High-density aquaculture system

Abstract

The utility model belongs to the technical field of aquaculture devices, and particularly relates to a high-density aquaculture system. The system comprises a gas-liquid contact device, a water pumping device, a pipeline and a tiny bubble generator, the gas-liquid contact device comprises a water inlet, a gas inlet and a water outlet; the air inlet is connected with an air source; the other end of the water pumping device is connected with a water source; one end of the pipeline is connected with the water outlet, and the other end of the pipeline is connected with the micro-bubble generator which is arranged in the culture pond. According to the high-density aquaculture system, the purposes of air flotation, oxygenation and ozone sterilization in the culture pond can be achieved by using one set of equipment, and the equipment is simple and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of aquaculture devices, and particularly relates to a high-density aquaculture system. Background Art

[0002] In order to improve the utilization rate of land, high-density aquaculture has emerged as the times require. However, high-density aquaculture currently faces two problems: (1) how to maintain the dissolved oxygen required for the growth of aquaculture organisms (such as fish); the solubility of oxygen in water is extremely low. For example, at 20 °C, the saturated dissolved oxygen in fresh water is 9.08 mg / L, and the dissolved oxygen suitable for the normal growth of fish should be above 5 mg / L. The average oxygen consumption of one kilogram of fish per hour is 0.2 g; while the aquaculture density in high-density aquaculture can reach 100 kg / m 3 ³, and the oxygen consumption of fish per cubic meter of water body is 20 g / hour. Therefore, the dissolved oxygen content determines whether the aquaculture organisms (fish) in high-density aquaculture can grow well and survive; (2) how to properly handle the excrement of aquaculture organisms; the excrement of aquaculture organisms in high-density aquaculture will also increase exponentially. If the excrement cannot be processed in time, ammonia nitrogen and nitrite will be produced, and bacteria or parasites will breed, causing the aquaculture organisms to get sick or die. Therefore, the treatment of the excrement of aquaculture organisms in high-density aquaculture determines whether the aquaculture organisms will get sick or die. In addition, once an aquaculture organism is infected with bacteria or parasites, the transmission of bacteria or parasites also needs to be considered; for example, the hanging fish (also known as thin fish in some areas), which is popular among consumers due to its small fishy smell and delicious taste, is prone to getting sick or dying due to water mold and gill mold caused by the outbreak of Ichthyophthirius multifiliis, so the water body or fish needs to be sterilized (insecticidal).

[0003] Through years of development, a large number of oxygen-increasing technologies have emerged at present, such as blower microporous aeration oxygenation, waterwheel oxygenation, impeller oxygenation, U-shaped tube, pressurized filling cylinder, oxygen cone oxygenation, LHO oxygenator oxygenation, nanoporous ceramic disk oxygenation, hollow ultrafiltration membrane oxygenation, jet oxygenation, etc.; currently, the most common in high-density aquaculture is the use of oxygen cone oxygenation and ceramic disk microporous oxygenation; in terms of excrement treatment, there are mainly technologies such as microfiltration machines, vertical / whirlpool precipitation, sand filter tanks, and foam filter beads to remove residual baits, feces, and suspended solids (TSS) in water from the water body as much as possible to reduce water pollution; since the density of the residual baits and feces of aquaculture organisms (especially fish) is very close to that of water, between 1.05 and 1.2 times the density of water, it is very easy to be floated to the water surface by air flotation in the case of adhering to fine bubbles and discharged from the aquaculture pond through the water surface discharge method; for the problem of the transmission of bacteria or parasites, ozone sterilization (insecticidal) is mainly used at present.

[0004] However, the current oxygenation, air flotation, and ozone sterilization (insecticidal) are all processed using different devices respectively, with low energy efficiency and inconvenient operation. Summary of the Utility Model

[0005] To solve the above problems, the utility model integrates oxygenation, air flotation and ozone sterilization (insecticidal) into an integrated system, that is, a set of systems can not only oxygenate the water body and sterilize it with ozone, but also air-float and discharge the residual bait feces, suspended matter, and cysts (cyst stage) and larvae (predatory body) after sterilization (insecticidal) in the water body, reducing energy efficiency and being convenient to operate.

[0006] To achieve the above object, the utility model can adopt the following technical solutions:

[0007] The utility model provides a high-density aquaculture system, which includes a gas-liquid contact device, a water pumping device, a pipeline and a microbubble generator; the gas-liquid contact device includes a water inlet, a gas inlet and a water outlet; the gas inlet is connected to a gas source; one end of the water pumping device is connected to the water inlet, and the other end is connected to a water source; one end of the pipeline is connected to the water outlet, and the other end is connected to the microbubble generator, and the microbubble generator is arranged in the aquaculture pond.

[0008] When the high-density aquaculture system of the utility model is in use, one end of the gas source can be connected to different gas sources according to actual situations: (1) Connect to an oxygen source (which can be liquid oxygen or gaseous oxygen). When connecting to the oxygen source, the purpose of simultaneous air flotation and oxygen filling can be achieved; (2) Connect to an ozone source. When connecting to the ozone source, the purpose of simultaneous air flotation and ozone sterilization can be achieved; (3) Connect to other air flotation gas sources (generally air). When connecting to other air flotation gas sources, the purpose of air flotation can be achieved; in addition, if oxygen and ozone are needed during this period, the oxygen source or ozone source can be connected first, and then the other gas source can be connected; after selecting the gas source, the gas is pumped into the gas-liquid contact device through the gas inlet, and at the same time, the water pumping device pumps the water in the water source into the gas-liquid contact device through the water inlet, and the gas and water are fully mixed; then it enters the microbubble generator through the water outlet, and then micro-nano bubbles are generated to achieve the purpose of air flotation, oxygenation and / or ozone sterilization.

