Sand-dwelling aquatic animal zero-water-change recirculating aquaculture apparatus

Abstract

The utility model relates to the technical field of breeding equipment, and disclose a kind of zero water change of sand class aquatic animal circulation water aquaculture equipment, including several breeding barrels, and the multifunctional barrel is equipped in breeding barrel side, and ceramic filter layer is placed in the bottom of breeding barrel inner wall, and sand filter screen is fixed in the top of ceramic filter layer in breeding barrel inner wall, and breeding sand layer is equipped in the upper portion of sand filter screen, the device is integrated bottom water flow plowing, microfiltration separation and low oxygen denitrification triple technology by breeding barrel and multifunctional barrel, microfiltration machine is realized water efficient solid-liquid separation by screen dynamic interception mechanism, to remove larger impurities in aquaculture wastewater in physical interception mode, sponge barrel top connecting cover plate creates low oxygen environment, and internal filling biochemical sponge, after the water treated by microfiltration machine, further denitrification reaction occurs, reach the water quality purifying effect, and oxygen and water are efficiently mixed by gas-liquid rotation mixing and gradient dissolution mechanism of dissolving oxygen device, so that oxygen-rich water enters breeding barrel.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture equipment technology, specifically to a zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals. Background Technology

[0002] Sand-dwelling aquatic animals refer to aquatic organisms that dig burrows in sandy or muddy bottoms to bury themselves or build habitats. They are widely distributed in marine and freshwater environments. Based on their classification and ecological habits, they can be mainly divided into the following phyla: Bivalvia (such as clams and mud clams); Cephalopoda (such as octopuses); Polychaeta (such as Polychaeta); Crustacea (such as the Chinese sand crab); Echinodermata; and fish (such as freshwater benthic fish). Sand-dwelling aquatic animals depend on the bottom environment for survival, and their living habits are closely related to the challenges of aquaculture.

[0003] From an ecological perspective, sand-dwelling aquatic animals mainly inhabit muddy, gravelly, or soft mud bottoms, using the substrate to construct burrows for hiding from predators, ambush prey, or filter feeding. Some sand-dwelling aquatic animals also exhibit unique behavioral patterns. Intensive aquaculture, through precise environmental control and resource optimization, has completely overturned the traditional growth patterns of sand-dwelling aquatic animals. It can transform uncontrollable natural variables into programmable production factors. In artificial systems, the growth cycle of farmed animals is shortened, and the yield per unit water volume jumps to 12 times that of natural mudflats. Through dynamic temperature control (±0.5℃), the trigger rate of reproductive behavior is greatly increased, completely breaking the species' dependence on the natural environment. Ultimately, this achieves a triple leap in resource utilization, production stability, and ecological sustainability. The promotion of intensive aquaculture also signifies that the aquaculture industry has officially shifted from "relying on the weather" to an industrialized era of "production on demand."

[0004] In traditional aquaculture, uneaten feed and feces accumulate in the aquaculture sand layer. Over time, this accumulation leads to sand compaction and water quality deterioration, which in turn affects the living environment of the farmed organisms. Furthermore, solid impurities and dissolved pollutants in the aquaculture wastewater are difficult to remove effectively. Therefore, a zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals, comprising several aquaculture tanks, a multi-functional tank on one side of each aquaculture tank, a ceramic filter layer placed at the bottom of the inner wall of each aquaculture tank, a sand-proof filter screen fixed on top of the ceramic filter layer on the inner wall of each aquaculture tank, and an aquaculture sand layer at the top of the sand-proof filter screen, the aquaculture sand layer being used for sand-dwelling aquatic animals.

[0007] A support frame is fixed to one side of the multi-functional tank, a microfilter is fixed to the top of the support frame, and a first connecting pipe is connected to the bottom of the microfilter;

[0008] A sponge bucket is fixed to one side of the top of the inner wall of the multi-functional bucket. A cover plate is connected to the top of the sponge bucket, and a water-dividing plate is connected to the bottom of the cover plate. An oxygenator is installed inside the multi-functional bucket.

[0009] The upper inner side of the breeding tank is connected to a drain pipe, and a water pump for circulating the breeding water is installed on the drain pipe.

[0010] Preferably, the drain pipe has a filter screen fixed at its inlet end, the drain pipe has an outlet end connected to the inlet end of the microfilter, and the outlet end of the first connecting pipe is located at the top of the water distribution plate.

[0011] Preferably, the bottom of the breeding tank is connected to a first water inlet pipe, the inlet end of the first water inlet pipe is connected to a second water inlet pipe, and the inlet end of the second water inlet pipe is connected to the multi-functional tank.

