Integrated recirculating aquaculture tank

Abstract

This utility model relates to an integrated recirculating aquaculture tank, including a tank body comprising an inner pool and an outer pool. The inner pool is located inside the outer pool and contains a sludge collection and discharge assembly. Two microfilters are installed between the inner and outer pools. A four-way connector allows air to enter, preventing siphoning. Wastewater from the inner pool flows into the microfilters through the main and secondary pipes via the level difference between the inner and outer pools. After treatment by the microfilters, 5% of the wastewater is discharged through the drain pipe, while the supernatant enters a suspended particle collector and flows by gravity to the first, second, and third microbial fluidized beds. Microorganisms on the surface of the MBBR packing material in the microbial fluidized beds digest ammonia nitrogen and nitrates, before flowing to the pump pool. A submersible pump pumps the treated clean water back to the inner pool. The system consists of two recirculation systems with low total power consumption, consuming only 20-25% of the energy compared to traditional recirculating aquaculture systems. The water circulates once per hour, requiring minimal space, allowing for flexible terrain application, and accommodating high stocking densities.

Description

Technical Field

[0001] This utility model relates to the field of recirculating aquaculture technology, specifically to an integrated recirculating aquaculture tank. Background Technology

[0002] Aquaculture, as an industry for cultivating aquatic organisms, takes various forms, including large-scale earthen ponds, factory workshops, and small containers. The aquaculture tank, as the core carrier of the industry's miniaturization and intensification, is a concentrated embodiment of aquaculture technology in a small space: it is suitable for large-scale factory farming, can also meet the independent operation needs of individual farmers, and provides a highly efficient live animal holding system for supermarkets and hotels. However, the wastewater purification equipment of existing aquaculture tank systems relies on external electric water pumps for forced drive, which not only generates additional energy consumption and operating noise, but also causes the entire system to expand in size due to the external pipeline and separate microfiltration layout, thereby destroying the advantages of the miniaturized and intensive design of aquaculture tanks, and thus significantly weakening their high-density aquaculture potential and water-saving capabilities. Utility Model Content

[0003] The purpose of this invention is to provide an integrated recirculating aquaculture tank to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An integrated recirculating aquaculture tank includes a tank body comprising an inner tank and an outer tank. The inner tank is located inside the outer tank and contains a sludge collection and drainage assembly. Two microfilters are positioned between the inner and outer tanks. The left and right sides of the sludge collection and drainage assembly are connected to the central inlet pipes of the two microfilters. Several fixing strips are fixedly installed between the inner wall of the outer tank and the outer wall of the inner tank. Two purification components are positioned between the inner and outer tanks. Two submersible pumps are positioned between the inner and outer tanks. The outlets of the water supply pipes of the two submersible pumps are located above the inner tank. Baffles are fixedly installed between two adjacent fixing strips on the outer sides of the two microfilters. The two submersible pumps are adjacent to the corresponding baffles. An outlet is opened on the baffle on the side away from the submersible pump. The sludge discharge pipes of the two microfilters extend to the outer side of the outer tank.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the wastewater discharge assembly includes a main pipe, a secondary pipe, and a four-way connector. The main pipe is located inside the inner tank, the four-way connector is located on top of the main pipe, and there are two secondary pipes, both of which are connected to the interior of the four-way connector. The two secondary pipes are respectively connected to the central water inlet pipes of the two microfiltration units.

[0007] Furthermore, both purification components include a suspended particle collector, a first microbial fluidized bed, a second microbial fluidized bed, and a third microbial fluidized bed. The suspended particle collector is disposed between two baffles and located below the microfilter. A guide plate is also disposed between two adjacent baffles. The guide plate is inclined and its bottom is located next to the water outlet.

[0008] Furthermore, both purification components also include three partitions that separate the first microbial fluidized bed, the second microbial fluidized bed, and the third microbial fluidized bed. The three partitions are fixed by two adjacent fixing strips, and flow ports are provided at the bottom of the left and right partitions and at the top of the middle partition.

