Circulating aquaculture system

Abstract

The utility model belongs to the technical field of aquaculture, and particularly provides a recirculating aquaculture system which comprises an aquaculture pond, a circulating unit and a tail water treatment unit. The circulating unit comprises a filter tank, a disinfection device and a first biological tank which are communicated in sequence; the culture pond is respectively communicated with the filter pond and the first biological pond through pipelines; a dosing device is arranged on a connecting pipeline between the first biological tank and the culture tank; the filter tank, the first biological tank and the culture tank are respectively connected with the tail water treatment unit through blow-off pipelines. The recirculating aquaculture system is simple in structure and easy to manage, used aquaculture water is recycled after being physically and biologically filtered by the circulating unit, water resources are saved, and wastewater discharge is reduced. The medicine adding device can add medicine according to the growth requirements of cultured aquatic products, healthy growth of the aquatic products is promoted, and the quality of the aquatic products is improved. Waste water generated in the working process is purified by the tail water treatment unit and can be conveyed into the culture pond again for aquaculture, waste water discharge is avoided, and green culture is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture technology, specifically relating to a recirculating aquaculture system. Background Technology

[0002] With increasingly stringent requirements for the quality and safety of aquatic products, traditional aquaculture methods face numerous challenges, such as water pollution, frequent disease outbreaks, and drug residues. These issues also cause severe environmental damage and pollution, hindering the efficient use of resources and the sustainable development of the aquaculture industry. To address these problems, the factory-style recirculating aquaculture system (RAS) has emerged. However, existing RAS systems still have some shortcomings, such as difficulty in water quality control, high aquaculture costs, and challenges in treating wastewater, making it difficult to achieve truly green aquaculture. Utility Model Content

[0003] The purpose of this invention is to provide a highly efficient, environmentally friendly, and sustainable factory-scale recirculating aquaculture system.

[0004] Therefore, this utility model provides a recirculating aquaculture system, including an aquaculture pond, a circulation unit, and a wastewater treatment unit; the circulation unit includes a filter pond, a disinfection device, and a first biological pond connected in sequence; the aquaculture pond is connected to the filter pond and the first biological pond respectively through pipes; a dosing device is provided on the connecting pipe between the first biological pond and the aquaculture pond; the filter pond, the first biological pond, and the aquaculture pond are connected to the wastewater treatment unit respectively through sewage discharge pipes.

[0005] Specifically, the aforementioned wastewater treatment unit includes a wastewater pretreatment module, a wastewater biological treatment module, and a second clear water tank connected in sequence; the wastewater pretreatment module is used to recover and pretreat the system wastewater; the wastewater biological treatment module is used to biologically purify the pretreated wastewater; the filter tank, the first biological tank, and the aquaculture tank are connected to the wastewater pretreatment module through sewage pipes.

[0006] Specifically, the aforementioned filtration tank is equipped with a microfilter for purifying the water output from the aquaculture tank.

[0007] Specifically, a vertical flow separator is installed on the pipeline between the aquaculture pond and the filtration pond; the wastewater outlet of the vertical flow separator is connected to the tailwater treatment unit.

[0008] Specifically, the aforementioned recirculating aquaculture system also includes a protein separator; the inlet end of the protein separator is connected to a disinfection device, and the outlet end is connected to the first biological tank.

[0009] Specifically, the aforementioned recirculating aquaculture system also includes an oxygenation device; the oxygenation device is connected between the first biological tank and the aquaculture tank via a pipeline.

[0010] Specifically, the aforementioned oxygenation device includes an oxygen cone, an oxygen cone pump, and an oxygen generator; the oxygen cone and the oxygen cone pump are connected between the first biological tank and the aquaculture tank; the oxygen generator is connected to the oxygen cone.

[0011] Specifically, the aforementioned aquaculture ponds are equipped with water quality monitoring instruments.

[0012] Specifically, the aforementioned recirculating aquaculture system also includes a source water treatment unit for adjusting the quality of the source water; the source water unit is connected to the filter tank and the aquaculture tank respectively through pipelines.

