Tail water treatment device for purifying aquaculture water

Abstract

The invention discloses a tail water treatment device for aquaculture water purification, and belongs to the field of sewage purification, the tail water treatment device comprises: a physical filtering module, which comprises a first placing box and a filtering structure, and the first placing box is provided with a tail water inlet and a first water outlet; the algae purification module comprises a second placement box and an algae screen structure, and the second placement box communicates with the first water outlet and forms a second water outlet; the fungus purification module comprises a third placing box and a movable stone structure, and the third placing box is communicated with the second water outlet and is provided with a tail water outlet; the algae screen structure comprises an attachment plate provided with micropores and algae arranged on the attachment plate, the attachment plate is detachably arranged on the inner wall of the second placing box, and the second placing box is detachably connected with the first placing box and the third placing box. By means of the device, the attachment plate can be conveniently taken down for cleaning operation, and therefore a large amount of algae is prevented from flowing into the culture water body.

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 tailwater 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 tailwater can be roughly divided into three categories: physical, chemical and biological. The general methods include flocculation, precipitation, filtration or adsorption, etc. In real life, different methods are mostly combined and used, and the eutrophic elements are converted or absorbed. However, the above scheme will have problems such as high energy consumption, high cost and easy to produce secondary pollutants. In recent years, the technology development based on the concept of bacteria and algae symbiosis has shown good research potential and application prospects. For example, China's public patent CN202211254594.X discloses a device and method for the coordinated treatment of aquaculture tailwater by algae and fungi. By inoculating microalgae and using the fungi formed by microorganisms in the tailwater, a bacteria-algae symbiosis can be formed. The bacteria-algae symbiosis can simultaneously reduce carbon, nitrogen and phosphorus to achieve tailwater treatment.

[0003] However, the solutions of such bacteria and algae in the related art for the coordinated treatment of tail water have the following problems in practical 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 speed of the floating algae is relatively fast, and the fast-growing algae are easy to re-enter the aquaculture water body with the circulated tail water, resulting in the deterioration of the water quality of the aquaculture water body, the reduction of the oxygen content of the water body, and the blockage of the respiratory organs of fish. At present, a physical filtering structure is generally set to prevent the 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 of the deterioration of the water quality of the aquaculture water body caused by the excessive growth of algae in the aquaculture water body, and because the algae are easy to adhere to the wall of the water tank and other places, it is difficult to remove them from the aquaculture water environment by means of salvage. 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: 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; 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 A fungus purification module, comprising a third placement box and a live stone structure disposed in the third placement box, wherein the live stone structure is configured to be able to cultivate aerobic bacteria and anaerobic bacteria, and the third placement box is communicated with the second drainage port and forms a tailwater drainage port; 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.

[0006] The application of this application has the following beneficial effects: the tail water can be initially filtered through the physical filtration module, and the particulate impurities in the tail water can be filtered and intercepted to prevent fish food, sand, scales, water plants and other impurities 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 process, ammonia nitrogen is converted into nitrates and nitrites, 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.

[0007] 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 grows to a certain extent, the attachment plate can be conveniently removed for cleaning, thereby preventing the algae from flowing into the breeding water in large quantities.

[0008] 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 port and the third placement box to guide the tail water to be treated to flow through the attachment plate.

[0009] 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 soaked in the tail water to be treated.

[0010] 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 irradiate the algae, and a first shielding structure is arranged between the first placement box and the second placement box, and a second shielding structure is arranged 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.

[0011] 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 extends 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.

[0012] 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 matched with the first insertion port and the second insertion port, the attachment plate is inserted into the first connecting groove and the second connecting groove 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 to the first connecting groove and the second connecting groove.

[0013] Optionally, a plurality of attachment plates are provided, and the plurality of 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; in 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; a drainage hole is provided at the lower end of the upper attachment plate of the two adjacent attachment plates, and the drainage hole includes a serrated opening and a cross-shaped opening formed at the end of the attachment plate.