[0009] Furthermore, a pump pool is formed between the side of the baffle closest to the submersible pump and the nearest partition, and the submersible pump is disposed inside the pump pool.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The four-way connector allows air to enter, preventing siphoning. Wastewater from the inner pool flows into the microfilter through the main and auxiliary pipes via the level difference between the inner and outer pools. After treatment by the microfilter, 5% of the wastewater is discharged through the drain pipe, while the supernatant enters the suspended particle collector and flows by gravity to the first, second, and third microbial fluidized beds. In the microbial fluidized beds, microorganisms on the surface of the MBBR packing digest ammonia nitrogen and nitrates, and then the water flows to the pump pool. The treated clean water is pumped to the inner pool by a submersible pump. There are two sets of circulation systems in total, with low total power consumption. Compared with traditional circulating water solutions, the energy consumption is only 20-25%. The pool water is circulated once per hour, requiring little space, and is flexible in terms of terrain, allowing for high stocking density. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the integrated recirculating aquaculture tank of this utility model from one perspective. Figure 2 This is a top view of the integrated recirculating aquaculture tank of this utility model; Figure 3 This is a schematic diagram of the integrated recirculating aquaculture tank of this utility model from one of its perspectives. Figure 4 This is a structural schematic diagram of the integrated recirculating aquaculture tank of this utility model from another perspective.

[0012] The attached diagram lists the components represented by each number as follows: 1. Aquaculture tank body; 101. Inner tank; 102. Outer tank; 2. Wastewater collection and drainage assembly; 201. Main pipe; 202. Secondary pipe; 203. Four-way connector; 3. Microfilter; 4. Fixing strip; 5. Purification assembly; 501. Suspended particle collector; 502. First microbial fluidized bed; 503. Second microbial fluidized bed; 504. Third microbial fluidized bed; 505. Baffle; 506. Flow outlet; 6. Submersible pump; 7. Baffle; 8. Outlet; 9. Guide plate; 10. Pump pool. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Reference Figures 1-4 As shown, this utility model provides an integrated recirculating aquaculture tank, including a tank body 1. The tank body 1 includes an inner pool 101 and an outer pool 102. The inner pool 101 is located inside the outer pool 102. A sludge collection and discharge assembly 2 is installed inside the inner pool 101. Two microfilters 3 are installed between the outer pool 102 and the inner pool 101. (The two ends of the central water inlet pipes on both sides of the microfilter 3 are fixed to the pool walls of the inner pool 101 and the outer pool 102. A backwash water receiving tray (not marked in the figure) is installed above the central water inlet pipe inside the microfilter 3. Water outlets are evenly distributed below the central water inlet pipe to facilitate the discharge of filtered water. The backwashing and filtration steps of the microfilter 3 are well known to those skilled in the art, so they will not be described in detail.) The left and right sides of the sewage discharge component 2 are connected to the central water inlet pipes of the two microfilters 3 respectively. Several fixing strips 4 are fixedly installed between the inner wall of the outer pool 102 and the outer wall of the inner pool 101. Two purification components 5 are set between the outer pool 102 and the inner pool 101. Two submersible pumps 6 are set between the outer pool 102 and the inner pool 101. The water outlet of the water supply pipe of the two submersible pumps 6 is located above the inner pool 101. Baffles 7 are fixedly installed between the two adjacent fixing strips 4 on the outer side of the two microfilters 3. The items attached to the fixing strips 4 are fixedly installed with fasteners to ensure the convenience of subsequent maintenance and the firmness during use. The baffles 7 protect the microfilters 3 and ensure the stability during the water purification process. Two submersible pumps 6 are adjacent to baffles 7 on their respective sides. The baffle 7 on the side away from the submersible pumps 6 has an outlet 8. The drain pipes of the two microfilters 3 extend to the outside of the outer pool 102.

