A method for rapidly removing enrofloxacin in an aeration tank of a breeding tail water treatment technology "three pools and two dams" by micro-nano aeration and adding calcium peroxide

Abstract

The application discloses a method for rapidly removing enrofloxacin in a breeding tail water treatment technology "three pools and two dams" by micro-nano aeration in an aeration tank in cooperation with calcium peroxide, and specifically comprises the following steps: installing a micro-nano bubble generating device, placing the water inlet end of a water inlet pipe and the water outlet end of a water outlet pipe of the micro-nano bubble generating device below the liquid level in the aeration tank, and starting the micro-nano bubble generating device; spraying calcium peroxide; after the aeration tank stably generates micro-nano bubbles, spraying calcium peroxide in the aeration tank to degrade enrofloxacin in the breeding tail water in the aeration tank at a concentration of μg / L level. The breeding tail water is circulated through the micro-nano bubble generating device, a large number of micro-nano bubbles are generated, and the oxygen-producing agent calcium peroxide which is frequently used in breeding management activities is added. The calcium peroxide is non-toxic, can release oxygen when meeting water, can rapidly generate high-activity oxygen in the water body, can increase the dissolved oxygen content of the water body, can generate a large number of free radicals, can improve the oxygen mass transfer efficiency, and can rapidly and effectively remove enrofloxacin in the breeding tail water.

Description

Technical Field

[0001] This invention relates to the field of aquatic environmental protection technology, and to a method for the rapid removal of enrofloxacin from aquaculture wastewater. Specifically, it relates to a method for the rapid removal of enrofloxacin by aeration in the aeration tank of a "three ponds and two dams" aquaculture wastewater treatment technology, using micro-nano aeration and synergistic addition of calcium peroxide. Background Technology

[0002] Enrofloxacin, a broad-spectrum and highly effective antibacterial drug, is widely used in aquaculture. Enrofloxacin is typically added to aquaculture ponds by mixing it with feed. However, it is not completely absorbed by organisms, and residual enrofloxacin enters the aquaculture water in the form of the drug itself or its metabolites through excrement. This makes enrofloxacin a frequently detected antibiotic in aquaculture water, with detection concentrations reaching up to 100 μg / L. Large volumes of aquaculture water with low concentrations of enrofloxacin form aquaculture wastewater. If this wastewater is directly discharged into surrounding waters or recycled back into aquaculture ponds, the enrofloxacin and its metabolites may induce resistance genes in the water, potentially causing toxic effects on aquatic organisms and humans.

[0003] Therefore, when treating aquaculture wastewater, it is essential to effectively treat enrofloxacin in the wastewater. Among existing antibiotic treatment technologies, Chinese utility model patent CN221319475 U discloses an antibiotic adsorption packing material and adsorption tank for aquaculture wastewater. This method utilizes various adsorption packing materials and adsorption tanks to increase the residence time of the wastewater and physically adsorb antibiotics into the packing material. However, it does not achieve the degradation and elimination of antibiotics, and the adsorbed packing material still needs to be recycled, resulting in high labor and economic costs.

[0004] Chinese patent application CN 112142158A discloses a method for removing antibiotic residues from aquaculture wastewater. It utilizes the unique photolysis properties of antibiotics in seawater to reduce residual antibiotics in aquaculture wastewater by changing the light intensity and duration. However, this method requires an external ultraviolet light source disinfection device, resulting in high operating costs and energy consumption.

[0005] Chinese patent CN 118026479 B discloses a method for removing traditional pollutants in effluent in conjunction with emerging antibiotic pollutants. This method requires improvements to the effluent treatment technology and modifications to the overall module construction to achieve a removal rate of over 80% for pollutants in effluent in conjunction with antibiotic pollution, but the cost is relatively high.

