Sand-free recirculating aquaculture system for babylonia lutosa

Abstract

The utility model provides a babylonia sand-free recirculating aquaculture system which comprises a self-pollution-discharge sand-free aquaculture pond and a low-level water treatment system, aquaculture tail water of the self-pollution-discharge sand-free aquaculture pond automatically flows into the low-level water treatment system to be subjected to particle three-level purification, and then the purified tail water is pumped into the self-pollution-discharge sand-free aquaculture pond through a water pump; babylonia breeding nests for allowing Babylonia to inhabit are arranged in the self-pollution-discharge sand-free breeding ponds, and automatic pollution discharge devices are installed at the bottoms of the self-pollution-discharge sand-free breeding ponds. The low-level water treatment system comprises a particulate matter three-stage removal device and a pipeline type ultraviolet sterilization device which are connected in sequence, and the particulate matter three-stage removal device is composed of a vertical flow sedimentation tank, a foam separation tank and a sand filter tank which are connected in sequence. The utility model effectively solves the problems that the traditional sand flowing water culture is high in water consumption, more in sand matrix dirt accumulation, easy in disease outbreak, incapable of carrying out industrial culture and the like, and has the advantages of high water-saving efficiency, good dirt collecting and discharging effects, controllable culture environment, few diseases, high culture efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the aquaculture of Babylonia areolata, and particularly to a sand-free circulating water aquaculture system for Babylonia areolata. Background Art

[0002] Babylonia areolata is considered to be one of the most promising marine aquaculture improved varieties in the 21st century, and is mainly distributed in the southeast coast of China, as well as regions such as Southeast Asia and Japan. The suitable aquaculture temperature of Babylonia areolata is between 23°C and 30°C, and the salinity adaptation range is 14-34. If the salinity is lower than 12, a large number of deaths will occur. These factors limit the aquaculture production of Babylonia areolata to coastal areas such as Hainan, Guangdong, and Fujian in China. Currently, due to the lack of stable excellent varieties, mature artificial compound feeds, and successful circulating water aquaculture systems for Babylonia areolata, problems such as low aquaculture survival rate, frequent diseases, large water consumption, and serious bottom sediment pollution are very prominent. In particular, in the sand-based flowing water aquaculture, it is necessary to continuously pump inshore seawater for water replacement, oxygen supplementation, and water quality improvement. The daily water replacement volume is as high as 16 times. Since the water quality of inshore seawater fluctuates greatly affected by typhoons, rainfall, etc., it is impossible to guarantee stable aquaculture water quality, often resulting in frequent diseases and high mortality rates. At the same time, the "large discharge and large release" aquaculture method also does not meet the requirements of ecological construction and the goal of sustainable industrial development. Summary of the Invention

[0003] The present invention provides a sand-free circulating water aquaculture system for Babylonia areolata. The sand-free circulating water aquaculture system for Babylonia areolata includes a number of self-pollution-discharging sand-free aquaculture ponds and a low-position water treatment system lower than the self-pollution-discharging sand-free aquaculture ponds. The aquaculture tail water of the self-pollution-discharging sand-free aquaculture ponds flows into the low-position water treatment system for purification by itself, and then the purified tail water is pumped into the self-pollution-discharging sand-free aquaculture ponds through a water pump.

[0004] In the self-pollution-discharging sand-free aquaculture pond, there is a Babylonia areolata aquaculture nest for Babylonia areolata to inhabit. The side wall of the self-pollution-discharging sand-free aquaculture pond is configured with a plurality of water inlets to form a water flow rotation. The water inlets are connected to the water pump through a water inlet pipeline. The bottom plate of the self-pollution-discharging sand-free aquaculture pond inclines towards the center and an automatic sewage discharge device is installed at the center position. The tail water flows into the low-position water treatment system through the automatic sewage discharge device.

[0005] The low-position water treatment system includes a three-stage particulate removal device and a pipeline-type ultraviolet sterilization device connected in sequence. The three-stage particulate removal device is composed of a vertical flow sedimentation tank, a foam separation tank, and a sand filter tank connected in sequence. The vertical flow sedimentation tank, the foam separation tank, and the sand filter tank are respectively provided with a sediment water sewage discharge pipe, a foam sewage discharge pipe, and a backwash water sewage discharge pipe. The sediment water sewage discharge pipe, the foam sewage discharge pipe, and the backwash water sewage discharge pipe are all connected to a sewage discharge main pipe. The water outlet of the pipeline-type ultraviolet sterilization device is connected to the water pump.