[0012] Preferably, a water level switch is installed on one side of the inner wall of the multi-functional bucket, and the water level switch is used to detect the water level inside the multi-functional bucket.

[0013] Preferably, the multi-functional tank is connected to a second connecting pipe on one side, which is used to connect to an air source water heater. A controller is provided on one side of the multi-functional tank, and the output terminal of the controller is electrically connected to the input terminal of the water pump and the water level switch.

[0014] Preferably, the thickness of the aquaculture sand layer is 2 cm to 55 cm.

[0015] Preferably, the diameter of the sand in the aquaculture sand layer is 0.1 mm to 0.3 mm.

[0016] Preferably, the thickness of the ceramic filter layer is 30 cm to 50 cm.

[0017] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0018] This device integrates bottom water flow tillage, microfiltration separation, and low-oxygen denitrification technologies through an aquaculture tank and a multi-functional tank. The microfilter achieves efficient solid-liquid separation of water through a dynamic screen interception mechanism, physically removing larger impurities from aquaculture wastewater. The sponge tank, with a cover plate at the top, creates a low-oxygen environment and is filled with biochemical sponges. After the water treated by the microfilter enters, a further denitrification reaction occurs, purifying the water. The oxygenator achieves efficient mixing of oxygen and water through gas-liquid swirling and gradient dissolution mechanisms, allowing oxygen-enriched water to enter the aquaculture tank. This eliminates the labor costs of traditional sand removal, significantly reducing the cost of aquaculture wastewater treatment. It enables closed-loop operation of the aquaculture system, reducing nitrogen and phosphorus pollution of natural water bodies by aquaculture wastewater, promoting the green development of aquaculture. The aquaculture water body automatically tills the sand layer, allowing uneaten feed and feces to be physically separated with the water flow. In the low-oxygen environment, denitrification is promoted to remove ammonia nitrogen, achieving dual purification of water quality. This solves the traditional sand removal problem, improves aquaculture water quality, provides a better living environment for aquaculture organisms, and increases aquaculture yield and quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first-view structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the third-view structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the filter screen structure of this utility model.

[0025] Explanation of reference numerals in the attached diagram: 1. Breeding tank; 2. Multifunctional tank; 3. First water inlet pipe; 4. Support frame; 5. First connecting pipe; 6. Ceramic filter layer; 7. Sand-proof filter screen; 8. Breeding sand layer; 9. Filter screen; 10. Drainage pipe; 11. Water pump; 12. Microfilter; 13. Water distribution plate; 14. Cover plate; 15. Sponge tank; 16. Water level switch; 17. Oxygenator; 18. Second connecting pipe; 19. Second water inlet pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce. Example

[0028] Please see Figure 1-5 This utility model provides a technical solution: a zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals, comprising several aquaculture tanks 1, with a multi-functional tank 2 on one side of each tank 1. The multi-functional tank 2 has multiple functions such as denitrification, water storage, and oxygenation. A ceramic filter layer 6 is placed at the bottom of the inner wall of the aquaculture tank 1. The ceramic filter layer 6 is composed of ceramic particles with different diameters, ranging from 1cm to 5cm. The ceramic particles are evenly distributed, and the micropore diameter of the ceramic particles is 2-50nm, which facilitates the diffusion of bacterial metabolites. Other filter materials can also be used for the ceramic filter layer 6, such as coral skeletons, bio-balls, volcanic rock, etc.

[0029] The inner wall of the breeding tank 1 is fixed with a sand-proof filter 7 located on top of the ceramic filter layer 6. The filter mesh size of the sand-proof filter 7 is smaller than the smallest particle size of the breeding sand in the breeding sand layer 8. The breeding sand layer 8 is located above the sand-proof filter 7. The breeding sand layer 8 is used for the breeding of aquatic animals lying on the sand; the aquatic animals complete the breeding process in the breeding sand layer 8 by lying on the sand, etc.