[0006] Chinese patent CN 115784415 B discloses a micro-nano ozone bubble coupled sulfur-mediated bioelectrochemical treatment system and its method for treating antibiotic production wastewater. This technology effectively increases the dissolved oxygen content in water using micro-nano ozone, ensuring the variety and concentration of active substances produced. However, relying solely on micro-nano technology cannot achieve the desired results; it needs to be used in conjunction with an electrochemical treatment system to achieve green and efficient treatment of antibiotic production wastewater. The electrochemical system in the prior art is unsuitable for aquaculture environments and would directly endanger the safety of aquatic organisms. Furthermore, this technology primarily targets the degradation of high-concentration antibiotics in production wastewater, ranging from hundreds to tens of mg / L. While it can meet the treatment requirements of production wastewater, the remaining mg / L of antibiotics still far exceeds the residual concentration in aquaculture environments, posing a toxic effect on aquatic organisms.

[0007] Therefore, the key to solving the problem of enrofloxacin residue in aquaculture wastewater lies in how to safely and effectively improve the removal efficiency of low-concentration μg / L enrofloxacin in the existing "three ponds and two dams" aquaculture wastewater treatment technology. Summary of the Invention

[0008] Technical Problem Solved: Addressing the low removal efficiency of low-concentration (μg / L level) enrofloxacin in existing technologies, this invention proposes a method for rapidly removing enrofloxacin from aquaculture wastewater using a micro-nano aeration method combined with the addition of calcium peroxide in the aeration tank of a "three-pond, two-dam" system. The aquaculture wastewater is circulated through a micro-nano bubble device, generating a large number of micro-nano-sized bubbles. Simultaneously, calcium peroxide, a commonly used oxygen-generating agent in aquaculture management, is added. It is non-toxic, releases oxygen upon contact with water, rapidly generates highly reactive oxygen in the water, increases dissolved oxygen content, produces a large number of free radicals, and improves oxygen mass transfer efficiency, thus quickly and effectively removing enrofloxacin from aquaculture wastewater.

[0009] Technical Solution: A method for rapidly removing enrofloxacin by using micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of a "three-pond, two-dam" aquaculture wastewater treatment technology. The specific steps of the method are as follows:

[0010] Step 1: Install the micro-nano bubble generator: Place the inlet end of the inlet pipe and the outlet end of the outlet pipe of the micro-nano bubble generator below the liquid surface in the aeration tank, and turn on the micro-nano bubble generator to generate micro-nano bubbles.

[0011] Step 2, Sprinkle calcium peroxide: After the aeration tank has stabilized and generated micro-nano bubbles, sprinkle calcium peroxide into the aeration tank at a concentration of 80-120 mg / L to degrade enrofloxacin at a concentration of μg / L in the aquaculture effluent in the aeration tank.

[0012] Preferably, the concentration range of enrofloxacin in step two is 10–100 μg / L.

[0013] Preferably, the concentration of calcium peroxide in step two is 100 mg / L.

[0014] Preferably, in step one, the bubble size generated by the micro-nano bubble generating device is 40nm to 20μm, the circulating water volume is 30L / min, the gas flow rate at the device inlet is 2.4L / min, the gas is air, and the gas injection volume is 7-10% of the water volume.

[0015] Preferably, in step two, after calcium peroxide is sprinkled into the aeration tank, the micro-nano bubble generating device is continuously operated for 200 minutes.

[0016] Preferably, the water inlet end of the water inlet pipe of the micro-nano bubble generating device in step one is equipped with a filter head to prevent large particulate suspended matter from being sucked into the device and causing blockage.

[0017] Preferably, in step two, the area where calcium peroxide is sprinkled is close to the water inlet end of the water inlet pipe of the micro-nano bubble generating device. Calcium peroxide is a commonly used oxygenating agent in aquaculture, which can slowly release oxygen. Water with higher oxygen content entering the micro-nano bubble generating device can promote the generation of free radicals.

[0018] Beneficial effects:

[0019] (1) The present invention uses micro-nano aeration to generate a large number of nano-sized bubbles in water. Compared with traditional aeration, the oxygen mass transfer efficiency is higher, and a large number of free radicals are generated at the same time. The residence time is longer, and the oxidation effect on enrofloxacin is stronger.

