A continuous flow disinfection reactor system and method for water disinfection using the same

Abstract

The application discloses a continuous flow disinfection reactor system, which comprises a double-chamber photocatalytic reaction unit and a Fenton disinfection unit; the double-chamber photocatalytic reaction unit is composed of a photocatalytic chamber and a microorganism chamber, and a semi-permeable membrane with a molecular interception amount of 12000-14000 Da is arranged between the photocatalytic chamber and the microorganism chamber; the microorganism chamber is provided with a water inlet and a water outlet, water to be treated enters the microorganism chamber through the water inlet, and the water outlet is connected with the Fenton disinfection unit through a pipeline; a visible light source is arranged in the photocatalytic chamber and loaded with a photocatalyst; the Fenton disinfection unit is provided with Fe 2+ An injection device and a disinfectant water outlet are arranged for disinfecting mixed water delivered by the double-chamber photocatalytic reaction unit. The semi-permeable membrane is used to separate the photocatalytic chamber and the microorganism chamber, so that the two chambers are separated in space, and the synthesized H2O2 can be exclusively and effectively transferred to the Fenton reaction site for disinfection, the photocatalytic efficiency is high, the sterilization effect is remarkable, and the application provides a potential solution for water pollution.

Description

Technical Field

[0001] This invention belongs to the field of photocatalysis technology, and specifically relates to a continuous flow disinfection reactor system and a method for water disinfection using the same. Background Technology

[0002] Waterborne diseases caused by pathogenic microorganisms pose a significant threat to human health and safety, particularly in developing countries. It is estimated that 3.6 billion people worldwide currently live in water-scarce areas, a number that could increase to 5.7 billion by 2050, leading to fierce competition among water users. Therefore, it is essential to develop new water treatment technologies and improve aquatic hygiene to ensure water recycling, which is crucial for remote areas with little or no access to clean water. Point-of-use (POU) disinfection technologies are gaining increasing attention due to their cost-effectiveness and convenience, gradually becoming a popular water disinfection technology in rural areas of developing countries. Advanced oxidation technologies (AOPs) are among the relatively low-cost and simple-to-operate POU technologies. Utilizing the inexhaustible resource of sunlight, the light / oxidant system is the most cost-effective combination among AOPs. Among various oxidants, hydrogen peroxide (H₂O₂) has the highest atomic efficiency and strong oxidizing properties, making light / H₂O₂ increasingly used in water disinfection research.

[0003] Chinese patent application CN201811013305.0 discloses a wastewater treatment system and method based on Fenton technology. The system includes a sand filter tank connected in sequence, designed to trap pollutants in the wastewater; a Fenton reactor, where activated carbon acts as a catalyst to react with hydrogen peroxide to generate hydroxyl radicals; a reaction tank to remove excess hydrogen peroxide from the Fenton reactor; and a clear water tank to adjust the pH of the wastewater within it. In this design, activated carbon acts as both an adsorbent and a catalyst. Firstly, it enriches pollutants through adsorption, reducing their concentration. Simultaneously, it catalyzes the formation of ·OH radicals from H₂O₂, facilitating the reaction and degradation of pollutants and significantly improving reaction efficiency. However, due to the low efficiency of light / H₂O₂, Fe is typically required. 2+ Fenton initiates the conversion of H2O2 into the highly oxidizing ·OH, thereby achieving efficient water disinfection.

[0004] Over the past decade, most research has focused on developing high-performance photocatalysts for H2O2 production, achieving exciting progress. For example, Chinese patent application CN202211555203.8 discloses a Fenton reaction catalyst for industrial wastewater treatment, its preparation method, and its application, belonging to the field of wastewater treatment technology. The catalyst of this invention comprises pre-magnetized zero-valent iron and hydrogen peroxide. By pre-magnetizing the zero-valent iron in a strong magnetic field and then combining it with hydrogen peroxide, it is added to the wastewater to form a highly efficient catalyst with high catalytic efficiency and good stability.

