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

Abstract

The invention discloses a water treatment method and system based on UV / H2O2 oxidation and biological porous medium coupling. According to the method and the system, hydrogen peroxide is added into a water body to be treated to form a first treatment flow containing hydrogen peroxide with a certain concentration, and the first treatment flow is subjected to ultraviolet irradiation to oxidize and degrade organic pollutants in the water, so that a second treatment flow with the content of the organic pollutants remarkably reduced is generated; and further adsorbing and degrading residual hydrogen peroxide in the second treatment flow and byproducts in the second treatment flow by using the biological porous medium bed attached with the biological membrane, thereby obtaining a treated water body with safer water quality. According to the method, the organic micropollutants are efficiently removed, meanwhile, H2O2 residues are avoided, effluent intermediate products are controllable, and the technical defects that in existing UV / H2O2 oxidation treatment, the organic micropollutants are not completely removed, and by-products are risky are overcome.

Description

Technical Field

[0001] The present invention relates to the field of water treatment technology, in particular to a method based on UV / H 2 O 2 A water treatment method and system combining oxidation and biological porous media coupling. Background Art

[0002] With the rapid development of the national economy, human activities have caused rivers to receive various organic micropollutants from agricultural, industrial and wastewater treatment sources. The concentration of these organic micropollutants in water bodies ranges from nanograms per liter (ng / L) to micrograms per liter (μg / L). Due to their high toxicity and difficulty in biodegradation, conventional treatment processes are difficult to effectively remove these organic micropollutants, which directly affects the operating efficiency of water plants and the safe supply of drinking water.

[0003] For the control of organic micropollutants in water, it is crucial to select advanced treatment technologies. Advanced oxidation processes (AOPs) that generate free radicals at room temperature and pressure to achieve effective water purification are generally considered to be effective technologies for degrading organic micropollutants in water. 2 O 2 The process is one of the most widely used advanced oxidation processes in water supply projects. 2 O 2 It is generally most commonly used to remove odor-causing substances in drinking water to solve seasonal sudden odor problems. It is also often used to remove other difficult-to-degrade organic micropollutants such as drugs, algal toxins, and disinfection by-product precursors.

[0004] However, UV / H 2 O 2 The technology also has some limitations. 2 O 2 The effluent from the process oxidation often faces hydrogen peroxide (H 2 O 2 ) residues and the generation of small molecular organic byproducts. Therefore, the development of a water supply deep treatment system with significant removal effect of organic micropollutants and controllable toxic byproducts is of great significance to ensure the safe supply of drinking water. Summary of the invention

[0005] In order to solve the existing UV / H 2 O 2 H in water treatment process 2 O 2 To solve the problem of residual and small molecule organic byproducts, the present application provides a UV / H 2 O 2 Oxidative water treatment method, which combines UV / H 2 O2 The oxidized water is further adsorbed and degraded by the porous medium material with attached microorganisms, which can effectively remove H 2 O 2 On the other hand, a system for implementing the water treatment method is also provided, which is 2 O 2 The post-oxidation device is equipped with a biological activity device, and by regulating H 2 O 2 The adaptation of dosage and UV intensity improves the decomposition and mineralization efficiency of organic pollutants in water bodies and reduces H 2 O 2 Residual and small molecule organic by-products.

[0006] In one aspect of the present application, a UV / H 2 O 2 A water treatment method coupled with oxidation and biological porous media, wherein hydrogen peroxide is added to a water body to be treated and mixed to obtain a first treatment flow; the first treatment flow is subjected to ultraviolet irradiation to produce a second treatment flow for oxidation degradation; a biological porous media bed is used to perform adsorption and degradation treatment on hydrogen peroxide residues and oxidation degradation byproducts in the second treatment flow; a biofilm is attached to the porous medium surface of the biological porous media bed, and the dominant bacterial flora of the biofilm includes: Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, Paracra urococcus, and the relative abundances of each bacterial genera were 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09%, and 0%-2.36%, respectively.

[0007] In one embodiment, the dominant bacterial groups in the biofilm include Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, and Haliscome nobacter, and the relative abundance of each genus is 12.09%, 8.75%, 6.66%, 5.73%, 4.62%, 3.07%, and 2.86%, respectively.

[0008] In one embodiment, the concentration of hydrogen peroxide in the first treatment stream is 5 to 20 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 200 to 800 mJ / cm 2 .

[0009] In one embodiment, the concentration of hydrogen peroxide in the first treatment stream is 10 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 400 mJ / cm 2 .

[0010] In one embodiment, the biofilm formation process is: 2 O 2 The effluent from the oxidation treatment is passed into the porous medium bed and continuously accumulates on the surface of the porous medium to form the biofilm.

[0011] In one embodiment, the average microbial concentration HPC of the biofilm is 6.1×10 8 ~8.9×10 8 CFU / g, NADH value is 84~119nM.

[0012] In one embodiment, the average microbial concentration HPC of the biofilm is 8.3×10 8 CFU / g, NADH value is 114nM.

[0013] In one embodiment, the content of the odor substances GSM and 2-MIB in the water to be treated is not less than 800 ng / L.

[0014] In one embodiment, the content of the odor substances GSM and 2-MIB in the water to be treated is 1000 ng / L.

[0015] In another aspect of the present application, a UV / H 2 O 2 Oxidation and biological porous media coupling system, including: hydrogen peroxide dosing unit, UV / H 2 O 2 The hydrogen peroxide dosing unit has a hydrogen peroxide storage container, and the storage container outputs hydrogen peroxide to mix with the water to be treated to form a first treatment flow; the UV / H 2 O 2The oxidation device receives the first treatment flow, and oxidizes and degrades the first treatment flow to produce a second treatment flow; the biological activity device has a biological porous medium bed, and a biological film is attached to the porous medium surface of the biological porous medium bed. The second treatment flow enters the biological activity device and is adsorbed and degraded by the biological porous medium bed to produce a third treatment flow; the dominant bacterial community of the biofilm includes: Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, Paracraurococcus, and the relative abundance of each genus is 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09% and 0%-2.36%, respectively.

[0016] In one embodiment, the dominant bacterial groups in the biofilm include Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, and Haliscome nobacter, and the relative abundance of each genus is 12.09%, 8.75%, 6.66%, 5.73%, 4.62%, 3.07%, and 2.86%, respectively.

[0017] In one embodiment, the concentration of hydrogen peroxide in the first treatment stream is 5 to 20 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 200 to 800 mJ / cm 2 .

[0018] In one embodiment, the concentration of hydrogen peroxide in the first treatment stream is 10 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 400 mJ / cm 2 .

[0019] In one embodiment, the biofilm formation process is: 2 O 2 The effluent from the oxidation treatment is passed into the porous medium bed and continuously accumulates on the surface of the porous medium to form a biofilm.

[0020] In one embodiment, the average microbial concentration HPC of the biofilm is 6.1×10 8 ~8.9×10 8 CFU / g, NADH value is 84~119nM.

[0021] In one embodiment, the average microbial concentration HPC of the biofilm is 8.3×10 8 CFU / g, NADH value is 114nM.

[0022] In one embodiment, the hydrogen peroxide dosing unit is provided with a pretreatment unit in the front stage, the pretreatment unit processes the water to be treated to generate a pretreatment flow, and the liquid storage container outputs hydrogen peroxide which mixes with the pretreatment flow to form a first treatment flow.

[0023] In one embodiment, the hydrogen peroxide dosing unit further comprises a flow control device, the input end of the flow control device is fluidically connected to the liquid storage container, and the output end of the flow control device is fluidically connected to the water body to be treated.

[0024] In one embodiment, the hydrogen peroxide dosing unit further includes a mixing device, which receives the water to be treated and hydrogen peroxide and mixes them to generate the first treatment flow.

[0025] In one embodiment, the UV / H 2 O 2 The oxidation device includes an ultraviolet radiation light source and an oxidation reaction chamber. The ultraviolet radiation light source is arranged in the oxidation reaction chamber and is used to provide ultraviolet radiation to the fluid passing through the oxidation reaction chamber. The oxidation reaction chamber receives the first treatment flow and outputs a second treatment flow after oxidation treatment.

[0026] In one embodiment, the bioactive device comprises a bioreaction chamber and the biological porous medium bed filled in the bioreaction chamber, wherein the bioreaction chamber has an inlet for receiving the second process flow and an outlet for outputting the third process flow.

[0027] In one embodiment, the inlet of the bioreactor chamber is located at the upper part of the bioporous medium bed, and the outlet of the bioreactor chamber is located at the lower part of the bioporous medium bed.

[0028] In one embodiment, the biofilm is a porous biomedia bed coupled with the UV / H 2 O 2 The effluent from the oxidation device is continuously generated by contact.

[0029] In one embodiment, the biological activity device further comprises an aeration mechanism for injecting gas into the biological porous medium bed, and the aeration mechanism is located in the biological reaction chamber at the bottom of the biological porous medium bed.

[0030] In one embodiment, the water treatment system also includes a control unit, which includes a first sensor, a second sensor and a PLC controller, wherein the first sensor detects water quality data of the water body to be treated, the second sensor detects data of toxic and harmful organic matter in the third treatment flow, and the PLC controller receives the data collected by the first sensor and the second sensor, and controls the amount of hydrogen peroxide added by the hydrogen peroxide addition unit.

