Tidal type facility fish farming system

Abstract

The utility model discloses a kind of tidal facility fishery breeding systems, tidal facility fishery breeding system requires single group modular circulating water design, every group of breeding water body ≦100 cubic, configure an independent tidal circulating water treatment system, and it can be stacked according to single group module in large scale, and each group of module includes breeding box, solid-liquid separator (high purification), nitrification system and water storage tank;It also includes oxygen supply aeration system;pH value, water level, water temperature and dissolved oxygen content in breeding water body are detected using sensor;Under the control of controller, breeding box uses tidal water circulation mode to realize water intake and drainage;Tidal circulating mode refers to the mode that micro-flow drainage mode and rapid water replenishment mode are combined, and the present scheme can realize the purpose of energy saving, water saving effect, and cost reduction and efficiency improvement.

Description

Technical Field

[0001] This utility model relates to a tidal aquaculture system. Background Technology

[0002] In recent years, facility-based fisheries technology has made great strides and is becoming increasingly mature.

[0003] For example, Chinese Patent Publication No. 1981574A discloses a process for a recirculating water industrialized aquaculture system. This system includes a closed-loop water treatment system. The aquaculture water flows from the aquaculture pond through a drum-type solid-liquid separator to remove suspended particles larger than 60 μm. It then passes through a flowing purification channel to remove some suspended particles smaller than 60 μm and some NH4-N and NO2-N, before being introduced into a collection tank. A primary pump draws the aquaculture water from the collection tank to an aerated biological filter and a float-type biological filter to remove most of the NH4-N, NO2-N, and COD. The water then bypasses a foam separation-ozone disinfection device to reduce COD and suspended particles smaller than 30 μm, while also disinfecting and oxygenating the water. After adjusting the pH and temperature in a mixing tank, the water is finally disinfected by an ultraviolet disinfection device before entering the aquaculture pond. This invention is applicable to ultra-high-density intensive aquaculture.

[0004] For example, Chinese Patent Publication No. 206238115U discloses an aquaculture system, including: a box; the box includes multiple spaced partitions that divide the box into multiple aquaculture ponds, with the volume of at least two ponds increasing sequentially according to the growth stage of the aquatic products. This utility model's aquaculture system, based on a box design, achieves graded aquaculture (i.e., "small ponds for raising fry, large ponds for growing fish, and simultaneous cultivation") through a rational spatial layout, while also enabling high-density aquaculture with high water space utilization. The entire system is also easy to move and transport. It has advantages such as miniaturization and modularity.

[0005] While the above solutions can achieve recirculating aquaculture, they still have many problems such as poor water quality control, large water exchange volume, and high energy consumption.

[0006] Therefore, it is necessary to design a new facility-based aquaculture system and method. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a tidal aquaculture system with a compact structure and rich functions.

[0008] The technical solution of the utility model is as follows: A tidal aquaculture system includes a culture tank and a tidal recirculating water treatment system; the tidal recirculating water treatment system includes a solid-liquid separator, a nitrification system, a water storage tank, and an oxygen supply and aeration system. The oxygen supply and aeration system provides oxygen to the breeding tanks and nitrification system; The inlet of the breeding tank is connected to the water storage tank via a circulation pump and pipeline; the outlet of the breeding tank is connected to the inlet of the nitrification system via a solid-liquid separator. It also includes a controller and sensors installed inside the aquaculture tank; the controller is connected to the sensors, which are used to detect the pH value, water level, water temperature and dissolved oxygen content in the aquaculture water; the circulation pump is controlled by the controller. Under the control of the controller, the breeding tank adopts a tidal circulation method to realize water inlet and outlet; Tidal circulation mode refers to a mode that combines micro-flow drainage mode and rapid water replenishment mode; Under normal circumstances, micro-flow drainage mode is used; When the water level drops to the preset water replenishment level, rapid water replenishment is started again until the water level reaches the preset normal level; the process maintains a micro-flow slow drainage mode to achieve uninterrupted drainage (24 hours); the preset water replenishment level is lower than the preset normal level.

[0009] It adopts a modular design; the volume of each aquaculture water body is ≤100 cubic meters; each aquaculture water body is equipped with an independent tidal circulating water treatment system.

