CN212184748U

CN212184748U - Fish and vegetable symbiotic system

Info

Publication number: CN212184748U
Application number: CN202020531835.0U
Authority: CN
Inventors: 陈知雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-12-22
Anticipated expiration: 2030-04-13

Abstract

The utility model provides a fish and vegetable symbiotic system relates to and plants and breed technical field, has solved the breed inefficiency that exists among the prior art and the serious technical problem of soil solidification. The device is including the breed groove that communicates in proper order, fermentation filter equipment and nitrify and plant the groove, breeds the groove and includes the cell body and set up at the outside bearing structure of cell body, nitrifies and plants the groove one end of keeping away from fermentation filter equipment and through first pipeline and breed groove intercommunication, nitrifies and plants the groove by supreme storehouse, baffle and the planting medium of nitrifying that sets gradually down, nitrifies the inside filler of storehouse and nitrifies filtering material. The utility model is used for breed and planting the trade, will breed the groove through filtration system and combine together with the life waters organic of planting the inslot animal and plant, thereby the effect through the plant comes the indirect breed density that improves the breed groove of quality of water purification, and the cell body makes the breed of fish and shrimp not rely on the cement pond with bearing structure's design to reduce the cost and avoid the soil solidification.

Description

Fish and vegetable symbiotic system

Technical Field

The utility model belongs to the technical field of planting and breed technique and specifically relates to a fish and vegetable intergrowth system is related to.

Background

The traditional aquaculture water quality treatment is a very critical and delicate problem, the conventional production mode is mainly a large amount of water change at present, the biggest problems of extensive culture are water pollution, soil pollution and sea area pollution, and meanwhile, the culture mode is laggard and the culture density is very limited, so that high-yield and high-efficiency culture in small water bodies cannot be realized.

Therefore, the fish-vegetable symbiotic system can be produced at the same time, ammonia nitrogen, nitrite and nitrate in the water body are treated by utilizing filtration and nitration reaction, the current fish-vegetable symbiotic forms are various, most of the fish-vegetable symbiotic forms mainly adopt vegetable production, the cultured species mainly comprise edible fish or ornamental fish, and the culture density is not very high due to the imperfect filtration system, so that the requirement of mass culture cannot be met;

the cost of the fish-vegetable symbiotic system is also an important factor for measuring feasibility, and the traditional high-density cultivation or fish-vegetable symbiosis is based on the fact that a cement pond must be constructed for water prevention, the construction cost is high, the difficulty is high, and the soil must be hardened. At present, due to the limitation of land protection policies, a lot of lands can not be solidified and are strictly approved, and the protection of cultivated land also becomes the problem to be solved by the design of the fish-vegetable symbiotic system at present; the conventional canvas fishpond is also applied to aquaculture, but only the canvas fishpond is used as a culture carrier, and a large amount of water needs to be changed.

Therefore, a new fish-vegetable symbiotic system needs to be designed to solve the problems of low cultivation efficiency and serious land solidification.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fish and vegetable intergrowth system has solved the low and serious technical problem of soil solidification of breed inefficiency that exists among the prior art. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a fish and vegetable symbiotic system, including breeding groove, fermentation filter equipment and nitrify the planting groove, breed the groove and be in including cell body and setting the outside bearing structure of cell body, breed the groove fermentation filter equipment with nitrify the planting groove and communicate in proper order, nitrify the planting groove and keep away from fermentation filter equipment's one end through first pipeline with breed the groove intercommunication, nitrify the planting groove by supreme storehouse, baffle and the planting medium of nitrifying that sets gradually down, nitrify the inside filler of storehouse and nitrify filtering material.

Preferably, still include one end with breed the groove intercommunication other end with the return water pond of fermentation filter equipment intercommunication, the bottom of breeding the groove is at the bottom of the back taper, the return water pond with the lowest end of breeding the tank bottom passes through the second pipeline intercommunication, the return water pond through first water pump with fermentation filter equipment intercommunication.

Preferably, the second pipeline sets up on being close to the lateral wall of return water bottom of the pool, the second pipeline with the position of breed tank bottom intercommunication sets up screen structure.

Preferably, the nitrifying planting tanks are arranged side by side.

Preferably, set up in the breed groove vertical with the inner tube and the cover that the second pipeline is connected are established the outer tube of inner tube outside, the inner tube highest end flushes with breed groove highest water level, the height of outer tube is higher than the inner tube, the bottom of outer tube sets up the water passing portion of mesh.

