Circulating aquaculture denitrification system

Abstract

The utility model discloses a circulating water culture denitrification system, which is characterized in that a hollow support part is arranged in a denitrification biological tank and divides the internal space of the denitrification biological tank into an upper space area and a lower space area which are communicated up and down, a water inlet pipe supplies water to the lower space area, and the water inlet pipe comprises a first sub water inlet pipe; the first sub water inlet pipe is located in the lower space area, a water through hole is formed in the pipe wall of the first sub water inlet pipe, the blow-off pipe is arranged at the bottom of the lower space area, the upper space area is filled with the denitrification filler, and the stirring device is arranged in the upper space area and is configured to stir the denitrification filler. The carbon source adding device is configured to add a carbon source into the water inlet pipe. The denitrification system is good in denitrification effect, and effectively reduces the treatment burden of the tail water of the recirculating aquaculture.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture technology, and in particular to a recirculating aquaculture denitrification system. Background Technology

[0002] In recirculating aquaculture systems (RAS), the metabolic byproducts of farmed organisms and uneaten food cannot be decomposed in a timely manner, leading to a rapid accumulation of ammonia nitrogen and nitrite in the water. Furthermore, the high stocking density and limited water volume in RAS systems cause rapid deterioration of the water quality, potentially resulting in mass mortality of farmed organisms and significant economic losses. Ammonia nitrogen and nitrite are highly toxic to farmed organisms and are currently major water pollutants in aquaculture.

[0003] Currently, nitrogen removal is partly addressed in the recirculating water system, and most of the treatment is done through nitrification-denitrification in biological ponds. However, this method has poor nitrogen removal efficiency and practicality, increasing the burden on recirculating aquaculture wastewater treatment.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems mentioned in the background art, this utility model proposes a denitrification system for recirculating aquaculture, which has a good denitrification effect and effectively reduces the burden of wastewater treatment in recirculating aquaculture.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] In some embodiments of this application, a recirculating aquaculture denitrification system is provided. A hollow support is provided in the denitrification biological tank, which divides the internal space of the denitrification biological tank into an upper space region and a lower space region that are connected vertically. A water inlet pipe supplies water to the lower space region. The water inlet pipe includes a first sub-inlet pipe located in the lower space region. The first sub-inlet pipe has water passage holes on its pipe wall. A sewage pipe is located at the bottom of the lower space region. Denitrification packing is filled in the upper space region. A stirring device is located in the upper space region and is configured to stir the denitrification packing. A carbon source adding device is configured to add carbon source into the water inlet pipe.

[0008] Beneficial effects: The recirculating aquaculture denitrification system of this application divides the interior of the denitrification biological tank into an upper space area and a lower space area arranged vertically and connected by a hollow support part. The lower space area is equipped with an inlet pipe and a drain pipe, while the upper space area is equipped with a stirring device and filled with denitrification packing material.

[0009] The denitrification system is located in the water treatment stage of recirculating aquaculture. After being filtered by a microfilter, the water is pumped into both the denitrification and nitrification biological tanks. The water flows into the lower space area through the inlet pipe and then flows evenly upwards to the upper space area, where aerobic denitrification occurs first, followed by anaerobic denitrification.

[0010] The denitrification system operates independently from the nitrification system, without interfering with each other, ensuring the normal and stable operation of recirculating aquaculture and significantly improving nitrogen removal efficiency.

[0011] With the drain pipe positioned at the bottom, there is no need to stop the system's normal water intake during sewage flushing. Sewage can be discharged at any time, and the normal aquaculture of the circulating water system will not be affected during sewage discharge.

[0012] The perforated support section, with its evenly distributed perforated structure, ensures uniform water replenishment, allowing water from the lower space to flow evenly upwards into the upper space, thus improving denitrification and ensuring the normal operation of the bottom drainage system.

