A flexible semi-submersible closed cycle water aquaculture system

Abstract

The application discloses a kind of flexible semi-submersible closed cycle water aquaculture equipment, it is related to aquaculture equipment field, including manual operation platform, waterproof oilcloth, frame and water quality filtration system;The waterproof oilcloth is around frame;The frame and waterproof oilcloth constitute the closed breeding cabin of top opening;The water quality filtration system transports sewage and introduces external water, and processes sewage and external water.The device can realize closed feeding, greatly reduce the risk of external virus and parasitic invasion, can retain original ecological balance and environmental stability, while, the negative influence to external water area is lower, will not cause the eutrophication of surrounding water area, sediment pollution and other hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aquaculture equipment, in particular to a flexible semi-submersible closed recirculating aquaculture equipment. BACKGROUND

[0002] With the increasing demand for fish protein, the demand for offshore aquaculture is increasing, and the current nearshore aquaculture area has gradually tended to be saturated. The super-density cultivation has a great impact on the nearshore water environment. The traditional open net cage cultivation faces the risk of fish and lice infection and environmental pollution. The fish species cultivated in the open net cage are prone to escape, which may threaten the gene pool of wild populations. The traditional net cage open net cage cultivation is essential for the temperature, dissolved oxygen and waste removal requirements of the cultivation process, which are determined by the external water environment, so the site selection requirements are also higher. However, the current land-based recirculating aquaculture equipment needs to occupy valuable land and coastline resources, faces more stringent environmental regulations and higher cost-effectiveness, and these shortcomings are inevitable for traditional cultivation, so a closed recirculating aquaculture equipment is needed to solve these problems. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application provides a flexible semi-submersible closed recirculating aquaculture equipment and a use method. The device can realize closed feeding, greatly reducing the risk of invasive alien species, and can maintain the original ecological balance and environmental stability. At the same time, the negative impact on the external water area is low, and will not cause eutrophication, sediment pollution and other hazards to the surrounding water area.

[0004] The present application achieves the above technical purpose by the following technical means.

[0005] A flexible semi-submersible closed recirculating aquaculture equipment, comprising a waterproof oilcloth, a frame and a water quality filtration system; the waterproof oilcloth is wrapped around the frame; the frame and the waterproof oilcloth form a closed cultivation cabin with an open top; the water quality filtration system transports sewage and introduces external water, and processes the sewage and the external water.

[0006] In the above scheme, a drain port is arranged below the closed cultivation cabin, and a water pump is arranged at the drain port; the water pump is used to suck the sewage in the closed cultivation cabin into the water quality filtration system.

[0007] In the scheme, the water quality filtering system comprises a water inlet pipe, a water outlet pipe, a filter, a nitrogen oxide removal device, a mixing tank and an ultraviolet sterilization machine; the filter, the nitrogen oxide removal device, the mixing tank and the ultraviolet sterilization machine are sequentially communicated through one-way pipes; the water inlet pipe comprises a first water inlet pipe and a second water inlet pipe; the first water inlet pipe introduces sewage in a pool into the filter; the second water inlet pipe introduces external water into the mixing tank; the water outlet pipe comprises a first water outlet pipe and a second water outlet pipe; the first water outlet pipe is communicated with the nitrogen oxide removal device and discharges part of sewage treated by the nitrogen oxide removal device out of the closed breeding cabin; the second water outlet pipe is communicated with the ultraviolet sterilization machine and supplements water filtered and sterilized into the closed breeding cabin; a plurality of water sprayers are arranged on the second water outlet pipe.

[0008] In the scheme, one end of the second water inlet pipe is communicated with external water and the other end is communicated with the mixing tank; a grid is arranged in the second water inlet pipe; the grid is used to filter floating objects.

[0009] In the scheme, the water sprayers have the same water outlet direction and the water flowing out has a certain initial velocity.

[0010] In the scheme, an annular floating box is arranged above the closed breeding cabin, and a human work platform is arranged on the annular floating box; the annular floating box makes the closed breeding cabin float on the water surface.