[0005] However, besides advanced photocatalytic materials, the effective application of photocatalytic H2O2 production for water disinfection depends on innovative reactor design and operation methods. The main factors restricting reactor design are as follows: (1) Photocatalytic / self-supplied H2O2 / Fe 2+ Microorganisms and photocatalysts in the system are often in the same space. The adhesion of microorganisms leads to scaling and recycling problems of photocatalysts; (2) Photocatalysts are easily damaged by unfavorable solvent systems in practical applications. Inorganic salts and organic matter in real water bodies will seriously interfere with the catalytic performance of photocatalysts; (3) The dependence on light is based on the default limitation of light-related applications. The key to solving the above problems is to separate the photocatalyst from the microorganisms. Therefore, this invention designs a photocatalytic reactor based on the "zoning system" of H2O2 stability. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a continuous flow disinfection reactor system and a method for water disinfection using the same. This continuous flow disinfection reactor system performs photocatalytic reactions in the visible light wavelength range. A novel dual-chamber photocatalytic reactor is designed based on a "zoning system," and a semi-permeable membrane separates the photocatalytic chamber and the microbial chamber. This allows the photosynthetically synthesized H2O2 to be exclusively and effectively transferred to the Fenton reaction site for disinfection. This continuous flow disinfection reactor system exhibits high photocatalytic efficiency, significant sterilization effect, and a simple and convenient synthesis method, providing a potential solution for water pollution.

[0007] The technical solution of the present invention is as follows:

[0008] One objective of this invention is to provide a continuous flow sterilization reactor system, which includes a dual-chamber photocatalytic reaction unit and a Fenton sterilization unit;

[0009] The dual-chamber photocatalytic reaction unit consists of a photocatalytic chamber and a microbial chamber, with a semi-permeable membrane between them. The molecular cutoff of the semi-permeable membrane is 12000-14000 Da. The microbial chamber has an inlet and an outlet. The water to be treated enters the microbial chamber through the inlet, and the outlet is connected to the Fenton disinfection unit via a pipe. The photocatalytic chamber contains a visible light source and is loaded with a photocatalyst.

[0010] Fenton sterilization unit: equipped with Fe 2+ The injection device and disinfectant outlet are used to disinfect the mixed water supplied from the dual-chamber photocatalytic reaction unit.

[0011] Furthermore, the visible light source is a 300W xenon lamp.

[0012] Furthermore, the amount of the photocatalyst used is 5 mg.

[0013] A second objective of this invention is to provide a method for water disinfection using any of the above-mentioned continuous flow disinfection reactor systems, comprising the following steps:

[0014] S11: The water to be treated enters the microbial chamber of the dual-chamber photocatalytic reaction unit through the inlet, and H2O enters the photocatalytic chamber through the semi-permeable membrane;

[0015] S12: Under the irradiation of visible light and the action of photocatalyst, photocatalytic reaction continuously occurs in the photocatalytic chamber to produce H2O2. Due to the concentration difference effect, H2O2 passes through the semipermeable membrane in an orderly manner and mixes with the water to be treated in the microbial chamber to obtain mixed water containing H2O2.

[0016] S13: Mixed water containing H2O2 enters the Fenton disinfection unit through pipes, where it reacts with the injected Fe... 2+ The Fenton reaction generates highly reactive hydroxyl radicals, which in turn kill bacteria. The disinfected water is then discharged through the disinfected water outlet, thus completing the water disinfection process.

[0017] Further, in step S12, the photocatalyst is a composite polyvinylpyrrolidone covalent organic framework photocatalyst, namely FCOF / PVP, which is composed of a covalent organic framework photocatalyst and polyvinylpyrrolidone through a solvothermal reaction.