[0014] Optionally, the living 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 living 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.

[0015] Optionally, the third placement box includes a third bottom plate and a third surrounding frame surrounded by the third bottom plate, the third bottom plate and the third surrounding 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 divide the storage space into a storage chamber and a drainage channel for the treated tail water to flow, the live stone structure is arranged in the storage chamber; 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 are successively reduced.

[0016] Optionally, the first placement box has a first plug plate formed at its bottom, the second placement box has a first slot formed at its top and a second plug plate formed at its bottom, the third placement box has a second slot formed at its top, the first plug plate is plugged into the first slot, and the second plug plate is plugged into the second slot; the first plug plate is configured to be pluggable with the second slot, and the third placement box can be connected to the first drain port after the first plug plate is inserted into the second slot.

[0017] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present application will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present application. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further described below in conjunction with the accompanying drawings: Figure 1A schematic diagram of the structure of a tailwater treatment device provided in an embodiment of the present application; Figure 2 This is an exploded view of the tailwater treatment device; Figure 3 This is an exploded view of the tailwater treatment device from another perspective; Figure 4 This is a schematic diagram of the structure of the algae purification module; Figure 5 This is an exploded view of the algae purification module; Figure 6 This is a schematic diagram of the structure of the third placement box in the fungus purification module; Figure 7 This is a schematic diagram of the live rock structure in the fungus purification module; Figure 8 This is a schematic diagram of the interior of the living rock structure; Fig. 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 the present application; Fig.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 the present application; Fig.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 the present application; Fig.12 A schematic diagram of total nitrogen content control experiment data in a tailwater treatment control experiment using the tailwater treatment device provided in the present application.

[0019] Among them, 1, first placement box; 10, first bottom plate; 100, first drain outlet; 11, first enclosure; 110, tail water inlet; 12, first cover plate; 13, fourth vertical plate; 14, first plug 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 installation groove; 24, second plug 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

[0020] The embodiments of the present application are described in detail below, and 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 with the same or similar functions. The embodiments based on the embodiments are intended to be used to explain the present application and cannot be understood as limiting the present application.

[0021] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0022] As mentioned above, when the symbiotic solution of bacteria and algae is used in the related art to treat the tail water of the aquaculture water body, the algae are easy to re-enter the aquaculture area with the continuously circulating water flow, thereby deteriorating the water quality of the aquaculture area, reducing the oxygen content of the water body, and blocking the respiratory organs of the fish. Commonly, after a period of use, the water tank or ornamental fish tank in the aquarium will produce yellow-green pollutants on the wall. The yellow-green pollutants are excessively grown algae. After research, the inventor found that there are certain problems in the design of the algae cultivation environment in the related art, which leads to the occurrence of the above situation.

[0023] To this end, this embodiment provides a tailwater treatment device for purifying aquaculture water, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As 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 be used to perform a preliminary filtration on the tailwater, and the particulate impurities in the tailwater can be filtered and intercepted to prevent impurities such as bait, excrement, scales, and water plants from flowing into the algae purification module and the fungus purification module. The filtration structure can be a filter net, filter cotton, etc. The tailwater purification device in the prior art is generally also provided with such a filtration structure, which will not be repeated here.

[0024] The algae purification module includes a second placement box 2 and an algae screen structure disposed in the second placement box 2. The second placement box 2 is connected to the first drain port 100 and forms a second drain port 200. 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 includes a third placement box 4 and a live stone structure disposed in the third placement box 4. The live stone structure is configured to be able to cultivate aerobic bacteria and anaerobic bacteria. The third placement box 4 is connected to the second drain port 200 and forms a tail water drain port 44. The fungus purification module can use the live stone structure to simultaneously cultivate aerobic bacteria and anaerobic bacteria, and convert ammonia nitrogen into nitrate and nitrite through the process of promoting nitrification and denitrification, thereby reducing the harmful ammonia nitrogen content in the water body. Nitrates and nitrites can be adsorbed and degraded by the algae screen structure in the algae purification module.

