Tail water treatment device for purifying aquaculture water

Abstract

The present application discloses a tailwater treatment device for purifying aquaculture water, belonging to the field of sewage purification. The tailwater treatment device includes: a physical filtration module, including a first placement box and a filtration structure, the first placement box being formed with a tailwater inlet and a first drain outlet; an algae purification module, including a second placement box and an algae screen structure, the second placement box being connected to the first drain outlet and forming a second drain outlet; a fungus purification module, including a third placement box and a live rock structure, the third placement box being connected to the second drain outlet and forming a tailwater drain outlet; the algae screen structure including an attachment plate provided with micropores and algae provided on the attachment plate, the attachment plate being detachably provided on the inner wall of the second placement box, and the second placement box being detachably connected to the first placement box and the third placement box. The application of the present application allows the attachment plate to be easily removed for cleaning, thereby preventing a large amount of algae from flowing into the aquaculture water.

Description

Technical Field

[0001] The present application relates to the technical field of sewage purification, and in particular to a tailwater treatment device for purifying aquaculture water. Background Art

[0002] The tail water discharged from aquaculture often contains a large amount of carbon, nitrogen, phosphorus and other elements, which will cause eutrophication of water bodies, not only polluting the natural environment, but also affecting production and life. Similar to other types of wastewater, the treatment methods of aquaculture tail water can be roughly divided into three categories: physical, chemical and biological. General methods include flocculation, precipitation, filtration or adsorption, etc. In actual life, different methods are often used in combination, and nutrient-rich elements are converted or absorbed and utilized. However, the above scheme will have problems such as high energy consumption, high cost and easy generation of secondary pollutants. In recent years, the technology development based on the concept of bacteria-algae symbiosis has shown good research potential and application prospects. For example, China's public patent CN202211254594.X discloses an apparatus and method for the coordinated treatment of aquaculture tail water by algae and fungi. By inoculating microalgae and using fungi formed by microorganisms in the tail water, a bacteria-algae symbiont can be formed. The bacteria-algae symbiont can simultaneously reduce carbon, nitrogen and phosphorus to achieve tail water treatment.

[0003] However, the solutions of such bacteria and algae co-treatment of tail water in related technologies have the following problems in actual application: the floating algae in the aquaculture water body can reduce nitrogen and phosphorus by absorbing nitrogen and phosphorus elements in the tail water, but the growth and reproduction rate of the floating algae is relatively fast, and the rapidly growing algae are easy to re-enter the aquaculture water body with the recycled tail water, resulting in problems such as deterioration of the water quality of the aquaculture water body, reduction of the oxygen content of the water body, and blockage of the respiratory organs of fish. At present, physical filtering structures are generally set up to prevent algae from circulating into the aquaculture water body, or the amount of algae is controlled by regular salvaging. However, the above solutions are difficult to effectively solve the problems such as deterioration of the water quality of the aquaculture water body caused by excessive growth of algae in the aquaculture water body, and because the algae are easy to adhere to the walls of the water tank and other places, it is difficult to remove them from the aquaculture water environment by means of salvage and other means. Summary of the Invention

[0004] The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a tail water treatment device for purifying aquaculture water.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a tail water treatment device for purifying aquaculture water, the tail water treatment device comprising:

[0006] A physical filtration module, comprising a first placement box and a filtration structure disposed in the first placement box, wherein the first placement box is formed with a tailwater inlet and a first drain outlet lower than the tailwater inlet;

[0007] an algae purification module, comprising a second placement box and an algae screen structure disposed in the second placement box, wherein the second placement box is communicated with the first drain port and forms a second drain port; and

[0008] a fungus purification module comprising a third placement box and a live rock structure disposed within the third placement box, the live rock structure being configured to cultivate aerobic and anaerobic bacteria, the third placement box being in communication with the second drain outlet and forming a tailwater drain outlet;

[0009] The algae screen structure includes an attachment plate detachably arranged on the inner wall of the second placement box and algae attached to the attachment plate, and the second placement box is detachably connected to the first placement box and the third placement box respectively.

[0010] The application of this application has the following beneficial effects: the tail water can be preliminarily filtered through the physical filtration module, and the particulate impurities in the tail water can be filtered and intercepted to prevent impurities such as fish food, sand, scales, and aquatic plants from flowing into the algae purification module and the fungus purification module. The algae purification module can use the algae screen structure to adsorb and degrade pollutants in the tail water (mainly pollutants rich in inorganic nitrogen and phosphorus elements). The fungus purification module can use the live rock structure to cultivate aerobic bacteria and anaerobic bacteria at the same time, and through the nitrification and denitrification processes, convert ammonia nitrogen into nitrate and nitrite, thereby reducing the harmful ammonia nitrogen content in the water body. The nitrates and nitrites can be adsorbed and degraded by the algae screen structure in the algae purification module. The physical filtration module, the algae purification module and the fungus purification module are linked to form an ecological purification treatment system capable of treating tail water.

[0011] At the same time, since the attachment plate is detachably arranged in the second placement box, and the second placement box is detachably connected to the first placement box and the third placement box, when the algae grow to a certain extent, the attachment plate can be conveniently removed for cleaning, thereby preventing a large amount of algae from flowing into the aquaculture water.

[0012] Optionally, the attachment plate includes a placement plate detachably arranged on the inner wall of the second placement box and an attachment base fitted on the placement plate, the algae are attached to the attachment base, and the head and tail ends of the attachment plate are respectively connected to the first drain outlet and the third placement box to guide the tail water to be treated to flow through the attachment plate.

[0013] Optionally, the algae are lower algae, and the attachment base is cotton fiber with a set thickness, and the set thickness is configured to enable a portion of the attachment base to be located outside the tail water to be treated and another portion of the attachment base to be immersed in the tail water to be treated.

