CN111226701A - Energy-saving pond recirculating aquaculture method - Google Patents

Abstract

The invention discloses an energy-saving pond recirculating aquaculture method, which comprises the following steps: step 1, throwing omnivorous fishes, crabs and filter feeding varieties into a purification culture area, planting waterweeds into a plant purification area, and throwing shrimps into a culture area with a high water change rate; step 2, controlling the liquid level of the sewage suction well by a sewage suction pump to be lower than the liquid level of the culture ponds, naturally pressing the sewage of each culture pond into the sewage suction well through a sewage discharge port by the pressure generated by liquid level difference, and then discharging the sewage into a purified culture area through a sewage discharge pipe; and 3, introducing the water purified in the purified culture area and the plant purification area into a disinfection area for disinfection, allowing the disinfected water to flow into an annular water inlet distribution well, and finally uniformly distributing the water to each culture pond from a water inlet. The invention has low cost and energy consumption and good controllability.

Description

Energy-saving pond circulating aquaculture method

technical field

The invention relates to the technical field of culture, in particular to an energy-saving pond circulating water culture method.

Background technique

There are mainly two modes of shrimp farming: factory farming and pond farming. Factory farming is mainly based on workshop shrimp pond farming, which requires large investment, good controllability of farming environment and high success rate. The controllability of pond farming is not as good as that of factory farming, but due to the small investment and low technical threshold, it is the current mainstream farming method.

Pond culture can be divided into soil pond culture and high-level pond culture according to different conditions of inflow and drainage. Among them, extensive culture and intensive culture are a single species of culture, and polyculture includes fish and shrimp polyculture, shrimp, crab, shellfish and other methods. The pond culture system is usually designed for water supply and drainage according to natural conditions, and adopts the method of large discharge and large discharge, and cannot comprehensively utilize the aquaculture tail water, residual bait and manure. Some facility aquaculture systems adopting integrated multi-trophic aquaculture (IMTA, Integrated Multi-trophic Aquaculture), due to the large number of functional modules in the system, the use of a large number of pumps, high energy consumption, and complex control, which are not conducive to reducing costs and costs. Production management.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides an energy-saving pond circulating water culture method. Through the clever layout and the design of the liquid level difference in the functional area, at least one sewage suction pump can realize the water circulation of the system, reduce the cost and energy consumption, The system control is simple; by rationally dividing the functional areas, the cultured species that need high water exchange rate and high protein feed are separated from the common species, which is beneficial to reduce the production interference between different cultured species, reduce the cost of breeding, and improve the utilization rate of residual bait and excrement. , to improve water quality and increase the utilization rate of water recycling. Through the optimization of hydraulic retention time in different functional areas, the production capacity of aquaculture space can be fully utilized, and the roles of animals, plants and microorganisms in the utilization of residual bait and manure and water purification can be brought into play.

The present invention adopts following technical scheme to realize above-mentioned purpose:

An energy-saving pond recirculating aquaculture method, applied to a pond recirculating aquaculture system, the pond recirculating aquaculture system comprises a purification culture area, a plant purification area, a disinfection area and a high water exchange rate culture area, which are connected in sequence, and the high exchange rate culture area. The aquaculture area is spatially separated from other areas by physical materials;

The high water exchange rate breeding area includes at least two breeding ponds, and the bottom of each breeding pond is respectively provided with a sewage outlet; the high water exchange rate breeding area also includes a sewage collection part and a water inlet distribution part, and the sewage collection part is provided with a sewage pipe and The sewage suction pump is connected to the sewage pipe, the sewage pipe is respectively connected to the sewage outlet and the purification breeding area through the sewage suction pump, and the water inlet distribution part is respectively connected to the breeding pond and the disinfection area;

The energy-saving pond circulating aquaculture method comprises the following steps:

Step 1, put omnivorous fish, crabs and filter-feeding species in the purification aquaculture area, plant aquatic plants in the plant purification area, and put shrimps in the high water exchange rate aquaculture area;

Step 2: Control the liquid level of the sewage collection part through the sewage suction pump to make it lower than the liquid level of the culture pond. The sewage of each culture pond is naturally pressed into the sewage collection part through the sewage outlet by the pressure generated by the liquid level difference, and then passes through the sewage outlet. The sewage pipe is discharged into the purification breeding area;

In step 3, the purified water in the purification breeding area and the plant purification area is passed to the disinfection area for disinfection, and the disinfected water flows to the water inlet distribution part, and finally is evenly distributed to each culture pool.

