System device and method for degrading antibiotic wastewater

Abstract

The invention discloses a system device and a method for degrading antibiotic wastewater. The system device comprises an air compressor, an ozone generator, a valve, a flow meter, a primary immersed rotary packed bed, a secondary immersed rotary packed bed, a tail gas processor, a sedimentation tank, a raw material pump and an antibiotic wastewater reservoir, a two-stage immersed rotary packed bed is used in the system device, so that a large amount of antibiotic wastewater is continuously treated under the condition of ensuring the degradation efficiency; the immersed rotating packed bed for antibiotic wastewater degradation in the system device can effectively reduce the bubble diameter and increase the bubble speed, so that the updating of the gas-liquid surface is enhanced; and a feasible new choice is provided for efficiently and deeply removing chloramphenicol in wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater degradation technology. Specifically, it relates to a system apparatus and method for the degradation of antibiotic wastewater. Background Technology

[0002] Antibiotics are commonly used to treat infectious diseases in humans and animals. However, their widespread use has also led to wastewater pollution problems. Numerous studies have shown that antibiotic-contaminated wastewater can cause antibiotic resistance in the human gut microbiota, resulting in weakened immunity, severe allergic reactions, and chronic toxicity in people who drink antibiotic-contaminated water over a long period. It can also have toxic effects on certain aquatic organisms. Therefore, wastewater containing antibiotics must undergo more stringent treatment procedures before being discharged into the environment.

[0003] Advanced oxidation technologies (AOCs) possess strong degradation capabilities for pollutants and have been widely used in wastewater treatment. AOCs include Fenton oxidation, photocatalytic oxidation, ozone oxidation, and electrochemical oxidation. Among these, ozone AOC offers advantages such as strong oxidation capacity, no secondary pollution, and environmental friendliness, meeting the technical needs of large-scale wastewater treatment. In ozone AOC, ozone and its generated active components (such as hydroxyl radicals) can efficiently degrade antibiotic wastewater. Currently, there is an urgent need for a technical solution capable of continuously and efficiently treating large quantities of antibiotic wastewater using ozone. Chinese patent application CN202110752496.8 discloses a submerged rotating packed bed reactor, in which the rotor packing is submerged in the reactants. The sufficient shearing action provided by the reactor improves mass transfer and reaction rates, making the equipment suitable for heterogeneous systems such as gas-liquid and liquid-liquid. This invention utilizes this equipment to develop a system and method for antibiotic wastewater degradation, aiming to meet the requirements for continuous degradation of antibiotic wastewater. Summary of the Invention

[0004] The first technical problem this application aims to solve is to provide a system device for the degradation of antibiotic wastewater. This system device utilizes a two-stage submerged rotating packed bed, achieving large-scale, continuous treatment of antibiotic wastewater while ensuring degradation efficiency. In the submerged rotating packed bed used for antibiotic wastewater degradation, the rotor is submerged in a continuous liquid phase, creating a submerged environment. The gas phase enters the reactor from the center of the packing through a gas distribution pipe, where it undergoes intense shearing and breaking within the packing, effectively reducing bubble diameter and increasing bubble velocity. After leaving the packing, the gas and liquid circulate together within the reactor, passing through a guide tube above the rotor and being drawn back into the rotor center, repeating the shearing and breaking process. This enhances the renewal of the gas-liquid surface, providing a feasible new option for the efficient and deep removal of chloramphenicol from wastewater.

[0005] The second technical problem to be solved by this application is to provide a method for degrading antibiotic wastewater using the above-mentioned system device.

[0006] To solve the first technical problem mentioned above, the present invention adopts the following technical solution: A system for degrading antibiotic wastewater includes an air compressor, an ozone generator, valves, a flow meter, a primary submerged rotating packed bed, a secondary submerged rotating packed bed, an exhaust gas processor, a sedimentation tank, a raw material pump, and an antibiotic wastewater storage tank. The air compressor outlet is connected to the ozone generator; The outlet of the ozone generator is connected in sequence to a valve and a flow meter; The outlet pipe of the flow meter is divided into two branches. The first branch is connected to the gas inlet of the primary submerged rotating packed bed, and the second branch is connected to the gas inlet of the secondary submerged rotating packed bed. The outlet of the antibiotic wastewater storage tank is connected to the raw material pump; The outlet of the raw material pump is connected to the liquid inlet of the primary submerged rotary packed bed; The liquid outlet of the primary submerged rotary packed bed is connected to the liquid inlet of the secondary submerged rotary packed bed; The liquid outlet of the secondary submerged rotating packed bed is connected to the sedimentation tank; Both the primary and secondary submerged rotary packed beds are connected to the exhaust gas processor.

