A circulating water culture system for Japanese prawn

Abstract

The present application belongs to the technical field of industrial circulating water aquaculture, and particularly relates to a Japanese prawn circulating water aquaculture system. The system comprises a prawn aquaculture pond and an external water treatment device, and the external water treatment device is composed of a drum type microfilter, a three-stage biological filter, a protein separator and a pipeline type ultraviolet sterilizer. The prawn aquaculture pond comprises a pond body, a flow guide support, a prawn plate, a water outlet, an inlet pipe, a nano aeration pipe and a sewage discharge structure. The flow guide support is located at the bottom of the pond and is used for guiding water and sewage and supporting the prawn plate; the inlet pipe and the nano aeration pipe are arranged in the prawn plate, and the bottom of the prawn plate is paved with bottom sand for the prawns to inhabit; and the sewage discharge structure is located at the bottom of the pond body and the water outlet, and is internally provided with a cutting type sewage pump. The present application realizes effective flow guiding of prawn shells, residual feed and feces, and at the same time, most of the water and sewage are discharged through separate pipes, and together with a series of subsequent water treatment devices, the present application provides good water quality guarantee for the growth and development of Japanese prawns.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of industrialized recirculating aquaculture, and particularly relates to a Japanese prawn recirculating aquaculture system. TECHNICAL BACKGROUND

[0002] Prawn culture is a pillar industry of aquaculture in China. In 2021, the prawn culture yield in China was 1.65 million tons, accounting for about 25% of the world's prawn culture yield. At present, the prawn culture in China mainly includes pond culture, high-position pool flow water culture and semi-closed recirculating aquaculture. Although the prawn culture in China has reached an international leading level in yield and scale, the increasing demand for prawns in the market and other problems have greatly affected the further development of the prawn culture industry.

[0003] The recirculating aquaculture mode is an advanced representative of industrialized aquaculture technology, which refers to a series of water treatment technologies such as physical filtration, biological filtration, sterilization and disinfection, and degassing and oxygenation, to remove suspended particulate matter, ammonia nitrogen, nitrite nitrogen and other organic and inorganic substances in the culture water that are harmful to the culture organisms, so as to purify the water body and achieve the purpose of recycling. The recirculating aquaculture system realizes the recycling of the culture water body, greatly reduces the discharge of culture tail water, and solves the resource and environmental problems that restrict the development of the aquaculture industry.

[0004] Japanese prawn (Penaeus japonicus) belongs to Arthropoda, Malacostraca, Decapoda and Penaeidae, and is widely distributed in the Pacific Ocean and the Indian Ocean. It is also distributed in the coastal areas south of Jiangsu, China. Japanese prawn has the characteristics of rapid growth, strong disease resistance, long dry survival time, high survival rate during long-distance transportation, etc. In addition, it has delicious meat and good taste, so its market price is relatively high. It has become an important variety for prawn culture in coastal areas of China. Japanese prawn has strong sand burying characteristics, and hides in the sand during the day and comes out of the sand layer at night to feed, so a 15-20cm sand layer needs to be laid at the bottom of the culture pond. In the traditional culture mode, the sand layer needs to be completely discharged to ensure that all residual feed and feces are discharged out of the system. After each sand discharge, new sand layer needs to be added. In the long run, not only the culture cost and labor intensity are increased, but also mechanical damage to the cultured prawns and stress reaction are caused. Therefore, how to improve the filter system of the prawn culture system and improve the bottom water quality has become a technical and equipment problem that needs to be solved in the prawn culture process. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide a Japanese prawn recirculating aquaculture system to solve the technical problems of complex operation, serious energy consumption and serious environmental pollution in the prior art prawn culture.

[0006] To achieve the above-mentioned objectives, the technical scheme adopted by the present application is as follows:

[0007] The present application provides a Japanese prawn recirculating aquaculture system, comprising a prawn culture pond and an external water treatment device, wherein the external water treatment device is connected with the culture pond through a circulating pump, a water inlet pipe and a water outlet pipe to form a recirculating water system; the external water treatment device comprises a drum microfilter, a three-stage biological filter, a protein separator and a pipeline ultraviolet sterilizer connected in sequence, the drum microfilter is used for removing large-diameter organic suspended particles in the water for culture, the three-stage biological filter is used for removing ammonia nitrogen in the water for culture and intercepting fine suspended particles, the protein separator is used for air floatation separation of fine particles and bacteria, and the pipeline ultraviolet sterilizer kills harmful bacteria and pathogens in the water through ultraviolet rays.