Preferably, a plurality of nitrify planting groove of reaching keep away from fermentation filter equipment's one end is passed through communicating pipe intercommunication, and is in one of them nitrify planting groove and keep away from fermentation filter equipment's one end sets up the clean water basin, set up the return water pump on the clean water basin, first pipe connection is in on the return water pump.

Preferably, a plurality of water blocking plates are arranged inside the nitrification bin, water through holes are formed in the water blocking plates, and the water through holes between every two adjacent water blocking plates are arranged in a staggered mode.

Preferably, the return water pond with still set up between the breed groove and filter the device of nitrifying, filter the device of nitrifying through setting up the inside second water pump of return water pond with return water pond intercommunication, filter the delivery port of nitrifying the device with breed the groove intercommunication.

Preferably, the supporting structure is a steel frame structure, and the tank body is a composite PVC film or canvas.

Preferably, the nitrifying filter material is a filter ball filled with natural minerals; the fermentation filter device is a fermentation filter bag.

In the technical scheme provided by the utility model, the culture tank, the fermentation filter device and the nitrification planting tank are sequentially communicated, the planting mode of the filter system and the nitrification planting tank can effectively realize the simultaneous operation of aquaculture and vegetable planting, the water quality is purified under the action of plants, and the culture density of the culture tank can be indirectly improved, so that the culture efficiency is integrally improved; breed the groove including the cell body and set up the bearing structure in the cell body outside, mode through this type of bearing structure and cell body can avoid traditional cement pond to breed the form, thereby it more accords with the national regulation to avoid the soil solidification simultaneously to reduce the cost of breeding the groove, nitrify the one end of planting the groove and keeping away from fermentation filter equipment and pass through first pipeline and breed the groove intercommunication, nitrify the planting groove by supreme storehouse of nitrifying that sets gradually down, baffle and planting medium nitrify the inside filler nitrifying filtering material that fills in storehouse, nitrify storehouse and nitrify filtering material's filler make water purification more thorough, make the inside moisture of breed groove of backward flow more suitable breed, this kind of purification backward flow mode only need regularly to breed inslot moisturizing can, avoid a large amount of heavy and diverse of water culture of trading.

The utility model discloses preferred technical scheme can also produce following technological effect at least: a water return pool is also arranged, and poor water quality which is easy to accumulate, such as fish food residues, fish feces and the like in the culture tank is conveyed to the interior of the fermentation filtering device through the water return pool preferentially, so that the working efficiency is improved;

the bottom of the culture tank is provided with an inverted cone bottom, the water return pool is communicated with the lowest end of the bottom of the culture tank through a second pipeline, and the inverted cone bottom is designed to enable fish feces or fish food residue and the like in the culture tank to be more concentrated to the bottom of the culture and enter the water return pool through the second pipeline;

the water return tank is connected with the fermentation filtering device through a first water pump, fish excrement residues and the like are filtered, and water containing fish excrement and shrimp excrement is conveyed into the fermentation filtering device for fermentation filtering treatment;

the second pipeline is connected to the side wall close to the bottom of the water return tank, a residue storage space is formed below the water inlet of the second pipeline in the water return tank and used for storing residues which cannot be decomposed as a fermentation filtering device, a screen structure is arranged at the position where the second pipeline is communicated with the bottom of the culture tank, and the screen structure can pass through residues such as fish feces and the like to prevent fish and shrimps from entering;

the nitrifying planting tanks can be arranged into a plurality of structures arranged side by side according to different culture densities and sizes, so that the water in the culture tanks can be fully purified;

the inside of the culture tank is provided with a mode between the sleeve and the second pipeline, so that water flows from the bottom of the outer pipe into a water-reversing structure flowing from the top of the inner pipe to the inside of the second pipeline, and water is fully contacted with air to be mixed with oxygen;

a water purifying tank is arranged at one end of the nitrification planting tank, which is far away from the fermentation filtering device, and the tail ends of the nitrification planting tanks are communicated through communicating pipes, so that uniform water return is realized;

a plurality of water blocking plates are arranged in the nitrification bin, water through holes are formed in the water blocking plates, and the water through holes between every two adjacent water blocking plates are arranged in a staggered mode, so that water flow forms S-shaped water flow in the nitrification bin, and water is fully contacted with nitrification filtering materials in the nitrification bin;

can also set up independent filtration and nitrify the device, with the inside water of return water pond directly through the filtration backward flow of this device to breed the inslot, can use simultaneously with the mode of fermentation filter equipment and nitrify planting groove.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of a fish-vegetable symbiotic system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a part of the structure of a culture tank and a return water pond provided by the embodiment of the utility model;

