A recirculating aquaculture system for Sudan fish based on multi-stage biological purification

Abstract

This utility model discloses a recirculating aquaculture system for Sudan fish based on multi-stage biological purification, comprising a culture pond, a primary purification system, a secondary purification system, a tertiary purification system, and a quaternary purification system. The outlet of the culture pond is connected to the inlet of the primary purification system. The secondary purification system includes a composite biological filter, the inlet of which is connected to the outlet of the primary purification system. The tertiary purification system includes an ecological purification pond, the inlet of which is connected to the outlet of the secondary purification system. The inlet of the quaternary purification system is connected to the outlet of the tertiary purification system, and the outlet of the quaternary purification system is connected to the inlet of the culture pond. This utility model, through the synergistic effect of the multi-stage purification system, can maximize the purification effect, meet the water quality requirements of Sudan fish, and improve the economic benefits of Sudan fish farming.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture technology, and in particular to a recirculating aquaculture system for Sudan fish based on multi-stage biological purification. Background Technology

[0002] The Sultan fish is a species of fish belonging to the genus *Sultanus* in the family Cyprinidae, order Cypriniformes. Adults reach 50-100 cm in length, with a silvery-brown body and a yellowish-green sheen above the lateral line. Juveniles have black markings on their sides that fade with age. Their pelvic and caudal fins are red, with a black edge on the caudal fin fork. The dorsal fin is colorless with 9 soft rays, and the anal fin has 8. This species is distributed in streams in Thailand, Cambodia, Laos, Malaysia, and Sumatra and Borneo in Indonesia, inhabiting flowing water systems and seasonal floodplains, and exhibits migratory habits. Omnivorous and docile, it is widely farmed as a food fish in Cambodia and Vietnam.

[0003] Land-based circular recirculating aquaculture systems are a highly efficient and intensive aquaculture method. Their land-based facility design eliminates limitations imposed by geography, climate, and season. This system comprises key components such as circular culture ponds, water inlet and drainage systems, aeration systems, and wastewater treatment systems. It features short construction cycles, convenient assembly, high durability, and ease of intelligent management. Furthermore, it ensures controllable water quality and the safety of aquatic products.

[0004] In the process of raising Sudan fish in land-based circular ponds, the water contains excrement, shed tissues, and various suspended solids. Furthermore, due to the use of feed and medications, the wastewater also contains harmful substances such as ammonia nitrogen, nitrite nitrogen, COD, and nitrogen and phosphorus. Therefore, in land-based circular pond recirculating aquaculture systems, the water needs to be purified before reuse. Because Sudan fish have very high water quality requirements, even slight deterioration in water quality can immediately lead to decreased appetite, stress, and even death. Current land-based circular pond wastewater purification technologies are insufficient, resulting in reduced profitability for Sudan fish farming. Utility Model Content

[0005] The purpose of this invention is to provide a recirculating aquaculture system for Sudan fish based on multi-stage biological purification, in order to solve the technical problems mentioned in the background art. To achieve the above objectives, the present invention adopts the following technical solution: A recirculating aquaculture system for Sudan fish based on multi-stage biological purification includes a culture pond, a primary purification system, a secondary purification system, a tertiary purification system, and a quaternary purification system. The outlet of the culture pond is connected to the inlet of the primary purification system. The secondary purification system includes a composite biological filter, the inlet of which is connected to the outlet of the primary purification system. The tertiary purification system includes an ecological purification pond, the inlet of which is connected to the outlet of the secondary purification system. The inlet of the quaternary purification system is connected to the outlet of the tertiary purification system, and the outlet of the quaternary purification system is connected to the inlet of the culture pond.

[0006] Furthermore, the primary purification system is a rotary drum microfiltration machine.