[0007] Preferably, the primary submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles, and other structures. The rotor is submerged in a continuous liquid environment while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material, such as the rotary packed bed disclosed in patent CN202110752496.8.

[0008] Preferably, the secondary submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles, and other structures. The rotor is submerged in a continuous liquid environment, while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material, such as the rotary packed bed disclosed in patent CN202110752496.8.

[0009] To solve the second technical problem mentioned above, the present invention adopts the following technical solution: A method for degrading antibiotic wastewater using the above-mentioned system includes the following steps: S1, Preliminary degradation of antibiotic wastewater S1-1. Antibiotic wastewater in the antibiotic wastewater storage tank is pumped to the primary submerged rotary packed bed by a raw material pump. S1-2. Air is delivered to the ozone generator via an air compressor as a raw material for ozone production; S1-3. The ozone produced by the ozone generator passes through valves and enters the primary submerged rotary packed bed and the secondary submerged rotary packed bed under the control of the flow meter. S1-4. Ozone enters the rotor through the gas distributor and is carried by the circulating liquid flow of antibiotic wastewater in the reactor through the packing. S1-5. Ozone is dispersed into smaller bubbles within the packing material. S1-6. After leaving the packing area, the bubbles pass through the rotor sidewall and are distributed in the main body of the reactor. They move with the circulating liquid flow of antibiotic wastewater in the reactor and undergo preliminary degradation reaction at the same time. S1-7. The gases produced by the initial degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S1-8. The antibiotic wastewater after preliminary degradation is transported from the liquid outlet of the primary submerged rotary packed bed to the liquid inlet of the secondary submerged rotary packed bed. S2, Deep degradation and sedimentation of antibiotic wastewater S2-1. The antibiotic wastewater after preliminary degradation undergoes the degradation reaction process of step S1 again in a secondary submerged rotating packed bed, that is, a deep degradation reaction. S2-2. The gas produced after the deep degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S2-3. After the antibiotic wastewater from the deep degradation reaction is discharged from the secondary submerged rotating packed bed, it enters the sedimentation tank, where it is discharged after sedimentation to separate the insoluble solids contained in the wastewater.

[0010] Preferably, the degradation of antibiotic wastewater includes, but is not limited to, gas-liquid heterogeneous reactions in which gas is the discrete phase during the degradation process of antibiotic wastewater.

[0011] Preferably, in steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 100-1200 r / min.

[0012] Preferably, in steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 300-600 r / min.

[0013] Preferably, in steps S1-6, the temperature of the preliminary degradation reaction is 10-35℃, and the time is 10-30 min.

[0014] Preferably, in step S2-1, the temperature of the deep degradation reaction is 20-30℃, and the time is 40-90 min.

[0015] Preferably, in step S2-1, the rotor speed of the secondary submerged rotary filling bed is 100-1200 r / min.

[0016] Preferably, in step S2-1, the rotor speed of the secondary submerged rotary filling bed is 300-600 r / min.

[0017] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0018] Unless otherwise specified, all raw materials used in this invention can be obtained commercially, and the equipment used in this invention can be conventional equipment in the relevant field or refer to existing technology in the relevant field.

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1) The system device of the present invention uses a two-stage submerged rotating packed bed, which enables large-scale and continuous treatment of antibiotic wastewater while ensuring degradation efficiency.