[0030] A support frame 4 is fixed to one side of the multi-functional tank 2, and a microfilter 12 is fixed to the top of the support frame 4. The microfilter 12 is preferably an ultrafiltration machine with a filtration density of 600-800 mesh. In seawater aquaculture, the microfilter 12 is preferably a microfilter with an independent spray system. The microfilter 12 achieves efficient solid-liquid separation of water through a dynamic screen interception mechanism. Its core function is to remove 20-100μm suspended particles by physical interception. The water to be treated is evenly distributed to the surface of the rotating drum screen through the inlet channel, while the suspended solids are trapped on the inner wall of the screen. The high-pressure spray system at the top washes the screen with a fan-shaped water curtain, flushing the trapped dirt into the drain tank to achieve continuous self-cleaning and reduce the suspended solids in the effluent. The concentration is reduced to ≤5mg / L, and the turbidity is reduced by more than 90%, providing pre-protection for subsequent water treatment. The water treated by the microfilter 12 passes through the sponge tank 15 and then through the oxygenator 17. Through the gas-liquid vortex mixing-gradient dissolution mechanism, oxygen and water are efficiently mixed, allowing the oxygen-enriched water to enter the aquaculture tank 1. It then flows into the aquaculture tank 1 through the first water inlet pipe 3 and the second water inlet pipe 19. Ultra-efficient oxygenation directly injects pure oxygen, with an oxygenation efficiency of over 90%. This eliminates the labor costs of traditional sand cleaning, significantly reduces the cost of aquaculture wastewater treatment, enables closed-loop operation of the aquaculture system, reduces nitrogen and phosphorus pollution of natural water bodies by aquaculture wastewater, promotes the green development of aquaculture, and makes it more intelligent and safe.

[0031] The bottom of the microfilter 12 is connected to a first connecting pipe 5, and the bottom of the cover plate 14 is connected to a water distribution plate 13. The first connecting pipe 5 is the water outlet pipe of the microfilter 12, and the water distribution plate 13 is located at the water outlet of the first connecting pipe 5 to reduce the contact area between water and air in the microfilter 12 and to distribute the water flow into the sponge tank 15 to ensure uniform entry into the subsequent flow.

[0032] A sponge bucket 15 is fixed to one side of the top of the inner wall of the multi-functional bucket 2. A cover plate 14 is connected to the top of the sponge bucket 15. The cover plate 14 is set above the sponge bucket 15 and is an openable cover plate used to create a low-oxygen environment for the sponge bucket 15. The sponge bucket 15 is filled with biochemical sponges downstream of the microfilter 12 for further filtration and purification of water quality. In the low-oxygen environment, the water treated by the microfilter 12 undergoes further denitrification reaction to achieve water purification. An oxygenator 17 is set inside the multi-functional bucket 2. The oxygenator 17 is a submersible oxygenator. The oxygenator 17 is equipped with a submersible pump. The outlet of the submersible pump is connected to the inlet of the second inlet pipe 19. The flow rate of the submersible pump in the oxygenator 17 is 0.5-1 times the total water volume of the system. Seawater is periodically pumped through the submersible pump in the oxygenator 17 to realize the turning of sand in the aquaculture sand layer 8.

[0033] The oxygenator 17 is hung on the inner wall of the multi-functional tank 2 and is submerged in water. The oxygenator 17 is cylindrical in shape and has a water inlet grid on the outer side of the bottom. Water from inside the multi-functional tank 2 enters the inside of the oxygenator 17. At the same time, an air inlet pipe is connected to the top of the oxygenator 17 and a pure oxygen inlet pipe. The submersible pump inside the oxygenator 17 pumps the water from inside the multi-functional tank 2 out and mixes it with oxygen. The mixed water is then pumped to the inside of the second water inlet pipe 19.

[0034] The upper inner side of the breeding tank 1 is connected to a drain pipe 10, and a water pump 11 for circulating breeding water is installed on the drain pipe 10. The power of the water pump 11 is twice that of the submersible pump in the oxygenator 17. Wastewater is pumped into the microfilter 12 for primary filtration through the drain pipe 10 under the pumping force of the water pump 11. The water flows to the sponge tank 15, which is sealed in the cover plate 14. The sponge tank 15 is in a low-oxygen environment for denitrification. Beneficial bacteria are added to the sponge tank 15 during denitrification. After the purified water is oxygenated by the oxygenator 17, it is pumped back to the breeding tank 1 through the second water inlet pipe 19.

[0035] A filter screen 9 is fixed at the inlet end of the drain pipe 10. The mesh size of the filter screen 9 is smaller than the diameter of the sand. The outlet end of the drain pipe 10 is connected to the inlet end of the microfilter 12. The outlet end of the first connecting pipe 5 is located inside the sponge bucket 15. The bottom of the breeding bucket 1 is connected to the first inlet pipe 3. The inlet end of the first inlet pipe 3 is connected to the second inlet pipe 19. The inlet end of the second inlet pipe 19 is connected to the multi-functional bucket 2.