[0011] In the scheme, a fence is arranged on the inner side of the human work platform, a plurality of longitudinal fixed ropes are arranged on the lower side of the fence, and a plurality of transverse fixed ropes are arranged on the frame; the transverse fixed ropes and the longitudinal fixed ropes are used to reinforce the waterproof oilcloth on the frame.

[0012] In the scheme, the annular floating box is fixed by a rope.

[0013] In the scheme, a plurality of counterweights are arranged below the frame; the water quality filtering system is arranged in two symmetrical groups.

[0014] The use method of the flexible semi-submersible closed circulating water breeding equipment comprises the following steps:

[0015] Step one: first, the breeding equipment is placed in the selected water area, the human work platform floats on the water surface under the action of the annular floating box, after everything is ready, the water pump in the mixing tank starts to operate, the water in the external water area is pumped into the breeding equipment through the second water inlet pipe, and when the water in the breeding equipment is full, the operation is stopped, and the fish to be bred is put into the flexible semi-submersible closed circulating water breeding equipment;

[0016] Step two: when the water quality in the breeding equipment needs to be cleaned, the lower water outlet of the breeding equipment is opened, the water pump operates, the sewage in the breeding equipment is pumped out and input into the water quality filtering system through the first water inlet pipe.

[0017] Step three: the sewage that needs to be cleaned, first through the filter machine carries out the preliminary filtration, carries out solid-liquid separation to the larger particle dirt contained in the water, the water after preliminary filtration is sent to the nitrogen oxide removal device in a one-way pipeline, controls the content of nitrogen oxide in the water, the lower part of the nitrogen oxide removal device is fixed with the first water outlet pipe, for discharging a part of the cleaned water from the breeding equipment, the remaining part of the water flows into the mixing box through the one-way pipeline, at this time the water pump in the mixing box works, through the second water inlet pipe, a part of the water in the external water area is extracted and sent into the mixing box, and the water after mixing is fully mixed with the water after filtering, the mixed water flows into the last module ultraviolet sterilization machine through a one-way pipeline, and the mixed water is disinfected and sterilized to remove harmful pathogenic microorganisms in the water body to fish;

[0018] Step four: the filtered water flows into the second water outlet pipe, and the multiple water sprayers on the inner side of the second water outlet pipe spray the water flow in the clockwise direction, giving the water in the breeding equipment a certain flow direction, fish are used to swimming against the water, and the water has a certain flow rate, which is very helpful to the growth and development of fish, and the movement improves the quality of fish meat.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1. The device structure is simple, and the production is more convenient, since the main material is mostly flexible material, the production cost is lower, and the device is affordable and practical, and can meet the needs of large-scale fish feeding.

[0021] 2. The structure is fixed by the transverse fixing rope, the longitudinal fixing rope and the circular metal ring, so as to reduce the deformation of the whole breeding equipment under the action of waves and sea currents as much as possible, and ensure sufficient breeding space.

[0022] 3. The traditional breeding method generally has larger environmental pollution, and the present application has lower negative influence on the external water area, and will not cause eutrophication, sediment pollution and other hazards in the surrounding water area.

[0023] 4. Since it is closed feeding, the risk of invasion of alien species is greatly reduced, and the original ecological balance and environmental stability can be maintained.

[0024] 5. The water quality in the breeding equipment, such as dissolved oxygen, temperature, particle concentration, etc., is artificially controlled by means of oxygen injection and temperature control, and the water flow can also be controlled according to the habits of fish, thereby reducing the dependence on the external water environment.

[0025] 6. Since the body of the present application is made of flexible material, the culture pond can automatically shrink after the water is drained from the inside during fish collection, greatly improving the convenience of fish collection. Moreover, due to the flexible material, the culture space of the present application can be changed in size according to actual needs, increasing the use scenarios of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a flexible semi-submersible closed circulation aquaculture equipment;

[0027] Figure 2 is a top view schematic diagram of Figure 1

[0028] Figure 3 is a left view or right view schematic diagram of Figure 1

[0029] Reference signs:

[0030] 1 - drain; 2 - water pump; 3 - first water inlet pipe; 4 - manual working platform; 5 - filter; 6 - nitrogen oxide removal device; 7 - mixing tank; 8 - ultraviolet sterilization and disinfection machine; 9 - one-way pipeline; 10 - first water outlet pipe; 11 - second water inlet pipe; 12 - second water outlet pipe; 13 - water sprayer; 14 - counterweight; 15 - longitudinal fixed rope; 16 - transverse fixed rope; 17 - annular float; 18 - fence; 19 - waterproof oilcloth; 20 - frame; 21 - grating. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] ​​In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] A flexible semi-submersible closed circulation water aquaculture equipment, comprising a waterproof tarpaulin 19, a frame 20 and a water quality filtration system; the waterproof tarpaulin 19 is wrapped around the frame 20; the frame 20 and the waterproof tarpaulin 19 form a closed aquaculture cabin with an open top; the water quality filtration system transports sewage and introduces external water, and processes the sewage and the external water.

[0035] In the above scheme, a drain port 1 is arranged below the closed aquaculture cabin, and a water pump 2 is arranged at the drain port 1; the water pump 2 is used to suck the sewage in the closed aquaculture cabin into the water quality filtration system.

[0036] In the above scheme, the water quality filtration system includes an inlet pipe, an outlet pipe, a filter 5, a nitrogen oxide removal device 6, a mixing box 7 and an ultraviolet sterilizer 8; the filter 5, the nitrogen oxide removal device 6, the mixing box 7 and the ultraviolet sterilizer 8 are connected in sequence through a one-way pipe 9; the inlet pipe includes a first inlet pipe 3 and a second inlet pipe 11; the first inlet pipe 3 introduces the sewage in the pool into the filter 5; the second inlet pipe 11 introduces external water into the mixing box 7; the outlet pipe includes a first outlet pipe 10 and a second outlet pipe 12; the first outlet pipe 10 is connected to the nitrogen oxide removal device 6, and discharges part of the sewage treated by the nitrogen oxide removal device 6 out of the closed breeding cabin; the second outlet pipe 12 is connected to the ultraviolet sterilizer 8, and replenishes the filtered and disinfected water into the closed breeding cabin; a number of sprinklers 13 are provided on the second outlet pipe 12.

[0037] In the above solution, one end of the second water inlet pipe 11 is connected to the external water, and the other end is connected to the mixing box 7; a grid 21 is provided in the second water inlet pipe 11; the grid 21 is used to filter floating objects.

[0038] In the above solution, the water outlets of the sprinkler 13 are in the same direction, and the water flowing out has a certain initial velocity.

[0039] In the above solution, an annular buoyancy box 17 is provided above the closed breeding cabin, and a manned operation platform 4 is provided on the annular buoyancy box 17; wherein, the annular buoyancy box 17 enables the closed breeding cabin to float on the water surface.

[0040] In the above scheme, a fence 18 is provided on the inner side of the manual work platform 4, a plurality of longitudinal fixing ropes 15 are provided on the lower side of the fence, and a plurality of transverse fixing ropes 16 are provided on the frame 20; the transverse fixing ropes 16 and the longitudinal fixing ropes 15 are used to reinforce the waterproof tarpaulin 19 on the frame 20.

[0041] In the above solution, the annular buoyancy box 17 is fixed by ropes.

[0042] In the above solution, a plurality of counterweights 14 are provided below the frame 20; the water filtration system is symmetrically provided in two groups.

[0043] Combined with attachment Figure 1 As shown, the directions of the present invention are as follows: the position of the drain outlet 1 is at the bottom, the position of the manual working platform 4 is at the top, the direction close to the drain outlet 1 is at the inside, and the direction away from the center of the drain outlet 1 is at the outside.

[0044] The application discloses a flexible semi-submersible closed circulation water aquaculture equipment which can be used for aquaculture in sheltered water areas such as inland rivers, lakes and offshore straits, and is provided with a drainage port 1 at the center lower part of the aquaculture equipment, a water pump 2 arranged in the drainage port 1, and two water quality filtering systems connected with the drainage port 1 through two water inlet pipes, wherein the water inlet pipe is a first water inlet pipe 3, the water quality filtering system comprises four modules which are sequentially a filter 5, a nitrogen oxide removal device 6, a mixing box 7 and an ultraviolet sterilization and disinfection machine 8, and the four modules are connected through one-way pipes 9.