[0020] (2) This invention uses micro-nano aeration and synergistic addition of 100 mg / L of oxygen-generating agent calcium peroxide to achieve rapid and efficient removal of enrofloxacin at the μg / L level in aquaculture effluent. Compared with single micro-nano aeration or only adding calcium peroxide, it greatly improves the removal efficiency of low-concentration enrofloxacin. With only single micro-nano aeration, the concentration of enrofloxacin hardly changes within a short time (200 min); although adding calcium peroxide can reduce the concentration of enrofloxacin by 50% within 24 hours, it takes a long time to achieve effective degradation; when calcium peroxide is replaced with the same type of oxygenating agent, such as 3% liquid hydrogen peroxide, the experiment found that the concentration of enrofloxacin did not change within 200 min. Therefore, not all oxygenating agents can produce the same effect as the technical solution of this invention.

[0021] (3) The micro-nano bubble generating device used in the method provided by the present invention has a low cost. The oxygen generating agent calcium peroxide is a commonly used oxygen generating agent in aquaculture. It does not increase production costs or generate secondary pollution, thus ensuring the quality and safety of aquaculture water and aquatic products. It can also efficiently remove low concentrations of enrofloxacin in aquaculture tail water within 200 minutes, with a degradation rate of up to 86.4%, which greatly shortens the degradation time. Attached Figure Description

[0022] Figure 1 This diagram illustrates the structure of a device in the "three ponds and two dams" aeration tank of an aquaculture wastewater treatment system that uses micro-nano aeration combined with the addition of calcium peroxide for rapid removal of enrofloxacin. The numbers in the diagram represent the following: 1. Aeration tank; 2. Calcium peroxide application area; 3. Filter head; 4. Inlet pipe; 5. Inlet; 6. Air inlet; 7. Gas flow meter; 8. Self-priming gas-liquid mixing pump; 9. Outlet; 10. Outlet pipe; S1. Sedimentation tank; S2. Filter dam; S3. Ecological purification tank;

[0023] Figure 2 Comparative graphs showing the effects of micro-nano aeration combined with different concentrations of calcium peroxide on the degradation of enrofloxacin;

[0024] Figure 3 A comparison chart of dissolved oxygen content between micro-nano aeration, conventional aeration, and micro-nano aeration + 100 mg / L calcium peroxide.

[0025] Figure 4 Bubble size diagrams at different times after 60 minutes of use of the micro / nano bubble generation device;

[0026] Figure 5 A comparison chart of oxygen transfer efficiency between micro / nano aeration and traditional aeration methods. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the present invention.

[0028] The applicant found in their research that the current aquaculture wastewater treatment technology, the "three ponds and two dams" system, primarily utilizes the aeration tank module for the physical degradation of antibiotics, accelerating the decomposition of organic matter by increasing dissolved oxygen in the water. However, conventional aeration methods result in relatively slow degradation of enrofloxacin, with a degradation half-life of approximately 30 days. To improve the degradation efficiency of low-concentration enrofloxacin, the following technical solution is proposed:

[0029] Among them, "three ponds and two dams" refers to the tailwater treatment system consisting of three ponds and two filtration dams. See [link / reference] Figure 1The three ponds, from upstream to downstream, are sedimentation pond S1, aeration pond 1, and ecological purification pond S3, and are separated by a filter dam S2.

[0030] The equipment and pharmaceuticals used in the embodiments of this specification are as follows:

[0031] The micro / nano bubble generator was purchased from Shandong Jinan Sencheng Environmental Protection Technology Co., Ltd., model SCHB-Ⅱ. (See also...) Figure 1 The micro-nano bubble generating device includes an inlet pipe 4, a main body, and an outlet pipe 10. The main body is equipped with an inlet 5, an air inlet 6, a gas flow regulator 7, a self-priming gas-liquid mixing pump 8, and an outlet 9. Both the inlet pipe 4 and the outlet pipe 10 are connected below the liquid surface of the aeration tank 1. Specifically, the inlet end of the inlet pipe 4 is connected below the liquid surface in the aeration tank 1 of the "three ponds and two dams" aquaculture wastewater treatment technology, and the outlet end is connected to the inlet 5 located on one side of the main body. The air inlet 6 is located at the bottom on the same side as the inlet 5. The gas flow regulator 7... The self-priming gas-liquid mixing pump 8 is located inside the main body. The air inlet 6 is connected to the air inlet pipe of the self-priming gas-liquid mixing pump 8 through the gas flow regulator 7. The water inlet 5 is connected to the water inlet pipe of the self-priming gas-liquid mixing pump 8. The mixing outlet of the self-priming gas-liquid mixing pump 8 is connected to the outlet pipe 9. The water inlet of the water outlet pipe 10 is connected to the outlet 9. The water outlet is connected to the aeration tank 1 of the "three ponds and two dams" aquaculture tailwater treatment technology below the liquid level. The water inlet pipe 4 and the water outlet pipe 10 are respectively located on both sides of the aeration tank 1.

