A system and cavitator for treating organic waste gas VOCs

Abstract

The present invention relates to a system and cavitator for treating organic waste gas VOCs, comprising a treatment chamber, wherein the treatment chamber is provided with a waste gas inlet, and the treatment chamber is used to absorb the waste gas entering from the waste gas inlet into water or saturated absorption liquid in the treatment chamber; the outlet of the treatment chamber is connected to an ozone generator, and the ozone generator is used to generate ozone micro-nano bubbles to act on the saturated absorption liquid; the ozone generator is connected to a cavitator, and the cavitator is used to break the ozone micro-nano bubbles generated by the ozone generator; the output end of the cavitator is connected to the input port of the treatment chamber. The purpose is to absorb the organic waste gas by water or aqueous absorption liquid, and to degrade and destroy the organic volatile gas dissolved in the water by using ozone micro-bubble water in coordination with a catalyst and a cavitator, so that the absorption liquid is continuously circulated and regenerated, and its absorption treatment effect is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of disinfection and sterilization, and specifically relates to a system and a cavitator for treating organic waste gas VOCs. Background Art

[0002] Volatile organic compounds (VOCs) emitted by modern industry seriously endanger human health and have become the main air pollutants. The types of VOCs emitted by industries such as spraying and plastic processing mainly include benzene, esters, ethers, and aldehydes, which belong to the category of low-concentration (<300mg / m3) VOCs emission pollutants. In my country, there are many coating and plastic processing enterprises, which are scattered and emit irregularly. In the production process, a large amount of VOCs are directly emitted into the air, causing air pollution.

[0003] At present, the main method for recovering solvents in waste gas treatment is the segmented condensation recovery method. This method consumes a lot of energy, has a complex process, and has high requirements for the removal process technology of VOCs with complex components. In addition, the equipment and cost invested in the treatment of low-concentration and low-boiling-point volatile components have increased dramatically. The industry urgently needs other safe and efficient technologies to replace them. The treatment methods for impurity VOCs are mainly divided into chemical destruction and physical adsorption (absorption). Among them, combustion method, catalytic oxidation method, and biological method belong to chemical destruction methods, which can oxidize VOCs into carbon dioxide and water to achieve the purpose of purifying waste gas; however, in the actual treatment process, due to the insufficient VOC concentration and too fast flow rate, the chemical destruction process reaction is insufficient or the energy consumption is too high, which seriously affects the VOC chemical destruction treatment effect; therefore, chemical destruction often needs to be combined with physical methods to treat VOCs. Physical methods play a role in increasing the VOC concentration or prolonging the chemical destruction treatment time, thereby improving the chemical destruction treatment The purification effect of VOC.

[0004] Existing physical absorption methods can be divided into two categories: solid absorption method and liquid absorption method according to different adsorption materials. Among them, solid absorption mainly adopts activated carbon absorption, but this method has the problems of low adsorption saturation, difficult regeneration, high operating cost, and easy damage during transportation. The liquid absorption method mainly adopts high-boiling point organic solvent as absorbent. This method can effectively purify hydrophobic VOCs with similar polarity. Compared with activated carbon adsorption, it has the advantages of large absorption capacity, easy regeneration, long life, simple operation process, etc. It is also a method used more in the prior art. Patent CN103537171A adopts a method of mixing water and oil phase, and adding surfactant to prepare emulsion or microemulsion as absorption liquid, thereby reducing cost and improving safety, and maintaining good VOC absorption capacity. However, the oil-water mixed absorption liquid exhibits a stable emulsion state due to the large amount of surfactants it contains. The physical oil-water separator cannot effectively separate it. Chemical reagents must be added first to break the emulsion, and then the oil phase must be separated to achieve regeneration of the oil phase. This results in a complicated recovery process, high cost, difficult regeneration, and secondary pollution. This also limits the large-scale application of the oil-water mixed absorption liquid. Summary of the invention

[0005] In order to overcome the difficulty in separating the oil-water absorption liquid in the existing waste gas treatment, the present invention provides a system for treating organic waste gas VOCs, which absorbs the organic waste gas through water or aqueous absorption liquid, and degrades and destroys the organic volatile gases dissolved in the water through ozone microbubble water, a catalytic converter and a cavitator, so that the absorption liquid is continuously circulated and regenerated, thereby prolonging its absorption treatment effect.

