Ozone sterilization control system and sterilizer

Abstract

The application provides an ozone disinfection control system and a disinfection machine, relates to a general method or device of material or disinfection, and particularly relates to the technical field of ozone disinfection, sterilization or deodorization. The ozone dissolving sensor and the oxidation-reduction potential sensor are arranged in a disinfection pipeline, the controller is configured to take the condition that the CT integral value and the oxidation-reduction potential value reach respective preset threshold values as the determination condition of disinfection completion, the complementary physical and chemical principles that the CT integral value reflects the cumulative disinfection and killing effect of the ozone concentration and the contact time and the oxidation-reduction potential value reflects the overall oxidation capacity of the water body are used, the determination mechanism of double cross verification is formed, the misjudgment caused by the single parameter affected by the water quality fluctuation can be avoided, and therefore the accuracy of the disinfection end point determination is improved.

Description

Technical Field

[0001] This invention relates to general methods or apparatus for materials or disinfection; particularly to the field of ozone disinfection, sterilization or deodorization technology, specifically an ozone disinfection control system and disinfection machine. Background Technology

[0002] In the field of clean water pipe and pipeline disinfection and sterilization, common disinfection methods include pasteurization (80-85℃ hot water), high-temperature steam disinfection (121℃ pure steam), chemical disinfection, and ozone disinfection. Among these, ozone disinfection is widely used due to its strong oxidizing power and lack of secondary chemical pollution. However, the control methods of ozone water disinfection systems currently in practical use are generally quite crude: they mostly adopt an open-loop mode with constant power ozone production and fixed timed shutdown. The determination of the disinfection endpoint lacks objective quantitative basis based on real-time ozone concentration, contact time, and water quality changes. It also cannot automatically determine the residual ozone decomposition endpoint based on the concentration change rate, making it difficult to accurately evaluate the disinfection effect. Safe discharge relies on manual experience, and the level of automation and intelligence is low.

[0003] Chinese patent application CN110759461A, published on February 7, 2020, discloses a circulating disinfection system and an ozone disinfection method. The circulating disinfection system includes a water tank, a water-vapor mixing pump, and an ultraviolet sterilizer connected by pipelines, as well as an ozone generator (including an air pump and an ozone electrolysis cell) connected to the water-vapor mixing pump via pipelines. It can be used for disinfection and sterilization of clean water pipes, water tanks, and pipelines. The ozone disinfection method described in the specification includes the following steps: adjusting the water volume; starting the water-vapor mixing pump and the ozone generator to fully mix ozone with water to obtain ozone-disinfected water, which is then delivered to the pipeline until the ozone concentration in the pipeline reaches the disinfection concentration standard, after which the ozone generator is turned off; the ozone-disinfected water circulates and disinfects in the pipeline until a preset sterilization standard is reached; the ultraviolet sterilizer is activated to decompose the ozone in the pipeline until the ozone concentration reaches a preset discharge standard, after which it is discharged. This solution uses a water-vapor mixing pump instead of a traditional jet injector, ensuring thorough mixing of ozone with water and improving the uniformity of ozone concentration in the water.

[0004] However, the aforementioned existing technologies have the following shortcomings: First, the determination of the disinfection endpoint lacks objective and quantitative basis. In the "disinfection and sterilization" steps of the aforementioned existing technologies, ozone disinfectant water is disinfected in the pipeline "until the preset sterilization standard is reached," but the instruction manual does not disclose any specific sterilization standard criteria or testing methods. In actual use, operators can only rely on fixed disinfection time or experience to judge, and cannot accurately determine whether disinfection has been truly completed. When the raw water quality fluctuates, the fixed time may not be sufficient to achieve thorough disinfection; when the water quality is good, excessively extending the disinfection time results in energy waste.

[0005] Second, the disinfection process lacks online monitoring and automatic control. In the "ozone delivery" step of the existing technology, ozone concentration is monitored by manual sampling or by installing ozone detectors in the pipeline, but the concentration monitoring results are not linked to the start and stop decisions of the control system; the switching between the "disinfection and sterilization" and "emission treatment" steps relies on manual judgment and operation, resulting in a low degree of automation.

[0006] Third, the disinfection process of the above-mentioned existing technologies only uses a single ozone concentration parameter as a reference, lacking multi-dimensional verification methods for disinfection effect, and there is a risk of misjudgment based on a single parameter.