[0009] The beneficial effect of the utility model is that the high-density aquaculture system provided by the utility model can achieve the purpose of air flotation, oxygenation and ozone sterilization (insecticidal) in the aquaculture pond by using a set of equipment, reducing energy efficiency and being convenient to operate. Description of the Drawings

[0010] Figure 1 It is a structural schematic diagram of the high-density aquaculture system of the utility model;

[0011] Figure 2 It is another structural schematic diagram of the high-density aquaculture system of the utility model;

[0012] Figure 3Schematic diagram of different installation methods of the air source for the high-density aquaculture system of the present utility model;

[0013] Figure 4 Another structural schematic diagram of the high-density aquaculture system of the present utility model;

[0014] Figure 5 Schematic diagram of different installation methods of a gas pumping device and an air source for the high-density aquaculture system of the present utility model;

[0015] Figure 6 Another schematic diagram of different installation methods of a gas pumping device and an air source for the high-density aquaculture system of the present utility model;

[0016] Figure 7 Schematic diagram of the installation method of the water inlet control valve for the high-density aquaculture system of the present utility model.

[0017] Figure 8 Schematic diagram of the structure of a gas-liquid contact device for the high-density aquaculture system of the present utility model;

[0018] Figure 9 Another schematic diagram of the structure of a gas-liquid contact device for the high-density aquaculture system of the present utility model;

[0019] Figure 10 Schematic diagram of the structure of a pipeline layout for the high-density aquaculture system of the present utility model;

[0020] Figure 11 Another schematic diagram of the structure of a pipeline layout for the high-density aquaculture system of the present utility model;

[0021] Figure 12 Another schematic diagram of the structure of a pipeline layout for the high-density aquaculture system of the present utility model;

[0022] Figure 13 Schematic diagram of the surface water discharge device and the cross-section of the drain pipe for the high-density aquaculture system of the present utility model;

[0023] Figure 14 Schematic diagram of the structure of a medicine storage barrel and a metering pump of a medicine feeding device for the high-density aquaculture system of the present utility model;

[0024] Figure 15 Another structural schematic diagram of the high-density aquaculture system of the present utility model;

[0025] In the figure, 1: gas-liquid contact device; 101: water inlet; 102: air inlet; 103: water outlet; 104: first water-permeable sieve plate; 105: second water-permeable sieve plate; 106: packing; 107: sewage outlet; 108: liquid level sensor; 109: pressure transmitter; 110; overpressure protection switch; 2: air pumping device; 201: gas source; 202: air inlet control valve; 3: water pumping device; 301: water source; 302: water inlet control valve; 4: pipeline; 41: first pipeline; 42: second pipeline; 43: third pipeline; 5: aeration column; 501: water outlet control valve; 6: microbubble generator; 7: aquaculture pond; 8: surface water discharge device; 9: drain pipe; 10: drug dosing device; 1001: drug storage barrel; 10011: stirring component; 1002: metering pump; 11: on-line dissolved oxygen meter; 12: ORP sensor; 13: control box. Detailed implementation mode

[0026] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The present invention will be further described below with reference to the drawings and embodiments.

[0029] Refer to Figure 1, the present utility model provides a high-density aquaculture system, which comprises a high-density aquaculture system. It is characterized by including a gas-liquid contact device 1, a water pumping device 3, a pipeline 4, and a microbubble generator 6; the gas-liquid contact device 1 includes a water inlet 101, a gas inlet 102, and a water outlet 103; the gas inlet 102 is connected to a gas source 201; one end of the water pumping device 3 is connected to the water inlet 101, and the other end is connected to a water source 301; one end of the pipeline 4 is connected to the water outlet 103, and the other end is connected to the microbubble generator 6, and the microbubble generator 6 is arranged in the aquaculture pond 7.

[0030] When the high-density aquaculture system of the present utility model is in use, one end of the gas source 201 can be connected to different gas sources 201 according to actual situations: (1) Connect to an oxygen source 201 (which can be liquid oxygen or gaseous oxygen). When connecting to the oxygen source 201, the purposes of both air flotation and oxygen filling can be achieved; (2) Connect to an ozone source. When connecting to the ozone source, the purposes of both air flotation and ozone filling for sterilization can be achieved; (3) Connect to other air flotation gas sources (generally air). When connecting to other air flotation gas sources, the purpose of air flotation can be achieved; in addition, if oxygen and ozone are needed during this period, the oxygen source 201 or the ozone source can be connected first, and then the other gas source 201 can be connected; after selecting the gas source 201, the gas is pumped into the gas-liquid contact device 1 through the gas inlet 102 by the gas pumping device 2, and at the same time, the water in the water source 301 is pumped into the gas-liquid contact device 1 through the water inlet 101 by the water pumping device 3, and the gas and water are fully mixed; then it enters the microbubble generator 6 through the water outlet 103, and then micro-nano bubbles are generated to achieve the purposes of air flotation, oxygenation, and / or ozone filling for sterilization.

[0031] It should be noted that the "gas source" in the present utility model specifically refers to a gas source with pressure, and it can enter the gas-liquid contact device 1 without using a pump.

[0032] It should be understood that the purpose of the gas-liquid contact device 1 is to enable the water and gas to be well mixed. Therefore, the positions of the water inlet 101 and the gas inlet 102 are at the upper end of the gas-liquid contact device 1, and the position of the water inlet 101 is higher than that of the gas inlet 102.