[0025] Therefore, the tail water treatment device provided in this embodiment can form an ecological purification treatment system capable of treating tail water through the linkage of the physical filtration module, the algae purification module and the fungus purification module.

[0026] 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. Therefore, when the algae grows to a certain extent, the attachment plate 3 can be conveniently removed for cleaning operations, so that harmful substances in the water body can be removed and algae can be prevented from entering the breeding water body. For ease of understanding, the tailwater treatment device provided in this embodiment can be applied to the breeding water tank in the aquarium. The breeding water body is contained in the breeding water tank. The tailwater inlet 110 and the tailwater outlet 44 in this embodiment are both connected to the breeding water tank.

[0027] Further, combined with Figure 5 As 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, the 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 arranged 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.

[0028] The algae described in this embodiment need to be cultured in advance. Specifically, a 0.5m×0.5m square frame is first installed using a polyvinyl chloride tube (PVC tube), and a gauze with a micropore diameter of 2mm is selected as the attachment base based on the hydrodynamic characteristics and the nutrient exchange rate. The gauze is wrapped three layers on the frame, and then the algae are attached to the gauze. After a certain period of time, the algae can grow to meet the use, the gauze is removed (or the polyvinyl chloride tube is taken out of the gauze), and then the gauze attached with the algae is arranged on the placement plate 30. Cultivating the algae on the gauze to a certain height in advance can increase the algae attachment area while enhancing the stability of the entire algae screen structure. Compared with the algae arrangement scheme in the prior art (algae are arranged directly on the surface or inside of the aquaculture water body), the scheme of attaching the algae to the gauze in this embodiment can make the algae more stably maintained in the second placement box 2, and significantly reduce the amount of algae flowing out of 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, clamps, screws, etc., so that the gauze can be fitted and positioned on the placement plate 30.

[0029] Furthermore, the inventors have found through research that, compared with higher algae species such as filamentous algae commonly used in the prior art bacterial-algae symbiosis scheme, lower algae exhibit a strong ability to absorb nutrients, especially in terms of absorbing nitrates and phosphates, which can effectively reduce the nitrogen and phosphorus load in the water body. That is, lower algae have a more significant function of regulating the steady state of the water environment. To this end, the algae used in this embodiment are lower algae. Specifically, the lower algae are algae that grow in the intertidal zone. In order to simulate the intertidal zone environment suitable for the growth of the lower algae, the thickness of the attachment base in this embodiment is configured to a set thickness, and the set thickness enables 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. The principle is described as follows: the tail water to be treated enters the second placement box 2 from the first drain port 100, and the tail water to be treated 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 according to 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), and 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 designed in advance 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.

[0030] The algae purification module in this embodiment further includes a light source (not shown in the figure) arranged on the inner wall of the second placement box 2, the light source is used to irradiate the algae, and a first shielding structure is arranged between the first placement box 1 and the second placement box 2, and a second shielding structure is arranged between the second placement box 2 and the third placement box 4, and both the first shielding structure and the second shielding structure are used to limit the light from irradiating the outside of the second placement box 2. By setting the light source, a more suitable growth environment can be provided for the algae. More importantly, unlike the scheme of "setting algae and a light source for irradiating the algae in the breeding water tank at the same time" in the related art, in this embodiment, the algae is arranged in the second placement box 2 through the attachment plate 3, and a first shielding structure is arranged between the first placement box 1 and the second placement box 2, and a second shielding structure is arranged between the second placement box 2 and the third placement box 4, so that most of the light emitted by the light source is irradiated to the inside of the second placement box 2 (a very small part will be irradiated to the first placement box 1 and the third placement box 4 through the first drainage port 100 and the second drainage port 200 respectively). Through the above-mentioned structural arrangement, an environment suitable for algae growth can be created in the second placement box 2 alone. 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 for them 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.