FIG. 3 is a schematic view of a structure of a cultivation tank provided by the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a nitrification planting groove part provided by the embodiment of the invention;

FIG. 5 is a schematic view of the front cross-sectional structure of a nitrification planting tank provided by the embodiment of the present invention;

FIG. 6 is a schematic structural view of a communicating mode of a casing inside a culture tank provided by an embodiment of the present invention;

FIG. 7 is a schematic view of a direct connection structure inside a cultivation tank provided by an embodiment of the present invention;

fig. 8 is a schematic view of the communicating structure of the single outer tube inside the cultivation tank provided by the embodiment of the utility model.

FIG. 1-cultivation tank; 2-a fermentation filtration unit; 3-nitrifying the planting tank; 4-a groove body; 5-a support structure; 6-a first conduit; 7-a nitrification bin; 8-a separator; 9-planting medium; 10-a water return pool; 11-a second conduit; 12-a first water pump; 13-an inner tube; 14-an outer tube; 15-communicating tube; 16-a clean water tank; 17-a water return pump; 18-a water-blocking plate; 19-water through holes; 20-a filtration and nitrification device; 21-screen mesh structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The purpose of this embodiment is to provide a fish-vegetable symbiotic system, solves the cultivation inefficiency and the serious problem of soil solidification among the prior art.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1-8, the embodiment of the utility model provides a fish-vegetable symbiotic system including breeding groove 1, fermentation filter device 2 and nitrify planting groove 3, will breed groove 1 through the pipeline, fermentation filter device 2 and nitrify planting groove 3 and connect gradually, then will nitrify planting groove 3 through first pipeline 6 and connect with breeding groove 1 with the one end that fermentation filter device 2 is kept away from, form a rivers and concentrate organic matter such as fish excrement shrimp excrement and so on and filter and ferment decomposition through breeding groove 1 through fermentation filter device 2, fish excrement shrimp excrement that is handled is nitrogen containing substance under the effect such as physics and microorganism is converted into substances such as ammonia nitrogen and nitrite, again utilize powerful surface adhesion nitrobacteria crowd to convert ammonia nitrogen and nitrite into nitrate through nitrifying planting groove 3 and then absorbed by plants such as vegetables that nitrify planting groove 3 plants, realize water purification, finally, the purified water flows back to the interior of the culture tank 1 to complete the circulation of the water, and the inconvenience of water retention can be realized only by complementing evaporation consumption in the culture tank 1 in the process, so that a large amount of water change during culture is avoided.

As an optional implementation mode of the embodiment of the utility model, the breeding tank 1 does not use the traditional cement pond breeding tank to reduce the cost of the breeding tank 1 through the tank body 4 and the support structure 5 arranged outside the tank body 4, and simultaneously, the problem that the land solidification does not meet the national standard in the traditional cement pond breeding is avoided; the specific supporting structure 5 is a steel frame structure, and the tank body 4 is a composite PVC film or canvas.

In order to better realize the function of the nitrification planting tank 3, the nitrification planting tank 3 can adopt a water culture type or a medium bed type, the medium bed type planting tank is preferred in the application, the specific nitrification planting tank 3 is sequentially provided with a nitrification bin 7, a partition plate 8 and a planting medium 9 from bottom to top, the nitrification bin 7 is filled with a nitrification filtering material, the planting medium 9 is used for planting vegetables and other plants, the surface structure of the nitrification filtering material in the nitrification bin 7 provides space for biofilm formation of nitrifying flora, the nitrification filtering material of the application preferably selects a special filtering ball and places a natural mineral porous material in the special filtering ball, so that high surface area ratio can be realized, the flow of water is not influenced by dissolved oxygen, and natural mineral elements can be released for the water body to maintain the balance of the total alkalinity, the total hardness and various ions of the water body; the filtering ball is made of porous or frame ball filled with natural minerals.