[0010] It adopts a single-unit modular circulating water design, with each group of aquaculture water bodies equipped with an independent tidal circulating water treatment system. If large-scale development is required, it can be achieved by stacking single units of modules.

[0011] It also includes an ozone generator, and the effluent from the nitrification system is treated by the ozone generator before entering the storage tank.

[0012] It also includes a fermentation system; the residue outlet of the solid-liquid separator is connected to the fermentation system. After fermentation, the residue is used as organic nitrogen fertilizer in agriculture, for irrigating vegetable fields and orchards, and for feeding silver carp and bighead carp.

[0013] The solid-liquid separator is a vertical flow sand filter device.

[0014] The preset water replenishment level is 65-80% of the preset normal water level.

[0015] The flow rate in drainage mode is 0.15-0.5 cubic meters per minute, and the flow rate in water replenishment mode is 0.5-1.5 cubic meters per minute.

[0016] It also includes an ecological treatment system, through which the effluent from the nitrification system flows before entering the storage tank.

[0017] The ecological treatment system is an aquaponics system.

[0018] Beneficial Effects: This utility model's tidal aquaculture system is characterized by a "tidal" circulation mode. This involves continuously draining the aquaculture water and rapidly replenishing it when the water level drops to a certain point, creating a "tidal" circulation within the aquaculture tank. Currently, it achieves a daily water exchange of less than 5m³ per tank (25m³), with a water exchange rate of less than 20%. The tidal flow aquaculture mode combines micro-flow drainage and rapid water replenishment, and can be applied to all aquaculture scenarios, including ponds, cylindrical tanks, flowing water tanks, and factory-style systems. This tidal aquaculture system facilitates rapid and efficient wastewater discharge and cleaning, reducing uneaten feed, feces, turbidity, and suspended solids in the aquaculture water, and lowering ammonia nitrogen and nitrite levels. It also significantly reduces the area and pressure of the nitrification system, achieving energy and water conservation, and ultimately reducing costs and increasing efficiency in aquaculture. Furthermore, tidal aquaculture systems are suitable for high-density aquaculture. The flowing water aquaculture promotes the rational movement of farmed fish, reduces the fat and water content of fish meat, improves the taste and flavor of the meat, and enhances the quality and economic benefits of aquaculture.

[0019] Advantages: 1. Energy saving: The circulating pump does not need to be started 24 hours a day; it only needs to be started for 5-10 minutes every hour, effectively saving electricity. 2. Clean water: Each cycle can exchange 20-30% of the water volume, effectively reducing the amount of suspended solids in the breeding tank and achieving a clean water effect; 3. Sewage discharge: Lowering the water level in the tank facilitates the timely discharge of deep sewage from the bottom layer, effectively improving the sewage discharge efficiency; 4. Modular design: The modular design allows for independent water channels and controls between modules, enhancing biosafety and facilitating flexible control. In summary, the tidal aquaculture system of this invention has a high degree of integration, rich functions, and saves energy, making it suitable for widespread implementation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the integrated water storage tank (with water present).

[0021] Figure 2 This is a schematic diagram of the overall structure of the integrated water storage tank (state diagram when there is no water).

[0022] Figure 3 This is a general diagram of a tidal aquaculture system.

[0023] Figure 4 This is a schematic diagram of a tidal flow aquaculture model.

[0024] Figure 5This is a schematic diagram (front view) of the overall structure of the vertical flow sand filter device.

[0025] Figure 6 This is a schematic diagram (top view) of the overall structure of the vertical flow sand filter device.

[0026] Figure 7 This is a schematic diagram of the wastewater treatment process of a wastewater treatment device based on a vertical flow sand filter.

[0027] Figure 8 This is a 3D view of a sand filter barrel.