[0008] The prawn culture pond comprises a pond body, a flow guide support, a prawn tray, a water inlet pipe, a nano aeration pipe and a sewage discharge mechanism, wherein the bottom of the pond body is provided with a water outlet, the flow guide support is located at the bottom of the pond body, the prawn tray is placed on the flow guide support, the water inlet pipe and the nano aeration pipe are arranged in the prawn tray, the water inlet pipe is used for providing water source for the prawn tray, and the nano aeration pipe is used for aeration.

[0009] The pond body is circular or circular-rectangular in shape and is surrounded by a pond bottom and a pond wall, and the pond bottom has a slope facilitating the concentration of sewage at the water outlet in the center of the bottom.

[0010] The flow guide support is a multi-layer discontinuous annular structure and plays a role in guiding water and sewage and supporting the prawn tray.

[0011] The flow guide support is made of cement and the pond body in an integral structure.

[0012] The prawn tray comprises a plurality of fan-shaped tray bodies uniformly distributed in the circumferential direction, and each fan-shaped tray body comprises a tray wall, a screen gauze and a cement screen plate, wherein the cement screen plate is arranged at the bottom of the tray wall, the screen gauze is covered on the cement screen plate, and the screen gauze is paved with bottom sand for prawns to inhabit.

[0013] The water inlet pipe comprises double-layer annular pipes arranged in the upper and lower layers, the lower-layer annular pipe is buried in the bottom sand, and a large number of water outlet holes are arranged on the pipe wall, and the upper-layer annular pipe is located above the bottom sand, and a small number of water outlet holes are arranged on the pipe wall.

[0014] The upper-layer annular pipe is located at one-third height from the water surface.

[0015] The nano aeration pipe comprises double-layer aeration pipes arranged in the upper and lower layers, the lower-layer aeration pipe is buried in the bottom sand, and the upper-layer aeration pipe is located above the bottom sand.

[0016] The sewage mechanism comprises a cutting sewage pump, a limiting sewage collecting pipe, a water outlet pipe and a sewage pipe, wherein the limiting sewage collecting pipe is arranged at the water outlet and has a height lower than that of the pool body; the cutting sewage pump is accommodated in the limiting sewage collecting pipe, the bottom sidewall of the limiting sewage collecting pipe is provided with a sewage collecting opening, the sewage collecting opening facilitates the concentrated sewage at the bottom of the pool to enter the cutting sewage pump, the water outlet pipe and the sewage pipe are respectively connected with the bottom and the side of the cutting sewage pump, the water outlet pipe passes through the water outlet, and the sewage pipe leads the sewage in the pool to the sewage collecting tank after being led out of the breeding pool.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The breeding pool of the present application has an inclined bottom, central water drainage and tangential water inlet, and a unique cement flow guide support structure, so that vortex is formed in the pool, and the shrimp shells, leftover feed and feces are quickly gathered to the cutting sewage pump at the center of the bottom under the action of the tangential force of the water flow.

[0019] 2. The use of the cutting sewage pump of the present application realizes the simultaneous discharge of most of the water body, leftover feed and feces, and shrimp shells through separate pipes.

[0020] 3. The present application can timely and effectively separate and collect the leftover feed, feces and shrimp shells and other solid residue particles in the breeding pool, reduce the degradation opportunity of the solid particles in the pipeline between the breeding pool and the filter, and reduce the operation load of the rotating drum type microfilter, protein separator and biological filter tank in the subsequent recirculating aquaculture system.

[0021] 4. The breeding system of the present application comprises solid particle removal, biological purification, protein separation, oxygenation, disinfection and sterilization and other water treatment elements, and the water recycling rate is more than 90%, which provides good water quality for the growth and development of Japanese prawns. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a layout block diagram of the Japanese prawn recirculating aquaculture system of the present application;

[0023] Figure 2 It is a schematic diagram of the overall structure of the breeding pool in the present application;

[0024] Figure 3 It is a top view of the breeding pool in the present application;

[0025] Figure 4 It is a cement flow guide support structure diagram of the breeding pool in the present application;

[0026] Figure 5 It is a structure schematic diagram of the shrimp tray in the breeding pool of the present application.

[0027] In the figure: 1-pool body; 2-flow guide support; 3-shrimp tray; 31-tray wall; 32-bottom sand; 33-sieve silk net; 34-cement sieve plate; 4-outlet; 5-cutting sewage pump; 6-limiting sewage collecting pipe; 61-sewage collecting port; 7-outlet pipe; 8-drain pipe; 9-inlet pipe; 10-nano aeration pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is described in detail below with reference to the drawings and specific embodiments.

