Filtering device for aquaculture wastewater treatment

Abstract

The utility model relates to cultivation wastewater treatment, and discloses a filtering device for cultivation wastewater treatment, which comprises a filtering bin, a composite filtering layer is arranged in the filtering bin, and the composite filtering layer comprises a plurality of common filtering membrane layers and carbon nano tube filtering layer groups arranged between the adjacent common filtering membrane layers. Each carbon nanotube filter layer group comprises a plurality of carbon nanotube filter layers; the carbon nano tube filter layer comprises a base layer, two protective layers located on the upper side and the lower side of the base layer respectively, and a carbon nano tube composite material layer located between the base layer and the two protective layers, and is obtained through hot pressing and compounding. A positive pressure air inlet device and an air pressure sensor are also arranged at the top of the filtering bin. According to the filtering device, a common filtering membrane is combined with a carbon nano tube filtering layer, residual antibiotics and pathogens in aquaculture wastewater are removed by utilizing excellent adsorption performance and bactericidal activity of carbon nano tubes, and the influence of aquaculture wastewater discharge on human and environment is reduced; the device can also perform positive pressure filtration, so that the filtration efficiency is ensured.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a filtration device for treating aquaculture wastewater. Background Technology

[0002] As people's living standards improve, the demand for various types of meat is increasing, prompting the rapid development of the livestock industry and the expansion of farming scale. However, the daily treatment and discharge of wastewater from these farms has become a problem. Livestock wastewater contains large amounts of solid pollutants, harmful bacteria, and antibiotic residues. If discharged into nearby waterways without treatment, it can cause serious water pollution, disrupt the balance of the ecosystem, and potentially spread certain infectious diseases. Therefore, proper treatment of livestock wastewater is essential.

[0003] Chinese utility model patent CN214528473U discloses a wastewater treatment device for livestock and poultry farming, which uses chemical flocculation and multi-layer filtration to remove solid impurities from the wastewater. This patented technology combines chemical and physical methods to treat solid impurities in livestock and poultry wastewater. However, this device has significant limitations in the field of livestock and poultry wastewater treatment, namely, its limited ability to remove antibiotics dissolved in the wastewater and its limited bactericidal performance. This is because livestock and poultry wastewater differs significantly from ordinary domestic sewage in terms of pollutants, primarily due to the presence of large amounts of antibiotics and pathogens. Current livestock and poultry wastewater treatment devices are unable to effectively remove these antibiotics and pathogens.

[0004] To address the aforementioned issues, it is particularly important and urgent to develop a filtration device specifically designed for removing antibiotics and pathogens from aquaculture wastewater. Utility Model Content

[0005] This invention provides a novel filtration device for treating aquaculture wastewater that can effectively remove antibiotic residues and pathogens from aquaculture wastewater, preventing these residues from affecting the local ecological environment and human life during discharge.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] This utility model provides a filtration device for treating aquaculture wastewater, including a filtration chamber, wherein a composite filtration layer is provided in the filtration chamber, the composite filtration layer includes a plurality of ordinary filtration membrane layers and a group of carbon nanotube filtration layers disposed between adjacent ordinary filtration membrane layers.

[0008] Preferably, each carbon nanotube filter layer group includes multiple carbon nanotube filter layers, preferably at least 5; the carbon nanotube filter layer includes a base layer, two protective layers located on the upper and lower sides of the base layer respectively, and a carbon nanotube composite material layer between the base layer and the two protective layers, which are obtained by hot pressing; the base layer is made of one of polypropylene (PP), polyamide (PA), polyethylene (PE), and polyvinylidene fluoride (PVDF), the carbon nanotube composite material layer is made of biochar-carbon nanotube composite material layer, and the protective layer is made of PET nonwoven fabric or PTFE nonwoven fabric.

[0009] Preferably, the ordinary filter membrane layer is provided with 2-6 layers, and more preferably 4 layers.

[0010] Preferably, the number of filter layers in the downstream carbon nanotube filter layer group is greater than the number of filter layers in the upstream carbon nanotube filter layer group.

[0011] Preferably, the filter chamber is further provided with a metal filter screen, and the composite filter layer is disposed on the metal filter screen.

[0012] Preferably, the filter chamber is equipped with a wastewater spraying device for spraying aquaculture wastewater onto the composite filter layer. The top of the filter chamber is equipped with an air inlet pipe and the bottom is equipped with a water outlet pipe. More preferably, the wastewater spraying device includes a water inlet pipe with several nozzles. The water inlet end of the water inlet pipe extends to the outside of the filter chamber and is equipped with a water inlet valve.