As the optional implementation manner of the embodiment of the utility model, a water return pool 10 can be further arranged for concentrating the fish and shrimp feces, fish food and water with large impurity content in the culture tank 1, one end of the water return pool 10 is communicated with the culture tank 1, the other end is communicated with the fermentation filtering device 2, the water return pool 10 conveys the collected water to the fermentation filtering device 2, the water return pool 10 and the culture tank 1 are connected through a second pipeline 11 to form a communicating device, the bottom of the water return pool 10 is lower than the bottom of the culture tank 1, the problem of inconvenience in large span operation management of the water body pool of the culture tank 1 can be avoided, and the efficiency of collecting the fish and shrimp feces, fish food and impurities can be improved; further the bottom design that will breed groove 1 for more effectual collection fish and shrimp excrement and urine or fish eat etc. impurity is at the bottom of the back taper, the least significant position of the bottom of breeding groove 1 passes through second pipeline 11 and return water pond 10 intercommunication, return water pond 10 is through first water pump 12 and fermentation filter equipment 2 intercommunication, first water pump 12 can be for filtering the water pump, filtering the setting of water pump can avoid absorbing the great impurity in return water pond 10 to fermentation filter equipment 2 in, only will contain fish and shrimp excrement and urine, the water transportation of fish food etc. is to fermentation filter equipment 2 in.

In order to avoid clogging of the second pipeline 11 at the joint of the water return tank 10, the second pipeline 11 is arranged on the side wall close to the bottom of the water return tank 10, a residue storage space is formed below the water inlet of the second pipeline in the water return tank and used for storing residues which cannot be decomposed as a fermentation filtering device, and a screen structure 21 is arranged at the position where the second pipeline 11 is communicated with the bottom of the culture tank 1, as shown in the attached drawing 7, the screen structure 21 can prevent fish and shrimp from entering through residues such as excrement of fish and shrimp.

The setting up of return water pond 10 can avoid breeding 1 span large water pump in groove and place the work of not clearing up well at the intermediate position and maintaining and managing, whether the setting of return water pond 10 does not all influence the system, the preferred scheme of this application is for setting up return water pond 10, return water pond 10 can more effectual collection fish and shrimp excrement and urine, the higher water of residue content such as fish food, can also set up vertical pipeline for this reason in 1 inside of breeding the groove, as shown in the attached drawing 8, this pipeline and the second pipeline 11 intercommunication of breeding 1 bottom in groove, and set up screen structure 11 in this circumference that is close to breeding 1 bottom in groove of pipeline, the while can be close to the circumference of surface of water department and set up screen structure 21 on pipeline upper portion for the impurity thing of collecting 1 surface of water position in groove, thereby can collect the impurity of breeding 1 bottom and surface of water department simultaneously.

As an alternative embodiment of the present invention, the inner pipe can be designed into a sleeve type as shown in FIG. 6, wherein a vertical inner pipe 13 connected to the second pipe 11 is disposed in the cultivation tank 1, an outer pipe 14 is sleeved outside the inner pipe 13, the highest end of the inner pipe 13 is flush with the highest water level of the cultivation tank 1, the height of the outer pipe 14 is higher than that of the inner pipe 13, the bottom of the outer pipe 14 is provided with a water passing part of mesh, which can be a screen, such a structure is arranged that the water of the outer pipe 14 forms a communicating vessel with the position of the interlayer between the outer pipe 14 and the inner pipe 13, when the water level of the outer water rises, the water outside the outer pipe 14 will enter the interlayer between the outer pipe 14 and the inner pipe 13, and the impurities such as fish and shrimp feces, fish and food and the like at the bottom of the carrier enter the interlayer, then the water flow continuously drives the impurities such as fish and shrimp feces, fish and food and the, then enters the backwater pool 10 through the second pipeline 11, and oxygen is mixed into the water through the inner pipe 13 by the action of the water flow in the process.

To above-mentioned three kinds of structures of collecting impurity in breeding groove 1, all can set up the drain in the bottom of return water pond 10, can be with the sedimentary impurity discharge in return water pond 10 bottom, the drain can set up the valve, perhaps sets up vertical pipeline in return water pond 10 and plugs up the drain, when needs discharge filth impurity, extracts vertical pipeline alright open the drain.

The water channel circulation speed of 3 cell bodies of planting groove nitrify influences filterable efficiency slowly in the overlength, consequently can set up the planting groove 3 that nitrifies of different quantity in order to dispose the breed groove 1 of different capacity, and the great planting groove 3 that just needs more nitrify of breeding groove 1 comes the purification of completion water, consequently can plant the groove 3 design for a plurality of settings side by side with nitrifying.