Preferably, the culturing pond is arranged around the sewage collection part, and the sewage collection part further includes a sewage suction well and a sewage suction pipe, and the sewage suction pipe is respectively connected to the sewage suction well and the sewage outlet; the water inlet distribution part includes an annular water inlet arranged around the sewage suction well Distributing wells and water inlet pipes, the annular water inlet distribution wells are respectively connected to each breeding pool, and the water inlet pipes are respectively connected to the annular water inlet distribution wells and the disinfection area.

Preferably, the culture ponds are arranged side by side, and the sewage collection part and the water inflow distribution part are respectively arranged on both sides of the high water exchange rate culture area; The sewage collecting main pipe and sewage collecting tank on the side of the area, each sewage outlet is respectively connected to the sewage collecting main pipe through the branch sewage pipe, and the sewage collecting main pipe is also connected to the sewage collecting tank; the water inlet distribution part includes the water inlet main pipe and the water inlet branch pipe, and the water inlet main pipe One end is connected to the disinfection area, and the other end is connected to each culture pond through the water inlet branch pipe.

Preferably, frequency conversion is used to control the flow rate of the sewage suction pump and the liquid level of the sewage suction well, and each breeding pond maintains the same liquid level because the sewage outlet is connected to the sewage collecting part; the diameter of the sewage suction pipe or the branch sewage pipe is kept different. 10%; the length of the sewage suction pipe or branch sewage pipe should keep a difference of ≤ 10%.

Preferably, the disinfection area includes a water storage channel disposed between the plant purification area and the high water exchange rate culture area, and an ultraviolet sterilizer disposed in the water storage channel, and the water storage channel is provided with a water inlet that communicates with the plant purification area.

Preferably, in step 1, the filter-feeding species are one or more of silver carp, shellfish and snails; aquatic plants are submerged plants.

Preferably, in step 1, the water volume ratio of the purified aquaculture area and the high water exchange rate aquaculture area is ≧2.

Preferably, in step 3, the hydraulic retention time in the disinfection zone is at least 1 minute.

Preferably, in step 3, the hydraulic retention time of the water flow discharged from the sewage collection part in the plant purification area is ≧3 hours.

Preferably, in steps 1-3, according to the water body of the culture pond, the daily water exchange rate of the high water exchange rate aquaculture area and the purified aquaculture area is ≧15%.

The beneficial effects of the present invention are:

1. The energy-saving pond circulating aquaculture method of the present invention has low energy consumption. Due to the ingenious design of water balance, the water circulation problem of the system can be solved only by a sewage suction pump, and the system energy saving effect is obvious.

2. The high water exchange rate aquaculture area is separated from the purified aquaculture area by a separate aquaculture area, which is not disturbed by fish and crabs, and can be fed with high-priced high-protein feed separately, so as not to be eaten by fish. And, because it is separated from aquatic plants, it is easy to capture.

3. There is a UV sterilizer in the water storage channel, which adopts the channel-type UV disinfection method. The equipment is simple and efficient.

4. The plant purification area is set at the front end of the ultraviolet sterilizer, which can filter out the particles in the water and improve the disinfection effect of the ultraviolet lamp.

Description of drawings

1 is a schematic structural diagram of an energy-saving pond circulating aquaculture system provided in Embodiment 1 of the present invention;

Fig. 2 is the water circulation flow chart of the energy-saving pond circulating aquaculture method provided in the embodiment of the present invention;

3 is a schematic structural diagram of an energy-saving pond circulating aquaculture system provided in Embodiment 2 of the present invention.