[0013] Preferably, the filter chamber is also equipped with a hydraulic sensor to monitor the level of aquaculture wastewater in the filter chamber, so that the filter chamber maintains an appropriate amount of wastewater to meet the filtration requirements.

[0014] Preferably, the top of the filter chamber is also provided with a positive pressure air intake device and a pressure sensor. The measuring probe of the pressure sensor extends into the filter chamber, and the positive pressure air intake device can be an air compressor.

[0015] Preferably, the filter chamber includes a chamber body and a chamber cover, and the chamber body and the chamber cover are connected by a detachable sealed connection.

[0016] Preferably, the bottom of the filter chamber is also provided with an ultrasonic cleaner and a cleaning drain pipe, and the side wall of the filter chamber is provided with a sewage pipe, which is aligned with the upper surface of the composite filter layer.

[0017] Compared with the prior art, the technical solution of this utility model has the following advantages or beneficial effects:

[0018] (1) On the basis of ordinary filter membrane, a carbon nanotube filter layer is added to adsorb antibiotic residues in wastewater. At the same time, the bactericidal properties of the carbon nanotube filter layer are used to kill pathogens in aquaculture wastewater. The treatment effect is good. It can not only remove heavy metals in aquaculture wastewater, but also effectively remove antibiotics and pathogens in aquaculture wastewater, avoiding water pollution after wastewater discharge.

[0019] (2) When the filtration speed of aquaculture wastewater in the filter chamber is slow, the pressure difference between the upper and lower parts of the composite filter layer in the filter chamber can be increased by turning on the air compressor to speed up the filtration speed and improve the filtration efficiency.

[0020] (3) This device also has a drain pipe for discharging solid impurities in the filter chamber. An ultrasonic cleaner is also installed at the bottom of the chamber, which can be used to perform ultrasonic cleaning on the chamber to remove impurities remaining on the carbon nanotube filter layer and remove some of the antibiotics adsorbed by the carbon nanotubes, thereby increasing the service life of the multi-layer carbon nanotube filter layer and reducing the frequency of replacement and maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the filter chamber.

[0022] Figure 2 This is a schematic diagram of the water inlet pipe spray device.

[0023] Figure 3 This is a schematic diagram of the composite filter layer.

[0024] Figure 4 This is a schematic diagram of an air compressor.

[0025] Figure 5 This is a schematic diagram of the structure of a carbon nanotube filter layer.

[0026] Figure 6 This is a schematic diagram of the microstructure of a biochar-carbon nanotube composite material; in the figure, the ellipsoid represents biochar particles and the short curve represents carbon nanotubes.

[0027] In the diagram: 1. Compartment cover; 2. Pressure sensor; 3. Inlet valve; 4. Inlet filter; 5. Inlet pipe; 6. Compartment sealing structure; 7. Nozzle; 8. Hydraulic sensor; 9. Drain valve; 10. Drain pipe; 11. Composite filter layer; 12. Support frame; 13. Compartment; 14. Ultrasonic cleaner; 15. Cleaning drain valve; 16. Cleaning drain pipe; 17. Outlet pipe; 18. Outlet valve; 19. Observation window; 20. Bracket; 21. Air compressor; 22. Positive pressure valve; 23. Inlet valve; 24. Inlet pipe; 1101. Ordinary filter membrane layer; 1102. Carbon nanotube filter layer; 1102a. Base layer; 1102b. Carbon nanotube composite material layer; 1102c. Protective layer; 25. Metal filter. Detailed Implementation Plan

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "connected," "installed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] First, this utility model will describe in detail the structural features of the composite filter layer 11.

[0032] like Figures 1 to 4 The composite filter layer 11 includes several ordinary filter membrane layers 1101 and a group of carbon nanotube filter layers disposed between adjacent ordinary filter membrane layers 1101. The ordinary filter membrane layers 1101 are generally arranged in 2-6 layers. The material of the ordinary filter membrane layers 1101 can be one of polypropylene (PP), polyethersulfone (PES), or mixed cellulose ester (MCE). The ordinary filter membrane layers 1101 are used to protect the inner carbon nanotube filter layers. Each carbon nanotube filter layer assembly comprises at least five carbon nanotube filter layers 1102. Each carbon nanotube filter layer 1102 includes a base layer 1102a, two protective layers 1102c located on the upper and lower sides of the base layer 1102a respectively, and a carbon nanotube composite material layer 1102b between the base layer 1102a and the two protective layers 1102c. The base layer 1102a is made of one of polypropylene (PP), polyamide (PA), or polyethylene (PE). The carbon nanotube composite material layer 1102b is made of biochar-carbon nanotube composite material. The protective layers 1102c are made of PET nonwoven fabric or PTFE nonwoven fabric. The edges of each layer within the carbon nanotube filter layer are sealed with epoxy resin to prevent lateral leakage of wastewater and ensure vertical water flow. The base layer 1102a, the carbon nanotube composite material layer 1102b, and the protective layers 1102c are bonded together by hot pressing to obtain the carbon nanotube filter layer 1102. Hot pressing is an existing technology and will not be described in detail here.

