removal of contaminants inside the membrane element by calculating the relative change in pressure difference before and after cleaning. A significant decrease in pressure difference indicates that physical blockages (such as inorganic salt scale, colloidal deposits, etc.) in the membrane channel have been effectively removed, thereby improving the flowability of the water channel and reducing the system's operating energy consumption.

[0043] Furthermore, the baseline requirement for the rate of decrease in inter-segment pressure differential is: Its weight accounts for 30% in the comprehensive scoring system. When When the time is right, you can get a full score of 30 points; if The score is then calculated using linear interpolation, with the following formula: .

[0044] like If the score is reduced proportionally, the formula is: .

[0045] Specifically, this step is widely applicable to reverse osmosis membrane operation scenarios such as industrial water treatment systems, seawater desalination plants, and wastewater reuse systems. Especially after the membrane system exhibits typical fouling symptoms such as decreased permeate flow and increased pressure differential, this indicator can quickly determine whether chemical cleaning has effectively restored the physical structural integrity of the membrane element, providing data support for optimizing subsequent cleaning strategies.

[0046] Specifically, the introduction of the inter-stage pressure differential reduction rate allows the evaluation of cleaning effectiveness to move beyond simply restoring permeate flow and instead to a quantitative analysis from the perspective of system operating resistance. This indicator is highly sensitive to the removal of deposits inside membrane elements, helping to identify the permeability and dispersibility of cleaning agents and the rationality of the cleaning process, thereby improving the scientific rigor and repeatability of the cleaning process.

[0047] S2, calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, calculate the water production increase rate based on the difference in water production before and after cleaning, calculate the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and calculate the desalination rate stability based on the difference in desalination rate before and after cleaning.

[0048] Specifically, the technical implementation of this step is based on standardized operating parameters, combined with comparative analysis of data before and after cleaning, thereby constructing a scientific and repeatable evaluation system.

[0049] Furthermore, the standardized water production recovery rate The calculation method is as follows: This indicator compares the permeate flow rate after cleaning with the standardized permeate flow rate at the initial commissioning of the membrane system, eliminating the interference of external factors such as water temperature and pressure during operation, thus more accurately reflecting the long-term flux recovery capability of the membrane element. Its baseline requirement is... In practical applications, if the recovery rate is lower than this threshold, it may indicate that membrane fouling has caused irreversible damage.

[0050] Furthermore, the rate of increase in water production The calculation formula is: This indicator is used to evaluate the effect of cleaning on improving the instantaneous water production capacity of the membrane system, and its baseline requirement is... In practice, this indicator is often used to determine whether cleaning has effectively removed short-term blockages, thereby quickly restoring system operating efficiency.

[0051] Furthermore, the rate of decrease in inter-segment pressure differential The calculation method is as follows: This indicator reflects the degree of removal of physical fouling within the membrane flow channel, with a baseline requirement of [missing information]. A significant decrease in pressure differential indicates improved permeability of the membrane surface and internal channels, which helps reduce system energy consumption and extend membrane life.

[0052] Furthermore, the stability of the desalination rate The calculation method is as follows: This indicator is used to assess whether the selective separation function of the membrane element remains stable or recovers during the cleaning process; its ideal state is... And the fluctuation range should be controlled within Within 0.5%. If the desalination rate decreases by more than 0.5%, it may indicate that the membrane material has been damaged during the cleaning process, which should be taken seriously.

[0053] Specifically, through the calculation of the above four indicators, the present invention achieves a multi-dimensional and systematic evaluation of the reverse osmosis membrane cleaning effect, providing key data support for the optimization and standardized management of the cleaning process.

[0054] Furthermore, S2 includes: S21, When calculating the standardized permeate flow recovery rate, a formula is used and its target value is set to ≥80% to assess the degree of permeate flow recovery relative to the new membrane state: .

[0055] Specifically, this indicator quantifies the degree of membrane water production capacity recovery as a percentage by comparing the ratio of the standardized water production after cleaning to the initial standardized water production during operation. This eliminates the impact of fluctuations in external conditions such as water temperature and operating pressure on water production during operation, thus enabling long-term and stable evaluation of membrane performance.