[0014] Optionally, the algae purification module also includes a light source arranged on the inner wall of the second placement box, the light source is used to illuminate the algae, and a first shielding structure is provided between the first placement box and the second placement box, and a second shielding structure is provided between the second placement box and the third placement box, and the first shielding structure and the second shielding structure are both used to limit light from irradiating to the outside of the second placement box.

[0015] Optionally, the second placement box includes a second frame with a concave cross-section, the second frame includes a first vertical plate and a second vertical plate and a third vertical plate respectively arranged on both sides of the first vertical plate; the first placement box includes a first bottom plate, a first frame surrounded by the first bottom plate and a first cover plate covering the first frame, and a fourth vertical plate is extended from the first frame, the fourth vertical plate is arranged opposite to the first vertical plate and is located between the second vertical plate and the third vertical plate; the first shielding structure includes a first bottom plate and a fourth vertical plate, and the second shielding structure is an attachment plate.

[0016] Optionally, the inner wall of the second vertical plate is provided with a first connecting groove for matching with the attachment plate, and the inner wall of the third vertical plate is provided with a second connecting groove for matching with the attachment plate, the first connecting groove extends to the end of the second vertical plate and forms a first insertion port, and the second connecting groove extends to the end of the third vertical plate and forms a second insertion port; the algae purification module also includes a limiting structure adapted to the first insertion port and the second insertion port, the attachment plate is inserted into the first connecting groove and the second connecting groove from the first insertion port and the second insertion port, and the limiting structure is provided at the first insertion port and the second insertion port and limits the attachment plate to the first connecting groove and the second connecting groove.

[0017] Optionally, there are multiple attachment plates, and the multiple attachment plates are arranged to intersect at a set angle and are connected in sequence to guide the tail water to be treated to flow through the attachment plates in sequence; along the top-to-bottom direction, the upper end of the first attachment plate is located directly below the first drain outlet, and the lower end of the last attachment plate is spaced from the inner wall of the second placement box to form the second drain outlet; the lower end of the upper attachment plate of the two adjacent attachment plates is provided with a drainage hole, and the drainage hole includes a serrated opening and a cross-shaped opening formed at the end of the attachment plate.

[0018] Optionally, the live rock structure includes an outer box body and an inner box body arranged in the outer box body, the inner wall of the outer box body cooperates with the outer surface of the inner box body to form a first chamber, and a second chamber is formed inside the inner box body. The outer box body is provided with a first water inlet and outlet hole for connecting the first chamber with the outside, and the inner box body is provided with a second water inlet and outlet hole for connecting the first chamber with the second chamber, and the aperture of the first water inlet and outlet hole is larger than the aperture of the second water inlet and outlet hole; the live rock structure also includes a first filler arranged in the first chamber and a second filler arranged in the second chamber, both the first filler and the second filler have pores, and the average pores of the first filler are larger than the average pores of the second filler; the first filler includes volcanic rock and / or bacterial house particles; the second filler includes biochemical cotton.

[0019] Optionally, the third placement box includes a third bottom plate and a third frame surrounded by the third bottom plate, the third bottom plate and the third frame cooperate to form a storage space, the third placement box also includes a first partition arranged longitudinally and a second partition arranged horizontally, the first partition and the second partition cooperate to separate the storage space into a storage cavity and a drainage channel for the flow of tail water to be treated, and the live stone structure is arranged in the storage cavity; the drainage channel has a first water inlet port located at the upper end of the first partition and a second water inlet port located between the lower end of the first partition and the second partition, the first water inlet port is located directly below the second drain outlet, and the height positions of the first water inlet port, the tail water drain outlet and the second water inlet port decrease successively.

[0020] Optionally, the first placement box has a first plug-in plate formed at its bottom, the second placement box has a first slot formed at its top and a second plug-in plate formed at its bottom, the third placement box has a second slot formed at its top, the first plug-in plate is plugged into the first slot, and the second plug-in plate is plugged into the second slot; the first plug-in plate is configured to be able to plug into the second slot, and the third placement box can be connected to the first drain outlet after the first plug-in plate is inserted into the second slot.

[0021] These features and advantages of this application will be disclosed in detail in the following detailed description and accompanying drawings. The best embodiments or means of this application will be fully illustrated in conjunction with the accompanying drawings, but this does not limit the technical solutions of this application. Furthermore, although there may be multiple features, elements, and components in each of the following text and accompanying drawings, different symbols or numbers may be used for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present application will be further described below with reference to the accompanying drawings:

[0023] Figure 1 A schematic structural diagram of a tailwater treatment device provided in an embodiment of the present application;

[0024] Figure 2 This is an exploded view of the tailwater treatment device;

[0025] Figure 3 This is an exploded view of the tailwater treatment device from another perspective;

[0026] Figure 4 This is a structural diagram of the algae purification module;

[0027] Figure 5 This is an exploded view of the algae purification module;

[0028] Figure 6 This is a schematic diagram of the structure of the third placement box in the fungus purification module;

[0029] Figure 7 This is a schematic diagram of the live rock structure in the fungus purification module;

[0030] Figure 8 This is a schematic diagram of the interior of the living rock structure;

[0031] Figure 9 A schematic diagram of phosphate content control experiment data in a tail water treatment control experiment using the tail water treatment device provided in this application;

[0032] Figure 10 A schematic diagram of total phosphorus content control experiment data in a tail water treatment control experiment using the tail water treatment device provided in this application;

[0033] Figure 11 A schematic diagram of ammonia nitrogen content control experiment data in a tail water treatment control experiment using the tail water treatment device provided in this application;

[0034] Figure 12 This is a schematic diagram of the total nitrogen content control experiment data in the tail water treatment control experiment using the tail water treatment device provided in this application.

