CN217377655U

CN217377655U - High-order pond culture tail water treatment circulation system

Info

Publication number: CN217377655U
Application number: CN202221279092.8U
Authority: CN
Inventors: 郭海燕; 周东磊; 谢勇; 胡重江
Original assignee: CHONGQING FISHERY SCIENCES RESEARCH INSTITUTE
Current assignee: CHONGQING FISHERY SCIENCES RESEARCH INSTITUTE
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-09-06
Anticipated expiration: 2032-05-25

Abstract

The utility model discloses a tail water treatment circulating system for high-level pond culture, which belongs to the field of aquaculture and comprises a high-level pond, a primary sewage collecting pond, a secondary sewage collecting pond, a micro-filter, a multi-stage treatment pond and a return water pond; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank; a first water pipe is arranged on the side wall of the first-stage sewage collecting tank; the first water pipe is connected with the bottom of the secondary sewage collecting tank; a second water pipe is arranged on the side wall of the secondary sewage collecting tank; a first water pump is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter; the outlet of the micro-filter is connected with the inlet of the multi-stage treatment tank; the outlet of the multi-stage treatment pool is communicated with the inlet of the water return pool; a third water pipe is arranged at the outlet of the water return pool; the third water pipe is connected with the elevated tank; and a second water pump and a water changing valve are arranged on the third water pipe. The utility model discloses a tail water treatment circulation system is bred in high-order pond, tail water treatment is effectual, can realize water resource cyclic utilization, can also plant the crop and improve economic benefits.

Description

High-order pond culture tail water treatment circulation system

Technical Field

The utility model belongs to the aquaculture field, specifically speaking relate to elevated tank aquaculture tail water treatment circulation system.

Background

The elevated pond culture mode is a new high-density intensive culture mode, can greatly improve culture density and yield compared with the traditional pond culture mode, but has obvious defects, and the feces and residual feed can seriously influence the water quality because the culture density is high and the feces amount and the fed feed of aquatic products such as fishes and shrimps are too much. The water quality control is the key of the technical core and success of the mode, so that the water needs to be changed frequently in the high-level pond, and the waste of water resources in the culture process is caused. The breeding tail water contains toxic and harmful substances such as ammonia nitrogen and nitrite, and the environment is polluted if the toxic and harmful substances are directly discharged, so that the tail water also needs to be treated. In addition, although the nitrate formed after decomposition of toxic substances is low in toxicity, the nitrate still affects the water quality and needs to be treated. At present, plants are planted beside a pool to absorb nitrate, but the plants cannot be converted into economic crops, and the benefit is low. There is a need in the art to improve upon the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned weak point provides high-order pond cultivation tail water treatment circulation system, and it is big to try to solve present high-order pond cultivation water waste, needs to handle the tail water, and tail water treatment method is single, plants the low scheduling problem of plant benefit. In order to achieve the above object, the utility model provides a following technical scheme:

the high-level pond culture tail water treatment circulating system comprises a high-level pond 1, a primary sewage collecting pond 2, a secondary sewage collecting pond 3, a micro-filter 4, a multi-stage treatment pond 5 and a water return pond 6; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank 1; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank 2; a first water pipe is arranged on the side wall of the primary sewage collecting tank 2; the first water pipe is connected with the bottom of the secondary sewage collecting tank 3; a second water pipe is arranged on the side wall of the secondary sewage collecting tank 3; a first water pump 7 is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter 4; the outlet of the micro-filter 4 is connected with the inlet of the multi-stage treatment pool 5; the outlet of the multistage treatment pool 5 is communicated with the inlet of the water return pool 6; a third water pipe is arranged at the outlet of the water return pool 6; the third water pipe is connected with the elevated tank 1; and a second water pump 8 and a water changing valve are arranged on the third water pipe. According to the structure, the elevated tank 1 is a pond for fish culture, is high in height and is convenient for water drainage and pollution discharge. In the culture process, the quantity of excrement of aquatic products such as fishes and shrimps is continuously increased, and the fed baits are not completely consumed, so that the excrement and sludge deposited by residual baits are generated at the bottom of the pond and need to be discharged. The bottom of the elevated tank 1 is provided with a drain pipe and a drain valve, the drain of sewage and sludge is controlled by the opening and closing of the drain valve, and the drain pipe is used for conveying the sewage and the sludge to the first-stage sewage collecting tank 2. The first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 both utilize gravitational potential energy to enable sludge to sink at the bottom of the tanks, and liquid floats above the tanks, so that the primary separation of the sludge and the sewage is realized. The micro-filter 4 is a mesh filter for intercepting fine suspended matters, and is used for removing the suspended matters in the sewage. The multi-stage treatment tank 5 can primarily purify the sewage by physical and biological means, wherein the physical means adopts precipitation and filtration to separate solid impurities in the sewage; since the feces of fish and the putrefactive food residues can also generate a plurality of toxic substances, such as ammonia nitrogen and various organic matters, which seriously affect the water quality, the multi-stage treatment tank 5 also utilizes a biological means, namely nitrobacteria, to convert the high-toxic substances, such as ammonia nitrogen, nitrite and the like, into inorganic substances, such as nitrate and the like, so as to reduce the toxicity of water and improve the water quality. The water return tank 6 is used for storing purified water and providing purified aquaculture water with qualified water quality for the high-level tank 1. The whole tail water treatment circulation flow is as follows: when the elevated tank 1 needs to drain sewage and sludge, the sewage valve is opened, and the sewage and the sludge are sent into the first-stage sewage collecting tank 2 through the sewage pipe. In addition, the bottom of the high-level pond 1 is also provided with an anti-escape net, so that cultured products such as fishes and shrimps can not be discharged. The height of the first-level sewage collecting tank 2 is designed to be lower than the bottom of the elevated tank 1, and the design utilizes the height difference to allow sludge to sink to the bottom of the tank due to the action of gravity. The upper portion of the lateral wall of the dirty pond 2 of one-level collection is equipped with first water pipe, and the dirty pond 2 of one-level collection flows into the dirty pond 3 bottoms of second grade collection through first water pipe through the sewage of sedimentation separation, and the dirty pond 3 of second grade collection utilizes the action of gravity to deposit the solid impurity in the aquatic once more, then the dirty pond 3 lateral wall upper portion of second grade collection second water pipe cooperation first water pump 7, with the dirty pond 3 interior sewage suction microstrainer 4 of second grade collection. The utility model discloses a microstrainer 4 adopts the BWL-7 microstrainer of the Baisite environmental protection equipment Limited company of the other city, and this is a rotary drum screen cloth filter equipment, is equipped with rotary drum and slag chute in, still is equipped with the screen cloth on the rotary drum, and the screen cloth aperture is very little, and the water discharge when holding back the suspended solid. The sewage pumped into the micro-filter 4 enters the rotary drum along the axial direction, flows through the screen in a radial shape under the condition that the rotary drum rotates continuously, and flows out from the lower part of the rotary drum, and fine suspended matters in the sewage are intercepted on the inner surface of the screen. When the impurities trapped on the filter screen are brought to the upper part by the rotating drum, the impurities are backflushed to the slag discharging groove by the pressure washing water and are discharged. The below of microstrainer 4 is 5 entrances in multistage treatment pond promptly, and sewage directly gets into multistage treatment pond 5 after flowing out from the rotary drum below, and sewage realizes the purification of quality of water through the physical precipitation, filtration and the biological treatment of multistage treatment pond 5, then, water flows into return water pond 6 from 5 exports in multistage treatment pond, and return water pond 6 is used for storing the water after purifying. The 6 exports in return water pond are equipped with the third water pipe of connecting high-order pond 1, be equipped with second water pump 8 on the third water pipe and trade the water valve, when high-order pond 1 need trade water, open and trade the water valve, and start second water pump 8, just can be with the water suction high-order pond 1 of return water pond 6, after high-order pond 1 water-logging is enough, close second water pump 8 and trade the water valve, the completion trades the water operation, and the blowdown valve of 1 bottom in high-order pond is in the closed condition at this in-process always. The utility model discloses can not only purify the tail water, can also change it into the breed water, realize the recycling of water resource.