[0033] Along the flow direction of aquaculture wastewater, the downstream carbon nanotube filter layer has a greater number of carbon nanotube filter layers than the upstream carbon nanotube filter layer. This arrangement serves two purposes: the upstream carbon nanotube filter layer prioritizes the interception of large particulate pollutants, thereby extending the overall lifespan of the composite filter layer 11 and reducing initial resistance, allowing wastewater to pass through the upstream filter layer more quickly; the interception of large particles in the upper layer effectively reduces deep-seated pollution, alleviating downstream clogging and reducing the frequency of backwashing and replacement; and the longer contact time between the downstream carbon nanotube filter layer and the aquaculture wastewater allows for more efficient removal of minute pollutants (such as antibiotic molecules, heavy metal ions, and other small organic molecules), ensuring high-quality effluent.

[0034] This utility model also provides a preferred arrangement of the composite filter layer 11, wherein four ordinary filter membrane layers 1101 are provided, and three groups of carbon nanotube filter layer groups are provided, distributed among the four ordinary filter membrane layers 1101. For ease of description, the carbon nanotube filter layer groups are referred to as the first carbon nanotube filter layer group, the second carbon nanotube filter layer group, and the third carbon nanotube filter layer group from top to bottom. The first carbon nanotube filter layer group includes five carbon nanotube composite filter layers 1102, the second carbon nanotube filter layer group includes nine carbon nanotube composite filter layers 1102, and the third carbon nanotube filter layer group includes twelve carbon nanotube composite filter layers 1102. In the carbon nanotube composite filter layer 1102, the base layer 1102a is made of polypropylene filter mesh (pore size 100–500 μm), the carbon nanotube composite material layer 1102b is made of biochar-carbon nanotube composite material layer (such as Chinese invention patent application CN118495514A), and the protective layer 1102c is made of PET nonwoven fabric (pore size 10-50 μm).

[0035] The adsorption mechanism of antibiotics and pathogens by the biochar-carbon nanotube composite layer is as follows:

[0036] 1) The adsorption treatment of antibiotics and pathogens by biochar mainly manifests in five aspects: physical adsorption, chemical adsorption, chemical modification and enhancement, physical retention, and chemical oxidation. ① Physical adsorption: The porous structure (micropores / mesopores) of biochar can retain antibiotic molecules or pathogens (such as bacteria and viruses), and is suitable for hydrophobic antibiotics (such as fluoroquinolones). ② Chemical adsorption: The surface functional groups (-COOH, -OH) of biochar adsorb polar antibiotics (such as sulfonamides) through hydrogen bonding and electrostatic interactions. ③ Chemical modification and enhancement: Biochar is loaded with metal oxides such as Fe and Mg, which adsorb antibiotics through coordination bonds (such as tetracycline-Fe³⁺ complex). ④ Physical retention: The macroporous structure of biochar can capture bacteria (>1μm). ⑤ Chemical oxidation: The persistent free radicals (PFRs) on the surface of biochar generate reactive oxygen species (•OH), which can destroy the cell membrane of pathogens.

[0037] 2) The adsorption and treatment of antibiotics and pathogens by carbon nanotubes (CNTs) are mainly reflected in four aspects: conjugate adsorption, hydrophobic interaction, physical puncture, and oxidative stress: ① Conjugate adsorption: The sp² carbon network of carbon nanotubes forms π-π conjugation with antibiotics containing benzene rings (such as sulfamethoxazole), which enhances the adsorption performance of carbon nanotubes; ② Hydrophobic interaction: The special structure of carbon nanotubes has hydrophobic interaction and strong adsorption capacity for non-polar antibiotics (such as chloramphenicol); ③ Physical puncture: The nanoneedle-like structure of carbon nanotubes can puncture the bacterial cell wall (more effective against Gram-positive bacteria); ④ Oxidative stress: The reactive oxygen species (ROS) generated by catalysis can destroy the nucleic acids / proteins of pathogens.