[0056] Furthermore, the calculation of standardized permeate flow rate needs to be based on the permeate flow capacity of the membrane system under standard operating conditions, typically using the permeate flow rate at the initial commissioning of the membrane as the baseline value. After cleaning, the system needs to operate stably for a period of time (generally 24 hours) under the same or similar operating conditions (such as temperature, pressure, feed water conductivity, etc.) to ensure the representativeness of the collected data. Subsequently, the calculation is performed using the formula... Calculate the standardized permeate recovery rate. The standardized permeate in this formula is usually calculated using a membrane performance correction model, such as a standardized formula provided by the membrane manufacturer, to correct the actual permeate to the equivalent value at standard temperature (e.g., 25°C) and standard pressure.

[0057] Specifically, the present invention addresses... A clear benchmark requirement was set: the recovery rate should be ≥80% to ensure that the membrane element has basic performance recovery capability after cleaning. Furthermore, if the recovery rate is ≥90%, the membrane performance is considered to have recovered well, and a full score of 40 points is awarded for this indicator; if the recovery rate is between 80% and 90%, a linear interpolation method is used to calculate the score, using the following formula: [Score]. If the recovery rate is below 80%, the score will decrease proportionally, as shown in the formula: Score .

[0058] Specifically, this indicator is widely applicable to evaluating the cleaning effect of reverse osmosis membranes in industrial water treatment, seawater desalination, and municipal water supply systems. Especially in systems with long membrane operating cycles and severe fouling accumulation, the standardized permeate recovery rate can effectively reflect the long-term performance degradation trend of membrane elements, providing data support for optimizing cleaning frequency and predicting membrane life.

[0059] Specifically, the introduction of the standardized permeate recovery rate means that the evaluation of cleaning effectiveness is no longer limited to short-term permeate increase, but rather focuses on the long-term performance recovery of membrane elements, enhancing the scientific and systematic nature of the evaluation. This indicator accounts for 40% of the weight in the multi-indicator weighted scoring system, reflecting its core position in the comprehensive evaluation and contributing to the standardized management and continuous optimization of the cleaning process.

[0060] S22, When calculating the stability of the desalination rate, the fluctuation range of the desalination rate change after washing should be controlled within a certain range. A score of 100% is awarded when the change is within 0% and the change value is ≥0%.

[0061] Specifically, the technical principle of this step is based on the control of the difference in desalination rate before and after cleaning and its fluctuation range. The aim is to determine whether the membrane material is damaged by the cleaning operation through quantitative means, thereby ensuring the long-term operating performance of the membrane system.

[0062] Furthermore, the desalination rate stability is defined as the difference between the desalination rate after washing and the desalination rate before washing, i.e. This indicator requires that the fluctuation range of the desalination rate after washing be controlled within a certain range. Within, and the change value A perfect score of 10 points is awarded for each step. If the desalination rate decreases but the decrease is less than 0.5%, 5 points are awarded; if the decrease exceeds 0.5%, 0 points are awarded. This scoring mechanism ensures strict monitoring of membrane performance and prevents abnormal decreases in desalination rate caused by damage to the membrane material structure due to excessively high cleaning agent concentration or improper cleaning conditions.

[0063] Furthermore, the stability of the desalination rate requires that the fluctuation range of the desalination rate after washing does not exceed [a certain value]. This threshold is set based on the performance variation range of the membrane material under normal operating conditions, and has strong engineering applicability. In practical applications, this step is usually performed 24 hours after the system has been running stably following cleaning to ensure the representativeness and accuracy of the desalination rate measurement. The desalination rate measurement before and after cleaning must be carried out under the same operating conditions, such as the same water temperature and the same influent conductivity, to eliminate the influence of external variables on the results.

[0064] Specifically, desalination rate is a core parameter for evaluating membrane separation performance, and its stability directly reflects the integrity of the membrane surface structure and functional layers. A significant decrease in desalination rate may indicate damage to the membrane pore structure or irreversible chemical changes in the membrane material. In such cases, even if permeate flow and differential pressure are good, the cleaning effect cannot be considered satisfactory. Therefore, incorporating desalination rate stability into the scoring system and setting a strict fluctuation range helps improve the scientific rigor and comprehensiveness of the cleaning effect evaluation, providing crucial data for optimizing subsequent cleaning processes.

[0065] S3. Based on the weight allocation rules corresponding to each indicator, calculate the individual scores for the standardized water production recovery rate, water production increase rate, inter-stage pressure difference decrease rate, and desalination stability, respectively. Among them, the standardized water production recovery rate has the highest weight, and the desalination stability is used as a veto indicator.