[0028] Labeling Explanation: 1-Sewage pipe, 2-Sewage valve, 3-Grate plate, 4-Nitrification ball, 5-Spray pipe, 6-Inlet pipe, 7-Nitrification zone, 8-Water storage zone, 9-First liquid level, 10-Second permeable inlet, 11-Pumping pipe, 12-Disinfection zone, 13-Ozone pipe, 14-Submersible pump, 15-Ceramic disc, 16-UV tube, 17-Bottom drain pipe, 18-First cone bottom, 19-First permeable inlet, 20-Second cone bottom, 21-Water guiding channel; 22-First baffle, 23-Second baffle 24-Third partition, 25-Aeration disc, 26-Aeration pipe, 101-Vertical section of inlet pipe, 102-Handle, 103-Sand filter bucket, 104-Partition, 105-Brush column, 106-Sand filter bag, 107-Filtration zone, 108-Frame plate, 109-Central pipe, 110-Inclined plate filter, 112-Conical bottom, 113-Drain outlet, 114-Horizontal section of inlet pipe, 115-Outer bucket, 116-Overflow pipe, 117-Overflow zone, 118-Isolation cylinder, 119-Ring body. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1

[0030] like Figure 3-4 A tidal aquaculture system, characterized in that it includes a culture tank and a tidal recirculating water treatment system; the tidal recirculating water treatment system includes a solid-liquid separator, a nitrification system, a water storage tank, and an oxygen supply and aeration system. The oxygen supply and aeration system provides oxygen to the breeding tanks and nitrification system; the nitrification system uses an immersion biological filter canister (employing nitrification and denitrification processes). The inlet of the breeding tank is connected to the water storage tank via a circulation pump and pipeline; the outlet of the breeding tank is connected to the inlet of the nitrification system via a solid-liquid separator. It also includes a controller and sensors installed inside the aquaculture tank; the controller is connected to the sensors, which are used to detect the pH value, water level, water temperature and dissolved oxygen content in the aquaculture water; the circulation pump is controlled by the controller. Under the control of the controller, the breeding tank adopts a tidal circulation method to realize water inlet and outlet; Tidal flow circulation mode refers to a mode that combines micro-flow drainage mode and water replenishment mode; Under normal circumstances, micro-flow drainage mode is used; When the water level drops to the preset replenishment level, rapid water replenishment is initiated until the water level reaches the preset normal level. The entire process maintains a slow, gentle flow drainage mode, ensuring uninterrupted 24-hour operation. The preset replenishment level is lower than the preset normal level. The slow, gentle flow drainage mode is also known as the micro-flow drainage mode, and the rapid replenishment mode is also known as the rapid replenishment mode.

[0031] It adopts a modular design; the volume of each aquaculture water body is ≤100 cubic meters; each aquaculture water body is equipped with an independent tidal circulating water treatment system.

[0032] It adopts a single-unit modular circulating water design, with each group of aquaculture water bodies equipped with an independent tidal circulating water treatment system. If large-scale development is required, it can be achieved by stacking single units of modules.

[0033] The inlet of the breeding tank is connected to the water storage tank via a circulation pump and pipeline; the outlet of the breeding tank is connected to the inlet of the nitrification system via a solid-liquid separator. It also includes a controller and sensors installed inside the aquaculture tank; the controller is connected to the sensors, which are used to detect the pH value, water level, water temperature and dissolved oxygen content in the aquaculture water; the circulation pump is controlled by the controller. Under the control of the controller, the breeding tank adopts a tidal water circulation method to realize water inlet and outlet; Tidal flow circulation mode refers to a mode that combines micro-flow drainage mode and water replenishment mode; Under normal circumstances, micro-flow drainage mode is used; When the water level drops to the preset water replenishment level, rapid water replenishment is started again until the water level is replenished to the preset normal level; the process maintains a micro-flow slow drainage mode to achieve uninterrupted water circulation (24 hours); The preset water replenishment level is lower than the preset normal water level. The micro-flow drainage mode is also known as the micro-flow slow drainage mode, and the water replenishment mode is also known as the rapid water replenishment mode.

[0034] The system also includes an ozone generator. The effluent from the nitrification system is treated by the ozone generator before entering the storage tank, where ozone disinfection can also be achieved.

[0035] The system also includes a fermentation system; the residue outlet of the solid-liquid separator is connected to the fermentation system. After fermentation, the residue is used as organic nitrogen fertilizer for planting, for irrigating vegetable fields and orchards, and for feeding silver carp and bighead carp.

[0036] The solid-liquid separator is a vertical flow sand filter device (or a solid-liquid separator can be used instead).

[0037] The preset water replenishment level is 70% of the preset normal water level.

