Method for rapidly removing enrofloxacin in aeration tank of'three-tank two-dam 'in cultivation tail water treatment technology by means of micro-nano aeration and synergistic addition of calcium peroxide

Abstract

A method for rapidly removing enrofloxacin in a three-tank two-dam aeration tank of a culture tail water treatment technology by means of micro-nano aeration and calcium peroxide addition comprises the following specific steps: mounting a micro-nano bubble generation device, and putting the water inlet end of a water inlet pipe and the water outlet end of a water outlet pipe of the micro-nano bubble generation device below the liquid level in the aeration tank; starting a micro-nano bubble generating device; after the aeration tank stably generates micro-nano bubbles, calcium peroxide is splashed into the aeration tank, and enrofloxacin with the concentration of the microgram / L level in the culture tail water in the aeration tank is degraded. Cultivation tail water is circulated through the micro-nano bubble device, a large number of micro-nano bubbles are generated, meanwhile, an oxygen generating agent calcium peroxide which is frequently used in cultivation management activities is added, and the oxygen generating agent calcium peroxide is non-toxic, releases oxygen when meeting water, rapidly generates high active oxygen in water, increases the content of dissolved oxygen in the water, generates a large number of free radicals and improves the oxygen mass transfer efficiency, so that the water quality is improved. The enrofloxacin in the breeding tail water can be quickly and effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of fishery water environment protection, and in particular to a method for rapidly removing enrofloxacin from aquaculture tail water. The method particularly relates to a method for rapidly removing enrofloxacin from an aeration tank using a micro-nano aeration method and the coordinated addition of calcium peroxide in a "three-tank, two-dam" aeration tank for aquaculture tail water treatment. Background Art

[0002] Enrofloxacin is a broad-spectrum, highly effective antimicrobial drug widely used in aquaculture. Enrofloxacin is typically sprayed into aquaculture ponds as a feed mix, but it is not fully absorbed by organisms. Residual enrofloxacin enters aquaculture water in the form of its substance or metabolites through excrement, making enrofloxacin an antibiotic with the highest detection frequency and concentration in aquaculture water, with detection concentrations as high as 100 μg / L. Large volumes of aquaculture water containing low concentrations of enrofloxacin form aquaculture tailwater when discharged. If discharged directly into surrounding waters or recycled back into aquaculture ponds, the enrofloxacin substance and its metabolites may induce resistance genes in the water, resulting in potential toxic effects on aquatic organisms and humans.

[0003] Therefore, when treating aquaculture tailwater, enrofloxacin in the tailwater must be effectively treated. Among existing antibiotic treatment technologies, Chinese utility model patent publication number CN221319475 U discloses an aquaculture tailwater antibiotic adsorption filler and adsorption tank. This method utilizes multiple adsorption fillers and adsorption tanks to increase tailwater retention time and physically adsorb the antibiotics into the fillers. However, this method does not achieve degradation and elimination of the antibiotics, and the adsorbed fillers must be recycled, resulting in high labor and economic costs.

[0004] Chinese patent application publication number CN 112142158A discloses a method for removing antibiotic residues in aquaculture tailwater. This method uses the unique photolysis characteristics of antibiotics in seawater to change the light intensity and duration to reduce residual antibiotics in aquaculture tailwater. However, this method requires an external ultraviolet light source disinfection device, which has high operating costs and energy consumption.

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

[0006] The Chinese patent with the announcement number CN 115784415 B discloses a micro-nano ozone bubble coupled sulfur-mediated bioelectrochemical treatment system and a method for treating antibiotic production wastewater. This technology uses micro-nano ozone to effectively increase the dissolved oxygen content in the water, ensuring the type and concentration of the active substances produced. However, the use of micro-nano technology alone cannot meet the expected requirements. It is necessary to use an electrochemical treatment system in conjunction with it to achieve green and efficient treatment of antibiotic production wastewater. The electrochemical system in the comparative document is not suitable for aquaculture environments and will directly endanger the safety of aquatic organisms. In addition, this technology is mainly aimed at the degradation of high-concentration antibiotics in production wastewater from hundreds of mg / L to tens of mg / L. It can meet the treatment needs of production wastewater, but the remaining mg / L of antibiotics is still far higher than the residual concentration in the aquaculture environment, and has toxic effects on aquatic organisms in the aquaculture environment.

