CN220449919U - Cultivation circulating water treatment system comprising air supply - Google Patents

Abstract

The utility model discloses a cultivation circulating water treatment system comprising air supply, which comprises a plurality of biological treatment tanks which are sequentially communicated, wherein a first water containing space is respectively formed by the biological treatment tanks, and the first water containing space comprises a bottom wall; a plurality of parallel V-shaped grooves are formed on the bottom wall; a plurality of drain pipes are fixed at the bottom end of each groove along the length direction of the groove, and comprise an upper circumference and a lower circumference; the circumference of the upper part is provided with a plurality of through holes which are positioned in the groove; the lower circumference is buried below the groove; the plurality of branch aeration pipes are uniformly arranged above the grooves and fixedly connected with the bottom walls between the adjacent grooves; the aeration heads are respectively and uniformly arranged on the upper sides of the branch aeration pipes and fixedly connected and communicated with the branch aeration pipes; the plurality of main aeration pipes are respectively and correspondingly arranged in each biological treatment tank and are respectively connected and communicated with one end of each aeration pipe in the same biological treatment tank. The cultivation circulating water treatment system improves the oxygenation efficiency and uniformity of air supply and simultaneously improves the sedimentation pollution discharge effect.

Description

Cultivation circulating water treatment system comprising air supply

Technical Field

The utility model belongs to the technical field of aquaculture, and particularly relates to a aquaculture circulating water treatment system comprising air supply.

Background

The circulating water culture mode is a novel efficient culture mode, and takes the recycling of purified culture water as a core characteristic, and the energy, water and land are saved. All or part of the aquaculture water can be recycled through a series of treatments such as physical filtration, biological purification, sterilization, disinfection, degassing and oxygenation on the aquaculture water. The circulating water culture system is mainly divided into two major parts of a culture pond and a water treatment area, wherein a biological pond in the water treatment area has the effects of culturing nitrifying bacteria, removing ammonia nitrogen, nitrite and the like, and is an indispensable major link in the circulating water culture system, but the problem that the setting of degassing and oxygenation equipment is contradictory to the construction of a sewage draining structure generally exists, namely, the sewage draining slope structure enables aeration equipment to be incapable of being uniformly arranged, and the generation efficiency of nitrifying bacteria in the biological pond is affected.

Disclosure of Invention

The utility model provides a cultivation circulating water treatment system comprising air supply, which improves the oxygenation efficiency and uniformity and simultaneously improves the sedimentation pollution discharge effect.

In order to solve the technical problems, the utility model is realized by adopting the following technical scheme:

a aquaculture circulating water treatment system comprising an air supply comprising:

a plurality of biological treatment tanks which are communicated in sequence and respectively form a first water containing space, wherein the first water containing space comprises a bottom wall; a plurality of V-shaped grooves which tend to be arranged in parallel are formed on the bottom wall;

a plurality of drain pipes which are respectively fixed at the bottom ends of the grooves along the length direction of the grooves and comprise an upper circumference and a lower circumference; the upper circumference is located within the groove; the lower circumference is buried below the groove; a plurality of through holes which are uniformly distributed are formed on the circumference of the upper part and are used for discharging sediment through reaching the inside of the sewage discharge pipe;

the plurality of branch aeration pipes are uniformly arranged above the grooves and fixedly connected with the bottom walls between the adjacent grooves;

the plurality of aeration heads are respectively and uniformly arranged on the upper sides of the branch aeration pipes, are fixedly connected and communicated with the corresponding branch aeration pipes and are used for realizing aeration through the air supply of the branch aeration pipes;

the plurality of total aeration pipes are respectively and correspondingly arranged in the biological treatment tanks and are respectively connected and communicated with one end of each branch aeration pipe in the same biological treatment tank.

According to some specific embodiments of the present application, the aeration device further comprises a plurality of control valves, which are respectively arranged at the connection parts of the branch aeration pipes and the total aeration pipes, and are used for respectively controlling whether the branch aeration pipes are communicated with the total aeration pipes or not and the communication opening degree.

According to some specific embodiments of the present application, each of the grooves is disposed adjacent to one another in sequence; each branch aeration pipe is longitudinally arranged relative to each groove.

