Energy-saving recirculating aquaculture system

Abstract

The invention discloses an energy-saving recirculating aquaculture system which comprises a fishpond, and the cross section of the bottom end of the fishpond is set to be trapezoidal; a second slope is arranged on the inner wall of the biological purification tank, vesuvianite is uniformly distributed at the bottom end of the second slope, and microorganisms for biologically purifying sewage are uniformly adsorbed on the surface of the vesuvianite; wherein the fishpond and the biological purification pond are connected through a large-particle residue filter, the device relates to the technical field of aquaculture systems, foamed aluminum plates are arranged in a plant planting groove and used for supporting the bottoms of a compressed straw layer and a soil layer, and the use safety of the device is improved; meanwhile, sewage containing fish excrement can conveniently and slowly enter a soil layer, continuous and stable nutrient supply is carried out, protection on plant growth is improved, excessive nutrients can be avoided, stable nutrient supply can be carried out, and the practicability of equipment use is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture systems, in particular to an energy-saving circulating aquaculture system. Background Art

[0002] There are many problems in the traditional aquaculture model. On the one hand, the large amount of waste such as fish feces and residual feed generated during the breeding process not only easily pollutes the breeding water, affects the growth environment and health of fish, but also requires a lot of manpower and material resources to clean and treat. On the other hand, in order to maintain good breeding water quality, frequent water changes are required, which wastes a lot of water resources. At the same time, it is not convenient to recycle fish excrement reasonably. Fish excrement contains nitrogen, phosphorus, potassium and other nutrients necessary for plant growth. Nitrogen is an important component of plant protein and chlorophyll. It can promote the luxuriant branches and leaves of green plants, enhance photosynthesis, make the leaves more emerald, and improve the ornamental value. For example, lawn grass with sufficient nitrogen is bright green and grows vigorously. Phosphorus plays a key role in the root development, flowering and fruiting of plants. It can help the roots of green plants take root deeper, absorb more nutrients, and improve the resistance of plants. For example, when planting flowers, an appropriate amount of phosphorus can make the flowers bigger and brighter. Potassium can enhance the stem strength of plants, improve the disease resistance and lodging resistance of plants, and enable green plants to grow healthily in harsh environments. For example, some tall street trees can be made thicker and more sturdy with sufficient potassium to resist wind and rain. It can also improve soil structure: fish excrement, as an organic substance, can improve the physical structure of the soil. It can increase the porosity of the soil, making the soil more loose and breathable, which is conducive to the growth and breathing of plant roots. For example, adding fish excrement to clay can make the originally compact soil loose and promote the extension of the root system. At the same time, it can also improve the soil's ability to retain water and fertilizer, reduce nutrient loss, allow the soil to better store water and nutrients, provide green plants with continuous growth needs, and promote microbial activity: these excrement can provide a rich source of food for microorganisms in the soil and promote the reproduction and activity of microorganisms. In the process of decomposing fish excrement, microorganisms will convert the organic nutrients in it into inorganic nutrients, which are easier for plants to absorb and utilize. For example, microorganisms such as bacteria and fungi can decompose nitrogen-containing organic matter into ammonium nitrogen for plant roots to absorb. Moreover, the activities of microorganisms can also produce some beneficial substances, such as vitamins, hormones, etc., which stimulate the growth of green plants, enhance plant immunity, and can play a very good role in the cultivation of green plants. However, in traditional fish farming systems, there is a lack of automated structures for recycling fish manure, and a large amount of manpower is required to clean the farming system, resulting in a lot of waste and inconvenient to improve energy-saving and environmental protection effects.