[0007] Furthermore, the composite biological filter includes an anaerobic biological filter and an aerobic biological filter; the anaerobic biological filter includes an anaerobic tank body, partitions, a fixing frame, supports, and anaerobic packing material; the inlet of the anaerobic tank body is located at the bottom and connected to the outlet of the primary purification system, and the outlet is located on the upper part of the side wall and connected to the aerobic biological filter; the partitions are arranged in the anaerobic tank body, with two partitions spaced apart on the left and right, and the two partitions are inclined to form a structure that is narrow at the bottom and wide at the top; the fixing frame is horizontally arranged in the upper part of the anaerobic tank body; multiple supports are provided and vertically distributed on the bottom surface of the fixing frame, and each support is provided with multiple anaerobic packing materials.

[0008] Furthermore, the aerobic biological filter includes an aerobic tank body, a pressure plate, and aerobic packing material; the inlet of the aerobic tank body is located at the bottom and connected to the outlet of the anaerobic tank body, the outlet is located on the upper part of the side wall and connected to the three-stage purification system; the pressure plate is horizontally arranged in the upper part of the aerobic tank body; the aerobic packing material is arranged in the aerobic tank body and located below the pressure plate.

[0009] Furthermore, the aerobic biological filter also includes a first aeration pipe and a first aeration and oxygenation disc; the first aeration pipe is located at the bottom of the aerobic tank; multiple first aeration and oxygenation discs are provided and connected to the first aeration pipe.

[0010] Furthermore, the ecological purification pond includes an ecological pond body, a floating bed, planting pots, connecting ropes, and ecological filler. The inlet of the ecological pond body is located at the bottom of the side wall and is connected to the outlet of the aerobic pond body, with the outlet located at the upper part of the side wall. The floating bed is located inside the ecological pond body. Multiple planting pots are located on the floating bed. Multiple connecting ropes are provided and vertically distributed at the bottom of the floating bed, with multiple ecological fillers on each connecting rope.

[0011] Furthermore, the ecological purification pond also includes a second aeration pipe and a second aeration and oxygenation disc; multiple second aeration and oxygenation discs are provided and connected to the second aeration pipe.

[0012] Furthermore, the aforementioned four-stage purification system is an ultraviolet sterilizer.

[0013] The advantages of this utility model compared to the prior art are as follows: This invention utilizes a four-stage purification system for water circulation in land-based circular pond aquaculture. The first-stage system removes suspended solids from the aquaculture water. The second and third-stage systems employ an upflow design, increasing the contact time between the water and the packing material and enhancing the purification effect. The second-stage system utilizes anaerobic-aerobic biological purification for denitrification and nitrification. The third-stage system uses an ecological floating bed in conjunction with ecological packing material for dual purification. The fourth-stage system kills bacteria and fungi in the water. This multi-stage synergistic effect maximizes the purification efficiency, meets the water quality requirements of Sudan fish, and improves the profitability of Sudan fish farming. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the secondary and tertiary purification systems of this utility model; Figure 3 This is a schematic diagram of the structure of the two-stage purification system of this utility model; Figure 4 This is a schematic diagram of the three-stage purification system of this utility model; In the attached diagram, 1-Aquaculture pond; 2-Level 1 purification system; 3- Secondary purification system; 31-Anaerobic biological filter; 311-Anaerobic tank body; 312-Baffle; 313-Fixing frame; 314-Support; 315-Anaerobic packing material; 32-Aerobic biological filter; 321-Aerobic tank body; 322-Pressure plate; 323-Aerobic packing material; 324-First aeration pipe; 325-First aeration and oxygenation disc; 4- Three-stage purification system; 41-Ecological purification pond; 411-Ecological pond body; 412-Floating bed; 413-Planting pot; 414-Connecting rope; 415-Ecological filler; 416-Second aeration pipe; 417-Second aeration and oxygenation disc; 5. Four-stage purification system. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0016] like Figure 1-4 As shown, a recirculating aquaculture system for Sudan fish based on multi-stage biological purification includes a culture pond 1, a primary purification system 2, a secondary purification system 3, a tertiary purification system 4, and a quaternary purification system 5. The outlet of the culture pond 1 is connected to the inlet of the primary purification system 2. The secondary purification system 3 includes a composite biological filter, the inlet of which is connected to the outlet of the primary purification system 2. The tertiary purification system 4 includes an ecological purification pond 41, the inlet of which is connected to the outlet of the secondary purification system 3. The inlet of the quaternary purification system 5 is connected to the outlet of the tertiary purification system 4, and the outlet of the quaternary purification system 5 is connected to the inlet of the culture pond 1.

