Biochemical filtering device for fish culture water

Abstract

The utility model provides a biochemical filtering device for water for fish culture. The biochemical filtering device for the water for fish culture comprises a plurality of detachable fluidized bed filler filtering layers which are stacked up and down, any fluidized bed filler filter layer comprises a groove body for accommodating fluidized bed filler, a bottom plate of the groove body is detachable, and a through hole for water to pass through is formed in the bottom plate. According to the biochemical filtering device for the water for fish culture, the multiple layers of fluidized bed filler filtering layers which are stacked up and down and are detachable are used, so that filter materials are more convenient and easier to replace when the biochemical filtering device is used for fish culture in a scene with extremely high filtering capacity, meanwhile, the layers are in non-fixed connection, air can enter the device conveniently, and biochemical bacterium culture and filtering are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology and relates to a biochemical filtration device for fish farming water. Background Technology

[0002] In fish farming, water purification and improvement are crucial for ensuring the sustainable development of aquatic resources. To meet increasingly stringent environmental requirements and the diverse needs of fish farming, the development of efficient, reliable, and scalable water purification technologies is of paramount importance.

[0003] Currently, large trickle filters are often used in fish farming to purify water. However, existing trickle filters often have the following problems: ① Low filtration efficiency, unable to effectively remove suspended solids, organic pollutants, and harmful substances such as ammonia nitrogen; ② High energy consumption, heavy filter media with short replacement cycles, making it difficult to achieve long-term stable operation. In the fish farming industry, where filtration demand is extremely high, this can easily lead to increased costs, reduced efficiency, and impact on economic benefits; ③ Complex structure and high maintenance costs of trickle filters.

[0004] Therefore, developing a biochemical filtration device for fish farming water that can better decompose organic pollutants, adsorb harmful substances such as ammonia nitrogen, and has a certain self-cleaning ability, can extend the service life of the equipment, and reduce operating costs has become a technical need that the fish farming industry urgently needs to address.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a biochemical filtration device for fish farming water, so as to solve the problems that the drip boxes for fish farming water in the prior art often have limited filtration efficiency, difficulty in replacing and cleaning filter media, and high maintenance costs.

[0007] To achieve the above objectives, this utility model provides a biochemical filtration device for fish farming water. The biochemical filtration device for fish farming water includes a multi-layer fluidized bed packing filter layer that is stacked and detachable. Each fluidized bed packing filter layer includes a tank for accommodating the fluidized bed packing, and the bottom plate of the tank is detachable, with through holes formed on the bottom plate for water supply.

[0008] In one specific embodiment, any fluidized bed packing filter layer further includes a baffle plate disposed on the bottom plate for blocking the fluidized bed packing. The baffle plate divides the tank into a rapid filtration zone and a slow filtration zone. The aperture of the through holes formed on the bottom plate corresponding to the rapid filtration zone is larger than the aperture of the through holes formed on the bottom plate corresponding to the slow filtration zone.

[0009] In a more specific embodiment, at least one pair of adjacent fluidized bed packing filter layers have fast filtration zones and slow filtration zones that are staggered in the vertical direction.

[0010] In one specific embodiment, a trough-shaped water separation filter layer can be detachably connected above the fluidized bed packing filter layer, and the bottom of the trough of the water separation filter layer has a plurality of fifth through holes.

[0011] In one specific embodiment, the water inlet of the biochemical filtration device is located near its top.

[0012] In a more specific embodiment, the sidewall of the water-separating filter layer is further provided with a plurality of water inlet holes.

[0013] In one specific embodiment, the biochemical filtration device also includes a top cover.

[0014] In a more specific embodiment, a top cover may also be detachably connected above the water separation filter layer.

[0015] In one specific embodiment, the bottom of the fluidized bed packing filter layer may also be detachably connected to a water outlet layer, which forms a water outlet.

[0016] In one specific embodiment, the top of any of the fluidized bed packing filter layers further protrudes upward to form a horizontally closed filter layer support frame, and any of the fluidized bed packing filter layers extends inward from the bottom of the side wall to form a horizontal limiting frame, the free end of the horizontal limiting frame abutting against the filter layer support frame to horizontally limit the upper fluidized bed packing filter layer.

[0017] In one specific embodiment, the inner sidewall of any of the fluidized bed packing filter layers protrudes to form a base plate support structure for supporting the base plate.

[0018] In a more specific embodiment, the base plate support structure is a support ring.

[0019] In a more specific embodiment, the top of the filter layer support frame abuts against the bottom of the base plate support structure to achieve stacking.

[0020] In a more specific embodiment, the height of the filter layer support frame is greater than the distance between the horizontal limiting frame and the base plate support structure.

[0021] In one specific embodiment, the fluidized bed packing filter layer includes a plurality of first fluidized bed packing filter layers and second fluidized bed packing filter layers, and adjacent first fluidized bed packing filter layers and second fluidized bed packing filter layers are detachably connected.

[0022] In one specific embodiment, the fluidized bed filter layer is filled with fluidized bed packing material, and the filling ratio of the fluidized bed packing material in the fluidized bed filter layer is 80-95%.

[0023] In a more specific embodiment, the fluidized bed packing is selected from one or more of the following: K1 type packing, K2 type packing, K3 type packing, K4 type packing, K5 type packing, QY-PE02 packing, QY-PE03 packing, QY-PE04 packing, QY-PE08 packing, Madouyoujunku 7PLUS packing, and Madouyoujunku 5S packing.

