Energy-saving type gas stripping circulating water culture system suitable for fry thickening

Abstract

The utility model discloses an energy-saving air-lift recirculating aquaculture system suitable for fry thickening, which comprises a square fry rearing tank, a microfilter, a biological filter tank, an ultraviolet sterilizer and a high-speed fan, and a water outlet of the biological filter tank is connected with a vertical pipe; an air outlet of the high-speed fan is connected with the bottom of the vertical pipe and is provided with a ball valve for control; the ultraviolet sterilizer is arranged on a water return pipe, and a water outlet of the water return pipe is connected with the other end of the square fry rearing tank. According to the system, on the premise of meeting normal circulating water treatment, foam can be removed at the same time, and the function of a protein separator is achieved; part of harmful gases such as carbon dioxide gas in the water body can be brought while a large amount of air is input, so that the function of a carbon dioxide degassing tower is realized; the whole water treatment system adopts an unpowered water pump design without water head damage, so that the energy consumption of the system is greatly reduced, the overall design is reasonable, the operation is convenient, and the installation and maintenance are simple.

Description

Technical Field

[0001] This utility model relates to the field of recirculating aquaculture technology, specifically an energy-saving airlift recirculating aquaculture system suitable for fish fry rearing. Background Technology

[0002] Factory-style circulating water treatment systems have been widely used in various aspects such as broodstock breeding, fry rearing, adult fish raising, and adult fish temporary holding. From the perspective of treatment systems, they generally have disadvantages such as large footprint, complex pipe connections, high equipment energy consumption (especially high water pump power), large equipment investment, and inconvenient management and operation. Especially for fry rearing systems, the water flow rate requirement is not that fast.

[0003] Based on this, this utility model proposes an energy-saving airlift recirculating aquaculture system suitable for fish fry rearing.

[0004] Citation 1: A Brief Discussion on Ultraviolet Disinfection Method for Water Treatment (China Science and Technology Expo). Citation 2: The Sterilization Effect of Ultraviolet Light on Recirculating Water in Aquaculture (Transactions of the Chinese Society of Agricultural Engineering). Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an energy-saving airlift recirculating aquaculture system suitable for fish fry rearing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving airlift recirculating aquaculture system suitable for fish fry rearing, comprising a square fish fry rearing tank, a microfilter, a biological filter box, an ultraviolet sterilizer, and a high-speed fan. The water outlet pipe of the square fish fry rearing tank is connected to the water inlet of the microfilter, the water outlet of the microfilter is connected to the water inlet of the biological filter box, and the water outlet of the biological filter box is connected to a vertical pipe.

[0007] The high-speed fan outlet is connected to a pipe, which is connected to the bottom of a vertical pipe and is controlled by a ball valve.

[0008] The top of the vertical pipe is equipped with a tee, which is connected to a return water pipe, a sewage pipe and an exhaust pipe respectively;

[0009] The ultraviolet sterilizer is installed on the return water pipe, and the outlet of the return water pipe is connected to the other end of the square fish fry rearing tank.

[0010] Preferably, the return water pipe is located at the lowest end of the side of the tee.

[0011] Preferably, the tee has a drain outlet in the middle of its side, and the drain outlet is connected to a drain pipe.

[0012] Preferably, the top of the tee is provided with a cap, the cap is provided with an air outlet, and the air outlet is connected to the exhaust pipe.

[0013] Preferably, the biofilter box is filled with suspended particulate biological filler.

[0014] Preferably, the air intake at the bottom of the vertical pipe is at least twice the water flow rate inside the vertical pipe.

[0015] Preferably, the height of the vertical pipe is four times the water pressure difference between the square fish fry rearing tank and the biological filter box.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention, through the system, can simultaneously remove foam and act as a protein separator while meeting the requirements of normal circulating water treatment. It can also act as a carbon dioxide degassing tower by inputting a large amount of air and removing some harmful gases such as carbon dioxide from the water.

[0018] The entire water treatment system adopts a pumpless design to prevent head damage, which greatly reduces system energy consumption. The overall design is reasonable, easy to operate, and simple to install and maintain. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the principle of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0022] In the diagram: 1. Square fish fry rearing tank; 2. Microfilter; 3. Biological filter box; 31. Biological packing material; 4. Ultraviolet sterilizer; 5. High-speed fan; 51. Pipe; 6. Vertical pipe; 61. T-junction; 611. Drain outlet; 62. Pipe cap; 621. Air outlet; 7. Drain pipe; 8. Exhaust pipe; 9. Return water pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-3This utility model provides a technical solution: an energy-saving airlift recirculating aquaculture system suitable for fish fry rearing, including a square fish fry rearing tank 1, a microfilter 2, a biological filter box 3, an ultraviolet sterilizer 4, and a high-speed fan 5. The water outlet pipe of the square fish fry rearing tank 1 is connected to the water inlet of the microfilter 2, the water outlet of the microfilter 2 is connected to the water inlet of the biological filter box 3, and the water outlet of the biological filter box 3 is connected to a vertical pipe 6; the high-speed fan 5 can be a low-noise high-speed aerator.