[0038] 3) Biochar-CNT binding:

[0039] By utilizing the porous structure of biochar and the high specific surface area of ​​CNTs, the adsorption of pollutants (heavy metals, organic matter) is enhanced; low-resistance fluid transport is achieved through the nanochannels of CNTs and the mesoporous / macroporous structure of biochar; the surface functional groups of biochar and the conductivity of CNTs are combined to improve the filter layer's resistance to biofouling; and the use of biochar-carbon nanotube composite materials can adsorb various types of antibiotics and pathogens, while also destroying the cell membranes and nucleic acids of pathogens, thus inhibiting their growth and reproduction.

[0040] Next, this utility model will describe in detail the features of other structures in the filtration device besides the composite filter layer 11.

[0041] like Figures 1 to 4This utility model discloses a filtration device for treating aquaculture wastewater, comprising a chamber cover 1, a pressure sensor 2, an inlet valve 3, an inlet filter screen 4, an inlet pipe 5, a chamber sealing structure 6, a nozzle 7, a hydraulic sensor 8, a drain valve 9, a drain pipe 10, a composite filter layer 11, a support frame 12, a chamber body 13, an ultrasonic cleaner 14, a cleaning drain valve 15, a cleaning drain pipe 16, an outlet pipe 17, an outlet valve 18, an observation window 19, a bracket 20, an air compressor 21, a positive pressure valve 22, an air inlet valve 23, an air inlet pipe 24, and a metal filter screen 25. The chamber body 13 and the chamber cover 1 constitute the main structure of the filtration chamber.

[0042] A metal filter screen 1103 is provided in the lower middle part of the chamber 13. The metal filter screen 1103 is welded to the support frame 12 inside the chamber 13. A composite filter layer 11 is provided above the metal filter screen 1103. The mesh size of the metal filter screen 1103 is preferably 10-20 mesh.

[0043] A pressure sensor 2 is installed on the upper left side of the cover 1. The measuring probe of the pressure sensor 2 extends into the filter chamber. A bracket 20 is fixed on the upper right side of the cover 1, and the air compressor 21 is fixed to the bracket 20 with bolts. An air inlet pipe 24 is provided at the center of the top of the cover 1. The air inlet pipe 24 has two air inlets. One air inlet is connected to the outside air, and the other air inlet is connected to the air compressor. The two air inlets are respectively equipped with an air inlet valve 23 and a positive pressure valve 22. The air pressure in the filter chamber is controlled by the air inlet valve 23 and the positive pressure valve 22. A water inlet pipe 5 is connected to the left side of the cover 1. The inlet of the water inlet pipe 5 is equipped with an inlet valve 3. The water inlet pipe 5 extends into the filter chamber. Multiple nozzles 7 are installed on the section of the water inlet pipe 5 inside the filter chamber. The water inlet pipe 5 and the nozzles 7 form a wastewater spraying device. When the inlet valve 3 is opened, the external aquaculture wastewater enters the filter chamber through the water inlet pipe 5 and is then filtered by the composite filter layer 11. The filtered wastewater flows out through the outlet pipe 17 located at the bottom of the chamber body 13. An outlet valve 18 is also installed on the outlet pipe 17 to regulate the flow rate of the water. A hydraulic sensor 8 and a drain pipe 10 are also installed on the left side of the chamber body 13. The drain pipe 10 is flush with the upper surface of the composite filter layer 11. The hydraulic sensor 8 monitors the wastewater level in the filter chamber in real time. The drain pipe 10 is used to discharge solid impurities that cannot be filtered by the composite filter layer 11. A drain valve 9 is installed on the drain pipe 10.