[0007] Therefore, an ozone disinfection control system and disinfection machine are provided. Summary of the Invention

[0008] To address the problems mentioned in the background art, the present invention provides the following technical solution: an ozone disinfection control system, comprising: Dissolved ozone sensor is used to continuously collect the concentration of dissolved ozone in water to be disinfected; Oxidation-reduction potential sensor is used to continuously collect the oxidation-reduction potential in the water to be disinfected; An electric drain valve is used to control the discharge of water after disinfection. The controller is electrically connected to the dissolved ozone sensor, the oxidation-reduction potential sensor, and the electric drain valve, respectively. The controller is configured as follows: The CT integral value is calculated in real time by numerical integration and compared with the preset CT target value; the CT integral value is obtained by numerically integrating the dissolved ozone concentration with respect to time. Disinfection is considered complete when the CT integral value reaches or exceeds the CT target value, and the oxidation-reduction potential collected by the oxidation-reduction potential sensor reaches or exceeds the preset oxidation-reduction potential threshold within the disinfection contact time. Once disinfection is complete, ozone addition will automatically stop, and residual ozone will be decomposed. Once the residual ozone concentration drops to the preset emission standard, the automatic control electric drain valve opens to discharge the water.

[0009] Furthermore, it also includes a temperature sensor for collecting the water temperature of the water to be disinfected; the controller also receives the signal from the temperature sensor and corrects the CT target value according to the water temperature, wherein the CT target value is increased when the water temperature decreases and decreased when the water temperature increases.

[0010] Furthermore, it also includes a pH sensor for collecting the pH value of the water to be disinfected; the controller also receives the signal from the pH sensor and corrects the oxidation-reduction potential threshold according to the pH value, wherein the oxidation-reduction potential threshold is lowered when the pH value increases and raised when the pH value decreases.

[0011] Furthermore, the controller also incorporates an ozone degradation kinetic model; after ozone addition is stopped, the controller predicts the time required for the residual ozone concentration to drop to the preset emission standard based on the initial value of dissolved ozone concentration at the time of cessation, and outputs a safe emission time forecast to the user.

[0012] Furthermore, the ozone degradation kinetic model adopts first-order reaction kinetics, with the ozone concentration decaying exponentially, and the decay rate constant is corrected according to the water temperature.

[0013] Furthermore, the preset redox potential threshold is a set value in the range of 650mV to 750mV; the CT target value is set according to the disinfection procedure of the type of object to be disinfected, and the value range is 1.5mg·min / L to 5mg·min / L.

[0014] Furthermore, the controller is also electrically connected to the valves and ozone generator in the disinfection pipeline; the controller automatically controls the switching of valves, ozone generator and electric drain valve at each stage of the disinfection process.

[0015] A disinfection machine, including an ozone disinfection control system.

[0016] The present invention has the following beneficial effects: 1. This invention sets up a dissolved ozone sensor and an oxidation-reduction potential sensor in the disinfection pipeline, and configures the controller to use the simultaneous attainment of the CT integral value and the oxidation-reduction potential value to determine the completion of disinfection. Based on the complementary physicochemical principle that the CT integral value reflects the cumulative disinfection effect of ozone concentration and contact time, and the oxidation-reduction potential value reflects the overall oxidation capacity of the water body, a dual cross-validation determination mechanism is formed. This can avoid misjudgment caused by the influence of water quality fluctuations on a single parameter, thereby improving the accuracy of disinfection endpoint determination.

[0017] 2. This invention installs a dissolved ozone sensor, an oxidation-reduction potential sensor, a temperature sensor, and a pH sensor on a straight pipe section between the outlet of the water-vapor mixing pump and the inlet of the ultraviolet sterilizer. This allows each sensor to collect real-world water samples after ozone and water have been fully mixed and have not been decomposed by ultraviolet light. This provides representative real-time detection data and accurate input signals to the controller.

[0018] 3. This invention sets up a controller that is electrically connected to the dissolved ozone sensor, oxidation-reduction potential sensor, temperature sensor, and pH sensor, respectively, and electrically connects the controller to the valves, ozone generator, and electric drain valve in the disinfection pipeline. This allows the controller to automatically control the switching of the valves, ozone generator, and electric drain valve based on the real-time detection signals of each sensor, thereby achieving fully automatic control of the entire process from ozone addition and disinfection process monitoring to automatic drainage after disinfection, without the need for manual intervention.