[0018] Furthermore, the preparation method of the composite polyvinylpyrrolidone covalent organic framework photocatalyst includes the following steps:

[0019] S21: 178 mg of 4,4',4”-(1,3,5-triazine-2,4,6-triyl)triphenylamine and 155 mg of 2,3,5,6-tetrafluoro-terephthalaldehyde were placed in a 25 mL thick-walled solvent storage bottle containing 2 mL of mesitylene and 18 mL of 1,4-dioxane. After adding 1 mL of 6 mol / L acetic acid aqueous solution, the sample was rapidly frozen with liquid nitrogen and degassed by three freeze-evacuation-thawing cycles. After thawing to room temperature, the sample was heated in a constant temperature drying oven at 120 °C for 72 h. The precipitate was washed three times by centrifugation with N,N-dimethylformamide, tetrahydrofuran, and n-hexane, respectively. The wet sample was then dried in a vacuum drying oven at 80 °C for 12 h to obtain FCOF.

[0020] S22: Weigh 25 mg of FCOF obtained in step S21 and x mg of polyvinylpyrrolidone into a 50 mL beaker, where x is 0-200. Add 30 mL of N,N-dimethylformamide, sonicate for 15 min, and stir for 2 h to mix evenly. Transfer the mixture to a 50 mL polytetrafluoroethylene-lined reactor and react at 180 °C for 48 h. After the reaction is completed and cooled to room temperature, collect the solid precipitate and wash it 5 times with ultrapure water. Dry it under vacuum at 60 °C for 12 h to obtain the composite polyvinylpyrrolidone covalent organic framework photocatalyst, namely FCOF / PVP-x.

[0021] Furthermore, in step S21, the acetic acid aqueous solution is 6 mol / L.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention provides a continuous flow disinfection reactor system that utilizes a semi-permeable membrane to separate the photocatalytic chamber and the microbial chamber, spatially separating the catalyst and microorganisms. This achieves efficient photocatalytic production of H2O2 and efficient transfer of H2O2 to the Fenton disinfection zone, retaining the substantial advantages of both homogeneous and heterogeneous catalysis in the reaction, avoiding blockage of active sites due to microbial adhesion, and extending the catalyst's lifespan. Simultaneously, this invention enables the exclusive and efficient transfer of photosynthesized H2O2 to the Fenton reaction site for disinfection. This continuous flow disinfection reactor system exhibits high photocatalytic efficiency, significant sterilization effect, and a simple and convenient synthesis method, providing a potential solution for water pollution.

[0024] 2. The present invention provides a method for water disinfection using a continuous flow disinfection reactor system. Through dual-chamber partition design, photocatalysis-Fenton coupling mechanism and continuous flow process optimization, it achieves efficient sterilization, providing an efficient, green and scalable technical path for the field of water disinfection, and has significant industrial application value.

[0025] 3. In this invention, the photocatalyst used is a composite polyvinylpyrrolidone covalent organic framework photocatalyst. This catalyst improves the yield of H2O2 across the entire wavelength range by coupling FCOF and PVP. Due to the conjugation effect between FCOF and PVP, FCOF / PVP tends to transfer more e- ions... - Transfer to the interface to adsorb O2 to generate ·O2 - And further used to generate H2O2. Meanwhile, PVP modification can improve the material's... 1 O2 conversion, 1 O2 transfers energy to the surface-adsorbed O2, which is then converted into H2O2. Under ultraviolet light, due to the protection of PVP, the H2O2 generated in the system will not be decomposed into ·OH by ultraviolet light, thereby further increasing the amount of H2O2 produced by the catalyst. Attached Figure Description

[0026] Figure 1 The X-ray powder diffraction patterns of FCOF prepared in Example 1 and FCOF / PVP-100 prepared in Example 3 are shown below.

[0027] Figure 2 The Fourier transform infrared spectra of FCOF prepared in Example 1 and FCOF / PVP-100 prepared in Example 3 in this invention are shown below.

[0028] Figure 3 This is a diagram showing the effect of visible light photocatalytic preparation of hydrogen peroxide using FCOF prepared in Example 1 and FCOF / PVP-x prepared in Examples 1-5 under pure water conditions in this invention.

