An improved aeration device to prevent the pH value of aquaculture water from decreasing.

Abstract

This utility model discloses an improved aeration device to prevent the pH value of aquaculture water from decreasing, belonging to the technical field of aquaculture equipment. The device includes an air compressor and a CO2 absorption device. The air compressor has an air inlet and an air outlet pipe. The CO2 absorption device is a sealed container filled with a strong alkaline solution, and the CO2 absorption device has an inlet and an outlet. The air compressor outlet pipe is connected to the inlet of the CO2 absorption device and is inserted into the strong alkaline solution. The outlet of the CO2 absorption device is connected to an air stone placed in the aquaculture water through an outlet coil and a hose. This utility model absorbs CO2 from compressed air through the strong alkaline solution in the CO2 absorption device, preventing CO2 from entering the aquaculture water and causing a decrease in pH value. It can maintain a suitable pH environment for fish growth, reduce fish diseases, promote growth, and the device has a simple structure and low cost, making it suitable for widespread application.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture equipment technology, specifically relating to an improved oxygenation device to prevent the pH value of aquaculture water from decreasing. Background Technology

[0002] pH value is an important indicator of water quality and a key factor affecting fish activity. Excessive decreases or increases in pH can directly harm fish, causing death. Even if not fatal, pH levels exceeding the fish's tolerance can lead to physiological dysfunction, affecting growth or causing other diseases.

[0003] pH directly affects fish growth. According to my country's fisheries water quality standards, the suitable pH range for fish farming is 6.5-8.5, with the optimal slightly alkaline condition between pH 7 and 8.5. In acidic conditions (pH below 5.5), the pH of fish blood decreases, weakening its oxygen-carrying capacity and causing physiological hypoxia. This leads to tissue hypoxia, difficulty breathing, reduced activity, decreased metabolism, reduced food intake, low feed digestibility, and slow growth. It can also cause coagulative necrosis of gill tissue, increased mucus, and abdominal congestion and inflammation. If the water pH is below 4.4, it can cause fish mortality, with a mortality rate of 7%-20%, and below 4%, all fish will die. Furthermore, fish are particularly susceptible to infectious fish diseases and parasitic infections under acidic conditions. For example, when the pH value is between 5 and 6.5 and the temperature conditions are suitable (22-32℃), the fish raised are susceptible to infection with acidophilic dinoflagellates and suffer from "powder disease".

[0004] Changes in pH not only alter the concentration of certain chemicals in water but also change the forms in which many substances exist, particularly toxic substances. This alteration in the form of toxic substances leads to changes in their toxicity, indirectly affecting the life activities of fish. For example, at lower pH values, Fe... 2+ S 2- and CN 2- The concentration of these substances will increase, and they may be converted into more toxic forms such as H2S (it has been determined that more than 90% of sulfides in water exist in the form of H2S when the pH value is below 6) and HCN. The toxicity of these components has a synergistic effect with low pH value, that is, the lower the pH value, the greater the toxicity and the greater the harm to fish.

[0005] Many factors determine the pH value of water, but the most important are the balance system of free carbon dioxide and carbonate in the water, as well as the content of organic matter in the water and its decomposition conditions. The balance system of carbon dioxide and carbonate changes according to the hardness of the water and the increase or decrease of carbon dioxide.

[0006] Currently, the commonly used air stone aeration device in indoor cement or tempered glass aquaculture ponds mainly consists of an air compressor, plastic tubing, and air stones. The air compressor's inlet is open to the atmosphere, and the outlet guides compressed air underwater through the plastic tubing. The end of the tubing connects to the air stone, which utilizes its micropores to increase the contact area between the gas and water, thus achieving oxygenation. However, this device has a drawback: CO2 from the air enters the water along with the air. Since one volume of water can dissolve one volume of carbon dioxide, and the pH value of water is mainly determined by the balance between free carbon dioxide and carbonates, the CO2 entering the water with the air will lower the pH value, which is detrimental to aquaculture production and requires further improvement. Utility Model Content

[0007] This invention provides an improved aeration device to prevent the pH value of aquaculture water from decreasing. It can solve the problem that existing air stone aeration devices cannot remove CO2 from the air, which leads to a decrease in the pH value of aquaculture water and affects fish growth.