[0006] Further, the self-pollution-discharge sand-free culture pond is a 4m×4m square pond made of PP material. A bracket and a 50-mesh screen are installed in the self-pollution-discharge sand-free culture pond above the automatic pollution-discharge device. An oriental whelk culture nest is installed above the bracket, and the 50-mesh screen is fixed to the bracket.

[0007] Further, one water inlet is installed at each of the four corners of the inner wall of each self-pollution-discharge sand-free culture pond, and a clockwise spiral water flow is formed in the self-pollution-discharge sand-free culture pond through the four water inlets.

[0008] Further, the oriental whelk culture nest is a nest-shaped structure made of PVC material stacked in at least one layer, and the nest-shaped structure is densely provided with square openings with side lengths of 3-4 cm in space.

[0009] Further, the automatic pollution-discharge device includes a double pollution-discharge device, a return pipe and a solenoid valve. The double pollution-discharge device is a composite structure composed of a spiral sewage collection pipe and a direct-current water outlet pipe.

[0010] The direct-current water outlet pipe is connected to the particulate matter three-stage removal device through the return pipe. The diameter of the direct-current water outlet pipe is 1 / 2-1 / 3 of the total return pipe. The spiral sewage collection pipe is connected to the sewage main pipe, and a solenoid valve is installed on the spiral sewage collection pipe.

[0011] Further, the pipeline-type ultraviolet sterilization device is provided with a detachable ultraviolet light source with a wavelength of 253.7 nm.

[0012] Further, it also includes a purified water makeup water system 130 connected to the water inlet pipeline 141, and the purified water makeup water system 130 is used to supplement purified water additionally.

[0013] Further, the low-level water treatment system also includes a jet injector connected to the water inlet pipeline. The output end of the jet injector is located in the bottom water storage area of the self-pollution-discharge sand-free culture pond. The water and gas are mixed through the jet injector and then transported to the water storage area of the self-pollution-discharge sand-free culture pond. The flow rate of the jet injector is greater than 0.015m 3 / s, and the ratio of the end face diameter to the pipe length of the mixing chamber is 0.2-0.5.

[0014] Further, the low-level water treatment system also includes an aeration device, and the aeration device is provided with an air diffuser pipe located in the water storage area of the self-pollution-discharge sand-free culture pond;

[0015] The water inlet is located above the water surface of the self-pollution-discharge sand-free culture pond.

[0016] Further, the sewage main pipe is connected to the sewage well;

[0017] The number of vertical flow sedimentation tanks and sand filter tanks is multiple.

[0018] The sand-free circulating water culture system for Babylonia areolata of the present invention comprises a self-sewage-discharging sand-free culture pond, a Babylonia areolata culture nest, an automatic double-sewage-discharging system, a three-stage particulate removal device, an ultraviolet sterilization and disinfection device, a steam-water mixing water distribution system (ejector or aeration device) and an intelligent control system. It effectively solves the problems of large water consumption in traditional sand-containing flowing water culture, much accumulation of sand matrix dirt, easy outbreak of diseases and inability to carry out industrialized culture, etc. It has the advantages of high water-saving efficiency, good sewage collection and discharge effect, controllable culture environment, few diseases and high culture efficiency, and solves the key problems of facility culture of Babylonia areolata. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0020] Figure 1 It is a composition schematic diagram of a sand-free circulating water culture system for Babylonia areolata provided in Embodiment 1 of the present invention;

[0021] Figure 2 Top view of the sand-free circulating water culture system for Babylonia areolata in Embodiment 1 of the present invention

[0022] Figure 3 It is a schematic diagram showing that water inlet ports are arranged at the four corners of the culture pond to achieve swirling water inlet in Embodiment 1 of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a Babylonia areolata culture nest in Embodiment 2;

[0024] Figure 5 It is a schematic structural diagram of a Babylonia areolata culture nest in Embodiment 3; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some well-known technical features in the art are not described.

[0026] In order to thoroughly understand the present invention, detailed steps and detailed structures will be presented in the following description to explain the technical solutions of the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention can also have other embodiments.