[0019] 4. This invention, by setting a temperature compensation function in the controller to correct the CT target value based on real-time water temperature, ensures consistent disinfection effects under different water temperature conditions. Furthermore, by setting a pH compensation function in the controller to correct the oxidation-reduction potential threshold based on real-time pH value, it ensures electrochemical equivalence of the oxidation-reduction potential judgment criteria under different pH conditions. These two compensation functions enable the system to execute equivalent disinfection judgment criteria across a wide range of water quality conditions.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0021] Figure 1 Illustration of existing technology Figure 1 .

[0022] Figure 2 Illustration of existing technology Figure 2 .

[0023] Figure 3 This is a schematic diagram of the system of the present invention.

[0024] In the diagram: 1. Water tank; 2. Water-vapor mixing pump; 3. Ultraviolet sterilizer; 4. Ozone generator; 41. Air pump; 42. First ozone check valve; 43. First ozone manual regulating valve; 44. Ozone electrolysis cell; 45. Second ozone check valve; 46. Second ozone manual regulating valve; 47. Flow meter; 5. Transfer pump; 6. First disinfection valve; 7. Disinfection check valve; 8. Second disinfection valve; 9. Inlet valve; 10. Outlet valve; 11. Drain valve. Dissolved ozone sensor 13, oxidation-reduction potential sensor 14, controller 15, temperature sensor 17, pH sensor 18, electric drain valve 111, first disinfection solenoid valve 61, second disinfection solenoid valve 81. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1 This embodiment applies the ozone disinfection control system of the present invention to the circulating disinfection system of purified water pipeline in a pharmaceutical workshop. The system is an automated upgrade based on a circulating disinfection system disclosed in Chinese patent application CN110759461A.

[0027] refer to Figure 1 and Figure 2 The original circulating disinfection system (CN110759461A) includes the following components: water tank 1, water-vapor mixing pump 2, ultraviolet sterilizer 3, ozone generator 4, and delivery pump 5. The outlet of water-vapor mixing pump 2 is connected to the inlet of water tank 1 via a pipeline through a first manual disinfection valve 6. The outlet of water tank 1 is connected to the inlet of water-vapor mixing pump 2 via a pipeline. The outlet of water-vapor mixing pump 2 is connected to the inlet of ultraviolet sterilizer 3 via a disinfection check valve 7 and a second manual disinfection valve 8 via a pipeline. The outlet of ultraviolet sterilizer 3 is connected to the inlet of water tank 1 via a return water pipeline. Ozone generator 4 includes an air pump 41, a first ozone check valve 42, a first ozone manual regulating valve 43, an ozone electrolysis cell 44, a second ozone check valve 45, a second ozone manual regulating valve 46, and a flow meter 47, all connected sequentially via pipelines. The output end of flow meter 47 is connected to the air inlet of water-vapor mixing pump 2. The delivery pump 5 is connected to the water tank 1 and the ultraviolet sterilizer 3 through pipelines. The manual inlet valve 9 is installed between the delivery pump 5 and the water tank 1. The manual outlet valve 10 is installed between the delivery pump 5 and the ultraviolet sterilizer 3. The manual drain valve 11 is installed on the drain pipe at the bottom of the water tank 1.

[0028] The replacements and additions made in this embodiment are as follows: refer to Figure 3 The original manual first disinfection valve 6 was replaced with a first disinfection solenoid valve 61, the original manual second disinfection valve 8 was replaced with a second disinfection solenoid valve 81, and the manual drain valve 11 was replaced with an electric drain valve 111, or an electric drain valve 111 was installed in parallel on the original drain pipe. These replacements solved the technical problem that the original system's valves required manual operation and could not automatically switch disinfection processes, thus achieving automatic on / off control of the disinfection pipeline.