According to some specific embodiments of the present application, the biological treatment tank further comprises a biological film filler, which is a granular bulk material, placed in each of the biological treatment tanks, for reacting with oxygen to produce a biological film;

the diameter of the through hole is smaller than that of the biofilm packing.

According to some specific embodiments of the present application, the upper circumference is half or less than half of the full circumference of the drain pipe.

According to some specific embodiments of the present application, adjacent biological treatment tanks share an intermediate partition wall; at least one first communication port is arranged at the lower end of the middle partition wall and is used for cascading adjacent biological treatment tanks;

further comprising a plurality of grating elements; the distance between the gratings is smaller than the size of the biofilm packing; the grid piece is in installation fit with the first communication ports and is respectively and fixedly installed on each first communication port and used for blocking the biofilm packing from entering the first communication ports.

According to some specific embodiments of the present application, the biological treatment tank includes two biological treatment tanks, which are respectively arranged transversely or longitudinally to form a primary biological treatment tank and a secondary biological treatment tank;

the device also comprises a micro-filter tank and a pump tank which are respectively positioned at one side of the primary biological treatment tank away from the secondary biological treatment tank; the micro-filter tank is provided with a second water containing space, is connected with the culture tank and receives circulating water in the culture tank; the micro-filter pool comprises a micro-filter which is arranged in the second water containing space and is used for filtering out tiny particles in the circulating water in the second water containing space;

the pump pool is connected and communicated with the micro-filter pool, and the circulating water passing through the micro-filter pool is lifted into the primary biological treatment pool.

According to some specific embodiments of the present application, the apparatus further comprises a uv tank, which is located at a side of the secondary biological treatment tank away from the primary biological treatment tank, is communicated with the lower end of the secondary biological treatment tank, and is used for flowing the circulating water of the secondary biological treatment tank into the uv tank;

the uv cell is formed with a third water containing space comprising uv equipment; the uv device is arranged in the third water containing space and is used for carrying out ultraviolet sterilization on the circulating water in the third water containing space.

According to some specific embodiments of the present application, the system further comprises a comprehensive regulating tank, wherein the comprehensive regulating tank is positioned on one side of the secondary biological treatment tank away from the primary biological treatment tank, is adjacent to the uv tank and is communicated with the upper end of the secondary biological treatment tank, and receives the circulating water overflowed from the outlet at the upper end of the uv tank after being treated by the uv tank;

the comprehensive regulating tank comprises an acid regulator adding module, an alkaline regulator adding module and a temperature regulator, and is used for regulating the PH value and the temperature of the circulating water in the comprehensive regulating tank.

According to some specific embodiments of the present application, the aeration device is connected to the integrated regulating tank and the culture tank, and is used for aerating the circulating water flowing in from the integrated regulating tank and discharging the circulating water into the culture tank.

Compared with the prior art, the utility model has the advantages and positive effects that: according to the culture circulating water treatment system comprising air supply, the plurality of V-shaped grooves which are parallel are arranged at the bottom of the biological culture pond, so that the inclination angles of the side walls of the grooves have larger adjustment space, the occupied area of the grooves cannot be influenced due to the arrangement of different inclination angles of the side walls, the guiding effect on sediment particles is optimal, and the overall flatness of the bottom wall cannot be influenced; each aeration pipe is positioned above each groove and is fixedly connected with the bottom wall between every two adjacent grooves, so that the installation difficulty of each aeration pipe is reduced, the installation quality and uniformity of each aeration pipe are improved, the uniformity of each aeration head arranged on each aeration pipe is improved, the aeration uniformity in a biological treatment tank is further improved, biological fillers positioned in the biological treatment tank are fully aerated, the utilization rate of the biological fillers and the reaction rate of harmful substances in circulating water are improved, and the treatment efficiency of the circulating water is improved. The biological treatment tanks of the cultivation circulating water treatment system are internally and uniformly provided with a plurality of grooves for sewage discharge and the structures that the aeration pipes are uniformly arranged above the grooves, so that the biological treatment tanks have the advantages of high utilization rate of biofilm packing, high water treatment efficiency and high sewage discharge efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an embodiment of an overhead view of an aquaculture circulating water treatment system including an air supply according to the present utility model;

FIG. 2 is a schematic cross-sectional view of an embodiment of the aquaculture circulating water treatment system of FIG. 1 in one direction;

FIG. 3 is a schematic view of a partially enlarged structure at B in FIG. 2;

FIG. 4 is a schematic cross-sectional view of a drain pipe in an installed state;

FIG. 5 is a schematic end view of another embodiment of a aquaculture circulating water treatment system including an air supply according to the present utility model;

fig. 6 is a partially enlarged schematic view of the structure at C in fig. 5.

