Efficient dissolved gas ozone oxidation-biochemical coupling sewage advanced treatment device

Abstract

The invention discloses a high-efficiency dissolved gas ozonation-biochemical coupling sewage advanced treatment device. The device comprises an integrated device consisting of an ozonation unit and a biological membrane unit, a micro-nano ozone dissolved gas adding system, a biological membrane tank effluent reflux system and a control system. The ozone dissolved gas adding system generates microbubbles with the average diameter not exceeding 30 microns; the sewage treatment retention time of the ozone oxidation unit does not exceed 15 min, and the height does not exceed 2 m; a gas outlet and a water outlet of the ozone oxidation unit are communicated to the bottom of the biological membrane unit, and tail gas is directly used for aeration of the biological membrane unit; the sewage treatment retention time of the biological membrane unit is longer than 30 min, and the height is 4-10 m. Through the microbubble technology and the integrated design, the ozone utilization rate and the treatment efficiency of the ozone oxidation-biochemical coupling device are remarkably improved, the occupied area is reduced, and meanwhile effective utilization of ozone tail gas is achieved. The device is suitable for advanced treatment of various types of sewage.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device. Background Art

[0002] With the continuous improvement of industrial development and environmental protection requirements, sewage deep treatment technology has become a key area of ​​water environment management. Traditional sewage treatment methods are often difficult to effectively remove refractory organic matter and trace pollutants, so the combination of advanced oxidation technology and biological treatment technology has become a research hotspot.

[0003] As an advanced advanced oxidation technology, ozone oxidation has been widely used in the field of water treatment due to its strong oxidation ability and no secondary pollution. However, traditional ozone oxidation technology has problems such as low ozone utilization, high treatment cost, and complex equipment. As an important method for sewage treatment, biological treatment technology has the advantages of low treatment cost and less secondary pollution; but traditional biological treatment has poor removal effect on difficult-to-degrade organic matter. Ozone oxidation is coupled with biological treatment technology, and the subsequent biological treatment effect is improved by ozone pretreatment. Chinese patent application No. 202011025682.3 discloses an ozone oxidation-biochemical coupled sewage deep treatment method and device, which returns the back-end biochemical effluent to the front-end ozone oxidation inlet, and the water to be treated is circulated and treated multiple times in the ozone oxidation-biochemical system through reflux. However, this technology still has the defects of low ozone utilization, large area occupied by the treatment unit, and high investment.

[0004] As an emerging gas-liquid mass transfer enhancement technology, microbubble technology has shown great potential in the field of water treatment. China's public patent document 202121838141.2 discloses a wastewater treatment system combining ozone micro-nano bubble oxidation and biotechnology, including an ozone oxidation zone with a catalytic module, a micro-nano bubble generator, and a post-biological reaction zone. The treatment efficiency in wastewater is improved by combining ozone micro-nano bubble oxidation and biotechnology. China's public patent document 202123066387.5 discloses an industrial wastewater micro-nano AOP treatment system, including a raw water tank, an ozone generator, a gas-liquid mixing pump, a pressurized oxidation tank, a BAF reaction tank, and a BAC reaction tank; the overall gas-water ratio of the system and the absolute number of ozone micro-nano bubbles are increased by effluent reflux, promoting repeated AOP modification + biochemical degradation of difficult-to-degrade organic matter in wastewater, and reducing ozone usage. Chinese patent document 202310364974.7 discloses a system and method for deep treatment of industrial wastewater toxicity by microbubble ozone oxidation-biochemical coupling, which utilizes a single or combined metal compound, or a supported composite metal compound as an ozone reaction catalyst. The operating cost of ozone catalytic oxidation is high, and the residence time of wastewater in the microbubble ozone reaction tank is 1.0 to 2.5 hours, and the residence time in the reduction tank is 0.5 to 1.0 hours. The residence time is long, the equipment occupies a large area, and the investment cost is high.