[0013] The denitrification packing material is stirred by a stirring device to ensure a low dissolved oxygen environment and improve the denitrification effect. When the denitrification packing material is severely clogged, it can be cleaned by the stirring device, ensuring a low-oxygen environment for denitrification while shaking the sludge to the bottom as much as possible.

[0014] In some embodiments of this application, the first sub-inlet pipe is located below and close to the hollow support portion, and the first sub-inlet pipe extends along the extension direction of the hollow support portion.

[0015] In some embodiments of this application, the first sub-inlet pipe has a plurality of spaced water passage holes on its pipe wall.

[0016] In some embodiments of this application, the water inlet pipe further includes a second sub-water inlet pipe, which extends downward through the upper space region into the lower space region. The second sub-water inlet pipe is connected to the first sub-water inlet pipe, and the carbon source adding device adds a carbon source into the second sub-water inlet pipe.

[0017] In some embodiments of this application, at least one recessed area is provided at the bottom of the lower space region, and the inlet of the sewage pipe is located at the bottom of the recessed area.

[0018] In some embodiments of this application, the bottom of the lower space region is provided with a plurality of recessed regions arranged at intervals, and a drain outlet is provided at the bottom of any of the recessed regions.

[0019] In some embodiments of this application, the denitrification packing includes biospheres, the interior of which is filled with polyurethane sponge.

[0020] In some embodiments of this application, the hollow support portion is made of tempered glass, and the tempered glass forms a hollow grid structure.

[0021] In some embodiments of this application, a detection instrument is also included, which is configured to detect dissolved oxygen data in the water inlet pipe.

[0022] In some embodiments of this application, the water inlet pipe is connected to the clean water outlet pipe of the microfiltration machine.

[0023] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural diagram of a recirculating aquaculture denitrification system according to some embodiments.

[0026] Figure label:

[0027] 100. Denitrification biological tank; 110. Upper space area; 120. Lower space area; 130. Depressed area;

[0028] 200. Hollowed-out support section;

[0029] 300, Inlet pipe; 310, First sub-inlet pipe; 320, Second sub-inlet pipe;

[0030] 400. Sewage pipe;

[0031] 500, Denitrification packing material;

[0032] 600. Stirring device;

[0033] 700. Carbon source addition device;

[0034] 800. Testing instruments. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] In some embodiments of this application, a recirculating aquaculture denitrification system is provided, with reference to... Figure 1 It is used in recirculating aquaculture systems and belongs to the denitrification module of the entire recirculating aquaculture system.

[0042] The recirculating aquaculture denitrification system includes a denitrification biological tank 100. The denitrification biological tank 100 is constructed underground.

[0043] The recirculating aquaculture denitrification system also includes a perforated support section 200, which is installed inside the denitrification biological tank 100. The perforated support section 200 divides the internal space of the denitrification biological tank 100 into an upper space region 110 and a lower space region 120. The upper space region 110 and the lower space region 120 are connected, and the upper space region 110 is located above the lower space region 120. The two are arranged vertically.

[0044] The recirculating aquaculture denitrification system also includes an inlet pipe 300, which is configured to supply water to the denitrification biological tank 100, for example, to the downward space area 120.

[0045] The water inlet pipe 300 includes a first sub-water inlet pipe 310, which is located in the lower space region 120. The first sub-water inlet pipe 310 has water passage holes on its pipe wall. The first sub-water inlet pipe 310 acts as a water distribution pipe. The water in the first sub-water inlet pipe 310 flows out evenly through the water passage holes and rises upward into the upper space region 110.

[0046] The recirculating aquaculture denitrification system also includes a drain pipe 400, which is located at the bottom of the lower space region 120. Denitrifying bacteria decay and accumulate at the bottom of the lower space region 120, and are discharged through the drain pipe 400.

[0047] By placing the sewage pipe 400 at the bottom, sewage can be discharged at any time without affecting the normal aquaculture of the circulating water system. This is different from some existing technologies where backwashing can affect normal operation.