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

[0008] Technical problem to be solved: In response to the technical problem of low removal efficiency of low-concentration (μg / L level) enrofloxacin in the existing technology, the present invention proposes a method for quickly removing enrofloxacin by using micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three-tank two-dam" aquaculture tailwater treatment technology. The aquaculture tailwater is circulated through a micro-nano bubble device to generate a large number of micro-nano bubbles. At the same time, calcium peroxide, an oxygen generator frequently used in aquaculture management activities, is added. Calcium peroxide is non-toxic in itself, releases oxygen when it comes into contact with water, and rapidly generates highly active oxygen in the water body, increasing the dissolved oxygen content of the water body, generating a large number of free radicals, and improving the oxygen mass transfer efficiency, thereby quickly and effectively removing enrofloxacin from the aquaculture tailwater.

[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 the "three-tank, two-dam" aquaculture tailwater treatment technology. The method is based on the aeration tank of the "three-tank, two-dam" aquaculture tailwater treatment technology. The specific steps of the method are as follows:

[0010] Step 1: Install the micro-nano bubble generating device: Place the water inlet end and the water outlet end of the water inlet pipe of the micro-nano bubble generating device below the liquid level in the aeration tank, and turn on the micro-nano bubble generating device to generate micro-nano bubbles;

[0011] Step 2: Sprinkling calcium peroxide: After the aeration tank stably produces micro-nano bubbles, sprinkle calcium peroxide in the aeration tank. The concentration of calcium peroxide is 80-120 mg / L to degrade the μg / L level concentration of enrofloxacin in the aquaculture tail water in the aeration tank.

[0012] Preferably, the concentration of enrofloxacin in step 2 is in the range of 10 to 100 μg / L.

[0013] Preferably, the concentration of calcium peroxide in step 2 is 100 mg / L.

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

[0015] Preferably, after the calcium peroxide is sprinkled in the aeration tank in step 2, the micro-nano bubble generating device is kept open for 200 minutes.

[0016] Preferably, a filter head is provided at the water inlet end of the water inlet pipe of the micro-nano bubble generating device in step 1 to prevent large particles of suspended matter from being sucked into the device and causing blockage.

[0017] Preferably, the calcium peroxide sprinkling area in step 2 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 oxygenator in aquaculture and can slowly release oxygen. Water with a higher oxygen content enters the micro-nano bubble generating device, which can promote the generation of free radicals.

[0018] Beneficial effects:

[0019] (1) The present invention adopts 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, with a longer residence time, and a stronger oxidation effect on enrofloxacin;

[0020] (2) The present invention uses micro-nano aeration and synergistically adds 100 mg / L of oxygen-generating agent calcium peroxide to achieve rapid and efficient removal of μg / L level enrofloxacin in aquaculture tail water. Compared with single micro-nano aeration or only adding calcium peroxide, the removal efficiency of low-concentration enrofloxacin is greatly improved. With only a single micro-nano aeration method, the concentration of enrofloxacin hardly changes within a short time (200 minutes); with only adding calcium peroxide, although the concentration of enrofloxacin can be reduced by 50% within 24 hours, it takes a long time to achieve effective degradation; when calcium peroxide is replaced by 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 minutes, so not all oxygenating agents can produce the same effect as the technical solution of the present 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 the production cost and does not cause secondary pollution, thereby ensuring the quality and safety of aquaculture water and aquatic products. It can also efficiently remove low-concentration enrofloxacin in aquaculture tail water within 200 minutes, with a degradation rate of up to 86.4%, greatly shortening the degradation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the device for rapidly removing enrofloxacin by using micro-nano aeration and synergistic addition of calcium peroxide in the aeration tank of the "three-tank, two-dam" aquaculture tailwater treatment technology. The numbers in the figure represent the following: 1. Aeration tank; 2. Calcium peroxide splashing area; 3. Filter head; 4. Water inlet pipe; 5. Water inlet; 6. Air inlet; 7. Gas flow regulator; 8. Self-priming gas-liquid mixing pump; 9. Water outlet; 10. Water outlet pipe; S1. Sedimentation tank; S2. Filter dam; S3. Ecological purification tank;

[0023] Figure 2 This is a comparative diagram of the degradation effect of enrofloxacin under the conditions of micro-nano aeration and the addition of different concentrations of calcium peroxide;

[0024] Figure 3 This is a comparison chart of dissolved oxygen content in micro-nano aeration, traditional aeration, and micro-nano aeration + 100mg / L calcium peroxide.