[0005] In summary, the existing ozone oxidation and biological treatment are usually connected in series or in parallel, with complex device structures, long residence time, and relatively low ozone utilization and treatment efficiency. How to achieve close coupling of ozone oxidation and biological treatment and improve the overall treatment efficiency of the system has become the focus and difficulty of current research on sewage deep treatment technology. Based on this, it is urgent to develop a new sewage deep treatment device that can significantly improve ozone utilization, shorten treatment time, reduce floor space, and achieve efficient coupling of ozone oxidation and biological treatment. Summary of the invention

[0006] The purpose of the present invention is to provide a high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device in view of the deficiencies in the prior art, aiming to solve the problems of low ozone utilization, low treatment efficiency, large footprint, complex ozone tail gas treatment, etc. existing in the existing ozone oxidation-biochemical treatment technology. The device of the present invention is reasonably and ingeniously designed and can achieve efficient, compact and economical sewage deep treatment.

[0007] To achieve the purpose of the present invention, the technical problems to be solved by the present invention include: (1) How to improve the ozone dissolution efficiency and utilization rate of the ozone oxidation-biochemical coupling device through micro-nano dissolved gas? (2) How to shorten the overall treatment time of the ozone oxidation-biochemical coupling treatment device to reduce land occupation and engineering investment? (3) How to achieve efficient utilization of ozone tail gas from the ozone oxidation-biochemical coupling device, avoid environmental dissipation of ozone tail gas and save investment in ozone tail gas treatment? In order to solve the above technical problems, the technical solution of the present invention is as follows: The present invention is an ozone oxidation-biochemical coupled sewage deep treatment device, which is characterized in that it mainly comprises an integrated device whose main body is composed of an ozone oxidation unit (1) and a biofilm unit (2) in a left-right, top-bottom, inside-out or nested manner; the ozone oxidation unit (1) treats sewage for a residence time of no more than 15 minutes and a height of no more than 2 meters; the air outlet and the water outlet of the ozone oxidation unit (1) are both connected to the bottom of the biofilm unit (2), and the tail gas of the ozone oxidation unit (1) is directly used as aeration for the biofilm unit (2); the biofilm unit (2) treats sewage for a residence time of more than 30 minutes and a height of 4 to 10 meters; The deep treatment device further comprises: a water inlet system (3); an ozone dissolved gas dosing system (4) for generating micro-nano bubbles, wherein the average diameter of the micro-bubbles does not exceed 30 μm; and a water outlet system (5); Biofilm unit effluent return system (6); control system (7); The deep processing device is arranged in one stage, two stages or multiple stages. When it is arranged in two stages or multiple stages, the stages are connected in series or in parallel to form a large-scale processing device.

[0008] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention has a further preferred technical solution: the dissolved ozone dosing system (4) is composed of a centrifugal pump (41), a cyclone cutting gas-liquid pipeline mixer (42), a pressure buffer tank (43), a releaser (44), a plurality of pressure gauges, and a flow meter connected in sequence, and the gas-liquid ratio is preferably 0.05-0.25, the centrifugal pump outlet pressure is preferably 0.3-0.5 MPa, and the pipeline mixer outlet pressure is preferably ≥0.1 MPa.

[0009] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device described in the present invention has a further preferred technical solution: the ozone dissolved air dosing system (6) comprises an inlet ozone dissolved air dosing system and a biofilm pool outlet reflux ozone dissolved air dosing system.

[0010] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device described in the present invention has a further preferred technical solution: when the deep treatment device is used for treating high-salt wastewater and RO concentrated brine, the sewage residence time of the ozone oxidation unit does not exceed 10 minutes.

[0011] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device described in the present invention has a further preferred technical solution: the deep treatment device is used for deep treatment of municipal sewage and petrochemical sewage, and the sewage residence time of the ozone oxidation unit does not exceed 5 minutes.

[0012] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention has a further preferred technical solution: the ozone oxidation unit (1) contains one or more cylindrical central tubes (111) and corresponds one to one with the releasers of the ozone dissolved air dosing system; the central tube pool wall has a plurality of protruding mushroom heads (113), and the outlet of the releaser of the ozone dissolved air dosing system sprays at an angle of 30° to the central tube pool wall to form an air-water vortex.

[0013] A further preferred technical solution of the high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention is that no independent ozone tail gas destruction system and biofilm unit aeration system are provided.

[0014] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention has a further preferred technical solution: the biofilm unit (2) has a built-in bio-rope filler, and the filler has a diameter of 20-25 mm, a filler installation spacing of 50 mm×50 mm, and a filler film thickness of not less than 0.5 mm.

[0015] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention has a further preferred technical solution: the biofilm treatment unit (2) has a built-in MBBR filler, and the MBBR filler is fixed by a plurality of upper and lower steel wire mesh frames, and the filler film thickness is not less than 0.5 mm.