[0029] A dissolved ozone sensor 13, an oxidation-reduction potential sensor 14, a temperature sensor 17, and a pH sensor 18 are added to the original system. All these sensors are installed on a straight pipe section between the outlet of the water-vapor mixing pump 2 and the inlet of the ultraviolet sterilizer 3, and an online detection flow tank is installed. The installation location is chosen because this section of pipe is upstream of the ultraviolet sterilizer 3, and the water sample being measured is a real, unprocessed sample that has not yet undergone ultraviolet photocatalytic decomposition, thus avoiding interference from the decomposition of residual ozone by the ultraviolet sterilizer. Simultaneously, this section of pipe is downstream of the water-vapor mixing pump 2, ensuring thorough mixing of ozone and water, resulting in optimal water sample uniformity. The dissolved ozone concentration and oxidation-reduction potential sensor data best represent the actual disinfection status of the system. Each sensor is connected to the analog input module of the controller 15 via signal lines. These sensors address the technical problem of existing ozone disinfection systems lacking online monitoring methods and unable to obtain key parameters of the disinfection process in real time.

[0030] The controller 15 is a programmable logic controller with built-in analog input module, digital output module and human-machine interaction touch screen. The controller 15 is electrically connected to the start / stop control terminal of the ozone generator 4, the start / stop control terminal of the ultraviolet sterilizer 3, the first disinfection solenoid valve 61, the second disinfection solenoid valve 81 and the electric drain valve 111 through digital output signal lines.

[0031] The disinfection pipeline runs from the outlet of the water-vapor mixing pump 2 through the first disinfection solenoid valve 61, water tank 1, second disinfection solenoid valve 81, and disinfection check valve 7 to the inlet of the ultraviolet sterilizer 3. From the outlet of the ultraviolet sterilizer 3, it returns to the inlet of the water tank 1 via a return pipeline, forming a closed-loop circulation system through the water-vapor mixing pump 2. The dissolved ozone sensor 13, oxidation-reduction potential sensor 14, temperature sensor 17, and pH sensor 18 are all connected to this disinfection pipeline. The disinfection pipeline carries ozone-disinfected water during the disinfection process and is switched and isolated from the normal process operation pipeline through the first disinfection solenoid valve 61 and the second disinfection solenoid valve 81.

[0032] The controller 15 has preset CT target value and oxidation-reduction potential threshold, with the CT target value set at 2.0 mg·min / L and the oxidation-reduction potential threshold set at 700 mV. The parameters are set based on the following: the CT target value of 2.0 mg·min / L for disinfection of pharmaceutical purified water pipelines is based on the recommended value of the product of disinfectant concentration and contact time in the relevant specifications for ozone disinfection of water for injection and purified water in the Chinese Pharmacopoeia (2020 edition). Laboratory challenge experiments have verified that under this CT value condition, the kill logarithm of common indicator bacteria in pharmaceutical water, such as Pseudomonas aeruginosa and Staphylococcus aureus, reaches more than 4 log. The oxidation-reduction potential threshold of 700 mV was obtained through a comparative verification experiment using a standard platinum electrode under the same water quality conditions, comparing the oxidation-reduction potential value with the plate count method. When the oxidation-reduction potential value reaches 700 mV, a strong oxidizing environment is formed in the water, which can effectively destroy the cell structure of microorganisms, thus forming a complementary verification relationship with the CT integration condition. It should be noted that the specific values ​​mentioned above (CT target value 2.0 mg·min / L, redox potential threshold 700 mV) were obtained through the aforementioned experimental verification based on the specific application scenario (pharmaceutical purified water) of this embodiment. Those skilled in the art can set different specific parameter values ​​according to the actual needs of different disinfection objects, referring to the corresponding industry standards and experimental methods.

[0033] The controller (15) also has a pre-stored temperature compensation function and a pH compensation function, which correct the CT target value according to the water temperature and the redox potential threshold according to the pH value, respectively. As a preferred embodiment, the temperature compensation function is based on the Arrhenius equation, and its preferred expression is:

[0034] in: Reference temperature CT target value below, In this embodiment For the reference temperature, this embodiment uses 298K (i.e., 25℃). The activation temperature coefficient (where Ea is the activation energy in J / mol; R is the ideal gas constant, R=8.314J / (mol·K)) was obtained by fitting the Arrhenius equation through ozone sterilization kinetic experiments at different temperatures in the target water body in this embodiment. The empirical value of 5200K was used in this embodiment. T represents the real-time water temperature (in K).