[0024] In a more specific embodiment, the first fluidized bed packing filter layer includes a first base plate, the first base plate protruding upward to form a first partition that divides the first fluidized bed packing filter layer into two first filtration zones; second partitions are formed on both sides of the first base plate protruding upward to divide the first filtration zone into a plurality of alternately distributed and fluidly connected first rapid filtration zones and first slow filtration zones; the first base plate has a plurality of first through holes in the first rapid filtration zone and a plurality of second through holes with a pore size smaller than the first through holes in the first slow filtration zone; the second fluidized bed packing filter layer includes The second base plate has an upwardly protruding third partition that divides the second fluidized bed packing filter layer into two second filtration zones; the second base plate on both sides of the third partition has an upwardly protruding fourth partition that divides the second filtration zone into several alternately distributed and fluidly connected second rapid filtration zones and second slow filtration zones; the second base plate has several third through holes in the second rapid filtration zone and several fourth through holes with a diameter smaller than the third through holes in the second slow filtration zone; in the vertical direction, at least one first slow filtration zone coincides with the second rapid filtration zone, and at least one first rapid filtration zone coincides with the second slow filtration zone.

[0025] In this application, it is sufficient to ensure that one side of the slow filtration zone is adjacent to the fast filtration zone in the horizontal direction. When one side of a slow filtration zone is a fast filtration zone, the other side can be another slow filtration zone or another fast filtration zone. For example, the arrangement of fast filtration zones and slow filtration zones in any fluidized bed packing filter layer can be "fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...", "fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...", "fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone...", "fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...".

[0026] In one specific embodiment, in the first fluidized bed packing filter layer, the rapid filtration zone and the slow filtration zone are arranged as "first slow filtration zone, first rapid filtration zone, first rapid filtration zone, first slow filtration zone"; in the second fluidized bed packing filter layer, the rapid filtration zone and the slow filtration zone are arranged as "first rapid filtration zone, first slow filtration zone, first slow filtration zone, first rapid filtration zone".

[0027] In a further embodiment, the height of the first partition is greater than the height of the second partition.

[0028] In a further embodiment, the height of the third partition is greater than the height of the fourth partition.

[0029] In a further specific embodiment, after the first fluidized bed packing filter layer and the second fluidized bed packing filter layer are stacked, the distance between the second partition and / or the fourth partition and the bottom plate of the upper layer is less than the minimum diameter of the fluidized bed packing.

[0030] In a further specific embodiment, after the first fluidized bed packing filter layer and the second fluidized bed packing filter layer are stacked, the distance between the first partition and / or the third partition and the bottom plate of the upper layer is 2 to 4 cm.

[0031] In a further specific embodiment, after the first fluidized bed packing filter layer and the second fluidized bed packing filter layer are stacked, the distance between the second partition and / or the fourth partition and the bottom plate of the upper layer is 4 to 6.5 cm.

[0032] In a further specific embodiment, the number of the first fluidized bed packing filter layer and / or the second fluidized bed packing filter layer is 1 to 5.

[0033] In a further embodiment, the top of the second fluidized bed packing filter layer also protrudes upward to form a first filter layer support frame that is closed in the horizontal direction. The first fluidized bed packing filter layer extends inward from the bottom of the side wall to form a first horizontal limiting frame. The free end of the first horizontal limiting frame abuts against the first filter layer support frame to support and horizontally limit the upper layer of the first fluidized bed packing filter layer.

[0034] In a further embodiment, the inner sidewall of the first fluidized bed packing filter layer protrudes to form a first base plate support structure for supporting the first base plate.

[0035] In a further embodiment, the inner sidewall of the second fluidized bed packing filter layer protrudes to form a second bottom plate support structure for supporting the second bottom plate.

[0036] In a further specific embodiment, the first base plate support structure and / or the second base plate support structure is a support ring.

[0037] In a further embodiment, the top end of the first filter layer support frame abuts against the bottom end of the first base plate support structure, and the top end of the second filter layer support frame abuts against the bottom end of the water-dividing filter layer, so as to achieve stacking.

[0038] In a further embodiment, the height of the first filter layer support frame is greater than the distance from the first horizontal limiting frame to the first base plate support structure.

[0039] In a further embodiment, the ratio of the diameter of the first through hole to the diameter of the second through hole is (2.5 to 3.5):1.

[0040] In a further embodiment, the ratio of the diameter of the third through hole to the diameter of the fourth through hole is (2.5 to 3.5):1.

[0041] In a further embodiment, the diameter of the first through hole and / or the third through hole is 10 to 31.5 mm.

[0042] In a further embodiment, the diameter of the second through hole and / or the fourth through hole is 4 to 9 mm.

[0043] In a more specific embodiment, the top of the first fluidized bed packing filter layer also protrudes upward to form a second filter layer support frame that is closed in the horizontal direction. The water-separating filter layer extends inward from the bottom of the side wall to form a second horizontal limiting frame. The free end of the second horizontal limiting frame abuts against the second filter layer support frame to support and horizontally limit the upper water-separating filter layer.

[0044] In a further embodiment, the height of the second filter layer support frame is greater than the distance from the second horizontal limiting frame to the water-dividing filter layer plate.

[0045] In a more specific embodiment, the top of the water-separating filter layer also protrudes upward to form a horizontally closed third filter layer support frame, which is used to support the top cover.