[0035] Among them, 1. First placement box; 10. First bottom plate; 100. First drain outlet; 11. First enclosure; 110. Tailwater inlet; 12. First cover plate; 13. Fourth vertical plate; 14. First plug-in plate; 2. Second placement box; 20. First vertical plate; 200. Second drain outlet; 21. Second vertical plate; 210. First connecting groove; 22. Third vertical plate; 220. Second connecting groove; 23. Light source mounting groove; 24. Second plug-in plate; 25. First slot; 3. Attachment plate; 30. Placement plate; 300. Drain hole; 31. , water baffle; 4, third placement box; 40, third bottom plate; 41, third frame; 42, first partition; 420, first water inlet port; 421, second water inlet port; 43, second partition; 430, positioning hole; 44, tailwater outlet; 45, second slot; 46, guide plate; 5, outer box body; 50, outer shell; 51, outer cover; 52, first chamber; 53, first water inlet and outlet; 6, inner box body; 60, inner shell; 61, inner cover; 62, second chamber; 63, second water inlet and outlet; 7, connecting frame. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described in the embodiments are intended to be used to explain the present application and are not to be construed as limiting the present application.

[0037] References in this specification to "one embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment disclosed herein. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0038] As previously mentioned, when using algae-bacteria symbiosis to treat aquaculture tailwater in related technologies, algae can easily re-enter the aquaculture area with the continuously circulating water, thereby deteriorating water quality, reducing oxygen levels, and clogging fish respiratory organs. Aquarium tanks and aquariums often produce a yellow-green contaminant on their walls after a period of use. This yellow-green contaminant is the result of excessive algae growth. The inventors have discovered that the algae cultivation environments used in related technologies contain certain design issues, leading to this phenomenon.

[0039] To this end, this embodiment provides a tail water treatment device for purifying aquaculture water, such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in , the tailwater treatment device includes a physical filtration module, an algae purification module and a fungus purification module. Among them, the physical filtration module includes a first placement box 1 and a filtration structure arranged in the first placement box 1, and the first placement box 1 is formed with a tailwater inlet 110 and a first drain 100 lower than the tailwater inlet 110. The physical filtration module can first perform a preliminary filtration on the tailwater, and can filter and intercept particulate impurities in the tailwater, preventing impurities such as bait, excrement, scales, and aquatic plants from flowing into the algae purification module and the fungus purification module. The filtration structure can be a filter mesh, filter cotton, etc. The tailwater purification device in the prior art is generally also provided with such a filtration structure, which will not be described here.

[0040] The algae purification module includes a second placement box 2 and an algae screen structure disposed within the second placement box 2. The second placement box 2 is connected to the first drain outlet 100 and forms a second drain outlet 200. The algae purification module can use the algae screen structure to adsorb and degrade pollutants in the tailwater (primarily pollutants rich in inorganic nitrogen and phosphorus elements). The fungus purification module includes a third placement box 4 and a live rock structure disposed within the third placement box 4. The live rock structure is configured to cultivate aerobic and anaerobic bacteria. The third placement box 4 is connected to the second drain outlet 200 and forms a tailwater drain outlet 44. The fungus purification module can use the live rock structure to simultaneously cultivate aerobic and anaerobic bacteria. Through the nitrification and denitrification processes, ammonia nitrogen is converted into nitrates and nitrites, reducing the harmful ammonia nitrogen content in the water. Nitrates and nitrites can, in turn, be adsorbed and degraded by the algae screen structure within the algae purification module.

[0041] Therefore, the tailwater treatment device provided in this embodiment can form an ecological purification system capable of treating tailwater through the linkage of the physical filtration module, the algae purification module and the fungus purification module.

[0042] The algae screen structure in this embodiment includes an attachment plate 3 detachably arranged on the inner wall of the second placement box 2 and algae attached to the attachment plate 3 for water pollutant treatment. The second placement box 2 is detachably connected to the first placement box 1 and the third placement box 4, respectively. Thus, when the algae grow to a certain extent, the attachment plate 3 can be conveniently removed for cleaning, thereby removing harmful substances in the water body and preventing algae from entering the aquaculture water body. For ease of understanding, the tailwater treatment device provided in this embodiment can be applied to the aquaculture water tank in the aquarium. The aquaculture water body is contained in the aquaculture water tank. The tailwater inlet 110 and the tailwater outlet 44 in this embodiment are both connected to the aquaculture water tank.

[0043] Further, combined Figure 5As shown in , the attachment plate 3 in this embodiment includes a placement plate 30 detachably arranged on the inner wall of the second placement box 2 and an attachment base fitted on the placement plate 30. Algae are attached to the attachment base, and the attachment plate 3 is detachably connected to the inner wall of the second placement box 2 through the placement plate 30. The head and tail ends of the attachment plate 3 are respectively connected to the first drain port 100 and the third placement box 4 to guide the tail water to be treated to flow through the attachment plate 3. It should be noted that the "connection" described in this embodiment does not necessarily mean a sealed connection between the two structures. For example, in this embodiment, the upper end of the attachment plate 3 is set directly below the first drain port 100, so that the tail water to be treated can drip from the first drain port 100 and flow to the upper end of the attachment plate 3.