[0045] The components of the two symmetrical water quality filtering systems are completely same, wherein the filter 5 is connected with the first water inlet pipe 3, the filter 5 and the nitrogen oxide removal device 6 are connected through the one-way pipe 9, the nitrogen oxide removal device 6 is connected with a first water outlet pipe 10, the nitrogen oxide removal device 6 and the mixing box 7 are connected through the one-way pipe 9, the mixing box 7 is connected with a second water inlet pipe 11, the mixing box 7 and the ultraviolet sterilization and disinfection machine 8 are connected through the one-way pipe 9, the ultraviolet sterilization and disinfection machine 8 is connected with a second water outlet pipe 12, and a plurality of water sprayers 13 are arranged on the inner side of the second water outlet pipe.

[0046] A man-operated platform 4 is arranged above the water quality filtering system, a fence 18 is arranged on the man-operated platform, and a ring-shaped floating box 17 is arranged in the space below the water quality filtering system on the man-operated platform, and the ring-shaped floating box 17 can be replaced by other required equipment such as a feed bin, a plurality of longitudinal fixed ropes 15 are arranged below the fence 18 on the inner side of the man-operated platform, a circular metal frame 20 is fixed to the longitudinal fixed ropes 15 at the bending position of the first water inlet pipe 3 and the closed end of the second water outlet pipe 12, the size of the circular metal frame 20 is same as the size of the inner diameter of the man-operated platform 4, the longitudinal fixed ropes 15 are finally gathered at the drainage port 1 and the drainage port 1 is fixed to the center lower part of the aquaculture equipment, the longitudinal fixed ropes 15 are connected and reinforced by a plurality of transverse fixed ropes 16, and a plurality of counterweights 14 are further fixed to the longitudinal fixed ropes 15 below the circular metal frame 20.

[0047] A waterproof oilcloth 19 is arranged outside the entire closed aquaculture equipment frame, the waterproof oilcloth 19 is arranged outside the longitudinal fixed ropes 15, the transverse fixed ropes 16 and the circular metal frame 20, and the inner surfaces of all the water outlet pipes and water inlet pipes are waterproof, the upper part of the entire aquaculture equipment is in a cylindrical shape, and the lower part is in an inverted conical shape.

[0048] Combined with the accompanying drawings Figures 1-3 The specific working process of the closed aquaculture equipment is as follows:

[0049] Step one: first put the invention into the selected water area, the artificial operation platform is floating on the water surface under the action of the annular buoy 17, after everything is ready, the water pump in the mixing box 7 starts to work, the water in the external water area is pumped into the breeding equipment through the second water outlet pipe 12, when the water in the breeding equipment is full, stop working, put the fish that needs to be bred into the breeding equipment.

[0050] Step two: when the water quality in the breeding equipment needs to be cleaned, the lower end of the breeding equipment is opened, the water pump 2 is operated, the sewage in the breeding equipment is pumped out and transported into the water quality filtration system through the first water inlet pipe 3.

[0051] Step three: the sewage that needs to be cleaned is first filtered by the filter 5 to separate the solid and liquid, such as fish bait residue and excrement, the water after preliminary filtration is sent to the nitrogen oxide removal device 6 through a one-way pipe 9 to control the content of nitrogen oxide in the water, the lower part of the nitrogen oxide removal device 6 is fixed with the first water outlet pipe 10, which is used to discharge a part of the cleaned water from the breeding equipment, the remaining part of the water flows into the mixing box 7 through the one-way pipe 9, at this time the water pump in the mixing box 7 works, through the second water inlet pipe 11, a part of the water in the external water area is pumped into the mixing box 7 to mix with the water after filtration, the mixed water flows into the last module ultraviolet sterilization machine 8 through a one-way pipe, the mixed water is disinfected and sterilized to remove harmful pathogenic microorganisms in the water.