[0032] In one preferred embodiment of the present invention, the micro-nano bubble generating device further includes a filter head 3, which is disposed at the water inlet end of the water inlet pipe 4 to prevent large particulate suspended matter from being sucked into the device and causing blockage.

[0033] In one preferred embodiment of the present invention, the calcium peroxide spraying area 2 is located near the water inlet end of the water inlet pipe 4. Calcium peroxide is a commonly used oxygenating agent in aquaculture, which can slowly release oxygen. Water with higher oxygen content enters the micro-nano bubble generating device, which can promote the generation of free radicals.

[0034] Unless otherwise specified, the micro-nano bubble generating devices used in the following specific embodiments all include a filter head 3, and the calcium peroxide spraying area 2 is located near the water inlet end of the water inlet pipe 4.

[0035] Calcium peroxide was purchased from Sinopharm Group.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment uses the "three ponds and two dams" aeration tank 1 based on aquaculture wastewater treatment technology. The specific steps of the method are as follows:

[0038] Step 1: Install the micro-nano bubble generator. Place the inlet end of the inlet pipe 4 and the outlet end of the outlet pipe 10 of the micro-nano bubble generator below the liquid surface in the aeration tank. Turn on the micro-nano bubble generator so that the aquaculture tailwater in the aeration tank 1 is sucked in by the self-priming gas-liquid mixing pump 8 and discharged into the aeration tank 1 through the outlet pipe 10. The effluent is rich in a large number of micro-nano bubbles and the solution is milky white. Before turning it on, turn off the gas flow regulator 7. Adjust the air intake after the effluent is normal.

[0039] Step 2: Apply calcium peroxide. After micro-nano bubbles are stably generated in aeration tank 1, apply calcium peroxide to the calcium peroxide application zone 2 in aeration tank 1 to degrade enrofloxacin at a concentration of μg / L in the aquaculture effluent of aeration tank 1. Under the action of micro-nano bubbles and the oxygen-generating agent calcium peroxide, the aquaculture effluent generates a large amount of active oxygen, increases the dissolved oxygen content in the water, improves oxygen mass transfer efficiency, generates a large number of free radicals, and the long residence time of the bubbles promotes the oxidative degradation of enrofloxacin.

[0040] Example 2

[0041] Similar to Example 1, except that the initial concentration of enrofloxacin in the aquaculture effluent in aeration tank 1 in this example is 100 μg / L.

[0042] The concentrations of calcium peroxide were set at 40 mg / L, 60 mg / L, 80 mg / L, 100 mg / L and 120 mg / L, respectively.

[0043] The micro-nano bubble generating device produces bubbles with a size of 40nm to 20μm, a circulating water volume of 30L / min, a gas flow rate of 2.4L / min at the device's air inlet, and uses air as the gas, with the gas injection volume being 8% of the water volume.

[0044] After calcium peroxide was sprinkled into the aeration tank, the micro-nano bubble generating device was continuously operated for 200 minutes. Samples were taken at the beginning of the experiment and every 20 minutes. The degree of enrofloxacin degradation was evaluated by measuring the change in the concentration of enrofloxacin in the aquaculture effluent.

[0045] The graph shows the comparison of enrofloxacin degradation under different concentrations of calcium peroxide in micro-nano aeration, with the sampling time on the x-axis and the concentration of enrofloxacin in the corresponding time period on the y-axis. Figure 2In the experimental groups with calcium peroxide concentrations of 40 mg / L and 60 mg / L, the concentration of enrofloxacin remained unchanged within 200 minutes (therefore not shown in the figure). However, when the calcium peroxide concentration was increased to 80 mg / L, 100 mg / L, and 120 mg / L, more than 70% of enrofloxacin was removed within 200 minutes. Under the condition of micro-nano aeration combined with the addition of 100 mg / L calcium peroxide, the degradation rate of enrofloxacin reached 86.4%, indicating that this method is feasible for the removal of enrofloxacin at the μg / L level in aquaculture effluent.

