Water treatment system based on UV / H2O2 oxidation and biological porous medium coupling

Abstract

The utility model discloses a water treatment system based on UV / H2O2 oxidation and biological porous medium coupling, the water treatment system comprises a UV / H2O2 oxidation device and a biological activity device which are in fluid communication in sequence, the UV / H2O2 oxidation device adds hydrogen peroxide to a to-be-treated water body and performs ultraviolet radiation to generate a first treatment flow; the biological activity device comprises a first porous medium bed and a second porous medium bed, a biological membrane is attached to the surface of a porous medium of the second porous medium bed, the first treatment flow sequentially passes through the first porous medium bed to remove residual H2O2 and strengthen oxidative degradation of organic matters, and the second porous medium bed further biologically adsorbs and degrades small molecule byproducts; finally, treated water with purer water quality is obtained. According to the method, the organic micropollutants can be efficiently removed, meanwhile, H2O2 residues are avoided, effluent intermediate products are controllable, and the technical defects that the organic micropollutants are not completely removed and byproducts are risky in a single technology are overcome.

Description

Technical Field

[0001] This application belongs to the field of advanced water treatment technology, and specifically relates to a water treatment system based on the coupling of UV / H2O2 oxidation and biological porous media. Background Technology

[0002] The concentration of organic micropollutants in water ranges from nanograms per liter (ng / L) to micrograms per liter (μg / L). Due to their high toxicity and difficulty in degradation, conventional treatment processes are unlikely to effectively remove these organic micropollutants, directly affecting the operational efficiency of waterworks and the safe supply of drinking water.

[0003] For the control of organic micropollutants in water, selecting advanced treatment technologies is crucial. Advanced oxidation processes (AOPs), which generate free radicals at ambient temperature and pressure to achieve effective water purification, are generally considered effective technologies for degrading organic micropollutants in water. Among these, the UV / H2O2 process is one of the most widely used AOPs in water supply engineering. UV / H2O2 is most commonly used to remove odor-causing substances from drinking water to address seasonal sudden odor problems. It is also frequently used to remove other recalcitrant organic micropollutants, such as pharmaceuticals, algal toxins, and disinfection byproduct precursors.

[0004] However, UV / H2O2 technology also has some limitations. In practical applications, the effluent from UV / H2O2 oxidation often suffers from residual hydrogen peroxide (H2O2) and the generation of small-molecule organic byproducts. Therefore, developing a deep water treatment system with significant removal efficiency for organic micropollutants and controllable toxic byproducts is of great significance for ensuring the safe supply of drinking water. Utility Model Content

[0005] To address the issues of H2O2 residue and small-molecule organic byproducts in existing UV / H2O2 water treatment processes, this application provides a water treatment system based on the coupling of UV / H2O2 oxidation and bioporous media. This system further adsorbs and degrades the UV / H2O2 oxidized effluent through porous media materials with attached microorganisms, and enhances the adsorption and degradation effect through a double-layer porous media bed. This effectively removes H2O2 residue and small-molecule organic byproducts, improving the decomposition and mineralization efficiency of organic pollutants in water.

[0006] In one aspect of this application, a water treatment system based on UV / H2O2 oxidation and bioporous media coupling is provided. The water treatment system includes a UV / H2O2 oxidation device and a bioactive device that are fluidly connected in sequence. The UV / H2O2 oxidation device adds hydrogen peroxide to the water to be treated and generates a first treated stream by ultraviolet irradiation. The bioactive device includes a bioreactor chamber and a first porous media bed and a second porous media bed filled in the bioreactor chamber. The bioreactor chamber receives the first treated stream and outputs a second treated stream treated by the first porous media bed and the second porous media bed. The first porous media bed and the second porous media bed are distributed sequentially along the flow direction of the first treated stream, and a biofilm is attached to the porous media surface of the second porous media bed.

[0007] In one embodiment, the biofilm is formed by passing effluent treated with UV / H2O2 oxidation into a porous media bed and allowing it to accumulate for 2 to 3 months, resulting in a biofilm formation on the surface of the porous media.

[0008] In one embodiment, the UV / H2O2 oxidation device includes a hydrogen peroxide dosing unit and an ultraviolet irradiation unit. The hydrogen peroxide dosing unit has a hydrogen peroxide storage container. Hydrogen peroxide is added to the hydrogen peroxide storage container and mixed with the water to be treated to form a pretreatment stream. The ultraviolet irradiation unit receives the pretreatment stream and oxidizes and degrades it using ultraviolet irradiation to generate a first treatment stream.