In the figure, 1-purified breeding area, 2-plant purification area, 3-high water exchange rate breeding area, 4-disinfection area, 5-culture pond, 6-sewage outlet, 7-sewage collecting part, 71-sewage suction well , 72- sewage suction pipe, 73- branch sewage pipe, 74- sewage collection main pipe, 75- sewage collection tank, 8- water inlet distribution part, 81- annular water inlet distribution well, 82- water inlet pipe, 83- water inlet main pipe , 84-water inlet branch pipe, 9-suction pump, 10-sewage pipe, 11-water storage channel, 12-ultraviolet sterilizer, 13-water inlet, 14-water outlet.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings 1-3 and specific embodiments.

Example 1

Please refer to FIG. 1 and FIG. 2 at the same time, an embodiment of the present invention provides an energy-saving pond recirculating aquaculture method, which is applied to a pond recirculating aquaculture system. The pond recirculating aquaculture system includes a purification culture area 1, a plant Purification area 2, disinfection area 4 and high water exchange rate culture area 3. The high water exchange rate culture area 3 is spatially separated from other areas by using physical materials.

Among them, the high water exchange rate culture area 3 includes four culture pools 5, and each culture pool 5 is isolated from the purification culture area 1 and the plant purification area 2 respectively. The bottom of each culture pond 5 is respectively provided with a sewage outlet 6 . The high water exchange rate culture area 3 also includes a sewage collection part 7 and a water inlet distribution part 8. The sewage collection part 7 is provided with a sewage discharge pipe 10 and a sewage suction pump 9 connected to the sewage discharge pipe 10, and the sewage discharge pipe 10 is respectively connected through the sewage suction pump 9. Sewage outlet 6 and purification breeding area 1. The water inlet distribution part 8 is connected to the culture pond 5 and the disinfection area 4 respectively.

When the energy-saving pond circulating aquaculture system of the present invention is in use, the purifying aquaculture area 1 is used for feeding omnivorous fish, crabs and filter-feeding species, the plant purification area 2 is used for planting aquatic plants, and the cultivating pond 5 is used for feeding shrimps kind. Residual bait and feces of the shrimp discharged from the culture tank 5 are collected into the sewage collection part 7 through the sewage outlet 6 , and then discharged to the purification breeding area 1 through the sewage discharge pipe 10 . Among them, the omnivorous fish in the purification breeding area 1 is used to purify the residual bait and feces discharged from the breeding pool 5, the filter-feeding species are used to filter and feed algae, and the plant purification area 2 is used to purify the ammonia nitrogen, nitrite and phosphorus in the water. and other substances. The disinfection area 4 communicates with the plant purification area 2, so that the water purified by the plant purification area 2 leads to the disinfection area 4, and is disinfected in the disinfection area 4, and the water after disinfection flows to the water inlet distribution part 8, and finally flows into the breeding Pond 5, thus realizing the water circulation inside the pond. The sewage suction pump 9 is used to suck the shrimp residue bait and feces mixture in the sewage collection part 7 into the sewage pipe 10 , and then discharge into the purification and breeding area 1 . The liquid level difference between the sewage collection part 7 and the culture pond 5 is controlled by the sewage suction pump 9, so as to realize the uniform control of the system water circulation, the sewage suction speed and the water inlet speed of each culture pond 5.