[0044] The filter chamber mainly consists of a chamber body 13 and a cover 1, which are detachably sealed together via a chamber body sealing structure 6. The chamber body sealing structure 6 comprises a sealing ring and bolts. When filtering aquaculture wastewater under normal pressure, the filter chamber does not need to be sealed (cover 1 is not required); however, when filtering aquaculture wastewater under positive pressure, the filter chamber needs to be sealed to prevent air pressure leakage. Later, the nozzle 7 and carbon nanotube filter layer 1102, and other components inside the filter chamber, can be replaced or repaired by opening the cover 1. The bottom of the chamber 13 also contains multiple ultrasonic cleaners 14 and cleaning drain pipes 16. The ultrasonic cleaners 14 provide ultrasonic cleaning to the chamber 13, effectively removing solid impurities and cleaning the carbon nanotube filter layer, thus improving the service life of the carbon nanotube filter layer. During cleaning, clean water is injected into the filter chamber by a wastewater spray device, and the generated wastewater can be discharged through the cleaning drain pipe 16. The cleaning drain pipe 16 is equipped with a cleaning drain valve 15, which is closed during wastewater filtration and opened when drainage is needed after cleaning. The chamber 13 is also equipped with an observation window 19, which is bolted to the side wall of the chamber 13 and sealed with a sealing ring. Through the observation window 19, the wastewater level and the accumulation of solid impurities in the filter chamber can be observed. The observed wastewater level can be corroborated with the hydraulic sensor 8 to facilitate the determination of whether the inlet flow rate needs to be adjusted and whether sewage needs to be discharged through the drain outlet.

[0045] The process of treating aquaculture wastewater using this utility model filtration device is as follows: First, the air inlet valve 23 is opened, connecting the filter chamber to the outside air, maintaining the air pressure inside the filter chamber at normal pressure. Aquaculture wastewater flows from the inlet pipe 5 through the inlet filter screen 4, filtering out large solid impurities to prevent clogging of the nozzles 7 on the inlet pipe 5. The inlet valve 3 is then opened, and the aquaculture wastewater is evenly sprayed into the filter chamber through the nozzles 7. Some larger particles are intercepted by the ordinary filter membrane layer 1101. During the wastewater flow, antibiotics in the aquaculture wastewater are removed by the multi-layer carbon nanotube filter layer assembly. The bactericidal properties of the carbon nanotube filter layer kill pathogens in the aquaculture wastewater, reducing the impact of aquaculture wastewater discharge on humans and nature. After being filtered and adsorbed by the multi-layer carbon nanotube filter layer assembly, the aquaculture wastewater is discharged from the filter chamber through the outlet pipe 17 below the chamber body 13. The flow rate of the outlet pipe 17 can be controlled by adjusting the outlet valve 18 on the outlet pipe 17. When the filtration speed of the aquaculture wastewater in the filter chamber is slow... The air intake valve 23 can be closed, then the positive pressure valve 22 can be opened and the air compressor 21 can be started. Within the pressure range that the filter chamber can withstand, the pressure inside the filter chamber can be increased, thereby increasing the pressure difference between the wastewater above and below the multi-layer carbon nanotube filter layer, accelerating the filtration speed, and improving the filtration efficiency. On the basis of ordinary filter membrane, carbon nanotubes and other materials are added to adsorb antibiotic residues in wastewater. At the same time, the bactericidal properties of carbon nanotubes are used to kill pathogens in aquaculture wastewater. The treatment effect is good, and it can effectively remove antibiotics and pathogens from wastewater, avoiding water pollution. This device is also equipped with a drain pipe 10 to discharge solid impurities intercepted by the composite filter layer 11 in the filter chamber when cleaning the composite filter layer 11. An ultrasonic cleaner is also provided at the bottom of the filter chamber, which can be used to perform ultrasonic cleaning of the filter chamber to remove impurities remaining on the composite filter layer 11 and remove some of the antibiotics adsorbed by the carbon nanotube filter layer 1101, reducing the frequency of replacement and maintenance of the composite filter layer 11.

[0046] It should be noted that, although Figures 1 to 4 The filter device shown includes many structures or components, but it does not mean that every filter device needs to be equipped with or have the above structures or components installed. Those skilled in the art can selectively set or install the above structures or components for the filter device according to actual functional needs. Specific implementation method one;

[0048] This embodiment is atmospheric pressure filtration. During atmospheric pressure filtration, the filtration device may not require an air compressor 21; or the positive pressure valve 22 may be closed before filtration, while the air inlet valve 23 is opened simultaneously. During filtration, the inlet valve 3 and outlet valve 18 are opened first. The aquaculture wastewater is initially filtered through the inlet filter screen 4 via the inlet pipe 5, then sprayed into the filter chamber through the nozzle 7 installed on the inlet pipe 5. After further filtration through the carbon nanotube filter layer, it flows out through the outlet pipe 17. During the filtration process, the water level of the aquaculture wastewater in the filter chamber can be determined through the observation window 19 and the hydraulic sensor 8. The inlet flow rate is adjusted by regulating the inlet valve 3, and the outlet flow rate is adjusted by regulating the outlet valve 18, ensuring that the wastewater level in the filter chamber remains within a suitable range. Specific implementation method two;