[0013] Specifically, the aforementioned source water treatment unit includes a raw water tank and an acid-base adjustment device; the acid-base adjustment device is connected to the raw water tank; the raw water tank is connected to a filtration tank and an aquaculture tank via pipelines.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] The recirculating aquaculture system provided by this invention is simple in structure and easy to manage. The aquaculture water used in the aquaculture ponds is recycled through physical and biological filtration by the circulation unit, significantly reducing water consumption and wastewater discharge, thus being environmentally friendly. The dosing device can add medication according to the growth needs of the aquatic products, promoting healthy growth and improving the quality and safety of aquatic products. Simultaneously, wastewater generated during the operation of the aquaculture ponds and the first biological pond is purified by the tailwater treatment unit, achieving wastewater treatment and allowing it to be reintroduced into the aquaculture ponds for aquaculture, avoiding wastewater discharge and achieving green aquaculture. This system is suitable for large-scale promotion and application, contributing to the transformation, upgrading, and sustainable development of the aquaculture industry.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the recirculating aquaculture system provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the wastewater treatment unit of the recirculating aquaculture system provided by this utility model.

[0019] Explanation of reference numerals in the attached diagrams: 1. Aquaculture pond; 2. Vertical flow separator; 3. Filtration tank; 4. Microfilter; 5. Temperature control device; 6. Disinfection device; 7. Circulating water pump; 8. Protein skimmer; 9. Ozone generator; 10. Decarbonizer; 11. Low-noise fan; 12. First biological tank; 13. First clear water tank; 14. Dosing device; 15. Water quality monitor; 16. Oxygen cone pump; 17. Oxygen cone; 18. Oxygen generator; 19. Wastewater treatment unit; 191. Wastewater pretreatment module; 1911. Wastewater collection well; 1912. Bar screen well; 1913. Adjustment... 192. Wastewater biological treatment module; 1921. Sedimentation tank; 1922. Air flotation tank; 1923. Acidification tank; 1924. Denitrification tank; 1925. Contact oxidation tank; 1926. Secondary sedimentation tank; 1927. Second biological treatment tank; 1928. High-speed blower; 193. Second clear water tank; 194. Recycling module; 1941. Activated carbon tank; 1942. Ultrafiltration tank; 1943. MBR membrane tank; 1944. Reuse tank; 195. Sludge tank; 196. Sludge dewatering machine; 20. Raw water treatment unit; 21. PLC controller. Detailed Implementation

[0020] 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 scope of protection of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Reference Figure 1This invention provides a recirculating aquaculture system, including an aquaculture pond 1, a circulation unit, and a wastewater treatment unit 19. The circulation unit includes a filter pond 3, a disinfection device 6, and a first biological pond 12 connected in sequence. The aquaculture pond 1 is connected to the filter pond 3 and the first biological pond 12 via pipes. A dosing device 14 is installed on the connecting pipe between the first biological pond 12 and the aquaculture pond 1. The filter pond 3, the first biological pond 12, and the aquaculture pond 1 are connected to the wastewater treatment unit 19 via sewage pipes. After use, the aquaculture water in the aquaculture pond 1 enters the filter pond 3 through the inlet, where it filters out solid particulate impurities such as feces and uneaten feed. The filtrate enters the disinfection device 6 for disinfection, sterilizing the recirculating water and preventing the growth and spread of pathogens. The disinfected liquid flows into the first biological pond 12, where biological filter media, such as bio-balls and biofilms, convert harmful substances such as ammonia nitrogen and nitrite in the water into harmless substances, completing the biological purification of the aquaculture water. The purified water is then returned to the aquaculture pond 1 for reuse. The dosing device 14 is preferably a dosing pump, which administers appropriate medications according to the health status and growth needs of the aquatic organisms, allowing them to enter the aquaculture pond 1 along with the purified water. Wastewater generated during the operation of the aquaculture pond 1, filter pond 3, and first biological pond 12 is sent to the wastewater treatment unit 19 for purification via their respective drainage pipes. The purified water outlet of the wastewater treatment unit 19 can be connected to the aquaculture pond 1, allowing the purified water to be returned to the aquaculture pond 1 for aquaculture. The bottom of the aquaculture pond 1 is preferably equipped with a drain outlet to facilitate the periodic discharge of waste such as feces and uneaten feed to the wastewater treatment unit 19 for treatment. The disinfection device 6 is preferably an ultraviolet sterilizer.