[0015] Under the action of the sewage discharge component 2, the sewage in the inner pool 101 is transported to the two microfilters 3 for filtration. The sewage is discharged through the sewage discharge pipe, and the supernatant after filtration is discharged through the central water inlet pipe of the microfilter 3 and enters the purification component 5 below. After being purified by the purification component 5, the purified water is drawn by the submersible pump 6 and transported to the inner pool 101 through the pipeline. At the same time, the purification effect of the pool water is enhanced by the cooperation of the two microfilters 3 and the two purification components 5. Under the action of the passive gravity flow principle of liquid level difference, the overall power is reduced.

[0016] The sewage discharge assembly 2 includes a main pipe 201, a secondary pipe 202, and a four-way connector 203. The main pipe 201 is located inside the inner tank 101, the four-way connector 203 is located on the top of the main pipe 201, there are two secondary pipes 202, and both are connected to the inside of the four-way connector 203. The two secondary pipes 202 are respectively connected to the central water inlet pipes of the two microfilters 3.

[0017] With this configuration, the main pipe 201 is vertically installed inside the inner tank 101, with its bottom extending close to the bottom of the inner tank 101 to ensure the discharge of sedimented bottom wastewater. The top of the main pipe 201 connects to the vertical interface of the four-way connector 203. The other two horizontal interfaces of the four-way connector 203 connect to two secondary pipes 202, one end of which is tightly connected to the four-way connector, and the other end extends into the outer tank to connect with the microfilter 3. The remaining interface of the four-way connector 203 is positioned upwards as an air inlet and kept unobstructed (no additional sealing is required, ensuring air can flow freely). When the water level in the inner tank 101 reaches a preset high level due to sewage accumulation or water replenishment, the sewage in the inner tank 101 will naturally flow into the main pipe 201 under the gravity effect generated by the liquid level difference. Then, it will be diverted to two secondary pipes 202 through the four-way connector 203 and finally flow into the outer tank 202 to enter the microfilter for filtration. The whole process does not require additional power, and because the four-way air inlet continuously introduces air, negative pressure will never be formed in the pipe, completely avoiding the problem of sewage backflow or abnormal drop in the water level of the inner tank caused by siphon phenomenon.

[0018] Each of the two purification components 5 includes a suspended particle collector 501, a first microbial fluidized bed 502, a second microbial fluidized bed 503, and a third microbial fluidized bed 504. The suspended particle collector 501 is located between two baffles 7 and below the microfilter 3. A guide plate 9 is also provided between two adjacent baffles 7. The guide plate 9 is inclined and its bottom is located next to the outlet 8.

[0019] This setup ensures that the supernatant discharged from the microfilter 3 is discharged from the bottom of the central inlet pipe and preferentially introduced into the suspended particle collector 501 by gravity potential energy. After the suspended particles are buffered by the porous media inside the suspended particle collector 501 and naturally reoxygenated, the water flows in a laminar state under the action of the guide plate 9 and the outlet 8, injecting the pool water from the bottom into the first microbial fluidized bed 502 for purification. Specific purification steps: The supernatant discharged after the wastewater is effectively intercepted by the microfilter 3 first flows into the suspended particle collector 501 for flow buffering and preliminary sedimentation. Under the action of the guide plate 9, the pool water after preliminary sedimentation is discharged through the outlet 8, and then enters the first microbial fluidized bed 502, the second microbial fluidized bed 503 and the third microbial fluidized bed 504 set in series for deep biological purification. In the three-stage microbial fluidized bed, a large number of suspended and flowing MBBR-specific biological packing materials provide a huge surface area for microorganisms to attach and grow. On the surface of these packing materials, a highly active biofilm is enriched and formed. The microbial community (mainly including nitrifying bacteria and denitrifying bacteria) in the biofilm efficiently digests and removes pollutants in the water through complex biochemical reactions. By controlling the dissolved oxygen conditions and packing material ratio at each stage, the nitrification and denitrification processes are optimized to ensure the efficient degradation of ammonia nitrogen, nitrate and organic pollutants at each stage, improving the final effluent water quality for use in recirculating aquaculture. Furthermore, the microbial fluidized bed is aerated by an oxygenation fan (not shown in the figure) to meet the activity requirements of microorganisms and improve reaction efficiency.