[0035] The physical meaning of this compensation function is that: at low temperatures, the speed of ozone molecule movement decreases and the frequency of collisions with microbial cell walls decreases. The rate constant of ozone's lipid peroxidation reaction on microbial cell walls decreases as the temperature decreases. Therefore, a higher CT integral value is required to achieve the same sterilization effect. When the water temperature is below 20℃, this formula can adjust the CT target value upward to ensure that the disinfection effect is equivalent under low temperature conditions.

[0036] Temperature compensation experimental calibration method and raw data: above The process of obtaining the coefficient (5200K) is as follows: The killing curves of ozone on Pseudomonas aeruginosa were measured at four temperature points: 5℃, 15℃, 25℃, and 35℃. The reaction rate constant k(T) at each temperature was obtained, and the rate constants corresponding to each temperature point are shown in the table below: Then use lnk to pair Plot the graph and obtain the slope through linear regression fitting. In this embodiment, the fitting result is -5200K, and the correlation coefficient R² > 0.98. Those skilled in the art can repeat the above calibration process according to actual water quality.

[0037] Temperature Compensation Example parameter: , , Data Set 1: Water temperature 25℃ (baseline) Conclusion: At a water temperature of 25℃, no correction is required, and the target CT value remains at 2.0 mg·min / L.

[0038] Data Set 2: Water temperature 15℃ (low temperature) Conclusion: When the water temperature drops to 15℃, the target CT value is increased from 2.0 to 3.7 mg·min / L, an increase of about 85%.

[0039] Data Set 3: Water temperature 35℃ (high temperature) Conclusion: When the water temperature rises to 35℃, the target CT value is reduced from 2.0 to 1.13 mg·min / L, a reduction of approximately 43%.

[0040] The pH compensation function is based on an empirical relationship calibrated through experiments, and its preferred expression is: in: The baseline redox potential threshold is at pH=7.0. In this embodiment ; Calibration method and raw data for coefficient 20mV / pH: Under six conditions (pH=6.0, 6.5, 7.0, 7.5, 8.0, 8.5), the equilibrium potential of the redox potential sensor electrode was measured in the same oxidizing environment (with the same concentration of standard oxidant added). The measured values ​​of the ORP equilibrium potential at each pH point are shown in the table below: A graph was plotted between redox potential and pH, and the slope was obtained through linear regression. In this embodiment, the fitted slope was -20 mV / pH, and the correlation coefficient R² > 0.97. This formula has been experimentally verified to be effective within the pH range of 6.0-8.5. Recalibration is required for values ​​outside this range.

[0041] pH refers to the real-time pH value.

[0042] The physical meaning of this pH compensation function is that when the pH value of the water increases, the equilibrium potential of the redox potential sensor electrode shifts negatively. The redox potential sensor reading corresponding to the same actual oxidation capacity will be lower under alkaline conditions. Therefore, the redox potential threshold needs to be corrected according to the pH value so that the redox potential sensor judgment criteria under different pH conditions have electrochemical equivalence.

[0043] It should be understood that the coefficients in the above compensation function ( The pH coefficient (20mV / pH) was obtained through experimental calibration based on the water quality and sensor characteristics of this embodiment. This coefficient may vary under different water quality conditions, and those skilled in the art can calibrate and adjust it through simple experiments.

[0044] pH compensation example parameter: Data set 1: pH=7.0 (neutral, baseline) Conclusion: At pH 7.0, no correction is required, and the redox potential threshold remains at 700 mV.

[0045] Data set 2: pH=8.5 (slightly alkaline) Conclusion: When the pH is raised to 8.5, the redox potential threshold is reduced from 700 mV to 670 mV, a reduction of 30 mV.

[0046] Data set 3: pH=6.0 (slightly acidic) Conclusion: When the pH drops to 6.0, the redox potential threshold increases from 700 to 720 mV, an increase of 20 mV.

[0047] The working process of this ozone disinfection control system is as follows: Preparation phase: The controller 15 accepts the operator's selection of the disinfection mode through the human-machine interface, automatically loads the CT target value and oxidation-reduction potential threshold in response to the selection, and controls the first disinfection solenoid valve 61 and the second disinfection solenoid valve 81 to open, and controls the inlet valve 9 and the outlet valve 10 to close, so that the system enters the disinfection cycle loop, realizing the automatic switching between disinfection and normal process operation pipelines.