[0029] As Figure 1 shown, the present application provides a Japanese prawn recirculating aquaculture system, which comprises a prawn culture pond and an external water treatment device, wherein the external water treatment device is connected with the culture pond through a circulating pump, an inlet pipe and an outlet pipe to form a recirculating water system, and the culture water is repeatedly used after being treated by the external water treatment device; the external water treatment device comprises a drum-type microfilter, a three-stage biological filter, a protein separator and a pipeline type ultraviolet disinfection device connected in sequence, the drum-type microfilter is used for removing large-diameter organic suspended particles in the culture water, the diameter of the large-diameter organic suspended particles is greater than 40 μm; the three-stage biological filter is used for removing ammonia nitrogen in the culture water and intercepting fine suspended particles; the protein separator is used for air floatation separation of fine particles and bacteria; and the pipeline type ultraviolet disinfection device kills harmful bacteria and pathogens in the water body through ultraviolet rays.

[0030] As Figures 2-3 shown in the embodiment of the present application, the prawn culture pond comprises a pool body 1, a flow guide support 2, a shrimp tray 3, an inlet pipe 9, a nano aeration pipe 10 and a sewage discharge mechanism, wherein the bottom of the pool body 1 is provided with an outlet 4, the flow guide support 2 is located at the bottom of the pool body 1, the shrimp tray 3 is placed on the flow guide support 2, the inlet pipe 9 and the nano aeration pipe 10 are distributed in the shrimp tray 3, the inlet pipe 9 is used for providing water source for the shrimp tray 3, and the nano aeration pipe 10 is used for aeration.

[0031] In the embodiment, the pool body 1 is circular or circular-rectangular, which is surrounded by a pool bottom and a pool wall, the pool bottom has a slope facilitating the concentration of pollutants at the outlet 4 in the center of the bottom, and the pool bottom adopts a “pot bottom type” with a deep middle and shallow periphery, facilitating the concentration of pollutants in the center of the bottom.

[0032] As Figure 2As shown in the drawings, in the embodiment of the present application, the sewage discharge mechanism comprises a cutting sewage pump 5, a limiting sewage collecting pipe 6, a water outlet pipe 7 and a sewage discharge pipe 8. The limiting sewage collecting pipe 6 is arranged at the water outlet 4 and has a height lower than that of the pool body 1, thereby limiting the water level in the pool. The cutting sewage pump 5 is accommodated in the limiting sewage collecting pipe 6. The bottom side wall of the limiting sewage collecting pipe 6 is provided with a sewage collecting opening 61, which facilitates the concentrated sewage at the bottom of the pool to enter the cutting sewage pump 5. The water outlet pipe 7 is connected to the bottom of the cutting sewage pump 5 and penetrates the water outlet 4, thereby discharging the treated sewage. The sewage discharge pipe 8 is connected to the side of the cutting sewage pump 5 and is used to discharge the treated solid sewage, which will enter the sewage collecting tank through the sewage discharge pipe 8.

[0033] Specifically, the cutting sewage pump 5 has a structure with tearing, which can tear and cut the solid sewage such as residual food, feces and shrimp shells in the sewage, and then discharge the sewage. The cutting sewage pump 5 has strong sewage discharge capacity and can effectively pass the solid particles with a diameter of 30-80 mm without blockage.

[0034] As shown in the drawings, Figure 4 In the embodiment of the present application, the flow guide support 2 has a multi-layer discontinuous annular structure, which guides the water and sewage and supports the shrimp tray 3. Generally, the flow guide support 2 has 3-4 layers, and the height of the support decreases from inside to outside, but the upper surfaces of the supports are in a plane to support the shrimp tray 3.

[0035] Specifically, the flow guide support 2 is made of cement and the pool body 1 in an integrated structure, which improves the stability of the overall structure and reduces the cost.

[0036] As shown in the drawings, Figures 2-3 In the embodiment of the present application, the shrimp tray 3 comprises a plurality of fan-shaped tray bodies uniformly distributed in the circumferential direction. As shown in the drawings, Figure 5 The fan-shaped tray body comprises a tray wall 31, a silk screen mesh 33 and a cement screen plate 34. The cement screen plate 34 is arranged at the bottom of the tray wall 31 and placed on the cement flow guide support 2. The silk screen mesh 33 completely covers the cement screen plate 34. The bottom sand 32 is laid on the silk screen mesh 33, which provides a habitat for Japanese prawns and also absorbs the residual food and feces of the prawns.