[0009] In one embodiment, the hydrogen peroxide dosing unit further includes a flow control device, the input of which is fluidly connected to the liquid storage container, and the output of which is fluidly connected to the water body to be treated.

[0010] In one embodiment, the hydrogen peroxide dosing unit further includes a mixing device that receives the water to be treated and hydrogen peroxide and mixes them to generate the pretreated stream.

[0011] In one embodiment, the UV / H2O2 oxidation apparatus includes an ultraviolet radiation source and an oxidation reaction chamber, wherein the ultraviolet radiation source is disposed within the oxidation reaction chamber, and the oxidation reaction chamber receives the pretreatment stream and outputs a first treatment stream oxidized and degraded by the ultraviolet radiation source.

[0012] In one embodiment, the porous medium of the first porous media bed is activated carbon particles that have been acid-washed and softened.

[0013] In one embodiment, the porous medium of the second porous media bed is bio-activated carbon.

[0014] In one embodiment, the bioactive device further includes an aeration mechanism disposed upstream of the first porous media bed along the flow direction of the first processing flow, the aeration mechanism injecting air toward the first porous media bed.

[0015] In one embodiment, the bioactive device further includes a water distribution plate rotatably connected to the bioreaction chamber, the water distribution plate being disposed upstream of the first porous media bed along the flow direction of the first processing flow.

[0016] In one embodiment, the water treatment system further includes a control unit for controlling the amount of hydrogen peroxide added and the intensity of ultraviolet irradiation in the UV / H2O2 oxidation device. The control unit includes a first sensor, a second sensor, and a PLC controller. The first sensor detects water quality data of the water to be treated, the second sensor detects data on toxic and harmful organic matter in the effluent of the biological activity device, and the PLC controller receives data collected by the first and second sensors to control the amount of hydrogen peroxide added to the UV / H2O2 oxidation device.

[0017] In one embodiment, the control unit further includes a third sensor, a fourth sensor, and a fifth sensor; the third sensor detects hydrogen peroxide concentration data in the water to be treated and the first treatment stream after hydrogen peroxide is added; the fourth sensor detects water transmittance data of the fluid after hydrogen peroxide is added; the fifth sensor detects ultraviolet light intensity data of the UV / H2O2 oxidation device; the PLC controller receives the hydrogen peroxide concentration data to control the amount of hydrogen peroxide added to the UV / H2O2 oxidation device; and the PLC controller receives the water transmittance data and the ultraviolet light intensity data to control the ultraviolet irradiation intensity of the UV / H2O2 oxidation device.

[0018] The beneficial effects of this application are as follows:

[0019] This application treats the effluent from UV / H2O2 oxidation using a bioporous media bed. The adsorption and degradation by the bioporous media bed effectively removes residual hydrogen peroxide and toxic intermediate byproducts from the effluent. Furthermore, the use of the bioporous media bed and the control of hydrogen peroxide and UV dosage achieve good water treatment results.

[0020] Meanwhile, the bioactive device features a dual-layer porous media bed design. The first layer is an acid-modified porous medium used for catalytic removal of residual H2O2 and further oxidative degradation of UV / H2O2-containing organic matter in the effluent, creating an oxygen-rich and biodegradable environment rich in small-molecule organic matter. The second layer is a bioactive porous adsorbent material, further degrading and adsorbing small-molecule organic matter in the effluent from the first layer. The water distribution plate and aeration structure are positioned above the first porous material packing layer to increase the contact between aerated air, oxygen, and liquid, facilitating absorption and utilization by microorganisms in the second porous material layer.

[0021] In summary, this system has significant effects in improving the treatment efficiency of organically polluted water bodies, reducing the content of organic pollutants, and reducing residual hydrogen peroxide and oxidation byproducts in the water. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the water purification coupling system of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the bioactive device in the water purification coupling system of this application;

[0024] In the diagram: 1. Liquid storage container, 2. Flow control device, 3. Mixing device, 4. Third sensor, 5. Fourth sensor, 6. Oxidation reaction chamber, 7. Ultraviolet radiation source, 8. Fifth sensor, 9. Aeration mechanism, 10. Biological reaction chamber, 11. First porous media bed, 12. Second porous media bed, 13. Aeration disc, 14. Gas supply system, 15. Water distribution disc, 16. First sensor, 17. Second sensor, 18. PLC controller. Detailed Implementation

[0025] The present application will now be described in detail. While specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0026] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0027] The UV / H2O2 process, as an advanced oxidation process (AOP), is widely used in water treatment to remove organic pollutants, especially excelling in removing odor-causing substances and other recalcitrant organic micropollutants from drinking water. However, this technology does have some limitations and problems in practical applications, mainly due to the residual hydrogen peroxide (H2O2) in the effluent and the potential generation of small-molecule organic byproducts.