[0003] In addition, as people pay more and more attention to environmental protection and sustainable use of resources, it is of great practical significance to develop an energy-saving recirculating aquaculture system that can realize water resource recycling, waste resource utilization, and automated and efficient operation. Summary of the invention

[0004] The object of the present invention is to provide an energy-saving circulating aquaculture system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An energy-saving circulating water aquaculture system, comprising A fish pond, wherein the bottom cross-section of the fish pond is arranged in a trapezoidal shape; A biological purification pool, wherein the inner wall of the biological purification pool is provided with a second slope, and the bottom end of the second slope is provided with evenly distributed volcanic rocks, and the surface of the volcanic rocks evenly adsorbs microorganisms used for biological purification of sewage; The fish pond and the biological purification pond are connected via a large particle residue filter, wherein the large particle residue filter comprises a filter bin and a first filter screen installed at the end of the filter bin; A plant planting trough, wherein a foam aluminum plate is inserted and installed on the inner wall of the plant planting trough, a compressed straw layer is fixedly installed on the top of the foam aluminum plate, and a soil layer is provided on the top of the compressed straw layer; A circulation disinfection component, the circulation disinfection component comprises a self-priming pump and a disinfector installed at the output end of the self-priming pump and connected to the output end of the self-priming pump for disinfecting water, wherein the output end of the disinfector is connected to the fish pond; The liquid level in the fish culture pond is higher than the liquid level in the biological purification pond, and the liquid level in the biological purification pond is higher than the liquid level in the plant planting tank.

[0006] In a preferred embodiment of the present invention, the bottom inner wall of the fish pond is provided with a first slope, the lowest point of the bottom end of the first slope is fixedly connected to the input end outer wall of the filter bin via a first conduit, and the output end outer wall of the filter bin is fixedly connected to the biological purification tank via a second conduit.

[0007] In a preferred embodiment of the present invention, a drain pipe is provided at the bottom end of the filter bin, the input end of the drain pipe is an outwardly expanded opening, the input end of the drain pipe is located on the left side of the first filter screen, and a ball valve for controlling the discharge of sewage from the drain pipe is installed on the outer wall of the bottom end of the drain pipe.

[0008] In a preferred embodiment of the present invention, the biological purification tank includes a first rectangular sewage outlet, the bottom outer wall of the first rectangular sewage outlet is rotatably connected to a first sewage cover plate by a hinge, and a first sealing ring is fixedly installed at the connection between the first sewage cover plate and the inner wall of the first rectangular sewage outlet.

[0009] In a preferred embodiment of the present invention, the bottom outer wall of the first sewage cover plate is fixedly connected to the bottom outer wall of the biological purification tank via a buckle, and the buckle includes a hook rotatably connected to the outer wall of the biological purification tank.

[0010] In a preferred embodiment of the present invention, a hanging rod is fixedly installed on the side wall of the first sewage cover plate, the hook is connected with the hanging rod by a clip, and a second filter screen is fixed on the top of the water outlet on the bottom inner wall of the biological purification tank.

[0011] In a preferred embodiment of the present invention, the plant planting trough includes a second rectangular drain outlet, which is opened on the outer wall of the bottom end of the plant planting trough, and the inner wall of the second rectangular drain outlet is sealed and connected to the second sewage cover plate, and the second sewage cover plate is fixedly installed at the connection between the second rectangular drain outlet.

[0012] In a preferred embodiment of the present invention, the second sewage cover plate is detachably fixedly connected to the bottom outer wall of the plant planting trough by bolts, an annular support plate is fixedly installed around the inner wall of the plant planting trough, a foam aluminum plate is clamped and installed on the top outer wall of the annular support plate, and / volume of the compressed straw layer is immersed in the liquid surface at the bottom of the plant planting trough.

[0013] In a preferred embodiment of the present invention, the self-priming pump is fixedly mounted on the outer wall of the plant planting trough, the input end of the self-priming pump is connected to the inner wall of the plant planting trough through a third conduit, and the output end of the self-priming pump is connected to the sterilizer through a fourth conduit, and a sterilization chamber is provided on the inner wall of the sterilizer.