The quantity of the nitrification planting tanks 3 is matched with the volume of the culture tank 1, more exactly, the nitrification planting tanks 3 are related to culture varieties, density, environmental conditions, protein content of feed, feeding amount and the like, and the principle is that the larger the filtration volume of the nitrification planting tanks 3 is, the better the filtration effect is, and the higher the feeding density and safety are; the ratio of the culture tank 1 to the nitrification planting tank 3 is 1:1 or 1:2 in a common situation, and the later specific situation can be adjusted according to the specific use situation due to a great number of influencing factors.

As an optional implementation manner of the embodiment of the present invention, in order to make the backwater more convenient, when a plurality of nitrification planting tanks 3 are used, one ends of the plurality of nitrification planting tanks 3 far away from the fermentation filter device 2 need to be communicated through a communication pipe 15, one end of one of the nitrification planting tanks 3 far away from the fermentation filter device 2 is provided with a clean water tank 16, and the clean water tank 16 is provided with a backwater pump 17; an independent backwater bin can be arranged to collect the purified water of the plurality of nitrification planting tanks 3 into the backwater bin, and a backwater pump 17 is arranged in the backwater bin to return water uniformly; one end of the first pipeline 6 is connected to the water return pump 17, the other end of the first pipeline 6 is arranged above the culture tank 1, the surfing and oxygen mixing effects are achieved by means of water flow, and the flow of the surface water body is pushed to form water flow internal circulation. Generally, a circular or oval pool is mostly in a plug-flow rotating mode, a square pool is pushed to a deep water level from a shallow water level along a natural slope, the purpose is to push water flow to help excrement of the system to be collected in a centralized mode, and the plug-flow device preferably uses an oxygen mixing device to achieve the purpose of mixing air and dissolving oxygen and pushing water to flow.

As the embodiment of the utility model provides an optional implementation mode, can also nitrify the inside a plurality of water-blocking plates 18 that set up of storehouse 7, be provided with limbers 19 on the water-blocking plate 18, limbers 19 between two adjacent water-blocking plates 18 stagger the setting, the platelike structure of specific water-blocking plate 18 bar, when water-blocking plate 18 sets up inside the storehouse 7 of nitrifying, connect on the bottom and the both sides wall of nitrifying storehouse 7, and limbers 19 is close to nitrify one of them lateral wall of storehouse 7, this kind of setting makes rivers form S type when nitrifying storehouse 7 inside flow and flows, can fully contact with nitrifying filter material.

A filtering nitrification device 20 can be arranged between the return water tank 10 and the culture tank 1, the filtering nitrification device 20 is an independent device and is used for being used together with the fermentation filtering device 2 and the nitrification planting tank 3 in a comprehensive mode, the filtering nitrification device 20 is internally provided with filtering fermentation decomposition and nitrification reaction, and the function of filtering water can be independently realized by matching with pushing water to flow back, the device can be supplemented and used under the condition that the water purifying modes of the fermentation filtering device 2 and the nitrification planting tank 3 are insufficient, so that the normal growth of fishes and shrimps in the culture tank 1 is ensured, the device is specifically communicated with the return water tank 10 through a second water pump arranged in the return water tank 10, the water outlet of the filtering nitrification device 20 is communicated with the culture tank 1, the pipeline of the filtration and nitrification device 20 communicated with the culture tank 1 is positioned above the culture tank 1, so that the surfing and oxygen mixing effects are realized by means of water flow, and the flow of the surface water body is pushed to form water flow internal circulation; therefore, special oxygenation equipment can be matched on the culture tank 1 to ensure oxygenation.

The nitrification planting tank 3 can also adopt a mode of combining the tank body 4 and the supporting structure 5 as the culture tank 1 to plant, and the functions of realizing the integral modularization of the fish-vegetable symbiotic system and avoiding the land solidification are realized.

In order to realize better filtering and planting effects, the nitrification planting tank 3 can adopt a tide nitrification planting tank, the mode of the tide inside the nitrification planting tank 3 realizes the change of the high and low water level tides, the tide nitrification planting tank can be widely combined with the nitrification planting tank 3 in the practical use process simply, the mode of realizing the tide has a physical method and an electronic control method, the tide mode adopts an electric control tide mode, the time, namely the frequency, of the tide interval starting can be controlled at will, and the flexible regulation and control under different environments in different seasons aiming at different plants are realized. Some special plants suitable for water culture can also adopt the traditional water culture form, namely the upper part of the nitrification bin 7 at the lower part of the nitrification planting groove 3 is cultured by water culture, the floating plate is used for punching and utilizing the planting cup to fix the planted vegetable, the root system part of the plant is exposed in the air, and the part of the plant grows in the water, and the planting groove can realize the water culture planting effect without tide.

