Treatment method for aquaculture tail water containing antibiotics

Abstract

The present invention belongs to the field of water treatment technology, and in particular, is a method for treating aquaculture tailwater containing antibiotics, comprising the following steps: S1, sampling and detecting the content of various types of antibiotics in aquaculture tailwater to obtain major antibiotics and minor antibiotics; S2, preparing adsorption fillers for each type of major antibiotics; S3, passing aquaculture tailwater into each adsorption filler in turn; S4, then passing aquaculture tailwater into a photocatalytic treatment facility; S5, detecting the content of various types of antibiotics at the outlet of the photocatalytic treatment facility. The present invention prepares corresponding adsorption fillers for antibiotic categories with higher content, which can ensure the adsorption effect of antibiotics with higher content. The present invention combines adsorption treatment with photocatalytic treatment to further improve the removal effect of various antibiotics.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, in particular to a method for treating aquaculture tail water containing antibiotics. Background Art

[0002] Antibiotics can prevent and treat aquatic diseases and increase aquatic production, so they are widely used in the aquaculture industry. However, antibiotics cannot be completely absorbed by organisms after use, but enter the water body in the form of the main body or metabolites (conjugated state, oxidation products, hydrolysis products, etc.) with excrement. Antibiotics can destroy the cell structure and function of aquatic organisms, affect normal reproduction, cause imbalance in the structure of microbial populations in the water, and destroy the ecological balance. Therefore, antibiotics in aquaculture tailwater need to be treated before discharge.

[0003] At present, ecological treatment methods include adsorption treatment and catalytic decomposition. Adsorption treatment is to use adsorbents to absorb antibiotics in the water body. Please refer to the utility model patent CN202322988296.X-aquaculture tail water antibiotic adsorption filler column and adsorption tank; catalytic decomposition is to promote the decomposition of antibiotics under the action of a catalyst. Please refer to the invention patent CN202110655825.7-a floating photocatalytic material, preparation method and treatment device for antibiotic wastewater degradation. The existing treatment methods are relatively simple and it is difficult to improve the removal rate of antibiotics. In addition, since aquaculture tail water usually contains multiple types of antibiotics, such as tetracyclines, fluoroquinolones, sulfonamides, chloramphenicol, etc., when adsorption is used for treatment, the adsorbent can usually only adsorb one or two types of antibiotics, and the adsorption effect of other types of antibiotics is poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for treating aquaculture tail water containing antibiotics, so as to improve the removal effect of the antibiotics.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a method for treating aquaculture tail water containing antibiotics, comprising the following steps:

[0006] S1. Sample and test the content of various types of antibiotics in aquaculture tail water, and take antibiotics with a content greater than or equal to 10ng / L as the main antibiotics, and antibiotics with a content less than 10ng / L as the secondary antibiotics;

[0007] S2. For each category of main antibiotics, select corresponding adsorption materials and prepare them as adsorption fillers;

[0008] S3, passing the aquaculture tail water into each adsorption filler in turn, and using the adsorption material to absorb each type of main antibiotics in turn;

[0009] S4, then passing the aquaculture tail water into a photocatalytic treatment facility to decompose the secondary antibiotics and residual primary antibiotics;

[0010] The photocatalytic treatment facility comprises a treatment tank, the cross section of which is 3 / 4 circular, and the inner wall of which is provided with a reflective layer; an arc-shaped convex lens is provided above the treatment tank, and the focus of the convex lens is located at the center of the treatment tank; the water depth in the treatment tank is less than or equal to 0.4m, and the flow rate is less than or equal to 0.1m / s; and a photocatalyst is provided inside the treatment tank;

[0011] S5. Detect the content of various types of antibiotics at the outlet of the photocatalytic treatment facility. If the content of various types of antibiotics is lower than the first threshold, the aquaculture effluent is discharged into the natural water body or recycled. If the content of a certain type of antibiotics is higher than or equal to the first threshold and lower than the second threshold, the aquaculture effluent is again passed into the corresponding adsorption filler or photocatalytic treatment facility. If the content of a certain type of antibiotics is higher than or equal to the second threshold, the corresponding adsorption filler is replaced.

[0012] Furthermore, the adsorption filler comprises a frame, both sides of the frame are provided with water-permeable positioning layers, and an adsorption layer is provided between the water-permeable positioning layers.