[0014] In a preferred embodiment of the present invention, the disinfection chamber is made of quartz glass, ultraviolet disinfection lamps are evenly fixedly installed around the disinfection chamber, a protective cover is fixedly installed on the outer wall of the ultraviolet disinfection lamp, and the output end of the disinfection chamber is connected to the outer wall of the fish pond through a fifth conduit.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

[0016] 1. By setting up a biological purification pool and a plant planting tank for use together, it is convenient to filter the fish feces produced in the fish pond, eliminate ammonia and nitrogen substances, and facilitate the automatic circulation and water exchange of sewage in the fish pond, thereby improving work efficiency. At the same time, it is convenient to use fish excrement as nutrients for plant growth, facilitate waste utilization, and improve the energy-saving and environmental protection effect of equipment use; 2. By arranging a foam aluminum plate in the plant planting trough to support the bottom of the compressed straw layer and the soil layer, the compressed straw layer and the soil layer are prevented from falling directly to the bottom of the plant planting trough, thereby improving the safety of the equipment. At the same time, it is convenient for sewage containing fish excrement to slowly enter the soil layer, so as to provide continuous and stable nutrients, thereby improving the protection of plant growth, avoiding excessive nutrients, and providing nutrients stably, thereby improving the practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a schematic diagram of the main structure of an energy-saving circulating aquaculture system; Figure 2 It is a schematic diagram of a top view structure of an energy-saving circulating aquaculture system; Figure 3 It is a schematic diagram of the structure of an energy-saving circulating aquaculture system viewed from above; Figure 4 It is a rear view structural diagram of an energy-saving circulating aquaculture system; Figure 5 It is a schematic diagram of the structure of a large particle residue filter in an energy-saving circulating aquaculture system; Figure 6 It is a schematic diagram of the structure of the first drain plate in an energy-saving circulating aquaculture system; Figure 7 A schematic diagram of a lock structure in an energy-saving circulating aquaculture system; Figure 8 It is a schematic diagram of the cross-sectional structure of a plant planting tank in an energy-saving circulating water aquaculture system; Fig. 9 This is a schematic diagram of the structure of a disinfector in an energy-saving circulating aquaculture system.

[0018] In the figure: 100, fish pond; 110, first slope; 200, first conduit; 210, second conduit; 220, filter chamber; 221, first filter screen; 222, sewage pipe; 223, ball valve; 300, biological purification tank; 310, rectangular sewage outlet; 301, second filter screen; 320, first sewage cover; 330, hook; 331, hanging rod; 340, second slope; 400, plant planting trough; 410, second rectangular drain outlet; 420, second sewage cover; 430, annular support plate; 440, foam aluminum plate; 450, compressed straw layer; 460, soil layer; 500, self-priming pump; 510, fourth conduit; 520, sterilizer; 521, disinfection chamber; 522, ultraviolet disinfection lamp; 523, protective cover; 530, fifth conduit. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] Example 1: Figure 1-Figure 6 ,include A fish pond 100, wherein the bottom cross-section of the fish pond 100 is configured to be trapezoidal; A biological purification pool 300, wherein a second slope 340 is provided on the inner wall of the biological purification pool 300, and volcanic rocks are evenly distributed at the bottom of the second slope 340, and the surface of the volcanic rocks evenly adsorbs microorganisms used for biological purification of sewage; The fish pond 100 and the biological purification pond 300 are connected via a large particle residue filter, and the large particle residue filter includes a filter chamber 220 and a first filter screen 221 installed at the end of the filter chamber 220; A plant planting trough 400, an inner wall of the plant planting trough 400 is plugged with a foam aluminum plate 440, a compressed straw layer 450 is fixedly installed on the top of the foam aluminum plate 440, and a soil layer 460 is provided on the top of the compressed straw layer 450; A circulation disinfection component, the circulation disinfection component includes a self-priming pump 500 and a disinfector 520 installed at the output end of the self-priming pump 500 and connected to disinfect water, and the output end of the disinfector 520 is connected to the fish pond 100; The liquid level of the fish pond 100 is higher than the liquid level of the biological purification pond 300 , and the liquid level of the biological purification pond 300 is higher than the liquid level of the plant planting tank 400 .

