CN216219598U - A bionical attitude biological purification system for recirculating aquaculture - Google Patents

Abstract

The utility model discloses a bionic biological purification system for circulating water culture, which comprises a treatment pond and a culture pond; the treatment tank is enclosed into a water channel through a partition plate, and a biological treatment system is arranged in the water channel; one end of the water channel is provided with a circulating pump group, and the other end of the water channel is provided with a filtering system; the partition wall is arranged between the treatment pool and the culture pool, and the outlet of the circulating pump set penetrates through the partition wall and extends into the culture pool; the separation wall is detachably connected with an isolation net, and the isolation net is arranged corresponding to the filtering system. The utility model has compact structure, high speed for treating and purifying sewage, good treatment effect, internal circulation of sewage treatment, no need of frequently replacing internal water, little pollution to the outside, water resource saving and contribution to the propulsion of sustainable development; the sewage is biologically treated, so that the energy consumption is low, the treatment is thorough, the culture consumption can be reduced, the quality of aquatic products is improved, and the culture benefit is greatly improved.

Description

A bionical attitude biological purification system for recirculating aquaculture

Technical Field

The utility model relates to the technical field of aquaculture, in particular to a bionic biological purification system for circulating water aquaculture.

Background

The circulating aquaculture system is considered to represent one of the leading production modes in the development direction of 21 st century aquaculture due to its advantages of water saving, land saving, environmental friendliness and the like. The aquaculture system is popular because it can keep the best physiological and ecological state of the cultured object under the condition of high-density culture, thereby achieving the health and rapid growth and improving the yield and quality of the unit water body to the maximum extent. In the circulating culture process, the treatment of sewage is an important step, and if the sewage treatment cannot be well done, the circulating culture cannot play a due role.

However, the treatment of sewage in the existing circulating aquaculture only depends on filtration and various neutralizing agents are added according to chemical methods, the treatment effect is not easy to control, the added neutralizing agents are easy to cause the pH value imbalance of water or the inorganic matter enrichment, the speed and the yield of aquaculture are influenced, the benefit is reduced, and even aquatic products are poisoned and collected. Therefore, the purification system constructed according to the biological purification and the bionic principle has important significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bionic biological purification system for circulating water culture, which solves the problems in the prior art.

In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a bionic biological purification system for circulating water culture, which comprises

The treatment tank is used for carrying out water treatment; the treatment tank is enclosed into a water channel through a partition plate, and a biological treatment system is arranged in the water channel; a circulating pump group is arranged at one end of the water channel, and a filtering system is arranged at the other end of the water channel;

a culture pond for carrying out aquaculture;

the partition wall is arranged between the treatment tank and the culture tank, and an outlet of the circulating pump set penetrates through the partition wall and extends into the culture tank; an isolation net is detachably connected to the partition wall, and the isolation net is arranged corresponding to the filtering system.

Preferably, the circulating pump group comprises a sinking pit arranged at the bottom end of the treatment tank, and a first filter screen is fixedly arranged on the top surface of the sinking pit; the top fixed mounting of first filter screen has the protecting crust, be provided with the suction pump in the protecting crust, the water inlet of suction pump stretches into the bottom in sinking hole, the export of suction pump stretches out the protecting crust stretches into breed in the pond.

Preferably, the bottom end of the sinking pit is fixedly connected with an annular supporting wall, a plurality of communicating holes are formed in the supporting wall in a penetrating mode, and a second filter screen is embedded in each communicating hole; and a water inlet of the water suction pump is fixedly arranged in the inner cavity of the support wall.

Preferably, the filtering system comprises a filtering pit arranged at the bottom end of the treatment tank, and the filtering pit is arranged corresponding to the isolation net; a filtering basket is detachably connected in the filtering pit; and a filtering pile is fixedly arranged on one side of the filtering pit, which is far away from the isolation net, and the filtering pile is fixedly arranged on the side wall of the water channel.

Preferably, the filtering lifting basket comprises a basket body detachably connected in the filtering pit, and a basket cover is fixedly mounted at the top end of the basket body; the basket cover comprises a filter plate and a reinforcing plate which are fixedly connected, and the filter plate is arranged at one end far away from the isolation net; the top end of the basket cover is fixedly connected with a vertical plate, and the top end of the vertical plate is flush with the isolation net; and two side edges of the vertical plate are abutted against the side wall of the water channel.