[0046] As described above, the drip box of this utility model has the following beneficial effects:

[0047] 1) The biochemical filtration device for fish farming water described in this application uses a multi-layer fluidized bed filter layer that is stacked vertically and removable, making it easier and more convenient to replace the filter media in the context of fish farming where the filtration volume is extremely high. At the same time, the non-fixed connection between the layers facilitates the entry of air into the device, which is beneficial for biochemical cultivation and filtration.

[0048] 2) In the biochemical filtration device for fish farming water described in this application, the first partition and the second partition divide the biochemical filtration device for fish farming water into two filtration spaces, so that the water flow and the filter media can be in more sufficient contact, thereby improving the biochemical filtration effect.

[0049] 3) In the biochemical filtration device for fish farming water described in this application, the through-hole diameter of the first slow filtration zone and / or the second slow filtration zone is relatively small, so that the fish farming water flows out of the above-mentioned zone at a slower speed, thereby improving the biochemical filtration time and effect; when the speed is too slow and too much fish farming water is retained, the fish farming water can pass through the second partition and / or the fourth partition and enter the first rapid filtration zone and / or the second rapid filtration zone, preventing the fish farming water from overflowing the biochemical filtration device for fish farming water.

[0050] 4) In the biochemical filtration device for fish farming water described in this application, at least one pair of adjacent fluidized bed packing filter layers have a fast filtration zone and a slow filtration zone that are staggered in the vertical direction. After rapid filtration, the fish farming water falls into the slow filtration zone for slow filtration, so that all fish farming water passing through the biochemical filtration device for fish farming water is fully filtered, ensuring filtration efficiency while improving filtration effect.

[0051] 5) In the biochemical filtration device for fish farming water described in this application, fluidized bed packing is used. Compared with traditional static filter media, fluidized bed packing is lighter and easier to replace. During the filtration process, each fluidized bed packing is driven by water flow to collide with each other, causing impurities deposited on the surface to fall off, reducing the frequency of filter media replacement and cleaning. It is suitable for scenarios with large water consumption in fish farming and reduces the cost of filter media replacement and maintenance. Attached Figure Description

[0052] Figure 1 The diagram shown is a three-dimensional structural schematic of the biochemical filtration device for fish farming water described in this utility model.

[0053] Figure 2 The image shown is a half-section structural schematic diagram of the biochemical filtration device for fish farming water described in this utility model.

[0054] Figure 3 The diagram shown is a structural schematic of the first fluidized bed packing filter layer in this invention.

[0055] Figure 4 The diagram shown is a structural schematic of the second fluidized bed packing filter layer in this invention.

[0056] Figure 5 The diagram shown is a half-sectional view of the first fluidized bed packing filter layer and the second fluidized bed packing filter layer in this invention.

[0057] Figure 6 The image shown is a partially enlarged schematic diagram of the fluidized bed packing filter layer described in this utility model.

[0058] Figure 7 The diagram shown is a structural schematic of the water separation and filtration layer described in this utility model.

[0059] Figure 8 The diagram shown is a schematic diagram of the split structure of the fluidized bed packing described in this utility model.

[0060] Explanation of reference numerals in the attached figures

[0061] 10 First fluidized bed packing filter layer, 11 Second partition, 12 First partition, 13 First bottom plate, 131 First through hole, 132 Second through hole, 14 Second filter layer support frame, 15 First bottom plate support structure, 16 First horizontal limiting frame, 20 Second fluidized bed packing filter layer, 21 Fourth partition, 22 Third partition, 23 Second bottom plate, 231 Fourth through hole, 232 Third through hole, 24 First filter layer support frame, 25 Second bottom plate support structure, 30 Water distribution filter layer, 31 Water inlet hole, 32 Fifth through hole, 33 Third filter layer support frame, 34 Second horizontal limiting frame, 40 Top cover, 50 Water outlet layer, 51 Water outlet, 60 Fluidized bed packing, 61 Hollowed-out protective shell, 62 Bacterial cultivation packing. Detailed Implementation

[0062] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0063] Please see Figures 1-8This embodiment provides a biochemical filtration device for fish farming water. It should be noted that the structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms "upper" and "lower" refer to vertical directions relative to the horizontal ground and are used merely for clarity. Similarly, the terms "left," "right," "middle," and "one" are also used merely for clarity and not to limit the scope of this invention. Changes or adjustments to these relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] See Figures 1-8 This embodiment provides a biochemical filtration device for fish farming water. The device includes multiple stacked and detachable fluidized bed filter media layers. Each fluidized bed filter media layer includes a tank for accommodating the fluidized bed filter media, and the bottom plate of the tank is detachable, with through holes formed on the bottom plate for water supply. The multiple stacked and detachable fluidized bed filter media layers make it easier to replace filter media in fish farming scenarios with extremely high filtration volumes. Furthermore, the non-fixed connection between the layers facilitates air entry into the device, which is beneficial for biochemical cultivation and filtration.

