Ultraviolet transmittance real-time monitoring based ultrasonic synergistic enhanced sterilization method
Patent Information
- Application Number
- CN202611382231.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-08
- Publication Date
- 2026-10-13
AI Technical Summary
在紫外杀菌过程中，水体穿透率决定了紫外光在水中的有效作用距离与实际辐照剂量，穿透率下降会导致紫外有效剂量大幅衰减，直接降低杀菌效率；而实际水处理过程中进水水质常存在波动，穿透率的动态变化会造成杀菌效果不稳定，因此实时掌握水体紫外线穿透率变化是保障紫外杀菌系统稳定运行的重要前提
[0030]本发明通过构建紫外线穿透率-超声空化强度-紫外有效剂量的三元协同增益标定模型，以实时监测的水体紫外线穿透率为核心输入，同步联动调节超声波的频率、功率密度、脉冲占空比与紫外输出功率，实现两种物理场工作参数的动态匹配，突破现有技术参数固定、两类场调节相互独立的局限，有效解决低穿透率工况下杀菌剂量不足、高穿透率工况下能量冗余的问题，在不同穿透率的水质条件下均能维持最优能量配比，保障协同杀菌效率稳定，实现杀菌效能与运行能效的同步提升，可适配多类水质波动场景的水处理消毒需求。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of water treatment and disinfection technology, specifically to an ultrasonic-assisted enhanced sterilization method based on real-time monitoring of ultraviolet transmittance. Background Technology
[0002] Ultrasonic synergistic sterilization is a water treatment disinfection technology that combines the physical effects of ultrasound with the effects of ultraviolet (UV) irradiation. It utilizes the cavitation and mechanical shearing effects of ultrasound to disrupt the cell walls and membranes of microorganisms, increasing their sensitivity to UV irradiation. This, combined with the damaging effects of UV light on microbial nucleic acids, achieves inactivation. Compared to traditional chemical disinfection methods, this technology requires no chemical additives, produces no disinfection byproducts, and exhibits good inactivation effects against drug-resistant microorganisms. It has significant application value in advanced drinking water treatment, wastewater reuse disinfection, and aquaculture water treatment, and is one of the key technological pathways for ensuring aquatic biosafety.
[0003] Ultraviolet (UV) transmittance is a core parameter measuring the ability of water to transmit UV light. Its value is directly affected by the concentration and properties of components in the water, such as suspended particulate matter, chromatic substances, and dissolved organic matter. During UV sterilization, water transmittance determines the effective range and actual irradiation dose of UV light. A decrease in transmittance leads to a significant reduction in the effective UV dose, directly decreasing sterilization efficiency. Furthermore, in actual water treatment processes, influent water quality often fluctuates, and dynamic changes in transmittance can cause unstable sterilization effects. Therefore, real-time monitoring of UV transmittance changes is a crucial prerequisite for ensuring the stable operation of the UV sterilization system.
[0004] However, existing ultrasound-assisted ultraviolet sterilization technologies mostly adopt a fixed-parameter operation mode, which cannot synchronously adjust the working parameters of ultrasound and ultraviolet according to the real-time changes in ultraviolet transmittance of water. This easily leads to energy redundancy under high transmittance conditions and insufficient sterilization dosage under low transmittance conditions. At the same time, the parameter adjustments of the two physical fields are independent of each other, and no linkage matching relationship has been established between transmittance, ultrasound cavitation intensity, and effective ultraviolet dosage. It is difficult to maintain stable synergistic sterilization efficiency under fluctuating water quality conditions, and the operating energy consumption cannot be dynamically optimized according to water quality conditions. Therefore, it is of great significance to develop an ultrasound-assisted enhanced sterilization method based on real-time monitoring of ultraviolet transmittance. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance. It can achieve dynamic optimization of synergistic sterilization efficiency under different water quality conditions by constructing a ternary synergistic gain calibration model and adjusting ultrasonic and ultraviolet parameters in conjunction with real-time transmittance.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an ultrasonic-assisted enhanced sterilization method based on real-time monitoring of ultraviolet transmittance. This method is implemented using a sterilization system, which includes a sterilization chamber, a system control unit, an ultrasonic generator unit, and an ultraviolet irradiation unit. The method includes the following steps:
[0007] S1. Pre-construct a ternary synergistic gain calibration model, establish the parameter mapping relationship between ultraviolet transmittance, ultrasonic cavitation intensity, and effective ultraviolet dose, and store it to form a calibration parameter library;
[0008] S2. Collect ultraviolet transmittance data of the water body to be treated in real time, input the real-time transmittance value into the ternary synergistic gain calibration model, and match the ultrasonic working parameters and ultraviolet output parameters corresponding to the current working condition.
