Ozone catalytic oxidation and degassing wastewater advanced treatment system and process

Abstract

The invention relates to the technical field of wastewater advanced treatment and zero emission, in particular to an ozone catalytic oxidation and degassing wastewater advanced treatment system and process. The wastewater treatment system comprises an ozone catalytic oxidation system and an activated carbon degassing system. The advanced wastewater treatment process comprises the following steps: conveying wastewater to a catalytic ozonation pond, adding ozone into the pond in stages, enabling the wastewater to enter the catalytic ozonation pond again through a secondary mixing device, and carrying out catalytic oxidation reaction under the action of ozone; pretreated sewage automatically flows into an activated carbon filter tank, an activated carbon loaded manganese dioxide catalyst is adopted as a filter material in the activated carbon filter tank, and meanwhile, an ultraviolet or near-infrared irradiation device is arranged and cooperates with activated carbon and electromagnetic waves to treat residual ozone. The ozone catalytic oxidation and activated carbon degassing combined advanced wastewater treatment process adopted by the invention is advanced and mature, small in occupied area, low in operation cost, simple in process, high in automation degree and extremely low in sludge yield, and can realize comprehensive and efficient removal of pollutants in high-salinity wastewater; valuable technical support and engineering instance reference can be provided in the field of wastewater advanced treatment and zero emission.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater deep treatment, and in particular to a wastewater deep treatment system and process for ozone catalytic oxidation and degassing. Background Art

[0002] In order to cope with the water shortage problem caused by the rapid development of my country's industry, the zero discharge process of wastewater has become a hot topic in the field of wastewater treatment. The effective removal of refractory organic matter is the main problem faced by zero discharge of industrial wastewater and upgrading of sewage treatment plants. The common characteristics of these refractory organic matter are long molecular chains, high chemical bond energy, stable chemical structure, and difficulty in direct biochemical degradation. At present, the removal method of refractory organic matter mainly adopts advanced oxidation method. Commonly used methods include ozone catalytic oxidation method, Fenton oxidation method, photocatalytic oxidation method, etc. Advanced oxidation method mainly uses the strong oxidizing effect of hydroxyl radicals to remove refractory organic matter in sewage. The redox potential of hydroxyl radicals is E0=2.8ev. Under the extremely high oxidation potential, most refractory organic matter can undergo chain breaking reaction and form short-chain organic matter or be directly oxidized to CO2 and H2O. How to efficiently and massively produce hydroxyl radicals is the main indicator for judging the quality of advanced oxidation technology. Ozone catalytic oxidation has a good treatment effect on difficult-to-degrade organic matter, and has the advantages of being green and free of secondary pollution. However, the ozone catalytic oxidation method has problems such as low ozone dissolution efficiency in water, low ozone utilization rate, and the impact of ozone residue on subsequent processes. These have limited the further widespread application of the ozone catalytic oxidation method. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] In order to overcome the practical application difficulties of the above-mentioned ozone catalytic oxidation technology, a wastewater deep treatment system and process for ozone catalytic oxidation and degassing is provided. The system can improve the utilization rate of ozone and solve the problem of the influence of residual ozone on subsequent units.

[0005] The purpose of the present invention is to provide an oxygen catalytic oxidation and degassing wastewater deep treatment system, which comprises: an ozone catalytic oxidation system and an activated carbon degassing system.

[0006] Furthermore, the ozone catalytic oxidation system is provided with four-stage ozone catalytic oxidation pools, each of which has the same structure and is connected in sequence for multi-stage catalytic oxidation; a multi-element palladium catalyst and its accessories are provided in the pool body; the loading height of the catalyst is 1-3m; a special vapor dissolving device, a centrifugal pump and a secondary mixing device for ozone addition are provided in the system;

[0007] Further, the wastewater is transported to the ozone catalytic oxidation tank, and ozone is added in sections in the tank. A centrifugal pump is set in each section. The pump takes sewage from a specific position in the tank and pumps it into a special vapor dissolving device. A negative pressure is formed in the special vapor dissolving device to suck the ozone. Finally, it passes through a secondary mixing device and enters the ozone catalytic oxidation tank again to carry out a catalytic oxidation reaction under the action of ozone.