[0017] The primary purification system 2 is a rotary drum microfilter; the rotary drum microfilter can remove most of the large solid particles in the water, including fish feces, uneaten food, etc.

[0018] The composite biological filter includes an anaerobic biological filter 31 and an aerobic biological filter 32. The anaerobic biological filter 31 includes an anaerobic tank body 311, a partition 312, a fixing frame 313, a support 314, and anaerobic packing material 315. The inlet of the anaerobic tank body 311 is located at the bottom and is connected to the outlet of the primary purification system 2. The outlet is located on the upper part of the side wall and is connected to the aerobic biological filter 32. The partition 312 is located inside the anaerobic tank body 311, with two partitions spaced apart on the left and right sides. The two partitions 312 are inclined to form a structure that is narrow at the bottom and wide at the top. The fixing frame 313 is horizontally located in the upper part of the anaerobic tank body 311. Multiple supports 314 are provided and vertically distributed on the bottom surface of the fixing frame 313. Each support 314 is provided with multiple anaerobic packing materials 315. Denitrifying bacteria are provided on the anaerobic packing materials 315. Water enters the anaerobic tank 311 from the bottom inlet, forming an upflow, and comes into contact with the anaerobic packing 315 for denitrification. The baffle 312 makes the anaerobic tank 311 narrow at the bottom and wide at the top, which can regulate the water flow rate, making the water flow rate slow down. The faster flow rate at the bottom prevents blockage, while the slower flow rate at the top increases the hydraulic retention time, ensuring that the denitrification reaction is fully carried out.

[0019] The aerobic biological filter 32 includes an aerobic tank body 321, a pressure plate 322, and aerobic packing material 323. The inlet of the aerobic tank body 321 is located at the bottom and connected to the outlet of the anaerobic tank body 311. The outlet is located on the upper part of the side wall and connected to the three-stage purification system 4. The pressure plate 322 is horizontally positioned in the upper part of the aerobic tank body 321. The aerobic packing material 323 is located inside the aerobic tank body 321, below the pressure plate 322. Nitrifying bacteria are present on the aerobic packing material 323. Water enters the aerobic tank body 321 from the bottom inlet, forming an upflow, and comes into contact with the aerobic packing material 323 for nitrification.

[0020] The aerobic biological filter 32 further includes a first aeration pipe 324 and a first aeration and oxygenation disc 325. The first aeration pipe 324 is located at the bottom of the aerobic tank 321 and is externally connected to an air supply device, such as an air pump. Multiple first aeration and oxygenation discs 325 are provided and connected to the first aeration pipe 324. The first aeration pipe 324 and the first aeration and oxygenation discs 325 are used to aerate the aerobic tank, ensuring the dissolved oxygen level in the aerobic tank 321.

[0021] The ecological purification pond 41 includes an ecological pond body 411, a floating bed 412, planting pots 413, connecting ropes 414, and ecological filler 415. The inlet of the ecological pond body 411 is located at the bottom of the side wall and is connected to the outlet of the aerobic pond body 321, with the outlet located at the upper part of the side wall. The floating bed 412 is located inside the ecological pond body 411. Multiple planting pots 413 are placed on the floating bed 412. Multiple connecting ropes 414 are vertically distributed at the bottom of the floating bed 412, and each connecting rope 414 has multiple ecological filler 415s. The ecological filler 415 is a biological rope. Water enters the ecological pond body 411 from the bottom inlet, forming an upflow, and comes into contact with the ecological filler 415. At the same time, aquatic vegetables or plants such as water spinach and water celery are planted in the planting pots 413 to remove nutrients. The ecological filler 415 can enhance the biofilm effect that originally only occurred through the root system, forming a dual purification process.