[0006] The technical solution adopted by the present invention is: a system for treating organic waste gas (VOCs), comprising a treatment chamber, wherein a waste gas inlet is arranged on the treatment chamber, and the treatment chamber is used to absorb the waste gas entering from the waste gas inlet into water or saturated absorption liquid in the treatment chamber; the outlet of the treatment chamber is connected to an ozone generator, and the ozone generator is used to generate ozone micro-nano bubbles to act on the saturated absorption liquid; the ozone generator is connected to a cavitator, and the cavitator is used to break the ozone micro-nano bubbles generated by the ozone generator; the output end of the cavitator is connected to the input port of the treatment chamber.

[0007] Preferably, the cavitator comprises a cavitator inlet, a cavitator outlet and a cone, the small radius ends of the two cones are connected, and the axis of the cavitator inlet is perpendicular to the tangent of the cone.

[0008] Preferably, the diameter of the large radius end of the cone is 2-5 times the diameter of the cavitator inlet, the angle between the side of the cone and the axis of the cone is not greater than 37°, and the diameter of the small radius end of the cone is not greater than 1 / 10 of the diameter of the large radius end of the cone.

[0009] Preferably, the ozone generator is an ozone water machine, a catalytic oxidation unit is connected between the ozone generator and the cavitator, and a catalyst for degrading exhaust gas is arranged in the catalytic oxidation unit.

[0010] Preferably, the catalyst is a Fe-Co molecular sieve catalyst.

[0011] Preferably, the input port of the processing chamber is connected to a spray pipe, and a plurality of spray heads are arranged on the spray pipe, and the spray direction of the spray heads is toward the direction of the exhaust gas inlet.

[0012] Preferably, an absorption tank is provided in the processing chamber, a saturated absorption liquid is provided in the absorption tank, the outlet is provided on the absorption tank, the spray head is provided above the absorption tank, and the exhaust gas inlet is located between the spray head and the absorption tank; a demisting layer is provided above the spray head, the size of the demisting layer is comparable to the inner cavity size of the processing chamber, and the demisting layer is used to absorb moisture in the air in the processing chamber.

[0013] Preferably, the processing chamber is provided with an air outlet, the air outlet is communicated with the photocatalyst through a pipeline, the photocatalyst is connected with an activated carbon box, and the activated carbon box is connected with the exhaust port through a pipeline.

[0014] A cavitator for treating organic waste gas (VOCs), comprising a cavitator inlet, a cavitator outlet and a cone, wherein the small radius ends of two cones are connected, and the axis of the cavitator inlet is perpendicular to the tangent of the cone.

[0015] Preferably, the diameter of the large radius end of the cone is 2-5 times the diameter of the cavitator inlet, the angle between the side of the cone and the axis of the cone is not greater than 37°, and the diameter of the small radius end of the cone is not greater than 1 / 10 of the diameter of the large radius end of the cone.

[0016] The present invention has the following beneficial effects:

[0017] 1) The present invention absorbs organic waste gas through water or aqueous saturated absorption liquid, and then degrades the organic waste gas through ozone microbubbles generated by the ozone water machine, which move from the large radius end to the small radius end through the cavitator, thereby increasing the flow rate and water flow impact force. The cavitation force of the cavitator causes the ozone microbubbles to be instantly annihilated and a large number of highly active hydroxyl free radicals are generated at the steam-water interface. The highly active hydroxyl free radicals once again degrade the pollutants in the wastewater. As a result, most of the pollutants are degraded into inorganic precipitation mineralization, carbon dioxide and water;

[0018] 2) The cavitator of the present invention adopts a vertical inlet for entry, and the axis of the inlet is perpendicular to the tangent of the cone on the cavitator, so as to ensure that the water mixed with ozone microbubbles can generate a large impact force after entering the cavitator, and then the water flows through the position where the small radius end of the cone is connected in a swirling manner. At this time, the pressure is doubled, which can be increased to 5-200 times the pressure when the water flows into the cavitator. The increase in flow rate and the increase in pressure cause further squeezing, forcing a large number of ozone microbubbles to burst, thereby releasing the ozone therein and generating a large number of hydroxyl free radicals; the unique spindle-shaped structure of the cavitator can maximize the force, high temperature, and impact flow generated when the bubbles burst instantly, thereby promoting the destruction of organic matter in the solution and achieving a higher treatment efficiency and treatment capacity for organic matter.