[0048] The recirculating aquaculture denitrification system also includes denitrification packing material 500, which is filled in the upper space area 110. The denitrification packing material 500 creates an anaerobic environment to promote denitrification.

[0049] The recirculating aquaculture denitrification system also includes a stirring device 600, located in the upper space area 110, which is configured to stir the denitrification packing material 500. The stirring device 600 thoroughly stirs and mixes the denitrification packing material 500 to ensure a low dissolved oxygen environment.

[0050] The recirculating aquaculture denitrification system also includes a carbon source addition device 700, which is configured to add a carbon source into the inlet pipe 300 to ensure the normal operation of denitrification.

[0051] The recirculating aquaculture denitrification system of this application divides the interior of the denitrification biological tank 100 into an upper space region 110 and a lower space region 120 that are arranged vertically and connected by a hollow support part 200. The lower space region 120 is equipped with an inlet pipe 300 and a drain pipe 400, while the upper space region 110 is equipped with a stirring device 600 and denitrification packing material 500.

[0052] The denitrification system is located in the water treatment stage of recirculating aquaculture. After being filtered by a microfilter, the water is pumped into the denitrification biological tank 100 and the nitrification biological tank. The water flows into the lower space area 120 through the inlet pipe 300, and then flows evenly upward to the upper space area 110, where aerobic denitrification occurs first, followed by anaerobic denitrification.

[0053] The denitrification system operates independently from the nitrification system, without interfering with each other, ensuring the normal and stable operation of recirculating aquaculture and significantly improving nitrogen removal efficiency.

[0054] With the drain pipe positioned at the bottom (400mm), there is no need to stop the system's normal water intake during sewage flushing. Sewage can be discharged at any time, and the normal aquaculture of the circulating water system will not be affected during sewage discharge.

[0055] The perforated support section 200, with its evenly distributed perforated structure, plays a role in uniformly distributing water, allowing water in the lower space area 120 to flow evenly upwards into the upper space area 110, thereby improving the denitrification effect and ensuring the normal operation of the bottom sewage discharge.

[0056] The denitrification packing material 500 is stirred by the stirring device 600 to ensure a low dissolved oxygen environment and improve the denitrification effect. When the denitrification packing material 500 is severely clogged, it can be cleaned by the stirring device 600 to shake off as much sludge as possible to the bottom while ensuring a low-oxygen environment for denitrification.

[0057] In some embodiments of this application, the first sub-inlet pipe 310 is located below and close to the hollow support portion 200, and extends along the extension direction of the hollow support portion 200. In other words, the first sub-inlet pipe 310 extends in a horizontal direction.

[0058] The first sub-inlet pipe 310 is positioned near the hollow support section 200 to facilitate water flow into the upper space area 110. The first sub-inlet pipe 310 is spaced a certain distance from the bottom drain pipe 400 to avoid interfering with draining.

[0059] In some embodiments of this application, the first sub-inlet pipe 310 is provided with a plurality of spaced water passages on its pipe wall to improve water distribution.

[0060] In some embodiments of this application, the water inlet pipe 300 further includes a second sub-water inlet pipe 320, which extends downward from the upper space region 110 to the lower space region 120. The second sub-water inlet pipe 320 is connected to the first sub-water inlet pipe 310, and the carbon source adding device 700 adds a carbon source into the second sub-water inlet pipe 320.

[0061] The second sub-inlet pipe 320 extends vertically from the top of the denitrification biological tank 100 down into the lower space area 120, facilitating installation and connection to the carbon source addition device 700.

[0062] In some embodiments of this application, at least one recessed area 130 is provided at the bottom of the lower space region 120, and the inlet of the sewage pipe 400 is located at the bottom of the recessed area 130. Denitrifying bacteria decay and accumulate in the recessed area 130, which serves to collect the decaying denitrifying bacteria, facilitating sewage discharge and improving the sewage discharge efficiency.