[0027] Embodiment 1

[0028] Reference Figures 1-4 As shown, the present invention provides a sand-free circulating water aquaculture system for Babylonia areolata. The sand-free circulating water aquaculture system for Babylonia areolata includes a number of self-draining sand-free aquaculture ponds 100, a low-level water treatment system 200 lower than the self-draining sand-free aquaculture ponds 100, and an intelligent control system. The aquaculture tail water of each self-draining sand-free aquaculture pond 100 flows into the low-level water treatment system 200 by gravity for purification, and then the purified tail water is pumped into the self-draining sand-free aquaculture pond 100 by a water pump 230.

[0029] Self-draining sand-free aquaculture pond 100

[0030] Each sewage aquaculture pond 100 is a 4m×4m square pond made of PP material. A bracket and a 50-mesh screen 102 are installed inside the self-draining sand-free aquaculture pond 100 on top of the automatic sewage discharge device 120. An aquaculture nest 110 for Babylonia areolata is installed above the bracket, and the 50-mesh screen 102 is fixed to the bracket.

[0031] In an optional embodiment, the aquaculture nest is a nest-shaped structure made of PVC material stacked in at least one layer, and the side length of the nest opening is 3-4 cm.

[0032] The side wall of the self-draining sand-free aquaculture pond 100 is provided with a plurality of water inlets 140. The water inlets 140 are connected to the water pump 230 through a water inlet pipeline 141. The water treated by the low-level water treatment system 200 is pumped into the self-draining sand-free aquaculture pond 100 by the water pump 230.

[0033] The water inlet pipeline 141 is also connected to a makeup water system 130. The makeup water system 130 is used to supplement water to the aquaculture system additionally to maintain the total water volume of the aquaculture system. In two different embodiments, the water inlets 140 on the side wall of the self-draining sand-free aquaculture pond 100 are respectively located above the water storage area.

[0034] The bottom plate of the self-draining sand-free aquaculture pond 100 slopes towards the center and an automatic sewage discharge device 120 is installed at the center position. The tail water flows into the low-level water treatment system 200 through the automatic sewage discharge device 120.

[0035] The automatic sewage discharge device 120 includes a double sewage discharge device 121, a return pipe 122 and a solenoid valve 123. The double sewage discharge device 121 is a composite structure composed of a spiral sewage collection pipe 121-1 and a direct current outlet pipe 121-2. The direct current outlet pipe 121-2 is connected to a particulate matter three-stage removal device 210 through the return pipe 122. The diameter of the direct current outlet pipe 121-2 is 1 / 2-1 / 3 of the total return pipe. The spiral sewage collection pipe 121-1 is connected to a sewage main pipe 300, and a solenoid valve 123 is installed on the spiral sewage collection pipe 121-1.

[0036] Low-level water treatment system 200

[0037] The low-level water treatment system 200 includes a three-stage particulate removal device 210 and a pipeline ultraviolet sterilization device 220 connected in sequence. The three-stage particulate removal device 210 is provided with a sediment drain port and is connected to the main drain pipe 300. The three-stage particulate removal device 210 is composed of a vertical flow sedimentation tank 211, a foam separation tank 212, and a sand filter tank 213 connected in sequence. The vertical flow sedimentation tank 211, the foam separation tank 212, and the sand filter tank 213 are also respectively provided with a sediment water drain pipe 214, a foam drain pipe 215, and a backwash water drain pipe 216. The sediment water drain pipe 214, the foam drain pipe 215, and the backwash water drain pipe 216 are all connected to the main drain pipe 300, and the main drain pipe 300 is connected to the drain well 310.

[0038] In an optional embodiment, the number of both the vertical flow sedimentation tank 211 and the sand filter tank 213 is multiple.

[0039] Multiple vertical flow sedimentation tanks 211 are arranged in series in sequence to increase the treatment capacity, disperse the water flow pressure, and improve the sedimentation efficiency. A central water inlet pipe is provided inside each vertical flow sedimentation tank 211. After the water enters from the central water inlet pipe, an upward water flow is formed in the tank. Under the action of gravity, the heavier particulate matters quickly settle to the bottom of the tank and are discharged through the sediment drain port at the bottom. At the same time, in order to maintain the stability of the water flow in the tank, the side wall of the vertical flow sedimentation tank 211 is designed with a water outlet groove, and the preliminarily purified water flows into the foam separation tank 212 from the water outlet groove.