[0009] S3. Synchronously adjust the operating status of the ultrasonic generator unit and the ultraviolet irradiation unit according to the parameters obtained by matching, and carry out synergistic sterilization treatment on the water to be treated.
[0010] S4. Continuously collect ultraviolet transmittance data of the water body. When the transmittance fluctuation exceeds the adaptation range corresponding to the current operating parameters, rematch the parameters and synchronously adjust the operating parameters of the ultrasonic generator unit and the ultraviolet irradiation unit.
[0011] Furthermore, step S1, in constructing the ternary synergistic gain calibration model, includes the following steps:
[0012] By adjusting the concentrations of suspended particulate matter and dissolved organic matter in the water, multiple water samples with different ultraviolet transmittance were prepared, and multiple gradient combinations of ultrasonic parameters and ultraviolet output parameters were set at fixed step sizes.
[0013] Synergistic sterilization and inactivation tests were carried out in groups under each penetration rate gradient to determine the microbial inactivation rate in the water and collect the corresponding parameter combinations that meet the target sterilization and inactivation rate.
[0014] The optimal energy ratio coefficient corresponding to each penetration rate is calculated based on the collected parameter combinations. The calculation formula is as follows: ,in For the corresponding penetration rate The optimal energy ratio coefficient under the following conditions The optimal ultrasonic energy density that satisfies the target inactivation rate at this penetration level. To correspond to the optimal ultraviolet energy density, the energy density is the energy input per unit volume of water, expressed in J / L, based on various gradients. Numerical values are used to establish continuous parameter mapping relationships, which are then stored in the calibration parameter library. The value was obtained by calibrating the average value of multiple parallel inactivation tests.
[0015] Furthermore, step S3, when performing synergistic sterilization treatment, includes the following steps:
[0016] The ultrasonic generator unit outputs ultrasonic waves of set frequency and power according to the matching parameters, which act on the water to be treated in the sterilization chamber.
[0017] The ultraviolet irradiation unit outputs ultraviolet light of a set intensity according to the matching parameters, and synchronously irradiates the water to be treated in the sterilization chamber;
[0018] The water to be treated flows axially along the sterilization chamber, passing through the area where ultrasound and ultraviolet light overlap. The equivalent sterilization dose received by the water is calculated using the formula: Calculation, where This is the equivalent bactericidal dose. This is the actual ultraviolet radiation dose. This represents the ultrasonic enhancement factor. The intensity of ultrasonic cavitation. The synergistic effect of ultraviolet sterilization under different cavitation intensities was determined through a control experiment, and the corresponding coefficient values were obtained by fitting. The percentage increase in UV dose per unit cavitation intensity, its dimensions are... The dimensions of the two quantities are reciprocals of each other, to ensure that It is a dimensionless number.
[0019] Furthermore, step S2, when matching operating parameters, includes the following steps:
[0020] The real-time acquired raw penetration rate data is subjected to moving average filtering to remove abnormal fluctuation values and extract stable effective penetration rate values.
[0021] Input the effective value of penetration into the three-element synergistic gain calibration model, and call the calibration parameter library to perform linear interpolation matching operation;
[0022] The complete set of ultrasound working parameters and ultraviolet output power parameters obtained from the output matching are sent to the corresponding execution unit.