[0021] The specific usage scenario of this embodiment is: by setting up a biological purification pool 300 and a plant planting trough 400 for use together, it is convenient to filter the fish feces produced in the fish pond 100, eliminate ammonia and nitrogen substances, and facilitate the automatic circulation and water exchange of the sewage in the fish pond 100, thereby improving work efficiency. At the same time, it is convenient to supply fish excrement as nutrients to plant growth, facilitate waste utilization, and improve the energy-saving and environmental protection effect of equipment use. By setting a foam aluminum plate 440 in the plant planting trough 400 to support the bottom of the compressed straw layer 450 and the soil layer 460, the compressed straw layer 450 and the soil layer 460 are prevented from falling directly into the bottom of the plant planting trough 400, thereby improving the safety of equipment use, and at the same time, it is convenient for the sewage containing fish excrement to slowly enter the soil layer 460 for continuous and stable nutrient supply, thereby improving the protection of plant growth, avoiding excessive nutrients, and providing nutrients stably, thereby improving the practicality of equipment use.

[0022] Example 2: Figure 1-Figure 4 , including a fish pond 100, the bottom cross-section of the fish pond 100 is set to be trapezoidal; a biological purification pool 300, the inner wall of the biological purification pool 300 is provided with a second slope 340, the bottom of the second slope 340 is provided with uniformly distributed volcanic rocks, the surface of the volcanic rocks uniformly adsorbs microorganisms used for biological purification of sewage, wherein the fish pond 100 and the biological purification pool 300 are connected through a large particle residue filter, the large particle residue filter includes a filter bin 220 and a first filter screen 221 installed at the end of the filter bin 220, a plant planting tank 400, and a plant A foam aluminum plate 440 is installed on the inner wall of the planting trough 400, a compressed straw layer 450 is fixedly installed on the top of the foam aluminum plate 440, a soil layer 460 is provided on the top of the compressed straw layer 450, and a circulating disinfection component, the circulating disinfection component includes a self-priming pump 500 and a disinfector 520 installed at the output end of the self-priming pump 500 and connected to disinfect water, the output end of the disinfector 520 is connected to the fish pond 100, the liquid level of the fish pond 100 is higher than the liquid level of the biological purification tank 300, and the liquid level of the biological purification tank 300 is higher than the liquid level of the plant planting trough 400.

[0023] The bottom inner wall of the fish pond 100 is provided with a first slope 110, the lowest point of the bottom end of the first slope 110 is fixedly connected to the outer wall of the input end of the filter chamber 220 through the first conduit 200, the outer wall of the output end of the filter chamber 220 is fixedly connected to the biological purification tank 300 through the second conduit 210, and the bottom end of the filter chamber 220 is provided with a sewage pipe 222, the input end of the sewage pipe 222 is an outwardly expanded open mouth, the input end of the sewage pipe 222 is located on the left side of the first filter net 221, and the bottom outer wall of the sewage pipe 222 is installed with a ball valve 223 for controlling the sewage discharge of the sewage pipe 222.

[0024] The specific usage scenario of this embodiment is: by setting up the filter bin 220 and the sewage pipe 222 for use together, it is convenient to transport the water in the fish pond 100 to the biological purification tank 300, and the large particles of impurities in the fish pond 100 can be filtered, thereby removing impurities in the sewage and improving the filtration efficiency. The large particles of impurities in the sewage pipe 222 can be conveniently discharged by opening the ball valve 223.

[0025] Example 3: Figure 1 and Figure 2 , Figure 7The biological purification tank 300 includes a first rectangular sewage outlet 310, the bottom outer wall of the first rectangular sewage outlet 310 is rotatably connected to the first sewage cover plate 320 through a hinge, and a first sealing ring (not shown in the figure) is fixedly installed at the connection between the first sewage cover plate 320 and the inner wall of the first rectangular sewage outlet 310. The bottom outer wall of the first sewage cover plate 320 and the bottom outer wall of the biological purification tank 300 are fixedly connected by a buckle, and the buckle includes a hook 330 rotatably connected to the outer wall of the biological purification tank 300, and a hanging rod 331 is fixedly installed on the side wall of the first sewage cover plate 320. The hook 330 and the hanging rod 331 are connected by a snap connection, and a second filter screen 301 is fixed on the top of the water outlet on the bottom inner wall of the biological purification tank 300.