In the drawing the view of the figure,

1. a biological treatment tank; 3. a microfilter cell; 4. a pump pool; 5. a uv pool; 6. a comprehensive regulating tank; 7. oxygenation equipment; 8. a second communication port; 9. a third communication port; 10. a barrier web; 20. biofilm packing; 11. a primary biological treatment tank; 12. a secondary biological treatment tank; 13. a bottom wall; 14. a groove; 15. a first water containing space; 16. an intermediate partition wall; 161. a first communication port; 17. a blow-down pipe; 171. an upper circumference; 172. a lower circumference; 173. a through hole; 18. a grid member; 101. grid holes; 21. a bronchus; 22. an aeration head; 23. total aeration pipe; 24. a control valve; 31. a second water containing space; 32. a micro-filter; 41. a water pump; 51. a third water containing space; 52. uv device; 61. and a fourth water containing space.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

Referring to fig. 1, 2, 3, 4, 5 and 6, the present utility model discloses a cultivation circulating water treatment system including an air supply, which includes a plurality of biological treatment tanks 1, a plurality of sewage pipes 17, a plurality of branch aeration pipes 21, a plurality of aeration heads 22 and a plurality of total aeration pipes 23, which are sequentially communicated.

Each biological treatment tank 1 is respectively provided with a first water containing space 15 for placing a biological film filler 20 and containing circulating water to be treated, so that the circulating water reacts with the biological film on the biological film filler 20, and the quality of the circulating water is improved; the biological treatment tank 1 comprises a bottom wall 13 at the lower end, on which a plurality of V-shaped grooves 14 are formed, which are intended to be arranged in parallel, comprising two side walls with an inclination angle for guiding the precipitated waste particles falling onto them to slide down to the bottom of the grooves 14.

Each drain pipe 17 is a cylindrical conduit and is fixedly arranged at the bottom end of each groove 14 along the length direction of each groove 14; the drain 17 includes an upper circumference 171, a lower circumference 172; the upper circumference 171 is located in the groove 14, and has a plurality of through holes 173 uniformly distributed thereon for depositing the waste particles to be discharged through the drain pipe 17 by falling into the drain pipe 17; the lower circumference 172 is buried under the groove 14.

Each aeration pipe 21 is uniformly arranged above the grooves 14 and fixedly connected with the bottom wall 13 between the adjacent grooves 14; since the bottom walls 13 between the adjacent grooves 14 are easily kept at an equal height, the difficulty in fixing each of the aeration pipes 21 is reduced, the arrangement uniformity of each of the aeration pipes 21 is improved, and the aeration uniformity is further improved when aeration is performed through each of the aeration pipes 21. Each aeration head 22 is uniformly arranged on the upper side of each aeration pipe 21, fixedly connected and communicated with the corresponding aeration pipe 21, and is used for realizing uniform aeration through the air supply of each aeration pipe 21.

The total aeration pipes 23 are respectively and fixedly arranged in the biological treatment tanks 1, are respectively connected and communicated with one end of each aeration pipe 21 in the same biological treatment tank 1, and are used for providing high-pressure air or oxygen for each aeration pipe 21.

According to the culture circulating water treatment system comprising air supply, the plurality of V-shaped grooves 14 which are parallel are arranged on the bottom wall of the biological culture pond, so that the inclination angle of the side wall of the groove 14 has a larger adjustment space, the occupation area of the groove 14 is not influenced by different inclination angles of the side wall, the guiding effect on precipitated waste particles is optimal, and the overall flatness of the bottom wall 13 is not influenced; each aeration pipe 21 is positioned above each groove 14 and is fixedly connected with the bottom wall 13 between the adjacent grooves 14, so that the installation difficulty of each aeration pipe 21 is reduced, the installation quality and uniformity of each aeration pipe 21 are improved, the uniformity of each aeration head 22 arranged on each aeration pipe is improved, the aeration uniformity in the biological treatment tank 1 is further improved, the biological filler positioned in the biological treatment tank is fully aerated, the utilization rate of the biological filler and the reaction rate of harmful substances in circulating water are improved, and the treatment efficiency of the circulating water is improved.