Further, the four cultivating ponds 5 are arranged around the sewage collecting part 7 , and the sewage collecting part 7 is arranged at the intersection of the four culturing ponds 5 . The sewage collection part 7 further includes a sewage suction well 71 and a sewage suction pipe 72 , and the sewage suction pipe 72 is respectively connected to the sewage suction well 71 and the sewage discharge port 6 . The residual bait and feces of the shrimp in the culture tank 5 flow into the sewage suction pipe 72 through the sewage outlet 6 , and then flow into the sewage suction well 71 . The diameters of the sewage suction pipes 72 are kept different by ≦10%; the lengths of the sewage suction pipes 72 are kept different by ≦10%, so as to ensure that the sewage discharge amount of each culture pond 5 is kept the same. The water inlet distribution part 8 includes an annular water inlet distribution well 81 and a water inlet pipe 82 arranged around the sewage suction well 71 . The annular water inlet distribution well 81 is provided with a water outlet 14 . The annular water inlet and distribution wells 81 are respectively connected to the respective culture ponds 5 through the water outlet 14 . The water inlet pipes 82 are respectively connected to the annular water inlet distribution well 81 and the disinfection area 4 . The sterilized purified water in the disinfection zone 4 flows into the annular water inlet distribution well 81 through the water inlet pipe 82 , and then flows into the culture pond 5 through the water outlet 14 .

Further, frequency conversion is used to control the flow rate of the sewage suction pump 9 and the liquid level of the sewage suction well 71 . Each breeding tank 5 maintains the same liquid level due to the communication between the sewage outlet 6 and the sewage collecting part 7 . The diameter of the sewage suction pipe 72 or the branch sewage pipe 73 is kept different by ≦10%; the length of the sewage suction pipe 72 or the branch sewage pipe 73 is kept different by ≦10%.

Further, the disinfection area 4 includes a water storage channel 11 arranged between the plant purification area 2 and the high water exchange rate culture area 3 and an ultraviolet sterilizer 12 arranged in the water storage channel 11, and the water storage channel 11 is provided with a connection to the plant purification area 2 Water inlet 13. The water purified by the plant purification area 2 leads to the water storage channel 11 through the water inlet 13, and is sterilized by the ultraviolet sterilizer 12, and the sterilized water flows to the annular water inlet distribution well 81 through the water inlet pipe 82, and finally flows into the culture. Pond 5, thus realizing the water circulation inside the pond.

The breeding ponds 5 can be constructed of brick walls, airtight enclosures and earth embankments. On the premise of not affecting the breeding effect, each breeding pond 5 can be effectively isolated from the purification breeding area 1 .

The energy-saving pond circulating aquaculture method of the present invention comprises the following steps:

Step 1, put omnivorous fish, crabs and filter-feeding species in the purification breeding area 1, plant aquatic plants in the plant purification area 2, and put shrimps in the high water exchange rate breeding area 3; purify the omnivorous food in the breeding area 1. The fish are used to purify the residual bait and feces discharged from the breeding tank 5, the filter-feeding species are used to filter and feed algae, and the plant purification zone 2 is used to purify substances such as ammonia nitrogen, nitrite and phosphorus in the water; among them, the filter-feeding species is silver carp One or more of fish, shellfish and snails; the aquatic plants are preferably submerged plants, and the purification effect is the best; Ensure the water quality of the entire pond;

Step 2, control the liquid level of the sewage suction well 7 by the sewage suction pump 9, so that it is lower than the liquid level of the cultivating pond 5, and the sewage of each cultivating pond 5 is naturally pressed into the suction through the sewage outlet 6 by the pressure generated by the liquid level difference. The sewage well 71 is then discharged into the purification breeding area 1 through the sewage pipe 10;

Step 3, the sewage discharged from the sewage suction well 71 is purified by the purification breeding area 1 and the plant purification area 2 in turn, wherein, the hydraulic retention time of the water flow discharged from the sewage suction well 71 in the plant purification area 2 is ≧3 hours, effectively guaranteeing shrimps The discharged residual bait and feces are purified by omnivorous fish, and substances such as ammonia nitrogen, nitrite and phosphorus in the water are purified by aquatic plants. The purified water is passed to the disinfection zone 4 for disinfection, and the disinfected water flows to the annular water inlet distribution well 8 , and finally is evenly distributed to each aquaculture pond 5 from the water outlet 14 . Specifically: the water purified by the plant purification zone 2 leads to the water storage channel 11 through the water inlet 13, and is disinfected by the ultraviolet sterilizer 12 for at least 1 minute to kill microorganisms such as bacteria in the water, and the sterilized water passes through the water inlet. The water pipe 82 flows to the annular water inlet distribution well 81, and finally flows into the culture pond 5 from the water outlet 14, so as to realize the water circulation inside the pond. Calculated according to the water body of the culture tank 5, the daily water exchange rate of the high water exchange rate culture area 3 and the purification culture area 1 is ≧15%, which can meet the survival needs of the shrimp in the culture tank 5.