[0026] The specific usage scenario of this embodiment is as follows: by setting a buckle to facilitate and quickly complete the fixing and releasing of the first sewage cover 320, the convenience of operation is improved. By setting the first sewage cover 320 and the first rectangular sewage outlet 310, it is convenient to clean the bottom of the biological purification tank 300. When cleaning the residual fish feces at the first rectangular sewage outlet 310, the first sewage cover 320 can be opened to clean the residual fish feces and impurities in the biological purification tank 300, thereby improving the convenience of operation and the practicality of the equipment. The second filter 301 is made of 304 metal stainless steel.

[0027] Example 4: Figure 8 The plant planting trough 400 includes a second rectangular drain outlet 410, which is provided on the outer wall of the bottom end of the plant planting trough 400. The inner wall of the second rectangular drain outlet 410 is sealed and connected to the second sewage cover plate 420. The second sewage cover plate 420 is fixedly installed at the connection with the second rectangular drain outlet 410. The second sewage cover plate 420 is detachably fixedly connected to the bottom outer wall of the plant planting trough 400 by bolts. An annular support plate 430 is fixedly installed around the inner wall of the plant planting trough 400. The top outer wall of the annular support plate 430 is clamped and installed with a foam aluminum plate 440. 2 / 3 of the volume of the compressed straw layer 450 is immersed in the liquid surface at the bottom of the plant planting trough 400. The thickness of the compressed straw layer 450 is set to 30 cm-50 cm.

[0028] The specific use scenario of this embodiment is: by setting a second rectangular drain port 410, and sealing and installing a second drainage cover plate 420 at the bottom end of the second rectangular drain port 410, it is convenient to open and clean the bottom of the plant planting trough 400, and by setting a compressed straw layer 450, it is used to transport the water containing fish excrement in the plant planting trough 400 to the soil layer 460, so as to facilitate the supply of nutrients to the plants planted on the top of the soil layer 460. By setting a compressed straw layer 450, it is convenient to prevent impurities that have not been completely filtered from entering the soil, thereby improving the protection of the soil and facilitating the hardening of the soil. The role of straw is to absorb the mixed liquid (fertilizer water) of water and fish excrement into the soil through capillary action. The gaps in the straw are generally large, which has a certain filtering effect on fish excrement. The fish excrement dissolved in the water can enter the soil. The advantage is to avoid excessive fish excrement, which leads to soil eutrophication and affects the growth of plants, and avoids inhibiting the growth of plants.

[0029] Example 5: Figure 5 and Fig. 9 The self-priming pump 500 is fixedly installed on the outer wall of the plant planting tank 400. The input end of the self-priming pump 500 is connected to the inner wall of the plant planting tank 400 through the third conduit. The output end of the self-priming pump 500 is connected to the sterilizer 520 through the fourth conduit 510. The inner wall of the sterilizer 520 is provided with a sterilization chamber 521. The sterilization chamber 521 is made of quartz glass. Quartz glass has a low absorption coefficient in the ultraviolet band, which means that it has a weak absorption capacity for ultraviolet rays. Most ultraviolet rays can pass through the quartz glass without being absorbed and converted into other forms. Energy is guaranteed to have high transmittance of ultraviolet rays, and high refractive index uniformity: the refractive index uniformity of quartz glass is good, and when ultraviolet rays pass through, the drastic change in the refractive index will not cause scattering and refraction disorder of light, thereby being able to maintain good light transmittance, so that ultraviolet rays can pass through more smoothly, ultraviolet disinfection lamps 522 are evenly fixedly installed around the disinfection chamber 521, and a protective cover 523 is fixedly installed on the outer wall of the ultraviolet disinfection lamp 522, and the output end of the disinfection chamber 521 is connected to the outer wall of the fish pond 100 through the fifth conduit 530.