[0044] The algae described in this embodiment need to be cultured in advance. Specifically, a 0.5 m x 0.5 m square frame is constructed using polyvinyl chloride (PVC) tubing. Gauze with a 2 mm pore size is selected as the attachment substrate based on the hydrodynamic characteristics and nutrient exchange rate. The gauze is wrapped around the frame in three layers, and the algae are then attached to the gauze. After a certain period of time, the algae grows to a sufficient size for use. The gauze is then removed (or, in other words, the PVC tubing is removed from the gauze), and the gauze with the algae attached is then placed on the placement plate 30. Cultivating the algae on the gauze to a certain height increases the algae attachment area and enhances the stability of the entire algae screen structure. Compared to prior art algae placement schemes (which directly place algae on the surface or within the aquaculture water body), this method of attaching the algae to the gauze in this embodiment allows the algae to be more stably retained within the second placement box 2, significantly reducing the amount of algae that escapes the second placement box 2. It is easy to understand that the edge of the gauze can be fixed to the placement plate 30 by means of structures such as pressure strips, card plates, screws, etc., so that the gauze can be fitted and positioned on the placement plate 30.

[0045] Furthermore, the inventors' research has revealed that, compared to higher algae species such as filamentous algae commonly used in prior art bacterial-algal symbiotic schemes, lower algae exhibit a robust ability to absorb nutrients, particularly nitrate and phosphate, effectively reducing nitrogen and phosphorus loads in water bodies. In other words, lower algae possess a more pronounced function in regulating water environmental homeostasis. To this end, the algae used in this embodiment are lower algae, specifically those found in the intertidal zone. To simulate the intertidal environment suitable for the growth of these lower algae, the thickness of the attachment substrate in this embodiment is configured to a predetermined thickness. This predetermined thickness allows a portion of the attachment substrate to be located outside the tailwater to be treated, while another portion remains immersed within the tailwater. The principle is explained as follows: the tail water to be treated enters the second placement box 2 from the first drain port 100, and flows along the placement plate 30. The water depth of the tail water to be treated when flowing through the placement plate 30 can be calculated in advance based on the flow rate of the tail water to be treated. The thickness of the attachment base is designed to be slightly larger than the above-mentioned water depth, so that the upper part of the attachment base along the thickness direction is located outside the tail water to be treated (exposed to the air), while the lower part of the attachment base along the thickness direction can be immersed in the tail water to be treated. The above design can provide a more suitable growth environment for lower algae. It is easy to understand that the set thickness is pre-designed according to the tail water flow rate. In addition, the attachment base in this embodiment is gauze, and in other optional embodiments, it can also be other cotton fiber materials.

[0046] The algae purification module in this embodiment further includes a light source (not shown) disposed on the inner wall of the second placement box 2. The light source is used to illuminate the algae. A first shielding structure is disposed between the first and second placement boxes 1 and 2, and a second shielding structure is disposed between the second and third placement boxes 4. Both the first and second shielding structures are used to limit light from reaching the exterior of the second placement box 2. The provision of the light source provides a more suitable growth environment for the algae. More importantly, unlike the related art approach of "simultaneously arranging algae and a light source for irradiating the algae within the aquaculture tank," this embodiment positions the algae within the second placement box 2 via an attachment plate 3. Furthermore, a first shielding structure is disposed between the first and second placement boxes 1 and 2, and a second shielding structure is disposed between the second and third placement boxes 4. As a result, the majority of light emitted by the light source is directed to the interior of the second placement box 2 (a very small portion of light will enter the first and third placement boxes 1 and 4 through the first and second drainage outlets 100 and 200, respectively). Through the above-mentioned structural setting, an environment suitable for algae growth can be created separately in the second placement box 2. For a small amount of algae that flows into the first placement box 1 and the third placement box 4 with the circulating water, it is difficult to grow quickly due to the lack of light, thereby further reducing the probability of large-scale growth of algae outside the second placement box 2.

[0047] It should be noted that these intertidal lower algae exhibit "competitive inhibition" characteristics. Specifically, their growth can inhibit the growth of other non-species algae. In this embodiment, a light source and an attachment substrate that simulates the intertidal zone's growth environment are specifically provided within the second storage box 2. This creates a growth environment for the lower algae that far surpasses that found elsewhere. Therefore, once the lower algae begin to grow on the attachment substrate, even if a small amount of algae circulates outside the second storage box 2, they are unable to grow rapidly.

[0048] Specifically in this embodiment, combined with Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown in , the second placement box 2 in this embodiment includes a second frame with a concave cross-section, and the second frame includes a first vertical plate 20 and a second vertical plate 21 and a third vertical plate 22 respectively arranged on both sides of the first vertical plate 20. The first placement box 1 includes a first base plate 10, a first frame 11 surrounding the first base plate 10, and a first cover plate 12 covering the first frame 11, and a fourth vertical plate 13 is extended from the first frame 11, and the fourth vertical plate 13 is arranged opposite to the first vertical plate 20 and is located between the second vertical plate 21 and the third vertical plate 22. The aforementioned first shielding structure includes the first base plate 10 and the fourth vertical plate 13, and the second shielding structure is the attachment plate 3. Specifically, in this embodiment, there are two attachment plates 3, and the second shielding structure is the attachment plate 3 arranged at the bottom, that is, the attachment plate 3 arranged at the bottom can play a role in limiting the light from entering the third placement box 4.

[0049] like Figure 5 As shown in , the inner wall of the second vertical plate 21 in this embodiment is provided with a first connecting groove 210 for matching with the attachment plate 3, and the inner wall of the third vertical plate 22 is provided with a second connecting groove 220 for matching with the attachment plate 3. The first connecting groove 210 extends to the end of the second vertical plate 21 and forms a first insertion port, and the second connecting groove 220 extends to the end of the third vertical plate 22 and forms a second insertion port. The algae purification module also includes a limiting structure that is compatible with the first insertion port and the second insertion port. The attachment plate 3 is inserted into the first connecting groove 210 and the second connecting groove 220 from the first insertion port and the second insertion port. The limiting structure is provided at the first insertion port and the second insertion port and confines the attachment plate 3 to the first connecting groove 210 and the second connecting groove 220. Combined Figure 1 and Figure 2 As shown in , specifically in this embodiment, the limiting structure is a portion of the fourth vertical plate 13 that is opposite to the first insertion port and the second insertion port.