[0019] 3) The water or saturated absorption liquid in the device of the present invention can be recycled and reused. After the organic waste gas is degraded, the water or saturated absorption liquid that has undergone secondary degradation is transported to the spray head through a water pump and sprayed out from the spray head. The sprayed water or saturated absorption liquid is then fully exchanged and absorbed with the organic waste gas entering from the waste gas inlet, thereby realizing recycling and reuse;

[0020] 4) The small amount of organic waste gas that has not been effectively absorbed and the treated tail gas, after passing through the demisting layer to remove most of the water vapor therein, enter the photocatalyst. In the photocatalyst, the low-concentration VOC gas contained in the tail gas is completely degraded into carbon dioxide and water through photocatalytic reaction, and a small amount of residual ozone can also be degraded; finally, the tail gas that has been basically treated is passed through the activated carbon box, and the impurities and odors contained therein are filtered out through the activated carbon adsorption effect, so as to achieve tail gas emission standards;

[0021] 5) The present invention adds a catalytic oxidation unit between the ozone water machine and the cavitator, and improves the degradation effect of the exhaust gas through the synergy of ozone and the catalyst, so that after entering the cavitator, the ozone microbubbles burst, and the organic matter contained in the water is quickly oxidized under the synergistic effect of hydroxyl free radicals and the catalyst, further improving the degradation effect of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the cavitator.

[0025] In the figure: 1-absorption tank; 2-ozone generator; 3-catalytic oxidation unit; 4-cavitator; 5-water pump; 6-spray head; 7-demist layer; 8-waste gas inlet; 9-gas outlet; 10-photocatalyst; 11-activated carbon box; 12-exhaust port; 13-treatment chamber; 14-inlet; 15-outlet; 16-spray pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] A system for treating organic waste gas (VOCs), comprising a treatment chamber 13, wherein the treatment chamber 13 is provided with a waste gas inlet 8, and the organic waste gas is directly introduced into the treatment chamber 13 from the waste gas inlet 8 for waste gas absorption, and the treatment chamber 13 is used to absorb the waste gas entering from the waste gas inlet 8 into water or aqueous saturated absorption liquid in the treatment chamber 13; the outlet 15 of the treatment chamber 13 is connected to an ozone generator 2, and the ozone generator 2 is used to generate ozone micro-nano bubbles to act on the saturated absorption liquid; the ozone generator 2 is connected to a cavitator 4, and the cavitator 4 is used to break the ozone micro-nano bubbles generated by the ozone generator 2; the output end of the cavitator 4 is connected to an input port 14 of the treatment chamber 13. It can be understood that after the exhaust gas enters the treatment chamber 13 from the exhaust gas inlet 8, it is absorbed by the saturated absorption liquid, and then is sucked into the ozone generator 2 through the water pump 5. The ozone generator 2 produces a large amount of ozone, which is mixed with the wastewater for primary degradation, and then enters the cavitator 4 through the booster water pump. The cavitation force of the cavitator 4 causes the remaining ozone microbubbles to be instantly annihilated and a large amount of highly active hydroxyl free radicals are generated at the steam-water interface. The highly active hydroxyl free radicals again degrade the pollutants in the wastewater; the degraded wastewater is again introduced into the treatment chamber 13, the liquid is reused, and the gas is discharged from the gas outlet 9 of the treatment chamber 13.

[0028] The cavitator 4 includes a cavitator inlet 41, a cavitator outlet 42 and a cone 43. The cavitator inlet 41, the cavitator outlet 42 and the cone 43 are connected to form a channel through which liquid can flow. The small radius ends of the two cones 43 are connected, and the axis of the cavitator inlet 41 is perpendicular to the tangent of the cone 43. When the liquid enters from the cavitator inlet 41, it directly hits the side wall of the cone 43, thereby forming a large impact force. After the impact is completed, a vortex is formed and gradually flows to the small radius end of the cone 43. At the small radius end of the cone 43, due to the narrowing of the passage path, the pressure increases again while the speed increases, thereby forcing the ozone bubbles to burst.

[0029] In this embodiment, one implementation of the cavitator 4 is that the diameter of the large radius end of the cone 43 is 2-5 times the diameter of the cavitator inlet 41, preferably 4 times in this embodiment, the angle between the side of the cone 43 and the axis of the cone 43 is not greater than 37°, the diameter of the small radius end of the cone 43 is not greater than 1 / 10 of the diameter of the large radius end of the cone 43, and the internal water pressure is ≥0.2 MPa.