[0023] Furthermore, refer to Figure 2 The wastewater treatment unit 19 includes a wastewater pretreatment module 191, a wastewater biological treatment module 192, and a second clear water tank 193 connected in sequence. The wastewater pretreatment module 191 is used to recover and pretreat the system wastewater. The wastewater biological treatment module 192 is used to biologically purify the pretreated wastewater. The filter tank 3, the first biological tank 12, and the aquaculture tank 1 are connected to the wastewater pretreatment module 191 through sewage pipes to supply wastewater to it. After the wastewater is pretreated by the wastewater pretreatment module 191, it is sent to the wastewater biological treatment module 192 for further purification, and then sent to the second clear water tank 193. After passing the test, it can be returned to the aquaculture tank 1 or other sites with demand for reuse.

[0024] Optionally, the effluent pretreatment module 191 includes an effluent collection well 1911, a bar screen well 1912, and a regulating tank 1913 arranged sequentially. The effluent discharged from the sewage pipes of each device is uniformly collected in the effluent collection well 1911, then sent to the bar screen well 1912 for sedimentation. The clarified liquid flows into the regulating tank 1913 for further treatment before flowing into the effluent biological treatment module 192 for biological purification.

[0025] Specifically, the effluent biological treatment module 192 includes a sedimentation tank 1921, a flotation tank 1922, an acidification tank 1923, a denitrification tank 1924, a contact oxidation tank 1925, a secondary sedimentation tank 1926, and a second biological tank 1927 connected in sequence. The purified water outlet of the second biological tank 1927 is connected to the second clear water tank 193. The effluent treated by the effluent pretreatment module 191 is pumped into the sedimentation tank 1921 for sedimentation. The supernatant is returned to the flotation tank 1922 through a pipeline to remove suspended solids, colloids, and most of the organic matter in the wastewater before flowing into the acidification tank 1923, the denitrification tank 1924, the contact oxidation tank 1925, the secondary sedimentation tank 1926, and the second biological tank 1927 for corresponding purification treatment in sequence.

[0026] Preferably, a high-speed blower 1928 can be used to supply oxygen to the dissolved air flotation tank 1922, the contact oxidation tank 1925, and the second biological tank 1927 to ensure the degradation effect. The sediment produced in the secondary sedimentation tank 1926 can be periodically sent to the sludge tank 195 for cleaning, the supernatant is returned to the sedimentation tank 1921, and the sludge is dewatered by the sludge dewatering machine 196 and then transported to a designated location for harmless treatment.

[0027] The sedimentation tank 1921, flotation tank 1922, acidification tank 1923, denitrification tank 1924, contact oxidation tank 1925, secondary sedimentation tank 1926, and second biological tank 1927 in the tailwater biological treatment module 192 can be reduced or adjusted according to actual needs.

[0028] To improve the purification effect of the wastewater treatment unit 19, a recycling module 194 can also be set up, which is connected to the second clear water tank 193, to further treat the recycled water.

[0029] Specifically, the recycling module 194 includes an activated carbon tank 1941, an ultrafiltration tank 1942, an MBR membrane tank 1943, and a reuse tank 1944 connected in sequence. The activated carbon tank 1941 is connected to the second clear water tank 193, where the recycled water is adsorbed and purified before being sent to the ultrafiltration tank 1942 to remove suspended particles, colloids, viruses, algae, and other micro-pollutants from the wastewater. Then, it enters the MBR membrane tank 1943, where the membrane's high-efficiency separation completely separates solids and liquids, removing suspended solids, colloids, bacteria, some viruses, and large organic molecules, ensuring extremely low suspended solids content, low turbidity, and clear and stable water quality in the treated effluent. The treated water enters the reuse tank 1944, and after passing testing, it can be returned to the aquaculture tank 1 or other sites with demand for reuse.