Further, a fish and vegetable symbiotic system 9 is connected between the multistage treatment tank 5 and the water return tank 6. According to the structure, fish and vegetables are symbiotic, as the name suggests, fish ponds are arranged for fish culture and vegetable plants are planted in the same environment, and the mutual advantage relationship of the fish ponds and the vegetable plants is utilized to achieve the culture balance. A fish and vegetable symbiotic system 9 is arranged between the multi-stage treatment tank 5 and the water return tank 6, and is used for treating nitrate in water and purifying the water again. The fish and vegetable symbiotic system 9 generally comprises an upper layer and a lower layer, wherein the lower layer comprises a fish pond, a submerged water pump and a water pipe, wherein water and fish are contained in the fish pond; the upper layer comprises a planting bed and a siphon system, soil and stones for cultivating crops are arranged in the planting bed, and the crops are planted in the soil. The siphon system comprises a siphon housing and a drain pipe communicated with the upper layer and the lower layer. The siphon housing is arranged at the bottom of the planting bed, and the bottom of the siphon housing is provided with small holes, and the aperture of the small holes is smaller than the size of the stones. When the siphon cover is installed, stones are covered around the siphon cover, so that surrounding soil or foreign matters are prevented from entering a siphon system; the drain pipe is arranged inside the siphon housing and used for draining water. When the device works, water containing nitrate in the lower fish pond is pumped into the planting bed through the submerged pump, the nitrate is used as nutrient of plants and can be absorbed by the plants to supply the plants to grow, but the absorption capacity of the plants is limited, after the plants absorb required nutrient and partial moisture, the redundant water can permeate into the bottom of soil and then permeate into the cover through the small holes of the siphon outer cover to be accumulated, and when the accumulated water level in the siphon system is higher than the drain pipe in the cover, the water can flow back to the fish pond from the pipeline of the drain pipe. In the utility model, the water in the fish pond is primarily purified by the multistage treatment pond 5, contains nitrobacteria, and can decompose toxic substances such as ammonia nitrogen, nitrite and the like in the water in the fish pond into nitrate with low toxicity; then, the submerged water pump sends the water in the fish pond into the upper planting bed through a water pipe to irrigate the soil in the planting bed, so that crops planted in the soil can absorb water and nitrate to grow; the excess water permeates into the bottom of the soil, is collected by the siphon system and finally is drained back to the fishpond through a drain pipe arranged in the siphon system. Therefore, the fish-vegetable symbiotic system 9 is arranged, so that the nitrate can be absorbed by plants, the secondary purification of water is realized, economic crops such as vegetables can be planted in the aquaculture process, the economic benefit is improved, and multiple purposes are achieved.

Further, a tail water treatment wetland 10 is connected between the fish and vegetable symbiotic system 9 and the water return pool 6. According to the structure, the tail water treatment wetland 10 is arranged between the fish and vegetable symbiotic system 9 and the water return tank 6, and is used for retreating the water purified by the fish and vegetable symbiotic system 9, removing the nitrate possibly remaining in the water and ensuring the water quality. The tail water treatment wetland 10 comprises a water inlet pipe, a plurality of treatment tanks and a water outlet pipe, wherein the water inlet pipe is used for sending water flowing out from the fish-vegetable symbiotic system 9 into the treatment tanks, and the treatment tanks are arranged in series or in parallel and are used for accumulating water flow for purification; a plurality of plants are planted on the edge of each treatment pool, and the plants are usually selected from the species with high transplanting survival rate, strong pollution resistance and decontamination capability and good cold resistance so as to adapt to different climates. The plants absorb the nitrate remained in the water in the treatment tank as nutrients, so that the water quality in the treatment tank is improved, and the water quality purification effect is ensured. And finally, the purified water enters the water return pool 6 through a water outlet pipe.