[0028] The UV / H2O2 process works by using ultraviolet (UV) radiation to catalyze the decomposition of hydrogen peroxide, generating highly oxidizing hydroxyl radicals (·OH). These radicals can efficiently oxidize and decompose organic pollutants in water. However, insufficient UV radiation intensity, inadequate reaction time, or improper system design may result in some hydrogen peroxide not being completely decomposed, leaving residues in the treated water. Excessive UV radiation, on the other hand, can lead to uncontrollable byproducts. While H2O2 itself poses relatively little direct harm to human health, excessive residues can affect the taste and odor of the water. Furthermore, during subsequent pipeline transportation and storage, residual H2O2 may continue to decompose, producing oxygen and water, altering the physicochemical properties of the water, and even promoting microbial growth under certain conditions, thus affecting water quality safety.

[0029] Furthermore, while most organic pollutants can be effectively degraded during the UV / H2O2 oxidation process, some organic substances (especially those with complex structures or containing specific functional groups) may not be completely degraded during oxidation, instead transforming into low-molecular-weight organic byproducts. These byproducts may include aldehydes, ketones, carboxylic acids, etc., and some byproducts may be toxic or bioaccumulative. For example, dissolved organic matter (DOM) can react with reactive chlorine species during UV / chlorine (amine) advanced treatment to generate disinfection byproducts (DBPs), posing a potential threat to the environment and human health. In addition, the UV / H2O2 system may also produce some inorganic byproducts, such as nitrates and nitrites, through photochemical reactions. The excessive presence of these inorganic substances is also detrimental to water quality safety.

[0030] To minimize hydrogen peroxide (H2O2) residue and the generation of small-molecule organic byproducts, this application aims to fully utilize the advantages of the UV / H2O2 oxidation system while overcoming its potential limitations. To this end, a bioactive unit is integrated downstream of the UV / H2O2 oxidation device and equipped with an external control unit, forming a comprehensive water treatment system. On one hand, the bioactive unit is responsible for removing residual H2O2 from the water after UV / H2O2 oxidation and adsorbing toxic small-molecule organic byproducts generated in the intermediate stage. On the other hand, the control unit precisely regulates the dosage of H2O2 and the UV irradiation dose during the UV / H2O2 oxidation process, ensuring the effective synergistic effect of H2O2 and ultraviolet light, thereby reducing residues and intermediate byproducts in the treated water. Through this integrated design, the system achieves efficient and environmentally friendly water purification.

[0031] In one embodiment of this application, reference is made to Figure 1 As shown, a UV / H2O2 oxidation and bioporous media coupling system is provided. The system includes a UV / H2O2 oxidation device and a bioactive device, wherein the outlet pipe of the UV / H2O2 oxidation device is connected to the inlet water of the bioactive device.

[0032] Specifically, the UV / H2O2 oxidation device includes a hydrogen peroxide dosing unit and an ultraviolet irradiation unit. The hydrogen peroxide dosing unit is a hydrogen peroxide storage container 1, which is connected to the water inlet pipe of the ultraviolet irradiation unit via a pipeline. The hydrogen peroxide storage container 1 adds hydrogen peroxide to the water inlet pipe and mixes it with the water to be treated to form a pre-treatment stream. The pre-treatment stream then enters the ultraviolet irradiation unit along the water inlet pipe.

[0033] The ultraviolet irradiation unit includes an ultraviolet radiation source 7 and an oxidation reaction chamber 6. The ultraviolet radiation source 7 is installed in the oxidation reaction chamber 6. The oxidation reaction chamber 6 has an inlet and an outlet. The pretreatment stream enters the oxidation reaction chamber 6 from the inlet and is treated by the ultraviolet radiation source 7 to generate a first treatment stream. The first treatment stream is discharged from the outlet and input into the bioactive device through a pipeline.

[0034] The UV / H2O2 oxidation device of this application is a water treatment technology that utilizes ultraviolet light (UV) and hydrogen peroxide (H2O2). The pretreatment stream generated by the hydrogen peroxide dosing unit enters the UV irradiation unit. By irradiating the hydrogen peroxide in the pretreatment stream with ultraviolet light, highly reactive hydroxyl radicals (·OH) are generated. These radicals can non-selectively oxidize and decompose organic pollutants in the water to be treated. The organic pollutants are degraded into carbon dioxide, water, and other mineral salts, including recalcitrant organic matter, thereby achieving water purification.