Preferably, the basket body and the filter plate are both made of porous water-permeable pore plates; the porous water-permeable pore plate comprises two layers of porous plates which are arranged in parallel, and a filler made of a water-permeable material is filled between the two layers of porous plates.

Preferably, one side of the isolation net facing the culture pond is provided with a group of longitudinal guide rails, the guide rails are connected with a floating net in a sliding manner, and the width of the floating net is matched with that of the isolation net; and a circle of floats are fixedly connected to the top end of the floating net.

Preferably, the biological treatment system comprises a symbiotic animal system, a plant system and a microbial system; the animal system includes phytophagous animals and filter feeding animals, the plant system includes a variety of submerged plants and floating plants, and the microbial system includes a variety of algae, beneficial bacteria, and fungi.

The utility model discloses the following technical effects: the utility model discloses a bionic biological purification system for circulating water culture, which separates a treatment tank and a culture tank through a partition wall, wherein water circulates between the treatment tank and the culture tank, the treatment tank treats and purifies the water, then a circulating pump group guides the water into the culture tank for culture, the water in the culture tank enters the treatment tank from a separation net, enters a water channel for biological treatment and purification after being preliminarily filtered by a filter system, and is recycled, so that the water cannot be cultured due to pollution and nutrient enrichment, the water resource is greatly saved, high-pollution water cannot be discharged, the environment is protected, and clean production and sustainable development are facilitated; the water in the treatment tank is filtered by the filtering system and treated by the biological treatment system in the water channel, other toxic additives are not needed, and the biological treatment system is safe and environment-friendly, saves energy and does not harm aquatic products in the culture tank; the biological treatment system is formed by symbiosis of various organisms, the product is harmless, and the biological treatment system also contains substances beneficial to aquatic products in the culture pond, so that the growth speed of the aquatic products is accelerated, the quality is improved, the culture feed consumption can be reduced, the culture cost is reduced, and the culture benefit is improved. The utility model has compact structure, high speed for treating and purifying sewage, good treatment effect, internal circulation of sewage treatment, no need of frequently replacing internal water, little pollution to the outside, water resource saving and contribution to the propulsion of sustainable development; the sewage is biologically treated, so that the energy consumption is low, the treatment is thorough, the culture consumption can be reduced, the quality of aquatic products is improved, and the culture benefit is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a three-dimensional view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view showing the construction of the circulating pump group according to the present invention;

FIG. 5 is a schematic diagram of a filtration system according to the present invention;

FIG. 6 is a three-dimensional view of a filter lift of the present invention;

FIG. 7 is a schematic view of the filter plate structure of the present invention;

wherein, 1, a treatment pool; 2. a partition plate; 3. a water channel; 4. a biological treatment system; 5. a circulating pump group; 6. a filtration system; 7. a culture pond; 8. a partition wall; 9. an isolation net; 41. an animal system; 42. a plant system; 43. a microbial system; 51. sinking a pit; 52. a first filter screen; 53. a protective shell; 54. a water pump; 55. a support wall; 56. a second filter screen; 57. a three-way valve; 61. a filtration pit; 62. filtering the pile; 63. a basket body; 64. a filter plate; 65. a reinforcing plate; 66. a vertical plate; 67. a perforated plate; 68. a filler; 71. a feeding device; 72. an oxygen supply device; 91. a guide rail; 92. floating nets; 93. a float; 94. a clamping block; 95. a clamping groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to FIGS. 1-7, the present invention provides a biomimetic biological purification system for recirculating aquaculture, comprising

The treatment tank 1 is used for water treatment; the treatment tank 1 is enclosed into a water channel 3 by a partition plate 2, and a biological treatment system 4 is arranged in the water channel 3; one end of the water channel 3 is provided with a circulating pump group 5, and the other end of the water channel 3 is provided with a filtering system 6;

the culture pond 7 is used for carrying out aquaculture;

the partition wall 8 is arranged between the treatment tank 1 and the culture tank 7, and the outlet of the circulating pump set 5 penetrates through the partition wall 8 and extends into the culture tank 7; an isolation net 9 is detachably connected to the partition wall 8, and the isolation net 9 is arranged corresponding to the filtering system 6.