The biological treatment tanks 1 of the cultivation circulating water treatment system of the utility model are internally and uniformly provided with a plurality of grooves 14 for sewage disposal and the structures that the aeration pipes 21 are uniformly arranged above the grooves 14, so that each biological treatment tank 1 has the advantages of high utilization rate of the biofilm packing 20, high water treatment efficiency and high sewage disposal efficiency.

The detailed structure and principle of the cultivation circulating water treatment system of the present utility model will be described in detail by means of specific examples.

In a specific embodiment, referring to FIGS. 1, 2 and 5, the aquaculture circulating water treatment system further includes a plurality of control valves 24.

Each control valve 24 is respectively arranged at the joint of each branch aeration pipe 21 and the total aeration pipe 23, and is used for respectively controlling whether each branch aeration pipe 21 is communicated with the total aeration pipe 23 or not and the opening degree of the communication, and for respectively controlling whether each branch aeration pipe 21 is ventilated or not, controlling whether each aeration head 22 on each branch aeration pipe 21 is aerated or not and the aeration quantity, so that the aeration area and the aeration quantity are conveniently adjusted, and the adjustment efficiency is improved.

In a specific embodiment, referring to fig. 2 and 5, the aquaculture circulating water treatment system further includes a biofilm packing 20, which is a granular bulk material, placed in each biological treatment tank 1 for reacting with oxygen exploded from the aeration head 22 and generating a biofilm on the outside thereof, reacting with harmful substances in the circulating water.

The through-hole 173 provided on the drain pipe 17 has a diameter smaller than the diameter or size of the biofilm packing 20 and is used only for discharging precipitated waste particles, not the biofilm packing 20.

In a specific embodiment, referring to fig. 1, 2, 3, 4, 5, and 6, the upper circumference 171 is half of the full circumference of the drain pipe 17 or less than half of the full circumference of the drain pipe 17. That is, the upper circumference 171 is a half or smaller circumference of the drain pipe 17 on the upper side.

The cultivation circulating water treatment system of the embodiment reduces the water inflow surface during sewage discharge of the biological treatment tank 1, increases the siphon effect of the sewage discharge pipe 17 and improves the sewage discharge efficiency.

In a specific embodiment, referring to fig. 1, 2, 3, 4, 5 and 6, each of the branch aeration pipes 21 is longitudinally arranged relative to each of the grooves 14, so that the degree of freedom of the arrangement density of each of the branch aeration pipes 21 is increased, the design difficulty is reduced, and the uniformity is improved.

Of course, each aeration tube 21 may be disposed along the length direction of each groove 14, that is, each aeration tube 21 may be fixedly disposed along the length direction of the bottom wall 13 between adjacent grooves 14, that is, fixedly disposed on the bottom wall 13 between adjacent grooves 14 along the length direction of the grooves 14, and the speed of depositing the deposited waste particles into the grooves 14 may be influenced by adjusting the water flow speed and the aeration amount, thereby adjusting the speed of discharging the solid waste in the biological treatment tank 1.

In a specific embodiment, referring to fig. 1, 2, 3, 5 and 6, the grooves 14 are disposed adjacent to each other in sequence, so as to increase the number and distribution area of the grooves 14 on the bottom wall 13 and improve the dirt accumulation and pollution discharge effects.

In a specific embodiment, referring to fig. 5 and 6, the aquaculture circulating water treatment system further comprises a plurality of barrier nets 10 having a grid-like plate structure or a grid-like sheet-like extension structure formed with a plurality of uniformly arranged grid holes 101 having a size smaller than that of the biofilm carriers 20 for the passage of the precipitated waste particles but not the biofilm carriers 20, preventing the biofilm carriers 20 from sinking into the grooves 14 with the precipitated waste particles, affecting the fouling and oxidation of the biofilm carriers 20.

In a specific embodiment, referring to fig. 1, 2 and 5, adjacent biological treatment tanks 1 share an intermediate partition wall 16 for isolating adjacent biological treatment tanks 1; at least one first communication port 161 for cascade connection of adjacent biological treatment tanks 1 is formed at the lower end of the middle partition wall 16. That is, the circulating water used in one of the adjacent biological treatment tanks 1 after being treated flows into the other biological treatment tank 1 for further secondary treatment.