[0030] The specific use scenario of this embodiment is: by setting a self-priming pump 500 to transport the water in the plant planting tank 400 to the fish pond 100, a filter element is installed inside the output end of the self-priming pump 500 to filter the water to prevent the impurities in the plant planting tank 400 from being sucked into the self-priming pump 500, and by making the disinfection chamber 521 of quartz glass, the ultraviolet disinfection lamp 522 can pass through the quartz glass to disinfect the water in the disinfection chamber 521. Quartz glass is a special glass with silicon dioxide as the main component, with extremely low hydroxyl content and high ultraviolet transmittance. Within the ultraviolet wavelength range of 200-400nm, the transmittance can reach more than 90%, which can allow ultraviolet rays to penetrate efficiently and effectively kill bacteria, viruses and other pathogens in the water body. It also has good chemical stability and is resistant to corrosion by chemical substances such as acids and alkalis. It is not easy to be corroded in the complex water quality environment of the circulating aquaculture system, ensuring long-term stable performance.

[0031] The working principle of the present invention is as follows: when in use, a person skilled in the art transfers water to a fish pond 100 for fish farming. Impurities and excrement generated by the activities of the fish in the fish pond 100 flow to the first conduit 200 through the first slope 110 under the action of gravity, and are transferred to the filter bin 220 through the first conduit 200. Under the filtering and intercepting action of the first filter screen 221, large particles of impurities in the sewage discharged from the fish pond 100 fall into the sewage pipe 222 under the action of gravity, and are collected in the sewage pipe 222. Small particles of excrement pass through the first filter screen 221 and are transferred to the biological purification pool 300 through the second conduit 210. By opening the ball valve 223 at the bottom of the sewage pipe 222, large particles of impurities in the sewage pipe 222 and fish excrement that have not been discharged are removed. The sewage discharged and then entering the biological purification pool 300 is filtered by the volcanic rocks in the biological purification pool 300, and microorganisms for digesting ammonia and nitrogen substances in the sewage are distributed on the surface of the volcanic rocks. Then, under the action of gravity, the sewage containing fish excrement in the biological purification pool 300 is transported to the plant planting tank 400 through the water pipe again. Under the capillary action of the compressed straw layer 450, the sewage is transported to the soil layer 460 through the compressed straw layer 450 to supply nutrients to the plants planted in the soil layer 460. Then, by turning on the self-priming pump 500, the filtered water in the plant planting tank 400 is transported to the disinfection chamber 521, and the water in the disinfection chamber 521 is disinfected by turning on the ultraviolet disinfection lamp 522. Then, the disinfected water is transported to the fish pond 100 for recycling.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An energy-saving circulating aquaculture system, characterized in that: include A fish pond (100), wherein the bottom cross-section of the fish pond (100) is arranged to be trapezoidal; A biological purification pool (300), wherein a second slope (340) is provided on an inner wall of the biological purification pool (300), and volcanic rocks are evenly distributed at the bottom of the second slope (340), and microorganisms used for biological purification of sewage are evenly adsorbed on the surface of the volcanic rocks; The fish pond (100) and the biological purification pond (300) are connected via a large particle residue filter, wherein the large particle residue filter comprises a filter bin (220) and a first filter screen (221) installed at the end of the filter bin (220); A plant planting trough (400), wherein a foam aluminum plate (440) is inserted and installed on the inner wall of the plant planting trough (400), a compressed straw layer (450) is fixedly installed on the top of the foam aluminum plate (440), and a soil layer (460) is provided on the top of the compressed straw layer (450); A circulation disinfection component, the circulation disinfection component comprising a self-priming pump (500) and a disinfector (520) installed at the output end of the self-priming pump (500) and connected to disinfect water, wherein the output end of the disinfector (520) is connected to the fish pond (100); The liquid level of the fish culture pond (100) is higher than the liquid level of the biological purification pond (300), and the liquid level of the biological purification pond (300) is higher than the liquid level of the plant planting tank (400).