[0016] The highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of the present invention has a further preferred technical solution: the integrated device is a cylindrical tank body, the effective height of the tank body is preferably 8-12m, and the lower part is an ozone oxidation unit, the upper part is a biofilm unit, and the biological fillers inside the biofilm unit are arranged in multiple layers; Alternatively, the integrated device is a square tank body, the effective height of the tank body is preferably 4-8 m and is divided into horizontal grids, wherein the lower part of the first grid is the ozone oxidation unit (1), and the rest is the biofilm unit (1); Alternatively, the integrated device is a circular or elliptical pool body, the effective height of the pool body is 4 to 8 m and is divided into inner and outer compartments, the inner circle is the ozone oxidation unit (1), and the outer circle is the biofilm unit (2).

[0017] Compared with the prior art, the beneficial technical effects of the present invention include: (1) The application of microbubble ozone dissolved gas dosing technology in ozone oxidation-biochemical devices not only improves the dissolution efficiency and utilization rate of ozone, reduces ozone consumption, but also significantly shortens the overall processing time and floor space of the ozone oxidation-biochemical coupling device.

[0018] (2) Microbubble ozone tail gas is directly used for aeration of the biofilm unit, avoiding the need for additional tail gas treatment equipment, simplifying system design, reducing ozone tail gas emissions, and lowering the footprint and construction cost of the device.

[0019] (3) In the method of the present invention, the flexible design scheme of cylindrical, square, circular / elliptical and annular pool bodies can adapt to different site and treatment scale requirements; higher-level treatment or large-scale application can be achieved through series or parallel connection.

[0020] (4) Easy to operate, stable operation and low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the structure of the integrated device of the upper and lower arrangement of the present invention; Figure 2 It is a schematic diagram of the structure of the integrated device of the left-right arrangement of the present invention; Figure 3 It is a schematic diagram of the structure of the integrated device of the left (upper and lower) right arrangement of the present invention; Figure 4 It is a schematic diagram of the structure of the integrated device of the internal and external arrangement mode of the present invention; Figure 5 It is an ozone dissolved gas dosing system; Figure 6-1 This is the front view of the central tube of the ozone oxidation unit; Figure 6-2 This is a top view of the central cylinder of the ozone oxidation unit; Figure 7-1 Arrange the main view for the biofilm unit filler; Figure 7-2 A top view of the biofilm unit filler arrangement; Figure 8 It is a two-stage integrated device connected in series; Fig. 9 It is a parallel integrated device; The reference numerals in the drawings of the specification are as follows: 1. Ozone oxidation tank; 2. Biofilm tank; 3. Water inlet system; 4. Ozone dissolved gas dosing system; 5. Water outlet system; 6. Biofilm tank reflux system; 11. Central tube; 12. Gas distribution system; 13. Gas collection system; 21. Biofilm filler; 22. Biofilm filler fixing frame 41. Ozone dissolved gas pump; 42. Cyclone cutting gas-liquid pipeline mixer; 43. Pressure buffer tank; 44. Microbubble ozone releaser; 111. Central tube outer wall; 112. Water inlet; 113. Mushroom head; 114. Water inlet pipe; DETAILED DESCRIPTION

[0022] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute a limitation on the rights thereof.

[0023] Embodiment 1, as Figure 1 As shown, the high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device of this embodiment adopts an integrated design in an upper and lower arrangement, including an ozone oxidation unit 1 and a biofilm unit 2.

[0024] The ozone oxidation unit 1 is located at the bottom, with a height of 1.8m and a wastewater retention time of 12min. A cylindrical central tube 111 (such as Figure 6-1 , Figure 6-2 As shown in FIG. 1 , the central cylinder pool wall is provided with a plurality of protruding mushroom heads 113. The outlet of the water inlet pipe 114 is sprayed at an angle of 30° with the central cylinder pool wall to form a gas-water cyclone.

[0025] The biofilm unit 2 is located at the top, with a height of 6m and a wastewater retention time of 45min. The biofilm unit is equipped with a bio-rope filler 21 (such as Figure 7-1 , Figure 7-2 As shown), the filler diameter is 2.0mm, the installation spacing is 50mm×50mm, and the filler film thickness is 0.8mm.