[0066] In a specific embodiment, such as Figures 2-5As shown, the fluidized bed filter layer also includes a baffle plate disposed on the bottom plate to block the fluidized bed packing. The baffle plate divides the tank into a rapid filtration zone and a slow filtration zone. The aperture of the through holes formed on the bottom plate corresponding to the rapid filtration zone is larger than that of the through holes formed on the bottom plate corresponding to the slow filtration zone. The baffle plate divides the fluidized bed filter layer into two filtration spaces, allowing for more thorough contact between the water flow and the filter media, thus improving the biological filtration effect. The smaller aperture of the through holes in the slow filtration zone results in a slower flow rate of the aquaculture water out of the aforementioned zone, increasing the biological filtration time and effect. When the flow rate is too slow and too much aquaculture water remains, the aquaculture water can bypass the baffle plate and enter the rapid filtration zone, preventing the aquaculture water from overflowing the biological filtration device for aquaculture water.

[0067] In a more specific embodiment, such as Figures 2-5 As shown, at least one adjacent pair of fluidized bed filter media has a staggered arrangement of rapid filtration and slow filtration zones in the vertical direction. At least one rapid filtration zone overlaps with a slow filtration zone in the vertical direction. The fish farming water, after rapid filtration, falls into the slow filtration zone for slow filtration, ensuring that all fish farming water passing through the biochemical filtration device is thoroughly filtered, thus guaranteeing filtration efficiency while improving filtration effectiveness.

[0068] In a specific embodiment, such as Figure 1 , 2 As shown in Figure 7, a trough-shaped water-distributing filter layer 30 can be detachably connected above the fluidized bed filter layer. The bottom of the trough of the water-distributing filter layer 30 has several fifth through holes 32. The water-distributing filter layer 30 performs preliminary filtration of the fishpond water flowing into the biochemical filtration device for fish farming. Larger particles are physically filtered through the fifth through holes 32. Simultaneously, after passing through the fifth through holes 32, the fishpond water enters the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20 in a uniform, fine, and / or dripping state for further filtration. This process increases dissolved oxygen in the water, which is more conducive to the cultivation of bacteria in the fluidized bed filter layer 60, thus improving the efficiency of biological filtration.

[0069] In a specific embodiment, such as Figure 1 , 2 As shown in Figures 7 and 8, the water inlet 31 of the biochemical filtration device is located near its top.

[0070] In a more specific embodiment, such as Figure 1 , 2 As shown in Figure 7, the sidewall of the water separation filter layer 30 is also formed with a plurality of water inlet holes 31.

[0071] In a specific embodiment, such as Figure 1 , 2As shown in Figures 7 and 8, the biochemical filtration device also includes a top cover 40.

[0072] In a more specific embodiment, such as Figure 1 , 2 As shown in Figure 7, a top cover can be detachably connected to the water separation filter layer 30. The top cover 40 prevents external impurities from falling into the biochemical filtration device for fish farming water, ensuring the water purification efficiency of the device.

[0073] In a specific embodiment, such as Figure 2 As shown, a water outlet layer 50 can be detachably connected to the bottom of the fluidized bed filter layer, and the water outlet layer 50 forms a water outlet 51. The water outlet layer 50 stores and guides the purified water for fish farming. The shape and size of the water outlet can be adjusted according to the actual filtration efficiency and water output requirements. For example, the shape of the water outlet can be one or more of rectangle, circle, and ellipse, and the size of the water outlet can be 0.5 to 0.72 m. 2 .

[0074] In a specific embodiment, such as Figures 2-6 As shown, any of the fluidized bed packing filter layers has an upwardly protruding, horizontally closed filter layer support frame at the top, and any of the fluidized bed packing filter layers has a horizontal limiting frame extending inward from the bottom of the side wall, with the free end of the horizontal limiting frame abutting against the filter layer support frame to horizontally limit the upper fluidized bed packing filter layer.

[0075] In a specific embodiment, such as Figures 2-6 As shown, the inner wall of any of the fluidized bed packing filter layers protrudes to form a bottom plate support structure for supporting the bottom plate.

[0076] In a more specific embodiment, such as Figures 2-6 As shown, the base plate support structure is a support ring. The support ring can be a closed or open ring, such as a strip or a semi-circular ring.

[0077] In a more specific embodiment, such as Figures 2-6 As shown, the top of the filter layer support frame abuts against the bottom of the base plate support structure to achieve stacking.

[0078] In a more specific embodiment, such as Figures 2-6 As shown, the height of the filter layer support frame is greater than the distance between the horizontal limiting frame and the bottom plate support structure.

[0079] In a specific embodiment, such as Figures 1-7As shown, the fluidized bed packing filter layer includes several first fluidized bed packing filter layers 10 and second fluidized bed packing filter layers 20, and adjacent first fluidized bed packing filter layers 10 and second fluidized bed packing filter layers 20 are detachably connected.

[0080] In a specific embodiment, such as Figures 1-8 As shown, the fluidized bed filter layer is filled with fluidized bed packing 60, and the filling ratio of the fluidized bed packing 60 in the fluidized bed filter layer is 80-95%. For example, the filling ratio can be 80-82%, 82-84%, 84-86%, 86-88%, 88-90%, 90-92%, 92-94%, or 94-95%. Figures 1-8 In the specific embodiment shown, the filling ratio is 90%. A filling ratio of 80-95% allows the fluidized bed packing material 60 to have sufficient space to move under the action of water flow, thereby improving the biochemical filtration efficiency, while maximizing the use of space in the biochemical filtration device for fish farming water.

[0081] In this application, the filling ratio refers to the ratio of the volume of fluidized bed packing 60 filling the first fluidized bed packing filter layer 10 and / or the second fluidized bed packing filter layer 20 in a static state to the total internal volume of the first fluidized bed packing filter layer 10 and / or the second fluidized bed packing filter layer 20.