[0008] To solve the above problems, the technical solution provided by this utility model is as follows:

[0009] This utility model embodiment provides an improved oxygenation device to prevent the pH value of aquaculture water from decreasing, including an air compressor (1) and a CO2 absorption device (4). The air compressor (1) is connected to an air inlet (2) and an air outlet pipe (3). The air outlet pipe (3) extends from the top of the CO2 absorption device (4) to a strongly alkaline solution layer (5) inside it. The top of the CO2 absorption device (4) is also provided with an outlet coil (6). A first hose (8) and a second hose (10) are connected to one terminal of the outlet coil (6). A first air stone (9) is connected to the end of the first hose (8), and a second air stone (11) is connected to the end of the second hose (10). The first air stone (9) and the second air stone (11) are placed in the aquaculture water (13) of the aquaculture tank (12).

[0010] In one optional embodiment of this utility model, the CO2 absorption device (4) is a sealed plastic jug.

[0011] In one optional embodiment of this utility model, the strongly alkaline solution layer (5) is a saturated sodium hydroxide solution layer, and the volume of the strongly alkaline solution layer (7) is 1 / 3 of the volume of the CO2 absorption device (4).

[0012] In one optional embodiment of this utility model, both the first gas stone (9) and the second gas stone (11) are porous cylindrical structures.

[0013] Compared with the prior art, the present invention provides an improved oxygenation device to prevent the pH value of aquaculture water from decreasing, which has the following effects: (1) The present invention installs a sealed plastic jug containing 1 / 3 volume of saturated sodium hydroxide solution between the air compressor outlet and the water body. The plastic jug has an inlet and an outlet. The air compressor outlet is inserted into the saturated sodium hydroxide solution in the jug through the inlet of the plastic jug via a hose. Under the action of airflow, the gas after absorbing CO2 through the saturated sodium hydroxide solution enters the aquaculture water through the outlet of the plastic jug, thereby achieving the purpose of preventing the pH value of the aquaculture water from decreasing due to CO2 carrying in. It can effectively remove CO2 from the air entering the aquaculture water, prevent the pH value of the water from decreasing due to CO2 carrying in, and maintain a pH environment suitable for fish growth. (2) It reduces the harm of acidic water to fish, reduces the probability of physiological and infectious diseases of fish, promotes fish growth, and improves aquaculture efficiency. (3) The device has a simple structure, is easy to manufacture and install, and has a low cost. It is suitable for promotion and application in indoor cement ponds, tempered glass ponds and other aquaculture scenarios. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments 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 the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an improved aeration device for preventing the pH value of aquaculture water from decreasing, provided in an embodiment of this application. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The terms "upper," "lower," "front," "rear," "left," and "right," etc., used when describing the installation position or direction of the structure or components in this embodiment are based on the orientation shown in the accompanying drawings. They are merely for convenience of description, used to distinguish the relative positions of various components or directions, and do not represent the orientation of the device or functional component in this embodiment during use.

[0017] The air stone aeration device, commonly used in indoor cement or tempered glass aquaculture ponds, has a relatively simple structure, mainly consisting of an air compressor, plastic pipes, and air stones. The air compressor has an inlet and an outlet. The inlet is usually directly connected to the atmosphere, while the outlet introduces compressed air into the water through several plastic pipes. The ends of the plastic pipes are connected to the air stones. Because the air stones have many micropores, the compressed air entering the water through the plastic pipes and air stones greatly increases the contact area between the gas and the water, thereby achieving the purpose of oxygenation. The air stone aeration device can replenish more oxygen to the lower layers of oxygen-deficient water, can evenly diffuse the air into each water layer, and can also accelerate the diffusion of toxic gases produced at the bottom under oxygen-deficient conditions into the air. Air stone aeration devices also have their drawbacks. Although the amount of CO2 in the air is relatively small, one volume of water can usually dissolve one volume of carbon dioxide. Furthermore, the pH value of water is mainly determined by the balance system of free carbon dioxide and carbonates in the water. Therefore, CO2 entering the water with the air can affect the pH value of the water, usually causing the pH value to drop, which is not conducive to aquaculture production.