[0035] In this application, the fluid is generally transported via pipeline, but it is not limited to this; any method of transporting liquid fluid is applicable here.

[0036] In this application, the hydrogen peroxide dosing unit is used to add hydrogen peroxide to the water body to be treated at a controlled flow rate and volume, forming a first treated stream. The hydrogen peroxide dosing unit is a device used to precisely add a specific chemical substance (such as hydrogen peroxide) to a target water body. It typically includes a storage container, a mixing tank (with agitator), a metering pump, a level gauge, an electrical control cabinet, pipelines, valves, safety valves, check valves, pressure gauges, filters, a base, etc., and can be configured according to the user's actual requirements.

[0037] Reference Figure 2 As shown, the bioactive device includes a bioreactor chamber 10 and a first porous media bed 11 and a second porous media bed 12 filled within the bioreactor chamber 10. The bioreactor chamber 10 is a cylinder with a cavity. The first porous media bed 11 and the second porous media bed 12 are disc-shaped, matching the inner diameter of the bioreactor chamber 10. The first porous media bed 11 and the second porous media bed 12 are fixed sequentially from top to bottom within the bioreactor chamber 10. An inlet is located at the top of the bioreactor chamber 10, and an outlet is located at the bottom. The first treated stream enters the bioreactor chamber 10 through the inlet, passes through the first porous media bed 11 and the second porous media bed 12, and is discharged from the outlet. The porous media of the first porous media bed 11 consists of activated carbon particles that have been acid-washed and softened, while the porous media of the second porous media bed 12 consists of activated carbon particles with a biofilm attached to their surface. The bioactive device utilizes a double-layer porous media bed to further treat residual H2O2 and oxidation byproducts. The first porous media bed 11 is activated carbon modified with acid, primarily used for catalytic removal of residual H2O2 and further oxidative degradation of organic matter in the UV / H2O2 effluent, creating an oxygen-rich and biodegradable environment rich in small molecules. The second porous media bed 12 is biological activated carbon, further used for microbial degradation and adsorption of small molecule organic matter in the effluent from the first porous media bed 11. The bioreactor chamber 10 is a container holding the bioporous media bed, typically designed to provide suitable environments, such as temperature, humidity, and light, to promote microbial growth and metabolic activity. The bioreactor chamber 10 can be sealed or semi-transparent to allow light penetration, promoting the growth of photosynthetic microorganisms. The size and shape of the bioreactor chamber 10 can be optimized according to treatment requirements; for example, it can be designed as a cuboid or cylinder to maximize the biofilm attachment area within the chamber.

[0038] In this application, the water body to be treated refers to water bodies that are polluted by organic matter and whose water quality indicators exceed the Class III water body standards of the "Surface Water Environmental Quality Standard" (GB3838-2002), including but not limited to the following categories: water bodies containing natural organic matter (NOM), water bodies containing artificially synthesized organic matter (SOC), water bodies containing endocrine disrupting substances, water bodies containing disinfection byproduct precursors, water bodies containing biodegradable organic matter, and water bodies containing sulfur-containing organic micropollutants.

[0039] In this application, hydrogen peroxide can be pure hydrogen peroxide or an aqueous solution of hydrogen peroxide. However, since it is a viscous liquid with a slightly irritating odor, it is not suitable for direct addition. Generally, an aqueous solution of hydrogen peroxide is more commonly chosen, and its concentration can be configured according to actual treatment needs.

[0040] In this application, a treatment stream refers to the fluid formed after water to be treated undergoes a series of treatments during the water treatment process. In this specific water treatment method, the treatment stream mainly refers to the water body after specific treatment steps, which includes contaminants in the raw water, added chemical oxidants (such as hydrogen peroxide), and byproducts generated through oxidation reactions. For example, the first treatment stream includes contaminants in the raw water, newly added hydrogen peroxide, and possible oxidation byproducts.

[0041] In this application, the storage container 1 is made of a material that does not react with hydrogen peroxide, preferably stainless steel (such as 304L or 316L) or pure aluminum, to prevent chemical reactions between the material and hydrogen peroxide. Since hydrogen peroxide easily decomposes into oxygen and water when heated, exposed to light, or encountering certain impurities, the storage container 1 should be designed with sun protection measures, such as a sunshade and rainproof canopy, to prevent prolonged exposure to sunlight or high-temperature environments from reducing the stability of hydrogen peroxide. Simultaneously, the storage container 1 should have a certain reserve capacity to accommodate possible volume changes of hydrogen peroxide at different temperatures. Furthermore, the storage container 1 should have a pressure-reducing valve or vent to ensure rapid pressure release during hydrogen peroxide decomposition, preventing explosions.