The energy-saving pond circulating water culture method of the present invention can realize the water circulation purification process in the pond by itself without resorting to external conditions. Among them, through the sewage pipe 10, the excrement and residual bait in the high water exchange rate breeding area 3 are discharged to the purification breeding area 1 of the pond for other fish to eat, so as to realize the reuse of waste, and reduce the purification culture while solving the waste. The feeding cost of zone 1; at the same time, the plants planted in plant purification zone 2 in the pond have a purification effect on ammonia nitrogen, nitrite and phosphorus in the water, and finally the purified water is sterilized by disinfection zone 4 and then passed back to high exchange In the aquaculture area 3, the water circulation process within the entire pond is realized. In addition, the high water exchange rate breeding area 3 is isolated from the outside with a separate breeding space, which is not disturbed by fish and crabs, and can be fed with high-priced high-protein feed alone, so as not to be eaten by fish. And, because it is separated from the plant purification area 2, it is convenient to capture.

Example 2

In this embodiment, except for the number and arrangement of the culture ponds 5 being different, the others are the same as those in Embodiment 1.

In this embodiment, please refer to FIG. 3 , the culture ponds 5 are arranged side by side, and the sewage collection part 7 and the water inlet distribution part 8 are respectively arranged on both sides of the high water exchange rate culture area 3 . The sewage collecting part 7 includes a branch sewage pipe 73 arranged at the bottom of the culture pond 5 and a sewage collecting main pipe 74 and a sewage collecting tank 75 arranged at the side of the high water exchange rate culture area 3 . Each sewage outlet 6 is respectively connected to the sewage collecting main pipe 74 through the branch sewage pipe 73, and the sewage collecting main pipe 74 is also connected to the sewage collecting tank 75, so that the sewage in the culture pond 5 flows into the sewage collecting tank 75 through the branch sewage pipe 73 and the sewage collecting main pipe 74 in turn. Inside. The diameters of the branch sewage pipes 73 are kept different by ≦10%; the lengths of the branch sewage pipes 73 are kept different by ≦10%, so as to ensure that the sewage discharge amount of each culture pond 5 is kept the same. The water inlet distribution part 8 includes a water inlet main pipe 83 and a water inlet branch pipe 84 . One end of the water inlet main pipe 83 is connected to the disinfection area 4 , and the other end is connected to each culture pool 5 through the water inlet branch pipes 84 respectively. The purified water after disinfection in the disinfection zone 4 passes through the water inlet main pipe 83 and the water inlet branch pipes 84 in sequence, and flows into each aquaculture pond 5 from each water inlet branch pipe 84 respectively.

Example 3

In this embodiment, except for the number of culture ponds 5 being different, the others are the same as in Embodiment 1.