[0040] The foam separation tank 212 uses the adhesion effect of bubbles to remove the suspended solids and dissolved organic matters in the water body. A microporous aeration device is provided in the tank to generate a large number of tiny bubbles. These bubbles combine with the suspended solids and organic matters in the water body during the rising process, form foam and float to the water surface, and finally are discharged through the foam drain pipe 215. The design of the foam separation tank 212 effectively reduces the burden on the subsequent treatment units and improves the overall treatment efficiency.

[0041] As the last line of defense for the three-stage particulate removal, the sand filter tank 213 is filled with filter materials such as high-quality quartz sand or activated carbon. The water treated by the vertical flow sedimentation tank 211 and the foam separation tank 212 enters the sand filter tank 213. Through the adsorption and interception effects of the filter materials, the remaining suspended solids, organic matters, and some microorganisms are further removed. The sand filter tank 213 adopts a backwashing technology and is regularly flushed using the backwash water drain pipe 216 to prevent the filter materials from being blocked and maintain a long-term stable filtering effect.

[0042] The pipeline ultraviolet sterilization device 220 is closely connected after the sand filter tank 213. Using the strong sterilization ability of ultraviolet rays, it quickly kills bacteria, viruses, and other microorganisms in the water body to ensure water quality safety. This device is made of stainless steel material, has strong corrosion resistance, and the ultraviolet lamp tube is easy to replace, making maintenance convenient.

[0043] In addition, in order to monitor and adjust the water quality in real time, the low-level water treatment system 200 is also equipped with an on-line water quality monitoring system (not shown in the figure), which can detect key indicators such as dissolved oxygen, pH value, ammonia nitrogen, nitrite, etc. in the water in real time, and automatically adjust parameters such as the water pump flow rate and aeration volume according to the detection results to ensure that the water quality is always in the best state.

[0044] In an optional embodiment, the pipeline type ultraviolet sterilization device 220 is provided with an ultraviolet light source with a detachable wavelength of 253.7 nm.

[0045] Intelligent control system

[0046] It is mainly composed of devices such as water quality detection, circuit control, feeding control, and disease behavior observation, and is used for detecting water quality, controlling sewage discharge, predicting snail diseases, monitoring the operation status of equipment, etc., and has on-site or remote control functions.

[0047] Embodiment 2

[0048] On the basis of Embodiment 1, the low-level water treatment system 200 of this embodiment further includes a jet injector 240 connected to the water inlet pipeline 141. As Figure 3 shown, the output end of the jet injector 240 is located in the bottom water storage area of the self-cleaning sand-free aquaculture pond 100, that is, the water inlet 140 on the side wall of the self-cleaning sand-free aquaculture pond 100 is located within the water storage area. The water and gas are mixed by the jet injector 240 and then transported to the water storage area of the self-cleaning sand-free aquaculture pond 100. As an efficient water-gas mixing device, the jet injector 240 fully mixes the water in the water inlet pipeline 141 with air or pure oxygen to form an oxygen-rich water flow. This oxygen-rich water flow is directly injected into the water storage area of the self-cleaning sand-free aquaculture pond 100 through the water inlet 140, which can not only quickly supplement the dissolved oxygen in the water body and provide a more suitable living environment for aquatic organisms, but also break the water stratification through the disturbance of the bubbles and promote the exchange of the upper and lower water layers, making the water quality more uniform and stable.

[0049] In addition, the application of the jet injector 240 also has a certain energy-saving effect. Since the density of the water flow after gas-liquid mixing decreases, the falling speed of the same volume of water flow under the action of gravity will be correspondingly slowed down, thereby prolonging the residence time of the water flow in the aquaculture pond, enabling the dissolved oxygen to dissolve more fully in the water, and reducing the waste of dissolved oxygen caused by too fast water flow. At the same time, the disturbance of the bubbles also enhances the self-purification ability of the water body, helps to reduce the accumulation of harmful substances generated during the aquaculture process, and improves the overall health level of the aquaculture system.

[0050] In the second embodiment, the water inlet 140 on the side wall of the self-draining sand-free aquaculture pond 100 is located within the water storage area. Such a design enables the oxygen-rich water flow to directly act on the aquaculture organisms, improving their growth rate and survival rate. At the same time, due to the uniform distribution of the water flow in the water storage area, the risk of damage to the aquaculture organisms caused by water flow scouring and the deterioration of the aquaculture environment is also reduced.