[0042] In this application, the ultraviolet radiation source 7 can be a low-pressure, low-pressure high-intensity, or medium-pressure UV lamp. Preferably, the UV lamp can be a low-pressure mercury lamp with a wavelength of 254 nanometers. This type of lamp has a large digestion coefficient under common ultraviolet light waves, can generate more hydroxyl radicals, and has good oxidation performance. Simultaneously, to improve the radiation effect, the installation angle of the UV lamp is between 15° and 30°. The oxidation reaction chamber 6 can be a pipe-type structure, which has the advantage of low head loss. Multiple ultraviolet lamps can be installed, and these lamps are circumferentially distributed along the axis within the reaction chamber. A quartz tube is sleeved on the outside of the ultraviolet lamp to protect the lamp and improve light transmittance. The inner corners of the reaction chamber can be rounded or equipped with 45° baffles to reduce dead water zones and low light intensity zones, thereby improving oxidation efficiency. Preferably, the ultraviolet radiation source 7 includes a UV lamp and a quartz tube, with the UV lamp coaxially sleeved inside the quartz tube, and the quartz tube coaxially fixed within the oxidation reaction chamber 6.

[0043] In this application, the porous media bed can be made of various materials, such as ceramics, metals, plastics, or activated carbon. Its structure can be a granular stacked bed, a honeycomb panel, a metal wire mesh, a foam ceramic, etc., preferably an activated carbon granular stacked bed. The preparation of activated carbon can start from various carbonaceous raw materials, such as wood, coconut shells, coal, bamboo, rice husks, etc. Activated carbon powder or granules are mixed with appropriate binders, such as starch, jute glue, polymers, etc., to maintain a certain shape and strength during the preparation process. These materials are filled into a preparation mold, and after molding, drying, and firing, a porous media bed with a porous structure is finally formed.

[0044] In this application, the oxidation decomposition byproducts are mainly organic lipids, organic aldehydes, ketones, organic phenols, etc., and also mainly include pesticides, drugs, disinfection byproducts, etc. Further analysis revealed that the oxidation byproducts also contain chloroform (a conventional indicator controlled by the drinking water hygiene standard GB5749-2022), atrazine (an extended indicator), dibutyl phthalate (a reference indicator), etc.

[0045] In this application, the biofilm is formed by passing UV / H2O2 oxidized effluent into a porous media bed and allowing it to accumulate for 2-3 months, forming a biofilm on the surface of the porous media. Microorganisms attach to the surface of the porous media through their flagella, cilia, and other structures, and begin to secrete extracellular polymers (EPS). The secreted EPS enhances the adhesion between the microorganisms and the porous media, forming an irreversible attachment. The microorganisms attached to the surface of the porous media begin to divide and form small colonies. The colonies gradually increase in size and cover the surface of the porous media, forming a mature biofilm.

[0046] In some embodiments, the water to be treated can be pretreated water. When the water to be treated does not meet the influent conditions, the influent is obtained through pretreatment methods such as biological pre-oxidation, coagulation sedimentation flotation, and sand filtration. Biological pre-oxidation is a method that uses the metabolism of microorganisms to remove or transform pollutants in water. In this process, microorganisms are introduced into the water to be treated, and they decompose organic pollutants through their metabolism, converting them into harmless substances such as carbon dioxide and water. This method can improve the biodegradability of the water quality, laying a good foundation for subsequent treatment steps. Coagulation sedimentation flotation is a water treatment method that removes suspended particles and colloidal substances by adding chemical coagulants. In the coagulation stage, chemical coagulants such as polyaluminum chloride (PAC) or polyferric sulfate (PFS) are added to the water, forming larger flocs with the suspended solids in the water. Subsequently, these flocs are separated from the water through sedimentation, thereby purifying the water quality. Sand filtration is a filtration technology that uses sand as a filter medium to remove suspended solids, microorganisms, and some organic pollutants from water. When water is passed through a sand layer, larger particles are intercepted, while smaller particles and dissolved pollutants are filtered out through the porous structure of the sand layer. Sand filtration can effectively remove turbidity and microorganisms from water, thus improving water quality.