[0021] 2) The system device designed in this invention can select more suitable operating conditions according to the specific characteristics of the wastewater, and control the rotation speed of the two stages separately to further control costs. Attached Figure Description

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the system device for antibiotic wastewater degradation according to the present invention. Detailed Implementation

[0023] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0024] See Figure 1 As shown, as one aspect of the present invention, the present invention provides a system device for the degradation of antibiotic wastewater, comprising an air compressor 1, an ozone generator 2, a valve 3, a flow meter 4, a primary submerged rotary packed bed 5, a secondary submerged rotary packed bed 6, an exhaust gas processor 7, a sedimentation tank 8, a raw material pump 9, and an antibiotic wastewater storage tank 10. The outlet of the air compressor 1 is connected to the ozone generator 2; The outlet of the ozone generator 2 is connected in sequence to valve 3 and flow meter 4; The outlet pipe of the flow meter 4 is divided into two branches. The first branch is connected to the gas inlet of the primary submerged rotating packed bed 5, and the second branch is connected to the gas inlet of the secondary submerged rotating packed bed 6. The outlet of the antibiotic wastewater storage tank 10 is connected to the raw material pump 9; The outlet of the raw material pump 9 is connected to the liquid inlet of the primary submerged rotary packed bed 5; The liquid outlet of the primary submerged rotary packed bed 5 is connected to the liquid inlet of the secondary submerged rotary packed bed 6; The liquid outlet of the secondary submerged rotating packed bed 6 is connected to the sedimentation tank 8; Both the primary submerged rotary filling bed 5 and the secondary submerged rotary filling bed 6 are connected to the exhaust gas processor 7.

[0025] According to certain embodiments of the present invention, the primary submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles and other structures. The rotor is submerged in a continuous liquid environment while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material, such as the rotary packed bed disclosed in patent CN202110752496.8.

[0026] According to certain embodiments of the present invention, the two-stage submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles and other structures. The rotor is submerged in a continuous liquid environment while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material, such as the rotary packed bed disclosed in patent CN202110752496.8.

[0027] As another aspect of the present invention, a method for degrading antibiotic wastewater using the above-described system device includes the following steps: S1, Preliminary degradation of antibiotic wastewater S1-1. Antibiotic wastewater in the antibiotic wastewater storage tank is pumped to the primary submerged rotary packed bed by a raw material pump. S1-2. Air is delivered to the ozone generator via an air compressor as a raw material for ozone production; S1-3. The ozone produced by the ozone generator passes through valves and enters the primary submerged rotary packed bed and the secondary submerged rotary packed bed under the control of the flow meter. S1-4. Ozone enters the rotor through the gas distributor and is carried by the circulating liquid flow of antibiotic wastewater in the reactor through the packing. S1-5. Ozone is dispersed into smaller bubbles within the packing material. S1-6. After leaving the packing area, the bubbles pass through the rotor sidewall and are distributed in the main body of the reactor. They move with the circulating liquid flow of antibiotic wastewater in the reactor and undergo preliminary degradation reaction at the same time. S1-7. The gases produced by the initial degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S1-8. The antibiotic wastewater after preliminary degradation is transported from the liquid outlet of the primary submerged rotary packed bed to the liquid inlet of the secondary submerged rotary packed bed. S2, Deep degradation and sedimentation of antibiotic wastewater S2-1. The antibiotic wastewater after preliminary degradation undergoes the degradation reaction process of step S1 again in a secondary submerged rotating packed bed, that is, a deep degradation reaction. S2-2. The gas produced after the deep degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S2-3. After the antibiotic wastewater from the deep degradation reaction is discharged from the secondary submerged rotating packed bed, it enters the sedimentation tank, where it is discharged after sedimentation to separate the insoluble solids contained in the wastewater.

[0028] According to certain embodiments of the present invention, the degradation of antibiotic wastewater includes, but is not limited to, heterogeneous gas-liquid reactions in which gas is the continuous phase, such as antibiotic wastewater degradation processes.

[0029] According to certain embodiments of the present invention, in steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 100-1200 r / min.

[0030] According to certain embodiments of the present invention, in steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 300-600 r / min.

[0031] According to certain embodiments of the present invention, in steps S1-6, the temperature of the preliminary degradation reaction is 10-35°C, and the time is 10-30 min.

[0032] According to certain embodiments of the present invention, in step S2-1, the temperature of the deep degradation reaction is 20-30°C, and the time is 40-90 min.