Also included are a plurality of grating elements 18, the distance between adjacent grating elements being less than the size of biofilm packing 20; the grill 18 is fitted with the first communication port 161; each grating member 18 is fixedly mounted on each first communication port 161 for blocking the first communication port 161 from being blocked when the biofilm packing 20 passes through the first communication port 161.

In a specific embodiment, referring to fig. 1, 2 and 5, each grating member 18 is located at a side of the first communication port 161 close to the upper biological treatment tank 1, and is used for blocking the biofilm packing 20 from entering the first communication port 161, so as to improve the reliability of preventing the first communication port 161 from being blocked.

In a specific embodiment, referring to fig. 1, 2 and 5, the biological treatment tanks 1 are two in number and are respectively arranged transversely or longitudinally to form a primary biological treatment tank 11 and a secondary biological treatment tank 12; that is, the primary biological treatment tank 11 is an upper biological treatment tank, and the secondary biological treatment tank 12 is a lower biological treatment tank.

The cultivation circulating water treatment system also comprises a micro-filter tank 3 and a pump tank 4 which are respectively arranged at one side of the primary biological treatment tank 11 far away from the secondary biological treatment tank 12; the micro filter tank 3 is formed with a second water containing space 31 which is connected with the culture tank and receives and accommodates the circulating water flowing out of the culture tank; the micro filter tank 3 includes a micro filter 32 provided in the second water containing space 31 for filtering out minute particles in the circulating water in the second water containing space.

The pump tank 4 is connected to and communicates with the micro-filter tank 3, and includes at least one water pump 41 for pumping the circulating water flowing into the pump tank 4 through the micro-filter tank 3 into the primary biological treatment tank 11.

In a specific embodiment, referring to fig. 1, 2 and 5, the cultivation circulating water treatment system further comprises a uv tank 5, which is positioned at one side of the secondary biological treatment tank 12 away from the primary biological treatment tank 11 and is communicated with the secondary biological treatment tank 12 through a second communication port 8 arranged at the lower end, so that circulating water treated by the secondary biological treatment tank 12 enters the uv tank 5 from the lower end.

The uv cell 5 is formed with a third water containing space 51 including a uv apparatus 52; uv apparatus 52 is disposed in third water containing space 51; ultraviolet disinfection and sterilization of the circulating water in the third water containing space 51

In a specific embodiment, referring to fig. 1, 2 and 5, the cultivation circulating water treatment system further includes a comprehensive adjustment tank 6, which is located at a side of the secondary biological treatment tank 12 away from the primary biological treatment tank 11, and a fourth water containing space 61 is formed adjacent to the uv tank 5 and is communicated with the uv tank through a third communication port 9 provided at an upper end, and circulating water in the uv tank 5 overflows to the comprehensive adjustment tank 6 through the third communication port 9.

The comprehensive regulating tank 6 comprises an acid regulator adding module, an alkaline regulator adding module and a water temperature regulating module, and is used for regulating the pH value and the temperature of circulating water in the comprehensive regulating tank 6; the PH value of the circulating water is the PH value of the circulating water.

In a specific embodiment, referring to fig. 1, 2 and 5, the cultivation circulating water treatment system further comprises an oxygenation device 7, which is respectively connected with the comprehensive adjustment tank 6 and the cultivation tank, and is used for oxygenation of the circulating water flowing out of the comprehensive adjustment tank 6 and then discharging the circulating water into the cultivation tank for cultivation.

In a specific embodiment, referring to fig. 1, 2 and 5, the pump tank 4 is located at the rear end of the primary biological treatment tank 11; the micro-filter tank 3 is positioned at the front end of the primary biological treatment tank 11; the uv cell 5 is positioned at the rear end of the secondary biological treatment cell 12; the comprehensive regulating tank 6 is positioned in the middle of the secondary biological treatment tank 12; the oxygenation device 7 is positioned at the front end of the secondary biological treatment tank 12.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A aquaculture circulating water treatment system including an air supply, comprising:

a plurality of biological treatment tanks which are communicated in sequence and respectively form a first water containing space, wherein the first water containing space comprises a bottom wall; a plurality of V-shaped grooves which tend to be arranged in parallel are formed on the bottom wall;