[0025] Figure 4 The bubble size diagram at different times after the micro-nano bubble generating device was stopped after 60 minutes of use;

[0026] Figure 5 This is a comparison chart of the oxygen transfer efficiency between micro-nano aeration and traditional aeration methods. DETAILED DESCRIPTION

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

[0028] During their research, the applicant discovered that the aeration tank module, a component of the current "three-tank, two-dam" aquaculture tailwater treatment system, primarily physically degrades antibiotics by increasing dissolved oxygen in the water, accelerating the decomposition of organic matter. However, conventional oxygenation methods are relatively slow in degrading enrofloxacin, with a half-life of approximately 30 days. To improve the degradation efficiency of low-concentration enrofloxacin, the applicant proposed the following technical solutions:

[0029] Among them: "Three ponds and two dams" is a tailwater treatment system consisting of three ponds and two filter dams, see Figure 1,These three ponds are sedimentation pond S1, aeration pond 1 and ecological purification pond S3 from upstream to downstream, and the three ponds are separated by the ,filtration dam S2.

[0030] The equipment and drugs used in the examples 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. Figure 1 The micro-nano bubble generating device includes a water inlet pipe 4, a body and a water outlet pipe 10. The body is provided with a water inlet 5, an air inlet 6, a gas flow regulator 7, a self-priming gas-liquid mixing pump 8 and a water outlet 9. The water inlet pipe 4 and the water outlet pipe 10 are both connected to the liquid level of the aeration tank 1, wherein the water inlet end of the water inlet pipe 4 is connected to the liquid level of the aeration tank 1 of the "three pools and two dams" aquaculture tail water treatment technology, and the water outlet end is connected to the water inlet 5 provided on one side of the body. The air inlet 6 is provided at the bottom on the same side of the water inlet 5. The gas flow regulator 7 is provided at the bottom of the water inlet 5. The self-priming gas-liquid mixing pump 8 is arranged 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 mixed water outlet of the self-priming gas-liquid mixing pump 8 is connected to the water outlet 9 pipe, the water inlet end of the outlet pipe 10 is connected to the water outlet 9, and the water outlet end is connected to the aeration tank 1 below the liquid level of the "three pools and two dams" aquaculture tail water treatment technology, and the water inlet pipe 4 and the water outlet pipe 10 are respectively arranged on both sides of the aeration tank 1.

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

[0033] In one of the preferred embodiments of the present invention, the calcium peroxide splashing area 2 is located near the water inlet end of the water inlet pipe 4. Calcium peroxide is a commonly used oxygenator in aquaculture, which can slowly release oxygen. Water with a 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 splashing 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 is based on the aeration tank 1 of the "three pools and two dams" aquaculture tailwater treatment technology, and the specific steps of the method are as follows:

[0038] Step 1: Install the micro-nano bubble generating device, place the water inlet end of the water inlet pipe 4 and the water outlet end of the water outlet pipe 10 of the micro-nano bubble generating device below the liquid level in the aeration tank, turn on the micro-nano bubble generating device, and allow the aquaculture tail water in the aeration tank 1 to be sucked in by the self-priming gas-liquid mixing pump 8, and the water is discharged into the aeration tank 1 through the outlet pipe 10. The outlet water is rich in a large number of micro-nano bubbles, and the solution is milky white. Turn off the gas flow regulator 7 before turning it on, and adjust the air intake after the water outlet is normal;

[0039] Step 2: Spraying calcium peroxide. After aeration tank 1 steadily generates micro-nanobubbles, calcium peroxide is sprayed into the calcium peroxide spraying zone 2 within aeration tank 1 to degrade the μg / L concentration of enrofloxacin in the aquaculture tailwater. The micro-nanobubbles and the oxygen-generating agent calcium peroxide generate a large amount of reactive oxygen species in the tailwater, increasing the dissolved oxygen content, improving oxygen mass transfer efficiency, and generating a large number of free radicals. The prolonged residence of the bubbles promotes the oxidative degradation of enrofloxacin.

[0040] Example 2

[0041] The same as Example 1, except that the initial concentration of enrofloxacin in the aquaculture tail water in the aeration tank 1 in this embodiment is 100 μg / L.

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

[0043] The bubble size generated by the micro-nano bubble generating device is 40nm~20μm, the circulating water volume is 30L / min, the gas flow rate at the device air inlet is 2.4L / min, the gas is air, and the gas injection volume is 8% of the water injection volume.