[0047] In some embodiments, reference is made to Figure 1 and Figure 2As shown, the bioactive device also includes an aeration mechanism 9 and a water distribution tray 15. The aeration mechanism 9 is installed on top of the first porous media bed 11. The aeration mechanism 9 includes an aeration tray 13, an air distribution pipe, and a gas supply system 14. The aeration tray 13 is installed inside the bioreactor chamber 10 and located at the top of the first porous media bed 11 and at the bottom of the first treatment flow input pipe. The aeration tray 13 aerates the first porous media bed 11. The air distribution pipe connects the aeration tray 13 and the gas supply system 14, which is located outside the bioreactor chamber 10. The aeration mechanism 9 ensures sufficient contact between air and oxygen and the input first treatment flow, increasing the amount of air and oxygen in the first treatment process. This facilitates absorption by microorganisms in the second porous media bed 12, thereby enhancing the metabolic activity and degradation effect of the microorganisms. In this application, the aerator can be of various forms such as disc type, tube type, swirl type, jet type, etc.; the gas supply system 14 includes a blower or air compressor, air filter, etc., to provide the gas source required for aeration and purify the gas. The water distribution plate 15 is installed in the biological reaction chamber 10 and is located directly above the aeration plate 13. The water distribution plate 15 is a disc with a cavity, and several through holes are provided on the side surface facing the aeration plate 13. The water distribution plate 15 is connected to the outlet of the oxidation reaction chamber 6 through a pipeline. The first treatment flow is transported to the cavity of the water distribution plate 15 through the pipeline and sprayed onto the aeration plate 13 through the through holes to ensure full contact, thereby increasing the dissolved air and oxygen in the first treatment flow.

[0048] In some embodiments, refer again Figure 1 As shown, the hydrogen peroxide dosing unit also includes a flow control device 2. The input end of the flow control device 2 is connected to the hydrogen peroxide storage container 1 through a pipeline, and the output end of the flow control device 2 is connected to the water inlet pipeline of the ultraviolet irradiation unit through a pipeline. The flow control device 2 delivers hydrogen peroxide from the storage container 1 to the water inlet pipeline at a certain rate to form a pretreatment stream. The pretreatment stream is further introduced into the oxidation reaction chamber 6 for oxidation degradation to generate a first treatment stream.

[0049] In this application, the flow control device 2, used to precisely control the dosage of hydrogen peroxide, has a fluid inlet and a fluid outlet. The fluid inlet is connected to the storage container 1, and the fluid outlet is connected to the pipeline for transporting the water to be treated. The flow control device 2 is generally selected as a metering pump, which can be a peristaltic pump, a diaphragm pump, or a solenoid valve, to ensure that the dosage of hydrogen peroxide matches the volume of the water and the concentration of pollutants.

[0050] In some embodiments, refer again Figure 1As shown, to achieve uniform mixing of hydrogen peroxide and the water to be treated, the hydrogen peroxide dosing unit further includes a mixing device 3. The mixing device 3 receives and mixes the water to be treated and hydrogen peroxide to generate a pretreatment stream. In this mixing device 3, the water to be treated and hydrogen peroxide or its solution are introduced and thoroughly mixed to ensure that the hydrogen peroxide is uniformly dispersed in the water, thereby improving treatment efficiency. Specifically, the mixing device 3 has an inlet and an outlet. The inlet of the mixing device 3 is connected to the inlet pipe of the water to be treated, and the output of the flow control device 2 is connected to the inlet pipe of the water to be treated through a pipeline, delivering hydrogen peroxide from the storage container 1 to the inlet pipe of the water to be treated at a certain rate, thereby entering the mixing device 3 for thorough mixing to form a pretreatment stream. Alternatively, the mixing device 3 has a water inlet, a hydrogen peroxide inlet, and an outlet. The water inlet is connected to the water inlet pipeline, and the hydrogen peroxide inlet is connected to the output pipeline of the flow control device 2. The hydrogen peroxide and the water to be treated are mixed evenly by the mixing device 3, and the pretreated flow is output from the outlet of the mixing device 3.

[0051] In this application, the mixing device 3 can be a static mixer, a dynamic mixer, or any other device capable of effectively promoting the mixing of the water to be treated with hydrogen peroxide. Preferably, the mixing device 3 is a static mixer. Specifically, the mixing process of the static mixer is carried out by a mixing unit consisting of a series of different types of plate elements installed in a hollow pipe. Due to the action of the mixing unit, the fluid rotates left and right, constantly changing the direction of the flow mixer, pushing not only the central fluid to the periphery but also the peripheral fluid to the center, thereby creating a good radial mixing effect. At the same time, the rotational action of the fluid itself also occurs at the interface of the connection between adjacent components. This perfect radial circulation mixing effect ensures that the materials are mixed uniformly.