[0031] It should be noted that the intertidal lower algae has the characteristic of "competitive inhibition". Specifically, the growth of intertidal lower algae can inhibit the growth of other non-same algae. In this embodiment, a light source and an attachment base that can simulate the growth environment of the intertidal zone are specially set in the second placement box 2 to create a growth environment for the lower algae that is far superior to other locations. Therefore, after the lower algae in this embodiment begins to grow on the attachment base, it is difficult to grow rapidly even if a small amount of algae species flow to the outside of the second placement box 2.

[0032] Specifically in this embodiment, combined with Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in , the second placement box 2 in this embodiment includes a second enclosure with a concave cross-section, and the second enclosure 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 bottom plate 10, a first enclosure 11 enclosed around the first bottom plate 10, and a first cover plate 12 covered on the first enclosure 11, and a fourth vertical plate 13 is extended and formed on the first enclosure 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 bottom plate 10 and the fourth vertical plate 13, and the second shielding structure is an attachment plate 3. Specifically, in this embodiment, two attachment plates 3 are provided, and the second shielding structure is an 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 being projected into the third placement box 4.

[0033] like Figure 5 As shown in , the inner wall of the second vertical plate 21 in this embodiment is provided with a first connection groove 210 for matching with the attachment plate 3, and the inner wall of the third vertical plate 22 is provided with a second connection groove 220 for matching with the attachment plate 3. The first connection groove 210 extends to the end of the second vertical plate 21 and forms a first insertion port, and the second connection 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 connection groove 210 and the second connection 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 limits the attachment plate 3 to the first connection groove 210 and the second connection groove 220. Combined with 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.

[0034] 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 the restriction of the limiting structure on the fourth vertical plate 13 is lost, the attachment plate 3 can be easily slid out. After the algae on the attachment plate 3 is scraped and cleaned, 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 first insertion port and the second insertion port can be closed by the fourth vertical plate 13, thereby limiting the attachment plate 3 from falling out.

[0035] In this embodiment, the first placement box 1 is formed with a first plugging plate 14 at its bottom, the second placement box 2 is formed with a first slot 25 at its top and a second plugging plate 24 at its bottom, the third placement box 4 is formed with a second slot 45 at its top, the first plugging plate 14 is plugged into the first slot 25, and the second plugging plate 24 is plugged into the second slot 45. The above structural design can conveniently disassemble the first placement box 1, the second placement box 2 and the third placement box 4.

[0036] It is easy to understand that the above replacement operation process needs to first turn off the power to the water pump used to drive the circulation of the tail water to be treated, and then disassemble 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 port 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 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 means of clips or screws, and the fourth vertical plate 13 can be temporarily removed.

[0037] The attachment plate 3 described in this embodiment can be designed as one piece 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 drainage 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 a second drainage port 200. Figure 3 and Figure 4As shown in , this embodiment is described by taking the setting 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 on the placement plate 30 by means of snap connection, screw connection or bonding. In this embodiment, a light source installation groove 23 is set on the inner wall of the second placement box 2, and the light source includes a light bar, which is fixedly installed in the light source installation 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.

[0038] 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, and 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 further provided on both sides of the placement plate 30 to guide the tail water to be treated to flow along the placement plate 30.

[0039] Combination Figure 6 , Figure 7 and Figure 8 As shown in , the living rock structure in this embodiment includes an outer box body 5 and an inner box body 6 disposed in 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. Among them, 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 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, 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. At the same time, the living rock structure also includes a first filler disposed in the first chamber 52 and a second filler disposed in the second chamber 62. 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. 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 completely identical. Therefore, the average pore refers to the design nominal size of the selected first filler or second filler.