2. The energy-saving circulating aquaculture system according to claim 1, characterized in that: The inner wall at the bottom end of the fish pond (100) is provided with a first slope (110), the lowest point at the bottom end of the first slope (110) is fixedly connected to the outer wall of the input end of the filter chamber (220) via a first conduit (200), and the outer wall of the output end of the filter chamber (220) is fixedly connected to the biological purification tank (300) via a second conduit (210).

3. The energy-saving circulating aquaculture system according to claim 2, characterized in that: A sewage pipe (222) is provided at the bottom end of the filter bin (220); the input end of the sewage pipe (222) is an outwardly expanded open end; the input end of the sewage pipe (222) is located on the left side of the first filter screen (221); and a ball valve (223) for controlling sewage discharge from the sewage pipe (222) is installed on the outer wall of the bottom end of the sewage pipe (222).

4. The energy-saving circulating aquaculture system according to claim 1, characterized in that: The biological purification pool (300) comprises a first rectangular sewage outlet (310), the bottom outer wall of the first rectangular sewage outlet (310) is rotatably connected to a first sewage outlet cover plate (320) via a hinge, and a first sealing ring is fixedly installed at the connection between the first sewage outlet cover plate (320) and the inner wall of the first rectangular sewage outlet (310).

5. The energy-saving circulating aquaculture system according to claim 4, characterized in that: The bottom outer wall of the first sewage discharge cover plate (320) is fixedly connected to the bottom outer wall of the biological purification tank (300) via a buckle, and the buckle comprises a hook (330) rotatably connected to the outer wall of the biological purification tank (300).

6. The energy-saving circulating aquaculture system according to claim 5, characterized in that: A hanging rod (331) is fixedly mounted on the side wall of the first sewage discharge cover plate (320), the hook (330) is engaged and connected with the hanging rod (331), and a second filter screen (301) is fixed on the top of the water outlet on the bottom inner wall of the biological purification pool (300).

7. The energy-saving circulating aquaculture system according to claim 1, characterized in that: The plant planting trough (400) comprises a second rectangular drain outlet (410), the second rectangular drain outlet (410) being arranged on the outer wall at the bottom end of the plant planting trough (400), the inner wall of the second rectangular drain outlet (410) being sealably connected to a second sewage discharge cover plate (420), and the second sewage discharge cover plate (420) being fixedly installed at the connection with the second rectangular drain outlet (410).

8. The energy-saving circulating aquaculture system according to claim 7, characterized in that: The second sewage discharge cover plate (420) is detachably fixedly connected to the bottom outer wall of the plant planting trough (400) by means of bolts, an annular support plate (430) is fixedly mounted around the inner wall of the plant planting trough (400), a foam aluminum plate (440) is clamped and mounted on the top outer wall of the annular support plate (430), and 2 / 3 of the volume of the compressed straw layer (450) is immersed in the liquid surface at the bottom of the plant planting trough (400).

9. The energy-saving circulating aquaculture system according to claim 1, characterized in that: The self-priming pump (500) is fixedly mounted on the outer wall of the plant planting trough (400); the input end of the self-priming pump (500) is connected to the inner wall of the plant planting trough (400) via a third conduit; the output end of the self-priming pump (500) is connected to the sterilizer (520) via a fourth conduit (510); and a sterilization chamber (521) is provided on the inner wall of the sterilizer (520).

10. The energy-saving circulating aquaculture system according to claim 9, characterized in that: The disinfection chamber (521) is made of quartz glass. Ultraviolet disinfection lamps (522) are evenly and fixedly installed around the disinfection chamber (521). A protective cover (523) is fixedly installed on the outer wall of the ultraviolet disinfection lamp (522). The output end of the disinfection chamber (521) is connected to the outer wall of the fish pond (100) through a fifth conduit (530).

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