[0066] Specifically, this step is the core of achieving a multi-index weighted comprehensive evaluation of the chemical cleaning effect of the reverse osmosis membrane. Its technical principle is based on a weighted scoring model, which quantifies the recovery degree of different performance indicators into scores, and then sums these scores based on their weights to obtain the overall performance recovery score. This provides a scientific and intuitive basis for evaluating the cleaning effect.

[0067] Furthermore, based on the standardized water production, water output, inter-stage pressure difference, and desalination rate data collected before and after cleaning, four core indicators were calculated respectively. , , and Among them, the standardized water production recovery rate The weight of is 40%, which is the highest among the four indicators. Its score is calculated using a piecewise linear mapping method: when A score of 40 is awarded when... At that time, the score was... ;when At that time, the score was... This indicator reflects the ability of a membrane element to recover to its initial state through cleaning after long-term operation, and has important performance tracking value.

[0068] Furthermore, the rate of increase in water production The weight is 20%, and its score is calculated as follows: when A perfect score of 20 points is awarded when... At that time, the score was... ;when At that time, the score was... This indicator directly reflects the effect of cleaning on the system's instantaneous water production capacity and is an important parameter for evaluating the immediate benefits of cleaning.

[0069] Furthermore, the rate of decrease in inter-segment pressure differential The weight is 30%, and its score is calculated as follows: when A perfect score of 30 points is awarded when... At that time, the score was... ;when At that time, the score was... This indicator is used to assess the degree of removal of physical fouling in the membrane flow channel. The greater the decrease in pressure differential, the more significant the improvement in system operating energy consumption after cleaning.

[0070] Furthermore, the stability of the desalination rate The weight is 10%, but it has a veto effect. If the desalination rate is stable or increases (change value)... ), and fluctuations in A score of 10 is awarded if the desalination rate is within 0.5%; 5 points are awarded if the desalination rate decreases but the decrease is less than 0.5%; and 0 points are awarded if the desalination rate decreases more than 0.5%. This indicator is used to determine whether the selective separation function of the membrane element is damaged during the cleaning process and is a key control point to ensure the long-term stability of membrane performance.

[0071] Specifically, this step introduces a weighted scoring mechanism to unify the performance recovery effects across different dimensions into comparable values, thereby achieving a comprehensive quantitative assessment of the cleaning effect. In practical applications, this method is widely applicable to reverse osmosis membrane operation scenarios such as industrial water treatment systems, seawater desalination plants, and municipal water supply systems, providing reliable data support for cleaning process optimization, membrane element life prediction, and operation management. Its technical value lies in improving the scientific rigor and operability of cleaning effect evaluation, and promoting the standardization and intelligent development of membrane system maintenance.

[0072] Furthermore, S3 includes: S31, when calculating the standardized water production recovery rate score, when Scored 40 points, when At that time, the score is calculated linearly according to the formula: ; when At that time, the score is calculated using a weighted reduction formula: ; Specifically, the technical principle behind this step is based on linear interpolation, which involves measuring the actual data... The values ​​are mapped to a preset scoring range, thereby enabling a quantitative assessment of the degree of membrane water production capacity recovery after cleaning.

[0073] Specifically, the first step is to collect standardized permeable water production data before and after cleaning. Standardized permeable water production refers to the water production capacity calculated using standardized methods under uniform operating pressure, water temperature, conductivity, and other conditions. Its purpose is to eliminate the impact of differences in operating environments on permeable water production, ensuring the comparability and scientific validity of the assessment results. The calculation formula is as follows: .

[0074] Furthermore, when At this point, it indicates that the membrane element's water production capacity has recovered to near its initial state, demonstrating a significant cleaning effect; therefore, it is directly awarded a full score of 40 points. Meanwhile... Within the interval, the score is calculated using linear interpolation, i.e. This formula ensures that the score increases linearly with the recovery rate between the baseline (80%) and the excellent value (90%), reflecting the continuity and rationality of the scoring.

[0075] Specifically, the scoring mechanism for this step uses 80% as the minimum passing score and 90% as the excellent score, with a weighting of 40%, fully reflecting the dominant role of the standardized permeate recovery rate in the overall evaluation. In practical applications, this step is often used in industrial water treatment systems (such as power plants, seawater desalination plants, and municipal water supply systems) to quantitatively evaluate the cleaning effect of reverse osmosis membranes, providing data support for optimizing subsequent cleaning strategies.

[0076] Specifically, by introducing a standardized linear scoring mechanism for permeate recovery rate, not only is the objectivity of cleaning effect evaluation improved, but a quantitative basis for long-term monitoring of membrane performance is also provided. When the cleaning effect is unsatisfactory, this score can serve as an important reference for determining whether the cleaning agent needs to be replaced or the cleaning process adjusted, thereby achieving standardized and intelligent management of the cleaning process.