[0013] Further, the frame can be detachably installed in the processing ditch;

[0014] In step S5, when the content of a certain type of antibiotic is higher than or equal to the second threshold, the corresponding adsorption filler is removed and placed in an alkaline cleaning tank, an ethanol cleaning tank and a clean water cleaning tank in sequence, wherein the alkaline cleaning tank, the ethanol cleaning tank and the clean water cleaning tank are all provided with an ultrasonic generator, the alkaline cleaning tank is provided with a photocatalyst, and a light supplement device is provided inside or on the top of the alkaline cleaning tank;

[0015] In the alkaline cleaning tank, the ultrasonic generator emits ultrasonic waves to the adsorption layer, and the antibiotics adsorbed on the adsorption layer are separated from the adsorption layer and decomposed under the conditions of photocatalyst and light;

[0016] In the ethanol cleaning tank, the ultrasonic generator emits ultrasonic waves to the adsorption layer, and the antibiotics adsorbed by the adsorption layer react with the ethanol and are separated from the adsorption layer;

[0017] In the clean water cleaning tank, the adsorption layer is cleaned and can be used again after cleaning.

[0018] Furthermore, the photocatalyst is suspended particles, the water outlet of the treatment tank is provided with an inclined recovery tank, the bottom wall of the recovery tank is provided with multiple water filtering holes, the lower end of the recovery tank is provided with a recovery box, and the recovery box is connected to the water inlet end of the treatment tank through a spiral conveying pipe.

[0019] Furthermore, the photocatalyst comprises a hollow plastic sphere, the outer surface of which is sprayed with a titanium dioxide powder layer, and the overall density of the hollow plastic sphere and the titanium dioxide powder layer is 0.95 to 1.08 g / cm 3 .

[0020] Furthermore, an aeration pipe is provided at the bottom of the treatment tank, the aeration pipe is connected to an aeration fan, and a plurality of aeration holes are provided on the aeration pipe.

[0021] Further, the first threshold is 1 ng / L and the second threshold is 5 ng / L.

[0022] The beneficial effects of the present invention are as follows: 1. The present invention prepares corresponding adsorption fillers for antibiotics with relatively high content, thereby ensuring the adsorption effect of antibiotics with relatively high content.

[0023] 2. The present invention combines adsorption treatment with photocatalytic treatment to further improve the removal effect of various antibiotics.

[0024] 3. The present invention detects the content of various antibiotics in aquaculture tail water, and according to the application amount of antibiotics, the utilization rate of antibiotics by aquaculture can be understood, thereby adjusting the dosage of antibiotics, avoiding antibiotic waste, and reducing the content of antibiotics in aquaculture tail water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the process of the present invention;

[0026] Figure 2 is a schematic cross-sectional view of the adsorption filler of the present invention;

[0027] Figure 3 It is a schematic diagram of the treatment trench;

[0028] Figure 4 is a schematic diagram of an adsorption filler recovery system;

[0029] Figure 5 is a schematic diagram of a photocatalytic treatment facility;

[0030] Figure 6 yes Figure 5 Middle AA section view;

[0031] Figure 7 is a schematic diagram of a photocatalyst;

[0032] Figure 8 is a top view schematic diagram of the connection between the photocatalytic treatment facility and the treatment ditch;

[0033] Figure numerals: 1—frame; 2—permeable positioning layer; 3—adsorption layer; 4—treatment ditch; 5—alkaline cleaning tank; 6—ethanol cleaning tank; 7—clean water cleaning tank; 8—ultrasonic generator; 9—light-supplementing equipment; 10—treatment tank; 11—convex lens; 12—reflective layer; 13—recovery tank; 14—recovery box; 15—spiral conveying pipe; 16—hollow plastic ball; 17—titanium dioxide powder layer; 18—aeration pipe; 19—aeration fan. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] The method for treating aquaculture tail water containing antibiotics of the present invention is as follows: Figure 1 As shown, the following steps are included:

[0036] S1. Take samples to test the content of various types of antibiotics in aquaculture effluent, and take antibiotics with a content greater than or equal to 10 ng / L as the main antibiotics, and antibiotics with a content less than 10 ng / L as the secondary antibiotics.