a plurality of drain pipes which are respectively fixed at the bottom ends of the grooves along the length direction of the grooves and comprise an upper circumference and a lower circumference; the upper circumference is located within the groove; the lower circumference is buried below the groove; a plurality of through holes which are uniformly distributed are formed on the circumference of the upper part and are used for discharging sediment through reaching the inside of the sewage discharge pipe;

the plurality of branch aeration pipes are uniformly arranged above the grooves and fixedly connected with the bottom walls between the adjacent grooves;

the plurality of aeration heads are respectively and uniformly arranged on the upper sides of the branch aeration pipes, are fixedly connected and communicated with the corresponding branch aeration pipes and are used for realizing aeration through the air supply of the branch aeration pipes;

the plurality of total aeration pipes are respectively and correspondingly arranged in the biological treatment tanks and are respectively connected and communicated with one end of each branch aeration pipe in the same biological treatment tank.

2. The aquaculture circulating water treatment system according to claim 1 further comprising a plurality of control valves respectively provided at the connection of each of the branch aeration pipes and the main aeration pipe for respectively controlling whether each of the branch aeration pipes and the main aeration pipe are connected and the opening degree of the connection.

3. The aquaculture circulating water treatment system of claim 1 wherein each of the grooves is disposed adjacent one another in sequence; each branch aeration pipe is longitudinally arranged relative to each groove.

4. The aquaculture circulating water treatment system of claim 1 further comprising biofilm carriers in the form of particulate bulk material disposed in each of the biological treatment tanks for reacting with oxygen to produce a biofilm;

the diameter of the through hole is smaller than that of the biofilm packing.

5. The aquaculture circulating water treatment system of claim 4 wherein the upper circumference is half or less than half of the entire circumference of the drain pipe.

6. The aquaculture circulating water treatment system of claim 4 wherein adjacent biological treatment tanks share an intermediate wall; at least one first communication port is arranged at the lower end of the middle partition wall and is used for cascading adjacent biological treatment tanks;

further comprising a plurality of grating elements; the distance between the gratings is smaller than the size of the biofilm packing; the grid piece is in installation fit with the first communication ports and is respectively and fixedly installed on each first communication port and used for blocking the biofilm packing from entering the first communication ports.

7. A aquaculture circulating water treatment system according to any one of claims 1 to 6 wherein the biological treatment tanks comprise two, each arranged transversely or longitudinally, forming a primary biological treatment tank, a secondary biological treatment tank;

the device also comprises a micro-filter tank and a pump tank which are respectively positioned at one side of the primary biological treatment tank away from the secondary biological treatment tank; the micro-filter tank is provided with a second water containing space, is connected with the culture tank and receives circulating water in the culture tank; the micro-filter pool comprises a micro-filter which is arranged in the second water containing space and is used for filtering out tiny particles in the circulating water in the second water containing space;

the pump pool is connected and communicated with the micro-filter pool, and the circulating water passing through the micro-filter pool is lifted into the primary biological treatment pool.

8. The aquaculture circulating water treatment system of claim 7 further comprising a uv cell located on a side of the secondary biological treatment cell remote from the primary biological treatment cell in communication with the lower end of the secondary biological treatment cell, the circulating water for the secondary biological treatment cell flowing into the uv cell;

the uv cell is formed with a third water containing space comprising uv equipment; the uv device is arranged in the third water containing space and is used for carrying out ultraviolet sterilization on the circulating water in the third water containing space.

9. The aquaculture circulating water treatment system of claim 8 further comprising an integrated conditioning tank located on a side of the secondary biological treatment tank remote from the primary biological treatment tank, adjacent to and in upper communication with the uv tank, for receiving the circulating water treated by the uv tank and overflowed from an outlet at the upper end of the uv tank;

the comprehensive regulating tank comprises an acid regulator adding module, an alkaline regulator adding module and a temperature regulator, and is used for regulating the PH value and the temperature of the circulating water in the comprehensive regulating tank.

10. The aquaculture circulating water treatment system of claim 9 further comprising oxygenation apparatus connected to the integrated conditioning tank and the aquaculture tank, respectively, for oxygenation of the circulating water flowing in from the integrated conditioning tank and discharge into the aquaculture tank.