The mode of automatically controlled morning and evening tides includes highest water level and minimum water level, and the plant is planted at the position above highest water level, and the root system can extend to below the highest water level downwards that the plant grows up, and normal water level is at minimum water level, and morning and evening tides start the water level and rise to the most high water level point plant root system and absorb moisture and nitrate and purify the water. The tide control adopts timing or remote control of the Internet of things, so that accurate tide as required can be realized, and the requirements of filtration and plant growth are met.

The fermentation filter equipment 2 that this application embodiment provided is the fermentation filter bag, realizes organic matters such as fish excrement shrimp excrement and concentrates filtration and fermentation decomposition effect for the fermentation.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a fish-vegetable symbiotic system, its characterized in that, includes breed groove (1), fermentation filter equipment (2) and nitrifies and plants groove (3), breed groove (1) including cell body (4) and setting up cell body (4) outside bearing structure (5), breed groove (1) fermentation filter equipment (2) with nitrify and plant groove (3) and communicate in proper order, nitrify and plant groove (3) and keep away from the one end of fermentation filter equipment (2) through first pipeline (6) with breed groove (1) intercommunication, nitrify and plant groove (3) by supreme storehouse (7), baffle (8) and the planting medium (9) of nitrifying that set gradually down, nitrify the filter material of nitrifying the inside packing of storehouse (7).

2. A fish and vegetable symbiotic system according to claim 1, further comprising a water return tank (10) with one end communicated with the culture tank (1) and the other end communicated with the fermentation filtering device (2), wherein the bottom of the culture tank (1) is an inverted cone-shaped bottom, the water return tank (10) is communicated with the lowest end of the bottom of the culture tank (1) through a second pipeline (11), and the water return tank (10) is communicated with the fermentation filtering device (2) through a first water pump (12).

3. A fish and vegetable symbiotic system according to claim 2, wherein the second pipe (11) is arranged on the side wall near the bottom of the return pond (10), and a screen structure (21) is arranged at the position where the second pipe (11) is communicated with the bottom of the culture tank (1).

4. A aquaponics system according to claim 1, wherein said nitrification planting tank (3) is provided in plurality side by side.

5. A fish and vegetable co-production system according to claim 2, characterized in that an inner pipe (13) connected with the second pipeline (11) and an outer pipe (14) sleeved outside the inner pipe (13) are vertically arranged in the cultivation tank (1), the highest end of the inner pipe (13) is flush with the highest water level of the cultivation tank (1), the height of the outer pipe (14) is higher than that of the inner pipe (13), and the bottom of the outer pipe (14) is provided with a water passing part with meshes.

6. The fish-vegetable symbiotic system according to claim 4, wherein the end of the nitrification planting tanks (3) far away from the fermentation filter device (2) is communicated through a communication pipe (15), a clear water tank (16) is arranged at the end of one nitrification planting tank (3) far away from the fermentation filter device (2), a water return pump (17) is arranged on the clear water tank (16), and the first pipeline (6) is connected to the water return pump (17).

7. The fish and vegetable symbiotic system according to claim 1, wherein a plurality of water blocking plates (18) are arranged inside the nitrification bin (7), water through holes (19) are formed in the water blocking plates (18), and the water through holes (19) between every two adjacent water blocking plates (18) are arranged in a staggered mode.

8. A fish and vegetable symbiotic system according to claim 2, wherein a filtration and nitrification device (20) is further arranged between the water return tank (10) and the culture tank (1), the filtration and nitrification device (20) is communicated with the water return tank (10) through a second water pump arranged inside the water return tank (10), and a water outlet of the filtration and nitrification device (20) is communicated with the culture tank (1).

9. A aquaponics system according to claim 1, wherein said support structure (5) is a steel frame structure and said trough (4) is a composite PVC membrane or canvas.

10. The fish-vegetable symbiotic system according to claim 1, wherein the nitrifying filter material is a filter ball filled with natural minerals inside; the fermentation filter device (2) is a fermentation filter bag.