[0082] In a more specific embodiment, such as Figures 1-8 As shown, the fluidized bed packing 60 is selected from one or more of the following: K1 type packing, K2 type packing, K3 type packing, K4 type packing, K5 type packing, QY-PE02 packing, QY-PE03 packing, QY-PE04 packing, QY-PE08 packing, Madouyoujunku 7PLUS packing, and Madouyoujunku 5S packing. In a... Figure 8 In the illustrated embodiment, the fluidized bed packing 60 is the Macadouyou Bacterial Library 7PLUS packing. The Macadouyou Bacterial Library 7PLUS packing includes a perforated protective shell 61 and a culture medium 62. Compared to traditional static filter media, the fluidized bed packing 60 with its perforated structure is lighter and easier to replace. During filtration, the fluidized bed packings 60 collide with each other driven by water flow, dislodging impurities deposited on the surface, reducing the frequency of filter media replacement and cleaning. This makes it suitable for large-scale fish farms with high water consumption, lowering filter media replacement and maintenance costs.

[0083] In a more specific embodiment, such as Figures 1-6As shown, the first fluidized bed filter layer 10 includes a first base plate 13, which protrudes upward to form a first partition 12 plate that divides the first fluidized bed filter layer 10 into two first filtration zones; second partitions 11 protrude upward on both sides of the first base plate 13, which are used to divide the first filtration zone into several alternately distributed and fluidly connected first rapid filtration zones and first slow filtration zones; the first base plate 13 forms several first through holes 131 in the first rapid filtration zone and several second through holes 132 with a pore size smaller than the first through holes 131 in the first slow filtration zone; the second fluidized bed filter layer 20 includes a second The second base plate 23 has a third partition 22 that protrudes upward to divide the second fluidized bed packing filter layer 20 into two second filtration zones; the second base plates 23 on both sides of the third partition 22 have a plurality of fourth partitions 21 that divide the second filtration zone into a plurality of alternately distributed and fluidly connected second rapid filtration zones and second slow filtration zones; the second base plate 23 has a plurality of third through holes 232 in the second rapid filtration zone and a plurality of fourth through holes 231 with a diameter smaller than the third through holes 232 in the second slow filtration zone; in the vertical direction, at least one first slow filtration zone coincides with the second rapid filtration zone, and at least one first rapid filtration zone coincides with the second slow filtration zone. The first partition 12 and the second partition 22 divide the biochemical filtration device for fish farming water into two filtration spaces, allowing for more thorough contact between the water flow and the filter media, thus improving the biochemical filtration effect. The smaller pore size of the first slow filtration zone and / or the second slow filtration zone results in a slower flow rate of the fish farming water out of these zones, increasing the biochemical filtration time and effect. When the flow rate is too slow and too much fish farming water remains, the fish farming water can pass through the second partition 11 and / or the fourth partition 21 into the first rapid filtration zone and / or the second rapid filtration zone, preventing the fish farming water from overflowing the biochemical filtration device. Since either the rapid filtration zone or the slow filtration zone overlaps vertically, the fish farming water that has undergone rapid filtration falls into the slow filtration zone for slow filtration, ensuring that all fish farming water passing through the biochemical filtration device is fully filtered, guaranteeing filtration efficiency while improving the filtration effect.

[0084] In this application, it is sufficient to ensure that one side of the slow filtration zone is adjacent to the fast filtration zone in the horizontal direction. When one side of a slow filtration zone is a fast filtration zone, the other side can be another slow filtration zone or another fast filtration zone. For example, the arrangement of fast filtration zones and slow filtration zones in any fluidized bed packing filter layer can be "fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...", "fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...", "fast filtration zone, slow filtration zone, fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone...", "fast filtration zone, slow filtration zone, slow filtration zone, fast filtration zone, slow filtration zone...".

[0085] In a specific embodiment, such as Figures 1-6 As shown, in the first fluidized bed filter layer 10, the rapid filtration zone and the slow filtration zone are arranged as "first slow filtration zone, first rapid filtration zone, first rapid filtration zone, first slow filtration zone"; in the second fluidized bed filter layer 20, the rapid filtration zone and the slow filtration zone are arranged as "second rapid filtration zone, second slow filtration zone, second slow filtration zone, second rapid filtration zone". In the vertical direction, any one of the first slow filtration zones coincides with any one of the second rapid filtration zones, and any one of the first rapid filtration zones coincides with any one of the second slow filtration zones.

[0086] In a further specific embodiment, such as Figures 1-6 As shown, the height of the first partition 12 is greater than the height of the second partition 11.

[0087] In a further specific embodiment, such as Figures 1-6 As shown, the height of the third partition 22 is greater than the height of the fourth partition 21.

[0088] In a further specific embodiment, such as Figures 1-6 As shown, after the first fluidized bed packing filter layer 10 and the second fluidized bed packing filter layer 20 are stacked, the distance between the second partition 11 and / or the fourth partition 21 and the bottom plate of the upper layer is less than the minimum diameter of the fluidized bed packing 60.