[0031] In one embodiment, the control unit further comprises a third sensor, a fourth sensor and a fifth sensor; the third sensor detects the hydrogen peroxide concentration data in the first treatment flow and the second treatment flow, and transmits the hydrogen peroxide concentration data to the PLC controller; the fourth sensor detects the water quality transmittance data in the first treatment flow, and transmits the water quality transmittance data to the PLC controller; the fifth sensor detects the UV / H 2 O 2 The ultraviolet light intensity data of the oxidation device is received, and the ultraviolet light intensity data is transmitted to the PLC controller; the PLC controller receives the hydrogen peroxide concentration data to control the hydrogen peroxide dosage of the hydrogen peroxide dosing unit; the PLC controller receives the water quality transmittance data and the ultraviolet light intensity data to control the UV / H 2 O 2 UV intensity of the oxidation device.

[0032] The beneficial effects of this application are:

[0033] This application is achieved by UV / H 2 O 2 The oxidized water is treated by a biological porous media bed, which can effectively remove UV / H through adsorption and degradation. 2 O 2 The residual hydrogen peroxide and toxic intermediate byproducts in the oxidized water are removed. At the same time, a better water treatment effect is achieved by using a biological porous media bed and controlling the hydrogen peroxide and ultraviolet dosage. Experiments have shown that the water treatment method of this application has a TOC removal rate of 42% to 98%, UV / H 2 O 2 After treatment with biological activated carbon, the 409 organic substances in the effluent were reduced to 39, and the removal rate of oxidation by-products reached 90%.

[0034] At the same time, the water treatment system of this application realizes UV / H 2 O 2 During the oxidation process, H 2 O 2 Precise control of dosage and UV irradiation dose. This control strategy optimizes UV / H2 O 2 The treatment effect of the oxidation process significantly reduces the residual hydrogen peroxide and the content of small molecular organic pollutants in the treated water. In addition, the overall control of the combined water treatment system also improves the decomposition and mineralization efficiency of the target organic pollutants, allowing the entire water treatment system to reduce the use of chemicals, reduce energy consumption, and reduce operating costs while maintaining high-efficiency water purification performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the water purification coupling system of the present application;

[0036] In the figure: 1. liquid storage container, 2. flow control device, 3. mixing device, 4. third sensor, 5. fourth sensor, 6. quartz tube, 7. UV lamp, 8. fifth sensor, 9. oxidation reaction tank, 10. aeration mechanism, 11. biological reaction chamber, 12. second sensor, 13. PLC controller, 14. first sensor, 15. flow meter. DETAILED DESCRIPTION

[0037] The present application is described in detail below. Although 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 by the embodiments described herein. On the contrary, 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.

[0038] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the functional differences of components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of the present application shall be determined by the attached claims.

[0039] UV / H 2 O 2 As an oxidation process (AOP), the process is widely used in water treatment to remove organic pollutants, especially in removing odor-causing substances and other difficult-to-degrade organic micropollutants in drinking water. However, this technology does have some limitations and problems in practical applications, mainly due to the fact that UV / H 2 O 2The effluent from the process contains hydrogen peroxide (H 2 O 2 ) Residue problems and possible small molecule organic by-products.

[0040] UV / H 2 O 2 The working principle of the process is to use ultraviolet (UV) radiation to catalyze the decomposition of hydrogen peroxide, producing hydroxyl radicals (·OH) with strong oxidizing properties. These free radicals can efficiently oxidize and degrade organic pollutants in water. However, if the UV radiation intensity is insufficient, the reaction time is insufficient, or the system design is improper, some hydrogen peroxide may not be completely decomposed and remain in the treated water. However, excessive UV radiation intensity will lead to an increase in by-products. 2 O 2 Although the direct harm to human health is relatively small, excessive residual amount may affect the taste and smell of water. At the same time, during the subsequent pipeline transportation and storage process, the residual H 2 O 2 It may continue to decompose, produce oxygen and water, change the physical and chemical properties of water, and even promote the growth of microorganisms under certain conditions, affecting water quality safety.

[0041] And, in UV / H 2 O 2 During the oxidation process, although most organic pollutants can be effectively degraded, some organic matter (especially those with complex structures or containing specific functional groups) may not be completely degraded during the oxidation process, but converted into small molecular weight organic byproducts. These byproducts may include aldehydes, ketones, carboxylic acids, etc. Some byproducts may be toxic or bioaccumulative. For example, dissolved organic matter (DOM) will react with active chlorine species to form disinfection byproducts (DBPs) during UV / chlorine (amine) advanced treatment, posing a potential threat to the environment and human health. In addition, UV / H 2 O 2 The system may also produce some inorganic by-products through photochemical reactions, such as nitrates, nitrites, etc. The excessive presence of these inorganic substances is also not conducive to water quality safety.

[0042] In order to minimize the amount of hydrogen peroxide (H 2 O 2 ) residues and generate small molecule organic byproducts. This application aims to make full use of UV / H 2 O 2 To this end, UV / H 2 O 2The biological activity device is integrated downstream of the oxidation device and equipped with an external control unit to form a comprehensive water treatment system. On the one hand, the biological activity device is responsible for the adsorption and removal of UV / H 2 O 2 The residual H in the water after oxidation treatment 2 O 2 , and degrade UV / H 2 O 2 The toxic small molecule organic byproducts produced during the oxidation stage; on the other hand, the control unit precisely regulates the UV / H 2 O 2 During the oxidation process, H 2 O 2 The dosage and UV dose are to ensure H 2 O 2 The system works effectively with ultraviolet rays to reduce the residues and intermediate by-products in the treated water. Through this comprehensive design, the system achieves efficient and environmentally friendly water purification.

[0043] In one embodiment of the present application, a UV / H 2 O 2 The water treatment method coupled with oxidation and biological porous media comprises the following steps:

[0044] S1: adding hydrogen peroxide to the water body to be treated and mixing to obtain a first treatment flow;

[0045] S2: subjecting the first treatment stream to ultraviolet irradiation to generate a second treatment stream subjected to oxidative degradation;

[0046] S3 uses a biological porous media bed to adsorb and degrade the residual hydrogen peroxide and oxidative degradation by-products in the second treatment flow.

[0047] The water body to be treated in this application refers to a water body that is polluted by organic matter and some 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 synthetic organic matter (SOC), water bodies containing endocrine disrupting substances, water bodies containing disinfection by-product precursors, water bodies containing biodegradable organic matter, and water bodies containing sulfur-containing organic micropollutants.

[0048] In the present 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 pungent odor, it is not conducive to direct addition. Generally, an aqueous solution of hydrogen peroxide is more common, and its concentration can be configured according to actual processing requirements.

[0049] In this application, the treatment stream refers to the fluid formed after the 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 a specific treatment step, which contains pollutants in the raw water, added chemical oxidants (such as hydrogen peroxide), and by-products produced by the oxidation reaction. For example, the first treatment stream contains pollutants in the raw water, newly added hydrogen peroxide, and possible oxidation by-products; the second treatment stream contains water that has undergone preliminary oxidation treatment, as well as new oxidation by-products produced.

[0050] In the present application, the biological porous media bed is formed by attaching a biofilm on the porous media surface of the porous media bed. The porous media bed can be made of a variety of materials, such as ceramics, metals, plastics or activated carbon, and its structure can be a particle stacking bed, a honeycomb plate, a wire mesh, a foam ceramic, etc., preferably an activated carbon particle stacking bed. The preparation of activated carbon can start from a variety of carbonaceous raw materials, such as wood, coconut shells, coal, bamboo, husks, etc., and activated carbon powder or particles are added with an appropriate amount of binder, such as starch, jute gum, polymers, etc., so that it can maintain a certain shape and strength during the preparation process. These materials are filled into a preparation mold, and after forming, drying and burning, a porous media bed with a porous structure is finally formed.

[0051] The oxidative degradation by-products of this application are mainly organic lipids, organic aldehydes, ketones, organic phenols, etc., and also mainly include pesticides, drugs, disinfection by-products, etc. Further analysis found that the oxidative by-products also contain the conventional indicator disinfection by-product chloroform, the extended indicator atrazine, and the reference indicator dibutyl phthalate required by the control requirements of the drinking water hygiene standard "GB5749-2022".

[0052] In certain embodiments, the dominant bacterial communities in the biofilm include Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, and Paracraurococcus, and the relative abundance of each genus is 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09%, and 0%-2.36%, respectively. Preferably, the dominant bacterial groups in the biofilm include Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, and Haliscomenobacter, and the relative abundance of each genus is 12.09%, 8.75%, 6.66%, 5.73%, 4.62%, 3.07%, and 2.86%, respectively.For example, the relative abundance of Belnapia can be 11.20%, 11.42%, 11.64%, 11.86%, 12.10%, 12.33%, 12.56%, 12.88%, 13.02%, 13.46%; the relative abundance of Sphingomonas can be 7.05%, 7.35%, 7.56%, 7.81%, 8.43%, 8.78%, 9.02%, 9.43%, 9.83%, 10.07%, 10.24%; the relative abundance of Gemmata can be 5.89%, 6.36%, 6.66%, 6.93%, 7.34%, 7. The relative abundance of Methyloversatilis can be 4.76%, 4.79%, 4.84%, 4.97%, 5.12%, 5.34%, 5.67%, 5.89%, 6.10%, 6.45%, 6.65%, 6.68%; the relative abundance of Sphingobium can be 0%, 0.04%, 0.17%, 0.31%, 0.54%, 0.98%, 1.23%, 1.67%, 2.01%, 2.45%, 2.98%, 3.32%, 3.76%, 4.10%, 4. .55%, 4.98%, 5.17%; the relative abundance of Bradyrhizobium can be 2.87%, 2.93%, 2.98%, 3.03%, 3.08%, 3.13%, 3.18%, 3.23%, 3.28%, 3.33%, 3.38%, 3.43%, 3.48%, 3.53%, 4.11%; the relative abundance of Haliscomenobacter can be 0%, 0.06%, 0.22%, 0.49%, 0.65%, 0.96%, 1.35%, 1.67%, 1.98%, 2.29%, 2.64%, 2.99% , 2.28%, 3.52%, and 3.73%; the relative abundance of Methylobacterium can be 0.00%, 0.14%, 0.29%, 0.43%, 0.58%, 0.72%, 0.87%, 1.01%, 1.16%, 1.31%, 1.45%, 1.60%, 1.74%, 1.89%, 2.04%, and 2.09%; the relative abundance of Paracraurococcus can be 0.00%, 0.22%, 0.45%, 0.67%, 0.90%, 1.22%, 1.65%, 1.97%, 2.20%, and 2.36%.