[0023] Furthermore, in step S1, the ultrasonic cavitation intensity is controlled by adjusting three parameters: ultrasonic frequency, power density, and pulse duty cycle. The formula for calculating the ultrasonic cavitation intensity is: ,in The intensity of ultrasonic cavitation. For ultrasonic power density, The pulse duty cycle. For ultrasonic frequency, The cavitation efficiency coefficient is... For the frequency-affected index, and Through preliminary experimental fitting and calibration, cavitation intensity was measured under different parameter combinations for the target water medium. The corresponding coefficient values were obtained through fitting. Within the experimental range, cavitation intensity showed an approximately linear positive correlation with power density and duty cycle, but a non-linear negative correlation with frequency. Therefore, [the following method was adopted]. The frequency effect is described in the form of [the method], and the effective ultraviolet dose is controlled by adjusting the output power of the ultraviolet light source. The calibration parameter library is divided into storage units according to the range of transmittance values.
[0024] Furthermore, in step S2, the ultraviolet transmittance data is collected by a transmittance detection unit located at the water inlet of the sterilization chamber. The collection frequency is matched with the hydraulic residence time of the water in the sterilization chamber. The amount of data collected in a single instance covers the complete water flow fluctuation cycle. The collected transmittance data is sent to the system control unit via wired transmission, and the system control unit performs subsequent parameter matching calculations.
[0025] Furthermore, in step S3, the ultrasonic generating unit is connected to the ultrasonic transducer array arranged on the side wall of the sterilization chamber. The ultrasonic transducer array is evenly arranged along the water flow direction of the sterilization chamber, and the emitting surface of each transducer unit faces the center of the chamber. All transducer units are controlled by the same driving signal to synchronously output ultrasonic waves, forming a continuous ultrasonic field in the sterilization chamber.
[0026] Furthermore, in step S3, the ultraviolet irradiation unit includes an ultraviolet lamp assembly disposed inside the sterilization chamber. The ultraviolet lamp assembly is centrally arranged along the axial direction of the sterilization chamber. A transparent quartz sleeve is fitted over the outer side of the ultraviolet lamp assembly. The axis of the transparent sleeve coincides with the axis of the sterilization chamber. Both ends of the sleeve are sealed to the end walls of the sterilization chamber, thus isolating the ultraviolet lamps from the water.
[0027] Furthermore, in step S4, the adaptation range corresponding to the current operating parameters is pre-stored in the calibration parameter library. The adaptation range corresponds to the range of penetration rate fluctuations that a single set of parameters can cover. The upper and lower limits of the range are determined by the penetration rate boundary value corresponding to the inactivation rate meeting the standard under that set of parameters. When the penetration rate exceeds the adaptation range for multiple consecutive collection cycles, the parameter rematching process is triggered.
[0028] Furthermore, in step S4, the parameter adjustment actions of the ultrasonic generating unit and the ultraviolet irradiation unit are performed synchronously. The parameter adjustment process adopts a smooth transition method to change the output value step by step, with a fixed time interval between each adjustment. During the parameter adjustment process, the water inlet flow rate and water flow velocity of the sterilization chamber are kept stable. After the parameter adjustment is completed, sterilization treatment is continuously performed according to the new operating parameters.
[0029] Compared with existing technologies, this ultrasonic-assisted sterilization method based on real-time monitoring of ultraviolet transmittance has the following beneficial effects:
[0030] This invention constructs a ternary synergistic gain calibration model based on ultraviolet transmittance, ultrasonic cavitation intensity, and effective ultraviolet dose. Using real-time monitored ultraviolet transmittance of the water body as the core input, it synchronously adjusts the frequency, power density, pulse duty cycle, and ultraviolet output power of the ultrasonic waves. This achieves dynamic matching of the two physical field operating parameters, overcoming the limitations of existing technologies where parameters are fixed and the two types of field adjustments are independent. It effectively solves the problems of insufficient bactericidal dose under low transmittance conditions and energy redundancy under high transmittance conditions. It maintains the optimal energy ratio under water quality conditions with varying transmittance, ensuring stable synergistic bactericidal efficiency and achieving simultaneous improvement in bactericidal efficacy and operational energy efficiency. It is adaptable to water treatment and disinfection needs in various water quality fluctuation scenarios.
[0031] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0033] Figure 1 The flowchart shows a method for ultrasonic-assisted sterilization based on real-time monitoring of ultraviolet transmittance.