[0026] Ozone dissolved gas dosing system 4 (such as Figure 5 The system is composed of the following components connected in sequence: a centrifugal pump 41, a swirl cutting gas-liquid pipeline mixer 42, a pressure buffer tank 43, a releaser 44, a pressure gauge and a flow meter. The system operating parameters are set as follows: gas-liquid ratio 0.15, centrifugal pump outlet pressure 0.4MPa, pipeline mixer outlet pressure 0.15MPa. The average diameter of the microbubbles generated by the system is 25μm.

[0027] The device also includes a water inlet system 3, a biofilm pool effluent return system 6 and a control system (not shown in the figure).

[0028] During operation, sewage first enters the ozone oxidation unit 1, where it is fully contacted with the microbubble ozone to undergo an oxidation reaction. The effluent and tail gas of the ozone oxidation unit 1 both pass through and enter the bottom of the biofilm unit 2. The tail gas is directly used as aeration for the biofilm unit 2, without the need for an additional tail gas treatment system.

[0029] Part of the water treated by the biofilm unit 2 is discharged through the water outlet, and the other part is returned to the inlet of the ozone oxidation unit 1 through the reflux system 6 to improve the overall treatment efficiency.

[0030] The device of this embodiment is used to treat the difficult-to-degrade organic wastewater of a chemical plant. The inlet COD is 500 mg / L, the outlet COD can be stably reduced to less than 50 mg / L, and the COD removal rate exceeds 90%. Compared with the traditional series ozone oxidation-biological treatment process, the device occupies 30% less space, increases the ozone utilization rate by 10%, and reduces the total treatment cost by 15%.

[0031] It should be noted that this embodiment is only one of the preferred implementations of the present invention. According to actual needs, the present invention can also adopt a left-right arrangement (such as Figure 2 As shown), internal and external layout (as shown Figure 3 As shown), annular arrangement (as Figure 4 ) and other methods. In addition, the biofilm unit can also use MBBR filler, and the residence time of the ozone oxidation unit can be adjusted according to the water quality characteristics. For example, when treating high-salinity wastewater, the residence time of the ozone oxidation unit can be shortened to 8 minutes; when treating municipal sewage, it can be further shortened to 4 minutes.

[0032] The present invention successfully solves multiple problems existing in the ozone oxidation-biological treatment process through innovative integrated design and application of microbubble technology, and significantly improves the treatment efficiency and economy.

[0033] In order to further verify the applicability and advantages of the present invention, we also conducted the following comparative tests: Test 1: Deep treatment of high-salt RO concentrated water The device of the present invention was used to treat RO concentrated water from a certain circulating water wastewater, and the residence time of the ozone oxidation unit was adjusted to 10 minutes. The influent COD was 160 mg / L and the salinity was 12 g / L. After treatment, the effluent COD was stabilized below 40 mg / L, and the COD removal rate reached 75%. Compared with the traditional process, the device of the present invention showed better stability and efficiency in treating high-salinity wastewater.

[0034] Experiment 2: Advanced treatment of municipal wastewater The device of the present invention is used in the deep treatment process of a certain urban sewage treatment plant, and the residence time of the ozone oxidation unit is adjusted to 5 minutes. The influent COD is 400 mg / L, and the effluent COD is stabilized below 15 mg / L, meeting the Class A emission standard. Compared with the original deep treatment process, the device of the present invention reduces the floor space by 50% and the operating cost by 30%.

[0035] Experiment 3: Effect of serial application Two devices of the present invention were used in series to treat the difficult-to-degrade wastewater from a centralized sewage treatment plant in a chemical park. The influent COD was 250 mg / L. After two-stage treatment, the effluent COD dropped to 38 mg / L, and the total removal rate reached 74.8%. Compared with the original treatment process of the sewage treatment plant, the device of the present invention reduced the floor space by 38% and the operating cost by 25%. This result proves that the device of the present invention has good scalability and adaptability.

[0036] In the above embodiments and tests, the device of the present invention exhibits the following advantages: (1) High ozone utilization rate: Microbubble technology significantly improves the dissolution efficiency and utilization rate of ozone. The average ozone utilization rate reaches over 95%, which is much higher than the 60~70% of traditional bubbling ozone contact tower.

[0037] (2) High treatment efficiency: The close coupling of ozone oxidation and biological treatment, coupled with the internal reflux design, greatly improves the overall treatment efficiency. The removal effect on difficult-to-degrade organic matter is particularly significant.