[0040] Through the above structural design, an oxygen-rich environment can be formed in the first chamber 52, and a low-oxygen environment can be formed in the second chamber 62. The oxygen-rich environment is conducive to the growth and reproduction of aerobic bacteria, and the low-oxygen 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 material, the larger square box is used as the outer box body 5, and the smaller square box is used as the inner box body 6. According to experimental data, the aperture of the first water inlet and outlet hole 53 can be selectively designed to be 1mm, and the aperture of the second water inlet and outlet hole 63 is 0.5mm. The first filler is volcanic stone and bacterial house particles, and the second filler is biochemical cotton. Biochemical cotton is filled in the second chamber 62 for the attachment and cultivation of anaerobic bacteria, and volcanic stone and bacterial house particles are filled in the first chamber 52 for the attachment and cultivation of aerobic bacteria. The tail water to be treated enters the active rock structure through the first water inlet and outlet holes 53. After passing through the volcanic rocks and bacterial house particles, the flow rate of the tail water to be treated gradually slows down, and finally slowly penetrates into the biochemical cotton in the second chamber 62, forming an anaerobic and oxygen-rich environment, thereby providing a favorable environment for the growth of aerobic bacteria and anaerobic bacteria. In practical applications, the oxygen concentration in the low-oxygen area is generally controlled below 1.7 mg / L, and the oxygen concentration in the oxygen-rich area is controlled below 9 mg / L.

[0041] It should be noted that the pores of the first filler include not only the gaps between adjacent volcanic rocks or bacteria house particles due to irregular shapes, but also the penetrating pores formed inside a single volcanic rock or bacteria house particle. In the process of flowing into the living rock structure, the tail water can flow through the gaps between adjacent volcanic rocks or bacteria house particles, or through the internal pores of a single volcanic rock or bacteria house particle. It is easy to understand that the volcanic rocks or bacteria house particles are distributed with honeycomb pores, which can be used for fungi to attach and grow. The pores of the second filler refer to the sparse and dense pores formed inside the biochemical cotton.

[0042] The above-mentioned live rock structure can provide a suitable growth environment for aerobic and anaerobic bacteria. In the nitrogen cycle of water bodies, aerobic bacteria use oxygen to decompose organic matter (such as fish excrement and food residues), and then convert toxic ammonia into nitrite through nitrification, and further oxidize it into nitrate. At the same time, anaerobic bacteria reduce nitrate to nitrogen gas through denitrification in a low-oxygen environment, thereby effectively treating nutrients and pollutants in the water.

[0043] In the prior art, anaerobic environment is generally generated by silt at the bottom of the water body. This scheme cannot control the size of the anaerobic environment, that is, the size of the environment suitable for the growth of anaerobic bacteria cannot be controlled. The live stone structure in this embodiment can consider the ratio of suitable aerobic bacteria to anaerobic bacteria according to factors such as the type of farmed fish and the size of the aquaculture water tank, and can adjust the ratio of the first chamber 52 and the second chamber 62 accordingly, so as to provide a suitable growth environment of suitable size for aerobic bacteria and anaerobic bacteria. In addition, once the anaerobic environment generated by silt in the prior art is generated, it cannot be transplanted to other places, resulting in a very slow establishment of an ecological purification system for the symbiosis of bacteria and algae. The live stone structure in this embodiment is artificially and actively created through the first box body and the second box body. Low oxygen and oxygen-rich areas can be created, and the live stone structure can be displaced. In this way, when the anaerobic environment and oxygen-rich environment as well as anaerobic bacteria and aerobic bacteria are cultivated in advance by the live stone structure, it can be directly placed in the tailwater treatment system according to the use needs, so that it can quickly cooperate with algae in the tailwater treatment system to carry out ecological purification operations and reduce waiting time.

[0044] 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 rock structure, the structure of the third placement box 4 is designed in this embodiment. Specifically, Figure 6 As shown in , the third placement box 4 in this embodiment includes a third bottom plate 40 and a third enclosure 41 enclosed on all sides of the third bottom plate 40. The third bottom plate 40 and the third enclosure 41 cooperate to form a receiving 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 receiving space into a receiving cavity and a drainage channel for the flow of tail water to be treated. The live stone structure is arranged in the receiving cavity. Specifically, a positioning hole 430 is provided on the second partition plate 43. The size and shape of the positioning hole 430 are adapted to the size and shape of the outer wall of the live stone structure. When assembling, the live stone structure is directly inserted into the positioning hole 430 so that the live stone structure can be fixedly installed in the receiving cavity. 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 one side of the third enclosure 41 is the first water inlet port 420, and the space between the lower end of the first baffle 42 and the second baffle 43 is the second water inlet port 421. The height positions of the first water inlet port 420, the tailwater outlet 44, and the second water inlet port 421 are successively lowered.