[0033] According to certain embodiments of the present invention, in step S2-1, the rotor speed of the secondary submerged rotary filling bed is 100-1200 r / min.

[0034] According to certain embodiments of the present invention, in step S2-1, the rotor speed of the secondary submerged rotary filling bed is 300-600 r / min. Example 1

[0035] like Figure 1As shown, a method for degrading chloramphenicol wastewater using the above-mentioned system includes the following steps: S1, Preliminary degradation of chloramphenicol wastewater S1-1. Chloramphenicol wastewater in the chloramphenicol wastewater storage tank is pumped to a primary submerged rotary packed bed by a raw material pump; S1-2. Air is delivered to the ozone generator via an air compressor as a raw material for ozone production; S1-3. The ozone produced by the ozone generator passes through valves and enters the primary submerged rotary packed bed and the secondary submerged rotary packed bed under the control of the flow meter. S1-4. Ozone enters the rotor through the gas distributor and is carried by the circulating liquid flow through the packing. S1-5. Ozone is dispersed into smaller bubbles within the packing material. S1-6. After leaving the packing zone, the bubbles pass through the rotor sidewall and are distributed in the main body of the reactor. They move in the reactor with the circulating liquid flow and undergo preliminary degradation reaction at the same time. S1-8. The gases produced by the initial degradation reaction and the ozone that have not been fully reacted escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S1-9. The chloramphenicol wastewater after preliminary degradation is transported from the liquid outlet of the primary submerged rotary packed bed to the liquid inlet of the secondary submerged rotary packed bed. S2, Chloramphenicol wastewater deep degradation and sedimentation S2-1. The chloramphenicol wastewater after preliminary degradation undergoes the degradation reaction process of step S1 again in a secondary submerged rotating packed bed, that is, it undergoes a deep degradation reaction. S2-2. The gas produced after the deep degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S2-3. After the chloramphenicol wastewater from the deep degradation reaction is discharged from the secondary submerged rotating packed bed, it enters the sedimentation tank, where the insoluble solids contained in the wastewater are separated by sedimentation before being discharged.

[0036] The experimental conditions were as follows: the submerged rotating packed bed speed was 400 r / min, the initial concentration of chloramphenicol was 20 mg / L, the ozone concentration was 30 mg / L, and the degradation temperature was 30℃. The concentration of chloramphenicol in the wastewater was detected by ultraviolet spectrophotometry. After 16 minutes, the primary degradation rate of chloramphenicol reached 73%, and after 50 minutes, the deep degradation rate reached 87%, with a degradation rate constant of 0.08 min. -1 . Example 2

[0037] like Figure 1As shown, a method for degrading sulfamethoxazole wastewater using the above-mentioned system includes the following steps: Repeating Example 1, except that the raw material solution is sulfamethoxazole wastewater; the experimental conditions are as follows: the submerged rotating packed bed speed is 300 r / min, the initial concentration of sulfamethoxazole is 20 mg / L, the ozone concentration is 100 mg / L, and the degradation temperature is 25℃. The concentration of sulfamethoxazole in the wastewater is detected by ultraviolet spectrophotometry. The degradation rate of sulfamethoxazole reaches 80% after 12 minutes, and the deep degradation rate reaches 92% after 40 minutes. Example 3

[0038] Example 2 was repeated, except that the rotational speed of the submerged rotary packed bed was increased to 400 r / min, while other experimental conditions remained unchanged. After 12 minutes, the degradation rate of sulfamethoxazole reached 91%, and after 40 minutes, the deep degradation rate reached 95%.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A system device for the degradation of antibiotic wastewater, characterized in that: It includes an air compressor, an ozone generator, valves, a flow meter, a primary submerged rotary packed bed, a secondary submerged rotary packed bed, an exhaust gas processor, a sedimentation tank, a raw material pump, and an antibiotic wastewater storage tank; The air compressor outlet is connected to the ozone generator; The outlet of the ozone generator is connected in sequence to a valve and a flow meter; The outlet pipe of the flow meter is divided into two branches. The first branch is connected to the gas inlet of the primary submerged rotating packed bed, and the second branch is connected to the gas inlet of the secondary submerged rotating packed bed. The outlet of the antibiotic wastewater storage tank is connected to the raw material pump; The outlet of the raw material pump is connected to the liquid inlet of the primary submerged rotary packed bed; The liquid outlet of the primary submerged rotary packed bed is connected to the liquid inlet of the secondary submerged rotary packed bed; The liquid outlet of the secondary submerged rotating packed bed is connected to the sedimentation tank; Both the primary and secondary submerged rotary packed beds are connected to the exhaust gas processor.