[0050] The above-mentioned structural design can further facilitate the disassembly, assembly and replacement of the attachment plate 3. Specifically, when the attachment plate 3 needs to be replaced and cleaned, the first placement box 1 can be removed from the second placement box 2 first. After losing the restriction of the limiting structure on the fourth vertical plate 13, the attachment plate 3 can be easily slid out. After scraping and cleaning the algae on the attachment plate 3, the attachment plate 3 is re-inserted into the first connecting groove 210 and the second connecting groove 220 through the first insertion port and the second insertion port, and then the first placement box 1 is installed on the second placement box 2. The fourth vertical plate 13 can be used to close the first insertion port and the second insertion port, thereby preventing the attachment plate 3 from falling out.

[0051] In this embodiment, the first placement box 1 has a first inserting plate 14 formed on its bottom, the second placement box 2 has a first slot 25 formed on its top and a second inserting plate 24 formed on its bottom, and the third placement box 4 has a second slot 45 formed on its top. The first inserting plate 14 plugs into the first slot 25, and the second inserting plate 24 plugs into the second slot 45. This structural design allows for convenient assembly and disassembly of the first placement box 1, the second placement box 2, and the third placement box 4.

[0052] It is easy to understand that the above-mentioned replacement operation process requires first turning off the power to the water pump used to drive the circulation of the tail water to be treated, and then performing the disassembly operation of the first placement box 1. In an optional embodiment, the following structural design can be further performed: the first plug plate 14 is configured to be able to be plugged into and matched with the second slot 45, and the third placement box 4 can be connected to the first drain outlet 100 after the first plug plate 14 is inserted into the second slot 45. Specifically, the sizes of the first plug plate 14 and the second slot 45 are adapted and designed. When it is necessary to replace and clean the attachment plate 3, the first placement box 1 can be directly lifted up without turning off the power to the water pump, and then the second placement box 2 can be lifted up and taken out, and then the first placement box 1 can be installed on the third placement box 4 by inserting the first plug plate 14 into the second slot 45. At this time, the tail water to be treated can circulate between the first placement box 1 and the third placement box 4 and the aquaculture water tank. After completing the disassembly, cleaning and reinstallation of the attachment plate 3, the second placement box 2 can be installed between the first placement box 1 and the third placement box 4. As Figure 2 As shown in , it is easy to understand that the fourth vertical plate 13 may interfere with the third placement box 4 during the process of installing the first placement box 1 to the third placement box 4. Therefore, in an optional embodiment, the fourth vertical plate 13 can be designed to be detachably mounted on the first surrounding frame 11 by snaps or screws, and the fourth vertical plate 13 can be temporarily removed.

[0053] The attachment plate 3 described in this embodiment can be designed as one or multiple pieces. When multiple attachment plates 3 are provided, the multiple attachment plates 3 are arranged to intersect at a set angle and are connected in sequence to guide the tail water to be treated to flow through the attachment plates 3 in sequence. At the same time, in the direction from top to bottom, the upper end of the first attachment plate 3 is located directly below the first drain port 100, and the lower end of the last attachment plate 3 is spaced from the inner wall of the second placement box 2 to form the second drain port 200. Figure 3 and Figure 4 As shown in , this embodiment is described by taking the arrangement of two attachment plates 3 as an example. By plugging and assembling the placement plate 30 with the aforementioned first connection groove 210 and second connection groove 220, the frame can be fixed to the placement plate 30 by means of snap connection, screw connection, or bonding. In this embodiment, a light source mounting groove 23 is provided on the inner wall of the second placement box 2. The light source includes a light bar, which is fixedly mounted in the light source mounting groove 23. By designing multiple attachment plates 3 to be arranged at an angle, the algae arrangement area in the limited space can be increased while the internal space of the second placement box 2 remains unchanged, thereby improving the purification effect of the tail water.

[0054] In this embodiment, a drainage hole 300 is provided at the lower end of the upper attachment plate 3 of the two adjacent attachment plates 3. The drainage hole 300 includes a serrated opening and a cross-shaped opening formed at the end of the attachment plate 3. In some optional embodiments, water retaining plates 31 may be provided on both sides of the placement plate 30 to guide the tailwater to be treated to flow along the placement plate 30.

[0055] Combine Figure 6 、 Figure 7 and Figure 8As shown in , the living rock structure in this embodiment includes an outer box body 5 and an inner box body 6 disposed within the outer box body 5. Specifically, the outer box body 5 includes an outer shell 50 and an outer cover plate 51 disposed on the outer shell 50, and the inner box body 6 includes an inner shell 60 and an inner cover plate 61 disposed on the inner shell 60. The inner wall of the outer box body 5 cooperates with the outer surface of the inner box body 6 to form a first chamber 52, and a second chamber 62 is formed within the inner box body 6. The outer box body 5 is provided with a first water inlet and outlet hole 53 for connecting the first chamber 52 with the outside, and the inner box body 6 is provided with a second water inlet and outlet hole 63 for connecting the first chamber 52 with the second chamber 62. The aperture of the first water inlet and outlet hole 53 is larger than the aperture of the second water inlet and outlet hole 63. The living rock structure also includes a first filler disposed within the first chamber 52 and a second filler disposed within the second chamber 62. Both the first filler and the second filler have pores, and the average pore size of the first filler is larger than the average pore size of the second filler. It is easy to understand that during the manufacturing process of the above-mentioned first filler and second filler, it is impossible to make the internal pore size of a single first filler or a single second filler exactly the same. Therefore, the average pore refers to the design nominal size of the selected first filler or second filler.