[0038] (3) Small footprint: The integrated design and high-efficiency processing reduce the footprint of the device by 40-50% compared to traditional processes.

[0039] (4) Low energy consumption: Ozone tail gas is directly used for aeration of the biofilm unit, avoiding the need for additional tail gas treatment equipment and biological pool aeration system, significantly reducing energy consumption.

[0040] (5) Strong adaptability: By adjusting the residence time of the ozone oxidation unit and the type of biological filler, it can adapt to the treatment needs of sewage of different types and concentrations.

[0041] (6) Easy operation: The integrated design and intelligent control system make daily operation and maintenance simple.

[0042] (7) Low investment cost: Compact design and standardized production make the equipment investment cost low.

[0043] (8) Stable operation: Multiple protection measures and intelligent control ensure the stable operation of the device under various working conditions.

[0044] Example 2, reference Figure 1-9. A highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device: comprising an integrated device whose main body is composed of an ozone oxidation unit 1 and a biofilm unit 2 in a left-right, up-down, inside-out or nested manner; the ozone oxidation unit 1 treats sewage for a residence time of no more than 15 minutes and a height of no more than 2 meters; the air outlet and water outlet of the ozone oxidation unit 1 are both connected to the bottom of the biofilm unit 2, and the tail gas of the ozone oxidation unit 1 is directly used as aeration for the biofilm unit 2; the biofilm unit 2 treats sewage for a residence time of more than 30 minutes and a height of 4 to 10 meters; The deep treatment device also includes: a water inlet system 3; an ozone dissolved gas dosing system 4 for generating micro-nano bubbles, wherein the average diameter of the micro-bubbles does not exceed 30 μm; a water outlet system 5; a biofilm unit water outlet return system 6; and a control system; The deep processing device is arranged in one, two or more stages. When it is arranged in two or more stages, the stages are connected in series or in parallel to form a large-scale integrated processing device.

[0045] The ozone dissolved gas dosing system 4 is composed of a centrifugal pump 41, a swirl cutting gas-liquid pipeline mixer 42, a pressure buffer tank 43, a releaser 44, multiple pressure gauges, and a flow meter connected in sequence, and the gas-liquid ratio is 0.05-0.25, the centrifugal pump outlet pressure is 0.3-0.5MPa, and the pipeline mixer outlet pressure is ≥0.1Mpa.

[0046] The ozone dissolved gas dosing system 6 includes an inlet ozone dissolved gas dosing system and a biofilm pool outlet reflux ozone dissolved gas dosing system.

[0047] When the deep treatment device is used for treating high-salt wastewater and RO concentrated brine, the wastewater retention time of the ozone oxidation unit does not exceed 10 minutes.

[0048] The deep treatment device is used for deep treatment of municipal sewage and petrochemical sewage, and the sewage retention time of the ozone oxidation unit does not exceed 5 minutes.

[0049] The ozone oxidation unit 1 includes one or more cylindrical central tubes 111 and corresponds to the releasers of the ozone dissolved gas dosing system one by one; the wall of the central tube pool has a plurality of protruding mushroom heads 113, and the outlet of the releaser of the ozone dissolved gas dosing system sprays at an angle of 30° to the wall of the central tube pool to form a gas-water vortex.

[0050] The invention does not provide an independent ozone tail gas destruction system and a biofilm unit aeration system.

[0051] The biofilm unit 2 has built-in bio-rope fillers, and the filler diameter is 20-25 mm, the filler installation spacing is 50 mm×50 mm, and the filler biofilm thickness is not less than 0.5 mm.

[0052] The biofilm treatment unit 2 has built-in MBBR filler, and the MBBR filler is fixed by a plurality of upper and lower steel wire mesh frames, and the thickness of the filler film is not less than 0.5 mm.

[0053] The integrated device is a cylindrical tank body with an effective height of 8 to 12 m, and the lower part is an ozone oxidation unit, the upper part is a biofilm unit, and the biological fillers inside the biofilm unit are arranged in multiple layers; or, the integrated device is a square tank body, the effective height of the tank body is preferably 4 to 8 m and is horizontally divided into grids, wherein the lower part of the first grid is the ozone oxidation unit 1, and the rest are the biofilm units 1; or, the integrated device is a circular or elliptical tank body, the effective height of the tank body is 4 to 8 m and is divided into inner and outer grids, the inner circle is the ozone oxidation unit 1, and the outer circle is the biofilm unit 2.