According to the utility model, the treatment tank 1 and the culture tank 7 are separated by the separation wall, water circulates between the treatment tank 1 and the culture tank 7, the treatment tank 1 treats and purifies the water, then the circulation pump unit 5 guides the water into the culture tank 7 for culture, the water in the culture tank 7 enters the treatment tank 1 from the separation net 9, enters the water channel 3 for biological treatment and purification after being primarily filtered by the filter system 6, the water is recycled, the water cannot be polluted and cultured due to nutrient enrichment, the water resource is greatly saved, high-pollution water cannot be discharged, the environment is protected, and clean production and sustainable development are facilitated; the water in the treatment tank 1 is filtered by the filtering system 6 and treated by the biological treatment system 4 in the water channel 3, and other toxic additives are not needed, so that the treatment tank is safe and environment-friendly, saves energy, and does not harm aquatic products in the culture tank 7; the biological treatment system 4 is formed by symbiosis of various organisms, the product is harmless, and the biological treatment system also contains substances beneficial to aquatic products in the culture pond 7, so that the growth speed of the aquatic products is accelerated, the quality is improved, the consumption of culture feed can be reduced, the culture cost is reduced, and the culture benefit is improved.

Furthermore, the water channel 3 is of a broken line type, so that the speed of water flow is reduced, and the treatment time is prolonged; the broken line type water channel 3 also prolongs the sewage purification length and has better treatment effect.

In a further optimized scheme, the circulating pump group 5 comprises a sinking pit 51 arranged at the bottom end of the treatment tank 1, and a first filter screen 52 is fixedly arranged on the top surface of the sinking pit 51; a protective shell 53 is fixedly installed at the top end of the first filter screen 52, a water suction pump 54 is arranged in the protective shell 53, a water inlet of the water suction pump 54 extends into the bottom end of the sinking pit 51, and an outlet of the water suction pump 54 extends out of the protective shell 53 and into the culture pond 7; an annular support wall 55 is fixedly connected to the bottom end of the pit 51, a plurality of communicating holes are formed in the support wall 55 in a penetrating mode, and a second filter screen 56 is embedded in each communicating hole; the water inlet of the water pump 54 is fixedly arranged in the inner cavity of the support wall 55. The water pump 54 is used for pumping the treated water into the culture pond 7; the water purified by the biological treatment system 4 enters the pit 51 from the first filter screen 52, enters the inner cavity of the support wall 55 through the second filter screen 56, and is pumped away by the water pump 54; the first and second sieves 52 and 56 are used for isolating aquatic animals and plants in the water course 3 from blocking by the water pump 54, and preventing organisms in the treatment tank 1 from entering the culture tank 7 to affect the growth of aquatic products in the culture tank 7.

Further, the second screen 56 has a smaller aperture than the first screen 52; the first filter screen 52 is detachable from the sink 51; the first screen 52 and the sump 51 are periodically cleaned.

Furthermore, a three-way valve 57 is arranged at the outlet of the water pump 54, the inlet of the three-way valve 57 is communicated with the water outlet of the water pump 54, and one of the two outlets of the three-way valve 57 is communicated with the culture pond 7 and is used for circularly treating water; the other is communicated with the outside of the treatment tank 1 and is used for changing water. The three-way valve 57 is prior art and will not be described herein.

According to a further optimized scheme, the filtering system 6 comprises a filtering pit 61 arranged at the bottom end of the treatment tank 1, and the filtering pit 61 is arranged corresponding to the isolation net 9; a filtering basket is detachably connected in the filtering pit 61; and a filter stack 62 is fixedly arranged on one side of the filter pit 61 far away from the separation net 9, and the filter stack 62 is fixedly arranged with the side wall of the water channel 3. The water surface in the culture pond 7 is flush with the water surface of the treatment pond 1, and when water in the treatment position is pumped into the culture pond 7 by the water pump 54, the water surface in the culture pond 7 rises and then enters the treatment pond 1 from the isolation net 9; the water in the culture pond 7 falls into the filtering basket in the filtering pit 61 after passing through the separation net 9, the aquatic organism excrement and the bait residue in the water are filtered by the filtering basket, the filtered water is subjected to secondary filtering by the filtering pile 62 and then enters the water channel 3, and biological treatment is started.