[0034] Figure 2 This is a flowchart illustrating the steps of an ultrasound-assisted sterilization method based on real-time monitoring of ultraviolet transmittance.
[0035] Figure 3 This is a flowchart of the process of constructing a ternary synergistic gain calibration model. Detailed Implementation
[0036] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.
[0037] The present invention provides an ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet (UV) transmittance. This method relies on a sterilization system comprising a sterilization chamber, a system control unit, an ultrasonic generation unit, and a UV irradiation unit. A pre-constructed ternary synergistic gain calibration model establishes a parameter mapping relationship between UV transmittance, ultrasonic cavitation intensity, and effective UV dose. Real-time collected UV transmittance data from the water body is used as the core input to match corresponding operating parameters, synchronously controlling the ultrasonic and UV output states. Operating parameters are dynamically adjusted based on transmittance fluctuations, achieving simultaneous optimization of synergistic sterilization efficacy and operational efficiency under different water quality conditions. A detailed description is provided below with reference to specific embodiments and accompanying drawings.
[0038] This embodiment is applied to a municipal drinking water advanced treatment scenario, with a designed treatment capacity of 50m³. 3 The overall treatment process follows a filtration-then-disinfection route. This sterilization method is implemented after the activated carbon filtration process as a final-stage disinfection to ensure the biological safety of the effluent. The sterilization system used in this embodiment is primarily a cylindrical cavity structure, 3m in length and 0.8m in inner diameter. The cavity has an inlet and an outlet at both ends, both connected to the upstream process piping via flanges. Figure 2 As shown, the sterilization chamber is equipped with a transmittance detection unit, an ultrasonic transducer array, a UV lamp assembly, and a transparent sleeve. Externally, it houses a system control unit, an ultrasonic drive module, and a UV drive module. The transmittance detection unit is located inside the pipe at the water inlet of the chamber, with the detection window facing the water flow direction, for real-time acquisition of UV transmittance data of the incoming water. The ultrasonic transducer array is arranged on the outer sidewall of the sterilization chamber, evenly distributed along the water flow direction. All transducer units are connected to the ultrasonic drive module via signal lines. The UV lamp assembly is centrally located along the axial direction of the sterilization chamber, with both ends of the lamps fixed to end caps on both sides of the chamber. A transparent sleeve is fitted over the lamps, sealing both ends of the sleeve with the end caps to completely isolate the lamps from the water inside the chamber. The system control unit is electrically connected to the transmittance detection unit, the ultrasonic drive module, and the UV drive module, respectively, for performing data processing, parameter matching, and operational control functions.
[0039] like Figure 3 As shown, before the system is officially put into operation, the construction of the ternary synergistic gain calibration model is completed first. The calibration process is carried out in the experimental environment, using test water with the same composition as the actual treated water.
[0040] The first step is to prepare water samples with different transmittances. By adding standard kaolin and humic acid standard substances to pure water, the concentrations of suspended particulate matter and dissolved organic matter in the water are adjusted to obtain multiple sets of test water samples with gradient changes. The transmittance of each set of samples is measured using a 254nm wavelength ultraviolet spectrophotometer to obtain a transmittance gradient sequence covering the fluctuation range of actual working conditions.
[0041] The second step involves setting up the experimental parameter combination. For the ultrasonic output parameters, gradients are set for frequency, power density, and pulse duty cycle in fixed steps. The frequency range covers 20kHz to 100kHz, and the power density ranges from 0.1W / cm². 2 Up to 1.0W / cm 2 The pulse duty cycle ranges from 10% to 100%; for UV output parameters, the output power is set in a gradient with a fixed power step size, ranging from 10W to 100W.
[0042] The third step involved a synergistic sterilization and inactivation experiment. Using *E. coli* as an indicator microorganism, the indicator microorganism was inoculated into each group of water samples, ensuring the initial microbial concentration was at the same level. Different combinations of ultrasonic and ultraviolet parameters were then used for treatment. After treatment, the concentration of surviving microorganisms in the water was determined using the plate count method, and the corresponding inactivation rate was calculated. Each parameter combination was tested in triplicate, and the average inactivation rate was taken as the final result.