[0044] After calcium peroxide was sprayed into the aeration tank, the micro-nano bubble generator was kept operating for 200 minutes. Samples were taken at the start of the experiment and every 20 minutes to measure the concentration of enrofloxacin in the aquaculture tailwater to evaluate the degree of enrofloxacin degradation.

[0045] The experimental sampling time is the horizontal axis, and the concentration of enrofloxacin in the corresponding time period is the vertical axis. The comparative effect of enrofloxacin degradation under the conditions of micro-nano aeration and addition of different concentrations of calcium peroxide is shown in the figure ( Figure 2), the enrofloxacin concentration remained unchanged within 200 minutes in the experimental groups with 40 mg / L and 60 mg / L calcium peroxide (not shown in the figure). However, increasing the calcium peroxide concentration to 80 mg / L, 100 mg / L, and 120 mg / L resulted in over 70% removal of enrofloxacin within 200 minutes. The degradation rate of enrofloxacin reached 86.4% when micro-nano aeration was combined with the addition of 100 mg / L calcium peroxide. These results demonstrate the feasibility of this method for removing μg / L-level enrofloxacin in aquaculture tailwater.

[0046] Comparative Example 1

[0047] The method is the same as Example 2, except that calcium peroxide is not sprayed in this comparative example, and only micro-nano aeration is used to treat the aquaculture tail water in aeration tank 1 (the initial concentration of enrofloxacin is 100 μg / L).

[0048] The micro-nano bubble generator was operated for 200 minutes. Samples were collected at the start of the experiment and every 20 minutes to measure changes in the enrofloxacin concentration in the aquaculture tailwater to assess the extent of enrofloxacin degradation. The results showed that the enrofloxacin concentration remained unchanged over the 200-minute period, indicating that the micro-nano bubbles generated solely by the micro-nano bubble generator had no effect on enrofloxacin degradation in the short term.

[0049] Comparative Example 2

[0050] The difference is that this comparative example adopts the traditional aeration method. The details are as follows:

[0051] The traditional aeration method uses a microporous aerator purchased from the Green One 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 particle size of 100μm to 500μm.

[0052] Using the methods of Comparative Example 1 and Comparative Example 2, under the same conditions, the aeration tank tail water was opened for 200 minutes at the same time, and the dissolved oxygen content under the two aeration methods and the micro-nano aeration with the addition of 100 mg / L calcium peroxide was observed. Figure 3 Under 26°C (room temperature), the dissolved oxygen (DO) concentration of the traditional aeration method slowly reached the full oxygen state of 8.29±0.20 mg / L, while during the micro-nano aeration process, the DO concentration broke through the full oxygen state and quickly rose to 10.24±0.07 mg / L; when micro-nano aeration was synergistically added with calcium peroxide, DO quickly rose to 11.87±0.15 mg / L, breaking through the DO content when only micro-nano aeration was used, indicating 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] At the same time, the micro-nano bubble generator stopped aeration and the size of the micro-nano bubbles after different time periods (0 min, 10 min, 30 min and 60 min) was 278-1630 nm (e.g. Figure 4 The size of micro-nano bubbles is between 292-468nm. The smaller the bubble, the larger its specific surface area. The greater the internal pressure accumulated in the bubble, the more chemical energy will be released after the bubble bursts, and a large number of free radicals will be generated, thus making the oxygen mass transfer efficiency of micro-nano bubbles higher. The oxygen transfer rate ( Figure 5 ), oxygen transfer coefficient of micro-nano aeration (K La ) is 0.7934 / min, which is 10 times higher than traditional aeration (oxygen transfer coefficient is 0.0717 / min). When the micro-nano bubble generating device stops aeration for 60 minutes, the bubble size range is still 295-852nm, indicating that the slow contraction of the micro-nano bubbles has delayed the residence time of the bubbles in the water. By comparing the aeration performance of micro-nano and traditional methods, the present invention found that the micro-nano aeration oxygenation method has higher dissolved oxygen content in water, higher oxygen mass transfer efficiency, produces a large number of free radicals, and prolongs the bubble residence time, making it more suitable for the oxidative degradation of enrofloxacin in the aeration tank of aquaculture tailwater treatment technology.

[0054] Comparative Example 3

[0055] The difference is the same as Example 2, except that this comparative example does not use a micro-nano aeration generating device, and only adds an oxygen generating agent, calcium peroxide.