[0089] In a further specific embodiment, such as Figures 1-6 As shown, after the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20 are stacked, the distance between the first partition 12 and / or the third partition 22 and the bottom plate of the upper layer is 2-4 cm. The distance can be 2-2.5 cm, 2.5-3 cm, 3-3.5 cm, or 3.5-4 cm. The distance between the first partition 12 and / or the third partition 22 and the bottom plate of the upper layer ensures that the aquaculture water between the first and second filtration zones will not flow between them under normal filtration conditions, thus separating the filtration zones, increasing the contact time between the filter media and the aquaculture water, and improving the filtration effect; at the same time, it leaves a certain space so that if one side of the filtration zone becomes blocked in case of an accident, water can flow into the other side of the filtration zone, preventing the aquaculture water from overflowing into the biological filtration device for aquaculture water. Figures 2-6 In the specific embodiment shown, the spacing is 2.5cm.

[0090] In a further specific embodiment, such as Figures 1-6As shown, after the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20 are stacked, the distance between the second partition 11 and / or the fourth partition 21 and the bottom plate of the upper layer is 4-6.5 cm. The distance can be 4-4.5 cm, 4.5-5 cm, 5-5.5 cm, 5.5-6 cm, or 6-6.5 cm. The distance between the second partition 11 and / or the fourth partition 21 and the bottom plate of the upper layer ensures that the fluidized bed packing 60 between the first rapid filtration zone and the first slow filtration zone, and between the second rapid filtration zone and the second slow filtration zone, prevents mutual flow, thus separating the filtration zones, increasing the contact time between the filter media and the aquaculture water, and improving the filtration effect; at the same time, it leaves a certain space so that if too much aquaculture water accumulates in the slow filtration zone, the aquaculture water can enter the rapid filtration zone, ensuring the overall filtration smoothness of the device and preventing the aquaculture water from overflowing. Figures 2-6 In the specific embodiment shown, the spacing is 5cm.

[0091] In a further specific embodiment, such as Figures 1-6 As shown, the number of the first fluidized bed packing filter layer 10 and / or the second fluidized bed packing filter layer 20 is 1 to 5. For example, the number of the first fluidized bed packing filter layer 10 and / or the second fluidized bed packing filter layer 20 can be 1, 2, 3, 4, or 5. In a... Figures 1-6 In the specific embodiment shown, the number of the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20 is one. The number of the first fluidized bed filter layer 10 and / or the second fluidized bed filter layer 20 can be arbitrarily selected, as long as the filtration effect can be achieved.

[0092] In a further specific embodiment, such as Figures 1-6 As shown, the top of the second fluidized bed packing filter layer 20 also protrudes upward to form a first filter layer support frame 24 that is closed in the horizontal direction. The first fluidized bed packing filter layer 10 extends inward from the bottom of the side wall to form a first horizontal limiting frame 16. The free end of the first horizontal limiting frame 16 abuts against the first filter layer support frame 24 to support and horizontally limit the upper layer of the first fluidized bed packing filter layer 10.

[0093] In a further specific embodiment, such as Figures 1-6 As shown, the inner sidewall of the first fluidized bed filter layer 10 protrudes to form a first base plate support structure 15 for supporting the first base plate 13. The first base plate support structure 15 ensures that the first base plate 13 remains stable in the same position during filtration, and when replacing the filter media, only the first base plate 13 needs to be lifted, making disassembly and assembly convenient.

[0094] In a further specific embodiment, such as Figures 1-6As shown, the inner sidewall of the second fluidized bed filter layer 20 protrudes to form a second base plate support structure 25 for supporting the second base plate 23. The second base plate support structure 25 ensures that the second base plate 23 remains stable in the same position during filtration, and when replacing the filter media, only the second base plate 23 needs to be lifted, making disassembly and assembly convenient.

[0095] In a like Figures 1-6 In the specific embodiment shown, the first base plate support structure 15 and / or the second base plate support structure 25 are support rings.

[0096] In a like Figures 1-6 In the specific embodiment shown, the top end of the first filter layer support frame 24 abuts against the bottom end of the first base plate support structure 15, and the top end of the second filter layer support frame 14 abuts against the bottom end of the water-dividing filter layer 30, so as to achieve stacking.

[0097] In a like Figures 1-6 In the specific embodiment shown, the height of the first filter layer support frame 24 is greater than the distance from the first horizontal limiting frame 16 to the first base plate support structure 15. This allows air to enter the biochemical filtration device through the gap between the first horizontal limiting frame 16 and the first filter layer support frame 24. At the same time, the upwardly protruding first filter layer support frame 24 plays a role in preventing water overflow when there is too much water in the biochemical filtration device for fish farming water.

[0098] In a further specific embodiment, such as Figures 1-6 As shown, the ratio of the diameter of the first through hole 131 to the diameter of the second through hole 132 is (2.5~3.5):1.

[0099] In a further specific embodiment, such as Figures 1-6 As shown, the diameter ratio of the third through hole 232 to the fourth through hole 231 is (2.5~3.5):1. The diameter ratio can also be (2.5~2.7):1, (2.7~2.9):1, (2.9~3.0):1, (3.0~3.2):1, (3.0~3.2):1, or (3.2~3.5):1. In a... Figures 2-6 In the specific embodiment shown, the aperture ratio is 3:1.

[0100] In a further specific embodiment, such as Figures 1-6 As shown, the diameter of the first through hole 131 and / or the third through hole 232 is 10–31.5 mm. For example, the diameter of the first through hole 131 and / or the third through hole 232 can be 10–13 mm, 13–16 mm, 16–18 mm, 18–22 mm, 22–25 mm, 25–28 mm, or 28–31.5 mm. In a... Figures 2-6 In the specific embodiment shown, the diameter of the first through hole 131 and / or the third through hole 232 is 18 mm.