[0029] Figure 4 This is a schematic diagram of the partitioned chambers of each region in the continuous flow sterilization reactor system of the present invention;

[0030] Figure 5 This is a flowchart of water disinfection using a continuous flow disinfection reactor system in this invention;

[0031] Figure 6 This is a schematic diagram showing the H2O2 concentration changes in different regions of FCOF / PVP-100 in the continuous flow sterilization reactor system during 10 hours of light exposure followed by 2 hours of darkness, as described in this invention.

[0032] Figure 7 This is a schematic diagram illustrating the inactivation of Escherichia coli in sterile saline by adding FCOF / PVP-100 to a continuous flow sterilization reactor system in this invention. Detailed Implementation

[0033] The following describes a preferred embodiment, with reference to the appendix. Figure 1-7To further illustrate the present invention, the endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values; for numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered as specifically disclosed herein; the materials, reagents, etc. used in the following embodiments are commercially available unless otherwise specified; the experimental methods in the following embodiments are conventional methods unless otherwise specified.

[0034] Example 1

[0035] This embodiment provides a composite polyvinylpyrrolidone covalent organic framework photocatalyst, the preparation method of which includes the following steps:

[0036] S21: 178 mg of 4,4',4”-(1,3,5-triazine-2,4,6-triyl)triphenylamine and 155 mg of 2,3,5,6-tetrafluoroterephthalaldehyde were placed in a 25 mL thick-walled solvent storage bottle containing 2 mL of mesitylene and 18 mL of 1,4-dioxane. After adding 1 mL of acetic acid aqueous solution (6 mol / L), the sample was rapidly frozen with liquid nitrogen and degassed by three freeze-evacuation-thawing cycles. After thawing to room temperature, the sample was heated in a constant temperature drying oven at 120 °C for 72 h. The precipitate was washed three times by centrifugation with N,N-dimethylformamide, tetrahydrofuran, and n-hexane, respectively. The wet sample was then dried overnight in a vacuum drying oven at 80 °C to obtain FCOF.

[0037] S22: Weigh 25 mg of FCOF obtained in step S21 and x mg of polyvinylpyrrolidone into a 50 mL beaker, add 30 mL of N,N-dimethylformamide, sonicate for 15 min and stir for 2 h to mix evenly, then transfer the mixture to a 50 mL polytetrafluoroethylene-lined reactor and react at 180 °C for 48 h. After the reaction is completed and cooled to room temperature, collect the solid precipitate and wash it 5 times with ultrapure water. Dry it under vacuum at 60 °C overnight to obtain the composite polyvinylpyrrolidone covalent organic framework photocatalyst, namely FCOF / PVP-x.

[0038] In this embodiment, x is 0, and the resulting composite polyvinylpyrrolidone covalent organic framework photocatalyst is FCOF / PVP-0.

[0039] Example 2

[0040] This embodiment provides a composite polyvinylpyrrolidone covalent organic framework photocatalyst, which is basically the same as that in Example 1, except that:

[0041] In this embodiment, x is 50, and the resulting composite polyvinylpyrrolidone covalent organic framework photocatalyst is FCOF / PVP-50.

[0042] Example 3

[0043] This embodiment provides a composite polyvinylpyrrolidone covalent organic framework photocatalyst, which is basically the same as that in Example 1, except that:

[0044] In this embodiment, x is 100, and the resulting composite polyvinylpyrrolidone covalent organic framework photocatalyst is FCOF / PVP-100.

[0045] Example 4

[0046] This embodiment provides a composite polyvinylpyrrolidone covalent organic framework photocatalyst, which is basically the same as that in Example 1, except that:

[0047] In this embodiment, x is 150, and the resulting composite polyvinylpyrrolidone covalent organic framework photocatalyst is FCOF / PVP-150.

[0048] Example 5

[0049] This embodiment provides a composite polyvinylpyrrolidone covalent organic framework photocatalyst, which is basically the same as that in Example 1, except that:

[0050] In this embodiment, x is 200, and the resulting composite polyvinylpyrrolidone covalent organic framework photocatalyst is FCOF / PVP-200.