[0008] Furthermore, the special vapor dissolving device is an ejector, and an electromagnetic coil and an ultrasonic transducer are arranged on the outer wall, and the electromagnetic coil and the ultrasonic transducer are arranged at intervals.

[0009] Furthermore, the frequency range of the ultrasonic wave is 50kHz-8.5MHz, preferably 3MHz, 5MHz.

[0010] Further, the secondary mixing device is a guide plate or a filter brick;

[0011] The electromagnetic coil uses the magnetochemical effect to perform a high-frequency electromagnetic field instantaneous shearing action on the cluster structure of water molecules, organic molecules, and ions in the sewage, breaking the original cluster structure of each microscopic form in the sewage, breaking the hydration and association effects of water molecules and organic molecules and ions, and changing the physical, chemical, molecular mechanical and other properties of the sewage, which are manifested as follows: (1) The water molecule clusters in the sewage become smaller, the tension becomes greater, the viscosity becomes smaller, the permeability increases, and the fluidity becomes better, which is conducive to the dissolution of gas phase molecules; (2) The molecular clusters of organic matter, ions and water molecules in the sewage become smaller, and the organic molecules are more easily in contact with the oxidant. At the same time, the polar organic molecules are elongated, and the external charge of the organic molecules is redistributed, which is conducive to the next step of reaction with the oxidant; (3) The adsorption capacity of organic molecules and ions on the surface of the solid-phase catalyst is reduced, thereby improving the interfacial reaction efficiency of the solid-phase catalysis.

[0012] Using the ejector for hydraulic cavitation, the wastewater formed by ultrasonic cavitation by the ultrasonic transducer enters the ejector, and further enters the ejector structure for hydraulic cavitation. Hydraulic cavitation produces cavitation by changing the pressure fluctuation caused by the flow rate of the liquid medium, while ultrasonic cavitation uses ultrasound to produce cavitation effect in the liquid. The combination of the two can produce a large number of cavitation bubbles, enhance the oxidation reaction and physical fragmentation effect, and make the number and intensity of cavitation bubbles increased.

[0013] The electromagnetic coil changes the cluster structure of water molecules, organic pollutant molecules, and ion atmospheres in the sewage through the action of the electromagnetic shear field, and changes the physical, chemical, molecular mechanics and other properties of the treated sewage, thereby achieving the purpose of increasing the ozone solubility, accelerating the reaction time of ozone and organic pollutants, and improving the solid-phase catalytic efficiency. At the same time, under the action of the electromagnetic shear field and the multi-element palladium catalyst, the ozone-containing sewage is directly stimulated to produce hydroxyl free radicals. Under the strong oxidizing effect of the hydroxyl free radicals, the chemical bonds of long-chain organic matter are broken to generate short-chain easily degradable organic matter, which is directly oxidized into the final products CO2 and H2O and other chemical forms of final products in this process, thereby achieving the purpose of COD emission meeting the standards.

[0014] Activated carbon degassing system, the activated carbon degassing system is provided with an activated carbon degassing tank and a backwashing device; the pre-treated sewage flows by gravity into the activated carbon filter tank, and the activated carbon filter tank is mainly used to degas the effluent from the ozone catalytic oxidation tank to prevent ozone from entering the subsequent process system to cause damage and protect the safe operation of the subsequent treatment system.

[0015] Furthermore, an irradiation device is provided inside the activated carbon filter tank, and irradiation is performed using ultraviolet rays or near-infrared rays;

[0016] Furthermore, the filter material is activated carbon loaded with manganese dioxide, and the specific surface area is preferably 400-800m 2 / g, preferably 600m 2 / g.

[0017] During the degassing process, when the gas-containing liquid passes through the activated carbon adsorption tank, the gas molecules are adsorbed onto the surface of the activated carbon. Physical adsorption is due to the intermolecular forces on the surface of the activated carbon, while chemical adsorption is due to the chemical reaction between the functional groups on the surface of the activated carbon and the gas molecules. Through these two adsorption methods, the gas molecules are fixed in the pores of the activated carbon, thereby achieving the purpose of degassing.

[0018] Furthermore, the activated carbon is loaded with manganese dioxide, which acts as a catalyst for catalyzing the decomposition of ozone into oxygen, thereby accelerating the removal of residual ozone.