[0020] Each of the two purification components 5 includes three partitions 505, which separate the first microbial fluidized bed 502, the second microbial fluidized bed 503 and the third microbial fluidized bed 504. The three partitions 505 are fixed by two adjacent fixing strips 4. The bottom of the left and right partitions 505 and the top of the middle partition 505 are provided with flow ports 506.

[0021] This configuration, under the action of the flow inlet 506, enables the three-stage series microbial fluidized bed to adopt a unique baffle-type water flow design (first stage: bottom inlet, top outlet; second stage: top inlet, bottom outlet; third stage: bottom inlet, top outlet). This design significantly improves the denitrification efficiency and operational stability of the system by optimizing the hydraulic flow pattern and biochemical reaction environment: the alternating change of water flow direction (upward flow → downward flow → upward flow) forms a natural baffle, effectively breaking the channeling or dead zones that may be formed by a fixed flow direction, thereby further improving the purification effect.

[0022] Among them, the side of the baffle 7 closest to the submersible pump 6 forms a pump pool 10 between it and the nearest partition 505, and the submersible pump 6 is located inside the pump pool 10.

[0023] With this setup, the purified pool water enters the interior of the two pump pools 10 for extraction by the submersible pump 6, allowing the purified pool water to re-enter the inner pool 101, thus achieving the effect of water circulation.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated recirculating aquaculture tank comprising an aquaculture tank body (1), characterised in that: The aquaculture tank body (1) includes an inner tank (101) and an outer tank (102). The inner tank (101) is located inside the outer tank (102). A sludge collection and drainage assembly (2) is installed inside the inner tank (101). Two microfilters (3) are installed between the outer tank (102) and the inner tank (101). The left and right sides of the sludge collection and drainage assembly (2) are respectively connected to the central water inlet pipes of the two microfilters (3). Several fixing strips (4) are fixedly installed between the inner wall of the outer tank (102) and the outer wall of the inner tank (101). The outer tank (102) and the inner tank (101) are connected. 1) Two purification components (5) are arranged between the outer pool (102) and the inner pool (101). Two submersible pumps (6) are arranged between the outer pool (102) and the inner pool (101). The water outlets of the two submersible pumps (6) are located above the inner pool (101). Baffles (7) are fixedly installed between the two adjacent fixing strips (4) on the outer side of the two microfilters (3). The two submersible pumps (6) are adjacent to the corresponding side baffles (7). The baffles (7) on the side away from the submersible pumps (6) have water outlets (8). The sewage pipes of the two microfilters (3) extend to the outer side of the outer pool (102).

2. The integrated recirculating aquaculture tank of claim 1, wherein: The sewage discharge assembly (2) includes a main pipe (201), a secondary pipe (202) and a four-way connector (203). The main pipe (201) is located inside the inner tank (101), and the four-way connector (203) is located on the top of the main pipe (201). There are two secondary pipes (202), and both are connected to the inside of the four-way connector (203). The two secondary pipes (202) are respectively connected to the central water inlet pipes of the two microfilters (3).

3. The integrated recirculating aquaculture tank of claim 1, wherein: Both purification components (5) include a suspended particle collector (501), a first microbial fluidized bed (502), a second microbial fluidized bed (503) and a third microbial fluidized bed (504). The suspended particle collector (501) is located between two baffles (7) and below the microfilter (3). A guide plate (9) is also provided between two adjacent baffles (7). The guide plate (9) is inclined and its bottom is located next to the outlet (8).

4. The integrated recirculating aquaculture tank of claim 3, wherein: Both purification components (5) also include three partitions (505), which separate the first microbial fluidized bed (502), the second microbial fluidized bed (503) and the third microbial fluidized bed (504). The three partitions (505) are fixed by two adjacent fixing strips (4). The bottom of the left and right partitions (505) and the top of the middle partition (505) are provided with flow ports (506).

5. The integrated recirculating aquaculture tank of claim 4, wherein: The baffle (7) forms a pump pool (10) between the side of the submersible pump (6) and the nearest partition (505), and the submersible pump (6) is located inside the pump pool (10).

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