[0077] S32, when calculating the score for the rate of decrease in inter-segment pressure difference, when 30 points, when At that time, the score is calculated linearly according to the formula. ; when At that time, the score is calculated using a weighted reduction formula: .

[0078] Specifically, the technical principle of this step is based on the rate of change of pressure difference between the sections before and after cleaning. By quantitative analysis, it is determined whether the internal flow channels of the membrane element have been restored to unobstructed flow due to cleaning, thereby reflecting the potential for improvement in system operating energy consumption.

[0079] Furthermore, the formula for calculating the rate of decrease in inter-segment pressure differential is: ; in, This indicates the pressure difference between sections before cleaning. This represents the pressure difference between sections after cleaning, expressed in MPa. The baseline requirement for this indicator is... This means that the pressure difference between sections should decrease by 30% or more after cleaning, indicating that the contaminants in the membrane flow channel have been effectively removed.

[0080] Furthermore, in the weighted scoring phase, when When the time is right, the indicator scores a maximum of 30 points; when At that time, the score is calculated using the linear interpolation formula: .

[0081] Specifically, the formula embodies a scoring mechanism that progressively improves upon a baseline value, ensuring that subtle differences in cleaning effectiveness are quantified. For example, if... The score is then calculated as follows: point.

[0082] Specifically, this step is typically performed 24 hours after the reverse osmosis system has completed chemical cleaning and is operating stably. By collecting inter-section pressure difference data before and after cleaning, and combining this with standardized processing procedures, the effect of cleaning on restoring membrane flow channel patency can be accurately assessed. This indicator has a weight of 30% in the multi-indicator system, making it the second most important indicator after the standardized permeate flow recovery rate, reflecting its crucial role in system performance recovery.

[0083] Specifically, by quantifying the degree of decrease in inter-segment pressure difference, the effectiveness of clearing physical blockages inside membrane elements can be objectively reflected, providing a direct basis for judging the effectiveness of cleaning. At the same time, this scoring mechanism avoids subjective judgment, enhances the scientific rigor and repeatability of cleaning effect evaluation, and helps promote the standardization and optimization of cleaning processes.

[0084] S4 calculates the weighted sum of the individual scores to obtain the overall performance recovery score, and classifies the cleaning effect level according to the preset scoring range to determine whether the cleaning was successful.

[0085] Specifically, this step is the final output of the entire evaluation system, possessing high systematicity and decision support value. This step employs a linear weighted summation method to standardize the water production recovery rate. Water production increase rate Inter-segment pressure differential decrease rate and desalination stability The scores of the four indicators are integrated. Specifically, the scores of each indicator are first multiplied according to their corresponding weighting coefficients, and then all the product terms are summed to obtain the total score. For example, in an embodiment, The score is 42 points, with a weighting of 40%. The score is 20 points, with a weight of 20%. The score is 22.7 points, with a weighting of 30%. The score is 10 points, with a weight of 10%. The final calculation formula is: .

[0086] Furthermore, the scoring interval division in this step has a clearly defined threshold standard. Total Score The value range is from 0 to 100 points. Based on practical application experience, the following grade range is set: Excellent (90 points ≤ ≤ 100 points), Good (80 points ≤ <90 points), average (70 points ≤ <80 points), poor results (60 points ≤ <70 points), cleaning failed ( <60 points). These ranges reflect the degree to which the membrane system recovers its performance after cleaning, and have strong operability and engineering guidance significance.

[0087] Specifically, this step is widely applicable to evaluating the cleaning effect of reverse osmosis membranes in water treatment systems, especially in scenarios such as industrial pure water preparation, seawater desalination, and wastewater reuse. It provides operators with an intuitive basis for judging the cleaning effect. By converting complex multi-indicator data into unified scores and grades, it facilitates comparative analysis between different cleaning cycles, supporting continuous optimization and standardized management of the cleaning process.

[0088] Specifically, this step enables a comprehensive quantitative evaluation of the cleaning effect, avoiding the subjectivity and bias of traditional single-indicator judgments. The weighted scoring mechanism highlights the influence of key performance indicators, enhancing the scientific rigor and repeatability of the evaluation results. Simultaneously, the classification of cleaning effect levels provides clear decision boundaries, helping to promptly identify cleaning failures or unsatisfactory results, thereby enabling further cleaning measures or adjustments to the cleaning plan, improving system operating efficiency and membrane element lifespan.