[0051] In one embodiment, the flow rate of the ejector 240 is 0.015 m 3 / s, and the ratio of the end face diameter to the pipe length of the mixing chamber is 0.2 - 0.5.

[0052] Embodiment Three

[0053] In an alternative embodiment, the low-level water treatment system 200 further includes an aeration device. As Figure 4 shown, the aeration device is provided with an aeration pipe 250 located in the water storage area of the self-draining sand-free aquaculture pond 100, and bubbles are evenly distributed into the water storage area through the aeration pipe 250 to achieve effective aeration of the water body. The aeration device can not only increase the dissolved oxygen content in the water body and improve the living environment of aquaculture organisms, but also further promote the suspension and diffusion of suspended substances in the water body through the agitation of the bubbles, which is beneficial to the smooth progress of subsequent treatment steps.

[0054] The aeration pipe 250 adopts micro-porous aeration technology to ensure that the bubbles are small and evenly distributed, improving the oxygen utilization efficiency. The aeration pipe is arranged at the bottom of the aquaculture pond and works in coordination with the automatic sewage discharge device 120 to form a complete set of circulation and purification systems. When the automatic sewage discharge device 120 discharges sediments and part of the polluted water body, the aeration pipe 250 timely replenishes fresh oxygen to maintain the ecological balance of the water quality in the aquaculture pond.

[0055] In this embodiment, the water inlet 140 on the side wall of the self-draining sand-free aquaculture pond 100 is located above the water storage area.

[0056] In summary, the advantages of the present invention are as follows:

[0057] 1) Through the vertically-flowing sedimentation tank, foam separation tank, sand filter tank, and pipeline-type ultraviolet sterilization device connected in series in sequence, the low-level water treatment system of the present invention constructs an all-round and multi-level water quality purification system. This system can not only effectively remove suspended substances, dissolved organic matter, and microorganisms in the water body, but also significantly improve the water quality to meet the direct discharge standard.

[0058] 2) The introduction of the intelligent control system has enabled the entire aquaculture system to achieve comprehensive intelligentization from water quality detection to equipment control. By real-time monitoring of key indicators in the water and automatically adjusting parameters such as the flow rate of water pumps and aeration volume, the system can ensure that the water quality is always in the best state. In addition, the intelligent control system also has on-site or remote control functions, enabling managers to grasp the operation status of the system at any time and respond promptly to possible problems.

[0059] 3) The present invention integrates a variety of water treatment technologies into a compact low-position water treatment system, achieving high efficiency and integration of water quality purification. This integrated design not only saves space but also facilitates the maintenance and management of the system. At the same time, the coordinated operation of each treatment unit ensures the continuity and stability of water quality treatment.

[0060] 4) With the help of ejectors or aeration devices, not only the dissolved oxygen content in the water body is increased, but also the energy consumption and cost in the aquaculture process are reduced through their energy-saving effects. The ejector realizes efficient dissolved oxygen supplementation through gas-water mixing technology, while the aeration device improves the utilization efficiency of oxygen through microporous aeration technology. Together, they construct an environmentally friendly and energy-saving aquaculture environment.

[0061] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A sand-free circulating water aquaculture system for Babylonia areolata, characterized in that, The babylonia areolata sand-free circulating water aquaculture system includes a number of self-sewage-discharging sand-free aquaculture ponds (100) and a low-position water treatment system (200) lower than the self-sewage-discharging sand-free aquaculture ponds (100). The aquaculture tail water of the self-sewage-discharging sand-free aquaculture ponds (100) flows into the low-position water treatment system (200) for purification, and then the purified tail water is pumped into the self-sewage-discharging sand-free aquaculture ponds (100) by a water pump (230). Inside the self-sewage-discharging sand-free aquaculture pond (100), there is a babylonia areolata aquaculture nest (110) for babylonia areolata to inhabit. The side wall of the self-sewage-discharging sand-free aquaculture pond (100) is configured with a plurality of water inlets (140). The water inlets (140) are connected to the water pump (230) through a water inlet pipeline (141). The bottom plate of the self-sewage-discharging sand-free aquaculture pond (100) slopes towards the center and an automatic sewage discharge device (120) is installed at the center position. The tail water flows into the low-position water treatment system (200) through the automatic sewage discharge device (120). The low-position water treatment system (200) includes a particulate matter three-stage removal device (210) and a pipeline type ultraviolet sterilization device (220) connected in sequence. The particulate matter three-stage removal device (210) is composed of a vertical flow sedimentation tank (211), a foam separation tank (212) and a sand filter tank (213) connected in sequence. The vertical flow sedimentation tank (211), the foam separation tank (212) and the sand filter tank (213) are respectively provided with a sediment water sewage discharge pipe (214), a foam sewage discharge pipe (215), and a backwash water sewage discharge pipe (216). The sediment water sewage discharge pipe (214), the foam sewage discharge pipe (215), and the backwash water sewage discharge pipe (216) are all connected to a sewage discharge main pipe (300). The water outlet of the pipeline type ultraviolet sterilization device (220) is connected to the water pump (230).