In this embodiment, three breeding ponds 5 are set. The three cultivating ponds 5 are arranged in a zigzag shape. The three cultivating ponds 5 are arranged around the sewage collecting part 7 , and the sewage collecting part 7 is arranged at the intersection of the three culturing ponds 5 . The sewage collection part 7 includes a sewage suction well 71 and a sewage suction pipe 72 , and the sewage suction pipe 72 is respectively connected to the sewage suction well 71 and the sewage discharge port 6 . The residual bait and feces of the shrimp in the culture tank 5 flow into the sewage suction pipe 72 through the sewage outlet 6 , and then flow into the sewage suction well 71 . The diameters of the sewage suction pipes 72 are kept different by ≦10%; the lengths of the sewage suction pipes 72 are kept different by ≦10%, so as to ensure that the sewage discharge amount of each culture pond 5 is kept the same. The water inlet distribution part 8 includes an annular water inlet distribution well 81 and a water inlet pipe 82 arranged around the sewage suction well 71. The annular water inlet distribution well 81 is communicated with the culture pool 5, and the water inlet pipe 82 is respectively connected with the annular water inlet distribution well 81 and the disinfection area 4. . The sterilized purified water in the disinfection zone 4 flows into the annular water inlet distribution well 81 through the water inlet pipe 82 , and then flows into the culture pond 5 .

Example 4

In this embodiment, except for the number of culture ponds 5 being different, the others are the same as in Embodiment 1.

In this embodiment, there are two breeding ponds 5 . Two culture ponds 5 are arranged side by side. The two cultivating ponds 5 are arranged around the sewage collecting part 7 , and the sewage collecting part 7 is arranged at the intersection of the two culturing ponds 5 . The sewage collection part 7 includes a sewage suction well 71 and a sewage suction pipe 72 , and the sewage suction pipe 72 is respectively connected to the sewage suction well 71 and the sewage discharge port 6 . The residual bait and feces of the shrimp in the culture tank 5 flow into the sewage suction pipe 72 through the sewage outlet 6 , and then flow into the sewage suction well 71 . The diameters of the sewage suction pipes 72 are kept different by ≦10%; the lengths of the sewage suction pipes 72 are kept different by ≦10%, so as to ensure that the sewage discharge amount of each culture pond 5 is kept the same. The water inlet distribution part 8 includes an annular water inlet distribution well 81 and a water inlet pipe 82 arranged around the sewage suction well 71. The annular water inlet distribution well 81 is communicated with the culture pool 5, and the water inlet pipe 82 is respectively connected with the annular water inlet distribution well 81 and the disinfection area 4. . The sterilized purified water in the disinfection zone 4 flows into the annular water inlet distribution well 81 through the water inlet pipe 82 , and then flows into the culture pond 5 .

It can be understood that the cultivation ponds 5 are not limited to two, three or four, and in other embodiments, they may be more than four.

Although the present invention has been described in detail above with specific embodiments, some modifications or improvements can be made on the basis of the present invention, which is obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (10)

1. An energy-saving pond recirculating aquaculture method is applied to a pond recirculating aquaculture system and is characterized in that the pond recirculating aquaculture system comprises a purification aquaculture area (1), a plant purification area (2), a disinfection area (4) and a high water change rate aquaculture area (3) which are sequentially communicated, wherein the high water change rate aquaculture area (3) is spatially separated from other areas by adopting physical materials;

the high water change rate culture area (3) comprises at least two culture ponds (5), and the bottom of each culture pond (5) is provided with a sewage discharge outlet (6) respectively; the high water change rate culture area (3) further comprises a sewage collection part (7) and a water inlet distribution part (8), the sewage collection part (7) is provided with a sewage discharge pipe (10) and a sewage suction pump (9) connected with the sewage discharge pipe (10), the sewage discharge pipe (10) is respectively communicated with the sewage discharge port (6) and the purification culture area (1) through the sewage suction pump (9), and the water inlet distribution part (8) is respectively communicated with the culture pond (5) and the disinfection area (4);

the energy-saving pond circulating water aquaculture method comprises the following steps:

step 1, feeding omnivorous fishes, crabs and filter feeding varieties into a purification culture area (1), planting water plants in a plant purification area (2), and feeding shrimps into a high water change rate culture area (3);

step 2, controlling the liquid level of the sewage collecting part (7) by a sewage suction pump (16) to be lower than the liquid level of the culture ponds (5), naturally pressing the sewage of each culture pond (5) into the sewage collecting part (7) through a sewage outlet (6) by the pressure generated by liquid level difference, and then discharging the sewage into the purified culture area (1) through a sewage discharge pipe (10);

and 3, introducing the water purified in the purified culture area (1) and the plant purification area (2) into a disinfection area (4) for disinfection, making the disinfected water flow to a water inlet distribution part (8), and finally uniformly distributing the water to each culture pond (5).