[0056] Through the above-mentioned structural design, an oxygen-rich environment can be formed in the first chamber 52, and a hypoxic environment can be formed in the second chamber 62. The oxygen-rich environment is conducive to the growth and reproduction of aerobic bacteria, while the hypoxic environment is conducive to the growth and reproduction of anaerobic bacteria. Specifically, in this embodiment, 3D printing technology is used to construct two square boxes of different sizes made of polylactic acid. The larger square box serves as the outer box body 5, and the smaller square box serves as the inner box body 6. Based on experimental data, the aperture of the first water inlet and outlet holes 53 can be selectively designed to be 1 mm, and the aperture of the second water inlet and outlet holes 63 can be 0.5 mm. The first filler is volcanic rock and bacterial house particles, and the second filler is biochemical cotton. By filling the second chamber 62 with biochemical cotton, anaerobic bacteria are attached and cultured, while filling the first chamber 52 with volcanic rock and bacterial house particles is attached and cultured for aerobic bacteria. The treated tailwater enters the active rock structure through the first inlet and outlet holes 53. After passing through the volcanic rock and bacterial house particles, the flow rate of the treated tailwater gradually slows, and it eventually seeps into the bio-cotton in the second chamber 62, creating both anaerobic and oxygen-rich environments, thus providing a favorable environment for the growth of aerobic and anaerobic bacteria. In practice, the oxygen concentration in the hypoxic zone is generally controlled below 1.7 mg / L, and the oxygen concentration in the oxygen-rich zone is controlled below 9 mg / L.

[0057] It should be noted that the pores of the first filler include both the spaces between adjacent volcanic rock or bacterial house particles due to their irregular shapes, as well as the penetrating pores formed within individual volcanic rock or bacterial house particles. As tailwater flows into the living rock structure, it can flow through the spaces between adjacent volcanic rock or bacterial house particles, as well as through the internal pores of individual volcanic rock or bacterial house particles. It is easy to understand that the volcanic rock or bacterial house particles are distributed with honeycomb-like pores, which allow fungi to attach and grow. The pores of the second filler refer to the pores formed within the bio-cotton, alternating between sparse and dense.

[0058] The live rock structure provides a suitable growth environment for aerobic and anaerobic bacteria. In the nitrogen cycle of water, aerobic bacteria use oxygen to decompose organic matter (such as fish excrement and food waste). They then convert toxic ammonia into nitrite through nitrification, which is then further oxidized to nitrate. Meanwhile, anaerobic bacteria, in a low-oxygen environment, reduce nitrate to nitrogen gas through denitrification, effectively treating nutrients and pollutants in the water.

[0059] In the prior art, anaerobic environments are generally created by using silt at the bottom of a water body. This approach cannot control the size of the anaerobic environment, that is, the size of the environment suitable for the growth of anaerobic bacteria. However, the live rock structure in this embodiment can consider the appropriate ratio of aerobic and anaerobic bacteria based on factors such as the type of fish being farmed and the size of the aquaculture tank. Accordingly, the ratio of the first chamber 52 and the second chamber 62 can be adjusted, thereby providing an appropriately sized environment suitable for the growth of aerobic and anaerobic bacteria. In addition, once the anaerobic environment created by silt in the prior art is generated, it cannot be transplanted elsewhere, resulting in a very slow establishment of an ecological purification system for the symbiotic bacteria and algae. The live rock structure in this embodiment actively creates low-oxygen and high-oxygen zones through the first and second boxes. The live rock structure can be moved. Thus, after the anaerobic and high-oxygen environments, as well as anaerobic and aerobic bacteria, are previously cultivated using the live rock structure, they can be directly introduced into the tailwater treatment system as needed, thereby quickly cooperating with algae in the tailwater treatment system for ecological purification, reducing waiting time.

[0060] In order to make the tail water to be treated flowing from the second placement box 2 into the third placement box 4 better infiltrate the active stone structure, the structure of the third placement box 4 is designed in this embodiment. Specifically, Figure 6As shown in , the third placement box 4 in this embodiment includes a third base plate 40 and a third frame 41 surrounding the third base plate 40. The third base plate 40 and the third frame 41 cooperate to form a storage space. The third placement box 4 also includes a first partition plate 42 arranged longitudinally and a second partition plate 43 arranged horizontally. The first partition plate 42 and the second partition plate 43 cooperate to divide the storage space into a storage chamber and a drainage channel for the flow of the tail water to be treated. The live rock structure is arranged in the storage chamber. Specifically, a positioning hole 430 is opened on the second partition plate 43. The size and shape of the positioning hole 430 are compatible with the size and shape of the outer wall of the live rock structure. During assembly, the live rock structure can be directly inserted into the positioning hole 430 to fix the live rock structure in the storage chamber. At the same time, the drainage channel has a first water inlet port 420 located at the upper end of the first partition plate 42 and a second water inlet port 421 located at the lower end of the first partition plate 42. Specifically, the first baffle 42 is spaced apart from one side of the third enclosure 41 to form the drainage channel therebetween. The space between the upper end of the first baffle 42 and the side of the third enclosure 41 serves as the first water inlet port 420, and the space between the lower end of the first baffle 42 and the second baffle 43 serves as the second water inlet port 421. The first water inlet port 420, tailwater outlet 44, and second water inlet port 421 are positioned in descending order.