[0045] Through the above structural design, the tail water to be treated can first flow directly into the bottom of the third placement box 4 through the first water inlet port 420, and then enter the accommodating chamber through the second water inlet port 421, and then the tail water to be treated gradually rises and flows from low to high to better infiltrate the interior of the live stone structure. When the tail water to be treated flows to the tail water outlet 44, it automatically flows out from the tail water outlet 44 into the breeding water tank. The tail water is allowed to flow into the installation chamber by overflow, which can reduce the noise of the water flow and make the water flow more gentle, which is conducive to the growth of microorganisms on the live stone. In this way, the direct impact of the tail water flow on the artificial live stone can be reduced, and the bacteria and microorganisms on the surface of the artificial live stone can be prevented from being washed away by the excessively fast water flow. At the same time, it can ensure that the tail water flow contacted by the artificial live stone is a flowing water flow, which can increase the dissolved oxygen in the water, which is conducive to the growth of aerobic bacteria on the artificial live stone. In addition, the above overflow design can also be used to avoid the direct impact of the water flow on the artificial live stone, which can reduce the accumulation of sediments on the live stone and keep the live stone clean and effective.

[0046] The tailwater outlet 44 is arranged on a side wall of the third enclosure 41 . Optionally, an arc-shaped guide plate 46 may be arranged on the side wall to guide the treated tailwater to flow into the aquaculture water tank through the guide plate 46 .

[0047] The tailwater 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 tailwater treatment device is installed on the aquaculture water tank through the connecting frame 7 .

[0048] The tailwater treatment device provided in this embodiment can be applied to aquaculture water tanks, and the tailwater inlet 110 and the tailwater outlet 44 are both connected to the aquaculture water tank. Specifically, the tailwater treatment device can be hung and fixed on the aquaculture water tank through the connecting frame 7, and the tailwater to be treated in the aquaculture water tank is pumped into the first placement box 1 through the tailwater inlet 110 by a water pump, and then flows into the aquaculture water tank through the tailwater outlet 44 after being filtered and purified by the tailwater treatment device.

[0049] The tailwater treatment device provided in this embodiment filters suspended particles and impurities in the tailwater to be treated through a physical filtration module, prevents the subsequent algae purification module and fungus purification module from being blocked due to excessive particulate matter, effectively reduces the purification load of the entire device, and prolongs the service life of the algae purification module and the fungus purification module. The algae purification module is used to cultivate lower algae for biological purification of the tailwater to be treated. The lower algae can efficiently absorb excess nutrients in the tailwater to be treated to prevent eutrophication of the water body. In addition, the algae purification module is a detachable structure, which is convenient for regular cleaning and maintenance of the algae growth environment, thereby ensuring the long-term stable operation of the system and the continuous tailwater purification effect. The fungus purification module cultivates aerobic bacteria and anaerobic bacteria through the attachment of the live stone structure. Through the synergistic effect of the two types of fungi, it can effectively decompose organic matter, ammonia nitrogen or other harmful substances in the water, and significantly reduce the concentration of water pollutants. Through the above-mentioned physical filtration module, algae purification module and fungus purification module, the tailwater to be treated is filtered and purified through three layers, which can effectively remove organic matter in the tailwater to be treated and absorb and decompose water pollutants, thereby realizing in-situ purification of water quality.