[0033] It should be noted that the above-mentioned microbubble generator 6 is a device that can produce "milky" water in the aquaculture pond 7, that is, it can generate nanoscale bubbles; thus, it has the function of air flotation, forming scum on the water surface of the aquaculture pond 7. The air flotation time (hours) = the volume of the fish pond (cubic meters) / the water output per hour of the microbubble generator 6 (cubic meters); moreover, the microbubble generator 6 can better dissolve oxygen in water, increasing the dissolved oxygen in the water body; in addition, the microbubble generator 6 can also better dissolve ozone in water to disinfect and sterilize the water body. The microbubble generator 6 is a device known in the art, such as the microbubble generator disclosed in Patent CN111330469A.

[0034] It should also be noted that promoting the water flow in the aquaculture pond plays a very important role in recirculating aquaculture. However, the flow rate is related to the body length of the fish. Generally, it is better that the water flow speed per second is between 0.5 and 2 times the body length of the fish. In other words, the smaller the fish, the smaller the required water flow speed, and the larger the fish, the larger the required water flow speed; the present utility model can gradually increase the water-pushing speed as the fish grows, and this water-pushing does not require additional equipment. In contrast, for the existing ceramic disk aeration, additional water-pushing equipment is required; in addition, except that the water-pushing flow rate gradually increases as the fish grows, the oxygenation amount also gradually increases as the fish grows; moreover, when the fish eats, the oxygen consumption is more than three times that of normal times, so during the fish eating stage, it is also necessary to increase the oxygen input.

[0035] It should also be noted that as mentioned above, currently, the most common methods for high-density aquaculture are oxygen cone aeration and ceramic disk microporous aeration. However, oxygen cone aeration has relatively high requirements for water pressure, usually requiring a water head of not less than 20 meters, which means higher energy consumption; although ceramic disk microporous aeration can utilize the pressure of oxygen itself and no longer requires energy consumption, ceramic disk microporous aeration realizes aeration by increasing the contact between oxygen and water through the micropores on the ceramic disk. Compared with the diameter of oxygen molecules, these micropores are also very large, so the oxygen utilization rate is low. At the same time, the micropores on the ceramic disk are easily blocked by microbial films or water scales. Apparently, the energy consumption of using ceramic disk microporous aeration is very low, but considering the fact that the oxygen utilization rate is only 5% - 10%, the opposite conclusion will be drawn; the high-density aquaculture system of the present utility model has low energy consumption, especially the air flotation completely breaks the inherent impression of high energy consumption of people and solves the main obstacle in applying air flotation technology to high-density aquaculture.

[0036] Furthermore, referring to Figure 2 , an aeration column 5 can be provided between the above-mentioned pipeline 4 and the microbubble generator 6.

[0037] It should be noted that in order to further increase the oxygen dissolution rate and the amount of dissolved oxygen, an oxygenation column 5 can be installed after the pipeline 4, and then a microbubble generator 6 is installed on the oxygenation column 5. More than 1 microbubble generator 6 can be installed on one oxygenation column 5, and the specific quantity can be set according to the specific situation. In addition, the oxygenation column 5 can be a long cavity body with water inlet at one end and closed at the other end.

[0038] It should also be noted that the number of oxygenation columns 5 can be set according to specific needs. When more than 2 oxygenation columns 5 are installed, vertical installation and horizontal installation can be selected (half are vertically installed and half are horizontally installed). In this way, the water outlet direction of the microbubble generator 6 on the vertically installed oxygenation column 5 is arranged along the tangential direction of the aquaculture pond 7 wall, and the horizontally installed oxygenation column 5 is installed along the radial direction of the aquaculture pond 7; the water outlet directions of the microbubble generators 6 on all the oxygenation columns 5 in the aquaculture pond 7 face the same clockwise direction, which can achieve the purposes of uniform air flotation, uniform oxygenation and uniform sterilization. In addition, the oxygenation column 5 is generally selected to be installed on the aquaculture pond 7 wall.

[0039] Furthermore, referring to Figure 2 , an oxygenation column 5 can be provided between the above-mentioned pipeline 4 and the microbubble generator 6, and a water outlet control valve 501 is provided between the oxygenation column 5 and the microbubble generator 6.

[0040] It should be noted that in order to facilitate the good control of the output oxygen, ozone or other air flotation gases, a water outlet control valve 501 can be provided between the oxygenation column 5 and the microbubble generator 6, and the flow rate can be controlled and the valve can be switched on and off as needed. In addition, the water outlet control valve 501 can be an underwater solenoid valve, an underwater electric valve or an underwater pneumatic valve, etc., and an underwater pneumatic valve is preferred.

[0041] Furthermore, referring to Figure 3 , the air inlet 102 can be connected to at least n gas sources 201, and n - 2 or more air inlet control valves 202 are provided, where n ≥ 2 and n is an integer.

[0042] It should be noted that as described above, the gas source in the present utility model can be an oxygen source, an ozone source, or other air flotation gas sources. Therefore, the air inlet 102 can be connected to two gas sources simultaneously. The two gas sources can be an oxygen source and an ozone source, an oxygen source and other air flotation gas sources, or an ozone source and other air flotation gas sources. Specifically, when the two gas sources are an oxygen source and an ozone source, both can be used as air flotation gases. If only air flotation is required, one of the gas sources can be replaced with other air flotation gas sources. Similarly, when the two gas sources are other air flotation gas sources and one of an oxygen source or an ozone source, if oxygen or ozone is needed, one of the gas sources can be replaced with an oxygen source or an ozone source. Of course, the air inlet 102 can also be connected to three gas sources simultaneously, which are an oxygen source, an ozone source, and other air flotation gas sources. Additionally, it should be noted that in high-density aquaculture, a large amount of dissolved oxygen is required. Therefore, when oxygen is introduced, the air flotation requirement can be met. Preferably, the air inlet 102 is connected to an oxygen source and an ozone source. The oxygen source is generally liquid oxygen, and the liquid oxygen itself has a high pressure and can directly enter the gas-liquid contact device 1. The ozone source is generally an ozone generator that prepares ozone on-site (since ozone decays, it is generally prepared on-site). The ozone generator has a certain pressure and can directly enter the gas-liquid contact device 1. For conventional air without pressure, gaseous oxygen, and ozone stored in a container, they need to be pressurized through existing technologies and then enter the gas-liquid contact device 1.