[0063] In some embodiments of this application, the bottom of the lower space region 120 is provided with a plurality of spaced-apart recessed regions 130, and a drain outlet is provided at the bottom of any recessed region 130. The plurality of recessed regions 130 helps to improve the aggregation of denitrifying bacteria and further improve the sewage discharge effect.

[0064] In some embodiments of this application, the denitrification packing 500 includes biospheres, the interior of which is filled with polyurethane sponge.

[0065] Biospheres provide auxiliary support, ensuring uniform distribution of the sponge packing material. The sponge packing material's structure facilitates anaerobic environment formation while retaining its large specific surface area. For example, the biospheres have a diameter of 100mm to facilitate biofilm attachment.

[0066] In some embodiments of this application, the perforated support portion 200 is made of tempered glass, which forms a perforated grid structure. The tempered glass structure is reliable, and the perforated grid structure prevents the denitrification packing 500 from falling and damaging the water distribution of the first sub-inlet pipe 310, thus affecting sewage discharge.

[0067] In some embodiments of this application, the denitrification system further includes a detection instrument 800, which is configured to detect dissolved oxygen data in the inlet pipe 300. For example, the detection instrument 800 detects dissolved oxygen data in the first sub-inlet pipe 310. The control system controls the inlet flow rate and carbon source addition amount of the inlet pipe 300 based on the dissolved oxygen data fed back by the detection instrument 800, thereby achieving closed-loop control.

[0068] In some embodiments of this application, the inlet pipe 300 is connected to the clean water outlet pipe of the microfilter. The denitrification system is located in the water treatment stage of recirculating aquaculture. After being filtered by the microfilter, the water flows into the inlet pipe 300 through the clean water outlet pipe and enters the denitrification biological tank 100 for denitrification.

[0069] In some embodiments of this application, when the denitrification biological tank 100 is flushed, a high-pressure water gun is used to flush the inside of the biological tank, and the flushed wastewater is discharged through the drain pipe 400.

[0070] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0071] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A recirculating aquaculture denitrification system, characterized in that, Including: Denitrification biological tank; A hollow support section is installed inside the denitrification biological tank, dividing the internal space of the denitrification biological tank into an upper space region and a lower space region, wherein the upper space region and the lower space region are connected. A water inlet pipe is configured to supply water to the lower space area. The water inlet pipe includes a first sub-water inlet pipe located in the lower space area. A water passage hole is provided on the pipe wall of the first sub-water inlet pipe. The sewage pipe is located at the bottom of the lower space area; Denitrification packing material is filled in the upper space region; A stirring device, located in the upper space region, is configured to stir the denitrification packing material; A carbon source adding device is configured to add a carbon source into the water inlet pipe.

2. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The first sub-inlet pipe is located below and close to the hollow support portion, and extends along the extension direction of the hollow support portion.

3. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The first sub-inlet pipe has multiple spaced water passage holes on its pipe wall.

4. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The water inlet pipe also includes a second sub-water inlet pipe, which extends downward from the upper space region into the lower space region. The second sub-water inlet pipe is connected to the first sub-water inlet pipe, and the carbon source adding device adds carbon source into the second sub-water inlet pipe.

5. The recirculating aquaculture denitrification system according to claim 1, characterized in that, At least one recessed area is provided at the bottom of the lower space area, and the inlet of the sewage pipe is located at the bottom of the recessed area.

6. The recirculating aquaculture denitrification system according to claim 5, characterized in that, The bottom of the lower space region is provided with a plurality of recessed areas arranged at intervals, and a drain outlet is provided at the bottom of any of the recessed areas.

7. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The denitrification packing material includes biospheres, the interior of which is filled with polyurethane sponge.

8. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The hollow support part is made of tempered glass, and the tempered glass forms a hollow grid structure.

9. The recirculating aquaculture denitrification system according to claim 1, characterized in that, It also includes a detection instrument configured to detect dissolved oxygen data in the inlet pipe.

10. The recirculating aquaculture denitrification system according to claim 1, characterized in that, The inlet pipe is connected to the clean water outlet pipe of the microfiltration machine.

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