[0051] Example 6

[0052] This embodiment provides a continuous flow sterilization reactor system, which includes a dual-chamber photocatalytic reaction unit and a Fenton sterilization unit;

[0053] The dual-chamber photocatalytic reaction unit consists of a photocatalytic chamber and a microbial chamber, separated by a semi-permeable membrane. This membrane has a molecular cutoff of 12000-14000 Da, allowing only small molecules such as H2O and H2O2 to flow freely, while preventing the photocatalyst and microorganisms from passing through. The microbial chamber has an inlet and an outlet; the water to be treated enters the microbial chamber through the inlet, and the outlet is connected to the Fenton disinfection unit via a pipe. The photocatalytic chamber contains a visible light source and is loaded with a photocatalyst.

[0054] Fenton sterilization unit: equipped with Fe 2+ The injection device and disinfectant outlet are used to disinfect the mixed water supplied from the dual-chamber photocatalytic reaction unit.

[0055] Example 7

[0056] This embodiment provides a method for water disinfection using the continuous flow disinfection reactor system of Example 6, including the following steps:

[0057] S11: The water to be treated enters the microbial chamber of the dual-chamber photocatalytic reaction unit through the inlet, and H2O enters the photocatalytic chamber through the semi-permeable membrane;

[0058] S12: Under the irradiation of visible light and the action of photocatalyst, photocatalytic reaction continuously occurs in the photocatalytic chamber to produce H2O2. Due to the concentration difference effect, H2O2 passes through the semipermeable membrane in an orderly manner and mixes with the water to be treated in the microbial chamber to obtain mixed water containing H2O2.

[0059] S13: Mixed water containing H2O2 enters the Fenton disinfection unit through pipes, where it reacts with the injected Fe... 2+ The Fenton reaction generates highly reactive hydroxyl radicals, which in turn kill bacteria. The disinfected water is then discharged through the disinfected water outlet, thus completing the water disinfection process.

[0060] Implementation effect evaluation:

[0061] Figure 1 The X-ray powder diffraction patterns of FCOF prepared in Example 1 and FCOF / PVP-100 prepared in Example 3 of this invention are shown below. Figure 1 As can be seen, FCOF / PVP-100 exhibits characteristic diffraction peaks consistent with FCOF, indicating that the modification of amorphous PVP did not change the crystal structure of the parent material.

[0062] Figure 2 The Fourier transform infrared spectra of FCOF prepared in Example 1 and FCOF / PVP-100 prepared in Example 3 of this invention are shown below. Figure 2 As can be seen, FCOF / PVP-100 exhibits characteristic absorption peaks consistent with FCOF, indicating that the modification of amorphous PVP did not change the framework structure of the parent material.

[0063] Figure 3 The images show the effects of visible light photocatalytic preparation of hydrogen peroxide using FCOF prepared in Example 1 and FCOF / PVP-x prepared in Examples 1-5 under pure water conditions. The visible light source was a 300W xenon lamp, the amount of photocatalyst was 5 mg, and the reaction system was 50 mL of ultrapure water. Figure 3 As can be seen, compared with the parent material FCOF, the FCOF / PVP-100 obtained in Example 3 has a higher hydrogen peroxide production performance of 1763.50 μmol / g / h.

[0064] Figure 4 This is a schematic diagram of the partitioned chambers of the continuous flow sterilization reactor system in Embodiment 6 of the present invention. Figure 4 As shown, the photocatalytic area is divided into two compartments: compartment 1 (photocatalytic chamber) and compartment 2 (microbial chamber), which are connected by a pipe.