[0037] In the embodiment of the present application, the water inlet pipe 9 comprises double-layer annular pipes arranged in an upper and lower manner. The lower annular pipe is buried in the bottom sand 32 and is provided with dense water outlet holes on the pipe wall, so as to exchange the water in the bottom sand 32 and flush the residual food and feces in the bottom sand 32 out of the shrimp tray 3. The upper annular pipe is located above the bottom sand 32 and is provided with sparse water outlet holes on the pipe wall. Preferably, the upper annular pipe is located at one third of the water surface below. Further, the water outlet holes of the water inlet pipe 9 are tangential to the water outlet, and the tangential water flow can form a vortex at the upper layer of the pool body 1, thereby bringing the shrimp shells into the limiting sewage collecting pipe 6.

[0038] In the embodiment of the present application, the nano-aeration pipe 10 comprises double-layer aeration pipes arranged in upper and lower layers, the lower-layer aeration pipe is buried in the bottom sand 32, and the upper-layer aeration pipe is located above the bottom sand 32, at the lower third of the water surface, to supply oxygen for the Japanese prawns and participate in the water exchange in the pond.

[0039] In the embodiment of the present application, the bottom of the breeding pond is inclined, the pond body 1 is arranged to have central drainage and tangential water inlet, and the discontinuous multi-layer annular cement flow guide support 2 structure is additionally provided, so that the water flow in the pond is more likely to form vortex, and the pollutants such as residual feed and feces falling from the shrimp tray 3 are quickly gathered to the center of the pond bottom under the action of the tangential force of the water flow, enter the limiting pollution collection pipe 6 through the pollution collection port 61, and are finally discharged out of the pond after being treated by the cutting type sewage pump 5.

[0040] Specifically, since the specific gravity of the shrimp shell is equivalent to that of water, the shrimp shell is usually floating in the upper middle layer of water, and it is difficult to concentrate the shrimp shell at the center of the pond bottom for treatment. In the breeding pond described in the present application, the tangential water inlet of the water inlet pipe 9 forms vortex in the upper layer of the pond body 1, which drives the shrimp shell floating in the upper middle layer to flow into the cutting type sewage pump 5 from the upper part of the limiting pollution collection pipe 6 for treatment.

[0041] In the embodiment of the present application, the breeding water discharged from the breeding pond enters the water outlet pipe 7, and the pollutants separated from the breeding pond enter the pollution collection tank and are cleaned regularly. The water in the water outlet pipe 7 is filtered by the rotary drum type microfilter to remove organic matter suspended particles larger than 40 μm, the filtrate is discharged from the system after backwashing, and the filtered water enters the first-stage moving bed biological filter tank, the second-stage and third-stage fixed bed biological filter tank in turn, is aerated and oxygenated by the Roots blower in the moving bed biological filter tank, and is treated by the protein separator and the pipeline type ultraviolet sterilizer after being treated by the three-stage biological filter tank, and then enters the water inlet pipe 9 and finally enters the breeding pond again.

[0042] Embodiment one

[0043] Before carrying out the breeding work, the flow guide support 2 made of cement is arranged at the bottom of the pond body 1, a layer of cement sieve plate 34 with water permeable holes is laid on the flow guide support 2, the sieve gauze 33 is completely covered on the laid cement sieve plate 34, and the bottom sand 32 is laid on the sieve gauze 33 as the exchange layer of the breeding pond, so that the breeding can be carried out after adding water.

[0044] In the process of cultivation, under the action of the nano aeration pipe 10, the bottom water body flows up through the water inlet pipe 9, and the upper water body penetrates into the bottom water body through the bottom sand 32, so that the relative "dead water" in the cultivation pond is changed into "live water" through mutual exchange, the bottom sand 32 is activated, and the residual feed and feces in the bottom sand 32 are accelerated to penetrate through the screen gauze 33 and the cement sieve plate 34. The penetrated residual feed and feces are gathered in the pollution collecting port 61 under the action of the water flow vortex, enter the cutting type sewage pump 5, are treated, and are discharged into the pollution collecting tank through the sewage discharge pipe 8. The sewage separated from the treated sewage is discharged from the pool body 1 through the water outlet pipe 7, enters a subsequent water treatment link, and the cultivation effect is shown in Table 1.

[0045] Table 1 Cultivation effect

[0046]

[0047] The present application can effectively separate, collect and remove the residual feed, feces, shrimp shells and other solid residue particles in the cultivation pond in time, reduce the degradation opportunity of the solid particles in the pipeline between the cultivation pond and the filter, and reduce the operation load of the rotary drum type microfilter, the protein separator and the biological filter tank in the subsequent circulating water aquaculture system.