2. The energy-saving pond recirculating aquaculture method of claim 1, characterized in that the aquaculture pond (5) is arranged around the sewage collecting part (7), the sewage collecting part (7) further comprises a sewage suction well (71) and a sewage suction pipe (72), and the sewage suction pipe (72) is respectively communicated with the sewage suction well (71) and the sewage discharge outlet (6); the water inlet distribution part (8) comprises an annular water inlet distribution well (81) and a water inlet pipe (82) which are arranged around the sewage suction well (71), the annular water inlet distribution well (81) is respectively communicated with each culture pond (5), and the water inlet pipe (82) is respectively communicated with the annular water inlet distribution well (81) and the disinfection area (4).

3. The energy-saving pond recirculating aquaculture method of claim 1, characterized in that the aquaculture ponds (5) are arranged in parallel, the sewage collecting part (7) and the water inlet distributing part (8) are respectively arranged at two sides of the aquaculture area (3) with high water change rate; the sewage collecting part (7) comprises a branch sewage pipe (73) arranged at the bottom of the culture pond (5), a sewage collecting main pipe (74) and a sewage collecting groove (75) which are arranged at the side edge of the high water change rate culture area (3), each sewage draining outlet (6) is respectively communicated with the sewage collecting main pipe (74) through the branch sewage pipe (73), and the sewage collecting main pipe (74) is also communicated with the sewage collecting groove (75); the water inlet distribution part (8) comprises a water inlet header pipe (83) and water inlet branch pipes (84), one end of the water inlet header pipe (83) is communicated with the disinfection area (4), and the other end of the water inlet header pipe is communicated with each culture pond (5) through the water inlet branch pipes (84).

4. The energy-saving pond recirculating aquaculture method of claim 2 or 3, characterized in that the flow of the sewage suction pump (9) and the liquid level of the sewage suction well (7) are controlled by frequency conversion, and the liquid level of each aquaculture pond (5) is kept the same because the sewage outlet (6) is communicated with the sewage collection part (7); the pipe diameter of the sewage suction pipe (72) or the branch sewage pipe (73) is kept less than or equal to 10%; the length of the sewage suction pipe (72) or the branch sewage pipe (73) is kept less than or equal to 10%.

5. An energy-saving pond recirculating aquaculture method according to claim 1, characterized in that the disinfection zone (4) comprises a water storage channel (11) arranged between the plant purification zone (2) and the high water change rate aquaculture zone (3) and an ultraviolet sterilizer (12) arranged in the water storage channel (11), and the water storage channel (11) is provided with a water inlet (13) communicated with the plant purification zone (2).

6. The energy-saving pond recirculating aquaculture method of claim 1, wherein in step 1, the filter-feeding variety is one or more than two of chubs, shellfishes and snails; the aquatic weeds are submerged plants.

7. The energy-saving pond recirculating aquaculture method of claim 1, wherein in step 1, the water volume ratio of the purification aquaculture area (1) to the high water change rate aquaculture area (3) is not less than 2.

8. An energy-saving pond recirculating aquaculture method according to claim 1, characterized in that in step 3 the hydraulic retention time in the disinfection zone (4) is at least 1 minute.

9. The energy-saving pond recirculating aquaculture method of claim 1, characterized in that in step 3, the hydraulic retention time of the water flow discharged from the sewage collecting part (7) in the plant purification area (2) is not less than 3 hours.

10. The energy-saving pond recirculating aquaculture method of claim 1, wherein in the steps 1-3, the daily water change rate of the aquaculture area (3) with high water change rate and the purified aquaculture area (1) is not less than 15% according to the water body of the aquaculture pond (5).

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