[0053] In the present application, relative abundance refers to the percentage of each genus in the total number of the entire bacterial community, that is, the proportion of each genus in the entire biofilm bacterial community. Taking Belnapia as an example, the number of the genus Belnapia accounts for 11.20% to 13.46% of the total biofilm bacterial community; preferably, the number of the genus Belnapia accounts for 12.09% of the total biofilm bacterial community.

[0054] Among them, Belnapia is a genus belonging to the Acetobacteraceae family and the Alphaproteobacteria class. Members of the genus Belnapia are typically Gram-negative, aerobic, non-motile, non-spore-forming, cocciform bacteria that can exhibit pink or red pigmentation and can be isolated from a variety of soil samples, including desert biocrusts, forest soils, and grassland soils. Sphingomonas is a genus of Gram-negative, non-photosynthetic, strictly aerobic bacteria that are widely distributed in a variety of oligotrophic environments, such as temperate and polar soils, marine sediments, and plant tissues as endophytes. They have also been found in unpolluted environments, such as agricultural soils, marine environments, and water distribution systems. Bacteria of the genus Sphingomonas usually do not produce spores, are rod-shaped, and can reproduce by binary fission, budding, or polar growth. These bacteria can be motile (using polar / subpolar single flagella) or non-motile and usually have yellow-pigmented colonies. They have glycosphingolipids (GSLs) such as glycosphingosine (SGL-1) and 2-hydroxymyristic acid (no 3-hydroxy acid) in the outer cell membrane instead of lipopolysaccharide (LPS), which is a clear difference between Sphingomonas and other members of the α-Proteobacteria subclass. Gemmata is a genus in the phylum Planctomycetes. Gemmata bacteria are aerobic chemoheterotrophs that reproduce by budding. They lack peptidoglycan in their cell walls and have crateriform structures (i.e., circular pits) on the cell surface. They are mainly found in aquatic and soil environments, but have also been found in hospital water networks, animals, human skin, intestinal microbiota, and the blood of patients with aplastic anemia. Methyloversatilis belongs to the Rhodocyclaceae family under the phylum Proteobacteria. The bacteria in this genus are Gram-negative bacteria. The cell morphology is usually rod-shaped, without spores, non-motile or minimally motile. They reproduce by binary fission. They can use methanol, methylamine, and a variety of multi-carbon compounds as carbon and energy sources for growth. Sphingobium belongs to the class Alphaproteobacteria under the phylum Proteobacteria. The bacteria of this genus are Gram-negative bacteria. The cells are rod-shaped, strictly aerobic, non-spore-forming, non-motile or very rarely motile. The colony morphology varies depending on the species, but is usually yellow, round, and has a smooth surface.Bradyrhizobium belongs to the Bradyrhizobiaceae family, a genus under the Proteobacteria. The bacteria in this genus are Gram-negative bacteria. The cells are usually rod-shaped, motile with flagella, chemoheterotrophic, and facultatively aerobic. They can form a symbiotic relationship with leguminous plants and provide nitrogen nutrition to plants through nitrogen fixation. Haliscomenobacter belongs to the Micrococcineae subfamily of Actinobacteria. It is a Gram-positive bacterium with a rod-shaped or spherical shape, and the specific morphological characteristics depend on the specific species. Methylobacterium belongs to the Rhodocyclaceae family under the Proteobacteria. The bacteria in this genus are Gram-negative bacteria. The cells are diverse in morphology, including rod-shaped, spherical or irregular shapes. The cells often contain large Sudanophilic granules and sometimes metachromatic granules. Representative strains have the multilayer cell wall structure and citrate synthesis characteristics of Gram-negative cells. Paracraurococcus belongs to the class Alphaproteobacteria under the phylum Proteobacteria, and is further classified into the orders Rhodospirillales and the family Acetobacteraceae. The bacteria of this genus are Gram-negative bacteria. The cells are non-motile cocci with a diameter usually between 0.8 and 1.5 microns. On solid culture media, these bacteria grow heterotrophically under aerobic conditions to form red colonies.

[0055] Among them, the ability of dominant bacterial genera to metabolize organic matter is in the following order: Belnapia, Sphingomonas>Bradyrhizobium, Sphingobium>Gemmata>Methyloversatilis>Haliscomenobacter>Methylobacterium>Paracraurococcus.

[0056] In some embodiments, the water body to be treated may be a pretreated water body. When the water body to be treated does not meet the water inlet conditions, the water inlet is obtained by pretreatment methods such as biological pre-oxidation, coagulation sedimentation flotation, and sand filtration in sequence. Among them, biological pre-oxidation is a method of removing or transforming pollutants in water by using the metabolism of microorganisms. In this process, microorganisms are introduced into the water body to be treated. They decompose organic pollutants through metabolic processes and convert them into harmless substances such as carbon dioxide and water. This method can improve the biodegradability of water quality and lay 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 to form larger floccules with suspended matter in the water. Subsequently, these floccules are separated from the water by precipitation, thereby purifying the water quality. Sand filtration is a filtration technology that uses sand layers as filter media to remove suspended matter, microorganisms and some organic pollutants in water. When the water to be treated passes through the sand layer, larger particles are intercepted, while smaller particles and soluble pollutants are filtered out through the pore structure of the sand layer. Sand filtration can effectively remove turbidity and microorganisms in water and improve water quality.

[0057] In some embodiments, the condition of the water body to be treated in which hydrogen peroxide is added is UVT>80%, preferably UVT>85%, for example, UVT>81%, UVT>82%, UVT>83%, UVT>84%, UVT>85%, UVT>86%, UVT>87%, UVT>88%, UVT>89%, UVT>90%, UVT>91%, UVT>92%, UVT>93%, UVT>94%, UVT>95%, etc.

[0058] In some embodiments, the concentration of hydrogen peroxide in the first treatment flow is 5 to 20 mg / L, preferably, the concentration of hydrogen peroxide is 8 to 15 mg / L, and more preferably, the concentration of hydrogen peroxide is 10 mg / L. For example, the concentration of hydrogen peroxide can be 5 mg / L, 6 mg / L, 7 mg / L, 8 mg / L, 9 mg / L, 10 mg / L, 11 mg / L, 12 mg / L, 13 mg / L, 14 mg / L, 15 mg / L, 16 mg / L, 17 mg / L, 18 mg / L, 19 mg / L, 20 mg / L. When the concentration range of hydrogen peroxide is within this range, organic pollutants in water can be efficiently oxidized and degraded, and the residual hydrogen peroxide in the second treatment flow can be reduced.

[0059] In some embodiments, the UV intensity of the UV irradiation on the first treatment stream is 200-800 mJ / cm 2 , preferably 300 to 600 mJ / cm 2, more preferably 400 mJ / cm 2 . For example, it can be 200mJ / cm 2 、250mJ / cm 2 、300mJ / cm 2 、350mJ / cm 2 、400mJ / cm 2 、450mJ / cm 2 、500mJ / cm 2 、550mJ / cm 2 、600mJ / cm 2 、650mJ / cm 2 、700mJ / cm 2 、750mJ / cm 2 、800mJ / cm 2 etc. Ultraviolet radiation within this range can fully catalyze the decomposition of hydrogen peroxide, produce hydroxyl radicals (·OH) with strong oxidizing properties, and effectively decompose organic pollutants in water.

[0060] In some embodiments, the amount of hydrogen peroxide and the intensity of ultraviolet light of ultraviolet irradiation are used in coordination. When the concentration of hydrogen peroxide is 5 to 20 mg / L, the intensity of ultraviolet light is 200 to 800 mJ / cm 2 Preferably, when the hydrogen peroxide concentration is 8 to 15 mg / L, the UV intensity is 300 to 600 mJ / cm 2 More preferably, when the hydrogen peroxide concentration is 10 mg / L, the UV intensity is 400 mJ / cm 2 For example, it can be 5mg / L, 200mJ / cm 2 ; 6mg / L, 250mJ / cm 2 ; 7mg / L, 300mJ / cm 2 ; 8mg / L, 350mJ / cm 2 ; 10mg / L, 400mJ / cm 2 ; 12mg / L, 450mJ / cm 2 ; 13mg / L, 500mJ / cm 2 ; 14mg / L, 550mJ / cm 2 ; 15mg / L, 600mJ / cm 2 ; 16mg / L, 650mJ / cm 2 ; 18mg, 700mJ / cm 2 ; 19mg / L, 750mJ / cm 2 ; 20mg / L, 800mJ / cm 2 .

[0061] The biofilm of the present application is to be subjected to UV / H 2O 2 The effluent from the oxidation treatment is passed into the porous medium bed and continuously accumulates on the surface of the porous medium to form a biofilm. Microorganisms attach to the surface of the porous medium through structures such as flagella and cilia on their surface and begin to secrete extracellular polymers (EPS). Microorganisms enhance adhesion to the porous medium through the secreted extracellular polymers (EPS), forming irreversible adhesion. Microorganisms attached to the surface of the porous medium begin to divide and form small colonies, which gradually increase and cover the surface of the porous medium to form a mature biofilm.