[0037] S2. For each category of main antibiotics, select the corresponding adsorption material and prepare it as an adsorption filler. For example, when the main antibiotics include tetracyclines, fluoroquinolones and sulfonamides, three adsorption fillers are prepared. Specifically, modified sodium acid adsorption material can be used as the adsorption material for tetracyclines, biochar adsorbent can be used as the adsorption material for fluoroquinolones, and graphene composite materials can be used as the adsorption material for sulfonamides. When the main antibiotics are other categories of antibiotics, the corresponding existing adsorption materials can be selected.

[0038] S3. The tail water of aquaculture is passed through each adsorption filler in turn, and the main antibiotics of each category are absorbed in turn by the adsorption material. According to the content of each category of main antibiotics, the main antibiotics with higher content are adsorbed first, and then the main antibiotics with lower content are adsorbed. After adsorption treatment, most of the main antibiotics can be removed.

[0039] S4. Then, the aquaculture tail water is passed into a photocatalytic treatment facility to decompose the secondary antibiotics and the residual primary antibiotics. In the photocatalytic treatment facility, under the conditions of light and catalyst, the antibiotics can be decomposed to achieve the removal of the residual antibiotics.

[0040] S5. In order to ensure the removal effect, the content of each category of antibiotics at the outlet, if the content of each category of antibiotics is lower than the first threshold, the aquaculture effluent will be discharged into the natural water body or recycled; if the content of a certain category of antibiotics is higher than or equal to the first threshold and lower than the second threshold, the aquaculture effluent will be passed into the corresponding adsorption filler or photocatalytic treatment facility again; if the content of a certain category of antibiotics is higher than or equal to the second threshold, the corresponding adsorption filler will be replaced.

[0041] Among them, the first threshold is the antibiotic content value that is harmless to the environment. When the content of each category of antibiotics is lower than the first threshold, it means that all types of antibiotics are effectively removed, and the aquaculture tail water can be discharged, or the tail water can be re-entered into the aquaculture facility for reuse. The first threshold can be 1 ng / L. The second threshold is used to judge the adsorption effect of the adsorption filler and the treatment effect of the photocatalytic treatment facility. When only the content of a certain type of main antibiotic exceeds the second threshold, and the content of other types of antibiotics is lower than the first threshold, it indicates that other types of antibiotics are fully removed, but the main antibiotics of this type are not fully removed, indicating that the adsorption filler of this type of main antibiotics has reached saturation, so a new adsorption filler needs to be replaced; when the content of multiple antibiotics exceeds the second threshold at the same time, it indicates that the treatment facility may have a fault, and the adsorption filler and the photocatalytic treatment facility are repaired. In the present invention, the second threshold can be 5 ng / L.

[0042] In the process of aquaculture, it is usually necessary to apply a variety of different types of antibiotics, such as tetracyclines, fluoroquinolones, sulfonamides, chloramphenicol, etc. Different antibiotics can prevent and treat different bacteria to ensure the health of aquaculture products, and the application amount of each type of antibiotics is different. Therefore, there are a variety of antibiotics remaining in the tail water of aquaculture, and the content of different types of antibiotics is different. Antibiotics with higher content are taken as the main antibiotics. The main antibiotics are first adsorbed to remove most of the main antibiotics, and then all antibiotics are photocatalytically treated to promote the decomposition of antibiotics of various types, thereby improving the removal effect of antibiotics.

[0043] In the present invention, in order to facilitate the disassembly and assembly of the adsorption filler, the adsorption filler is as follows Figure 2 As shown, it includes a frame 1, and water-permeable positioning layers 2 are arranged on both sides of the frame 1, and an adsorption layer 3 is arranged between the water-permeable positioning layers 2. The frame 1 is a rectangular metal frame or a plastic frame, and the water-permeable positioning layer 2 can be made of one or more layers of water-permeable cloth, such as carbon fiber cloth. The adsorption layer 3 is used to adsorb the adsorption material of the antibiotic. During installation, the entire adsorption filler can be installed in the adsorption facility through the frame 1.

[0044] Specifically, the frame 1 can be detachably installed in the processing groove 4. Figure 3 As shown, the inner cavity cross-section of the processing groove 4 is rectangular, and slots can be set on the side walls and bottom walls of the processing groove 4. The bottom edge and two side edges of the frame 1 can be inserted into the slots, which is very convenient for disassembly and assembly.