[0046] Comparative Example 1

[0047] Similar to Example 2, the difference is that this comparative example does not use calcium peroxide, but only uses micro-nano aeration to treat the aquaculture wastewater in aeration tank 1 (the initial concentration of enrofloxacin is 100 μg / L).

[0048] The micro-nano bubble generating device was continuously operated for 200 minutes. Samples were taken at the beginning of the experiment and every 20 minutes to evaluate the degradation degree of enrofloxacin by measuring the concentration change of enrofloxacin in the aquaculture effluent. The experimental results showed that the concentration of enrofloxacin did not change within 200 minutes. This indicates that micro-nano bubbles generated by the micro-nano bubble device alone have no degradation effect on enrofloxacin in a short period of time.

[0049] Comparative Example 2

[0050] Similar to Comparative Example 1, the difference is that this comparative example uses a traditional aeration method. Details are as follows:

[0051] The traditional aeration method uses a microporous aerator, purchased from Luyi Fishing Tackle Store in Wuxi, Jiangsu Province. It has a power of 30W, a maximum exhaust volume of 16L / min, and produces bubble particles with a diameter of 100μm to 500μm.

[0052] Using the methods of Comparative Examples 1 and 2, under the same conditions, the aeration tank effluent was simultaneously aerated for 200 minutes. The dissolved oxygen content was observed under both aeration methods, as well as with the synergistic addition of 100 mg / L calcium peroxide to micro-nano aeration. (See also...) Figure 3 At 26℃ (room temperature), the dissolved oxygen (DO) concentration of traditional aeration methods slowly reached the oxygenated state of 8.29±0.20 mg / L. However, during the micro-nano aeration process, the DO concentration exceeded the oxygenated state and rapidly rose to 10.24±0.07 mg / L. When micro-nano aeration was combined with the addition of calcium peroxide, the DO concentration rapidly increased to 11.87±0.15 mg / L, exceeding the DO content when micro-nano aeration was used alone. This indicates that the synergistic use of micro-nano aeration and calcium peroxide has a positive promoting effect on DO in water, and the effect is significantly higher than expected.

[0053] Simultaneously, the micro-nano bubble generating device was observed to have stopped aeration. The micro-nano bubble sizes after different times (0 min, 10 min, 30 min, and 60 min) ranged from 278 to 1630 nm (e.g., ...). Figure 4 (As shown). The size of micro- and nanobubbles ranges from 292 to 468 nm. The smaller the bubble, the larger its specific surface area and the greater the internal pressure. Upon rupture, it releases a large amount of chemical energy and generates numerous free radicals, thus resulting in higher oxygen mass transfer efficiency. The oxygen transfer rate was calculated using linear regression fitting (…). Figure 5 ), oxygen transfer coefficient (K) of micro-nano aeration La The oxygen transfer coefficient was 0.7934 / min, which is 10 times higher than that of traditional aeration (0.0717 / min). Even after the micro-nano bubble generator stopped aeration for 60 minutes, the bubble size range remained between 295 and 852 nm, indicating that the slow contraction of the micro-nano bubbles delayed their residence time in the water. This invention, by comparing the performance of micro-nano aeration with traditional aeration methods, found that the micro-nano aeration method resulted in higher dissolved oxygen content, higher oxygen transfer efficiency, the generation of a large number of free radicals, and a longer bubble residence time, making it more suitable for the oxidative degradation of enrofloxacin in aeration tanks of aquaculture wastewater treatment technology.

[0054] Comparative Example 3

[0055] Similar to Example 2, except that this comparative example does not use a micro-nano aeration device, but only adds the oxygen-generating agent calcium peroxide.

[0056] Specifically as follows:

[0057] The initial concentration of enrofloxacin in the aquaculture effluent of aeration tank 1 was 100 μg / L.

[0058] The concentrations of calcium peroxide added were 10 mg / L, 20 mg / L and 40 mg / L, respectively.