[0089] S5. Adjust the cleaning process parameters based on the overall performance recovery score S. When S < 80, generate optimization suggestions for the cleaning solution, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

[0090] Specifically, this step involves dynamically adjusting the cleaning process parameters based on the comprehensive evaluation results of a multi-index weighted scoring system, combined with the type of membrane fouling, the nature of the pollutants, and the chemical properties of the cleaning agents, thereby optimizing the cleaning effect.

[0091] Specifically, this step first compares four core indicators before and after cleaning (standardized water production recovery rate). Water production increase rate Inter-segment pressure differential decrease rate Desalination rate stability The score of ) identifies key dimensions of insufficient performance recovery. For example, if A low score indicates that the long-term water production capacity of the membrane element has not been fully restored, which may be related to the ineffective removal of stubborn contaminants on the membrane surface. In this case, the system will suggest adjusting the concentration gradient of the cleaning agent and adopting a multi-stage concentration escalation cleaning strategy, such as gradually increasing the concentration of the alkaline cleaning agent from 0.1% to 0.3%, to enhance the removal capacity of inorganic scale and organic matter.

[0092] Furthermore, the dynamic extension of cleaning time is based on... and Based on the actual recovery situation, it is generally recommended to increase the cleaning time on top of the original cleaning time. For example, the standard cleaning time is reduced from Extended to or This is to ensure that pollutants are fully dissolved and flushed out of the membrane element. If If the desalination rate decreases by more than 0.5%, it indicates that the cleaning process may have damaged the membrane material. In this case, the system will suggest changing the type of cleaning agent, such as switching from a single alkaline cleaning agent to a compound cleaning agent (such as one containing enzymes or chelating agents) to reduce the corrosiveness to the membrane surface.

[0093] Specifically, this step is applicable to situations where reverse osmosis membranes experience performance degradation and cleaning effects that fail to meet expectations after long-term operation, and it has wide application value, especially in industrial water treatment, seawater desalination, and municipal water supply systems. This optimization mechanism can effectively improve cleaning efficiency, extend the service life of membrane elements, and reduce system energy consumption and maintenance costs caused by improper cleaning.

[0094] Furthermore, the technical effect of this step is that it drives the precise adjustment of cleaning parameters through quantitative evaluation results, realizing the transformation from experience-based judgment to data-driven approach, improving the scientific nature and repeatability of the cleaning process, and providing key support for the intelligent operation and maintenance of reverse osmosis systems.

[0095] This invention discloses a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes. By constructing a multi-dimensional quantitative index system covering permeate flow recovery, pressure drop, and desalination stability, and introducing weighted comprehensive scoring and effect level determination rules, it effectively solves the technical shortcomings of traditional methods that rely on single indicators, offer biased judgments, and lack quantitative basis. This method achieves systematization and objectification of the entire process from key parameter collection, standardized processing, index calculation to comprehensive evaluation, transforming the assessment of cleaning effect from experience-based judgment to data-driven scientific decision-making. Based on the scoring results, it forms a closed-loop management system of assessment-determination-optimization, significantly improving the scientific rigor, economy, and operability of the cleaning process and its operation and maintenance.

[0096] Example 2 To achieve the above invention, embodiments of the present invention also provide another multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, such as... Figure 2 As shown, it includes: S101, First step data acquisition and preprocessing: After completing the chemical cleaning process and ensuring the system returns to stable operation, key operating parameters of the reverse osmosis system are collected, including but not limited to: permeate flow rate, operating pressure, water temperature, conductivity, etc., and the standardized permeate flow rate, inter-stage pressure difference and desalination rate before and after cleaning are calculated accordingly.

[0097] S102, Step Two: Calculation of Core Indicators: A comprehensive evaluation is conducted by calculating the following four key indicators: Standardized permeate flow recovery rate R1 = (Standardized permeate flow after cleaning / Initial standardized permeate flow) × 100%, with a target value of ≥80%, used to assess the degree of permeate flow recovery relative to the new membrane condition; Permeate flow improvement rate R2 = (Permeate flow after cleaning - Permeate flow before cleaning) / Permeate flow before cleaning × 100%, with a target value of ≥20%, used to assess the effect of this cleaning on the instantaneous permeate flow capacity improvement; Inter-stage pressure difference reduction rate R3 = (Inter-stage pressure difference before cleaning - Inter-stage pressure difference after cleaning) / Inter-stage pressure difference before cleaning × 100%, with a target value of ≥30%, used to assess the effect of removing fouling in the flow channels; Desalination rate change R4 = (Desalination rate after cleaning - Desalination rate before cleaning), requiring a stable or slightly improved desalination rate with operational fluctuations within ±0.5%, used to assess the recovery and stability of the membrane element's selective separation function.