[0022] The ecological purification pond 41 further includes a second aeration pipe 416 and a second aeration and oxygenation disc 417. The second aeration pipe 416 is located at the bottom of the ecological pond 411 and is externally connected to an air supply device, such as an air pump. Multiple second aeration and oxygenation discs 417 are provided and connected to the second aeration pipe 416. The second aeration pipe 416 and the second aeration and oxygenation discs 417 are used to aerate the ecological pond to ensure the dissolved oxygen level in the ecological pond 411.

[0023] The aforementioned four-stage purification system 5 is an ultraviolet sterilizer. The ultraviolet sterilizer is used to kill potential pathogens such as bacteria, viruses, and parasites in the water.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A recirculating aquaculture system for Sudan fish based on multi-stage biological purification, characterized in that: The system includes a breeding pond, a primary purification system, a secondary purification system, a tertiary purification system, and a quaternary purification system. The outlet of the breeding pond is connected to the inlet of the primary purification system. The secondary purification system includes a composite biological filter, the inlet of which is connected to the outlet of the primary purification system. The tertiary purification system includes an ecological purification pond, the inlet of which is connected to the outlet of the secondary purification system. The inlet of the quaternary purification system is connected to the outlet of the tertiary purification system, and the outlet of the quaternary purification system is connected to the inlet of the breeding pond.

2. The Sudan fish recirculating aquaculture system based on multi-stage biological purification according to claim 1, characterized in that: The primary purification system is a rotary drum microfiltration machine.

3. The Sudan fish recirculating aquaculture system based on multi-stage biological purification according to claim 1, characterized in that: The composite biological filter includes an anaerobic biological filter and an aerobic biological filter. The anaerobic biological filter includes an anaerobic tank body, partitions, a fixing frame, supports, and anaerobic packing material. The inlet of the anaerobic tank body is located at the bottom and connected to the outlet of the primary purification system. The outlet is located on the upper part of the side wall and connected to the aerobic biological filter. The partitions are located inside the anaerobic tank body, with two partitions spaced apart on the left and right sides. The two partitions are inclined to form a structure that is narrower at the bottom and wider at the top. The fixing frame is horizontally located in the upper part of the anaerobic tank body. Multiple supports are provided and vertically distributed on the bottom surface of the fixing frame. Each support is provided with multiple anaerobic packing materials.

4. The Sudan fish recirculating aquaculture system based on multi-stage biological purification according to claim 3, characterized in that: The aerobic biological filter includes an aerobic tank body, a pressure plate, and aerobic packing material; the inlet of the aerobic tank body is located at the bottom and connected to the outlet of the anaerobic tank body, and the outlet is located on the upper part of the side wall and connected to the three-stage purification system; the pressure plate is horizontally installed in the upper part of the aerobic tank body; the aerobic packing material is installed in the aerobic tank body and located below the pressure plate.

5. A Sudan fish recirculating aquaculture system based on multi-stage biological purification as described in claim 4, characterized in that: The aerobic biological filter also includes a first aeration pipe and a first aeration and oxygenation disc; the first aeration pipe is located at the bottom of the aerobic tank; multiple first aeration and oxygenation discs are provided and connected to the first aeration pipe.

6. A recirculating aquaculture system for Sudan fish based on multi-stage biological purification as described in claim 5, characterized in that: The ecological purification pond includes an ecological pond body, a floating bed, planting pots, connecting ropes, and ecological filler. The water inlet of the ecological pond body is located at the bottom of the side wall and is connected to the water outlet of the aerobic pond body, which is located at the top of the side wall. The floating bed is located inside the ecological pond body. Multiple planting pots are placed on the floating bed. Multiple connecting ropes are provided and vertically distributed at the bottom of the floating bed, and multiple ecological fillers are provided on each connecting rope.

7. The Sudan fish recirculating aquaculture system based on multi-stage biological purification according to claim 1, characterized in that: The ecological purification pond also includes a second aeration pipe and a second aeration and oxygenation disc; the second aeration pipe is located at the bottom of the ecological pond; multiple second aeration and oxygenation discs are provided and connected to the second aeration pipe.

8. A recirculating aquaculture system for Sudan fish based on multi-stage biological purification as described in claim 1, characterized in that: The aforementioned four-stage purification system is an ultraviolet sterilizer.

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