[0036] A water level switch 16 is installed on one side of the inner wall of the multi-functional tank 2. The water level switch 16 is used to detect the water level inside the multi-functional tank 2. When the maximum water level is reached, the controller controls the valve to close and stop water from entering the breeding tank 1. When the minimum water level is reached, the valve opens to start the input of the breeding circulating water. A second connecting pipe 18 is connected to one side of the multi-functional tank 2. The second connecting pipe 18 is used to connect to the air source water heater. The second connecting pipe 18 connected to the air source water heater passes through the multi-functional tank 2. It is used to connect to the external air source water heater to realize water temperature regulation. There are two second connecting pipes 18. One inlet pipe introduces hot water and the other outlet pipe discharges cold water to realize controllable water temperature. A controller is set on one side of the multi-functional tank 2. The output terminal of the controller is electrically connected to the input terminal of the water pump 11 and the water level switch 16. The water level switch 16 detects the water level inside the multi-functional tank 2. When the water level drops, the controller controls the external water pipe to add water into the multi-functional tank 2.

[0037] The thickness of the aquaculture sand layer 8 is 2 cm to 55 cm, the diameter of the sand in the aquaculture sand layer 8 is 0.1 mm to 0.3 mm, and the thickness of the ceramic filter layer 6 is 30 cm to 50 cm.

[0038] In this embodiment, the controller is model CPM253, which includes a water level monitoring module, a water pump frequency regulation module, and a temperature control module. Since the structure and operating principle of this controller are existing technologies, their details will not be elaborated here.

[0039] Working Principle: Pump 11 is started to pump wastewater from the aquaculture tank 1 through drain pipe 10. Filter screen 9 performs preliminary filtration of the wastewater, preventing larger impurities and aquaculture sand from entering subsequent equipment. The outlet of drain pipe 10 is connected to the inlet of microfilter 12, and the wastewater is pumped into microfilter 12 for primary filtration. Microfilter 12 achieves efficient solid-liquid separation of water through a dynamic screen interception mechanism, removing 20-100μm suspended particles through physical interception. The water to be treated is evenly distributed to the surface of the rotating drum screen through the inlet channel. Suspended solids are trapped on the inner wall of the screen. The top high-pressure spray system washes the screen with a fan-shaped water curtain, flushing the trapped contaminants into the drain tank, achieving continuous self-cleaning and providing pre-protection for subsequent water treatment. The bottom of the cover plate 14 is connected to a water distribution plate 13, which is located at the water outlet of the first connecting pipe 5 and is used to distribute the water flow to ensure that it enters the subsequent equipment evenly. The height of the sponge bucket 15 is not lower than the upper edge of the breeding bucket 1, and the installation height of the water level switch 16 is 10 cm to 20 cm below the upper edge of the breeding bucket 1.

[0040] Water flows to the sponge tank 15, and the top of the sponge tank 15 is connected to the cover plate 14. The cover plate 14 creates a low-oxygen environment for the sponge tank 15. The sponge tank 15 is filled with biochemical sponges downstream of the microfilter 12 for further filtration and purification of water. In the low-oxygen environment, the water treated by the microfilter 12 undergoes further denitrification, achieving the effect of purifying water quality.

[0041] The submersible pump in the oxygenator 17 has a flow rate of 0.5-1 times the total water volume of the system per hour. After being purified by the sponge tank 15, the water enters the oxygenator 17. Through the gas-liquid swirling and gradient dissolution mechanism, oxygen and water are efficiently mixed, allowing the oxygen-enriched water to enter the aquaculture tank 1.

[0042] The bottom of the breeding tank 1 is connected to the first water inlet pipe 3, and the inlet end of the first water inlet pipe 3 is connected to the second water inlet pipe 19. The inlet end of the second water inlet pipe 19 is connected to the multi-functional tank 2. The oxygenated water flows back to the breeding tank 1 through the second water inlet pipe 19 and the first water inlet pipe 3, realizing the recycling of breeding water.

[0043] A water level switch 16 is installed on one side of the inner wall of the multi-functional tank 2. The water level switch 16 is used to detect the water level inside the multi-functional tank 2. When the maximum water level is reached, the controller controls the valve to close and stop water from entering the breeding tank 1. When the minimum water level is reached, the valve opens to start the input of the breeding circulating water. A second connecting pipe 18 is connected to one side of the multi-functional tank 2. The second connecting pipe 18 is used to connect to the air source water heater. The second connecting pipe 18 for connecting to the air source water heater passes through the multi-functional tank 2. By connecting to the external air source water heater, water temperature regulation can be achieved; hot water is introduced through the inlet pipe, and cold water is discharged through the outlet pipe, so the water temperature can be controlled.