[0061] The above-described structural design allows the treated tailwater to first flow directly into the bottom of the third placement box 4 through the first water inlet port 420, then enter the accommodating chamber through the second water inlet port 421. The treated tailwater then gradually rises from a low point to a high point, effectively infiltrating the interior of the live rock structure. When the treated tailwater reaches the tailwater outlet 44, it automatically flows out of the outlet 44 into the aquaculture tank. By overflowing the tailwater into the installation chamber, the noise of the water flow is reduced and the flow is smoother, which is beneficial for the growth of microorganisms on the live rock. This also reduces the direct impact of the tailwater flow on the artificial live rock, preventing bacteria and microorganisms on the surface of the artificial live rock from being washed away by excessive water flow. Furthermore, this ensures that the tailwater flow that contacts the artificial live rock is a flowing stream, which increases the dissolved oxygen in the water and promotes the growth of aerobic bacteria on the artificial live rock. Furthermore, the above-described overflow design prevents the water flow from directly impacting the artificial live rock, reducing the accumulation of sediment on the live rock and keeping it clean and effective.

[0062] The tail water outlet 44 is provided on a side wall of the third enclosure 41 . Optionally, an arc-shaped guide plate 46 may be provided on the side wall to guide the treated tail water to flow into the aquaculture water tank through the guide plate 46 .

[0063] The tail water treatment device provided in this embodiment further includes a connecting frame 7 fixedly arranged on the outer wall of the third placement box 4 , and the tail water treatment device is installed on the aquaculture water tank through the connecting frame 7 .

[0064] The tailwater treatment device provided in this embodiment can be applied to an aquaculture water tank, with the tailwater inlet 110 and the tailwater outlet 44 both being connected to the aquaculture water tank. Specifically, the tailwater treatment device can be mounted on the aquaculture water tank via the connecting frame 7. The tailwater to be treated in the aquaculture water tank is pumped by a water pump through the tailwater inlet 110 into the first storage box 1. After being filtered and purified by the tailwater treatment device, the tailwater is then discharged into the aquaculture water tank through the tailwater outlet 44.

[0065] The tailwater treatment device provided in this embodiment uses a physical filtration module to filter suspended particles and impurities from the treated tailwater, preventing clogging of the subsequent algae purification module and fungus purification module due to excessive particulate matter. This effectively reduces the purification load of the entire device and extends the service life of the algae purification module and fungus purification module. The algae purification module cultivates lower algae for biological purification of the treated tailwater. These algae can efficiently absorb excess nutrients in the treated tailwater, preventing eutrophication. Furthermore, the algae purification module is removable, facilitating regular cleaning and maintaining the algae growth environment, thereby ensuring long-term stable operation of the system and sustained tailwater purification. The fungus purification module cultivates aerobic and anaerobic bacteria attached to a live rock structure. The synergistic action of these two types of bacteria effectively decomposes organic matter, ammonia nitrogen, and other harmful substances in the water, significantly reducing the concentration of water pollutants. By subjecting the treated tailwater to a three-layer filtration and purification process, the physical filtration module, algae purification module, and fungus purification module effectively remove organic matter from the treated tailwater and absorb and decompose water pollutants, thereby achieving in-situ water purification.

[0066] like Figures 9 to 12 As shown in the Figure , a comparative experiment was conducted using the tailwater treatment device provided in this embodiment. Using aquaculture tanks of the same volume, water volume, and fish population, the control group received no tailwater treatment, while the experimental group received treatment using the tailwater treatment device provided in this embodiment. The experiment lasted four days, with the four major indicators of phosphate, total phosphorus, ammonia nitrogen, and total nitrogen in the tailwater tested each day. The temperature was maintained at 18°C, the salinity at 27-28 psu, and the photoperiod was 12L:12D (7:00 AM - 7:00 PM). The concentrations of phosphate, total phosphorus, ammonia nitrogen, and total nitrogen before the experiment were 0.031 mg / L, 0.06 mg / L, 0.236 mg / L, and 0.395 mg / L, respectively.

[0067] like Figure 9 and Figure 10As shown in the figure, the phosphate and total phosphorus contents of the control group and the experimental group showed a certain fluctuation. After four days of experiment, the phosphate and total phosphorus contents of the control group increased, while those of the experimental group showed a downward trend. On the fourth day of the experiment, the phosphate and total phosphorus contents of the experimental group were lower than those of the control group. Figure 11 As shown in the figure, the ammonia nitrogen content in both the control group and the experimental group showed a trend of first increasing and then decreasing. On the second day of the experiment, the ammonia nitrogen content in the experimental group was significantly lower than that in the control group. On the fourth day of the experiment, the difference between the experimental data of the two groups further expanded. Figure 12 As shown in the figure, the total nitrogen content of the control group remained at 0.39 mg / L during the experiment, while the total nitrogen content of the experimental group showed a downward trend on the second day and was significantly lower than that of the control group on the fourth day.

[0068] Through the above experimental comparison, it can be seen that the tail water treatment device has obvious purification and removal effect on nitrogen and phosphorus nutrients.

[0069] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present application are included within the scope of the claims.