[0038] The flow rate in drainage mode is 0.2 cubic meters per minute, and the flow rate in water replenishment mode is 1.35 cubic meters per minute.

[0039] It also includes an ecological treatment system, through which the effluent from the nitrification system flows before entering the storage tank.

[0040] The ecological treatment system is an aquaponics system.

[0041] The innovation of this utility model is that the tidal water inlet and outlet achieves rapid water exchange in the breeding tank by raising and lowering the water level. Each 20-30% water exchange can remove ≥20-30% of the residue, which timely removes the residue, feces and suspended matter from the breeding water, reduces the content of ammonia nitrogen and nitrite in the breeding water, and increases the self-purification capacity of the water.

[0042] A micro-flowing water environment is conducive to fish growth, and tidal water intake and drainage greatly reduces the operating time of the circulation pump (5-10 minutes of startup per hour), which is beneficial to the operation of the circulation pump and achieves the goal of energy saving and consumption reduction.

[0043] The breeding tank is a tidal canvas breeding tank (pond) with a sludge collection layer (i.e., a cone bottom), which can better settle residual feces and organic matter. Through tidal drainage, impurities in the breeding water are discharged to a greater extent, maintaining the cleanliness of the breeding water, reducing the content of ammonia nitrogen and nitrite, promoting the rapid growth of farmed fish, reducing the feed conversion ratio, and achieving the goal of reducing breeding costs.

[0044] The system uses ultra-clean filtration through a vertical flow sand filter to promptly remove more than 90% of residual feed, feces, and other organic matter, reducing the production of ammonia nitrogen and nitrite, and lowering the biochemical pressure on the nitrification system.

[0045] Immersive biological filter canisters can force the effluent to fully contact the nitrification packing material to achieve saturated nitrification. Through isolation and sedimentation, organic matter and nitrification residues are discharged from the system in a timely manner, effectively reducing the content of ammonia nitrogen and nitrite, and greatly reducing the configuration requirements of the nitrification system. The volume of the nitrification configuration can be reduced to less than 10% of the aquaculture water volume.

[0046] 6. The integrated nitrification and disinfection storage tank helps extend the nitrification time of the tailwater, ensuring a 24-hour reduction in ammonia nitrogen and nitrite content in the storage tank water. Ozone disinfection adopts negative pressure aeration, which can make full use of the disinfection effect of ozone to effectively kill bacteria, viruses and parasites in the water, prevent the occurrence of diseases in aquaculture water, and the oxygen decomposed by ozone disinfection can also be fully integrated into the aquaculture water, promoting the conversion of ammonia nitrogen and nitrite.

[0047] The water storage tank of this utility model is an integrated water storage tank, which integrates nitrification and disinfection functions into one unit. The specific structure is described as follows: like Figure 1An integrated water storage tank, the tank body is divided into 3 areas by a first partition 22 and a second partition 23: a nitrification zone 7, a water storage zone 8 and a disinfection zone 12, the water storage zone being located between the nitrification zone and the disinfection zone; The bottom of the first partition is provided with a first water inlet 19 for connecting the bottom of the nitrification zone and the bottom of the water storage zone; The bottom of the second partition is provided with a second water inlet 10 for connecting the bottom of the water storage area and the bottom of the disinfection area; The bottom of the water storage area is provided with a first conical bottom 18; the bottommost end of the first conical bottom is connected to the bottom drain pipe 17; The nitrification zone is equipped with a grid plate 3 and multiple nitrifying balls 4 mounted on the grid plate. The bottom of the nitrification zone is a second cone bottom 20. The bottom of the second cone bottom is connected to a drain pipe 1 with a drain valve 2. The nitrifying balls are generally higher than the liquid level to achieve better filtration. Nitrifying balls can be replaced with packing materials such as K3. Multiple nitrifying balls are placed in the water body above the grid plate. An aeration disc 25 and an aeration pipe 26 connected to the aeration disc are located in the area between the grid plate and the second cone bottom. The aeration pipe and aeration disc can also be placed above the grid plate. The nitrifying balls provide a carrier for nitrifying bacteria, while the aeration pipe and aeration disc provide sufficient oxygen. During the reproduction of nitrifying bacteria, ammonia nitrogen, COD, and nitrite levels in the water body can be significantly reduced.