2. The system apparatus for antibiotic wastewater degradation according to claim 1, characterized in that: The primary submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles, and other structures. The rotor is submerged in a continuous liquid environment, while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material.

3. The system apparatus for antibiotic wastewater degradation according to claim 1, characterized in that: The two-stage submerged rotary packed bed mainly includes a rotor, a feed pipe, a guide tube, baffles, and other structures. The rotor is submerged in a continuous liquid environment, while the gas phase enters the reactor through a gas distributor and is sheared and broken into discrete bubbles by the packing material.

4. A method for degrading antibiotic wastewater using any one of the system devices described in claims 1-3, characterized in that, Includes the following steps: S1, Preliminary degradation of antibiotic wastewater S1-1. Antibiotic wastewater in the antibiotic wastewater storage tank is pumped to the primary submerged rotary packed bed by a raw material pump. S1-2. Air is delivered to the ozone generator via an air compressor as a raw material for ozone production; S1-3. The ozone produced by the ozone generator passes through valves and enters the primary submerged rotary packed bed and the secondary submerged rotary packed bed under the control of the flow meter. S1-4. Ozone enters the rotor through the gas distributor and is carried by the circulating liquid flow of antibiotic wastewater inside the reactor through the packing. S1-5. Ozone is dispersed into smaller bubbles within the packing material. S1-6. After leaving the packing area, the bubbles pass through the rotor sidewall and are distributed in the main body of the reactor. They move with the circulating liquid flow of antibiotic wastewater inside the reactor and undergo preliminary degradation reaction at the same time. S1-7. The gases produced by the initial degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S1-8. The antibiotic wastewater after preliminary degradation is transported from the liquid outlet of the primary submerged rotary packed bed to the liquid inlet of the secondary submerged rotary packed bed. S2, Deep degradation and sedimentation of antibiotic wastewater S2-1. The antibiotic wastewater after preliminary degradation undergoes the degradation reaction process of step S1 again in a secondary submerged rotating packed bed, that is, a deep degradation reaction. S2-2. The gas produced after the deep degradation reaction and the unreacted ozone escape through the liquid surface under the action of buoyancy, and finally enter the exhaust gas processor after being discharged through the gas outlet. S2-3. After the antibiotic wastewater from the deep degradation reaction is discharged from the secondary submerged rotating packed bed, it enters the sedimentation tank, where it is discharged after sedimentation to separate the insoluble solids contained in the wastewater.

5. The method for degrading antibiotic wastewater according to claim 4, characterized in that: The degradation of antibiotic wastewater includes, but is not limited to, gas-liquid heterogeneous reactions in which gas is the discrete phase during the degradation process.

6. The method for degrading antibiotic wastewater according to claim 4, characterized in that: In steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 100-1200 r / min.

7. The method for degrading antibiotic wastewater according to claim 6, characterized in that: In steps S1-2, the rotor speed range of the high-speed rotation of the rotor is 300-600 r / min.

8. The method for degrading antibiotic wastewater according to claim 4, characterized in that: In step S2-1, the rotor speed of the secondary submerged rotary filling bed is 100-1200 r / min.

9. The method for degrading antibiotic wastewater according to claim 8, characterized in that: In step S2-1, the rotor speed of the secondary submerged rotary filling bed is 300-600 r / min.

10. The method for degrading antibiotic wastewater according to claim 4, characterized in that: In steps S1-6, the temperature of the preliminary degradation reaction is 10-35 ℃ and the time is 10-30 min; in step S2-1, the temperature of the deep degradation reaction is 20-30 ℃ and the time is 40-90 min.

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