[0052] In some embodiments, refer again Figure 1As shown, the control unit includes a PLC controller 18, a first sensor 16, and a second sensor 17. The first sensor 16 is installed on the inlet pipe of the water to be treated and is used to detect the water quality data of the water to be treated. The second sensor 17 is installed on the outlet pipe of the bio-active device and is used to detect the toxic and harmful organic matter data of the effluent from the bio-active device. The first sensor 16 and the second sensor 17 are respectively connected to the PLC controller 18, which is further connected to the flow control device 2 in the UV / H2O2 oxidation device. Based on the data collected by the first sensor 16 and the second sensor 17, the PLC controller 18 controls the flow control device 2 to adjust the hydrogen peroxide dosage. At the initial stage of system operation, the PLC controller 18 receives data from the first sensor 16 and controls the amount of hydrogen peroxide added based on the water quality of the water to be treated. During operation, the second sensor 17 acquires information on the toxic and harmful substances in the effluent of the bioactive device. After receiving this information, the PLC controller 18 controls and adjusts the amount of hydrogen peroxide added by the hydrogen peroxide dosing unit until the toxic and harmful substances in the effluent of the bioactive device are reduced to the expected target. This closed-loop control system ensures the flexibility and adaptability of the treatment process, improves water treatment efficiency and quality, and reduces the amount of chemicals used, thereby reducing operating costs.

[0053] In this application, the PLC controller 18 (Programmable Logic Controller) is a digitally operated electronic system used for automated control. It can load control instructions into memory for storage and execution at any time. As the core control element in this unit, the PLC controller 18 is responsible for receiving sensor data, processing information, and controlling the operation of the hydrogen peroxide dosing unit according to preset logic. It possesses functions such as logic control, signal acquisition, data processing, timing and counting, output control, remote input / output, human-machine interface, and fault self-diagnosis. The first sensor 16 is responsible for detecting water quality parameters of the water entering the hydrogen peroxide dosing unit, such as pollutant concentration, pH value, dissolved oxygen, and turbidity. It can be a multi-parameter water quality sensor, capable of simultaneously measuring multiple water quality parameters, providing real-time data support for the decision-making process of the PLC controller 18. Depending on the needs, it can include conductivity sensors, pH sensors, dissolved oxygen sensors, etc., to ensure comprehensive monitoring of the influent water quality. The second sensor 17 is a specific chemical substance sensor, such as a COD sensor, ammonia nitrogen sensor, cyanobacteria sensor, or biosensor, specifically used to detect specific harmful substances in the water.

[0054] In this application, the second sensor 17 is a dedicated bioluminescent sensor that works by detecting the fluorescence intensity when toxic or harmful substances react with luminescent bacteria. It is developed based on the phenomenon that the fluorescence intensity weakens due to a decrease in the photorespiration rate of luminescent bacteria upon encountering toxic organic matter. When luminescent bacteria come into contact with toxic pollutants, their metabolism is affected, leading to a decrease in fluorescence intensity. This change in fluorescence intensity can be measured by a photosensitive sensor. The second sensor 17 may consist of a reaction chamber containing immobilized luminescent bacteria. The reaction chamber may be transparent to facilitate fluorescence detection. The second sensor 17 may be equipped with an optical fiber or photomultiplier tube for capturing and measuring the fluorescence intensity of the luminescent bacteria. The second sensor 17 uses specific luminescent bacteria, such as *Vibrio Fischerion*, *Vibrio qinghaiensis*, or *Bacillus luminifera*, which are highly sensitive to toxic or harmful substances in the environment. When they come into contact with these substances, their fluorescence intensity weakens or extinguishes.

[0055] In some embodiments, refer again Figure 1 As shown, the control unit also includes a third sensor 4, a fourth sensor 5, and a fifth sensor 8. The third sensor 4 is installed on the inlet and outlet pipes of the oxidation reaction chamber 6 to detect the hydrogen peroxide concentration data in the water to be treated and the first treatment stream after the addition of hydrogen peroxide. The fourth sensor 5 is installed on the inlet pipe of the oxidation reaction chamber 6 to detect the light transmittance data of the fluid after the addition of hydrogen peroxide. The fifth sensor 8 is installed inside the oxidation reaction chamber 6 on the outer wall of the quartz tube to detect the ultraviolet light intensity data of the ultraviolet radiation source 7. The third sensor 4, the fourth sensor 5, and the fifth sensor 8 are respectively connected to the PLC controller 18 circuit. At the same time, the ultraviolet light source is also connected to the PLC controller 18 circuit. The PLC controller 18 receives the hydrogen peroxide concentration data and controls the amount of hydrogen peroxide added to the UV / H2O2 oxidation device through the flow control device 2. The PLC controller 18 receives the water transmittance data and the ultraviolet light intensity data and controls the ultraviolet radiation light source 7 to control the ultraviolet irradiation intensity of the UV / H2O2 oxidation device.