[0054] In summary, the high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device provided by the present invention successfully solves multiple problems faced by the prior art through innovative design and advanced technology, and provides a new efficient, economical and environmentally friendly solution for the sewage deep treatment field. The device shows excellent performance and wide applicability in practical applications, and has good promotion value and market prospects.

Claims

1. A highly efficient dissolved air ozone oxidation-biochemical coupling sewage deep treatment device, characterized by: It comprises an integrated device whose main body is composed of an ozone oxidation unit (1) and a biofilm unit (2) in a left-right, up-down, inside-out or nested manner; the ozone oxidation unit (1) treats sewage for a residence time of no more than 15 minutes and a height of no more than 2 meters; the air outlet and water outlet of the ozone oxidation unit (1) are both connected to the bottom of the biofilm unit (2), and the tail gas of the ozone oxidation unit (1) is directly used as aeration for the biofilm unit (2); the biofilm unit (2) treats sewage for a residence time of more than 30 minutes and a height of 4 to 10 meters; The deep treatment device further comprises: a water inlet system (3); an ozone dissolved gas dosing system (4) for generating micro-nano bubbles, wherein the average diameter of the micro-bubbles does not exceed 30 μm; a water outlet system (5); a biofilm unit water outlet return system (6); and a control system; The deep processing device is arranged in one, two or more stages. When it is arranged in two or more stages, the stages are connected in series or in parallel to form a large-scale integrated processing device.

2. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The ozone dissolved gas dosing system (4) is composed of a centrifugal pump (41), a swirl cutting gas-liquid pipeline mixer (42), a pressure buffer tank (43), a releaser (44), a plurality of pressure gauges, and a flow meter, which are connected in sequence. The gas-liquid ratio is preferably 0.05-0.25, the centrifugal pump outlet pressure is preferably 0.3-0.5 MPa, and the pipeline mixer outlet pressure is preferably ≥0.1 MPa.

3. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The ozone dissolved gas dosing system (6) comprises an inlet ozone dissolved gas dosing system and a biofilm pool outlet reflux ozone dissolved gas dosing system.

4. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: When the deep treatment device is used for treating high-salt wastewater and RO concentrated brine, the wastewater retention time of the ozone oxidation unit does not exceed 10 minutes.

5. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The deep treatment device is used for deep treatment of municipal sewage and petrochemical sewage, and the sewage retention time of the ozone oxidation unit does not exceed 5 minutes.

6. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 or 2 is characterized in that: The ozone oxidation unit (1) comprises one or more cylindrical central tubes (111) in a one-to-one correspondence with the releasers of the ozone dissolved gas dosing system; the wall of the central tube pool has a plurality of protruding mushroom heads (113), and the outlet of the releaser of the ozone dissolved gas dosing system sprays at an angle of 30° to the wall of the central tube pool to form a gas-water vortex.

7. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The invention does not provide an independent ozone tail gas destruction system and a biofilm unit aeration system.

8. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The biofilm unit (2) has a built-in bio-rope filler, the filler has a diameter of 20-25 mm, the filler installation spacing is 50 mm×50 mm, and the filler biofilm thickness is not less than 0.5 mm.

9. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The biofilm treatment unit (2) has a built-in MBBR filler, and the MBBR filler is fixed by a plurality of upper and lower steel wire mesh frames, and the thickness of the filler biofilm is not less than 0.5 mm.

10. The high-efficiency dissolved air ozone oxidation-biochemical coupling sewage deep treatment device according to claim 1 is characterized by: The integrated device is a cylindrical tank body with an effective height of 8 to 12 m, and the lower part is an ozone oxidation unit, the upper part is a biofilm unit, and the biological fillers inside the biofilm unit are arranged in multiple layers; or, the integrated device is a square tank body with an effective height of preferably 4 to 8 m and is horizontally divided into grids, wherein the lower part of the first grid is the ozone oxidation unit (1) and the rest are the biofilm units (1); or, the integrated device is a circular or elliptical tank body with an effective height of 4 to 8 m and is divided into inner and outer grids, wherein the inner circle is the ozone oxidation unit (1) and the outer circle is the biofilm unit (2).

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