[0101] In a further specific embodiment, such as Figures 1-6 As shown, the diameter of the second through hole 132 and / or the fourth through hole 231 is 4-9 mm. For example, the diameter of the second through hole 132 and / or the fourth through hole 231 can be 4-5 mm, 5-6 mm, 6-7 mm, 7-8 mm, or 8-9 mm. In a... Figures 2-6 In the specific embodiment shown, the diameter of the second through hole 132 and / or the fourth through hole 231 is 6 mm.

[0102] In a more specific embodiment, such as Figures 1-6 As shown, the top of the first fluidized bed packing filter layer 10 also protrudes upward to form a horizontally closed second filter layer support frame 14. The water-distributing filter layer 30 extends inward from the bottom of its sidewall to form a second horizontal limiting frame 34. The free end of the second horizontal limiting frame 34 abuts against the second filter layer support frame 14 to support and horizontally limit the upper water-distributing filter layer 30. The second filter layer support frame 14 matches the bottom of the water-distributing filter layer 30 and supports the water-distributing filter layer 30.

[0103] In a like Figures 1-6 In the specific embodiment shown, the height of the second filter layer support frame 14 is greater than the distance from the second horizontal limiting frame 34 to the bottom plate of the water-dividing filter layer 30. This allows air to enter the biochemical filtration device through the gap between the second horizontal limiting frame 34 and the second filter layer support frame 14. Simultaneously, the upwardly protruding second filter layer support frame 14 helps to prevent water overflow when there is excessive water in the biochemical filtration device for fish farming water.

[0104] In a more specific embodiment, such as Figures 1-6 As shown, the top of the water-dividing filter layer 30 also protrudes upward to form a horizontally closed third filter layer support frame 33, which is used to support the top cover 40. At the same time, the upwardly protruding third filter layer support frame 33 plays a certain role in preventing water overflow when there is too much water in the biochemical filtration device for fish farming water.

[0105] In one specific embodiment, the dimensions of the biochemical filtration device are (1000-1500) mm * (600-1000) mm * (450-700) mm. The (1000-1500) mm represents the length of the filtration device, the (600-1000) mm represents the width of the filtration device, and the (450-700) mm represents the height of the filtration device.

[0106] The dimensions of the biochemical filtration device described above can be (1000-1100)mm*(600-700)mm*(450-500)mm, (1100-1200)mm*(700-730)mm*(500-550)mm, (1200-1320)mm*(730-900)mm*(550-600)mm, (1320-1400)mm*(900-1000)mm*(600-650)mm, or (1400-1500)mm*(900-1000)mm*(650-700)mm. In a specific example... Figures 1-7 In the embodiment shown, the dimensions of the biochemical filtration device are 1320mm*730mm*600mm.

[0107] In a like Figures 1-8 The specific operation method of the biochemical filtration device for fish farming water includes the following steps:

[0108] 1) The fluidized bed packing 60 is filled to 90% of the tank volume of the first fluidized bed packing filter layer 10 and the second fluidized bed packing filter layer 20. The water inlet 31 is connected to an external water supply pipe, and the fish farming water is introduced into the water distribution filter layer 30 through an air pump.

[0109] 2) The water used for fish farming is diverted and preliminarily filtered through the fifth through hole 32 of the water distribution filter layer 30, and then enters the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20 in sequence, and undergoes biological filtration through the fluidized bed packing 60.

[0110] 3) The water used for fish farming is filtered through the first fluidized bed filter layer 10 and the second fluidized bed filter layer 20, flows into the effluent layer 50, and re-enters the fish farming water system through the effluent outlet 51.

[0111] 4) If the fluidized bed packing 60 needs to be replaced, the water separation filter layer 30 is disassembled, and the first bottom plate 13 and the second bottom plate 23 are lifted upward to remove the fluidized bed packing 60 in the tank for cleaning and / or replacement.

[0112] This invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0113] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A biochemical filtration device for fish farming water, characterized in that, The biochemical filtration device for fish farming water includes a multi-layer fluidized bed filter layer that is stacked and detachable; any fluidized bed filter layer includes a tank for accommodating the fluidized bed filter, and the bottom plate of the tank is detachable, with through holes formed on the bottom plate for water supply.

2. The biochemical filtration device according to claim 1, characterized in that, In any fluidized bed packing filter layer, there is also a partition plate disposed on the bottom plate for blocking the fluidized bed packing. The partition plate divides the tank into a rapid filtration zone and a slow filtration zone. The aperture of the through hole formed on the bottom plate corresponding to the rapid filtration zone is larger than the aperture of the through hole formed on the bottom plate corresponding to the slow filtration zone. And / or, a trough-shaped water separation filter layer (30) can be detachably connected above the fluidized bed packing filter layer, and the bottom of the trough of the water separation filter layer (30) has a plurality of fifth through holes (32); And / or, the bottom of the fluidized bed packing filter layer may also be detachably connected to a water outlet layer (50), the water outlet layer (50) forming a water outlet; And / or, the top of any of the fluidized bed packing filter layers also protrudes upward to form a horizontally closed filter layer support frame, and any of the fluidized bed packing filter layers extends inward from the bottom of the side wall to form a horizontal limiting frame, the free end of the horizontal limiting frame abutting against the filter layer support frame to horizontally limit the upper fluidized bed packing filter layer. And / or, the inner sidewall of any of the fluidized bed packing filter layers protrudes to form a bottom plate support structure for supporting the bottom plate. And / or, the inlet (31) of the biochemical filtration device is located near its top; And / or, the biochemical filtration device further includes a top cover (40).