[0019] Furthermore, an irradiation device is provided inside the activated carbon filter tank, which utilizes ultraviolet or near-infrared ray irradiation in combination with manganese dioxide to accelerate the ozone decomposition rate;

[0020] Furthermore, the activated carbon degassing tank is divided into 4 compartments, each series can be operated independently, and the activated carbon backwashing adopts air flushing, air-water backwashing and water flushing; the filter material thickness is 2.0m, and the filtration rate is 8.7m / h;

[0021] The purpose of the present invention is to provide a wastewater deep treatment process of oxygen catalytic oxidation and degassing: the wastewater is transported to an ozone catalytic oxidation tank, ozone is added in sections in the tank, a centrifugal pump is arranged in each section, the pump takes sewage from a specific position in the tank and pumps it into a special vapor dissolving device, a negative pressure is formed in the special vapor dissolving device to suck ozone, and finally passes through a secondary mixing device and enters the ozone catalytic oxidation tank again to carry out catalytic oxidation reaction under the action of ozone;

[0022] Then, ozone catalytic oxidation is carried out, and the mixed sewage is put into the ozone catalytic oxidation tank to carry out catalytic oxidation reaction under the action of ozone and multi-element palladium catalyst;

[0023] The pre-treated sewage flows by gravity into the activated carbon filter. The main function of the activated carbon filter is to degas the effluent from the ozone catalytic oxidation tank to prevent ozone from entering the subsequent process system and causing damage, thereby protecting the safe operation of the subsequent treatment system.

[0024] Furthermore, the ozone dosage ratio of the four-stage ozone catalytic oxidation tank is 4:3:1:1;

[0025] Furthermore, the loading height of the catalyst is 1-3m; the ratio of the amount of ozone (O3) added to the amount of CODcr removed is preferably 1.2-3.0; the reaction time of the catalytic oxidation reaction is 0.5-2h;

[0026] Further, the inlet suspended solids concentration (SS) of the ozone catalytic oxidation system is less than 10 mg / L; the inlet pH of the ozone catalytic oxidation system is 6-9;

[0027] Furthermore, an irradiation device is provided inside the activated carbon filter tank, and irradiation is performed using ultraviolet rays or near-infrared rays;

[0028] Further, the near infrared ray has a wavelength range of 1000-1500 nm, preferably 1200-1300 nm near infrared;

[0029] Furthermore, the irradiation device is arranged at the bottom or the middle of the activated carbon filter tank;

[0030] Furthermore, the thickness of the filter material inside the activated carbon filter is 2.0 m, and activated carbon loaded with manganese dioxide is used as the filter material, and the specific surface area is preferably 400-800 m 2 / g, preferably 600m 2 / g, the loading amount of manganese dioxide on the activated carbon is 5-20%, preferably 13%;

[0031] Furthermore, a filter brick is provided at the bottom of the activated carbon filter as a supporting structure, the filter brick is an S-shaped filter brick, and an infrared irradiation device is provided inside the primary water distribution cavity.

[0032] Further, the reaction temperature of the activated carbon filter is 4°C-80°C, preferably 20-60°C, and further preferably 40°C, 48°C, and 50°C;

[0033] Furthermore, the hydraulic retention time of the activated carbon filter is 0.2-3 hours, preferably 0.5 hours.

[0034] Activated carbon degassing technology has the advantages of high efficiency, environmental protection, and economy. By rationally designing the structure of the degassing tank and selecting the appropriate type of activated carbon, efficient gas adsorption and degassing effects can be achieved. Activated carbon-loaded manganese dioxide catalyst is used as the filter material in the activated carbon filter. At the same time, an ultraviolet or near-infrared irradiation device is provided to coordinate with activated carbon and electromagnetic waves to treat residual ozone. By introducing oxygen vacancies, the ozone decomposition activity of the catalyst can be improved. Improve the regeneration performance and service life of the catalyst. Electromagnetic wave radiation can be combined with the catalyst to enhance its catalytic activity by photoexciting the catalyst, thereby more effectively decomposing ozone. The synergistic effect of manganese dioxide, activated carbon, and electromagnetic waves can significantly improve the treatment efficiency of residual ozone and enhance the stability and water resistance of the catalyst, which is of great significance for improving the practical application value of ozone treatment technology.