[0062] In certain embodiments, the biofilm formation process comprises the following steps:

[0063] S1: adding hydrogen peroxide to the first water body, and subjecting the water body to ultraviolet irradiation, oxidation and degradation to obtain a treated water body;

[0064] S2 passes the treated water into a porous medium bed for acclimatization, and continuously accumulates on the surface of the porous medium to form a biofilm;

[0065] After the initial formation of S3 biofilm, the bacterial species of the biofilm were detected at irregular intervals. When the dominant bacterial species were Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, and Paracraurococcus, and the relative abundance of each genus was 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09%, and 0%-2.36%, respectively, the domestication was stopped to obtain the target biofilm.

[0066] In order to form a biofilm of the target bacterial community and control the abundance range of each bacterial genus, the concentration of hydrogen peroxide in the first water body after addition is 5-20 mg / L, and the ultraviolet light intensity of ultraviolet irradiation is 200-800 mJ / cm 2 . Preferably, the concentration of hydrogen peroxide is 8 to 15 mg / L, and more preferably, the concentration of hydrogen peroxide is 10 mg / L. For example, the concentration of hydrogen peroxide can be 5 mg / L, 6 mg / L, 7 mg / L, 8 mg / L, 9 mg / L, 10 mg / L, 11 mg / L, 12 mg / L, 13 mg / L, 14 mg / L, 15 mg / L, 16 mg / L, 17 mg / L, 18 mg / L, 19 mg / L, 20 mg / L. Preferably, the ultraviolet light intensity is 300 to 600 mJ / cm 2 , more preferably 400 mJ / cm 2. For example, it can be 200mJ / cm 2 、250mJ / cm 2 、300mJ / cm 2 、350mJ / cm 2 、400mJ / cm 2 、450mJ / cm 2 、500mJ / cm 2 、550mJ / cm 2 、600mJ / cm 2 、650mJ / cm 2 、700mJ / cm 2 、750mJ / cm 2 、800mJ / cm 2 Etc. The first water body can be a water body to be treated or other water bodies, and the UVT of the first water body is > 80%. Preferably, UVT > 85%, for example, UVT > 81%, UVT > 82%, UVT > 83%, UVT > 84%, UVT > 85%, UVT > 86%, UVT > 87%, UVT > 88%, UVT > 89%, UVT > 90%, UVT > 91%, UVT > 92%, UVT > 93%, UVT > 94%, UVT > 95%, etc. Preferably, the water quality of the first water body is: turbidity 0.23NTU, UVT 91.3%, TOC 2.89mg / L, carbonate content 128mg / L.

[0067] In certain embodiments, the average microbial concentration HPC of the biofilm is 6.1×10 8 ~8.9×10 8 CFU / g, NADH value is 84-119nM. Preferably, the average microbial concentration HPC is 8.3×10 8 CFU / g, NADH value is 114nM. For example, the average microbial concentration HPC is 6.1×10 8 CFU / g, 6.2×10 8 CFU / g, 6.3×10 8 CFU / g, 6.4×10 8 CFU / g, 6.5×10 8 CFU / g, 6.6×10 8 CFU / g, 6.7×10 8 CFU / g, 6.8×10 8 CFU / g, 6.9×10 8 CFU / g, 7.0×10 8 CFU / g, 7.1×10 8 CFU / g, 7.2×10 8CFU / g, 7.3×10 8 CFU / g, 7.4×10 8 CFU / g, 7.5×10 8 CFU / g, 7.6×10 8 CFU / g, 7.7×10 8 CFU / g, 7.8×10 8 CFU / g, 7.9×10 8 CFU / g, 8.0×10 8 CFU / g, 8.1×10 8 CFU / g, 8.2×10 8 CFU / g, 8.3×10 8 CFU / g, 8.4×10 8 CFU / g, 8.5×10 8 CFU / g, 8.6×10 8 CFU / g, 8.7×10 8 CFU / g, 8.8×10 8 CFU / g, 8.9×10 8 CFU / g; NADH values ​​are 84nM, 86nM, 88nM, 90nM, 92nM, 94nM, 96nM, 98nM, 100nM, 102nM, 104nM, 106nM, 108nM, 110nM, 112nM, 114nM, 116nM, and 118nM.

[0068] In another embodiment of the present application, a UV / H 2 O 2 Oxidation and biological porous media coupling system. The system includes a hydrogen peroxide dosing unit, a UV / H 2 O 2 Oxidation device, biological activity device and control unit. Among them, the hydrogen peroxide dosing unit adds hydrogen peroxide to the water body to be treated to form a first treatment flow; UV / H 2 O 2 The oxidation device fluid is connected to the next stage of the hydrogen peroxide dosing unit, and the first treatment flow passes through the UV / H 2 O 2 The oxidation device oxidizes to produce a second treatment stream; the biological activity device fluid is connected to the UV / H 2 O 2 After the oxidation device, the second treatment stream is subjected to adsorptive degradation in the biological activity device to produce a third treatment stream.

[0069] It can be understood that the fluid delivery method of the present application is generally pipeline delivery, but it is not limited to this. All delivery methods that can deliver liquid fluids are applicable here.

[0070] The hydrogen peroxide dosing unit of the present application is used to add hydrogen peroxide to the water body to be treated at a controlled flow rate and flow rate to form a first treatment flow. The hydrogen peroxide dosing unit is a device for accurately adding a specific chemical substance (such as hydrogen peroxide) to a target water body, and usually includes a storage container, a mixing box (with an agitator), a metering pump, a liquid level meter, an electric control cabinet, a pipeline, a valve, a safety valve, a check valve, a pressure gauge, a filter, a base, etc., and can be configured according to the actual requirements of the user.

[0071] In some embodiments, the hydrogen peroxide dosing unit includes a liquid storage container and a flow control device, the liquid storage container is used to store hydrogen peroxide or its solution, the liquid storage container and the inlet end of the flow control device are fluidly connected, the outlet end of the flow control device is fluidly connected to the water inlet pipeline of the water body to be treated, and the flow control device extracts hydrogen peroxide or its solution from the liquid storage container and transports it to the water inlet of the water body to be treated to achieve the purpose of dosing. It can be understood that the liquid storage container 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 the chemical reaction between the material and hydrogen peroxide; and because hydrogen peroxide is easily decomposed into oxygen and water when heated, exposed to light or encountering certain impurities, the liquid storage container should be designed with sun protection measures, such as a sunshade and rainproof roof, to prevent long-term exposure to sunlight or high temperature environment from reducing the stability of hydrogen peroxide; at the same time, the liquid storage container should reserve a certain margin to adapt to the volume change that may occur in hydrogen peroxide at different temperatures; in addition, the liquid storage container should have a pressure relief valve or an exhaust port to ensure that the pressure can be quickly released when hydrogen peroxide decomposes to prevent explosion. The flow control device is used to accurately control the dosage of hydrogen peroxide, and has a fluid inlet and a fluid outlet, wherein the fluid inlet is connected to the liquid storage container, and the fluid outlet is connected to the transport pipeline of the water body to be treated. Generally speaking, the flow control device selects 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 and pollutant concentration of the water body.

[0072] In certain embodiments, in order to achieve uniform mixing of hydrogen peroxide and organic micro-polluted water, the hydrogen peroxide dosing unit is further configured with a mixing device, which receives and mixes the water to be treated and the hydrogen peroxide output by the flow control device to produce a first treatment flow. In the mixing device, the water to be treated and hydrogen peroxide or its solution are introduced and fully mixed to ensure that hydrogen peroxide is evenly dispersed in the water body, thereby improving the treatment efficiency. It is understandable that the mixing device has an inlet and an outlet, the inlet of the mixing device is connected to the outlet of the flow control device and the delivery pipeline of the water to be treated, and the hydrogen peroxide and the water to be treated are evenly mixed through the mixing device, and the mixed fluid is output from the outlet of the mixing device, that is, the first treatment flow. Or the mixing device has an inlet of the water to be treated, a hydrogen peroxide inlet and an outlet, the inlet of the water to be treated is connected to the delivery pipeline of the water to be treated, the hydrogen peroxide inlet is connected to the outlet of the flow control device, the hydrogen peroxide and the water to be treated are evenly mixed through the mixing device, and the mixed fluid is output from the outlet of the mixing device, that is, the first treatment flow.

[0073] Wherein, the mixing device can be a static mixer, a dynamic mixer or any other device that can effectively promote the mixing of organic micro-polluted water and hydrogen peroxide. Preferably, the mixing device is a static mixer, and specifically, the mixing process of the static mixer is carried out by a mixing unit composed of a series of different types of plate elements installed in a hollow pipe. Due to the effect of the mixing unit, the fluid is sometimes left-handed and sometimes right-handed, and the flow mixing direction is constantly changed, not only the central fluid is pushed to the periphery, but also the peripheral fluid is pushed to the center, thereby causing a good radial mixing effect. At the same time, the rotation of the fluid itself also occurs on the interface of the adjacent component connection, and this perfect radial circulation mixing effect enables the material to obtain the purpose of uniform mixing.