[0048] Ozone dosing stage: Controller 15 controls the ozone generator 4 and water vapor mixing pump 2 to start. Ozone gas is mixed with water by water vapor mixing pump 2 to form ozone disinfection water and injected into the disinfection pipeline for circulation. Controller 15 collects dissolved ozone concentration C(t), oxidation-reduction potential value E(t), water temperature T(t) and pH value at a set frequency.

[0049] The collected dissolved ozone concentration C(t) is used for real-time calculation of subsequent CT integral values; The collected water temperature T(t) is used to correct the CT target value in real time according to the above temperature compensation function; The collected pH values ​​are used to correct the redox potential threshold in real time according to the pH compensation formula mentioned above; The collected redox potential value E(t) is used for subsequent comparison and determination with the compensated redox potential threshold.

[0050] Circulation disinfection and judgment stage: The controller 15 calls the temperature compensation formula and pH compensation formula respectively based on the collected real-time water temperature T(t) and pH value to calculate the CT target value after temperature compensation and the redox potential threshold after pH compensation.

[0051] During the cyclic disinfection and judgment phase: Controller 15 calculates the CT integral value in real time using the trapezoidal rule numerical integration method. (Where C(t) is the dissolved ozone concentration at time t, dt is the time derivative, and the integration interval is from the start of disinfection to the current time.) Let Δt be the dissolved ozone concentration at the i-th sampling time, Δt be the sampling time interval, and the integration interval be from the start of disinfection to the current time. It is updated after each sampling; its historical peak value is continuously updated with the collected redox potential value E(t).

[0052] The controller (15) determines that disinfection is complete when all of the following conditions are met simultaneously: Condition A: CT integral value ≥ temperature-compensated target CT value; Condition B: From the moment of disinfection contact, the moving average value of the oxidation-reduction potential over the most recent consecutive 60 seconds is greater than or equal to the pH-compensated oxidation-reduction potential threshold. Condition C: Conditions A and B must be met for 60 seconds.

[0053] Condition B employs a 60-second moving average method, effectively avoiding misjudgments caused by instantaneous spikes in sensor data and ensuring that the judgment is based on a stable and reliable redox state. Conditions A and B are cross-validated based on different physicochemical principles, and Condition C ensures the stability of the judgment results. Together, these three elements constitute anti-interference redundancy, solving the technical problem of misjudgments caused by single parameters being easily affected by water quality fluctuations.

[0054] Among them, the disinfection contact time refers to the time period during the entire disinfection process from the start of ozone addition to the completion of disinfection determination. Condition B requires that the reading of the oxidation-reduction potential sensor 14 continuously meets the condition during this time period.

[0055] Residual ozone decomposition and emission stage: In response to the disinfection completion determination, controller 15 controls ozone generator 4 to stop operating and controls ultraviolet sterilizer 3 to start, decomposing the residual ozone in the pipeline. The wavelength of ozone decomposition by ultraviolet sterilizer 3 is 254nm. Ozone decomposes rapidly under ultraviolet light with a wavelength of 254nm, and the reading of dissolved ozone sensor 13 is continuously monitored. When the residual ozone concentration drops to the preset emission standard (10ppb, i.e., 0.01mg / L), controller 15 automatically controls electric drain valve 111 to open, discharging the water. This emission standard is set based on the rapid decomposition characteristics of ozone, taking into account both the reliable detection limit of the online dissolved ozone sensor and environmental safety requirements.

[0056] During the residual ozone decomposition stage, the controller 15 has a built-in ozone degradation kinetic model, which is based on first-order reaction kinetics: ozone decays in water according to an exponential law, and the decay rate constant k is obtained in the following way: after the system is installed and debugged, multiple sets of shutdown decay experiments are carried out in the target water body under different temperature conditions. By measuring the data of the residual ozone concentration changing with time, the decay rate constant k value corresponding to each temperature is fitted and pre-stored in the controller in the form of a data table.

[0057] During operation, the controller retrieves the corresponding k value from the data table based on the current water temperature, and then applies the formula... Calculate the time required for the predicted degradation to reach safe emission standards. Where: C(t) is the residual ozone concentration at time t. C0 is the initial concentration when ozone addition is stopped (i.e., the measured value at the beginning of the residual ozone decomposition and emission stage). k is the decay rate constant (related to water temperature and calibrated experimentally). t represents time. The prediction results are displayed on the touchscreen.