[0065] Figure 5 This is a flowchart of the continuous flow sterilization reactor system of Embodiment 6 of the present invention. Figure 5 As shown, the continuous flow disinfection reactor system includes a dual-chamber photocatalytic reaction unit and a Fenton disinfection unit. The dual-chamber photocatalytic reaction unit consists of a photocatalytic chamber and a microbial chamber, separated by a semi-permeable membrane that isolates the microorganisms from the photocatalyst. The photocatalytic chamber is responsible for the photosynthesis of H2O2. The H2O2 then passes through the semi-permeable membrane and mixes with pathogenic microorganisms carried by the influent in the microbial chamber. The mixed water containing H2O2 enters the Fenton disinfection zone through pipes, where it reacts with injected Fe2O3. 2+ A Fenton reaction occurs, achieving sterilization. The resulting water can be used for household purposes or irrigation.

[0066] Figure 6 In the continuous flow reactor system of Example 6 of this invention, the H2O2 changes in different regions during a period of 10 hours of light exposure followed by 2 hours of darkness were observed using FCOF / PVP-100 prepared in Example 3. Figure 6 As can be seen, after 3 hours of hydraulic retention time (HRT) and 10 hours of light exposure, the H2O2 concentration in the photocatalysis chamber continued to rise steadily and flowed to the microbiology chamber and the Fenton disinfection unit through the concentration gradient effect.

[0067] In addition, a large amount of residual H2O2 remained in the photocatalysis chamber. After the lights were turned off for 2 hours, the H2O2 gradually diffused from the photocatalysis chamber into the microbiology chamber and the Fenton sterilization unit. Fe was then added... 2+ The fact that the Fenton reaction can still occur afterward indicates that the system has the potential to perform continuous sterilization under dark conditions.

[0068] Figure 7 This diagram illustrates the inactivation of *E. coli* in sterile physiological saline by the FCOF / PVP-100 prepared in Example 3 within the continuous flow sterilization reactor system of Example 6. The sterilization capability of this continuous flow reactor system was evaluated using *E. coli* at a concentration close to that in the natural environment of 5 log cfu / mL. After 3 hours of HRT, the concentration of *E. coli* in the microbiology chamber did not change significantly, but no *E. coli* was detected in the effluent. This indicates that H2O2 alone has little inactivating effect on *E. coli*, and the Fenton reaction is the root cause of bacterial death. After 2 hours of darkness, the Fenton reaction in the dark achieved sustained inactivation of *E. coli*.

[0069] To prevent bacterial adhesion to the photocatalyst, minimize solvent damage, and achieve effective separation and recovery of the photocatalyst in the photocatalytic zone, this invention designs a novel dual-chamber reactor. A semi-permeable membrane with a molecular cutoff of 12000-14000 Da is placed in the middle of the reactor, separating the two chambers. This membrane allows only small molecules such as H2O and H2O2 to flow freely, while the photocatalyst and microorganisms cannot pass through. In the sterilization experiment, 50 mg of FCOF / PVP-100 is placed in the photocatalytic compartment and continuously undergoes a photocatalytic reaction under visible light irradiation to produce H2O2. Due to the concentration gradient, H2O2 can pass through the semi-permeable membrane in an orderly manner, mix with the influent, and then flow together to the Fenton reaction zone, continuously supplying the Fenton reaction as an oxidant. This continuous flow sterilization reactor system exhibits high photocatalytic efficiency, significant sterilization effect, and a simple and convenient synthesis method, providing a potential solution for water pollution.