[0074] UV / H for this application 2 O 2 The oxidation device uses ultraviolet light (UV) and hydrogen peroxide (H 2 O 2 ) technology for water treatment. The first treatment flow produced by the hydrogen peroxide dosing unit enters the UV / H 2 O 2 The oxidation device generates hydroxyl radicals (·OH) with high oxidative activity by ultraviolet irradiation of hydrogen peroxide in the first treatment flow. These free radicals can non-selectively oxidize and degrade organic pollutants in the water to be treated. The organic pollutants are degraded into carbon dioxide, water and other mineral salts, including refractory organic matter, thereby achieving water purification. UV / H 2 O 2 The oxidation device comprises at least an ultraviolet radiation light source and a reaction chamber, wherein the ultraviolet radiation light source is arranged in a cavity of the reaction chamber to provide ultraviolet radiation to a first process flow passing through the reaction chamber.

[0075] In some embodiments, the ultraviolet radiation light source can be a low-pressure, low-pressure high-intensity or medium-pressure UV lamp tube. Preferably, the UV lamp tube can be a low-pressure mercury lamp with a wavelength of 254 nanometers. This lamp tube has a large digestion coefficient under common ultraviolet light waves, can produce more hydroxyl free radicals, and has good oxidation performance. At the same time, in order to improve the radiation effect, the installation angle of the UV lamp tube is between 15° and 30°. The reaction chamber can be a pipeline structure, which has the advantage of small head loss; a plurality of ultraviolet lamp tubes can be provided, and these lamp tubes are distributed in a circle along the axis in the reaction chamber, and a quartz tube is provided on the outside to protect the lamp tube and improve the light transmittance; the inner corner of the reaction chamber can be an arc shape, or a 45° baffle can be provided to reduce the dead water area and the low light intensity area and improve the oxidation efficiency. Preferably, the ultraviolet radiation light source includes a UV lamp tube and a quartz tube, the UV lamp tube is coaxially sleeved in the quartz tube, and the quartz tube is fixed to the UV / H 2 O 2 In the chamber of the oxidation device, the first treatment flow enters the UV / H 2 O 2 The second processing flow is formed by flowing around the quartz tube and along the axial extension direction of the quartz tube in the chamber of the oxidation device, and the second processing flow enters the next-level processing process.

[0076] The bioactive device of the present application is used as UV / H 2 O 2 The next treatment process of the oxidation device is equipped with a porous media bed with a biofilm attached to the surface. The second treatment flow is introduced into the biological activity device. The fluid passes through the porous media bed. During the first few minutes of empty bed contact time, the porous media bed removes the residual H in the second treatment flow. 2 O 2 , the biofilm then degrades the organic pollutants in the first treatment stream into carbon dioxide, water and biomass, thereby purifying the water and producing a third treatment stream for further treatment or use.

[0077] In certain embodiments, the biofilm is a porous media bed that is exposed to UV / H 2 O 2 During the contact process of the oxidized water, the bacterial accumulation continues to reach a stable state, that is, the transition from porous medium to biological porous medium is completed, and a biofilm with a stable structure is formed. It can be understood that the UV / H 2 O 2 The oxidation can be connected to the previous oxidation unit of the biological activity device, or it can be another separate UV / H 2 O 2Oxidation unit. Microorganisms in biofilms can obtain energy through their metabolic activities, such as photosynthesis or oxidative degradation of organic matter, while producing new cellular substances to maintain the growth and repair of biofilms. The formation process of biofilms is a complex dynamic process involving multiple physiological mechanisms and is affected by multiple factors. The formation process of biofilms can be divided into several stages, including initial cell adhesion, secretion of extracellular polymers (EPS) to enhance adhesion, micro-colony formation, maturation and differentiation of biofilm structure, and cell detachment and escape. In these stages, microbial cells use a series of extracellular appendages such as flagella, cilia, pili and extracellular membrane proteins to sense the presence of non-biological material surfaces or biological organism surfaces and adhere to them.

[0078] In certain embodiments, the bioactive device includes a bioreactor chamber and a porous media bed disposed in the bioreactor chamber, the porous media bed is designed to radially fill the bioreactor chamber, that is, the porous media bed is spread over the conveying path of the second processing flow, and the porous media surface of the porous media bed has a biofilm with a stable structure. The pore size and porosity of the porous media can be adjusted as needed to optimize the growth environment of the biofilm and the mass transfer efficiency of the bioreactor. Among them, the porous media bed can be made of a variety of materials, such as ceramics, metals, plastics or activated carbon, and its structure can be a particle stacking bed, a honeycomb plate, a metal wire mesh, a foam ceramic, etc., preferably an activated carbon particle stacking bed. The preparation of activated carbon can start from a variety of carbonaceous raw materials, such as wood, coconut shells, coal, bamboo, husks, etc., and the activated carbon powder or particles are added with an appropriate amount of binder, such as starch, jute gum, polymers, etc., so that it can maintain a certain shape and strength during the preparation process. These materials are filled into the preparation mold, and after molding, drying and sintering, a porous media bed with a porous structure is finally formed.

[0079] In some embodiments, in order to enhance the filtering effect and support the porous media bed, a supporting layer can be set in the bioreactor chamber to prevent the loss of the porous media and ensure the uniformity of water distribution during backwashing. The supporting layer is usually located at the bottom of the bioreactor chamber, and the upper part is a porous media bed, such as an activated carbon layer or other biofilm carrier, which forms a porous media bed by stacking. The supporting layer can select other types of filter materials, such as ceramsite, quartz sand, pebbles, etc., to improve the stability and filtering effect of the filter tank. In some designs, the supporting layer can also be used as a part of the bioreactor chamber, by attaching biofilms on ceramsite, quartz sand or pebbles, to increase the biological treatment capacity. The supporting layer can also be used in combination with other types of supporting materials, such as plastic modules or fiberglass, etc., to adapt to different process requirements and improve the performance of the filter tank.

[0080] The bioreactor chamber of the present application is a container that contains a biological porous media bed, and is generally designed to provide a suitable environment, such as temperature, humidity, and light, to promote the growth and metabolic activity of microorganisms. The bioreactor chamber can be airtight or translucent to allow light to penetrate and promote the growth of photosynthetic microorganisms. The size and shape of the bioreactor chamber can be optimized according to the processing requirements, for example, it can be designed to be a cuboid or cylindrical to maximize the biofilm attachment area in the chamber.

[0081] In some embodiments, the biological activity device also includes an aeration mechanism for injecting air into the biological porous media bed. The aeration mechanism is configured in the bioreactor chamber and is located at the bottom of the biological porous media bed or the supporting layer. In the biological activity device, the aeration mechanism plays a vital role. It not only enhances the filtering effect, but also provides the necessary oxygen for the biofilm in the porous media layer, thereby supporting the metabolic activities of the microorganisms. Generally speaking, the aeration mechanism includes an aerator, an air distribution pipeline and a gas supply system. The aerator is located at the bottom of the biological porous media bed or the supporting layer in the bioreactor chamber. The gas supply system is arranged outside the biological activity device, and the aerator is connected to the gas supply system through an air distribution pipeline. Among them, the aerator can be in various forms such as disc type, tube type, swirl type, jet type, etc.; the gas supply system includes a fan or air compressor, an air filter, etc., which are used to provide the gas source required for aeration and purify the gas.

[0082] In some embodiments, the water treatment system further includes a control unit, which includes a PLC controller, a first sensor for detecting the water quality of the water body to be treated, and a second sensor for detecting toxic and harmful substances in the third treatment flow. The PLC controller is electrically connected to the first sensor, the second sensor, and the hydrogen peroxide dosing unit, respectively. The first sensor is used to obtain data information such as the pollutant concentration, pH value, dissolved oxygen, turbidity, etc. of the water inlet flow of the hydrogen peroxide dosing unit. At the beginning of the system operation, the PLC controller receives the data information of the first sensor and controls the amount of hydrogen peroxide added by the hydrogen peroxide dosing unit according to the water quality of the water body to be treated. During the operation, the second sensor obtains information about toxic and harmful substances in the third treatment flow. After receiving the information, the PLC controller controls and adjusts the amount of hydrogen peroxide added by the hydrogen peroxide dosing unit until the toxic and harmful substances in the third treatment flow are reduced to the expected target. This closed-loop control system ensures the flexibility and adaptability of the treatment process, improves the water treatment efficiency and quality, and reduces the use of chemicals and reduces the operating cost. Among them, after the addition, the H in the organic micro-polluted water body 2 O 2The concentration of hydrogen peroxide is 5 to 20 mg / L, preferably, the concentration of hydrogen peroxide is 8 to 15 mg / L, and more preferably, the concentration of hydrogen peroxide is 10 mg / L. For example, the concentration of hydrogen peroxide can be 5 mg / L, 6 mg / L, 7 mg / L, 8 mg / L, 9 mg / L, 10 mg / L, 11 mg / L, 12 mg / L, 13 mg / L, 14 mg / L, 15 mg / L, 16 mg / L, 17 mg / L, 18 mg / L, 19 mg / L, 20 mg / L. When the concentration range of hydrogen peroxide is within this range, organic pollutants in water can be efficiently oxidized and degraded, and residual hydrogen peroxide in the second treatment flow can be reduced.

[0083] It is understandable that the PLC controller (Programmable Logic Controller) is an electronic system operated by digital calculations. It is a digital logic controller used for automatic control. The control instructions can be loaded into the memory at any time for storage and execution. The PLC controller is the core control element in this unit, responsible for receiving sensor data, processing information, and controlling the operation of the hydrogen peroxide dosing unit according to the preset logic. It has the functions of logic control, signal acquisition, data processing, timing and counting, output control, remote input and output, human-machine interface and fault self-diagnosis. The first sensor is responsible for detecting the water quality parameters of the organic micro-polluted 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 that can measure multiple water quality parameters at the same time and provide real-time data to support the decision-making process of the PLC controller. According to needs, it can include conductivity sensors, pH sensors, dissolved oxygen sensors, etc. to ensure comprehensive monitoring of the inlet water quality. The second sensor is a specific chemical substance sensor, such as a COD sensor, an ammonia nitrogen sensor, a blue-green algae sensor or a biosensor, which is specifically used to detect specific harmful substances in water.