[0098] S103, Third Step: Weighted Scoring and Individual Score Calculation: To arrive at a single, clear conclusion, this invention uses a weighted scoring method to calculate the overall performance recovery score (S), with a maximum score of 100. The weight allocation and specific scoring rules for each indicator are as follows: Standardized permeable water production recovery rate R1: Weight 40%. Score calculation: Full marks of 40 points when R1 ≥ 90%; when 80% ≤ R1 < 90%, score = 30 + (R1 - 80%) / (90% - 80%) × 10; when R1 < 80%, score = (R1 / 80%) × 30; Permeable water production increase rate R2: Weight 20%. Score calculation: Full marks of 20 points when R2 ≥ 30%; when 20% ≤ R2 < 30%, score = 15 + (R2 - 20%) / (30% - 20%) × 5; when R2 < 20%, score = (R2 / 20%) × 15; Inter-stage pressure difference reduction rate R3: Weight 30%. Scoring Calculation: A perfect score of 30 points is awarded when R3 ≥ 40%; when 30% ≤ R3 < 40%, the score is 20 + (R3 - 30%) / (40% - 30%) × 10; when R3 < 30%, the score is (R3 / 30%) × 20; Desalination rate stability R4: weight 10%. Scoring Calculation: If the desalination rate is stable or increases (change value ≥ 0%), and the fluctuation is within ±0.5%, 10 points are awarded; if the desalination rate decreases but the decrease is less than 0.5% (i.e., -0.5% < change value < 0%), 5 points are awarded; if the desalination rate decreases more than 0.5% (change value ≤ -0.5%), 0 points are awarded.

[0099] S104, Step 4: Comprehensive Evaluation and Grading: Sum the scores of each item to obtain the overall performance recovery score S. The final evaluation grade is determined based on the total score S: Excellent: 90 ≤ S ≤ 100; Good: 80 ≤ S < 90; Average: 70 ≤ S < 80; Poor: 60 ≤ S < 70; Cleaning Failure: S < 60.

[0100] This invention presents another multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes. By constructing a multi-dimensional quantitative index system integrating permeate flow recovery, differential pressure reduction, and desalination stability, and introducing a weighted comprehensive scoring and effect level determination mechanism, it effectively overcomes the technical limitations of traditional methods that rely on single indicators, offer biased evaluations, and lack scientific quantitative basis. It achieves a systematic and objective process throughout the entire process, from key operating parameter collection, standardized processing, core index calculation to weighted scoring and level determination. This elevates the evaluation of cleaning effect from experience-based judgment to data-driven scientific decision-making, significantly improving the accuracy, comparability, and engineering guidance value of the evaluation results, and providing a reliable basis for optimizing cleaning processes and standardizing the maintenance of reverse osmosis systems.

[0101] Example 3 To achieve the above invention, embodiments of the present invention also provide an application scenario for a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, including: The reverse osmosis membrane treatment system of a power plant, fed with municipal wastewater, experienced significant fouling after four months of operation. This manifested as a decrease in permeate flow rate from an initial 100 m³ / h to 65 m³ / h, an increase in inter-stage pressure differential from 0.30 MPa to 0.55 MPa, and a slight decrease in desalination rate from 99.5% to 99.3%. After offline chemical cleaning, the system was restarted and ran stably for 24 hours. The following operational data was recorded: Initial standardized water production capacity: 100 m³ / h; standardized water production capacity after cleaning: 92 m³ / h; water production capacity before cleaning: 65 m³ / h; water production capacity after cleaning: 88 m³ / h; inter-stage pressure difference before cleaning: 0.55 MPa; inter-stage pressure difference after cleaning: 0.37 MPa; desalination rate before cleaning: 99.3%; desalination rate after cleaning: 99.5%.