[0025] The air intake at the bottom of vertical pipe 6 is at least twice the water flow rate inside vertical pipe 6.

[0026] The height of the vertical pipe 6 is 4 times the water pressure difference between the square fish fry rearing tank 1 and the biological filter box 3.

[0027] The biological filter box 3 is filled with suspended particulate biological filler 31.

[0028] like Figure 1 As shown, the square fish fry rearing tank 1 can be a square hatching tank, and the microfilter 2 can be a box-type microfilter.

[0029] A square fry rearing tank 1 contains 20kg / m³ of fish fry. The outlet of the tank is located at one end of the tank. The water is introduced into a microfilter 2 through a pipe using the water pressure difference. The microfilter 2 uses a filter screen to physically filter out large particles of uneaten feed and feces. The clean water after filtration by the microfilter 2 then enters a biological filter box 3. The biological filter box 3 is filled with suspended particulate biological filler 31, which is covered with a large number of nitrifying bacteria. This effectively removes toxic substances such as ammonia nitrogen and nitrite produced by uneaten feed and feces. The outlet of the biological filter box 3 is connected to a vertical pipe 6, and the purified water is returned to the square fry rearing tank 1 through the vertical pipe 6.

[0030] The outlet of the high-speed fan 5 is connected to a pipe 51, which is connected to the bottom of the vertical pipe 6 and is controlled by a ball valve.

[0031] The top of the vertical pipe 6 is equipped with a tee 61, which is connected to the return water pipe 9, the sewage pipe 7 and the vent pipe 8 respectively; the inlet of the return water pipe 9 is connected to the tee 61.

[0032] The ultraviolet sterilizer 4 is installed on the return water pipe 9, and the outlet of the return water pipe 9 is connected to the other end of the square fish fry rearing tank 1. For example, the pipe through which the return water pipe 9 flows to the ultraviolet sterilizer 4 is made of a transparent material, which facilitates the effective sterilization of the water by ultraviolet light. The ultraviolet sterilizer 4 is a commonly used sterilizer in this field, and this utility model does not provide a detailed description of the structure of the ultraviolet sterilizer 4.

[0033] The return water pipe 9 is located at the bottom of the side of the tee 61.

[0034] The side of the tee 61 is provided with a drain outlet 611, which is connected to the drain pipe 7.

[0035] The top of the tee 61 is equipped with a cap 62, and the cap 62 has an outlet 621, which is connected to the exhaust pipe 8. Figure 1 As shown, the outlet pipe of the three-way valve 61 is connected to the inlet of the return water pipe 9. After the ultraviolet sterilizer sterilizes the water flowing through the return water pipe 9, it flows into the square hatching tank 1. The water in the square hatching tank 1 passes sequentially through the microfilter 2, the biological filter box 3, and the return water pipe 9 (sterilized by the ultraviolet sterilizer 4) before returning to the square hatching tank 1. The water in the entire recirculating aquaculture system is continuously circulated by the high-speed fan 5, meaning that the water is continuously sterilized by the ultraviolet sterilizer.

[0036] The power for water flow comes from the air volume generated by the high-speed fan 5. The air volume generated by the high-speed fan 5 is connected to the bottom of the vertical pipe 6 between the biological filter box 3 and the square fish fry rearing tank 1 through the pipe 51. The air blows upward, causing the water to flow upward. The water passes through the ultraviolet sterilizer 4, which kills pathogenic microorganisms in the aquaculture water, and then returns to the other end of the square fish fry rearing tank 1. The high-speed fan 5 is a low-energy-consumption, high-volume variable frequency energy-saving fan that can supply one or more systems simultaneously. It can be automatically frequency-controlled according to the air volume to achieve energy saving. The air intake volume generated by the high-speed fan 5 can be controlled by a pipe ball valve to ensure that the air volume and the circulating water volume are at least 2:1 to drive the water upward. At the same time, the foam generated by the upward movement of water and gas can be discharged through the drain outlet 611 into the drain pipe 7 and further discharged to the outdoor wastewater treatment plant. Meanwhile, the large amount of air input will also carry out some harmful gases such as carbon dioxide in the water, which will be discharged through the air outlet 621 into the exhaust pipe 8 and further discharged outdoors. The water level pressure difference between the square fish fry rearing tank 1 and the biological filter box 3 is controlled within the range of about 30-50cm, so the height of the vertical pipe 6 is about 120cm-200cm.

[0037] This system is also suitable for high-density adult fish farming, where the adult fish can reach 60kg / m³ (freshwater California bass, etc.). This system is a pumpless water system without head damage. This system does not have a water pump; it uses gas to drive the water flow and circulate the water, saving water pump energy consumption. The flow rate can reach 240m³ / h.