3. The biochemical filtration device according to claim 2, characterized in that, At least one adjacent fluidized bed packing filter layer has its rapid filtration zone and slow filtration zone staggered in the vertical direction; And / or, the sidewall of the water separation filter layer (30) is also formed with a plurality of water inlet holes (31); And / or, a top cover (40) may be detachably connected above the water separation filter layer (30); And / or, the base plate support structure is a support ring; And / or, the top of the filter layer support frame abuts against the bottom of the base plate support structure to achieve stacking; And / or, the height of the filter layer support frame is greater than the distance between the horizontal limiting frame and the bottom plate support structure.

4. The biochemical filtration device according to claim 1, characterized in that, The fluidized bed packing filter layer includes several first fluidized bed packing filter layers (10) and second fluidized bed packing filter layers (20), and adjacent first fluidized bed packing filter layers (10) and second fluidized bed packing filter layers (20) are detachably connected. And / or, the fluidized bed filter layer is filled with fluidized bed packing (60), and the filling ratio of the fluidized bed packing (60) in the fluidized bed filter layer is 80-95%.

5. The biochemical filtration device according to claim 4, characterized in that, The first fluidized bed packing filter layer (10) includes a first base plate (13), the first base plate (13) protruding upward to form a first partition (12) that divides the first fluidized bed packing filter layer (10) into two first filtration zones; the first base plate (13) on both sides of the first partition (12) protruding upward to form a second partition (11), the second partition (11) being used to divide the first filtration zone into several alternating and fluidly connected first rapid filtration zones and first slow filtration zones; the first base plate (13) forms several first through holes (131) in the first rapid filtration zone and several second through holes (132) with a pore size smaller than the first through holes (131) in the first slow filtration zone; The second fluidized bed packing filter layer (20) includes a second base plate (23), the second base plate (23) protruding upward to form a third partition (22) that divides the second fluidized bed packing filter layer (20) into two second filtration zones; the second base plate (23) on both sides of the third partition (22) protruding upward to form a plurality of fourth partitions (21) that divide the second filtration zone into a plurality of alternately distributed and fluidly connected second fast filtration zones and second slow filtration zones; the second base plate (23) forms a plurality of third through holes (232) in the second fast filtration zone and a plurality of fourth through holes (231) with a diameter smaller than the third through holes (232) in the second slow filtration zone; in the vertical direction, at least one first slow filtration zone coincides with the second fast filtration zone, and at least one first fast filtration zone coincides with the second slow filtration zone.

6. The biochemical filtration device according to claim 5, characterized in that, The height of the first partition (12) is greater than the height of the second partition (11); And / or, the height of the third partition (22) is greater than the height of the fourth partition (21); And / or, after the first fluidized bed packing filter layer (10) and the second fluidized bed packing filter layer (20) are stacked, the distance between the second partition (11) and / or the fourth partition (21) and the bottom plate of the upper layer is less than the minimum diameter of the fluidized bed packing (60); And / or, the number of the first fluidized bed packing filter layer (10) and / or the second fluidized bed packing filter layer (20) is 1 to 5; And / or, the top of the second fluidized bed packing filter layer (20) also protrudes upward to form a first filter layer support frame (24) that is closed in the horizontal direction, and the first fluidized bed packing filter layer (10) extends inward from the bottom of the side wall to form a first horizontal limiting frame (16), and the free end of the first horizontal limiting frame (16) abuts against the first filter layer support frame (24) to limit the first fluidized bed packing filter layer (10) in the horizontal direction.

7. The biochemical filtration device according to claim 6, characterized in that, After the first fluidized bed packing filter layer (10) and the second fluidized bed packing filter layer (20) are stacked, the distance between the first partition (12) and / or the third partition (22) and the bottom plate of the upper layer is 2 to 4 cm. And / or, after the first fluidized bed packing filter layer (10) and the second fluidized bed packing filter layer (20) are stacked, the distance between the second partition (11) and / or the fourth partition (21) and the bottom plate of the upper layer is 4 to 6.5 cm.

8. The biochemical filtration device according to claim 5, characterized in that, The inner sidewall of the first fluidized bed packing filter layer (10) protrudes to form a first bottom plate support structure (15) for supporting the first bottom plate (13); And / or, the inner sidewall of the second fluidized bed packing filter layer (20) protrudes to form a second bottom plate support structure (25) for supporting the second bottom plate (23).

9. The biochemical filtration device according to claim 5, characterized in that, The ratio of the diameter of the first through hole (131) to the diameter of the second through hole (132) is (2.5~3.5):1; And / or, the ratio of the diameter of the third through hole (232) to the diameter of the fourth through hole (231) is (2.5~3.5):

1.

10. The biochemical filtration device according to claim 8, characterized in that, The diameter of the first through hole (131) and / or the third through hole (232) is 10 to 31.5 mm; And / or, the diameter of the second through hole (132) and / or the fourth through hole (231) is 4 to 9 mm.

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