[0084] In some embodiments, the second sensor is a dedicated bioluminescent sensor, which works by detecting the fluorescence intensity when toxic and harmful substances react with luminescent bacteria. It is developed based on the phenomenon that the photorespiration rate of luminescent bacteria decreases and the fluorescence intensity decreases when they encounter toxic and harmful organic matter. When the luminescent bacteria come into contact with toxic pollutants, their metabolism is affected, resulting in a decrease in luminescence intensity. This change in luminescence intensity can be measured by a light sensor. The second sensor can be composed of a biological reaction chamber containing immobilized luminescent bacteria, and the reaction chamber can be transparent to facilitate the detection of fluorescence. The second sensor can be equipped with an optical fiber or a photomultiplier tube for capturing and measuring the fluorescence intensity of luminescent bacteria. The second sensor uses specific luminescent bacteria, such as Vibrio Fischer, Vibrio qinghaiensis or Photobacterium luminescens, which are very sensitive to toxic and harmful substances in the environment. When they come into contact with these substances, their luminescence intensity will be weakened or extinguished.

[0085] In some embodiments, the control unit further includes a first processing flow detection unit for hydrogen peroxide addition and a UV / H 2 O 2 The third sensor for detecting the concentration of hydrogen peroxide in the second treatment flow produced by the oxidation device, and the fourth sensor for detecting the light transmittance of the water quality of the first treatment flow produced by the hydrogen peroxide dosing unit are installed on the UV / H 2 O 2 The third sensor, the fourth sensor and the fifth sensor are electrically connected to the input port of the PLC controller through their respective signal transmission paths, thereby allowing the sensor signal to be effectively transmitted between the PLC controller and the sensor. 2 O 2 The PLC controller controls the hydrogen peroxide dosing unit according to the hydrogen peroxide concentration data information to further achieve accurate dosing. The fourth sensor obtains the water quality transmittance of the water outlet of the hydrogen peroxide dosing unit. The fifth sensor obtains the UV / H 2 O 2 The UV intensity of the water being oxidized in the oxidation device is measured by the PLC controller, which receives the water quality transmittance and UV intensity information to further accurately control the UV / H 2 O 2 The UV irradiation intensity of the oxidation device can achieve better oxidation effect.

[0086] It is understood that the third sensor is an electrochemical or optical sensor dedicated to detecting the concentration of hydrogen peroxide; the third sensor is based on the amperometric measurement principle and determines the concentration of hydrogen peroxide by measuring the current generated when hydrogen peroxide is oxidized or reduced on the electrode. Alternatively, based on the principle of spectroscopy, the third sensor determines the concentration of hydrogen peroxide by measuring the current generated when hydrogen peroxide is oxidized or reduced on the electrode. 2 O 2 The concentration is determined by the absorption of light of a specific wavelength. The fourth sensor is an optical sensor used to measure the transmittance of the water quality of the water outflowing from the hydrogen peroxide dosing unit. The transmittance is an indicator of the clarity of water quality and is related to the content of suspended particles in the water. The fourth sensor is usually composed of a light source and one or more photodetectors, which can measure the intensity attenuation of light after passing through the water sample, thereby calculating the transmittance of the water sample. By monitoring the transmittance, the PLC controller can evaluate the water treatment effect and adjust the dosage of hydrogen peroxide or the intensity of UV radiation to optimize the oxidation process. The fifth sensor is an ultraviolet sensor used to detect UV / H 2 O 2 The intensity of ultraviolet light passing through the oxidized water in the oxidation device; the fifth sensor can operate based on a photovoltaic mode or a photoconductive mode to convert the ultraviolet signal into an electrical signal, and can use GaN-based materials or ZnS materials, which are highly sensitive and selective to ultraviolet rays.

[0087] In certain embodiments, in order to accurately monitor the flow rate of the fluid in the system, multiple flow meters may be installed in the transmission path of the coupling system of this embodiment to achieve further refined control of the flow rate, hydrogen peroxide concentration, and empty bed contact time of the biological activity device.

[0088] In a specific embodiment, see Figure 1 , provides a UV / H 2 O 2 Oxidation and biological porous media coupling system, including a hydrogen peroxide dosing unit, a UV / H 2 O 2 an oxidation device, a biological activity device, and an electrically connected control unit.

[0089] The hydrogen peroxide dosing unit includes a liquid storage container 1, a flow control device 2 and a mixing device 3, wherein the liquid storage container 1 is a liquid storage tank, in which a hydrogen peroxide solution is contained, the flow control device 2 is a peristaltic pump, and the mixing device 3 is a static mixer. The liquid storage tank, the peristaltic pump and the static mixer are connected in sequence by pipelines, and the peristaltic pump pumps the hydrogen peroxide solution in the liquid storage tank to the static mixer. The static mixer has an inlet and an outlet, as well as a dosing port for the peristaltic pump to connect. The dosing port is designed adjacent to the inlet of the static mixer, and the outlet and inlet of the static mixer are set according to the maximum distance between the static mixer and the inlet. The outlet of the peristaltic pump is connected to the dosing port pipeline of the static mixer, and the water body to be treated is input into the inlet of the static mixer. After the hydrogen peroxide and the water body to be treated are evenly mixed under the action of the static mixer, they are output from the outlet of the static mixer, and the outlet pipeline of the static mixer is connected to the UV / H 2 O 2 The oxidation device further performs oxidation treatment.

[0090] UV / H 2 O 2The oxidation device comprises an ultraviolet radiation light source and an oxidation reaction chamber. The oxidation reaction chamber is an oxidation reaction tank body 9. The ultraviolet radiation light source is a UV lamp tube 7 with a wavelength of 254 nanometers. The UV lamp tube 7 is installed in a quartz tube 6. The UV lamp tube 7 is fixed in the oxidation reaction tank body 9 through the quartz tube 6. An inlet and an outlet are arranged at two opposite ends of the oxidation reaction tank body 9. The inlet of the oxidation reaction tank body 9 is connected with a conveying pipeline of a water body / hydrogen peroxide mixed fluid to be treated. The water body / hydrogen peroxide mixed fluid to be treated enters the oxidation reaction chamber from the inlet of the oxidation reaction tank body 9. The quartz tube 6 provided with the UV lamp tube 7 is located at the center of the mixed fluid. The water body / hydrogen peroxide mixed fluid to be treated surrounds the quartz tube 6 and flows along its length direction to the outlet of the oxidation reaction tank body 9. This structural setting can reduce the arrangement of the UV lamp tube 7 and maximize the catalytic effect of ultraviolet light, so that the hydrogen peroxide in the organic micro-polluted water body / hydrogen peroxide mixed fluid is decomposed into highly oxidizing hydroxyl radicals (·OH).

[0091] The biological activity device includes a biological reaction chamber 11, a biological porous medium bed and a supporting layer arranged in the biological reaction chamber 11. The biological reaction chamber 11 is a cylindrical container. The top of the biological reaction chamber 11 has an inlet connected to the outlet pipeline of the oxidation reaction tank body 9. The bottom of the biological reaction chamber 11 has an outlet to output the treated water. The biological porous medium bed is horizontally filled in the biological reaction chamber 11. The biological porous medium bed is prepared by adding an appropriate amount of starch binder to activated carbon particles. The diameter of the biological porous medium bed matches the inner diameter of the biological reaction chamber 11. The activated carbon has a huge specific surface area and a developed pore structure, which can effectively adsorb organic matter and toxic substances in water. At the same time, the microbial film on the surface of the activated carbon particles can biologically degrade the adsorbed pollutants. A supporting layer is arranged at the bottom of the biological porous medium bed. The supporting layer is formed by pebbles laid on a grid and radially filled in the biological reaction chamber 11. An aeration mechanism 10 is installed at the inner bottom of the biological reaction chamber 11. The aeration mechanism 10 is located at the bottom of the support layer and blows air toward the support layer. The aeration mechanism 10 includes a plurality of truncated cone-shaped aeration chambers, which are connected to an air pump through a pipe, and the air pump is installed outside the biological activity device body; the aeration mechanism 10 is located at the bottom of the biological porous medium bed, and provides oxygen by blowing air toward the support layer. This process promotes the metabolic activity of aerobic microorganisms and enhances their ability to decompose organic pollutants in water; aeration also helps maintain the activity of the microbial membrane and prevents it from dying due to lack of oxygen.