[0048] The bottom of the disinfection zone is equipped with a ceramic disc 15 for aeration connected to an ozone pipe; a submersible pump 14 is also installed in the disinfection zone; the submersible pump and the water pumping pipe connected to the submersible pump are used to pump water from the disinfection zone into an external aquaculture pond. A spray pipe 5 is fixed at the top of the nitrification zone.

[0049] Both the first and second conical bottoms are used for collecting sludge. The bottom drain pipe is equipped with a bottom drain valve, which is not shown in the figure.

[0050] The third partition 24 within the disinfection zone divides the zone into two independent areas: an ozone disinfection zone and a water pumping zone. A water guiding channel 21 is installed within the disinfection zone, with one end connecting to the second water inlet and the other end connecting to the bottom of the disinfection zone. Water disinfected by ozone enters the water pumping zone by passing over the wall (i.e., over the third partition).

[0051] An ultraviolet tube 16 is also installed in the pumping area. The ultraviolet tube is fixed on the side of the pumping area.

[0052] The grating can be an inclined plate (or a flat plate, i.e., a horizontally placed plate).

[0053] The working process of this device is as follows: First, water is injected into the nitrification zone through the water source, inlet pipe, and spray pipe; after nitrification treatment, the water in the nitrification zone first enters the storage zone through the first permeable port 19, and then enters the ozone disinfection zone in the disinfection zone through the second permeable port 10 and the water guiding channel. After the ozone disinfection zone has water, the ozone generator is turned on to aerate the ceramic disc; the water in the ozone disinfection zone flows over the wall and enters the pumping zone. After the pumping zone has water, the submersible pump and ultraviolet tube are turned on to thoroughly disinfect the water.

[0054] During the use of this equipment, the ozone generator can be turned off while all other equipment is turned on, in which case the ultraviolet tube is responsible for disinfection of the water.

[0055] If there are contaminants (such as uneaten bait) at the bottom of the nitrification zone during the use of this equipment, the drain valve can be opened to discharge the contaminants. The bottom drain valve in the water storage zone can also be opened to discharge the contaminants as needed.

[0056] The first permeable inlet has 19 mesh grids to prevent nitrification balls from entering the water storage area.

[0057] The water storage tank integrates a nitrification module and a disinfection module (ozone disinfection and ultraviolet disinfection), and also includes a water storage tank within the storage zone. The nitrification zone is further enhanced with packing materials (nitrification balls, porous balls, etc.) and an aeration device to achieve further biochemical treatment of the water, thereby improving water quality. Both the nitrification zone and the storage zone are equipped with conical bottoms for easy collection and discharge of wastewater. This device effectively extends the nitrification time of the circulating water and can effectively reduce ammonia nitrogen and nitrite in the aquaculture water. The ozone disinfection zone adopts a negative pressure design, i.e., a closed top, which can improve ozone utilization and disinfection effect, and the decomposed oxygen can also fully dissolve into the aquaculture water.

[0058] like Figure 5-8 The solid-liquid separator is a vertical flow sand filter device, which includes an outer barrel 115, an inlet pipe, a central pipe 109, and six sand filter barrels 103; the inlet pipe, the central pipe, and the multiple sand filter barrels are all located inside the outer barrel; the sand filter barrels are equipped with multiple sand filter bags 106. The inner cavity of the outer tub is divided into an upper overflow area 117, a middle filtration area 107, and a bottom dirt collection area 111; The central tube is coaxially arranged with the outer barrel and is fixed inside the outer barrel (specifically supported by the frame plate and the inclined plate filter) and located in the filtration area; the water inlet pipe is composed of a horizontal section 114 and a vertical section 101 connected together; the outer end of the horizontal section of the water inlet pipe extends from the side wall of the outer barrel as the water inlet end; the vertical section of the water inlet pipe is arranged inside the central tube and the water inlet pipe and the central tube are coaxial. The bottom of the outer tub has a drain outlet 113; the drain outlet can be connected to a drain pipe with a valve; Six sand filter barrels are supported by a frame and installed inside the outer barrel; the sand filter barrels are located in the filtration zone; the walls of the sand filter barrels are made of mesh plates to facilitate the entry of wastewater from the filtration zone into the sand filter barrels; the bottom of the sand filter barrels is higher than the bottom of the central pipe; The outer barrel is equipped with horizontally arranged baffles 104; multiple sand filter barrels are inserted vertically into the through holes on the baffles; the baffles serve to isolate the water in the filtration zone from entering the overflow zone, and the water can only enter the overflow zone after passing through the sand filter.