[0058] This predictive function solves the technical problem that operators cannot predict when residual ozone will dissipate and it is difficult to safely schedule subsequent work, effectively avoiding the health risks to personnel caused by entering the work area before the residual ozone has dissipated.

[0059] Example 2 This embodiment applies the ozone disinfection control system of the present invention to the periodic disinfection of a secondary water supply tank (50m³) in a residential building. The original system includes an ozone aeration device, a water tank, and a sewage pipe.

[0060] In this embodiment, the target CT value is set at 1.5 mg·min / L, and the redox potential threshold is set at 650 mV. The target CT value of 1.5 mg·min / L is set in accordance with the requirement in the "Standards for Drinking Water Quality" (GB5749) that the CT value for ozone disinfection should not be lower than 1.5 mg·min / L. The redox potential threshold of 650 mV was obtained through a challenge experiment conducted by inoculating the target water body (residential drinking water) in this embodiment with indicator bacteria such as Escherichia coli. Under this redox potential value, the log reduction of Escherichia coli reached more than 4 log.

[0061] A set of dissolved ozone sensors and an oxidation-reduction potential sensor are installed near the outlet at the bottom of the water tank, in the middle of the water tank, and in the dead corner at the far end of the water tank. Temperature and pH sensors are installed on the sampling pipeline at the outlet at the bottom of the water tank. This multi-point deployment solves the technical problem that poor water flow and uneven concentration distribution in large water tanks mean that single-point detection cannot represent the overall disinfection effect. The controller 15 takes the lowest value among the readings of multiple dissolved ozone sensors as the input value for CT integration calculation, ensuring overall disinfection effect with a conservative principle. Ozone is added by directly injecting ozone gas into the water tank through the aeration head, while simultaneously starting the original water supply pump to force circulation of the water in the tank until the concentration uniformity at each sampling point reaches the preset requirement (relative standard deviation of dissolved ozone concentration at each sampling point RSD ≤ 5%), after which timing and integration begin. This step solves the technical problem of insufficient local disinfection caused by uneven water mixing under aeration methods. The disinfection judgment conditions and subsequent decomposition and discharge process are the same as in Example 1.

[0062] Example 3 This embodiment provides a disinfection machine with an integrated ozone disinfection control system, including a cabinet, a controller 15 installed in the cabinet, a dissolved ozone sensor 13, an oxidation-reduction potential sensor 14, a temperature sensor 17, a pH sensor 18, a first disinfection solenoid valve 61, a second disinfection solenoid valve 81, an electric drain valve 111, and their drive modules. The disinfection machine is equipped with standard pipeline interfaces and electrical interfaces, achieving modular integration of the equipment. This solves the technical problems of large-scale construction work and complex wiring of dispersed sensor and control device installations in existing disinfection systems. It can be directly connected to the pipeline system to be disinfected, significantly reducing the workload of on-site installation and commissioning. The inlet of the disinfection machine is connected to the outlet of the water-vapor mixing pump of the pipeline system to be disinfected, the outlet is connected to the circulating return water end of the pipeline system to be disinfected, and the drain outlet is connected to the sewage pipe of the pipeline system to be disinfected. The dissolved ozone sensor 13 and the oxidation-reduction potential sensor 14 are connected to the detection pipeline of the disinfection machine through a flow tank. The controller 15 controls the external ozone generator and ultraviolet sterilizer respectively through the electrical interface. The sterilizer's panel features a touchscreen for setting target CT values ​​and oxidation-reduction potential thresholds, and displays real-time concentration curves, oxidation-reduction potential curves, and CT integral values. The sterilizer has a built-in programmable timer that allows for setting automatic sterilization plans, eliminating the need for manual intervention to start and stop the sterilization process. After sterilization, it automatically generates and stores or uploads sterilization records (including sterilization time, peak CT integral, peak oxidation-reduction potential sensor value, and residual ozone concentration in the wastewater), resolving the technical issues of untraceable sterilization processes and difficulty in meeting compliance requirements.