[0045] In step S5, when the content of a certain category of antibiotics is higher than or equal to the second threshold value and the content of other categories of antibiotics is lower than the first threshold value, it indicates that the corresponding adsorption filler is close to or has reached a saturation state. At this time, the corresponding adsorption filler is removed and replaced with a new adsorption filler to ensure the adsorption effect.

[0046] In order to reduce the operating cost and recycle the adsorption filler that has reached the saturated state, the present invention sequentially places the removed adsorption filler into the alkaline cleaning tank 5, the ethanol cleaning tank 6 and the clean water cleaning tank 7. Figure 4 As shown, an ultrasonic generator 8 is provided in the alkaline cleaning tank 5, the ethanol cleaning tank 6 and the clean water cleaning tank 7, a photocatalyst is provided in the alkaline cleaning tank 5, and a light supplement device 9 is provided inside or on the top of the alkaline cleaning tank 5. In the alkaline cleaning tank 5, the ultrasonic generator 8 emits ultrasonic waves to the adsorption layer 3, and the antibiotics adsorbed by the adsorption layer 3 are separated from the adsorption layer 3 and decomposed under the conditions of the photocatalyst and light; in the ethanol cleaning tank 6, the ultrasonic generator 8 emits ultrasonic waves to the adsorption layer 3, and the antibiotics adsorbed by the adsorption layer 3 react with ethanol and are separated from the adsorption layer 3; in the clean water cleaning tank 7, the adsorption layer 3 is cleaned and can be used again after cleaning.

[0047] In the alkaline cleaning tank 5, the cleaning liquid is lime water, which is low in cost. Some antibiotics (such as tetracycline antibiotics) can react with calcium ions to generate water-insoluble substances, thereby removing the antibiotics adsorbed by the adsorption layer 3. In the ethanol cleaning tank 6, the cleaning liquid is an ethanol solution with a concentration of 0.75mL / mL. Some antibiotics can react with ethanol in a disulfiram-like manner, thereby consuming the antibiotics adsorbed by the adsorption layer 3. The cleaning liquid in the clean water cleaning tank 7 is clean water, which is used to clean the adsorption filler and remove impurities such as ethanol.

[0048] In order to improve the removal efficiency of antibiotics, the present invention provides an ultrasonic generator 8 in the alkaline cleaning tank 5, the ethanol cleaning tank 6 and the clean water cleaning tank 7. The ultrasonic generator 8 emits ultrasonic waves to the adsorption layer 3, generating a cavitation effect and prompting the antibiotics adsorbed by the adsorption layer 3 to quickly enter the cleaning solution.

[0049] In order to ensure that the antibiotics entering the alkaline cleaning tank 5 are fully decomposed, a photocatalyst is arranged in the alkaline cleaning tank 5, and a light supplement device 9 is arranged inside or on the top of the alkaline cleaning tank 5 to decompose the antibiotics by photocatalysis.

[0050] In the present invention, Figures 5 to 8 As shown, the photocatalytic treatment facility includes a treatment tank 10, the water inlet end of the treatment tank 10 is connected to the water outlet end of the treatment ditch 4, the cross-section of the treatment tank 10 is 3 / 4 circular, the notch of the treatment tank 10 faces upward, and the inner wall of the treatment tank 10 is provided with a reflective layer 12. An arc-shaped convex lens 11 is provided above the treatment tank 10, and the focus of the convex lens 11 is located at the center of the treatment tank 10. In order to ensure the decomposition effect of antibiotics, the water flow in the treatment tank 10 should not be too large. Specifically, the water depth is less than or equal to 0.4m, and the flow rate is less than or equal to 0.1m / s. A photocatalyst is provided inside the treatment tank 10.