[0030] The ozone generator 2 is an ozone water machine, which is a prior art and will not be described in detail here. A catalytic oxidation unit 3 is connected between the ozone generator 2 and the cavitator 4, and a catalyst for degrading exhaust gas is arranged in the catalytic oxidation unit 3.

[0031] The catalyst is a Fe-Co molecular sieve catalyst. The preparation process of the Fe-Co molecular sieve catalyst is as follows: immerse the molecular sieve in a sodium hydroxide solution with a concentration of 0.15 mol / L, shake it evenly at 50°C for 2 hours, filter it, and then wash it with deionized water until it is neutral. Immerse it in 9 mL of a mixed aqueous solution of iron nitrate and cobalt nitrate, ultrasonicate it at room temperature for 30 minutes, oscillate it for 2 hours, dry it at 110°C, roast it at 550°C for 4 hours, and then cool it down to be successfully prepared. The synergistic effect of the catalyst and ozone on the wastewater can further improve the efficiency of degradation.

[0032] In order to ensure the absorption of waste gas by saturated absorption liquid, a spray pipe 16 is connected to the input port 14 of the processing chamber 13. The length of the spray pipe 16 is equivalent to the length of the processing chamber. Several spray heads 6 are arranged on the spray pipe 16. Several spray heads 6 are evenly distributed on the spray pipe 16. The spray direction of the spray head 6 is toward the direction of the waste gas inlet 8.

[0033] An absorption pool 1 is arranged in the treatment chamber 13, water or saturated absorption liquid is arranged in the absorption pool 1, the outlet 15 is arranged on the absorption pool, the spray head 6 is arranged above the absorption pool 1, and the waste gas inlet 8 is located between the spray head 6 and the absorption pool 1; a demisting layer 7 is arranged above the spray head 6, the size of the demisting layer 7 is equivalent to the size of the inner cavity of the treatment chamber 13, and the demisting layer 7 is used to absorb moisture in the air in the treatment chamber 13. The waste gas inlet 8 is located between the spray head 6 and the absorption pool 1. When the waste gas enters from the waste gas inlet 8, most of the waste gas can be absorbed into the water or saturated absorption liquid after being sprayed by the spray head 6, and the droplets fall into the absorption pool 1 due to gravity, and then undergo subsequent degradation treatment.

[0034] The treatment chamber 13 is provided with an outlet 9. The wastewater sprayed from the spray head 6 and the liquid absorb the waste gas entering from the waste gas inlet 8 again and then enter the absorption tank 1. The degraded gas is discharged from the outlet 9. The outlet 9 is connected with the photocatalyst 10 through a pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the exhaust gas is completely degraded into carbon dioxide and water through a photocatalytic reaction. The photocatalyst 10 can also decompose ozone to prevent ozone overflow. The photocatalyst 10 is connected to the activated carbon box 11, and the activated carbon box 11 is connected to the exhaust port 12 through a pipeline. Impurities and odors contained therein are filtered out through the adsorption action of the activated carbon, thereby achieving exhaust gas emission standards.

[0035] Embodiment 1

[0036] The saturated absorption liquid is sucked by the water pump 5 and enters the ozone generator 2 (ozone water machine), where a large number of ozone microbubbles are generated inside the machine and mixed with the wastewater, and then enter the catalytic oxidation unit 3 together. Under the synergistic effect of ozone and the catalyst, the ozone microbubbles burst and the organic matter contained in the water is rapidly oxidized under the synergistic effect of the catalyst. The wastewater after catalytic oxidation is pressurized by a booster pump to 0.2Mpa again and enters the cavitator 4. The treated wastewater is transported to the spray head 6 by the water pump. At the same time, the saturated absorption liquid sprays down and fully exchanges gas and liquid with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13 for absorption. After the treated tail gas passes through the demisting layer 7 to remove most of the mixed water vapor, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the tail gas is degraded into carbon dioxide and water through a photocatalytic reaction. Finally, the tail gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out by the activated carbon adsorption.