Furthermore, the filtering basket is detachably connected with the filtering pit 61, so that filtering materials in the filtering basket can be conveniently and regularly cleaned, blockage is prevented, and the filtering smoothness is ensured; meanwhile, the cleaned impurities can be used as nutrients of the biological treatment system 4 after being fermented.

Furthermore, the cross section of the filter stack 62 is a right trapezoid with a wide lower part and a narrow upper part, the inclined edge of the trapezoid faces the separation net 9, water filtered by the filter basket flows in from the inclined surface and flows out from the right-angle edge, and impurities filtered out are accumulated on the inclined edge, so that the filter stack is convenient to clean.

In a further optimized scheme, the filtering lifting basket comprises a basket body 63 detachably connected in the filtering pit 61, and a basket cover is fixedly arranged at the top end of the basket body 63; the basket cover comprises a filter plate 64 and a reinforcing plate 65 which are fixedly connected, and the filter plate 64 is arranged at one end far away from the isolation net 9; the top end of the basket cover is fixedly connected with a vertical plate 66, and the top end of the vertical plate 66 is flush with the isolation net 9; two side edges of the vertical plate 66 are abutted against the side wall of the water channel 3. The reinforcing plate 65 is used for ensuring the stability of the vertical plate 66; after passing through the isolation net 9, the water in the culture pond 7 impacts the vertical plate 66, so that the speed of the water flow is reduced; the decelerated water falls into the basket body 63, and after being filtered by the basket body 63 and the filter plate 64, impurities are left in the basket body 63, and the water flows to the filter stack 62, is filtered again and then flows into the water channel 3.

Furthermore, the basket body 63 and the basket cover can be detached, so that cleaning is convenient.

In a further optimized scheme, the basket body 63 and the filter plates 64 are both made of porous water-permeable pore plates; the porous and water-permeable pore plates comprise two layers of porous plates 67 arranged in parallel, and a filler 68 made of a water-permeable material is filled between the two layers of porous plates 67.

According to a further optimized scheme, one side of the isolation net 9, which faces the culture pond 7, is provided with a group of longitudinal guide rails 91, the guide rails 91 are connected with a floating net 92 in a sliding manner, and the width of the floating net 92 is matched with that of the isolation net 9; a circle of floats 93 are fixedly connected to the top ends of the floating nets 92. The floating algae will often grow in the culture pond 7, and the fallen leaves and other impurities will also exist, thus reducing the water quality in the culture pond 7 and influencing the growth of aquatic products. The floating net 92 can be lifted along the longitudinal direction of the isolation net 9, when floating algae and other impurities flow to the isolation net 9, the floating net 92 falls on the floating net 92, and the floating net 92 is periodically taken down for cleaning; the float 93 is disposed on the top of the floating net 92, and its buoyancy is matched with the floating net 92, so that the top surface of the floating net 92 is flush with the water surface, and can be lifted and lowered on the guide rail 91 with the rising and lowering of the water level, thereby automatically adjusting the height of the floating net 92.

Furthermore, clamping grooves 95 are formed in two side walls, contacting the isolation net 9 and the partition wall 8, of the partition wall 8, clamping blocks 94 matched with the clamping grooves 95 are arranged on the partition wall 8, the clamping grooves 95 are connected with the clamping blocks 94 in a sliding mode, the isolation net 9 is fixed, and the isolation net 9 can be conveniently detached.