[0043] Furthermore, referring to Figure 4 , a gas pumping device 2 can also be provided between the air inlet 102 and the gas source 201. The gas pumping device 2 is connected to at least n gas sources 201 and is provided with more than n - 2 inlet control valves 202, where n ≥ 2 and is an integer; or the gas pumping device 2 can be m, where m ≥ 2 and is an integer. A single gas pumping device 2 is connected to a single gas source 201 and is provided with more than m - 2 inlet control valves 202.

[0044] It should be noted that as described above, in the present high-density aquaculture system, when the pressure of the oxygen source, the ozone source, or other air flotation gases is insufficient, a gas pumping device 2 can be provided between the air inlet 102 and the gas source 201 to provide power and input the gas source gas 201 into the gas-liquid contact device 1.

[0045] Specifically, referring to Figure 5, the above-mentioned air pump device 2 is connected to at least n air sources 201, and is provided with n-2 or more air intake control valves 202, n≥2 and is an integer. As described above, the air source in the utility model can be an oxygen source or an ozone source and other flotation air sources, so the air pump device 2 can be connected to two air sources at the same time, and the two air sources can be an oxygen source and an ozone source, an oxygen source and other flotation air sources, or an ozone source and other flotation air sources; specifically, when the two air sources are an oxygen source and an ozone source, they can both be used as flotation gases. If only flotation is needed, one of the air sources can be replaced with other flotation air sources. Similarly, when the two air sources are other flotation air sources and one of the oxygen source or ozone source, if oxygen or ozone is needed, one of the air sources can be replaced with an oxygen source or an ozone source. At this time, the air source 201 and the air pump device 2 are detachable. Of course, the air pump device 2 can also be connected to three air sources at the same time, and the three air sources are an oxygen source, an ozone source and an oxygen flotation air source.

[0046] It should also be noted that, for the air intake control valve 202, when there are n air sources, an air intake control valve 202 can be provided. It is also possible not to provide the air intake control valve 202. When the air intake control valve 202 is provided, there can be one or two air intake control valves 202. It should be understood that the number of air intake control valves 202 is preferably n at most. It should also be noted that some air pumping devices 2 have valves, while some air pumping devices 2 do not have valves. In this case, the air intake control valve 202 can be an additional valve, or it can refer to a valve that comes with the air pumping device 2.

[0047] Specifically, refer to Figure 6 , the above-mentioned air pumping device 2 may be m, m ≥ 2 and is an integer, a single air pumping device 2 is connected to a single gas source 201, and m-2 or more air intake control valves 202 are provided. It should be noted that, in addition to the above-mentioned same air pumping device 2 being connected to n gas sources 201, multiple air pumping devices 2 may be connected to multiple gas sources 201, and the gas sources 201 and the air pumping devices 2 correspond one to one; similarly, at this time, the air intake control valve 202 may be provided, or the air intake control valve 202 may not be provided. When the air intake control valve 202 is provided, the maximum number may preferably be m, and at this time, the air intake control valve 202, the gas source 201 and the air pumping device 2 correspond one to one. Similarly, the air intake control valve 202 may refer to the valve of the air pumping device 2 itself, or it may be an additional valve.

[0048] It should also be noted that in the present utility model, oxygen and other flotation gases can preferably use different air pumping devices 2 respectively, and the advantages are as follows: (1) They serve as backups for each other, improving redundancy and making the system safer and more reliable; (2) Since there are slight differences in the flow-head Q-H configuration between oxygenation and flotation, if each uses a set of pumps, the optimal efficiency points can be matched respectively. From the perspective of the pump efficiency curve, the selection range of each pump is expanded, and even the styles of the two pumps can be different.

[0049] It should also be noted that in actual aquaculture, oxygen is added to the fish pond to ensure that the dissolved oxygen is within the range of 5 mg / L - 9 mg / L.

[0050] Furthermore, referring to Figure 7 , the above-mentioned water pumping device 3 is also provided with an inlet control valve 302. It should be noted that in order to facilitate the control of water entering the gas-liquid contact device 1, an inlet control valve 302 can be provided between the water pumping device 3 and the water source 301. The inlet control valve 302 is a valve known in the art that can control the water flow rate or shut off the water flow. In addition, the inlet control valve 302 can be installed in front of the water pumping device 3 or behind the water pumping device 3. Of course, similarly, the inlet control valve 302 can be the valve of the water pumping device 3 itself or an additional valve.

[0051] Furthermore, referring to Figure 8 , the above-mentioned gas-liquid contact device 1 can also be provided with a first water passing sieve plate 104 and a second water passing sieve plate 105. The first water passing sieve plate 104 and the second water passing sieve plate 105 divide the gas-liquid contact device 1 into three spaces.

[0052] It should be noted that in the present utility model, the function of the gas-liquid contact device 1 is to make the water and gas fully mixed. Therefore, the gas-liquid contact device 1 can be a device known in the art that can achieve the purpose of fully mixing water and gas, such as the gas-liquid contact device 1 described in the patent applications with application numbers CN201810274635.9, CN202110716300.X or CN201810124391.6. Of course, the gas-liquid contact device 1 in the present utility model can be as described above. The structure of the gas-liquid contact device 1 is simple and can achieve the purpose of the present utility model.