[0035] The deep treatment process has the following characteristics: 1. It adopts advanced and mature technology, occupies a small area, has low operating costs, is simple in process, has a high degree of automation, has a simple flow, and produces very little sludge. 2. Ozone catalytic oxidation has three proprietary technologies, which greatly improve the efficiency of sewage treatment compared with traditional ozone contact oxidation: (1) Jet dosing system: greatly increases the dissolution efficiency of ozone in water, improves the utilization rate of ozone, dissolves gas at low pressure, reduces the head of the water pump, saves electricity, and thus reduces operating costs. (2) Electromagnetic generator: changes the structure of water molecule clusters, increases the solubility of ozone in water, and makes it easier for difficult-to-degrade organic matter to be oxidized and removed. After the above technical improvements, the ozone utilization rate of electromagnetic advanced catalytic oxidation can reach 99%. (3) Activated carbon degassing technology uses the synergistic effect of manganese dioxide, activated carbon, and electromagnetic waves to significantly improve the treatment efficiency of residual ozone and enhance the stability and water resistance of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic flow diagram of a wastewater deep treatment system for oxygen catalytic oxidation and degassing provided by the present invention.

[0037] Figure 2 The present invention provides a schematic diagram of the structure of activated carbon filter bricks in a wastewater deep treatment system for oxygen catalytic oxidation and degassing.

[0038] Among them: 1. Centrifugal pump; 2. Special vapor dissolving device; 3. Secondary mixing device; 4. Anti-backflow device; 5. Tail gas destroyer; 6. Respirator; 7. Multi-element palladium catalyst; 8. Activated carbon; 9. S-type filter brick; 10. Primary water distribution chamber; 11. Irradiation device; DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation modes.

[0041] like Figure 1 As shown, a wastewater deep treatment system for oxygen catalytic oxidation and degassing includes: ozone is generated in an ozone preparation room, connected to a special vapor dissolving device 2 through a pipeline, and the pipeline is provided with an anti-backflow device 4. The ozone catalytic oxidation system is provided with four-stage ozone catalytic oxidation pools, each of which has the same structure and is connected in sequence for multi-stage catalytic oxidation; a multi-element palladium catalyst 7 and its accessories are provided in the pool body; wastewater is transported to the ozone catalytic oxidation pool, ozone is added in sections in the pool, and a centrifugal pump 1 is provided in each section. The pump takes sewage from a specific position in the pool and pumps it into the special vapor dissolving device 2, and negative pressure is formed in the special vapor dissolving device to suck ozone, and finally passes through a secondary mixing device 3, enters the ozone catalytic oxidation pool again, and performs catalytic oxidation reaction under the action of ozone; the special vapor dissolving device 2 is an ejector, and an electromagnetic coil and an ultrasonic transducer are provided on the outer wall, and the above-mentioned electromagnetic coil and ultrasonic transducer are arranged at intervals. The secondary mixing device 3 is a guide plate or a filter brick; the ozone catalytic oxidation tank is provided with a respirator 6 to ensure gas exchange and pressure balance, thereby enhancing the safety of the system. The activated carbon degassing tank is connected to an exhaust gas destroyer 5 to decompose the ozone in the exhaust gas to avoid the potential threat of ozone to the environment. The filter material used in the activated carbon degassing tank is activated carbon 8 loaded with manganese dioxide, and an S-type filter brick 9 is provided at the bottom of the activated carbon degassing tank. An irradiation device is provided inside the primary water distribution chamber 10 inside the S-type filter brick 9;

[0042] The wastewater deep treatment process by ozone catalytic oxidation will be further described below with reference to the accompanying drawings.