[0030] The activated carbon tank 1941, ultrafiltration tank 1942, MBR membrane tank 1943, and reuse tank 1944 in the recovery module 194 can be reduced or adjusted according to actual needs.

[0031] In a more detailed implementation, the filter tank 3 is equipped with a microfilter 4 to remove suspended particles, microorganisms and colloidal substances from the water for preliminary purification.

[0032] Furthermore, the recirculating aquaculture system also includes a temperature control device 5, which is connected to the filter tank 3. This device controls the temperature of the aquaculture water according to the external temperature, thereby improving the survival rate of the aquatic organisms. The temperature control device 5 can be a thermostat or a fuel boiler.

[0033] To improve the physical filtration effect, a vertical flow separator 2 is installed on the pipe between the aquaculture pond 1 and the filter pond 3; the wastewater outlet of the vertical flow separator 2 is connected to the tailwater treatment unit 19. The aquaculture water undergoes natural sedimentation through the vertical flow separator 2, initially removing suspended solids and particulate matter. It is then further purified by a microfilter 4 to improve the purification effect of the aquaculture water.

[0034] Furthermore, the recirculating aquaculture system also includes a protein separator 8; the inlet of the protein separator 8 is connected to a disinfection device 6, and the outlet is connected to a first biological tank 12. To ensure smooth water flow, a circulating water pump 7 is installed on the pipe connecting the disinfection device 6 and the protein separator 8, and the circulating water pump 7 is connected to the first biological tank 12 via a pipe. The circulating water pump 7 directly delivers a portion of the disinfected aquaculture water to the first biological tank 12, and the other portion is delivered to the biological tank 12 after passing through the protein separator 8, so as to flexibly control the protein content in the aquaculture water. Preferably, it also includes an ozone generator 9, which is connected to the protein separator 8 to provide ozone.

[0035] Optionally, a decarbonizer 10 is provided between the connecting pipe of the protein separator 8 and the first biological tank 12, and the pH of the aquaculture water is adjusted by the decarbonizer 10.

[0036] Furthermore, the circulation system also includes a low-noise fan 11, which provides airflow to the first biological tank 12 and the decarbonizer 10 to agitate the aquaculture water in each, thereby improving efficiency.

[0037] In an optimized embodiment, the recirculating aquaculture system further includes an oxygenation device; the oxygenation device is connected between the first biological tank 12 and the aquaculture tank 1 via a pipeline to provide sufficient oxygen to the aquaculture water to meet the respiratory needs of the cultured organisms.

[0038] Specifically, the oxygenation device includes an oxygen cone 17, an oxygen cone pump 16, and an oxygen generator 18; the oxygen cone 17 and the oxygen cone pump 16 are sequentially connected between the first biological pond 12 and the aquaculture pond 1; the oxygen generator 18 is connected to the oxygen cone 17 to provide oxygen.

[0039] Furthermore, the aquaculture pond 1 is equipped with a water quality monitoring instrument 15. The water quality monitoring instrument 15 uses water sensors to monitor parameters such as temperature, pH, dissolved oxygen, ammonia nitrogen, and nitrite in the aquaculture water in real time, as needed. Based on the monitoring results, it automatically adjusts the corresponding equipment in the recirculating aquaculture system to ensure that the water quality remains stable within a suitable range.

[0040] In a more detailed embodiment, the recirculating aquaculture system further includes a source water treatment unit 20 for adjusting the quality of the source water; the source water unit is connected to the filter tank 3 and the aquaculture tank 1 via pipelines. The treated source water is replenished to the filter tank 3 or the aquaculture tank 1 as needed. The purified water outlet of the wastewater treatment unit 19 can be connected to the source water treatment unit 20 for recycling and reuse of the treated wastewater.