[0053] Furthermore, referring to Figure 8 , the above-mentioned first water passing sieve plate 104 and second water passing sieve plate 105 divide the gas-liquid contact device 1 into three spaces, and the space between the first water passing sieve plate 104 and the second water passing sieve plate 105 is filled with packing 106.

[0054] It should be noted that packing 106 can be filled in the independent space between the first water-passing sieve plate 104 and the second water-passing sieve plate 105 in the above gas-liquid contact device 1, which can increase the contact area between water and gas and make the mixing more sufficient.

[0055] Furthermore, referring to Figure 9 , a sewage outlet 107 can also be provided at the bottom of the gas-liquid contact device 1. It should be noted that during the continuous use of the gas-liquid contact device 1, some waste materials may accumulate at the bottom, and the sewage outlet 107 can be provided at the bottom for cleaning the waste materials.

[0056] Furthermore, referring to Figure 15 , one or more liquid level sensors 108 can also be provided between the first water-passing sieve plate 104 and the second water-passing sieve plate 105. It should be noted that the content of gas in the gas-liquid contact device 1 is judged by monitoring the water level in the gas-liquid contact device 1; specifically, when the water level is low, it indicates that there is more gas in the gas-liquid contact device 1, and the gas intake will be stopped. When the liquid level is relatively high, it indicates that there is too little gas in the gas-liquid contact tower, and then the gas intake will start; in this way, the purpose of relatively uniform gas intake can be achieved.

[0057] Furthermore, referring to Figure 15 , a pressure transmitter 109 and an overpressure protection switch 110 can also be provided on the gas-liquid contact device 1.

[0058] It should be noted that in order to prevent the water pressure in the gas-liquid contact device 1 from being too high, a pressure transmitter 109 and an overpressure protection switch 110 can be installed on the gas-liquid contact device 1 to monitor the pressure situation in the gas-liquid contact device 1 at any time. When the pressure is too high, the gas source 201 can be automatically cut off or the water pump device 3 can be stopped to ensure the pressure safety of the gas-liquid contact device 1. The pressure transmitter 109 is a conventional device in the field, such as the pressure transmitter 109 described in patents CN201020546412.2, CN201880006645.2 or CN201921046924.X; the overpressure protection switch 110 is also a conventional device in the field, such as the overpressure protection switch of Hangzhou Binqing Water Treatment.

[0059] Furthermore, referring to Figure 10 and Figure 11 , the above pipeline 4 can include a first pipeline 41 and a second pipeline 42. One end of the first pipeline 41 is connected to the water outlet 103, and the other end is provided with x second pipelines 42, where x≥2, and the x second pipelines 42 are arranged in parallel and are all connected to the aquaculture pond 7.

[0060] It should be noted that in the specific usage process, it may be necessary to connect to multiple aquaculture ponds 7 or connect multiple aeration columns 5 or multiple microbubble generators 6. In this case, the pipeline 4 can be set as the first pipeline 41 and the second pipeline 42, that is, more than 2 second pipelines 42 are arranged after the first pipeline 41. In this way, different aquaculture ponds 7 can be connected respectively, or multiple aeration columns 5 or multiple microbubble generators 6 in the same aquaculture pond 7 can be connected.

[0061] Furthermore, referring to Figure 12 , the above pipeline 4 may include a first pipeline 41, a second pipeline 42 and a third pipeline 43. One end of the first pipeline 41 is connected to the water outlet 103, and the other end is provided with x second pipelines 42, where x≥2, and the x second pipelines 42 are arranged in parallel. After the x second pipelines 42, y third pipelines 43 are arranged, where y≥2, and the y third pipelines 43 are arranged in parallel. All the y third pipelines 43 are connected to the inside of the aquaculture pond 7.

[0062] It should be noted that in order to meet the requirement of arranging multiple aeration columns 5 or multiple microbubble generators 6 in the same aquaculture pond 7 among multiple aquaculture ponds 7, the pipeline 4 can be set as the first pipeline 41, the second pipeline 42 and the third pipeline 43, that is, x second pipelines 42 are arranged after the first pipeline 41, where x≥2, and the x second pipelines 42 can be arranged in parallel; after the second pipeline 42, y third pipelines 43 can be arranged, where y≥2, and the y third pipelines 43 can be arranged in parallel; in this way, common air flotation, oxygenation or ozone sterilization in multiple aquaculture ponds 7 can be realized.

[0063] Furthermore, referring to Figure 13 , the above high-density aquaculture system further includes a surface water discharge device 8 and a drain pipe 9. One end of the surface water discharge device 8 is in contact with the water surface, and the other end is connected to the drain pipe 9. Part of the drain pipe 9 is arranged inside the aquaculture pond 7, and the other end of the drain pipe 9 is outside the aquaculture pond 7 for draining water.

[0064] It should be noted that the surface water discharge device 8 is known in the art, such as a suspended surface water discharge device disclosed in Patent CN201820750896.9. In addition, the above drain pipe 9 can be installed at the bottom of the aquaculture pond, or on the wall of the aquaculture pond, or can be suspended in the aquaculture pond. Generally, it is preferably installed on the wall or bottom of the aquaculture pond for easy fixation.

[0065] Furthermore, one end of the above surface water discharge device 8 can be funnel-shaped, and the other end is connected to one end of the drain pipe 9. It should be noted that in the device of the present utility model, the surface water discharge device 8 can be in the above shape, with a simple structure and good drainage effect.