[0043] In one embodiment of the present invention, wastewater is transported to an ozone catalytic oxidation tank, and ozone is added in sections in the tank. A centrifugal pump 1 is provided in each section. The pump takes sewage from a specific position in the tank and pumps it into a special vapor dissolving device 2. The special vapor dissolving device 2 is preferably an ejector. The outer wall of the ejector is provided with an electromagnetic coil and an ultrasonic transducer, and the electromagnetic coil and the ultrasonic transducer are arranged at intervals. Negative pressure is formed in the special vapor dissolving device 2 to suck ozone, and finally enters the ozone catalytic oxidation tank again through a secondary mixing device 3, and performs a catalytic oxidation reaction under the action of ozone; then ozone catalytic oxidation is performed, and the mixed sewage is put into the ozone catalytic oxidation tank, and a catalytic oxidation reaction is performed under the action of ozone and a multi-element palladium catalyst 7; the pre-treated sewage flows into the activated carbon filter tank by gravity, and the activated carbon filter tank mainly functions to degas the effluent of the ozone catalytic oxidation tank to prevent ozone from entering the subsequent process system to cause damage and protect the safe operation of the subsequent treatment system. An S-type filter brick 9 is arranged at the bottom of the activated carbon filter tank. The wastewater passes through the primary water distribution chamber 10 inside the S-type filter brick 9 and flows upward into the activated carbon filter tank. An irradiation device is arranged inside the primary water distribution chamber 10 to promote the conversion of ozone in the wastewater into oxygen. Activated carbon loaded with manganese dioxide is used as the filter material. By introducing oxygen vacancies, the ozone decomposition activity of the catalyst can be improved. The regeneration performance and service life of the catalyst are improved. It can quickly and efficiently decompose medium and low concentration ozone into oxygen at room temperature. The irradiation device uses ultraviolet rays or near-infrared rays of 1200-1300nm to irradiate ozone. Under light excitation, ozone is first converted into singlet O2 and then into ground state O2. Electromagnetic wave radiation can synergize with the catalyst, and enhance its catalytic activity by light excitation of the catalyst, thereby decomposing ozone more effectively. . The synergistic effect of manganese dioxide, activated carbon and electromagnetic waves can significantly improve the treatment efficiency of residual ozone and enhance the stability and water resistance of the catalyst.

[0044] Embodiment 1:

[0045] The first phase of a sewage treatment plant in an industrial park in Sichuan Province treats the discharged production wastewater of a certain company, including production process wastewater, acid and alkali waste gas washing tower drainage and research and development experimental wastewater. The plant adopts the oxygen catalytic oxidation and degassing wastewater deep treatment process of the present invention. The design scale of this process section is Q d =10000m 3 / d, coefficient of variation K Z =1.1, Q = 458.3m 3 / h;

[0046] (1) Ozone catalytic oxidation pool and activated carbon pool

[0047] An ozone catalytic oxidation pool and an activated carbon pool are built together, with a total plane size of 38.3m×13.8m. The ozone dosage of the ozone catalytic oxidation pool is 100.0mg / L, divided into two series, each series can be operated independently, and ozone is added in four sections of baffles. The catalyst thickness is 0.5m, and the total residence time is 175min. The activated carbon degassing pool is divided into 4 grids, each series can be operated independently, and the activated carbon backwashing adopts air flushing, air-water backwashing and water flushing. The filter material thickness is 2.0m, and the filtration rate is 8.7m / h.

[0048] (2) Ozone generator room

[0049] The total plane size of the ozone generator room is 17.0m×12.0m; three 25kg / h ozone generators (2 in use and 1 in reserve) are used, the rated ozone concentration is 150mg / L (10.2wt%), and it is equipped with an exhaust gas destroyer, heat exchange system, ozone concentration meter, flow meter, ozone leakage meter, etc.

[0050] (3) Liquid oxygen station

[0051] The liquid oxygen station covers an area of ​​10.0m×6.0m; liquid oxygen tank V=80m 3 , supporting vaporizer and voltage stabilizing device, totaling 1 set.

[0052] The project was completed in June 2021, and water was started to be taken in for process commissioning and has been put into normal operation since then. The ozone catalytic oxidation unit and degassing unit facilities are operating stably, with good treatment effects, and the effluent quality meets the design standards. The original design inlet and outlet water indicators and operation results of the project are shown in Tables 1 and 2.