[0063] Example 4 This embodiment, based on embodiment 3, adds an audit trail module and electronic signature function to meet the GMP compliance requirements of the pharmaceutical industry, solving the technical problems of disinfection data being tampered with and failing to meet the integrity requirements of electronic records in Good Manufacturing Practices (GMP). The sterilizer casing is made of stainless steel, and its protection level meets the requirements of clean areas. The key parameter sensors adopt a dual-probe redundant configuration. The controller selects the lower value from the readings of the two probes and issues an alarm and suspends the disinfection process when the deviation between the two readings exceeds the allowable range (±0.2mg / L). This solves the technical problem of incorrect judgment caused by a single sensor failure or drift, resulting in disinfection failure or mis-discharge. The control circuit of the electric drain valve 111 has a hardware safety relay connected in series, independent of the controller. This relay receives the analog signal from the dissolved ozone sensor and allows the electric drain valve to open only when the concentration corresponding to the signal is lower than the preset emission standard (10ppb). This achieves hardware interlock safety protection, solving the technical problem that the electric drain valve may be opened accidentally due to controller software failure or mis-triggering, leading to the discharge of substandard water and causing environmental pollution.

[0064] The scope of protection of this invention is not limited to the above embodiments. In particular, the ozone disinfection control system of this invention can be applied to any water treatment scenario requiring ozone disinfection, and is not limited to the circulating pipeline system architecture in the above embodiments. Any non-substantial changes made to specific parameters (such as CT target value, oxidation-reduction potential threshold, sensor selection, controller type, ozone dosing method, residual ozone decomposition method), number of equipment, or process sequence in the technical solution based on the concept of this invention are all within the scope of protection of this invention.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An ozone disinfection control system, characterized in that, include: Dissolved ozone sensor is used to continuously collect the concentration of dissolved ozone in water to be disinfected; An oxidation-reduction potential sensor is used to continuously collect the oxidation-reduction potential in the water body to be disinfected; An electric drain valve is used to control the discharge of water after disinfection. The controller is electrically connected to the dissolved ozone sensor, the oxidation-reduction potential sensor, and the electric drain valve, respectively. The controller is configured to: The system receives signals from the dissolved ozone sensor and the redox potential sensor, calculates the CT integral value in real time by numerical integration, and compares the CT integral value with a preset CT target value. The CT integral value is obtained by numerically integrating the dissolved ozone concentration over time. When the CT integral value reaches or exceeds the CT target value, and the oxidation-reduction potential collected by the oxidation-reduction potential sensor reaches or exceeds the preset oxidation-reduction potential threshold during the disinfection contact time, the disinfection is determined to be complete. Once disinfection is complete, ozone addition will automatically stop, and residual ozone will be decomposed. Once the residual ozone concentration drops to a preset emission standard, the electric drain valve is automatically opened to discharge the water.

2. The ozone disinfection control system according to claim 1, characterized in that, It also includes a temperature sensor for collecting the water temperature of the water to be disinfected; the controller also receives the signal from the temperature sensor and corrects the CT target value according to the water temperature, wherein the CT target value is increased when the water temperature decreases and decreased when the water temperature increases.

3. The ozone disinfection control system according to claim 2, characterized in that, It also includes a pH sensor for collecting the pH value of the water to be disinfected; the controller also receives the signal from the pH sensor and corrects the oxidation-reduction potential threshold according to the pH value, wherein the oxidation-reduction potential threshold is decreased when the pH value increases and increased when the pH value decreases.

4. The ozone disinfection control system according to claim 1, characterized in that, The controller also incorporates an ozone degradation kinetic model; after ozone addition is stopped, the controller predicts the time required for the residual ozone concentration to drop to the preset emission standard based on the initial value of dissolved ozone concentration at the time of cessation, and outputs a safe emission time forecast to the user.

5. The ozone disinfection control system according to claim 4, characterized in that, The ozone degradation kinetic model adopts first-order reaction kinetics, with ozone concentration decreasing exponentially and the decay rate constant being corrected for water temperature.

6. The ozone disinfection control system according to claim 1, characterized in that, The preset oxidation-reduction potential threshold is a set value within the range of 650mV to 750mV; the CT target value is set according to the disinfection procedure of the type of object to be disinfected, and the value range is 1.5mg·min / L to 5mg·min / L.

7. The ozone disinfection control system according to claim 1, characterized in that, The controller is also electrically connected to the valves and ozone generator in the disinfection pipeline; the controller automatically controls the switching of the valves, ozone generator and electric drain valve at each stage of the disinfection process.

8. A sterilization machine, characterized in that, The ozone disinfection control system includes any one of claims 1 to 7.

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