[0051] Conventional photocatalytic treatment facilities all require a light source to provide sufficient light, and the operating energy consumption is high. In the present invention, the focusing effect of the convex lens 11 is used to gather sunlight. The light collected by the convex lens 11 enters the treatment tank 10 from the notch of the treatment tank 10, and then irradiates into the water, promoting the photocatalyst to produce strong oxidizing substances such as hydroxyl radicals, which can decompose organic matter such as antibiotics in the water. After the convex lens 11 focuses the light, the light intensity in the treatment tank 10 is high, and there is no need to set up lamps, which reduces the energy consumption during operation and ensures the photocatalytic effect. In addition, when the light enters the water, it will be reflected and refracted, and then pass through the water body to reach the inner wall of the treatment tank 10. The present invention sets a reflective layer 12 on the inner wall of the treatment tank 10. The light that reaches the inner wall of the treatment tank 10 after reflection from the water surface and passes through the water body to reach the inner wall of the treatment tank 10 can be reflected into the water under the action of the reflective layer 12, further improving the photocatalytic effect. The processing tank 10 is set to be a 3 / 4 circle, so that the inner wall of the entire processing tank 10 is a concave surface with a focusing effect, and the light reflected by the reflective layer 12 is also located in the processing tank 10, ensuring the utilization rate of the light. A plurality of convex lenses 11 can be set, and they are evenly arranged along the length direction of the processing tank 10.

[0052] The treatment facility of the present invention can also be operated intermittently, and does not need to be operated continuously. Aquaculture tail water does not need to be discharged every day, but can be discharged during the day when the weather is clear, and the photocatalytic demand can be met by using natural light.

[0053] In order to ensure that the photocatalyst is in uniform and full contact with water, the photocatalyst is a suspended particle, that is, the photocatalyst can be suspended in water. Under the action of water flow, the photocatalyst will move with the water flow. In order to promote the recycling of the photocatalyst, the water outlet of the treatment tank 10 is provided with an inclined recovery tank 13, the bottom wall of the recovery tank 13 is provided with a plurality of water filtering holes, and the lower end of the recovery tank 13 is provided with a recovery box 14, and the recovery box 14 is connected to the water inlet end of the treatment tank 10 through a spiral conveying pipe 15. A rotating shaft is arranged inside the spiral conveying pipe 15, one end of the rotating shaft is provided with a motor, and the outer wall of the rotating shaft is provided with a spiral conveying sheet. When the motor drives the rotating shaft and the conveying sheet to rotate, the solid material inside the spiral conveying pipe 15 can be pushed to move axially. A water collecting tank can be arranged below the recovery tank 13, and the water in the treatment tank 10 enters the recovery tank 13 when it reaches the water outlet, and the granular photocatalyst falls down along the recovery tank 13 into the recovery box 14, and then returns to the water inlet end of the treatment tank 10 under the action of the spiral conveying pipe 15 to achieve circulation. The water in the recovery tank 13 falls down into the water collection tank through the water filter hole. When the content of a certain antibiotic in the water discharged from the treatment tank 10 is higher than or equal to the first threshold value and lower than the second threshold value, in order to facilitate the water to be transported to the corresponding adsorption filler again, a water pump can be set in the water collection tank. The water pump is connected to the treatment ditch 4 upstream of each adsorption filler through multiple pipes, and a valve is set on each pipe to control the flow path of the water.

[0054] The photocatalyst includes a hollow plastic ball 16, the outer surface of the hollow plastic ball 16 is sprayed with a titanium dioxide powder layer 17, and the overall density of the hollow plastic ball 16 and the titanium dioxide powder layer 17 is 0.95 to 1.08 g / cm 3 The density of the hollow plastic ball 16 is less than that of water, and the density of the titanium dioxide powder layer 17 is greater than that of water. By spraying the titanium dioxide powder layer 17 onto the surface of the hollow plastic ball 16 and controlling the spraying amount of the titanium dioxide powder, the overall density of the hollow plastic ball 16 and the titanium dioxide powder layer 17 can be adjusted, so that the photocatalyst can be suspended in water and is not easy to sink to the bottom or float.