[0038] Working principle and usage process of this utility model:

[0039] The aquaculture water enters the microfilter 2 through a pipe using the water level pressure difference. The microfilter 2's filter screen physically filters out large particles of uneaten feed and feces. The clean water after filtration by the microfilter 2 further enters the biological filter box 3, which is filled with suspended particulate biological filler 31. A large number of nitrifying bacteria are attached to the filler, which can effectively remove toxic substances such as ammonia nitrogen and nitrite produced by uneaten feed and feces. The outlet of the biological filter box 3 is connected to a vertical pipe 6, and the purified water returns to the square fry rearing tank 1 through the vertical pipe 6. The water flow is powered by the air volume generated by the high-speed fan 5. The air volume generated by the high-speed fan 5 is connected to the bottom of the vertical pipe 6 between the biological filter box 3 and the square fry rearing tank 1 through a pipe 51, blowing air upwards and causing the water to flow upwards. The water then passes through the ultraviolet sterilizer 4, which kills pathogenic microorganisms in the aquaculture water, and returns to the other end of the square fry rearing tank 1. The high-speed fan 5 is a low-energy-consumption, high-volume variable frequency energy-saving fan that can supply one or more systems simultaneously. It can be automatically frequency-controlled according to the air volume to achieve energy saving. The air intake volume generated by the high-speed fan 5 can be controlled by the pipeline ball valve to ensure that the air volume and the circulating water volume are at least 2:1 to drive the water upward. At the same time, the foam generated by the upward movement of water and gas can be discharged through the drain outlet 611 into the drain pipe 7 and further discharged to the outdoor tailwater treatment plant. Meanwhile, the large amount of air input will also carry out some harmful gases such as carbon dioxide in the water, which will be discharged through the air outlet 621 into the exhaust pipe 8 and further discharged outdoors.

[0040] Citation 1 discloses that "the principle of ultraviolet sterilization is to use ultraviolet light of appropriate wavelengths to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in the cells of microorganisms, causing growth-related cell death and regenerative cell death, thereby achieving the effect of sterilization and disinfection."

[0041] Reference document 2 states that "the daily sterilization multiple increases with the increase of the daily circulation number, but the increase is not significant when the daily circulation number is very large. Therefore, to obtain a high daily sterilization multiple, the number of circulations per day must be maintained at a certain level. In recirculating aquaculture systems, the water circulation rate of nitrifying bacteria biofilters is usually once every 0.5 to 1.0 hours." It further states that "in a recirculating aquaculture system, the ultraviolet input power, the circulating water flow rate, and the transmittance of 254nm ultraviolet light in the water are three important factors affecting the ultraviolet sterilization effect. The higher the ultraviolet input power per unit volume of water, the better the sterilization effect; the higher the flow rate of water through the ultraviolet lamp sterilizer, the greater the overall sterilization effect; and the higher the 254nm ultraviolet transmittance, the better the sterilization effect."

[0042] As can be seen from the above cited documents, in a recirculating aquaculture system, the water is constantly circulating, and pathogens in the water can be killed by ultraviolet sterilizers.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving airlift recirculating aquaculture system suitable for fish fry rearing, comprising a square fish fry rearing tank (1), a microfilter (2), a biological filter box (3), an ultraviolet sterilizer (4), and a high-speed fan (5), characterized in that: The water outlet pipe of the square fish fry rearing tank (1) is connected to the water inlet of the microfilter (2), the water outlet of the microfilter (2) is connected to the water inlet of the biological filter box (3), and the water outlet of the biological filter box (3) is connected to a vertical pipe (6). The outlet of the high-speed fan (5) is connected to a pipe (51), which is connected to the bottom of the vertical pipe (6) and is controlled by a ball valve. The top of the vertical pipe (6) is provided with a tee (61), which is connected to a return water pipe (9), a sewage pipe (7) and an exhaust pipe (8) respectively. The ultraviolet sterilizer (4) is installed on the return water pipe (9), and the outlet of the return water pipe (9) is connected to the other end of the square fish fry rearing tank (1).

2. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The return water pipe (9) is located at the lowest end of the side of the tee (61).

3. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The tee (61) has a drain outlet (611) in the middle of its side, and the drain outlet (611) is connected to the drain pipe (7).

4. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The top of the tee (61) is provided with a cap (62), and the cap (62) is provided with an air outlet (621), which is connected to the exhaust pipe (8).

5. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The biological filter box (3) is filled with suspended particulate biological filler (31).

6. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The air intake at the bottom of the vertical pipe (6) is at least twice the water flow rate inside the vertical pipe (6).

7. The energy-saving airlift recirculating aquaculture system suitable for fish fry rearing as described in claim 1, characterized in that: The height of the vertical pipe (6) is 4 times the water pressure difference between the square fish fry rearing tank (1) and the biological filter box (3).

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