[0092] The control unit includes a PLC controller 13, a first sensor 14, a second sensor 12, a third sensor 4, a fourth sensor 5 and a fifth sensor 8. The first sensor 14, the second sensor 12, the third sensor 4, the fourth sensor 5 and the fifth sensor 8 are electrically connected to the PLC controller 13 respectively for transmitting detection data information. The first sensor 14 is installed on the water inlet pipeline of the static mixer to detect the water quality parameters of the water body to be treated. In this embodiment, the first sensor 14 is a dissolved oxygen sensor, which is used to detect the dissolved oxygen (DO) concentration of organic micropollutants in the water body; the second sensor 12 is installed on the water outlet pipeline of the biological activity device to detect toxic and harmful substances in the treated water body. The second sensor 12 is a dedicated bioluminescence sensor, which is developed by the phenomenon that the photorespiration rate of luminescent bacteria decreases and the fluorescence intensity decreases when encountering toxic and harmful organic matter. The third sensor 4 is respectively installed on the pipeline from the oxidation reaction chamber to the biological activity device and the first treatment flow generated by the hydrogen peroxide addition unit to the UV / H 2 O 2 On the pipeline of the oxidation device, the third sensor 4 is a hydrogen peroxide concentration sensor to detect UV / H 2 O 2 The PLC controller is connected to the peristaltic pump circuit, and the PLC controller controls the dosage of the peristaltic pump according to the information received from the first sensor 14, the second sensor 12 and the third sensor 4. The fourth sensor 5 is installed in the first process flow generated by the hydrogen peroxide dosing unit to the UV / H 2 O 2 On the pipeline of the oxidation device, the fourth sensor 5 is a water quality transmittance sensor, which detects the transmittance of the first treatment flow after the addition of hydrogen peroxide. The fifth sensor 8 is installed on the outer wall of the quartz tube 6. The fifth sensor 8 is an ultraviolet light intensity sensor to monitor the ultraviolet light intensity of the UV lamp 7 passing through the water in the quartz tube 6 during the oxidation process. The PLC controller 13 is connected to the UV lamp 7 circuit, and the PLC controller 13 adjusts the ultraviolet light intensity of the UV lamp 7 according to the data of the fourth sensor 5 and the fifth sensor 8.

[0093] When the water purification coupling system of this embodiment is in operation, the water to be treated is transported to the oxidation reaction tank 9. During the transportation process, the hydrogen peroxide solution in the liquid storage tank is pumped to the water to be treated delivery pipeline by the peristaltic pump. The hydrogen peroxide solution is mixed with the water to be treated and then enters the oxidation reaction tank 9. Under the irradiation of the ultraviolet light with a wavelength of 254 nanometers radiated by the UV lamp 7, the hydrogen peroxide in the water to be treated is decomposed into hydroxyl radicals (·OH) with high oxidation activity. The hydroxyl radicals (·OH) degrade the organic pollutants in the water to be treated into carbon dioxide, water and other mineral salts, and generate a second treatment flow that is transported to the biological reaction chamber 11. The activated carbon porous medium bed in the biological reaction chamber 11 removes the residual H in the second treatment flow during the empty bed contact time of the first few minutes. 2 O 2 , then, the biofilm attached to the porous medium bed plays a role in converting undegraded organic pollutants into carbon dioxide, water and biomass, thereby obtaining a water body that meets the expected requirements. In this process, air is blown to the porous medium bed through the aeration mechanism 10 to further enhance the filtering effect of the porous medium bed, while providing the necessary oxygen for the biofilm, maintaining the metabolic activity of the biofilm microorganisms, and improving the degradation efficiency. In addition, during the operation, the initial hydrogen peroxide dosage is determined according to the first sensor 14. As the first water body to be treated is completed, the second sensor 12 obtains the data information of toxic and harmful substances in the third treatment flow, and further adjusts the dosage of hydrogen peroxide according to the data information of toxic and harmful substances, which not only improves the treatment effect, but also reduces the dosage of hydrogen peroxide, with the characteristics of low energy consumption, low cost and high efficiency. At the same time, the hydrogen peroxide concentration obtained by the third sensor 4, the water quality transmittance obtained by the fourth sensor 5, and the ultraviolet light intensity sensor obtained by the fifth sensor 8 can be further fine-tuned and monitored during the treatment process to achieve optimized operation, further improve the effect and reduce the cost.

[0094] The following is a detailed description of the present invention based on UV / H 2 O 2 The oxidation and biological porous media coupled water treatment method and system are exemplarily described.

[0095] Examples 1 to 5

[0096] Reference Figure 1 The treatment system shown in the figure uses the water source water of organic micropollutants in the lower reaches of the Pearl River as the water body to be treated. The main treatment targets are high-concentration odor substances geosmin (GSM) and dimethyl isoborneol (2-MIB). The treatment process is as follows:

[0097] S1 UV / H 2 O 2 Oxidation and its coupled system are applied to the treatment of organic micropollutants in the lower reaches of the Pearl River. UV / H2 O 2 The oxidation influent is the effluent after the following pretreatment process: Pearl River raw water → biological pre-oxidation → coagulation sedimentation flotation → sand filtration (effluent), among which the main water quality parameters of the sand filtration effluent are turbidity: 0.23NTU (<5NTU), UVT: 91.3% (>80%), TOC (2.89mg / L) and carbonate content (128mg / L);

[0098] S2: The sand-filtered water from the lower reaches of the Pearl River pre-treated in step S1 is passed through a UV / H 2 O 2 Oxidation device for oxidation sterilization, UV / H 2 O 2 The effluent from the oxidation device was used to domesticate and culture the compressed activated carbon bed (80×30 mesh) to complete the stable biofilm formation of granular activated carbon, and the heterotrophic plate count (HPC) and reduced coenzyme I (NADH) fluorescence detection method were used to determine the biomass on the carbon bed surface to obtain a qualified biological activated carbon bed. 2 O 2 H in water of oxidation device 2 O 2 The concentration and UV intensity are shown in Table 1.

[0099] S3: Add the odor substance GSM and 2-MIB standard solution with a concentration of 1000 ng / L to the sand filtered water in step S1 to form a water body to be treated. After the hydrogen peroxide adding unit adds hydrogen peroxide, the water body is subjected to UV / H 2 O 2 Advanced oxidation device oxidative degradation and biological activity device adsorption degradation; among them, H 2 O 2 The concentration and UV intensity are the same as in step S2, and the water flow rate is 1m 3 / h, the total empty bed contact time of the biological activated carbon bed is 21min.

[0100] Comparative Examples 1 to 3

[0101] Comparative Example 1 has the same treatment process as Example 1, except that: when the activated carbon bed is tamed in step S3, UV / H 2 O 2 The hydrogen peroxide concentration in the water entering the oxidation device is 3 mg / L, UV / H 2 O 2 The UV intensity of the oxidation device is 150mJ / cm 2 .

[0102] Comparative Example 2 has the same treatment process as Example 5, except that: when the activated carbon bed is tamed in step S3, UV / H 2 O 2The hydrogen peroxide concentration in the water entering the oxidation device is 25 mg / L, UV / H 2 O 2 The UV intensity of the oxidation device is 900mJ / cm 2 .

[0103] The treatment process of Comparative Example 3 is the same as that of Example 5, except that: the activated carbon bed of Comparative Example 3 is directly domesticated and cultured with the sand filtration water of step S1 to complete the stable biofilm formation of granular activated carbon, specifically: the sand filtration water after pretreatment of the lower reaches of the Pearl River in step S1 is used to domesticate and culture the briquette activated carbon bed (80×30 mesh) to complete the stable biofilm formation of granular activated carbon, and the heterotrophic plate count (HPC) and reduced coenzyme I (NADH) fluorescence detection method are used to determine the biomass on the carbon bed surface to obtain a qualified biological activated carbon bed.

[0104] Table 1 Processing conditions of Examples 1 to 5 and Comparative Examples 1 to 3

[0105] Example <![CDATA[H 2 O 2 Concentration (mg / L)]]> <![CDATA[UV intensity (mJ / cm 2 )]]> HPC (CFU / g) NADH(nM) Example 1 5 200 <![CDATA[6.1×10 8 ]]> 84 Example 2 5 800 <![CDATA[6.6×10 8 ]]> 91 Example 3 20 200 <![CDATA[7.9×10 8 ]]> 106 Example 4 20 800 <![CDATA[8.9×10 8 ]]> 119 Example 5 10 400 <![CDATA[8.3×10 8 ]]> 114 Comparative Example 1 3 150 <![CDATA[5.5×10 8 ]]> 70 Comparative Example 2 25 900 <![CDATA[9.3×10 8 ]]> 128 Comparative Example 3 10 400 <![CDATA[4.5×10 8 ]]> 65

[0106] Table 2 Distribution of biofilm flora in Examples 1 to 5

[0107]

[0108]

[0109] Table 3 Comparative Example 1-3 Biofilm flora distribution

[0110]

[0111] Experimental example

[0112] 1) UV / H 2 O 2 Pollutant removal effect of coupled biological activated carbon (BAC)

[0113] The UV / H 2 O 2 Influent water sample, UV / H 2 O 2 Outlet water sample and UV / H 2 O 2 +BAC effluent samples, each sample was repeated 3 times, the sampling interval of repeated water samples was 1h, and the geosmin, dimethyl isoborneol, COD in each water sample were tested respectively. Mn 、TOC、H 2 O 2 The content of each water sample was recorded, and the test data of each water sample was calculated, and the average value of the repeated water samples was calculated. The results are shown in Table 4.

[0114] Table 4 UV / H2 O 2 and biological activated carbon (BAC) effluent testing

[0115]

[0116]

[0117] From Table 4, we can see that UV / H 2 O 2 The advanced oxidation process has a good removal effect on odor substances GSM and 2-MIB, and the removal rate increases with the increase of hydrogen peroxide dosage and UV dose. When the hydrogen peroxide dosage is 10 mg / L and the UV dose is 400 mJ / cm 2 When UV / H 2 O 2 The removal rate of GSM and 2-MIB in the effluent of the advanced oxidation process coupled with biological activated carbon reached 100%. 2 O 2 Residual H in effluent after advanced oxidation process 2 O 2 Removed by coupled biological activated carbon process. Regarding TOC removal effect, UV / H 2 O 2 The TOC removal rate of the effluent is 1% to 20%, and the TOC removal rate of the downstream coupled biological porous media is 42% to 98%.