[0050] This embodiment is a pressurized filtration. During pressurized filtration, the filter chamber needs to be sealed, and an air compressor 21 is also required. Based on the first specific embodiment, the inlet valve 23 is closed, the positive pressure valve 22 is opened, and the air compressor 21 is simultaneously turned on to increase the gas pressure inside the filter chamber, thereby increasing the pressure difference across the composite filter layer 11, accelerating the filtration speed, improving filtration efficiency, and increasing the daily wastewater treatment capacity. Specific implementation method three;

[0052] This embodiment includes ultrasonic cleaning as an extension of specific embodiment one or two. When a large amount of solid impurities are observed to accumulate on the composite filter layer 11 through the observation window 19, or when the composite filter layer 11 has been used many times, it is necessary to clean the composite filter layer 11 in the filter chamber in a timely manner. Before cleaning, first open the air inlet valve 23 and the water inlet valve 3, close other valves, connect the water inlet pipe 5 to clean water or tap water, and continuously spray clean water or tap water onto the composite filter layer 11. At the same time, turn on the ultrasonic cleaner to clean the composite filter layer 11 for a period of time (10 minutes). First, open the drain valve 9 to remove the solid impurities on the composite filter layer 11, and then open the cleaning drain valve 15 to remove the remaining cleaning wastewater. Repeat the above process 2 to 3 times to fully remove the impurities and antibiotics adsorbed on the carbon nanotube filter layer and improve the service life of the carbon nanotube filter layer.

[0053] In other specific embodiments, the inner layer of the filter chamber of the filter device is coated with an anti-rust layer to reduce the corrosive effect of aquaculture wastewater on the chamber body 13 and extend its service life. The outer layer of the filter chamber is coated with an anti-rust coating to reduce the corrosive effect of the external environment on the device.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A filter device for aquaculture wastewater treatment comprising a filter bin, characterized by: The filter chamber is equipped with a composite filter layer, which includes several ordinary filter membrane layers and a group of carbon nanotube filter layers disposed between adjacent ordinary filter membrane layers.

2. The filter device for aquaculture wastewater treatment according to claim 1, characterized in that: Each carbon nanotube filter layer assembly includes multiple carbon nanotube filter layers; each carbon nanotube filter layer includes a base layer, two protective layers located on the upper and lower sides of the base layer respectively, and a carbon nanotube composite material layer between the base layer and the two protective layers, which are obtained by hot pressing; the base layer is made of one of polypropylene, polyamide, polyethylene, and polyvinylidene fluoride, the carbon nanotube composite material layer is made of biochar-carbon nanotube composite material, and the protective layer is made of PET nonwoven fabric or PTFE nonwoven fabric.

3. The filter device for aquaculture wastewater treatment according to claim 2, characterized in that: The ordinary filter membrane layer is composed of 2-6 layers.

4. The filter device for aquaculture wastewater treatment according to claim 3, characterized in that: The number of filter layers in the downstream carbon nanotube filter layer group is greater than the number of filter layers in the upstream carbon nanotube filter layer group.

5. The filter device for aquaculture wastewater treatment according to claim 4, characterized in that: The filter chamber is also equipped with a metal filter screen, and the composite filter layer is disposed on the metal filter screen.

6. The filter device for aquaculture wastewater treatment according to claim 5, characterized in that: The filter chamber is equipped with a wastewater spraying device that sprays aquaculture wastewater onto the composite filter layer. The top of the filter chamber is equipped with an air inlet pipe, and the bottom is equipped with a water outlet pipe.

7. The filter device for aquaculture wastewater treatment according to claim 6, characterized in that: The filter chamber is also equipped with a hydraulic sensor to monitor the level of aquaculture wastewater inside the filter chamber.

8. The filter device for aquaculture wastewater treatment according to any one of claims 1-7, characterized in that: The top of the filter chamber is also equipped with a positive pressure air intake device and a pressure sensor, with the measuring probe of the pressure sensor extending into the filter chamber.

9. The filter device for aquaculture wastewater treatment according to claim 8, characterized in that: The filter chamber includes a chamber body and a chamber cover, which are connected by a detachable sealed connection.

10. The filter device for aquaculture wastewater treatment according to any one of claims 1-9, characterized in that: The bottom of the filter chamber is also equipped with an ultrasonic cleaner and a cleaning drain pipe, and the side wall of the filter chamber is equipped with a sewage pipe, which is aligned with the upper surface of the composite filter layer.

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