[0043] In the specific implementation of this embodiment, based on the collected experimental data, all parameter combinations that meet the target sterilization and inactivation rate under each penetration rate gradient are screened. The combination with the lowest total input energy is selected as the optimal parameter combination. The optimal energy ratio coefficient corresponding to each penetration rate is calculated using the following formula: In the formula For the corresponding penetration rate The optimal energy ratio coefficient under the following conditions The optimal ultrasonic energy density that satisfies the target inactivation rate at this penetration level. This corresponds to the optimal ultraviolet energy density. The value was obtained by calibrating the average of multiple sets of parallel inactivation tests. At least 5 sets of parallel calibration tests were carried out under each penetration rate gradient. After removing outlier data with excessive deviation, the arithmetic mean was taken to obtain the standard value at the corresponding penetration rate. Numerical values. Based on each gradient. Numerical values were obtained by using a polynomial fitting method to establish a continuous parameter mapping relationship between transmittance and the optimal energy ratio coefficient. Simultaneously, the corresponding optimal ultrasonic and ultraviolet parameters were stored together to form a complete calibration parameter library. The calibration parameter library is divided into storage units according to the transmittance value range, with each storage unit corresponding to a set of optimal parameter combinations. All parameter combinations cover the complete transmittance range, meeting the parameter matching requirements for all water quality conditions under actual working conditions.
[0044] When the system is in full operation, such as Figure 1As shown, the transmittance detection unit is first activated to collect real-time ultraviolet transmittance data of the incoming water. The transmittance detection unit uses an online ultraviolet transmittance sensor with a detection wavelength of 254nm and a sampling frequency of 1 time / second. The sensor's detection window is automatically cleaned periodically to prevent surface contaminants from affecting detection accuracy. The collected raw transmittance data is transmitted to the system control unit via RS485 wired transmission, where the system control unit performs subsequent data processing and parameter matching calculations.
[0045] In the specific implementation of this embodiment, the system control unit first performs moving average filtering and noise reduction on the real-time acquired raw penetration data. A 5-second sliding window is used, and the arithmetic mean of all data points within the window is calculated. Abnormal fluctuations exceeding a set threshold are removed to extract a stable effective penetration value. After data processing, the effective penetration value is input into the ternary synergistic gain calibration model, and linear interpolation matching is performed using the calibration parameter library. When the effective penetration value corresponds exactly to a gradient point in the calibration parameter library, the optimal parameter combination corresponding to that point is directly retrieved. When the effective penetration value lies between two adjacent calibration gradients, linear interpolation is performed based on the parameter values of the two gradient points, weighted by the distance of the penetration rate, to obtain the optimal parameter value corresponding to the current penetration rate. After matching, the system control unit outputs a complete set of ultrasound operating parameters and ultraviolet output power parameters, which are then sent to the ultrasound drive module and the ultraviolet drive module, respectively.
[0046] In the specific implementation process of this embodiment, after the parameter matching is completed, the matching result is verified using the equivalent bactericidal dosage formula to ensure that the output parameters meet the bactericidal requirements. The calculation formula is as follows: In the formula This is the equivalent bactericidal dose. β represents the actual ultraviolet radiation dose, and β is the ultrasound enhancement factor. The intensity of ultrasonic cavitation. Calibration was achieved through a control experiment. A blank ultraviolet control group and an ultrasonic synergistic experimental group were set up during the experiment to maintain a consistent ultraviolet irradiation dose. The synergistic effect of ultraviolet sterilization under different cavitation intensities was measured, and the corresponding coefficient values were obtained by fitting multiple sets of experimental data. In this embodiment, the water quality characteristics of drinking water treatment were considered. The calibration value is 0.0035m. 2 / W, this value was determined by averaging 10 sets of control experiments. To ensure dimensional consistency, this embodiment converts all input parameters to the International System of Units (SI) for fitting during the calculation process, and the calibrated values are then used. The values already include the unit conversion factors mentioned above. During the verification process, the calculated equivalent bactericidal dose must be greater than or equal to the target bactericidal dose. If this is not met, a higher-level parameter combination will be re-matched until the bactericidal requirements are met.