2. The Turbo cornutus sand-free circulating water aquaculture system according to claim 1, wherein The self-sewage-discharging sand-free aquaculture pond (100) is a 4m×4m square pond made of PP material. Inside the self-sewage-discharging sand-free aquaculture pond (100), there is a bracket and a 50-mesh screen (102) located on top of the automatic sewage discharge device (120). The babylonia areolata aquaculture nest (110) is installed on the upper part of the bracket, and the 50-mesh screen is fixed on the bracket.

3. The Turbo cornutus sand-free recirculating aquaculture system according to claim 2, wherein One water inlet (140) is installed at each of the four corners of the inner wall of each self-sewage-discharging sand-free aquaculture pond (100), and spiral water inlet in the clockwise direction is formed in the self-sewage-discharging sand-free aquaculture pond (100) through the four water inlets (140).

4. The Turbo cornutus sand-free circulating water aquaculture system according to claim 2, characterized in that, The babylonia areolata aquaculture nest (110) is a nest-like structure made of PVC material stacked in at least one layer, and the nest-like structure is densely provided with square openings with side lengths of 3-4 cm in space.

5. The Turbo cornutus sand-free circulating water aquaculture system according to claim 1, characterized in that, The automatic sewage discharge device (120) includes a double sewage discharge device (121), a return water pipe (122) and an electromagnetic valve (123). The double sewage discharge device (121) is a composite structure composed of a spiral sewage collection pipe (121-1) and a direct current water outlet pipe (121-2). The DC outlet pipe (121-2) is connected to the particulate matter three-stage removal device (210) through a return pipe (122). The diameter of the DC outlet pipe (121-2) is 1 / 2 to 1 / 3 of the total return pipe. The spiral sewage collection pipe (121-1) is connected to the sewage discharge main pipe (300), and a solenoid valve (123) is installed on the spiral sewage collection pipe (121-1).

6. The sand-free circulating water breeding system for babylonia areolata according to claim 1, characterized in that, The pipeline type ultraviolet sterilization device (220) is provided with a detachable ultraviolet light source with a wavelength of 253.7 nm.

7. The Turbo cornutus sand-free circulating water aquaculture system according to claim 3, wherein It further includes a purified water make-up water system (130) connected to the water inlet pipeline (141), and the purified water make-up water system (130) is used to additionally supplement purified water.

8. The sand-free circulating water breeding system for Babylonia areolata according to claim 1 or 7, characterized in that The low-level water treatment system (200) further includes an ejector (240) connected to the water inlet pipeline (141), and the output end of the ejector (240) is located in the bottom water storage area of the self-pollution-discharging sand-free aquaculture pond (100). After mixing water and gas through the ejector (240), the mixture is transported to the water storage area of the self-pollution-discharging sand-free aquaculture pond (100). The flow rate of the ejector (240) is 0.015 m 3 / s, and the ratio of the end face diameter to the pipe length of the mixing chamber is 0.2 - 0.

5.

9. The Turbo cornutus sand-free circulating water aquaculture system according to claim 1, characterized in that, The low-position water treatment system (200) further includes an aeration device, and the aeration device is provided with an aeration pipe (250) located in the water storage area of the self-sewage non-sand aquaculture pond (100); The water inlet (140) is located above the water surface of the self-sewage non-sand aquaculture pond (100).

10. The Turbo cornutus sand-free circulating water aquaculture system according to claim 1, wherein, The sewage discharge main pipe (300) is connected to a sewage well (310); The number of the vertical flow sedimentation tanks (211) and the sand filter tanks (213) is multiple.

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