Further, the multistage treatment tank 5 comprises a natural sedimentation tank 51, a cobblestone filter tank 52, a ceramsite filter tank 53, a biological brush aeration tank 54 and a biological treatment tank 55; the inlet of the multi-stage treatment tank 5 is arranged at the upper end of the natural sedimentation tank 51; a first water drainage tank communicated with the cobblestone filtering tank 52 is arranged on the side wall of the natural settling tank 51; the bottom of the cobblestone filter tank 52 is provided with a water permeable hole communicated with a ceramsite filter tank 53; a second water drainage groove communicated with the biological brush aeration tank 54 is formed in the side wall of the ceramsite filtering tank 53; a third water drainage tank communicated with the biological treatment tank 55 is arranged on the side wall of the biological brush aeration tank 54; the water outlet of the multi-stage treatment tank 5 is arranged on the side wall of the biological treatment tank 55. According to the structure, the multistage treatment tank 5 is provided with five treatment tanks which are sequentially communicated and are all used for purifying water. The natural settling tank 51 makes impurities in water sink to the bottom of the water by using gravitational potential energy. A plurality of cobbles are laid at the bottom of the cobble filtering pond 52, the cobbles are used for intercepting impurities, and water flow is filtered. A plurality of ceramsite filter materials are laid at the bottom of the ceramsite filter tank 53, and the ceramsite filter materials have the characteristics of rough surface and multiple micropores, so that sewage can be further filtered. Biological brush aeration tank 54 is equipped with the biological brush of a plurality of in the biological brush aeration tank 54, and biological brush hangs in the pond, closely puts in order, and the brush silk is all intercepted particulate matter and suspended material under the washing away of rivers, plays the filtering action. The bottom of the biological treatment pool 55 is provided with a plurality of biochemical balls, the sewage contains nitrobacteria, but the sewage is slow in reproduction, the attachment and growth speed of the nitrobacteria can be improved by the biochemical balls, and the nitrobacteria can carry out biological treatment on the ammonia nitrogen in the water, so that the nitrobacteria can be decomposed into inorganic matters with low toxicity, such as nitrate, and the like, and the toxicity of the water is reduced to improve the water quality. The 5 entrances of multi-stage treatment pond are established in natural sedimentation tank 51 top, and the sewage after micro-filter 4 filters directly falls into natural sedimentation tank 51 from the 4 bottoms of micro-filter, because rivers are slow in this pond, do not stir, and the solid impurity of aquatic can deposit to the bottom of the pool by oneself, makes sewage carry out preliminary sedimentation. After sedimentation, water flow in the natural sedimentation tank 51 enters the cobblestone filter tank 52 through a first water drainage tank arranged at the upper part of the side wall, and impurities are intercepted by a plurality of cobblestones at the bottom of the cobblestone filter tank 52; and because a large gap exists between the cobblestones, water flow is easy to pass through, and the filtering effect is achieved. The filtered water flows into a ceramsite filter tank 53 through a water permeable hole arranged at the bottom of the cobblestone filter tank 52. And a plurality of ceramsite filter materials are paved in the ceramsite filter tank 53, so that impurities in the sewage are further filtered. Then the water flow enters a biological brush aeration tank 54 through a second water drainage groove arranged at the top of the side wall of the ceramsite filter tank 53, a plurality of biological brushes in the biological brush aeration tank 54 intercept particulate matters and suspended matters, and impurities in the water are further removed, so that the water flow enters a biological treatment tank 55 through a third water drainage groove arranged at the top of the side wall of the biological brush aeration tank 54. The biochemical balls in the biological treatment tank 55 facilitate the attachment of nitrifying bacteria in water and accelerate the growth of the nitrifying bacteria, so that enough nitrifying bacteria can be cultured in the biological treatment tank, ammonia nitrogen in the water is firstly decomposed into nitrite and then decomposed into nitrate, the toxicity of the water is reduced, and the water flow containing the nitrifying bacteria flows out of an outlet of the biological treatment tank 55 and then enters the fish-vegetable symbiotic system 9 for further purification.