[0066] It should also be noted that in the device of the present utility model, introducing ozone into the aquaculture system can disinfect and sterilize the water body, including killing water mold fungi, accelerating the healing of wounds, and avoiding bacterial infections. In addition, after the aquatic animals in aquaculture are sterilized by ozone, the cysts and larval predators that have fallen off from the host are discharged to the water surface by means of air flotation, and then enter through the large-opening end of the surface water discharge device 8 and are discharged from the drain pipe 9, reducing the chance of fish being infected. Since fish have a certain resistance themselves, a small number of parasites will not cause great harm and reduce the secondary impact on the water body. At the same time, the feces of the cultured animals also need to be discharged from the water body after air flotation, and can also be discharged from the water body through the surface water discharge device 8 and the drain pipe 9. In addition, when the surface water discharge device 8 is in use, the large-opening end is the edge, horizontally upward, located in the center of the aquaculture pond 7, and the edge is 1 cm - 3 cm below the still water surface; the water with exfoliates on the water surface flows into the surface water discharge device 8 through the edge and is finally discharged outside the aquaculture pond 7, generally discharged to the aquaculture tail water pond.

[0067] Furthermore, not shown in the figure, a filtering device can also be installed at the other end of the above-mentioned drain pipe 9.

[0068] It should be noted that the water with exfoliates or feces discharged through the surface water discharge device 8 can be directly discharged after being filtered by the filtering device in addition to being discharged to the aquaculture tail water pond. In addition, the above-mentioned filtering device can be a filter screen covered at one end of the drain pipe 9, or a filtering device known in the art can also be installed, such as a drum microfilter, a quartz sand filter or a bag filter, etc.; preferably, in order to filter the exfoliates or feces well, the filtering accuracy of the filtering device is preferably 50 um.

[0069] Specifically, the gas-liquid contact device 1 in the high-density aquaculture system of the present utility model can be a cylindrical vertical closed tank body. There is a water inlet 101 at the upper end of the tank body and a water outlet 103 at the lower end. Inside the tank body, a first water-passing sieve plate 104 is arranged along the lower edge of the water inlet 101. The first water-passing sieve plate 104 is horizontally arranged along the cross-section and is connected to the tank wall at the periphery. A plurality of water-passing holes are distributed on the first water-passing sieve plate 104; inside the tank body, a second water-passing sieve plate 105 is arranged along the upper edge of the water outlet 103 but below the first water-passing sieve plate 104. The second water-passing sieve plate 105 is horizontally arranged along the cross-section and is connected to the tank wall at the periphery. A plurality of water-passing holes are distributed on the second water-passing sieve plate 105; an air inlet hole 102 is arranged on the tank wall between the first water-passing sieve plate 104 and the second water-passing sieve plate 105. The air inlet hole 102 is externally connected to an air inlet control valve 202, and the other end of the air inlet control valve 202 is connected to an air source 201; packing 106 is installed in the tank between the first water-passing sieve plate 104 and the second water-passing sieve plate 105, or it can also not be installed; in addition, an overpressure protection switch 110 and a pressure transmitter 109 are also installed on the tank body; in addition, a first liquid level sensor and a second liquid level sensor are also installed on the tank wall between the first water-passing sieve plate 104 and the second water-passing sieve plate 105, and the first liquid level sensor is located above the second liquid level sensor.

[0070] Further, referring to Figure 14 , the above-mentioned high-density aquaculture system further includes a medicine feeding device. The medicine feeding device 10 includes more than 2 medicine storage barrels 1001 and more than 2 metering pumps 1002. A stirring component 10011 is installed in each medicine storage barrel 1001; each medicine storage barrel 1001 is connected to one end of each metering pump 1002, and the other end of each metering pump 1002 is connected to the microbubble generator 6 or the other end of each metering pump 1002 is connected to a pipeline and leads into the periphery of the microbubble generator 6.

[0071] It should be noted that the above-mentioned medicine feeding device 10 can build a support frame beside the aquaculture pond 7, then fix the medicine storage barrel 1001 on the support frame, and then through the metering pump 1002, put the medicine around the microbubble generator 6, or connect it to the microbubble generator 6 (if directly input into the microbubble generator 6, better dispersion can be obtained); it should be understood that the medicine storage barrel 1001, the metering pump 1002 and the microbubble generator 6 are all connected through a medicine delivery pipeline.

[0072] It should also be noted that more than two medicine storage barrels 1001 can be a container divided into more than two spaces, or more than two separate medicine storage barrels 1001, which can be specifically set according to needs.

[0073] It should also be noted that the stirring component 10011 in the medicine storage barrel 1001 can be manually stirred, or a motor can be installed at the upper end for stirring.

[0074] It should also be noted that the above-mentioned cysts and larvae are relatively small in size and have a density slightly greater than that of water. Therefore, substances that enhance the air flotation effect can be added before and during each air flotation. A fouling agent is added before air flotation, preferably edible starch or lactic acid bacteria, and a coagulant is added during air flotation, preferably polyferric sulfate at the water treatment plant level. Specifically, when adding a coagulant to water, it is very easy to coagulate into lumps with other particulate matters, making them lose the ability to move freely, and thus being floated to the water surface and discharged from the water body by surface drainage. In addition, the medicine can be added directly to the water body, or a dosing device 10 can be set up to add the fouling agent and coagulant through a metering pump 1002 and a microbubble generator 6 to enhance the air flotation effect. It should also be noted that in the first three weeks after aquatic animals such as hanging fish are put into the culture pond 7, air flotation is preferably carried out four times a day; after three weeks, the number of air flotation times per day is preferably once.