[0053] Table 1 Designed inlet and outlet water quality of this project (unit: mg / L)

[0054]

[0055] Table 2 Actual inlet and outlet water quality of this project (unit: mg / L)

[0056]

[0057] Embodiment 2:

[0058] In order to meet the reclaimed water effluent index, an industrial wastewater plant in Inner Mongolia adopted the wastewater deep treatment process of oxygen catalytic oxidation and degassing of the present invention. The design scale of the process section is: Q = 11040m 3 / d, design hourly flow rate Q = 460.0m 3 / h. Experimental research was carried out at the pilot site. The specific implementation process is as follows: (1) The sewage first enters the regulating water tank, where the water volume and water quality are balanced, and then it is lifted to the ozone catalytic oxidation tank by the lifting pump. (2) The effluent from the front unit enters the ozone catalytic oxidation tank, and ozone is added in sections in a baffled mode at each stage. (3) A centrifugal pump is installed in each section, and the pump takes water from a specific position in the pool and pumps it into a special vapor dissolving device, which forms a negative pressure to suck ozone. The sewage and ozone are efficiently mixed and fully contacted with the catalyst, and hydroxyl free radicals are stimulated to be produced under the action of the active components of the catalyst. Under the strong oxidizing action of hydroxyl free radicals, most of the difficult-to-degrade organic matter undergoes chain breaking reactions to form short-chain organic matter or is directly oxidized to CO2 and H2O. (4) The effluent from the ozone catalytic oxidation tank flows into the activated carbon degassing unit by gravity for degassing treatment to prevent the safe operation of the subsequent treatment system to protect ozone.

[0059] The pilot test of this project adopted a water volume of 500L / h, an ozone dosage of 170.0mg / L, an OC ratio of 2.6, and a total residence time of 120min. It can be seen from the pilot test data that the oxygen catalytic oxidation and degassing process of the present invention has a significant removal effect on COD in this type of sewage, the ozone catalytic oxidation and activated carbon degassing unit facilities operate stably, the treatment effect is good, and the effluent water quality meets the design standard. The original design of the inlet and outlet water quality indicators and operation results of the project are shown in Tables 3 and 4.

[0060] Table 3 Designed inlet and outlet water quality of this project (unit: mg / L)

[0061]

[0062] Table 4 Actual inlet and outlet water quality of the pilot test of this project (unit: mg / L)

[0063]

[0064] In summary, due to the adoption of the above technical scheme, according to an embodiment of the present invention, a wastewater deep treatment system and process of a combined technology of ozone catalytic oxidation and activated carbon degassing solves the problems of low dissolution efficiency of ozone in water, unstable number of free radicals, low ozone utilization rate, and residual ozone affecting subsequent units in the existing ozone catalytic oxidation process. The process is advanced and mature, with a small footprint, low operating cost, simple process, high degree of automation, simple process, and very little mud production. Through the water cavitation of the ejector combined with ultrasonic cavitation technology and the magnetochemical effect, the dissolution efficiency of ozone in water is greatly increased, the utilization rate of ozone is improved, the low-pressure gas is dissolved, the water pump head is reduced, and power consumption is saved, thereby reducing operating costs. By using this magnetochemical effect, the water molecule cluster structure is changed, the solubility of ozone in water is increased, and at the same time, the refractory organic matter is more easily oxidized and removed. After the above technical improvements, the ozone utilization rate of electromagnetic advanced catalytic oxidation can reach 99%. The technology disclosed in the present invention adopts a residual ozone treatment process, and uses an activated carbon-loaded manganese dioxide catalyst as a filter material. At the same time, an ultraviolet or near-infrared irradiation device is arranged in the activated carbon degassing system to coordinately treat the residual ozone with the activated carbon and electromagnetic waves. The synergistic effect of manganese dioxide, activated carbon and electromagnetic waves can significantly improve the treatment efficiency of the residual ozone and enhance the stability and water resistance of the catalyst, which is of great significance for improving the practical application value of the ozone treatment technology.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A wastewater deep treatment system with ozone catalytic oxidation and degassing, characterized in that: include: Ozone catalytic oxidation system, activated carbon degassing system; the ozone catalytic oxidation system is provided with four-stage ozone catalytic oxidation pools, each of which has the same structure and is connected in sequence for multi-stage catalytic oxidation; a multi-element palladium catalyst and its accessories are provided in the pool body; the filling height of the catalyst is 1-3m; a special vapor dissolving device, a centrifugal pump and a secondary mixing device for ozone addition are provided in the system; wastewater is transported to the ozone catalytic oxidation pool, ozone is added in sections in the pool, and a centrifugal pump is provided in each section. The pump takes sewage from a specific position in the pool and pumps it into the special vapor dissolving device, and negative pressure is formed in the special vapor dissolving device to suck ozone, and finally passes through the secondary mixing device and enters the ozone catalytic oxidation pool again to carry out catalytic oxidation reaction under the action of ozone; the special vapor dissolving device is an ejector, and an electromagnetic coil and an ultrasonic transducer are provided on the outer wall, and the above-mentioned electromagnetic coil and ultrasonic transducer are arranged at intervals; The activated carbon degassing system is provided with an activated carbon degassing tank and a backwashing device; the pre-treated sewage flows by gravity into the activated carbon filter tank, and an irradiation device is arranged inside the activated carbon filter tank for irradiation by ultraviolet rays or near-infrared rays.