[0052] Step four: the completely symmetrical water quality filtration system finally flows the filtered water into the second water outlet pipe 12, the multiple water sprayers 13 on the inner side of the two second water outlet pipes 12 spray water in the clockwise direction, giving the water in the breeding equipment a certain flow direction, fish are used to swimming against the water, the water has a certain flow rate, fish swimming against the water is very helpful to the growth and development of fish, and the movement improves the quality of fish meat. This cycle forms the semi-submersible closed breeding equipment of the invention.

[0053] A circular drain is arranged at the center of the bottom of the breeding equipment, a water pump is arranged in the drain for pumping the sewage in the pool into two symmetrical water quality filtration systems, and the drain is connected with the two water quality filtration systems through two first water inlet pipes respectively.

[0054] The water quality filtering system in the application comprises four modules, namely a filtering machine 5, a nitrogen oxide removal device 6, a mixing tank 7 and an ultraviolet sterilization machine 8, and the four modules are connected through one-way pipelines 9. The filtering machine 5 is used for preliminarily cleaning the sewage drawn from the aquaculture equipment, and solid-liquid separation is performed on the relatively large particles of dirt contained in the sewage, such as fish feed residues and excrement, and then the preliminarily treated water is sent into the nitrogen oxide removal device 6 through the one-way pipelines 9. The solid waste filtered out of the filtering machine 5 can be taken out of the filtering machine to the land for aseptic treatment. The nitrogen oxide removal device 6 has two effects. One is to remove the residual nutrients in the water to avoid the pollution of the surrounding water caused by the discharge of these substances into the surrounding water. The other is to adjust the PH value of the water to the best survival environment of the fish, which meets the discharge requirements of the water and the survival requirements of the fish in the aquaculture equipment. The nitrogen oxide removal device 6 has two water outlets. One is a one-way pipeline for sending part of the water treated by the nitrogen oxide removal device to the next module. The other is connected with the first water outlet pipeline for discharging part of the treated water from the aquaculture equipment to prevent the continuous accumulation of harmful substances such as toxins in the water, which is harmful to the fish in the aquaculture equipment. A grid is installed at the lower part of the first water outlet pipeline to prevent fish in the external water area from swimming into the nitrogen oxide removal device. Moreover, the water discharged into the external water area after being treated by the large particle separation and nitrogen oxide removal will not cause harm to the water quality of the external water area, such as eutrophication, and the ecological environment of the surrounding water area is controlled as much as possible.

[0055] The water treated twice is sent to the third module mixing tank, which is provided with a water pump. The third module has two water inlets and one water outlet. The first water inlet is a one-way pipeline for sending water from the nitrogen oxide removal device into the mixing tank. The second water inlet is connected with the second water inlet pipeline, which is also provided with a grid at the lower part to prevent fish and shrimp in the external water area from being sucked into the mixing tank. At this time, the water pump arranged in the mixing tank operates to draw water from the external water area into the mixing tank to supplement the water discharged through the first water outlet pipeline, and the water from the external water area and the treated water are fully mixed in the mixing tank. The complete closed internal circulation will cause the continuous accumulation of harmful substances in the water body, so part of the water needs to be discharged and part of the water needs to be supplemented to maintain the balance of the water body in the entire aquaculture equipment.

[0056] The mixed water is sent to the fourth module ultraviolet sterilization machine through the one-way pipeline. The ultraviolet sterilization machine sterilizes and disinfects the mixed water to remove pathogenic bacteria and microorganisms harmful to fish in the water.

[0057] The water treated by the water quality filtering system is finally discharged into the aquaculture equipment through the second water outlet pipe, wherein the lower end of the second water outlet pipe is completely closed, and the other end is connected to the hollow pipe below the ultraviolet sterilization machine, and a plurality of water sprayers are arranged on the side of the second water outlet pipe facing the center of the aquaculture equipment. The water sprayers are symmetrically arranged and have the same water spraying direction. When the water sprayers discharge water, the water in the aquaculture equipment flows in a rotating manner. Fish are used to swimming against the water, and the water has a certain flow rate. The constant movement of fish swimming against the water improves the quality of fish meat and is very helpful to the growth and development of fish. The rotating water flow can make the particles in the pool settle down, which is more conducive to the discharge of solid particles.