[0056] The details are as follows:

[0057] The initial concentration of enrofloxacin in the aquaculture tail water in aeration pond 1 was 100 μg / L.

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

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

[0060] Combining Comparative Examples 2 and 3, it was found that the oxygen mass transfer efficiency of micro-nano aeration was better than that of traditional aeration, and calcium peroxide, a commonly used oxygen-generating agent in aquaculture, had a certain effect on the degradation of enrofloxacin, suggesting that the two can be combined to degrade enrofloxacin.

[0061] Comparative Example 4

[0062] The same as Example 2, except that this comparative example replaces the oxygen-generating agent calcium peroxide with 3 wt% liquid hydrogen peroxide. Hydrogen peroxide has a strong oxidizing effect and is usually used as a water quality improver. It will decompose in water and release oxygen, thereby increasing the dissolved oxygen content of the water. Specifically:

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

[0064] After liquid hydrogen peroxide was sprayed into the aeration tank, the micro-nano bubble generator was kept open for 200 minutes, and samples were taken at the beginning of the experiment and every 20 minutes. The degree of degradation of enrofloxacin was evaluated by measuring the concentration change of enrofloxacin in the aquaculture tail water. The results showed that the concentration of enrofloxacin did not change within 200 minutes, indicating that the micro-nano aeration method and the synergistic addition of low-concentration liquid hydrogen peroxide had no degradation effect on enrofloxacin in a short period of time. In addition, hydrogen peroxide is corrosive when used, and the higher the concentration, the stronger the corrosiveness. It is not suitable for spraying into the aquaculture tail water and circulating the water through the micro-nano bubble generator, as it may cause damage to the machine. Therefore, liquid hydrogen peroxide as an oxygen generator is not applicable 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, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for rapidly removing enrofloxacin by using micro-nano aeration and adding calcium peroxide in an aeration tank of aquaculture tailwater treatment technology "three pools and two dams", characterized in that: Based on the aeration pond of the "three ponds and two dams" aquaculture tailwater treatment technology, the specific steps of the method are as follows: Step 1: Install the micro-nano bubble generating device: place the water inlet end and the water outlet end of the water inlet pipe of the micro-nano bubble generating device below the liquid level in the aeration tank, and turn on the micro-nano bubble generating device to generate micro-nano bubbles; Step 2: Spraying calcium peroxide: After the aeration tank stably produces micro-nano bubbles, calcium peroxide is sprayed in the aeration tank. The concentration of calcium peroxide is 80-120 mg / L to degrade the μg / L level of enrofloxacin in the aquaculture tail water in the aeration tank.

2. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration pond using a micro-nano aeration method in a "three ponds and two dams" aeration pond for aquaculture tailwater treatment according to claim 1, characterized in that: The concentration range of enrofloxacin in step 2 is 10-100 μg / L.

3. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration pond using a micro-nano aeration method in a "three ponds and two dams" aeration pond for aquaculture tailwater treatment according to claim 1, characterized in that: The concentration of calcium peroxide in step 2 is 100 mg / L.

4. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration pond using a micro-nano aeration method in a "three ponds and two dams" aeration pond for aquaculture tailwater treatment according to claim 1, characterized in that: In the step 1, the bubble size generated by the micro-nano bubble generating device is 40nm-20μm, the circulating water volume is 30L / min, the gas flow rate at the device air inlet is 2.4L / min, the gas is air, and the gas injection volume is 7-10% of the water injection volume.

5. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration tank using a micro-nano aeration method in a "three-tank two-dam" aeration tank for aquaculture tailwater treatment according to claim 1, characterized in that: After calcium peroxide is sprinkled in the aeration tank in step 2, the micro-nano bubble generating device is kept open for 200 minutes.

6. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration pond using a micro-nano aeration method in a "three ponds and two dams" aeration pond for aquaculture tailwater treatment according to claim 1, characterized in that: In the step 1, a filter head is provided at the water inlet end of the water inlet pipe of the micro-nano bubble generating device to prevent large particles of suspended matter from being sucked into the device and causing blockage.

7. The method for rapidly removing enrofloxacin by adding calcium peroxide in an aeration pond using a micro-nano aeration method in a "three ponds and two dams" aeration pond for aquaculture tailwater treatment according to claim 1, characterized in that: The calcium peroxide splashing area in the step 2 is close to the water inlet end of the water inlet pipe of the micro-nano bubble generating device.

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