[0037] Embodiment 2

[0038] The saturated absorption liquid is sucked by the water pump 5 and enters the ozone generator 2 (ozone water machine), where a large number of ozone microbubbles are generated inside the machine and mixed with the wastewater, and then enter the catalytic oxidation unit 3 together. Under the synergistic effect of ozone and the catalyst, the ozone microbubbles burst and the organic matter contained in the water is rapidly oxidized under the synergistic effect of the catalyst. The wastewater after catalytic oxidation is pressurized by 0.5Mpa by the booster pump again and enters the cavitator 4. The cavitation force of the cavitator 4 causes the remaining ozone microbubbles to be instantly annihilated and a large number of highly active hydroxyl radicals are generated at the steam-water interface. The highly active hydroxyl radicals once again degrade the pollutants in the wastewater for a second time. As a result, most of the pollutants are degraded into inorganic precipitation mineralization, carbon dioxide and water. The treated wastewater is transported to the spray head 6 by the water pump. At the same time, the saturated absorption liquid sprays down and is fully gas-liquid exchanged and absorbed with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13. After the treated exhaust gas passes through the demisting layer 7 to remove most of the mixed water vapor therein, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the exhaust gas is degraded into carbon dioxide and water through a photocatalytic reaction. Finally, the exhaust gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out through the activated carbon adsorption effect.

[0039] Comparative Example 1

[0040] The saturated absorption liquid is sucked by the water pump 5 and enters the ozone generator 2 (ozone water machine), where a large number of ozone microbubbles are generated inside the machine and mixed with the wastewater, and then enter the catalytic oxidation unit 3 together. Under the synergistic effect of ozone and the catalyst, the ozone microbubbles burst and the organic matter contained in the water is rapidly oxidized under the synergistic effect of the catalyst. The treated wastewater is transported to the spray head 6 by the water pump. At the same time, the saturated absorption liquid sprays down and fully exchanges gas and liquid with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13 for absorption. After the treated tail gas passes through the demisting layer 7 to remove most of the mixed water vapor, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the tail gas is degraded into carbon dioxide and water through the photocatalytic reaction. Finally, the tail gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out by the activated carbon adsorption.

[0041] Comparative Example 2

[0042] The saturated absorption liquid is pumped and pressurized to 0.2Mpa by the water pump 5 and then enters the cavitator 4. After passing through the cavitator 4, it is transported to the spray head 6 by the water pump 5, and the saturated absorption liquid sprays down and fully exchanges gas and liquid with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13 for absorption. After the treated tail gas passes through the demisting layer 7 to remove most of the mixed water vapor, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the tail gas is degraded into carbon dioxide and water through a photocatalytic reaction. Finally, the tail gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out by the activated carbon adsorption.

[0043] Comparative Example 3

[0044] The saturated absorption liquid is sucked by the water pump 5 and enters the ozone generator 2 (ozone water machine), where a large amount of ozone microbubbles are generated inside the machine and mixed with the wastewater, and then enter the cavitator 4 after being pressurized to 0.2Mpa by the booster water pump. The treated wastewater is transported to the spray head 6 by the water pump, and at the same time, the saturated absorption liquid sprays down and fully exchanges gas and liquid with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13 for absorption. After the treated exhaust gas passes through the demisting layer 7 to remove most of the mixed water vapor, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the exhaust gas is degraded into carbon dioxide and water through a photocatalytic reaction. Finally, the exhaust gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out by the activated carbon adsorption.

[0045] Comparative Example 4

[0046] The saturated absorption liquid is sucked by the water pump 5 and enters the ozone generator 2 (ozone water machine), where a large number of ozone microbubbles are generated inside the machine and mixed with the wastewater, and then enter the catalytic oxidation unit 3 together. Under the synergistic effect of ozone and the commercially available ZSM-5 iron-manganese catalyst, the ozone microbubbles burst and oxidize the organic matter contained in the water under the synergistic effect of the catalyst. The wastewater after catalytic oxidation is pressurized by 0.2Mpa by the booster water pump again and enters the cavitator 4. The treated wastewater is transported to the spray head 6 by the water pump. At the same time, the saturated absorption liquid sprays down and fully exchanges gas and liquid with the organic waste gas entering from the waste gas inlet 8 in the treatment chamber 13 for absorption. After the treated tail gas passes through the demisting layer 7 to remove most of the mixed water vapor, it enters the photocatalyst 10 through the pipeline. In the photocatalyst 10, the low-concentration VOC gas contained in the tail gas is degraded into carbon dioxide and water through the photocatalytic reaction. Finally, the tail gas passes through the activated carbon box 11, and the impurities and odors contained therein are filtered out by the activated carbon adsorption.