[0047] After the parameters are issued, the ultrasonic drive module and the ultraviolet drive module start synchronously, driving the ultrasonic transducer array and the ultraviolet lamp group to operate according to the matched parameters, respectively, to carry out synergistic sterilization treatment on the water to be treated. The ultrasonic generating unit is connected to the ultrasonic transducer array arranged on the side wall of the sterilization chamber. In this embodiment, a total of 8 transducer units are set, evenly arranged along the water flow direction of the sterilization chamber. Each group contains 4 transducers, evenly distributed around the circumference of the side wall of the chamber. The emitting surface of each transducer unit faces the center of the chamber. All transducer units are controlled by the same drive signal to synchronously output ultrasonic waves, forming a continuous and uniform ultrasonic field in the sterilization chamber.
[0048] In the specific implementation of this embodiment, the ultrasonic cavitation intensity is controlled by adjusting three parameters: ultrasonic frequency, power density, and pulse duty cycle. The calculation formula is as follows: In the formula The intensity of ultrasonic cavitation. For ultrasonic power density, The pulse duty cycle. For ultrasonic frequency, The cavitation efficiency coefficient is... This is the frequency influence index. and Through preliminary experimental fitting and calibration, the cavitation intensity under different parameter combinations was determined using the hydrophone method. The calibrated hydrophone was placed at the center of the sterilization chamber, and different combinations of ultrasonic parameters were input sequentially. Corresponding cavitation noise sound pressure data were collected and converted to obtain the corresponding cavitation intensity. The cavitation intensity was then obtained by fitting multiple sets of experimental data. and The value of is determined in this embodiment, which is for drinking water media. The calibration value is 0.85. The calibration value is 0.6. Both coefficients were determined by fitting experimental data with 20 different parameters. The fitting correlation coefficient is higher than 0.95, indicating high calculation accuracy.
[0049] The ultraviolet irradiation unit includes an array of ultraviolet lamps housed inside the sterilization chamber. In this embodiment, six low-pressure ultraviolet mercury lamps are used, each with a rated power of 25W and an output wavelength of 254nm. All lamps are centrally arranged along the axial direction of the sterilization chamber, and a transparent quartz sleeve is fitted over each lamp. The axis of the transparent sleeve coincides with the axis of the sterilization chamber, and both ends of the sleeve are sealed to the end walls of the sterilization chamber, isolating the ultraviolet lamps from the water. This ensures both the transmission efficiency of ultraviolet light and prevents water from contacting the lamps and damaging the electrodes. The water to be treated enters the sterilization chamber from the inlet and flows along the axial direction of the chamber, sequentially passing through the ultrasonic action area and the ultraviolet irradiation area. Synergistic sterilization is completed in the overlapping area of the two physical fields, and the water finally flows out from the outlet. In this embodiment, the internal flow velocity of the chamber is designed to be 0.5m / s, and the hydraulic residence time is 30s to ensure that the water receives a sufficient equivalent sterilization dose.
[0050] During sterilization operation, the penetration rate detection unit continuously collects ultraviolet penetration rate data of the incoming water. The system control unit determines in real time whether the penetration rate is within the suitable range corresponding to the current operating parameters. The suitable range corresponding to the current operating parameters is pre-stored in the calibration parameter library. The suitable range corresponds to the penetration rate fluctuation range that a single parameter combination can cover. The upper and lower limits of the range are determined by the penetration rate boundary value corresponding to the inactivation rate target under that parameter set. When the penetration rate is higher than the upper limit of the range, the sterilization dosage of the current parameters is redundant, resulting in energy waste; when the penetration rate is lower than the lower limit of the range, the sterilization dosage of the current parameters is insufficient, and the biological safety of the effluent cannot be guaranteed.