[0050] like Figures 9 to 12 As shown in , the tailwater treatment device provided in this embodiment is used for comparative experiments. The same volume of aquaculture water tanks, water volume and fish schools are used for experiments. The control group does not perform tailwater treatment, and the experimental group uses the tailwater treatment device provided in this embodiment for treatment. The experimental period is set to four days. On each day of the experiment, the four major indicators of phosphate, total phosphorus, ammonia nitrogen and total nitrogen in the aquaculture tailwater are tested. During the experiment, the temperature is maintained at 18°C, the salinity is 27-28psu, and the light cycle is 12L:12D (7:00-19:00). The concentrations of the four major indicators of phosphate, total phosphorus, ammonia nitrogen and total nitrogen before the start of the experiment are 0.031 mg / L, 0.06 mg / L, 0.236 mg / L and 0.395 mg / L respectively.

[0051] like Fig. 9 and Fig.10 As shown in the figure, the phosphate and total phosphorus contents of the control group and the experimental group showed certain fluctuations. After four days of the 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. Fig.11 As shown in the figure, the ammonia nitrogen content of 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 of the experimental group was significantly lower than that of the control group. On the fourth day of the experiment, the difference between the experimental data of the two groups further expanded. Fig.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.

[0052] Through the above experimental comparison, it can be seen that the tailwater treatment device has an obvious effect on the purification and removal of nitrogen and phosphorus nutrients.

[0053] The above are only specific embodiments of the present application, but the protection scope 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 modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A tailwater 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 tailwater inlet (110) and a first drain outlet (100) lower than the tailwater 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 connected to the first drainage port (100) and forms a second drainage port (200); and A fungus purification module, comprising a third placement box (4) and a live stone structure arranged in the third placement box (4), the live stone structure being configured to be able to cultivate aerobic bacteria and anaerobic bacteria, the third placement box (4) being in communication with the second drainage port (200) and forming a tailwater drainage 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); the second placement box (2) is detachably connected to the first placement box (1) and the third placement box (4), respectively.

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) so ​​as 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 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 soaked 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 arranged between the first placement box (1) and the second placement box (2), and a second shielding structure being arranged 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 to the outside of 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 surrounding frame (11) surrounding the first bottom plate (10), and a first cover plate (12) covering the first surrounding frame (11), and a fourth vertical plate (13) extending from the first surrounding 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 connection groove (210) for matching with the attachment plate (3), and the inner wall of the third vertical plate (22) is provided with a second connection groove (220) for matching with the attachment plate (3), the first connection groove (210) extending to the end of the second vertical plate (21) and forming a first insertion port, and the second connection groove (220) extending to the end of the third vertical plate (22) and forming 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) being inserted into the first connection groove (210) and the second connection groove (220) through the first insertion port and the second insertion port, the limiting structure being arranged at the first insertion port and the second insertion port and limiting 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 connected in sequence, so as 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 drainage 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 drainage 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 sawtooth opening and a cross-shaped opening formed at the end of the attachment plate (3).

8. The tail water treatment device according to any one of claims 1 to 7, characterized in that: 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 an average pore size of the first filler is greater than an average pore size of the second filler; 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) comprises a third bottom plate (40) and a third surrounding frame (41) enclosed on four sides of the third bottom plate (40), the third bottom plate (40) and the third surrounding frame (41) cooperate to form a storage space, the third placement box (4) further comprises 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 to flow, and the live rock 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 baffle (42) and a second water inlet port (421) located between the lower end of the first baffle (42) and the second baffle (43); the first water inlet port (420) is located directly below the second drainage port (200), and the height positions of the first water inlet port (420), the tailwater drainage port (44) and the second water inlet port (421) are successively lowered.

10. The tail water treatment device according to any one of claims 1 to 7, characterized in that: The first placement box (1) has a first plugging plate (14) formed at its bottom, the second placement box (2) has a first slot (25) formed at its top and a second plugging plate (24) formed at its bottom, the third placement box (4) has a second slot (45) formed at its top, the first plugging plate (14) is plugged into and matched with the first slot (25), and the second plugging 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).

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