[0048] The cultivation system of the present application comprises solid particle removal, biological purification, protein separation, oxygenation, disinfection and sterilization and other water treatment elements, the water recycling rate is more than 90%, and the growth and development of Japanese prawns are provided with good water quality, the effective flow guide of shrimp shells, residual feed and feces is realized, most of the water body and sewage are discharged through separate pipelines, and a series of subsequent water treatment equipment provides good water quality guarantee for the growth and development of Japanese prawns.

[0049] The above description is only an embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, expansion and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A circulating water culture system for Japanese prawn, characterized by, The shrimp culture pond and external water treatment equipment are connected by a circulating pump, a water inlet pipe and a water outlet pipe to form a circulating water system; the external water treatment equipment comprises a drum type micro filter, a three-stage biological filter, a protein separator and a pipeline type ultraviolet disinfection device connected in sequence, the drum type micro filter is used for removing large-diameter organic suspended particles in the water for culture, the three-stage biological filter is used for removing ammonia nitrogen and intercepting fine suspended particles in the water for culture, the protein separator is used for air floatation separation of fine particles and bacteria, and the pipeline type ultraviolet disinfection device kills harmful bacteria and pathogens in the water by ultraviolet rays; The shrimp culture pond comprises a pond body (1), a flow guide support (2), a shrimp tray (3), a water inlet pipe (9), a nano aeration pipe (10) and a sewage discharge mechanism, wherein the bottom of the pond body (1) is provided with a water outlet (4), the flow guide support (2) is located at the bottom of the pond body (1), the shrimp tray (3) is placed on the flow guide support (2), the water inlet pipe (9) and the nano aeration pipe (10) are arranged in the shrimp tray (3), the water inlet pipe (9) is used for providing water source for the shrimp tray (3), and the nano aeration pipe (10) is used for aeration. The flow guide support (2) is a multi-layer discontinuous ring structure, which plays a role in guiding water and sewage and supporting the shrimp tray (3). The shrimp tray (3) comprises a plurality of fan-shaped tray bodies which are uniformly distributed in the circumferential direction, and each fan-shaped tray body comprises a tray wall (31), a screen gauze (33) and a cement screen plate (34), wherein the cement screen plate (34) is arranged at the bottom of the tray wall (31), the screen gauze (33) is covered on the cement screen plate (34), and the screen gauze (33) is paved with bottom sand (32) for the shrimp to inhabit. The water inlet pipe (9) comprises double-layer annular pipes arranged in an upper and lower mode, the lower annular pipe is buried in the bottom sand (32), and a plurality of dense water outlet holes are arranged on the pipe wall, and the upper annular pipe is located above the bottom sand (32), and a plurality of sparse water outlet holes are arranged on the pipe wall.

2. The Marsdenia tenacissima plant cell culture of claim 1, wherein the Marsdenia tenacissima plant cell culture is a suspension culture. The nano aeration pipe (10) comprises double-layer aeration pipes arranged in an upper and lower mode, the lower aeration pipe is buried in the bottom sand (32), and the upper aeration pipe is located above the bottom sand (32); the sewage discharge mechanism comprises a cutting type sewage pump (5), a limiting sewage collecting pipe (6), a water outlet pipe (7) and a sewage discharge pipe (8), wherein the limiting sewage collecting pipe (6) is arranged at the water outlet (4) and has a height lower than that of the pond body (1); the cutting type sewage pump (5) is accommodated in the limiting sewage collecting pipe (6), the bottom side wall of the limiting sewage collecting pipe (6) is provided with a sewage collecting opening (61), the sewage collecting opening (61) facilitates the sewage concentrated at the bottom of the pond to enter the cutting type sewage pump (5), the water outlet pipe (7) and the sewage discharge pipe (8) are respectively connected to the bottom and the side of the cutting type sewage pump (5), the water outlet pipe (7) penetrates through the water outlet (4), and the sewage discharge pipe (8) leads the sewage in the pond out of the culture pond and then discharges the sewage into a sewage collecting tank.

3. The Marsdenia tenacissima plant cell culture of claim 1, wherein the Marsdenia tenacissima plant cell culture is a suspension cell culture. The pond body (1) is circular or circular-rectangular and is surrounded by a pond bottom and a pond wall, and the pond bottom has a slope facilitating the sewage to be concentrated at the center of the bottom at the water outlet (4).

4. The Marsdenia tenacissima plant cell culture of claim 1, wherein the Marsdenia tenacissima plant cell culture is a suspension cell culture. The flow guide support (2) is made of cement and the pond body (1) into an integral structure. The upper annular pipe is located at one third height from the water surface.

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