[0018] like Figure 1 As shown, an improved aeration device for preventing the pH value of aquaculture water from decreasing includes an air compressor 1 and a CO2 absorption device 4. The air compressor 1 is connected to an air inlet 2 and an air outlet 3. The air outlet 3 extends from the top of the CO2 absorption device 4 to a strongly alkaline solution layer 5 inside it. The top of the CO2 absorption device 4 is also provided with an outlet coil 6. A first hose 8 and a second hose 10 are connected to one terminal of the outlet coil 6. A first air stone 9 is connected to the end of the first hose 8, and a second air stone 11 is connected to the end of the second hose 10. The first air stone 9 and the second air stone 11 are placed in the aquaculture water 13 of the aquaculture tank 12.

[0019] CO2 absorption device 4 is a sealed plastic container. The strongly alkaline solution layer 5 is a saturated sodium hydroxide solution layer, and the volume of the strongly alkaline solution layer 7 is 1 / 3 of the volume of CO2 absorption device 4. The first gas stone 9 and the second gas stone 11 are both porous cylindrical structures.

[0020] The present invention adds a CO2 absorption device between the air compressor outlet and the aquaculture water. The CO2 absorption device is a sealed container filled with a strongly alkaline solution, such as a saturated sodium hydroxide solution, at one-third of its volume. The container has an inlet and an outlet. The air compressor outlet is connected to the inlet of the CO2 absorption device via a flexible hose, with the end of the hose inserted into the strongly alkaline solution. The outlet of the CO2 absorption device is connected to an air stone via a flexible hose, and the air stone is placed in the aquaculture water.

[0021] During operation, the air compressor 1 draws in and compresses air through the air inlet 2. The compressed air then enters the saturated strongly alkaline solution layer 5 within the CO2 absorption device 4 via the air outlet pipe 3 and the first flexible hose 8. Under the influence of the airflow, the compressed air comes into full contact with the saturated strongly alkaline solution layer 5, and the CO2 in the air is absorbed by the saturated strongly alkaline solution layer 5. The gas after CO2 removal escapes from the saturated sodium hydroxide solution, is transported to the air stone via the outlet coil 6 and the flexible hose, and finally diffuses into the aquaculture water body 13 through the micropores of the air stone, achieving oxygenation while preventing CO2 from entering the water and causing a drop in pH.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An improved aeration device for preventing the decrease of pH value in aquaculture water, characterized in that, The device includes an air compressor (1) and a CO2 absorption device (4). The air compressor (1) is connected to an air inlet (2) and an air outlet (3). The air outlet (3) extends from the top of the CO2 absorption device (4) to a strongly alkaline solution layer (5) inside it. The top of the CO2 absorption device (4) is also provided with an outlet coil (6). A first hose (8) and a second hose (10) are connected to one terminal of the outlet coil (6). A first air stone (9) is connected to the end of the first hose (8), and a second air stone (11) is connected to the end of the second hose (10). The first air stone (9) and the second air stone (11) are placed in the aquaculture water (13) of the aquaculture tank (12).

2. The improved oxygenation device for preventing pH reduction in a culture water body according to claim 1, characterized by, The CO2 absorption device (4) is a sealed plastic container.

3. The improved aeration device for preventing the decrease of pH value in aquaculture water according to claim 1, characterized in that, The strongly alkaline solution layer (5) is a saturated sodium hydroxide solution layer, and the volume of the strongly alkaline solution layer (7) is 1 / 3 of the volume of the CO2 absorption device (4).

4. The improved oxygenation device for preventing pH reduction in a culture water body according to claim 1, characterized by, Both the first gas stone (9) and the second gas stone (11) are porous cylindrical structures.

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