[0102] Based on the above data, calculate the following indicators and scores: Standardized permeable recovery rate R1 = (92 / 100) × 100% = 92%, score = 30 + (92% - 80%) / (90% - 80%) × 10 = 42 points; Permeable improvement rate R2 = (88 - 65) / 65 × 100% = 35.4%, full score 20 points; Inter-stage pressure difference reduction rate R3 = (0.55 - 0.37) / 0.55 × 100% = 32.7%, score = 20 + (32.7% - 30%) / (40% - 30%) × 10 = 22.7 points; Desalination stability R4 = 99.5% - 99.3% = +0.2%, full score 10 points; Overall performance recovery score: S = R1 score + R2 score + R3 score + R4 score = 40 + 20 + 30 + 10 = 92.7 points.

[0103] Furthermore, according to the standard, 92.7 points falls within the range of 90 points ≤ S ≤ 100 points, and the evaluation level of this chemical cleaning effect is "excellent".

[0104] This invention presents an application scenario of a multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, verifying the feasibility and effectiveness of the proposed method. The method systematically transforms multi-dimensional and heterogeneous operating parameters before and after cleaning into standardized indicators and performs comprehensive quantitative scoring based on preset weights, ultimately outputting an intuitive cleaning effect level. This example demonstrates that the invention successfully transforms traditional experience-based qualitative judgments into a data-driven, objective, scientific, and reproducible evaluation loop, significantly improving the accuracy, consistency, and engineering guidance value of cleaning effect assessment, and providing a reliable basis for performance maintenance and optimization decisions of reverse osmosis systems.

[0105] Example 4 To achieve the above invention, such as Figure 3 As shown, this embodiment also provides a multi-index weighted evaluation device 10 for the chemical cleaning effect of reverse osmosis membranes. The device 10 includes: The data acquisition and parameter calculation module 100 is used to collect key operating parameters of the reverse osmosis system before and after cleaning, such as permeate volume, operating pressure, water temperature and conductivity, and to calculate standardized permeate volume, inter-stage pressure difference and desalination rate based on the initial commissioning state.

[0106] The index calculation module 200 is used to calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, calculate the water production increase rate based on the difference in water production before and after cleaning, calculate the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and calculate the desalination rate stability based on the difference in desalination rate before and after cleaning.

[0107] The weight allocation and score calculation module 300 is used to calculate the individual scores of standardized water production recovery rate, water production increase rate, inter-stage pressure difference decrease rate and desalination stability based on the weight allocation rules corresponding to each indicator; among them, the standardized water production recovery rate has the highest weight, and the desalination stability is used as a veto indicator.

[0108] The comprehensive scoring and rating module 400 is used to sum the scores of each item by weight to obtain the overall performance recovery score, and to classify the cleaning effect level according to the preset scoring range to determine whether the cleaning is successful.

[0109] In one embodiment of the present invention, it further includes: a process parameter adjustment module, used to adjust the cleaning process parameters according to the overall performance recovery score S, and when S < 80 points, generate cleaning scheme optimization suggestions, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

[0110] This invention provides a multi-index weighted evaluation device for the chemical cleaning effect of reverse osmosis membranes. Through an integrated modular design, it automates and systematizes the entire process from data acquisition, index calculation, weighted scoring, to comprehensive rating. This device effectively addresses the core shortcomings of traditional evaluation methods, which rely on single indicators, are subjective and one-sided, and lack quantitative standards. By using multi-dimensional indicators for synergistic weighting and comprehensive judgment, it elevates the evaluation of cleaning effect to an objective and scientific data-driven decision-making process. This significantly enhances the accuracy and reliability of the evaluation results, providing an efficient automated tool and decision support for optimizing the cleaning process and standardizing the operation and maintenance of reverse osmosis systems.

[0111] To implement the methods of the above embodiments, the present invention also provides a computer device, such as... Figure 4 As shown, the computer device 600 includes a memory 601 and a processor 602; wherein, the processor 602 reads the executable program code stored in the memory 601 to run a program corresponding to the executable program code, so as to implement the various steps of the multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membrane described above.

[0112] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a multi-index weighted evaluation method for the chemical cleaning effect of a reverse osmosis membrane as described in the foregoing embodiments.

[0113] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A multi-index weighted evaluation method for the chemical cleaning effect of reverse osmosis membranes, characterized in that, include: S1 collects key operating parameters of the reverse osmosis system before and after cleaning, including permeate volume, operating pressure, water temperature, and conductivity, and calculates standardized permeate volume, inter-stage pressure difference, and desalination rate based on the initial commissioning state. S2, calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, calculate the water production increase rate based on the difference in water production before and after cleaning, calculate the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and calculate the desalination rate stability based on the difference in desalination rate before and after cleaning. S3. Based on the weighting rules for each indicator, calculate the individual scores for the standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination rate stability respectively; among them, the standardized permeable water recovery rate has the highest weight, and the desalination rate stability is used as a veto indicator. S4 calculates the weighted sum of the individual scores to obtain the overall performance recovery score, and classifies the cleaning effect level according to the preset scoring range to determine whether the cleaning was successful.