[0075] It should also be noted that after the cultured animals such as hanging fish are transferred to the culture pond 7, ozone disinfection will be started several times a day, preferably 6 times a day in the first week and 2 times a day in the following period; the ORP value is between 600 - 650, and ozone addition will stop if it exceeds this value.

[0076] Furthermore, referring to Figure 15 , the above-mentioned high-density aquaculture system may further include an on-line dissolved oxygen meter 11 for monitoring the dissolved oxygen content in the culture pond 7; and / or an ORP sensor 12 for monitoring the ORP value in the culture pond 7.

[0077] It should be noted that in order to facilitate the real-time monitoring of the dissolved oxygen content and ORP value in the culture pond 7, an on-line dissolved oxygen meter 11 and / or an ORP sensor 12 can be installed in the culture pond 7; both the on-line dissolved oxygen meter 11 and the ORP sensor 12 are instruments known in the art.

[0078] Furthermore, referring to Figure 15 , the high-density aquaculture system may further include a control box 13, and a pressure transmitter 109, a liquid level sensor 108, an on-line dissolved oxygen meter 11, an intake air control valve 202, a water inlet control valve 302, a water outlet control valve 501 and an ORP sensor 12 are all connected to the control box 13.

[0079] It should be noted that in order to achieve the automatic adjustment of the air flotation frequency, dissolved oxygen content, and ORP value, a control box 13 is provided in the high-density aquaculture system to collect data, analyze data, and send out commands to coordinate and control each device. In addition, the control box 13 is a control box known in the art or a control box that can be designed through the existing technologies in the art. For example, the control box 13 includes a frequency converter and a processor. Signals from a liquid level sensor 108, an overvoltage protection switch 110, a pressure transmitter 109, an on-line dissolved oxygen meter 11, an ORP sensor 12, etc. are all connected to the processor. An intake control valve 202 and each outlet control valve 502, etc. are controlled by the programming of the control system. The signal of the frequency converter is connected to the processor and is controlled by the processor. The water pumping device 3 is controlled by the frequency modulation of the frequency converter.

[0080] It should also be noted that when using the high-density aquaculture system of the present utility model for daily oxygenation, the following steps can be taken: read the data of the on-line dissolved oxygen meter 11, and judge whether the dissolved oxygen value in the current aquaculture pond 7 is within the set range. If the dissolved oxygen value is within the set range, the system maintains the current operating state; if the dissolved oxygen value is lower than the set range, the outlet control valve 501 of a microbubble generator 6 is automatically opened. At this time, when the pressure transmitter detects that the pressure is lower than the set value, it will send a signal to the frequency converter to increase the operating frequency of the water pump. This process is repeated until the dissolved oxygen rises to the set range; on the contrary, if the dissolved oxygen value is higher than the set range, the outlet control valve 501 of a microbubble generator 6 is automatically closed. At this time, when the pressure transmitter 109 detects that the pressure is higher than the set value, it will send a signal to the frequency converter to decrease the operating frequency of the water pump. This process is repeated until the dissolved oxygen value drops to the set range.

[0081] In addition, when using the high-density aquaculture system of the present utility model for timed air flotation, if the system corresponds to multiple aquaculture ponds 7, each aquaculture pond 7 is air floated one by one in sequence; when it reaches the set air flotation time of the current aquaculture pond 7, first the system saves the current operating state, then the preset outlet control valve 501 is opened in sequence, and then the outlet control valve 501 that has not been selected in advance is closed; and, in the case where the oxygenation and air flotation use the same set of pumps, then the frequency converter is switched from the frequency conversion state to the industrial frequency state and runs until the air flotation end time. Finally, the system returns to the previous operating state; in the case where the oxygenation and air flotation each use a set of pumps, the oxygenation water supply pump is closed, and the number of opened outlet control valves 501 of other aquaculture ponds is adjusted. In the case where the system corresponds to multiple aquaculture ponds 7, then the air flotation pump is started and runs until the air flotation end time; then the air flotation pump is closed, the oxygenation pump is opened, and the system returns to the previous operating state.

[0082] In addition, when using the high-density aquaculture system of the present utility model for increasing oxygenation during feeding: 0.5 - 1 hour before feeding, the dissolved oxygen value range is automatically adjusted upward, then the system will automatically increase the number of opened outlet control valves 501, and then 0.5 - 1 hour after the feeding ends, the dissolved oxygen value range is adjusted back, and the system will automatically close some of the outlet control valves 501.

[0083] In addition, the high-density aquaculture system of the present utility model can also be set with an alarm function. When all the outlet control valves 501 are opened and the dissolved oxygen value is still lower than the set dissolved oxygen value range, a reminder alarm is issued; when all the outlet control valves 501 are closed and the dissolved oxygen value is still higher than the set dissolved oxygen value range, a reminder alarm is issued; when the overpressure protection switch 110 is triggered, a fault alarm is issued; when the pressure is too high or too low, a reminder alarm is issued.

Claims

1. A high-density aquaculture system, characterized in that: The invention comprises a gas-liquid contact device (1), a water pumping device (3), a pipeline (4) and a micro-bubble generator (6); the gas-liquid contact device (1) comprises a water inlet (101), an air inlet (102) and a water outlet (103); the air inlet (102) is connected to an air source (201); one end of the water pumping device (3) is connected to the water inlet (101), and the other end is connected to a water source (301); one end of the pipeline (4) is connected to the water outlet (103), and the other end is connected to the micro-bubble generator (6); the micro-bubble generator (6) is arranged in a culture pond (7).