[0056] In this application, the third sensor 4 is an electrochemical or optical sensor specifically designed to detect the concentration of hydrogen peroxide. Based on the amperometric principle, the third sensor 4 determines its concentration by measuring the current generated when hydrogen peroxide is oxidized or reduced on an electrode. Alternatively, based on the spectroscopic principle, it determines its concentration by measuring the absorption of light at a specific wavelength by H₂O₂. The fourth sensor 5 is an optical sensor used to measure the light transmittance of the water effluent from the hydrogen peroxide dosing unit. Light transmittance is an indicator of water clarity and is related to the content of suspended particulate matter in the water. The fourth sensor 5 typically consists of a light source and one or more photodetectors, capable of measuring the intensity attenuation of light after passing through the water sample, thereby calculating the light transmittance of the water sample. By monitoring the light transmittance, the PLC controller 18 can evaluate the water treatment effect and adjust the amount of hydrogen peroxide added or the UV radiation intensity to optimize the oxidation process. The fifth sensor 8 is an ultraviolet sensor used to detect the intensity of ultraviolet light transmitted through the water being oxidized in a UV / H2O2 oxidation device. The fifth sensor 8 can operate based on photovoltaic mode or photoconductive mode, converting ultraviolet signals into electrical signals. It can use GaN-based materials or ZnS materials, which have high sensitivity and selectivity to ultraviolet light.

[0057] In some embodiments, in order to accurately monitor the flow rate of the fluid in the system, multiple flow meters can be installed in the transmission path of the coupling system in this embodiment to achieve further fine control over the flow rate, hydrogen peroxide concentration, and empty bed contact time of the bioactive device.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit the application in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the protection scope of this application.

Claims

1. A water treatment system based on UV / H2O2 oxidation and bioporous media coupling, characterized in that, include: The UV / H2O2 oxidation device adds hydrogen peroxide to the water to be treated and generates a first treatment stream by ultraviolet irradiation. A bioactive device includes a bioreactor chamber and a first porous media bed and a second porous media bed filled in the bioreactor chamber. The bioreactor chamber receives a first processing stream and outputs a second processing stream processed by the first porous media bed and the second porous media bed. The first porous media bed and the second porous media bed are distributed sequentially along the flow direction of the first processing stream. A biofilm is attached to the porous media surface of the second porous media bed.

2. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The UV / H2O2 oxidation device includes a hydrogen peroxide dosing unit and an ultraviolet irradiation unit. The hydrogen peroxide dosing unit has a hydrogen peroxide storage container. Hydrogen peroxide is added to the hydrogen peroxide storage container and mixed with the water to be treated to form a pretreatment stream. The ultraviolet irradiation unit receives the pretreatment stream and oxidizes and degrades it with ultraviolet light to generate a first treatment stream.

3. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 2, characterized in that, The hydrogen peroxide dosing unit also includes a flow control device, the input of which is fluidly connected to the liquid storage container, and the output of which is fluidly connected to the water body to be treated.

4. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 2, characterized in that, The hydrogen peroxide dosing unit also includes a mixing device that receives the water to be treated and hydrogen peroxide and mixes them to generate the pretreatment stream.

5. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 2, characterized in that, The ultraviolet irradiation unit includes an ultraviolet radiation source and an oxidation reaction chamber. The ultraviolet radiation source is disposed in the oxidation reaction chamber. The oxidation reaction chamber receives the preprocessing stream and outputs a first processing stream generated by the ultraviolet radiation source.

6. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The porous medium in the first porous media bed is activated carbon that has been softened by acid washing.

7. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The porous medium in the second porous media bed is bio-activated carbon.

8. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The bioactive device further includes an aeration mechanism, which is disposed upstream of the first porous media bed along the flow direction of the first processing flow, and the aeration mechanism injects air toward the first porous media bed.

9. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The bioactive device further includes a water distribution plate rotatably connected to the bioreaction chamber, the water distribution plate being disposed upstream of the first porous media bed along the flow direction of the first processing flow.

10. The water treatment system based on UV / H2O2 oxidation and bioporous media coupling according to claim 1, characterized in that, The water treatment system further includes a control unit for controlling the amount of hydrogen peroxide added and the intensity of ultraviolet irradiation in the UV / H2O2 oxidation device, the control unit comprising: The first sensor detects water quality data of the water body to be treated. The second sensor detects data on toxic and harmful organic matter in the effluent from the bioactive device. The PLC controller receives data collected by the first and second sensors to control the amount of hydrogen peroxide added to the UV / H2O2 oxidation device.

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