[0041] Specifically, the raw water treatment unit 20 includes a raw water tank and an acid-base adjustment device; the acid-base adjustment device is connected to the raw water tank; the raw water tank is connected to the filter tank 3 and the aquaculture tank 1 respectively through pipelines. The raw water tank is used to hold the raw water, and the acid-base adjustment device adjusts its acidity and alkalinity according to the quality of the raw water to meet the standards before sending it to the subsequent filter tank 3 or aquaculture tank 1 for use.

[0042] Optionally, the purified water outlet of the first biological tank 12 is connected to a first clear water tank 13. The aquaculture water purified by the first biological tank 12 enters the first clear water tank 13, while the effluent enters the effluent treatment unit 19 for treatment through a sewage pipe. The source water treatment unit 20 is connected to the aquaculture tank 1 via the first clear water tank 13.

[0043] To better control water stability, the recirculating aquaculture system also includes a control device that connects to all electrical equipment within the system, such as the dosing device 14, microfilter 4, ultraviolet sterilizer, circulating water pump 7, protein separator 8, ozone generator 9, oxygen generator 18, oxygen cone pump 16, water quality monitor 15, various fans, and temperature control units. The control device is selected from existing equipment based on actual conditions, with PLC controller 21 being the preferred choice. The PLC enables fast, accurate, and intelligent control.

[0044] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A recirculating aquaculture system, characterized in that: It includes an aquaculture pond (1), a circulation unit and a wastewater treatment unit (19); the circulation unit includes a filter pond (3), a disinfection device (6) and a first biological pond (12) connected in sequence; the aquaculture pond (1) is connected to the filter pond (3) and the first biological pond (12) respectively through pipes; a dosing device (14) is provided on the connecting pipe between the first biological pond (12) and the aquaculture pond (1); the filter pond (3), the first biological pond (12) and the aquaculture pond (1) are connected to the wastewater treatment unit (19) respectively through sewage pipes.

2. The recirculating aquaculture system as described in claim 1, characterized in that: The wastewater treatment unit (19) includes a wastewater pretreatment module (191), a wastewater biological treatment module (192), and a second clear water tank (193) connected in sequence; the filter tank (3), the first biological tank (12), and the aquaculture tank (1) are connected to the wastewater pretreatment module (191) through sewage pipes.

3. The recirculating aquaculture system as described in claim 1, characterized in that: The filter tank (3) is equipped with a microfilter (4).

4. The recirculating aquaculture system as described in claim 1, characterized in that: A vertical flow separator (2) is installed on the pipe between the aquaculture pond (1) and the filter pond (3); the wastewater outlet of the vertical flow separator (2) is connected to the tailwater treatment unit (19).

5. The recirculating aquaculture system as described in claim 1, characterized in that: It also includes a protein separator (8); the inlet end of the protein separator (8) is connected to a disinfection device (6), and the outlet end is connected to a first biological pool (12).

6. The recirculating aquaculture system as described in claim 1, characterized in that: It also includes an oxygenation device; the oxygenation device is connected between the first biological pond (12) and the aquaculture pond (1) via a pipeline.

7. The recirculating aquaculture system as described in claim 6, characterized in that: The oxygenation device includes an oxygen cone (17), an oxygen cone pump (16), and an oxygen generator (18); the oxygen cone (17) and the oxygen cone pump (16) are connected between the first biological pond (12) and the aquaculture pond (1); the oxygen generator (18) is connected to the oxygen cone (17).

8. The recirculating aquaculture system as described in claim 1, characterized in that: The aquaculture pond (1) is equipped with a water quality monitoring instrument (15).

9. The recirculating aquaculture system as described in claim 1, characterized in that: It also includes a source water treatment unit (20) for adjusting the quality of the source water; the source water unit is connected to the filter pool (3) and the aquaculture pool (1) respectively through pipelines.

10. The recirculating aquaculture system as described in claim 9, characterized in that: The source water treatment unit (20) includes a raw water tank and an acid-base adjustment device; the acid-base adjustment device is connected to the raw water tank; the raw water tank is connected to the filter tank (3) and the aquaculture tank (1) respectively through pipelines.

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