2. The high-density aquaculture system according to claim 1, characterized in that: An oxygenation column (5) is provided between the pipeline (4) and the micro-bubble generator (6); or an oxygenation column (5) is provided between the pipeline (4) and the micro-bubble generator (6), and a water outlet control valve (501) is provided between the oxygenation column (5) and the micro-bubble generator (6).

3. The high-density aquaculture system according to claim 1 or 2, characterized in that: The air inlet (102) is connected to at least n air sources (201) and is provided with n-2 or more air inlet control valves (202), where n≥2 and is an integer.

4. The high-density aquaculture system according to claim 2, characterized in that: An air pumping device (2) is provided between the air inlet (102) and the air source (201), the air pumping device (2) is connected to at least n air sources (201), and is provided with n-2 or more air intake control valves (202), where n is greater than or equal to 2 and is an integer; or the air pumping device (2) can be m, where m is greater than or equal to 2 and is an integer, and a single air pumping device (2) is connected to a single air source (201), and is provided with m-2 or more air intake control valves (202).

5. The high-density aquaculture system according to claim 1, 2 or 4, characterized in that: The gas-liquid contact device (1) is further provided with a first water-passing sieve plate (104) and a second water-passing sieve plate (105); the first water-passing sieve plate (104) and the second water-passing sieve plate (105) divide the gas-liquid contact device into three spaces; or the first water-passing sieve plate (104) and the second water-passing sieve plate (105) divide the gas-liquid contact device into three spaces, and the space (105) between the first water-passing sieve plate (104) and the second water-passing sieve plate is filled with a filler (106).

6. The high-density aquaculture system according to claim 3, characterized in that: The gas-liquid contact device (1) is further provided with a first water-passing sieve plate (104) and a second water-passing sieve plate (105); the first water-passing sieve plate (104) and the second water-passing sieve plate (105) divide the gas-liquid contact device into three spaces; or the first water-passing sieve plate (104) and the second water-passing sieve plate (105) divide the gas-liquid contact device into three spaces, and the independent space (105) between the first water-passing sieve plate (104) and the second water-passing sieve plate is filled with a filler (106).

7. According to the high-density aquaculture system of claim 5, at least one liquid level sensor (108) is arranged between the first water-passing screen plate (104) and the second water-passing screen plate (105); and / or a pressure transmitter (109) and an overpressure protector (110) are installed on the gas-liquid contact device (1); and / or a sewage outlet (107) is arranged at the bottom of the gas-liquid contact device (1).

8. The high-density aquaculture system according to claim 1, 2, 4, 6 or 7, characterized in that: The pipeline (4) comprises a first pipeline (41) and a second pipeline (42); one end of the first pipeline (41) is connected to the water outlet (103); and the other end is provided with x second pipelines (42), where x is greater than or equal to 2, and the x second pipelines (42) are arranged in parallel and are all connected to the culture pond (7); or the pipeline (4) comprises a first pipeline (41), a second pipeline (42) and a third pipeline (43); one end of the first pipeline (41) is connected to the water outlet (103), and the other end is provided with x second pipelines (42), where x is greater than or equal to 2, and the x second pipelines (42) are arranged in parallel; and y third pipelines (43) are arranged behind the x second pipelines (42), where y is greater than or equal to 2, and the y third pipelines (43) are arranged in parallel and are all connected to the culture pond (7).

9. The high-density aquaculture system according to claim 1, 2, 4, 6 or 7, characterized in that: The high-density aquaculture system further comprises a surface water discharge device (8) and a drainage pipe (9), wherein one end of the surface water discharge device (8) contacts the water surface, and the other end is connected to the drainage pipe (9), a portion of the drainage pipe (9) is arranged in the culture pond (7), and the other end of the drainage pipe (9) is outside the culture pond (7) for drainage.

10. The high-density aquaculture system according to claim 9, characterized in that: One end of the surface water discharge device (8) is funnel-shaped, and the other end is connected to one end of the drainage pipe (9).

11. The high-density aquaculture system according to claim 8, characterized in that: The high-density aquaculture system further comprises a surface water discharge device (8) and a drainage pipe (9), wherein one end of the surface water discharge device (8) contacts the water surface, and the other end is connected to the drainage pipe (9), a portion of the drainage pipe (9) is arranged in the culture pond (7), and the other end of the drainage pipe (9) is outside the culture pond (7) for drainage.

12. The high-density aquaculture system according to claim 1, 2, 4, 6, 7, 10 or 11, characterized in that: The high-density aquaculture system also includes a dosing device, which includes more than two medicine storage barrels (1001) and more than two metering pumps (1002), and each medicine storage barrel (1001) is installed with a stirring component (10011); each medicine storage barrel (1001) is connected to one end of each metering pump (1002), and the other end of each metering pump (1002) is connected to a micro-bubble generator (6) or the other end of the metering pump (1002) is connected to a pipeline that passes around the micro-bubble generator (6).

13. The high-density aquaculture system according to claim 1, 2, 4, 6, 7, 10 or 11, characterized in that: The high-density aquaculture system further comprises an online dissolved oxygen meter (11) for monitoring the dissolved oxygen content in the culture pond; and / or an ORP sensor (12) for monitoring the ORP value in the culture pond.

14. The high-density aquaculture system according to claim 2, 4, 6, 7, 10 or 11, characterized in that: The high-density aquaculture system further comprises a control box (13) and an online dissolved oxygen meter (11) for monitoring the amount of dissolved oxygen in the culture pond and / or an ORP sensor (12) for monitoring the ORP value in the culture pond. The pressure transmitter (109), the liquid level sensor (108), the online dissolved oxygen meter (11), the air inlet control valve (202), the water inlet control valve (302), the water outlet control valve (501) and the ORP sensor (12) are all connected to the control box (13).

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