[0051] In the specific implementation of this embodiment, to avoid false triggering caused by instantaneous fluctuations in water quality, the parameter rematch process is only triggered when the penetration rate exceeds the adaptation range for three consecutive sampling cycles. After triggering rematch, the system control unit re-calls the ternary synergistic gain calibration model, matches the new optimal operating parameters based on the current effective value of the penetration rate, and then controls the ultrasonic drive module and the ultraviolet drive module to synchronously perform parameter adjustments. The parameter adjustment process adopts a smooth transition method, changing the output value in five levels, with a 2-second interval between each level, to avoid sudden changes in output power impacting the equipment and to prevent large fluctuations in the sterilization effect. During the parameter adjustment process, the inlet water flow rate and water velocity of the sterilization chamber are maintained stable through the flow regulating valve at the inlet end, ensuring that the hydraulic residence time remains constant and preventing flow rate changes from affecting the sterilization effect. After the parameter adjustment is completed, the system continues to perform sterilization treatment according to the new operating parameters, while continuing to monitor the penetration rate changes in real time, forming a complete closed-loop control process.
[0052] During system operation, the system control unit automatically records all operational data, including real-time penetration rate, ultrasonic operating parameters, ultraviolet operating parameters, and calculated equivalent bactericidal dose. The data storage cycle is once per minute, and the stored data can be used for subsequent model optimization and system maintenance. When the system needs to be shut down, first turn off the ultraviolet drive module and the ultrasonic drive module. After the lamps and transducers stop working, close the water inlet valve to complete the shutdown operation.
[0053] In summary, this embodiment constructs a ternary synergistic gain calibration model to establish a quantitative mapping relationship between ultraviolet transmittance and dual-field parameters. With real-time transmittance monitoring as the core, it achieves synchronous dynamic adjustment of ultrasonic and ultraviolet parameters. This allows for real-time matching of optimal operating parameters to fluctuations in influent water quality, maintaining a stable synergistic sterilization effect under different transmittance conditions. Simultaneously, it optimizes energy ratios to reduce system energy consumption. The entire method forms a complete closed-loop control logic, the parameter calibration method is repeatable, and the hardware configuration is adaptable to conventional water treatment conditions. It can be widely applied to various drinking water treatment, wastewater reuse and disinfection scenarios, demonstrating good application value and promising prospects for promotion.
[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A method for ultrasonic-assisted sterilization based on real-time monitoring of ultraviolet transmittance, characterized in that, This method is implemented based on a sterilization system, which includes a sterilization chamber, a system control unit, an ultrasonic generator unit, and an ultraviolet irradiation unit. The method includes the following steps: S1. Pre-construct a ternary synergistic gain calibration model, establish the parameter mapping relationship between ultraviolet transmittance, ultrasonic cavitation intensity, and effective ultraviolet dose, and store it to form a calibration parameter library; S2. Collect ultraviolet transmittance data of the water body to be treated in real time, input the real-time transmittance value into the three-element synergistic gain calibration model, and match the ultrasonic working parameters and ultraviolet output parameters corresponding to the current working condition. S3. Synchronously adjust the operating status of the ultrasonic generator unit and the ultraviolet irradiation unit according to the parameters obtained by matching, and carry out synergistic sterilization treatment on the water to be treated. S4. Continuously collect ultraviolet transmittance data of the water body. When the transmittance fluctuation exceeds the adaptation range corresponding to the current operating parameters, rematch the parameters and synchronously adjust the operating parameters of the ultrasonic generator unit and the ultraviolet irradiation unit.
2. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, Step S1, when constructing the ternary synergistic gain calibration model, includes the following steps: By adjusting the concentrations of suspended particulate matter and dissolved organic matter in the water, multiple water samples with different ultraviolet transmittance were prepared, and multiple gradient combinations of ultrasonic parameters and ultraviolet output parameters were set at fixed step sizes. Synergistic sterilization and inactivation tests were carried out in groups under each penetration rate gradient to determine the microbial inactivation rate in the water and collect the corresponding parameter combinations that meet the target sterilization and inactivation rate. The optimal energy ratio coefficient corresponding to each penetration rate is calculated based on the collected parameter combinations. The calculation formula is as follows: ,in For the corresponding penetration rate The optimal energy ratio coefficient under the following conditions The optimal ultrasonic energy density that satisfies the target inactivation rate at this penetration level. To correspond to the optimal ultraviolet energy density, based on each gradient Numerical values are used to establish continuous parameter mapping relationships, which are then stored in the calibration parameter library.
3. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, Step S3, during the synergistic sterilization process, includes the following steps: The ultrasonic generator unit outputs ultrasonic waves of set frequency and power according to the matching parameters, which act on the water to be treated in the sterilization chamber. The ultraviolet irradiation unit outputs ultraviolet light of a set intensity according to the matching parameters, and synchronously irradiates the water to be treated in the sterilization chamber; The water to be treated flows axially along the sterilization chamber, passing through the area where ultrasound and ultraviolet light overlap. The equivalent sterilization dose received by the water is calculated using the formula: Calculation, where This is the equivalent bactericidal dose. This is the actual ultraviolet radiation dose. This represents the ultrasonic enhancement factor. The intensity of ultrasonic cavitation.
4. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, Step S2, when matching operating parameters, includes the following steps: The real-time acquired raw penetration rate data is subjected to moving average filtering to remove abnormal fluctuation values and extract stable effective penetration rate values. Input the effective value of penetration into the three-element synergistic gain calibration model, and call the calibration parameter library to perform linear interpolation matching operation; The complete set of ultrasound working parameters and ultraviolet output power parameters obtained from the output matching are sent to the corresponding execution unit.
5. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S1, the ultrasonic cavitation intensity is controlled by adjusting three parameters: ultrasonic frequency, power density, and pulse duty cycle. The formula for calculating the ultrasonic cavitation intensity is: ,in The intensity of ultrasonic cavitation. For ultrasonic power density, The pulse duty cycle. For ultrasonic frequency, The cavitation efficiency coefficient is... As a frequency-affected index, the effective ultraviolet dose is controlled by adjusting the output power of the ultraviolet light source, and the calibration parameter library is divided into storage units according to the range of transmittance values.
6. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S2, the ultraviolet transmittance data is collected by a transmittance detection unit installed at the water inlet of the sterilization chamber. The collection frequency is matched with the hydraulic residence time of the water in the sterilization chamber. The amount of data collected in a single session covers the complete water flow fluctuation cycle. The collected transmittance data is sent to the system control unit via wired transmission, and the system control unit performs subsequent parameter matching calculations.
7. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S3, the ultrasonic generating unit is connected to the ultrasonic transducer array arranged on the side wall of the sterilization chamber. The ultrasonic transducer array is evenly arranged along the water flow direction of the sterilization chamber, and the emitting surface of each transducer unit faces the center of the chamber. All transducer units are controlled by the same driving signal to synchronously output ultrasonic waves, forming a continuous ultrasonic field in the sterilization chamber.
8. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S3, the ultraviolet irradiation unit includes an ultraviolet lamp assembly disposed inside the sterilization chamber. The ultraviolet lamp assembly is centrally arranged along the axial direction of the sterilization chamber. A transparent quartz sleeve is fitted over the outer side of the ultraviolet lamp assembly. The axis of the transparent sleeve coincides with the axis of the sterilization chamber. Both ends of the sleeve are sealed to the end wall of the sterilization chamber, thus isolating the ultraviolet lamps from the water.
9. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S4, the adaptation range corresponding to the current operating parameters is pre-stored in the calibration parameter library. The adaptation range corresponds to the range of penetration rate fluctuations that a single set of parameters can cover. The upper and lower limits of the range are determined by the penetration rate boundary value corresponding to the inactivation rate meeting the standard under that set of parameters. When the penetration rate exceeds the adaptation range for multiple consecutive collection cycles, the parameter rematching process is triggered.
10. The ultrasonic synergistic enhanced sterilization method based on real-time monitoring of ultraviolet transmittance according to claim 1, characterized in that, In step S4, the parameter adjustment actions of the ultrasonic generating unit and the ultraviolet irradiation unit are performed synchronously. The parameter adjustment process adopts a smooth transition method to change the output value step by step. The interval between each adjustment is fixed. During the parameter adjustment process, the water inlet flow rate and water flow velocity of the sterilization chamber are kept stable. After the parameter adjustment is completed, the sterilization treatment is continued according to the new operating parameters.