In a further preferred embodiment, the biological treatment system 4 comprises a symbiotic animal system 41, a plant system 42 and a microbial system 43; the animal system 41 includes phytophagous and filter feeding animals, the plant system 42 includes various submerged and floating plants, and the microorganism system 43 includes various algae, beneficial bacteria and fungi. The animal system 41 comprises phytophagous animals and filter feeding animals, the phytophagous animals feed on aquatic plants to prevent the floating plants and submerged plants in the plant system 42 from growing excessively to cause the reduction of water treatment capacity, and the filter feeding animals are used for feeding floating algae in the water body and the microorganism system 43 to control the quantity of the floating algae and the microorganism system; the herbivorous animals comprise various herbivorous fishes, the filter feeding animals comprise various snails and clams, such as bivalve shellfish, and a plurality of heavy metals, domestic industrial sewage, biotoxin, bacteria, viruses and other harmful substances are enriched during the filter feeding process, so that the filtering effect is improved; meanwhile, a certain amount of carnivorous fishes and rotten fishes are put in the fish culture pond, and the number of the phytophagous animals and the filter feeding animals is controlled; the submerged plants and the floating plants are used for absorbing inorganic salt in the water body, reducing the content of the inorganic salt, preventing the water bloom phenomenon caused by the enrichment of N element and P element in the water body, also can carry out photosynthesis to supplement oxygen in the water body, and simultaneously provide sufficient food for phytophagous animals and filter feeding animals; the submerged plants include but are not limited to one or more of eel grass, reed, goldfish algae, hydrilla verticillata and watermifoil, and the floating plants include but are not limited to one or more of eichhornia crassipes and yellow croaker; microbial system 43 includes, but is not limited to, one or more of diatoms, green algae, chlorella, and brown algae, to supplement the function of plant system 42; beneficial bacteria and fungi including but not limited to light energy heterotrophic bacteria, light energy autotrophic bacteria and other beneficial bacteria improve the purification speed and purification effect of the water body; a portion of the anaerobic bacteria should also be included to break down dead animal and plant carcasses into inorganic matter for use by the plant system 42. The animal system 41, the plant system 42 and the microorganism system 43 form a complete symbiotic ecosystem, effectively treat sewage in the water channel 3, prevent the enrichment of N, P elements, control the pH value of water, and simultaneously prevent the unbalance caused by excessive growth of a certain part, and have good treatment effect and high purification speed.

Furthermore, vermiculite, pond sludge and other substances are paved at the bottom end of the water channel 3, so that an environment is provided for the growth of submerged plants, and a growth environment can also be provided for part of the animal system 41 and the microorganism system 43.

Furthermore, a braking feeding device 71 and a braking oxygen supply device 72 are arranged in the culture pond 7 and used for feeding aquatic products in the culture pond 7 at regular time and supplying oxygen at regular time, so that the labor intensity is reduced.

Furthermore, the bottom surface of the culture pond 7 has a certain inclination, and the position in butt joint with the isolation net 9 is the lowest point, so that bait residues and excrement in the culture pond 7 can conveniently flow into the treatment pond 1, and the water quality is prevented from being reduced due to accumulation at the bottom of the culture pond 7.

The using method comprises the following steps:

firstly, the culture pond 7 and the treatment pond 1 are built according to the field size and the calculation result.

Vermiculite and pond sludge are laid on the bottom surface of the water channel 3 and are fixed by using a cover net; planting selected submerged plants in the water channel 3, then injecting disinfected and exposed river water or pond water into the culture pond 7, enabling water flow to enter the filtering lifting basket from the isolation net 9, then flow out of the basket body 63 and the filter plate 64, flow into the water channel 3 after passing through the filter stack 62, and finally flow to the tail end of the water channel 3; the water discharge is continued until the water levels in the culture pond 7 and the treatment pond 1 reach a predetermined height.

Inoculating selected floating plants and microorganisms after the water in the treatment tank 1 is clear and settled, and finally putting selected animals; and (5) putting seedlings of aquatic products into the culture pond 7 to finish the arrangement of the whole system.

The water pump 54 is started, the water treated in the water channel 3 enters the inner cavity of the support wall 55 and is pumped into the culture pond 7 by the water pump 54, the water to be treated in the culture pond 7 enters the treatment pond 1 from the isolation net 9, and impurities such as floating algae and fallen leaves in the culture pond 7 are collected by the floating net 92; the water to be treated firstly enters a filtering basket, is primarily filtered and then secondarily filtered by a filtering pile 62, and the excrement and the bait residues of the aquatic products are left in the filtering basket; the filtered water enters the water channel 3, is treated and purified through the combined action of the animal system 41, the plant system 42 and the microorganism system 43, and is sent into the culture pond 7 through the water pump 54 to circulate in a reciprocating mode.

The culture pond 7 is periodically added with probiotics, and is periodically fed and supplied with oxygen.