[0058] Two symmetrical water quality filtering systems are installed below the manual operation platform. The remaining space is provided with a ring-shaped floating box, and some other required devices, such as a feed bin, can also be installed. The entire manual operation platform is floated on the water surface. The fence is installed on the inside and outside of the manual operation platform, which plays a role in protecting the safety of the operating personnel.

[0059] A plurality of fixed ropes are arranged below the fence inside the manual operation platform. The fixed ropes are fixed with a circular metal frame at the bending part of the first water inlet pipe and the closed end of the second water outlet pipe. The metal frame is not limited to metal frame, and other rust-proof or corrosion-resistant materials can be used instead. The size of the frame is the same as the inner diameter of the manual operation platform. The fixed ropes finally converge at the drain outlet and fix the drain outlet at the center bottom of the aquaculture equipment. A plurality of horizontal fixed ropes are connected between the vertical fixed ropes to improve the strength of the overall structure.

[0060] A plurality of counterweights are further fixed to the fixed ropes below the circular metal frame. The counterweights provide downward tension to reduce the deformation of the entire aquaculture equipment under the action of waves and currents as much as possible to ensure the stability of the living environment of fish inside the aquaculture equipment.

[0061] A layer of waterproof oilcloth is sleeved outside the entire closed aquaculture equipment frame. The waterproof oilcloth is not limited to waterproof oilcloth, and other waterproof flexible materials can be used instead. The waterproof oilcloth is sleeved outside the fixed ropes and the circular metal frame, and inside the water outlet pipe and the water inlet pipe. The upper part of the entire aquaculture equipment is in a cylindrical shape, and the lower part is in an inverted conical shape, which is more conducive to the gathering of fish bait residues and excrement at the drain outlet, so as to discharge the aquaculture equipment. The waterproof oilcloth isolates the entire aquaculture equipment from the external water area. The waterproof oilcloth needs to be treated to prevent water from entering the aquaculture equipment.

[0062] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application without departing from the principles and spirit of the present application.

Claims

1. A flexible semi-submersible closed cycle water farming installation, characterized in that, The utility model relates to a closed aquaculture cabin, which comprises a waterproof tarpaulin (19), a frame (20) and a water quality filtering system, wherein the waterproof tarpaulin (19) is wrapped around the frame (20), the frame (20) and the waterproof tarpaulin (19) form a closed aquaculture cabin with an open top, the water quality filtering system transports sewage and introduces external water, and processes the sewage and the external water, a drain outlet (1) is arranged below the closed aquaculture cabin, a water pump (2) is arranged at the drain outlet (1), the water pump (2) is used to suck the sewage in the closed aquaculture cabin into the water quality filtering system, the water quality filtering system comprises a water inlet pipe, a water outlet pipe, a filter (5), a nitrogen oxide removal device (6), a mixing tank (7) and an ultraviolet sterilization and disinfection machine (8), the filter (5), the nitrogen oxide removal device (6), the mixing tank (7) and the ultraviolet sterilization and disinfection machine (8) are sequentially connected through one-way pipes (9), the water inlet pipe comprises a first water inlet pipe (3) and a second water inlet pipe (11), the first water inlet pipe (3) introduces the sewage in the pool into the filter (5), the second water inlet pipe (11) introduces the external water into the mixing tank (7), the water outlet pipe comprises a first water outlet pipe (10) and a second water outlet pipe (12), the first water outlet pipe (10) is connected with the nitrogen oxide removal device (6) and discharges part of the sewage treated by the nitrogen oxide removal device (6) from the closed aquaculture cabin, the second water outlet pipe (12) is connected with the ultraviolet sterilization and disinfection machine (8) and supplements the water filtered and disinfected into the closed aquaculture cabin, a plurality of water sprayers (13) are arranged on the second water outlet pipe (12), one end of the second water inlet pipe (11) is communicated with the external water, and the other end is communicated with the mixing tank (7), a grating (21) is arranged in the second water inlet pipe (11), the grating (21) is used to filter floating objects, the water sprayers (13) have the same water outlet direction, and the water flowing out has a certain initial velocity, the sewage to be cleaned is preliminarily filtered through the filter (5), the relatively large particles of dirt contained in the water are subjected to solid-liquid separation, the water after preliminary filtration is sent to the nitrogen oxide removal device (6) through a one-way pipe (9), the content of nitrogen oxides in the water is controlled, a first water outlet pipe (10) is fixed to the lower part of the nitrogen oxide removal device (6) and is used to discharge part of the cleaned water from the aquaculture equipment, the remaining part of the water flows into the mixing tank (7) through a one-way pipe (9), at this time, the water pump in the mixing tank (7) works, a part of the water in the external water area is extracted through the second water inlet pipe (11) and is sent into the mixing tank (7), is mixed with the water after filtration, and the mixed water is disinfected and sterilized in the ultraviolet sterilization and disinfection machine (8) through a one-way pipe (9), so that the pathogenic microorganisms harmful to fish in the water body are removed.