[0059] An overflow pipe 116 is provided on the wall of the outer barrel; the overflow pipe is located below the upper end of the sand filter barrel and above the partition.

[0060] The outer barrel is equipped with a support plate 108 for supporting the sand filter barrel. The outer barrel is also equipped with an inclined plate filter 110 to prevent impurities from flowing back from the dirt collection area into the filtration area.

[0061] The six sand filter barrels are evenly distributed along the circumference of the outer barrel.

[0062] The sand filter bucket is equipped with a handle 102. This makes it easy for operators to lift and insert the sand filter bucket and perform regular cleaning and maintenance.

[0063] The sand filter barrel is equipped with brush columns 105, which can further enhance the filtration effect.

[0064] An isolation cylinder 118 with water-permeable holes is provided between the brush column and the sand filter bag to isolate the sand filter bag and the brush column and prevent the sand filter bag from squeezing the brush column.

[0065] The bottom of the sludge collection area is a tapered cone bottom 112.

[0066] The top of the sand filter has a ring 119 for hanging the sand filter in the through hole, so that the bottom and top of the sand filter can bear the force, making the structure more robust.

[0067] A wastewater treatment method employs the aforementioned wastewater treatment device based on a vertical flow sand filter. The treatment process is as follows: wastewater enters the central pipe through the inlet pipe and then enters the filtration zone, where the wastewater is filtered by the sand filter bucket. The clear liquid is discharged through the overflow pipe, and impurities enter the sludge collection zone to settle.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tidal aquaculture system, characterized in that, It includes aquaculture tanks and a tidal recirculating water treatment system; the tidal recirculating water treatment system includes a solid-liquid separator, a nitrification system, a water storage tank, and an oxygen supply and aeration system; The oxygen supply and aeration system provides oxygen to the breeding tanks and nitrification system; The inlet of the breeding tank is connected to the water storage tank via a circulation pump and pipeline; the outlet of the breeding tank is connected to the inlet of the nitrification system via a solid-liquid separator. It also includes a controller and sensors installed inside the aquaculture tank; the controller is connected to the sensors, which are used to detect the pH value, water level, water temperature and dissolved oxygen content in the aquaculture water; the circulation pump is controlled by the controller. Under the control of the controller, the breeding tank adopts a tidal water circulation method to realize water inlet and outlet; Tidal circulation mode refers to a mode that combines micro-flow drainage mode and rapid water replenishment mode; Under normal circumstances, micro-flow drainage mode is used; When the water level drops to the preset water replenishment level, rapid water replenishment is initiated until the water level reaches the preset normal level; the process maintains a slow, gentle drainage mode throughout; the preset water replenishment level is lower than the preset normal level.

2. The tidal aquaculture system according to claim 1, characterized in that, It adopts a modular design; the volume of each aquaculture water body is ≤100 cubic meters; each aquaculture water body is equipped with an independent tidal circulating water treatment system.

3. The tidal aquaculture system according to claim 1, characterized in that, It also includes an ozone generator, and the effluent from the nitrification system is treated by the ozone generator before entering the storage tank.

4. The tidal aquaculture system according to claim 1, characterized in that, It also includes a fermentation system; the residue outlet of the solid-liquid separator is connected to the fermentation system.

5. The tidal aquaculture system according to claim 1, characterized in that, The solid-liquid separator is a vertical flow sand filter device.

6. The tidal aquaculture system according to claim 1, characterized in that, The preset water replenishment level is 65-80% of the preset normal water level.

7. The tidal aquaculture system according to any one of claims 1-6, characterized in that, It also includes an ecological treatment system, through which the effluent from the nitrification system flows before entering the storage tank.

8. The tidal aquaculture system according to claim 7, characterized in that, The ecological treatment system is an aquaponics system.

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