The utility model has compact structure, high speed for treating and purifying sewage, good treatment effect, internal circulation of sewage treatment, no need of frequently replacing internal water, little pollution to the outside, water resource saving and contribution to the propulsion of sustainable development; the sewage is biologically treated, so that the energy consumption is low, the treatment is thorough, the culture consumption can be reduced, the quality of aquatic products is improved, and the culture benefit is greatly improved.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (8)

1. A bionical attitude biological purification system for recirculating aquaculture which characterized in that: comprises that

The treatment tank (1), the treatment tank (1) is used for water treatment; the treatment tank (1) is enclosed into a water channel (3) through a partition plate (2), and a biological treatment system (4) is arranged in the water channel (3); a circulating pump group (5) is arranged at one end of the water channel (3), and a filtering system (6) is arranged at the other end of the water channel (3);

a culture pond (7), wherein the culture pond (7) is used for aquaculture;

the partition wall (8) is arranged between the treatment tank (1) and the culture tank (7), and an outlet of the circulating pump set (5) penetrates through the partition wall (8) and extends into the culture tank (7); an isolation net (9) is detachably connected to the partition wall (8), and the isolation net (9) is arranged corresponding to the filtering system (6).

2. The biomimetic biological purification system for recirculating aquaculture as recited in claim 1, wherein: the circulating pump group (5) comprises a sinking pit (51) arranged at the bottom end of the treatment tank (1), and a first filter screen (52) is fixedly arranged on the top surface of the sinking pit (51); the top fixed mounting of first filter screen (52) has protecting crust (53), be provided with suction pump (54) in protecting crust (53), the water inlet of suction pump (54) stretches into the bottom of sinking pit (51), the export of suction pump (54) is stretched out protecting crust (53) and is stretched into breed in the pond (7).

3. The biomimetic biological purification system for recirculating aquaculture as recited in claim 2, wherein: an annular support wall (55) is fixedly connected to the bottom end of the sinking pit (51), a plurality of communicating holes are formed in the support wall (55) in a penetrating mode, and a second filter screen (56) is embedded in each communicating hole; and a water inlet of the water suction pump (54) is fixedly arranged in an inner cavity of the support wall (55).

4. The biomimetic biological purification system for recirculating aquaculture as recited in claim 1, wherein: the filtering system (6) comprises a filtering pit (61) arranged at the bottom end of the treatment tank (1), and the filtering pit (61) is arranged corresponding to the isolation net (9); a filtering basket is detachably connected in the filtering pit (61); and a filtering pile (62) is fixedly arranged on one side of the filtering pit (61) far away from the isolation net (9), and the filtering pile (62) is fixedly arranged with the side wall of the water channel (3).

5. The biomimetic biological purification system for recirculating aquaculture as recited in claim 4, wherein: the filtering lifting basket comprises a basket body (63) detachably connected in the filtering pit (61), and a basket cover is fixedly mounted at the top end of the basket body (63); the basket cover comprises a filter plate (64) and a reinforcing plate (65) which are fixedly connected, and the filter plate (64) is arranged at one end far away from the isolation net (9); the top end of the basket cover is fixedly connected with a vertical plate (66), and the top end of the vertical plate (66) is flush with the isolation net (9); two side edges of the vertical plate (66) are abutted against the side wall of the water channel (3).

6. The biomimetic biological purification system for recirculating aquaculture as recited in claim 5, wherein: the basket body (63) and the filter plate (64) are both made of porous water-permeable pore plates; the porous water-permeable pore plate comprises two layers of porous plates (67) which are arranged in parallel, and a filler (68) made of a water-permeable material is filled between the two layers of porous plates (67).

7. The biomimetic biological purification system for recirculating aquaculture as recited in claim 1, wherein: one side, facing the culture pond (7), of the isolation net (9) is provided with a group of longitudinal guide rails (91), a floating net (92) is connected onto the guide rails (91) in a sliding manner, and the width of the floating net (92) is matched with that of the isolation net (9); the top end of the floating net (92) is fixedly connected with a circle of floats (93).

8. The biomimetic biological purification system for recirculating aquaculture as recited in claim 1, wherein: the biological treatment system (4) comprises a symbiotic animal system (41), a plant system (42) and a microbial system (43); the animal system (41) comprises phytophagous and filter feeding animals, the plant system (42) comprises a plurality of submerged and floating plants, and the microbial system (43) comprises a plurality of algae, beneficial bacteria and fungi.

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