2. The wastewater deep treatment system of ozone catalytic oxidation and degassing according to claim 1 is characterized in that: The ultrasonic frequency range of the ultrasonic transducer is 50kHz-8.5MHz, and the secondary mixing device is a guide plate or a filter brick.

3. The wastewater deep treatment system of ozone catalytic oxidation and degassing according to claim 1 is characterized in that: The activated carbon degassing tank is divided into 4 compartments, each series can be operated independently, and the activated carbon backwashing adopts air flushing, air-water backwashing or water flushing; the filter material thickness is 2.0m, and the filtration rate is 8.7m / h.

4. The wastewater deep treatment system of ozone catalytic oxidation and degassing according to claim 1 is characterized in that: The irradiation device is arranged at the bottom or the middle of the activated carbon filter tank.

5. The wastewater deep treatment system of ozone catalytic oxidation and degassing according to claim 4 is characterized by: A filter brick is arranged at the bottom of the activated carbon filter as a supporting structure. The filter brick is an S-shaped filter brick, and an irradiation device is arranged inside the primary water distribution cavity.

6. A wastewater deep treatment process with ozone catalytic oxidation and degassing, characterized in that: A wastewater deep treatment system comprising the ozone catalytic oxidation and activated carbon degassing combined technology as described in claims 1-5, further comprising the following process: transporting wastewater to an ozone catalytic oxidation tank, adding ozone in sections in the tank, providing a centrifugal pump in each section, pumping wastewater from a specific position in the tank into a special vapor dissolving device, forming a negative pressure in the special vapor dissolving device to suck ozone, and finally passing through a secondary mixing device to enter the ozone catalytic oxidation tank again; Then, ozone catalytic oxidation is carried out, and the mixed sewage is put into the ozone catalytic oxidation tank to carry out catalytic oxidation reaction under the action of ozone and multi-element palladium catalyst; The pre-treated sewage flows by gravity into the activated carbon filter, the main function of which is to degas the effluent from the ozone catalytic oxidation tank.

7. The wastewater deep treatment process of ozone catalytic oxidation and degassing according to claim 6, characterized in that: The ozone dosage ratio of the four-stage ozone catalytic oxidation pool is 4:3:1:1, and the catalyst loading height is 1-3m; the ratio of ozone (O3) dosage to CODcr removal is preferably 1.2-3.0; and the reaction time of the catalytic oxidation reaction is 0.5-2h.

8. The wastewater deep treatment process of ozone catalytic oxidation and degassing according to claim 6, characterized in that: An irradiation device is arranged inside the activated carbon filter tank, which uses ultraviolet rays or near-infrared rays for irradiation, and the wavelength range of the near-infrared rays used is 1000-1500nm.

9. The wastewater deep treatment process of ozone catalytic oxidation and degassing according to claim 6, characterized in that: The thickness of the filter material inside the activated carbon filter is 2.0m, and activated carbon loaded with manganese dioxide is used as the filter material, and the specific surface area is preferably 400-800m 2 / g, the loading amount of manganese dioxide on the activated carbon is 5-20%, and the reaction temperature of the activated carbon filter is 4°C-80°C.

10. The wastewater deep treatment process of ozone catalytic oxidation and degassing according to claim 6, characterized in that: A filter brick is arranged at the bottom of the activated carbon filter as a supporting structure. The filter brick is an S-shaped filter brick, and an infrared irradiation device is arranged inside the primary water distribution cavity.

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