Claims

1. A tail water treatment device for purifying aquaculture water, characterized in that: The tailwater treatment device comprises: A physical filtration module, comprising a first placement box (1) and a filtration structure arranged in the first placement box (1), wherein the first placement box (1) is formed with a tail water inlet (110) and a first drain outlet (100) lower than the tail water inlet (110); An algae purification module comprises a second placement box (2) and an algae screen structure arranged in the second placement box (2), wherein the second placement box (2) is communicated with the first drain port (100) and forms a second drain port (200); and A fungus purification module, comprising a third placement box (4) and a live stone structure disposed in the third placement box (4), wherein the live stone structure is configured to be able to cultivate aerobic bacteria and anaerobic bacteria, and the third placement box (4) is in communication with the second drain port (200) and forms a tailwater drain port (44); The algae screen structure comprises an attachment plate (3) detachably arranged on the inner wall of the second placement box (2) and algae attached to the attachment plate (3), and the second placement box (2) is detachably connected to the first placement box (1) and the third placement box (4). The first placement box (1) has a first plug-in plate (14) formed at the bottom, the second placement box (2) has a first slot (25) formed at the top and a second plug-in plate (24) formed at the bottom, the third placement box (4) has a second slot (45) formed at the top, the first plug-in plate (14) is plugged into and matched with the first slot (25), and the second plug-in plate (24) is plugged into and matched with the second slot (45); The first plug plate (14) is configured to be pluggable with the second slot (45), and the third placement box (4) can be connected to the first drain port (100) after the first plug plate (14) is inserted into the second slot (45); The living rock structure comprises an outer box body (5) and an inner box body (6) arranged in the outer box body (5); the inner wall of the outer box body (5) cooperates with the outer surface of the inner box body (6) to form a first chamber (52); a second chamber (62) is formed inside the inner box body (6); the outer box body (5) is provided with a first water inlet and outlet hole (53) for connecting the first chamber (52) with the outside; the inner box body (6) is provided with a second water inlet and outlet hole (63) for connecting the first chamber (52) with the second chamber (62); the aperture of the first water inlet and outlet hole (53) is larger than the aperture of the second water inlet and outlet hole (63); The living rock structure further comprises a first filler disposed in the first chamber (52) and a second filler disposed in the second chamber (62), wherein both the first filler and the second filler have pores, and the average pores of the first filler are greater than the average pores of the second filler.

2. The tailwater treatment device according to claim 1, characterized in that: The attachment plate (3) comprises a placement plate (30) detachably arranged on the inner wall of the second placement box (2) and an attachment base fitted on the placement plate (30), the algae being attached to the attachment base, and the head and tail ends of the attachment plate (3) being respectively connected to the first drain port (100) and the third placement box (4) to guide the tail water to be treated to flow through the attachment plate (3).

3. The tailwater treatment device according to claim 2, characterized in that: The algae are lower algae, and the attachment base is cotton fiber with a set thickness. The set thickness is configured so that a portion of the attachment base is located outside the tail water to be treated and another portion of the attachment base is immersed in the tail water to be treated.

4. The tailwater treatment device according to claim 2, characterized in that: The algae purification module further comprises a light source arranged on the inner wall of the second placement box (2), the light source being used to illuminate the algae, and a first shielding structure being provided between the first placement box (1) and the second placement box (2), and a second shielding structure being provided between the second placement box (2) and the third placement box (4), the first shielding structure and the second shielding structure both being used to limit light from irradiating outside the second placement box (2).

5. The tailwater treatment device according to claim 4, characterized in that: The second placement box (2) comprises a second surrounding frame with a concave cross section, the second surrounding frame comprising a first vertical plate (20) and a second vertical plate (21) and a third vertical plate (22) respectively arranged on both sides of the first vertical plate (20); The first placement box (1) comprises a first bottom plate (10), a first frame (11) surrounding the first bottom plate (10), and a first cover plate (12) covering the first frame (11), and a fourth vertical plate (13) extending from the first frame (11), the fourth vertical plate (13) being arranged opposite to the first vertical plate (20) and located between the second vertical plate (21) and the third vertical plate (22); The first shielding structure comprises a first bottom plate (10) and a fourth vertical plate (13), and the second shielding structure is an attachment plate (3).

6. The tailwater treatment device according to claim 5, characterized in that: The inner wall of the second vertical plate (21) is provided with a first connecting groove (210) for matching with the attachment plate (3), and the inner wall of the third vertical plate (22) is provided with a second connecting groove (220) for matching with the attachment plate (3), the first connecting groove (210) extends to the end of the second vertical plate (21) and forms a first insertion port, and the second connecting groove (220) extends to the end of the third vertical plate (22) and forms a second insertion port; The algae purification module further comprises a limiting structure adapted to the first insertion port and the second insertion port, the attachment plate (3) is inserted into the first connection groove (210) and the second connection groove (220) through the first insertion port and the second insertion port, and the limiting structure is arranged at the first insertion port and the second insertion port and limits the attachment plate (3) within the first connection groove (210) and the second connection groove (220).

7. The tailwater treatment device according to claim 2, characterized in that: The attachment plates (3) are provided in plurality, and the plurality of attachment plates (3) are arranged to intersect at a set angle and are sequentially connected to guide the tail water to be treated to flow through the attachment plates (3) in sequence; In the direction from top to bottom, the upper end of the first attachment plate (3) is located directly below the first drain outlet (100), and the lower end of the last attachment plate (3) is spaced from the inner wall of the second placement box (2) to form the second drain outlet (200); A drainage hole (300) is provided at the lower end of the upper attachment plate (3) of the two adjacent attachment plates (3), and the drainage hole (300) comprises a serrated opening and a cross-shaped opening formed at the end of the attachment plate (3).

8. The tailwater treatment device according to claim 1, wherein: The first filler includes volcanic rocks and / or bacterial house particles; the second filler includes biochemical cotton.

9. The tailwater treatment device according to claim 8, characterized in that: The third placement box (4) includes a third bottom plate (40) and a third frame (41) enclosed on four sides of the third bottom plate (40), the third bottom plate (40) and the third frame (41) cooperate to form a storage space, the third placement box (4) also includes a first partition plate (42) arranged longitudinally and a second partition plate (43) arranged horizontally, the first partition plate (42) and the second partition plate (43) cooperate to separate the storage space into a storage cavity and a drainage channel for the tail water to be treated, and the living stone structure is arranged in the storage cavity; The drainage channel comprises a first water inlet port (420) located at the upper end of the first partition (42) and a second water inlet port (421) located between the lower end of the first partition (42) and the second partition (43); the first water inlet port (420) is located directly below the second drain port (200); and the height positions of the first water inlet port (420), the tailwater drain port (44), and the second water inlet port (421) decrease in sequence.

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