[0059] After calcium peroxide was added to the aeration tank, samples were taken at the beginning of the experiment and every 12 hours. The degradation rate of enrofloxacin was evaluated by measuring the change in the concentration of enrofloxacin in the aquaculture effluent. The results showed that the experimental group with a calcium peroxide concentration of 40 mg / L experienced the fastest degradation, with the concentration of enrofloxacin decreasing by 50% within 24 hours. This indicates that low concentrations of the oxygen-generating agent calcium peroxide have a certain degradation effect on enrofloxacin in aquaculture effluent, but effective degradation may require a relatively long time.

[0060] Combined with Comparative Examples 2 and 3, it was found that the oxygen transfer efficiency of micro-nano aeration is better than that of traditional aeration, and that calcium peroxide, a commonly used oxygen-generating agent in aquaculture, has a certain effect on the degradation of enrofloxacin. This suggests that we can combine the two to degrade enrofloxacin.

[0061] Comparative Example 4

[0062] Similar to Example 2, the difference is that in this comparative example, the oxygen-generating agent calcium peroxide is replaced with 3 wt% liquid hydrogen peroxide. Hydrogen peroxide has a strong oxidizing effect and is commonly used as a water quality improver. It decomposes spontaneously in water, releasing oxygen and thus increasing the dissolved oxygen content of the water. Specifically:

[0063] The concentrations of liquid hydrogen peroxide added were 0.5 mL / L and 1 mL / L.

[0064] After liquid hydrogen peroxide was added to the aeration tank, the micro-nano bubble generator was continuously operated for 200 minutes, with samples taken at the beginning of the experiment and every 20 minutes. The degradation degree of enrofloxacin was evaluated by measuring the change in the concentration of enrofloxacin in the aquaculture wastewater. The results showed that the concentration of enrofloxacin did not change within 200 minutes, indicating that the micro-nano aeration method combined with the addition of low-concentration liquid hydrogen peroxide had no degradation effect on enrofloxacin in a short period of time. Furthermore, hydrogen peroxide is corrosive, and the higher the concentration, the stronger the corrosiveness. It is not suitable to add it to the aquaculture wastewater and circulate it through the micro-nano bubble generator, as this may damage the equipment. Therefore, liquid hydrogen peroxide, as an oxygen-generating agent, is not suitable in this technology.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of a "three-pond, two-dam" aquaculture wastewater treatment technology, characterized in that... The aeration tank based on the "three ponds and two dams" technology for treating aquaculture wastewater, the specific steps of which are as follows: Step 1: Install the micro-nano bubble generator: Place the inlet end of the inlet pipe and the outlet end of the outlet pipe of the micro-nano bubble generator below the liquid surface in the aeration tank, and turn on the micro-nano bubble generator to generate micro-nano bubbles. Step 2, Sprinkle calcium peroxide: After the aeration tank has stabilized and generated micro-nano bubbles, sprinkle calcium peroxide into the aeration tank at a concentration of 80~120 mg / L to degrade enrofloxacin at a concentration of μg / L in the aquaculture effluent in the aeration tank. The "three ponds and two dams" refers to a tailwater treatment system consisting of three ponds and two filter dams. The three ponds, from upstream to downstream, are a sedimentation pond, an aeration pond, and an ecological purification pond, and are separated by filter dams.

2. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step two, the concentration range of enrofloxacin is 10~100 μg / L.

3. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step two, the concentration of calcium peroxide is 100 mg / L.

4. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step one, the micro-nano bubble generating device produces bubbles with a size of 40 nm to 20 μm, a circulating water volume of 30 L / min, a gas flow rate of 2.4 L / min at the device inlet, and the gas is air, with the gas injection volume being 7-10% of the water volume.

5. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step two, after calcium peroxide is sprinkled into the aeration tank, the micro-nano bubble generating device is continuously operated for 200 minutes.

6. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step one, the water inlet of the micro-nano bubble generating device is equipped with a filter head to prevent large suspended particles from being sucked into the device and causing blockage.

7. The method for rapidly removing enrofloxacin by micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three ponds and two dams" aquaculture wastewater treatment technology according to claim 1, characterized in that... In step two, the calcium peroxide spraying area is located near the water inlet end of the water inlet pipe of the micro-nano bubble generating device.

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