2. The flexible semi-submersible closed cycle mariculture apparatus according to claim 1, characterized in that, An annular floating box (17) is arranged above the closed aquaculture cabin, a working platform (4) is arranged on the annular floating box (17), and the annular floating box (17) makes the closed aquaculture cabin float on the water surface.

3. The flexible semi-submersible closed cycle mariculture rig according to claim 2, characterized in that, The human work platform (4) is internally provided with a fence (18), the lower side of the fence is provided with a plurality of longitudinal fixing ropes (15), the frame (20) is provided with a plurality of transverse fixing ropes (16); the transverse fixing ropes (16) and the longitudinal fixing ropes (15) are used to reinforce the waterproof oilcloth (19) on the frame (20).

4. The flexible semi-submersible closed cycle mariculture apparatus according to claim 2, characterized in that, The annular buoyancy tank (17) is fixed by a rope.

5. The flexible semi-submersible closed cycle mariculture apparatus according to claim 1, characterized in that, A plurality of counterweights (14) are arranged below the frame (20); the water quality filtering system is symmetrically arranged in two groups.

6. A method of using a flexible semi-submersible closed cycle mariculture apparatus according to any one of claims 2 to 4, characterized in that, The method comprises the following steps: Step one: first, put the breeding equipment into the selected water area, the human work platform (4) is floated on the water surface under the action of the annular buoyancy tank (17), after everything is ready, the water pump in the mixing tank (7) starts to work, and the water in the external water area is pumped into the breeding equipment through the second water inlet pipe (11), when the water in the breeding equipment is full, the water pump stops working, and the fish to be bred is put into the flexible semi-submersible closed circulation water breeding equipment; Step two: when the water quality in the breeding equipment needs to be cleaned, the lower end water outlet (1) of the breeding equipment is opened, the water pump (2) works, and the sewage in the breeding equipment is pumped out and input into the water quality filtering system through the first water inlet pipe (3); Step three: the sewage to be cleaned is first subjected to preliminary filtration by the filter (5), the larger particles of dirt contained in the water are subjected to solid-liquid separation, the water after preliminary filtration is sent to the nitrogen oxide removal device (6) through a one-way pipe (9), the content of nitrogen oxides in the water is controlled, the lower part of the nitrogen oxide removal device (6) is fixedly provided with the first water outlet pipe (10) for discharging part of the cleaned water from the breeding equipment, part of the water is flowed into the mixing tank (7) through the one-way pipe (9), at this time, the water pump in the mixing tank (7) works, and part of the water in the external water area is pumped into the mixing tank (7) through the second water inlet pipe (11) to be fully mixed with the water after filtration, the mixed water is flowed into the last module ultraviolet sterilization and disinfection machine (8) through a one-way pipe (9), the mixed water is disinfected and sterilized, and the pathogenic microorganisms harmful to fish in the water body are removed; Step four: the filtered water is flowed into the second water outlet pipe (12), the plurality of water sprayers (13) on the inner side of the second water outlet pipe (12) spray the water flow in the clockwise direction, and a certain flow direction is given to the water in the breeding equipment, the fish habitually swim against the water, the water has a certain flow rate, and the fish swimming against the water is very helpful for the growth and development of the fish, and the quality of the fish meat is improved after movement.

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