[0118] 2) Removal effect of intermediate organic by-products

[0119] Collect UV / H during the treatment of Example 5 2 O 2 Outlet water sample and UV / H 2 O 2 +BAC effluent samples were analyzed and identified for organic compounds using UHPLC-Q-Orbitrap ultra-high performance liquid chromatography / high-resolution mass spectrometry. The results are shown in Tables 5 and 6.

[0120] Table 5 Removal effect of intermediate organic by-products (changes in the types of organic matter in and out of the water)

[0121] Example <![CDATA[UV / H 2 O 2 Water Inlet]]> <![CDATA[UV / H 2 O 2 Water]]> <![CDATA[UV / H 2 O 2 +BAC water]]> Example 1 573 species 458 57 types Example 2 569 species 436 types 46 types Example 3 568 species 421 species 51 types Example 4 542 species 502 species 54 types Example 5 556 types 409 types 39 types Comparative Example 1 543 species 467 species 168 types Comparative Example 2 561 species 524 types 153 types Comparative Example 3 524 types 490 227 types

[0122] Table 6 Relative content (peak area) of representative intermediate organic by-products in Example 5

[0123]

[0124]

[0125] From Table 5, we can see that UV / H 2 O 2The changes of organic matter in the advanced oxidation process under different reaction conditions are uncontrollable because it includes both the removal of organic matter in the influent and the appearance of new products in the effluent. Therefore, the types of effluent products do not completely change with the H 2 O 2 The amount of addition and the increase of UV dose decreased, and the downstream coupled biological activated carbon had a significant effect on the removal of organic by-products. The main reason is that the biofilm on the biological activated carbon plays a major role in the removal of influent and newly generated products, and the abundance distribution of the biofilm bacteria is the key to the removal of influent and newly generated products. Examples 1 to 5 achieved an organic by-product removal effect of more than 87% and an organic matter removal effect of more than 90% through downstream coupled biological activated carbon. Among them, Example 5 had the best bacterial distribution performance, and 556 organic substances were identified in its influent, which were 2 O 2 After the process, 409 kinds of organic matter were identified in the water, while 39 kinds of organic matter were identified after the treatment of the living carbon bed. The removal rate of oxidation byproducts reached 90%, and the removal effect of organic matter reached 93%. 2 O 2 The dosage and UV dose were both at a low level. This difference had a significant impact on the cultivation stage of the activated carbon bed biofilm, which was specifically manifested in that the dissolved oxygen content in the domesticated water was relatively low, and the biofilm flora structure in Comparative Example 1 tended to develop towards anaerobic type. This flora preference was not conducive to the effective degradation of organic pollutants in the water. In Examples 1 to 5 of the present application, the appropriate H 2 O 2 The dosage and UV dose ensured a sufficient oxygen environment, which was conducive to the formation of aerobic or facultative bacterial communities that were beneficial to the degradation of organic matter, thereby improving the overall efficiency of the biofilm treatment system. 2 O 2 Effect of dosage and UV dose on geosmin, dimethyl isoborneol, COD Mn , TOC all showed excellent technical effects, but excessive H 2 O 2 and UV agents also increase the generation of new products. At the same time, due to the excess H 2 O 2 and ultraviolet agent, the non-aerobic bacteria with strong organic matter metabolism ability in the dominant bacterial flora were inactivated by the active substances, and the bacterial flora changed, resulting in a poor final removal effect. Comparative Example 3 Due to the different water quality of the domesticated influent, the bacterial flora also changed greatly. The domestication methods of Examples 1 to 5 of the present application showed excellent removal effects compared with Comparative Example 3.

[0126] It can be further seen from the results in Table 6 that the representative organic byproduct results of Example 5 show that UV / H 2 O2 The removal rate of chloroform, atrazine, triisobutyl phosphate, phenol and pyrimethanil in the influent can reach 100%. The biological activated carbon has a strong resistance to UV / H 2 O 2 The newly generated products in the effluent, such as albendazole, o-hexene, isobutyl ether, leucine methyl ester, anthracene, spiropentane, 4-iododobutamine and residual organic matter, all showed significant removal effects, even reaching 100%.

[0127] 3) Changes in toxicity of effluent from process operation

[0128] Due to UV / H 2 O 2 The organic products of the advanced oxidation process are uncontrollable, so the effluent toxicity monitoring was carried out in conjunction with the process effluent. During the process operation, the effluent toxicity detection after the biological activated carbon process did not fluctuate much, and no effluent toxicity biological alarm occurred. From the analysis results, it can be seen that during the entire operation period, the H 2 O 2 Dosage and UV dosage, combined process effluent is free of H 2 O 2 Residual and toxic intermediate degradation products are controllable, ensuring the long-term efficient, green and safe supply of drinking water.

[0129] The above is only the preferred embodiment of the present application, and does not limit the present application in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present application without departing from the technical solution of the present application still falls within the protection scope of the technical solution of the present application.

Claims

1. Water treatment method based on UV / H2O2 oxidation and biological porous media coupling, including: Adding hydrogen peroxide to the water body to be treated and mixing to obtain a first treatment flow; subjecting the first process stream to ultraviolet radiation to produce an oxidatively degraded second process stream; Adsorbing and degrading the residual hydrogen peroxide and oxidative degradation byproducts in the second treatment flow using a biological porous media bed; A biofilm is attached to the porous medium surface of the biological porous medium bed, and the dominant bacterial groups of the biofilm include: Belnapia, Sphingomonas, Gemmata, Methylov ersatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, Paracraurococcus, and the relative abundance of each genus is 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09% and 0%-2.36%, respectively.

2. According to the water treatment method based on UV / H2O2 oxidation and biological porous media coupling according to claim 1, the dominant bacterial community of the biofilm includes: The relative abundance of Belnapia, Sphingomonas, Gemmat a, Methyloversatilis, Sphingobium, Bradyrhizobium, and Haliscomenobacter were 12.09%, 8.75%, 6.66%, 5.73%, 4.62%, 3.07%, and 2.86%, respectively.

3. The water treatment method based on UV / H2O2 oxidation and biological porous media coupling according to claim 1, wherein the concentration of hydrogen peroxide in the first treatment flow is 5-20 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 200-800 mJ / cm 2 Preferably, the concentration of hydrogen peroxide in the first treatment flow is 10 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 400 mJ / cm 2 .

4. According to the water treatment method based on UV / H2O2 oxidation and biological porous media coupling according to claim 1, the effluent treated by UV / H2O2 oxidation is passed into a porous media bed and continuously accumulates on the surface of the porous media to form the biofilm.

5. The water treatment method based on UV / H2O2 oxidation and biological porous media coupling according to claim 1, wherein the average microbial concentration of the biofilm is 6.1×10 8 ~8.9×10 8 CFU / g, and the NADH value is 84-119 nM; preferably, the average microbial concentration of the biofilm is 8.3×10 8 CFU / g, NADH value is 114nM.

6. Water treatment system based on UV / H2O2 oxidation and biological porous media coupling, including: A hydrogen peroxide dosing unit, wherein the hydrogen peroxide dosing unit has a hydrogen peroxide liquid storage container, and the liquid storage container outputs hydrogen peroxide to the water body to be treated to mix and form a first treatment flow; A UV / H2O2 oxidation device, wherein the UV / H2O2 oxidation device receives a first treatment stream and oxidatively degrades the first treatment stream by ultraviolet radiation to generate a second treatment stream; A bioactive device, wherein the bioactive device has a biological porous medium bed, a biofilm is attached to the porous medium surface of the biological porous medium bed, the second treatment flow enters the biological active device and is adsorbed and degraded by the biological porous medium bed to produce a third treatment flow; the dominant bacterial community of the biofilm includes: Belnapia, Sphingomonas, Gemmata, Methyloversatilis, Sphingobium, Bradyrhizobium, Haliscomenobacter, Methylobacterium, Paracraurococcus, and the relative abundance of each genus is 11.20%-13.46%, 7.05%-10.24%, 5.89%-8.47%, 4.76%-6.68%, 0%-5.17%, 2.87%-4.11%, 0%-3.73%, 0%-2.09% and 0%-2.36%, respectively.

7. The water treatment system based on UV / H2O2 oxidation and biological porous media coupling according to claim 6, wherein the concentration of hydrogen peroxide in the first treatment flow is 5-20 mg / L, and the ultraviolet light intensity of the ultraviolet irradiation is 200-800 mJ / cm 2 The average microbial concentration HPC of the biofilm is 6.1×10 8 ~8.9×10 8 CFU / g, NADH value is 84~119nM.

8. According to claim 6, the water treatment system based on UV / H2O2 oxidation and biological porous media coupling, the UV / H2O2 oxidation device includes an ultraviolet radiation light source and an oxidation reaction chamber, the ultraviolet radiation light source is arranged in the oxidation reaction chamber, and is used to provide ultraviolet irradiation to the fluid passing through the oxidation reaction chamber, the oxidation reaction chamber receives the first treatment flow, and outputs a second treatment flow after ultraviolet irradiation.

9. The water treatment system based on UV / H2O2 oxidation and biological porous media coupling according to claim 6, wherein the biological activity device comprises a biological reaction chamber and the biological porous media bed filled in the biological reaction chamber, and the biological reaction chamber has an inlet for receiving the second treatment flow and an outlet for outputting the third treatment flow.

10. The water treatment system based on UV / H2O2 oxidation and biological porous media coupling according to claim 6, wherein the water treatment system further comprises a control unit, wherein the control unit comprises: A first sensor, wherein the first sensor detects water quality data of a water body to be treated; a second sensor, the second sensor detecting data of toxic and hazardous organic matter in a third processing flow; A PLC controller receives data collected by the first sensor and the second sensor to control the amount of hydrogen peroxide added by the hydrogen peroxide adding unit.

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