[0070] Furthermore, the photocatalyst used in this invention is a composite polyvinylpyrrolidone covalent organic framework photocatalyst. This catalyst improves the yield of H2O2 across the entire wavelength range by coupling FCOF and PVP. Due to the conjugation effect between FCOF and PVP, FCOF / PVP tends to transfer more e- ions... - Transfer to the interface to adsorb O2 to generate ·O2 - This energy is then used to generate H2O2. Simultaneously, after PVP surface modification, FCOF can generate long-lived photobioorganisms that transfer energy to the surface-adsorbed O2, generating... 1 O2 is then converted into H2O2. Under ultraviolet light, due to the protection of PVP, the H2O2 generated in the system will not be decomposed into ·OH by ultraviolet light, which can further increase the amount of H2O2 produced by the catalyst.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A method for water disinfection using a continuous flow disinfection reactor system, characterized in that, The continuous flow sterilization reactor system includes a dual-chamber photocatalytic reaction unit and a Fenton sterilization unit; The dual-chamber photocatalytic reaction unit consists of a photocatalytic chamber and a microbial chamber, with a semi-permeable membrane between them. The molecular cutoff of the semi-permeable membrane is 12000-14000 Da. The microbial chamber has an inlet and an outlet. The water to be treated enters the microbial chamber through the inlet, and the outlet is connected to the Fenton disinfection unit via a pipe. The photocatalytic chamber contains a visible light source and is loaded with a photocatalyst. Fenton sterilization unit: equipped with Fe 2+ The injection device and disinfectant outlet are used to disinfect the mixed water supplied from the dual-chamber photocatalytic reaction unit; The method for water disinfection using a continuous flow disinfection reactor system includes the following steps: S11: The water to be treated enters the microbial chamber of the dual-chamber photocatalytic reaction unit through the inlet, and H2O enters the photocatalytic chamber through the semi-permeable membrane; S12: Under the irradiation of visible light and the action of photocatalyst, photocatalytic reaction continuously occurs in the photocatalytic chamber to produce H2O2. Due to the concentration difference effect, H2O2 passes through the semipermeable membrane in an orderly manner and mixes with the water to be treated in the microbial chamber to obtain mixed water containing H2O2. S13: Mixed water containing H2O2 enters the Fenton disinfection unit through pipes, where it reacts with the injected Fe... 2+ The Fenton reaction generates highly reactive hydroxyl radicals, which in turn kill bacteria. The disinfected water is then discharged through the disinfected water outlet, thus completing the water disinfection process. In step S12, the photocatalyst is a composite polyvinylpyrrolidone covalent organic framework photocatalyst, namely FCOF / PVP, which is composed of a covalent organic framework photocatalyst and polyvinylpyrrolidone through a solvothermal reaction. The preparation method of the composite polyvinylpyrrolidone covalent organic framework photocatalyst includes the following steps: S21: 178 mg of 4,4',4''-(1,3,5-triazine-2,4,6-triyl)triphenylamine and 155 mg of 2,3,5,6-tetrafluoroterephthalaldehyde were placed in a 25 mL thick-walled solvent storage bottle containing 2 mL of mesitylene and 18 mL of 1,4-dioxane. After adding 1 mL of 6 mol / L acetic acid aqueous solution, the sample was rapidly frozen with liquid nitrogen and degassed by three freeze-evacuation-thawing cycles. After thawing to room temperature, the sample was heated in a constant temperature drying oven at 120 °C for 72 h. The precipitate was washed three times by centrifugation with N,N-dimethylformamide, tetrahydrofuran, and n-hexane, respectively. The wet sample was then dried in a vacuum drying oven at 80 °C for 12 h to obtain FCOF. S22: Weigh 25 mg of FCOF obtained in step S21 and x mg of polyvinylpyrrolidone into a 50 mL beaker, where x is 0-200. Add 30 mL of N,N-dimethylformamide, sonicate for 15 min, and stir for 2 h to mix evenly. Transfer the mixture to a 50 mL polytetrafluoroethylene-lined reactor and react at 180 °C for 48 h. After the reaction is completed and cooled to room temperature, collect the solid precipitate and wash it 5 times with ultrapure water. Dry it under vacuum at 60 °C for 12 h to obtain the composite polyvinylpyrrolidone covalent organic framework photocatalyst, namely FCOF / PVP-x.

2. The method for water disinfection using a continuous flow disinfection reactor system according to claim 1, characterized in that, The visible light source is a 300 W xenon lamp.

3. The method for water disinfection using a continuous flow disinfection reactor system according to claim 1, characterized in that, The amount of the photocatalyst used is 5 mg.

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