[0044] In summary, this device integrates bottom water flow tillage, microfiltration separation, and low-oxygen denitrification technologies through the aquaculture tank 1 and the multi-functional tank 2. The microfilter 12 achieves efficient solid-liquid separation of water through a dynamic screen interception mechanism, removing larger impurities in the aquaculture wastewater through physical interception. The sponge tank 15, with a cover plate 14 at the top, creates a low-oxygen environment and is filled with biochemical sponges. After the water treated by the microfilter 12 enters, a further denitrification reaction occurs, achieving water purification. The oxygenator 17 achieves oxygen and water dissolution through a gas-liquid vortex mixing and gradient dissolution mechanism. The efficient mixing process allows oxygen-rich water to enter the aquaculture tank 1, eliminating the labor costs of traditional sand removal and significantly reducing the cost of aquaculture wastewater treatment. It enables closed-loop operation of the aquaculture system, reduces nitrogen and phosphorus pollution of natural water bodies by aquaculture wastewater, promotes the green development of aquaculture, and achieves automatic sand layer turning in the aquaculture water body. After the residual feed and feces are physically separated with the water flow, denitrification is promoted in the low-oxygen environment to remove ammonia nitrogen, achieving dual purification of water quality. This solves the traditional sand removal problem, improves the quality of aquaculture water, provides a better living environment for aquaculture organisms, and increases aquaculture yield and quality.

[0045] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.

Claims

1. A zero-water exchange recirculating aquaculture system for benthic aquatic animals, comprising a plurality of culture tanks (1), characterized in that, The breeding tank (1) is provided with a multi-functional tank (2) on one side. A ceramic filter layer (6) is placed at the bottom of the inner wall of the breeding tank (1). A sand-proof filter (7) is fixed on the inner wall of the breeding tank (1) at the top of the ceramic filter layer (6). A breeding sand layer (8) is provided on the upper part of the sand-proof filter (7). The breeding sand layer (8) is used for aquatic animal sand-laying breeding. The multi-functional bucket (2) is fixed with a support frame (4) on one side, and a microfilter (12) is fixed on the top of the support frame (4). The bottom of the microfilter (12) is connected to a first connecting pipe (5). A sponge bucket (15) is fixed to one side of the top of the inner wall of the multi-functional bucket (2). A cover plate (14) is connected to the top of the sponge bucket (15). A water distribution plate (13) is connected to the bottom of the cover plate (14). An oxygenator (17) is installed inside the multi-functional bucket (2). The upper inner side of the breeding tank (1) is connected to a drain pipe (10), and a water pump (11) for circulating breeding water is installed on the drain pipe (10).

2. The recirculating aquaculture system of claim 1, wherein the recirculating aquaculture system is a recirculating aquaculture system for sand-dwelling aquatic animals, and wherein the recirculating aquaculture system further comprises a sand filter. The inlet end of the drain pipe (10) is fixed with a filter screen (9), the outlet end of the drain pipe (10) is connected to the inlet end of the microfilter (12), and the outlet end of the first connecting pipe (5) is located at the top of the water distribution plate (13).

3. The recirculating aquaculture system of claim 1, wherein the recirculating aquaculture system is a zero-water exchange recirculating aquaculture system for sand-dwelling aquatic animals. The bottom of the breeding tank (1) is connected to a first water inlet pipe (3), the water inlet end of the first water inlet pipe (3) is connected to a second water inlet pipe (19), and the water inlet end of the second water inlet pipe (19) is connected to the multi-functional tank (2).

4. The recirculating aquaculture system of claim 3, wherein the recirculating aquaculture system further comprises a sand filter. A water level switch (16) is installed on one side of the inner wall of the multi-functional bucket (2), and the water level switch (16) is used to detect the water level inside the multi-functional bucket (2).

5. The recirculating aquaculture system of claim 4, wherein the recirculating aquaculture system further comprises a sand filter. The multi-functional tank (2) is connected to a second connecting pipe (18) on one side. The second connecting pipe (18) is used to connect to an air source water heater. The multi-functional tank (2) is equipped with a controller on one side. The output end of the controller is electrically connected to the input end of the water pump (11) and the water level switch (16).

6. The zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals according to claim 1, characterized in that, The thickness of the aquaculture sand layer (8) is 2 cm to 55 cm.

7. The zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals according to claim 1, characterized in that, The sand in the aquaculture sand layer (8) has a diameter of 0.1 mm to 0.3 mm.

8. The zero-water-change recirculating aquaculture system for sand-dwelling aquatic animals according to claim 1, characterized in that, The thickness of the ceramic filter layer (6) is 30 cm to 50 cm.

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