2. The method as described in claim 1, characterized in that, The system collects key operating parameters such as permeate flow rate, operating pressure, water temperature, and conductivity before and after cleaning of the reverse osmosis system. Based on the initial commissioning state, it calculates standardized permeate flow rate, inter-stage pressure difference, and desalination rate, including: S11. When collecting water production data before and after cleaning, water temperature, operating pressure and conductivity data are recorded simultaneously, and the water production data is standardized to eliminate the interference of operating parameter fluctuations on the evaluation results. S12, When calculating the pressure difference between sections, the absolute values ​​of the pressure difference between each section before and after cleaning are compared to ensure the quantitative accuracy of the pressure difference change.

3. The method as described in claim 1, characterized in that, The calculation of the standardized permeable water production recovery rate based on the ratio of the standardized permeable water production to the initial standardized permeable water production, the calculation of the permeable water production increase rate based on the difference in permeable water production before and after cleaning, the calculation of the inter-stage pressure difference decrease rate based on the difference in inter-stage pressure difference before and after cleaning, and the calculation of the desalination rate stability based on the difference in desalination rate before and after cleaning include: S21, When calculating the standardized permeate flow recovery rate, a formula is used and its target value is set to ≥80% to assess the degree of permeate flow recovery relative to the new membrane state: ； S22, When calculating the stability of the desalination rate, the fluctuation range of the desalination rate change after washing should be controlled within a certain range. A score of 100% is awarded when the change is within 0% and the change value is ≥0%.

4. The method as described in claim 1, characterized in that, Based on the weighting rules corresponding to each indicator, individual scores are calculated for the standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination stability, respectively. Among these, the standardized permeable water recovery rate has the highest weight, and desalination stability is used as a veto indicator, including: S31, when calculating the standardized water production recovery rate score, when Scored 40 points, when At that time, the score is calculated linearly according to the formula: ； when At that time, the score is calculated using a weighted reduction formula: ； S32, when calculating the score for the rate of decrease in inter-segment pressure difference, when 30 points, when At that time, the score is calculated linearly according to the formula. ； when At that time, the score is calculated using a weighted reduction formula: 。 5. The method as described in claim 1, characterized in that, Also includes: S5. Adjust the cleaning process parameters based on the overall performance recovery score S. When S < 80, generate optimization suggestions for the cleaning solution, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

6. A multi-index weighted evaluation device for the chemical cleaning effect of reverse osmosis membranes, characterized in that, include: The data acquisition and parameter calculation module is used to collect key operating parameters of the reverse osmosis system before and after cleaning, such as permeate volume, operating pressure, water temperature and conductivity, and to calculate standardized permeate volume, inter-stage pressure difference and desalination rate based on the initial commissioning state. The indicator calculation module is used to calculate the standardized water production recovery rate based on the ratio of the standardized water production to the initial standardized water production, the water production increase rate based on the difference in water production before and after cleaning, the inter-section pressure difference decrease rate based on the difference in inter-section pressure difference before and after cleaning, and the desalination rate stability based on the difference in desalination rate before and after cleaning. The weighting and score calculation module is used to calculate the individual scores of standardized permeable water recovery rate, permeable water increase rate, inter-stage pressure difference decrease rate, and desalination stability based on the weighting rules corresponding to each indicator. Among them, the standardized permeable water recovery rate has the highest weight, and desalination stability is used as a veto indicator. The comprehensive scoring and rating module is used to sum the scores of each item by weight to obtain the overall performance recovery score, and to classify the cleaning effect level according to the preset scoring range to determine whether the cleaning is successful.

7. The apparatus as claimed in claim 6, characterized in that, Also includes: The process parameter adjustment module is used to adjust the cleaning process parameters according to the overall performance recovery score S. When S < 80, it generates optimization suggestions for the cleaning scheme, including adjusting the cleaning agent concentration gradient, dynamically extending the cleaning time, and changing the type of cleaning agent.

8. An electronic device, comprising: processor; A memory that stores executable instructions; when the processor executes the instructions, it implements the method as described in any one of claims 1-5.

9. A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the method as claimed in any one of claims 1-5.

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