[0055] In order to increase the oxygen content, an aeration pipe 18 is provided at the bottom of the treatment tank 10, and the aeration pipe 18 is connected to an aeration fan 19, and a plurality of aeration holes are provided on the aeration pipe 18. External air is transported to the aeration pipe 18 by the aeration fan 19, and then enters the water through the aeration holes, thereby increasing the oxygen content in the water and causing disturbance to the water, thereby promoting full contact between the water and the photocatalyst.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating aquaculture tail water containing antibiotics, characterized in that: The following steps are involved: S1. Sample and test the content of various types of antibiotics in aquaculture tail water, and take antibiotics with a content greater than or equal to 10ng / L as the main antibiotics, and antibiotics with a content less than 10ng / L as the secondary antibiotics; S2. For each category of main antibiotics, select corresponding adsorption materials and prepare them as adsorption fillers; S3, passing the aquaculture tail water into each adsorption filler in turn, and using the adsorption material to absorb each type of main antibiotics in turn; S4, then passing the aquaculture tail water into a photocatalytic treatment facility to decompose the secondary antibiotics and residual primary antibiotics; The photocatalytic treatment facility comprises a treatment tank (10), the cross section of the treatment tank (10) is 3 / 4 circular, and the inner wall of the treatment tank (10) is provided with a reflective layer (12); an arc-shaped convex lens (11) is provided above the treatment tank (10), and the focus of the convex lens (11) is located at the center of the treatment tank (10); the water depth in the treatment tank (10) is less than or equal to 0.4m, and the flow rate is less than or equal to 0.1m / s; and a photocatalyst is provided inside the treatment tank (10); S5. Detect the content of various types of antibiotics at the outlet of the photocatalytic treatment facility. If the content of various types of antibiotics is lower than the first threshold, the aquaculture effluent is discharged into the natural water body or recycled. If the content of a certain type of antibiotics is higher than or equal to the first threshold and lower than the second threshold, the aquaculture effluent is again passed into the corresponding adsorption filler or photocatalytic treatment facility. If the content of a certain type of antibiotics is higher than or equal to the second threshold, the corresponding adsorption filler is replaced.

2. The method for treating aquaculture tail water containing antibiotics according to claim 1, characterized in that: The adsorption filler comprises a frame (1), water-permeable positioning layers (2) are arranged on both sides of the frame (1), and an adsorption layer (3) is arranged between the water-permeable positioning layers (2).

3. The method for treating aquaculture tail water containing antibiotics according to claim 2, characterized in that: The frame (1) is detachably mounted in the processing groove (4); In step S5, when the content of a certain type of antibiotic is higher than or equal to a second threshold value, the corresponding adsorption filler is removed and placed in an alkaline cleaning tank (5), an ethanol cleaning tank (6) and a clean water cleaning tank (7) in sequence, wherein the alkaline cleaning tank (5), the ethanol cleaning tank (6) and the clean water cleaning tank (7) are each provided with an ultrasonic generator (8), the alkaline cleaning tank (5) is provided with a photocatalyst, and a light supplement device (9) is provided inside or on the top of the alkaline cleaning tank (5); In the alkaline cleaning tank (5), the ultrasonic generator (8) emits ultrasonic waves to the adsorption layer (3), and the antibiotics adsorbed by the adsorption layer (3) are separated from the adsorption layer (3) and decomposed under the conditions of photocatalysis and light; In the ethanol cleaning tank (6), the ultrasonic generator (8) emits ultrasonic waves to the adsorption layer (3), and the antibiotics adsorbed on the adsorption layer (3) react with the ethanol, thereby being separated from the adsorption layer (3); In the clean water cleaning tank (7), the adsorption layer (3) is cleaned and can be used again after cleaning.

4. The method for treating aquaculture tail water containing antibiotics according to claim 1, characterized in that: The photocatalyst is suspended particles. The water outlet of the treatment tank (10) is provided with an inclined recovery tank (13). The bottom wall of the recovery tank (13) is provided with a plurality of water filtering holes. The lower end of the recovery tank (13) is provided with a recovery box (14). The recovery box (14) is connected to the water inlet end of the treatment tank (10) via a spiral conveying pipe (15).

5. The method for treating aquaculture tail water containing antibiotics according to claim 4, characterized in that: The photocatalyst comprises a hollow plastic sphere (16), the outer surface of the hollow plastic sphere (16) is sprayed with a titanium dioxide powder layer (17), and the overall density of the hollow plastic sphere (16) and the titanium dioxide powder layer (17) is 0.95 to 1.08 g / cm 3 .

6. The method for treating aquaculture tail water containing antibiotics according to claim 1, characterized in that: An aeration pipe (18) is provided at the bottom of the treatment tank (10), the aeration pipe (18) is connected to an aeration fan (19), and a plurality of aeration holes are provided on the aeration pipe (18).

7. The method for treating aquaculture tail water containing antibiotics according to claim 1, characterized in that: The first threshold is 1 ng / L, and the second threshold is 5 ng / L.

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