[0047]

[0048] It can be seen from the above data that the scheme described in Example 2 is used to purify the organic waste gas, and its purification efficiency is the highest within 1 hour, the circulating water COD value maintains the lowest concentration, and the tail gas emission concentration reaches more than 84.1%, which is maintained for a long time. The treatment effect of low-concentration waste gas is relatively ideal. It is the best embodiment of the present invention. The scheme described in Example 1 is used to purify the organic waste gas, and its purification efficiency reaches 79.6% within 1 hour, and the circulating water COD value is always maintained at a low level, which is the suboptimal embodiment of the present invention.

[0049] The scheme described in Comparative Example 1 does not use the cavitator 4 to synergistically degrade and treat wastewater, resulting in the continuous accumulation of VOCs concentration in the circulating water, which ultimately affects the efficiency of tail gas absorption by the absorption liquid. Comparative Example 2 does not use an ozone water machine, but uses a catalytic oxidation unit to degrade and treat wastewater, which also results in the continuous accumulation of VOCs concentration in the circulating water, and the circulation absorption effect is poor. Comparative Example 3 does not use a synergistic degradation ozone catalyst, and Comparative Example 4 uses a commercially available common catalyst, both of which reduce the efficiency of the ozone catalytic oxidation reaction in the system, and both indirectly affect the final effect of exhaust gas treatment to varying degrees.

[0050] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to be limiting of the present invention. As long as they are within the spirit and scope of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A system for treating organic waste gas VOCs, characterized by: The invention comprises a processing chamber (13), wherein the processing chamber (13) is provided with a waste gas inlet (8), and the processing chamber (13) is used to absorb the waste gas entering from the waste gas inlet (8) into water or saturated absorption liquid in the processing chamber (13); the outlet (15) of the processing chamber (13) is connected to an ozone generator (2), and the ozone generator (2) is used to generate ozone micro-nano bubbles to act on the saturated absorption liquid; the ozone generator (2) is connected to a cavitator (4), and the cavitator (4) is used to break the ozone micro-nano bubbles generated by the ozone generator (2); the cavitator (4) The output end of the cavitator (4) is in communication with the input port (14) of the processing chamber (13); the cavitator (4) comprises a cavitator inlet (41), a cavitator outlet (42) and a cone (43); the small radius ends of the two cones (43) are connected; the axis of the cavitator inlet (41) is perpendicular to the tangent of the cone (43); the ozone generator (2) is an ozone water machine; a catalytic oxidation unit (3) is connected between the ozone generator (2) and the cavitator (4); a catalyst for degrading exhaust gas is arranged in the catalytic oxidation unit (3); the catalyst is a Fe-Co molecular sieve catalyst.

2. The system for treating organic waste gas VOCs according to claim 1, characterized in that: The diameter of the large radius end of the cone (43) is 2-5 times the diameter of the cavitator inlet (41), the angle between the side surface of the cone (43) and the axis of the cone (43) is not greater than 37°, and the diameter of the small radius end of the cone (43) is not greater than 1 / 10 of the diameter of the large radius end of the cone (43).

3. The system for treating organic waste gas VOCs according to claim 1, characterized in that: The input port (14) of the processing chamber (13) is connected to a spray pipe (16), and a plurality of spray heads (6) are arranged on the spray pipe (16), wherein the spray direction of the spray heads (6) is toward the direction of the exhaust gas inlet (8).

4. The system for treating organic waste gas VOCs according to claim 3 is characterized in that: An absorption tank (1) is arranged in the processing chamber (13), a saturated absorption liquid is arranged in the absorption tank (1), the outlet (15) is arranged on the absorption tank (1), the spray head (6) is arranged above the absorption tank, and the waste gas inlet (8) is located between the spray head (6) and the absorption tank (1); a demisting layer (7) is arranged above the spray head, the size of the demisting layer (7) is comparable to the size of the inner cavity of the processing chamber (13), and the demisting layer (7) is used to absorb moisture in the air in the processing chamber (13).

5. The system for treating organic waste gas VOCs according to claim 1, characterized in that: The processing chamber (13) is provided with an air outlet (9), the air outlet (9) is connected to a photocatalyst (10) through a pipeline, the photocatalyst (10) is connected to an activated carbon box (11), and the activated carbon box (11) is connected to an exhaust port (12) through a pipeline.

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