Further, a water quality monitor, a drain valve and a controller are also arranged in the tail water treatment wetland 10; the water quality monitor is arranged in the tail water treatment wetland 10 and is used for monitoring the water quality condition; the drain valve is arranged at the water outlet of the tail water treatment wetland 10; the water quality monitor and the drain valve are electrically connected with the controller. From the above structure, the tail water treatment wetland 10 performs water purification by absorbing the nitrate remained in the water by the plants at the pond side, and the water quality detector is used for detecting whether the water quality of the tail water treatment wetland 10 reaches the standard of recycling. If the water quality reaches the standard, the water quality detector transmits a signal to the controller, and the controller controls a drain valve arranged on a water outlet pipeline of the tail water treatment wetland 10 to be opened so that the water of the tail water treatment wetland 10 flows into the water return tank 6; if the water quality does not reach the standard, the drain valve is closed, and the water is left in the tail water treatment wetland 10 for continuous treatment.

Further, the bottoms of the first-stage sewage collecting tank 2, the second-stage sewage collecting tank 3 and the micro-filter 4 are also connected with a solid residue collector through pipelines. According to the structure, the sludge at the bottoms of the first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 and the solid impurities separated by the micro-filter 4 are all discharged into the solid residue collector through the pipeline, and the solid impurities are regularly cleaned by workers.

The utility model has the advantages that:

the utility model discloses a tail water treatment circulating system for high-level pond culture, which belongs to the field of aquaculture and comprises a high-level pond, a primary sewage collecting pond, a secondary sewage collecting pond, a micro-filter, a multi-stage treatment pond and a return water pond; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank; a first water pipe is arranged on the side wall of the first-stage sewage collecting tank; the first water pipe is connected with the bottom of the secondary sewage collecting tank; a second water pipe is arranged on the side wall of the secondary sewage collecting tank; a first water pump is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter; the outlet of the micro-filter is connected with the inlet of the multi-stage treatment tank; the outlet of the multi-stage treatment tank is communicated with the inlet of the water return tank; a third water pipe is arranged at the outlet of the water return pool; the third water pipe is connected with the elevated tank; and a second water pump and a water changing valve are arranged on the third water pipe. The utility model discloses a tail water treatment circulation system is bred in high-order pond, tail water treatment is effectual, can realize water resource cyclic utilization, can also plant the crop and improve economic benefits.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the drawings: 1-elevated tank, 2-first-stage sewage collecting tank, 3-second-stage sewage collecting tank, 4-microfilter, 5-multistage treatment tank, 6-backwater tank, 7-first water pump, 8-second water pump, 9-fish-vegetable symbiotic system, 10-tail water treatment wetland, 51-natural sedimentation tank, 52-cobble filtering tank, 53-ceramsite filtering tank, 54-biological brush aeration tank and 55-biological treatment tank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

The first embodiment is as follows:

see figure 1. The high-level pond culture tail water treatment circulating system comprises a high-level pond 1, a first-stage sewage collecting pond 2, a second-stage sewage collecting pond 3, a micro-filter 4, a multi-stage treatment pond 5 and a water returning pond 6; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank 1; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank 2; a first water pipe is arranged on the side wall of the primary sewage collecting tank 2; the first water pipe is connected with the bottom of the secondary sewage collecting tank 3; a second water pipe is arranged on the side wall of the secondary sewage collecting tank 3; a first water pump 7 is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter 4; the outlet of the micro-filter 4 is connected with the inlet of the multi-stage treatment pool 5; the outlet of the multistage treatment pool 5 is communicated with the inlet of the water return pool 6; a third water pipe is arranged at the outlet of the water return pool 6; the third water pipe is connected with the elevated tank 1; and a second water pump 8 and a water changing valve are arranged on the third water pipe. According to the structure, the elevated tank 1 is a pond for fish culture, is high in height and is convenient for water drainage and pollution discharge. In the process of cultivation, the quantity of excrement of aquatic products such as fishes and shrimps is continuously increased, and the fed baits are not completely consumed, so that excrement and sludge deposited by residual baits are generated at the bottom of the pond and need to be discharged. The bottom of the elevated tank 1 is provided with a drain pipe and a drain valve, the drain of sewage and sludge is controlled by the opening and closing of the drain valve, and the drain pipe is used for conveying the sewage and the sludge to the first-stage sewage collecting tank 2. The first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 both utilize gravitational potential energy to enable sludge to sink at the bottom of the tanks, and liquid floats above the tanks, so that the primary separation of the sludge and the sewage is realized. The micro-filter 4 is a mesh filter for intercepting fine suspended matters, and is used for removing the suspended matters in the sewage. The multi-stage treatment tank 5 can primarily purify the sewage by physical and biological means, wherein the physical means adopts precipitation and filtration to separate solid impurities in the sewage; since the feces of fish and the putrefactive food residues can also generate a plurality of toxic substances, such as ammonia nitrogen and various organic matters, which seriously affect the water quality, the multi-stage treatment tank 5 also utilizes a biological means, namely nitrobacteria, to convert the high-toxic substances, such as ammonia nitrogen, nitrite and the like, into inorganic substances, such as nitrate and the like, so as to reduce the toxicity of water and improve the water quality. The water return tank 6 is used for storing purified water and providing purified aquaculture water with qualified water quality for the high-level tank 1. The whole tail water treatment circulation flow is as follows: when sewage and sludge need to be drained away from the elevated tank 1, the sewage discharge valve is opened, and the sewage and the sludge are sent into the first-stage sewage collecting tank 2 through the sewage discharge pipe. In addition, the bottom of the elevated tank 1 is also provided with an anti-escape net, so that the cultured products such as fish, shrimp and the like can not be discharged. The height of the first-level sewage collecting tank 2 is designed to be lower than the bottom of the elevated tank 1, and the design utilizes the height difference to allow sludge to sink to the bottom of the tank due to the action of gravity. The upper portion of the lateral wall of the dirty pond 2 of one-level collection is equipped with first water pipe, and the dirty pond 2 of one-level collection flows into the dirty pond 3 bottoms of second grade collection through first water pipe through the sewage of sedimentation separation, and the dirty pond 3 of second grade collection utilizes the action of gravity to deposit the solid impurity in the aquatic once more, then the dirty pond 3 lateral wall upper portion of second grade collection second water pipe cooperation first water pump 7, with the dirty pond 3 interior sewage suction microstrainer 4 of second grade collection. The utility model discloses a microstrainer 4 adopts the BWL-7 microstrainer of the Baisite environmental protection equipment Limited company of the other city, and this is a rotary drum screen cloth filter equipment, is equipped with rotary drum and slag chute in, still is equipped with the screen cloth on the rotary drum, and the screen cloth aperture is very little, and the water discharge when holding back the suspended solid. The sewage pumped into the micro-filter 4 enters the rotary drum along the axial direction, flows through the screen in a radial shape under the condition that the rotary drum rotates continuously, and flows out from the lower part of the rotary drum, and fine suspended matters in the sewage are intercepted on the inner surface of the screen. When the impurities trapped on the filter screen are brought to the upper part by the rotating drum, the impurities are backflushed to the slag discharging groove by the pressure washing water and are discharged. The below of microstrainer 4 is 5 entrances in multistage treatment pond promptly, and sewage directly gets into multistage treatment pond 5 after flowing out from the rotary drum below, and sewage realizes the purification of quality of water through the physical precipitation, filtration and the biological treatment of multistage treatment pond 5, then, water flows into return water pond 6 from 5 exports in multistage treatment pond, and return water pond 6 is used for storing the water after purifying. The 6 exports in return water pond are equipped with the third water pipe of connecting high-order pond 1, be equipped with second water pump 8 on the third water pipe and trade the water valve, when high-order pond 1 need trade water, open and trade the water valve, and start second water pump 8, just can be with the water suction high-order pond 1 of return water pond 6, after high-order pond 1 water-logging is enough, close second water pump 8 and trade the water valve, the completion trades the water operation, and the blowdown valve of 1 bottom in high-order pond is in the closed condition at this in-process always. The utility model discloses can not only purify the tail water, can also change it into the breed water, realize the recycling of water resource.

Example two:

see figure 1. The high-level pond culture tail water treatment circulating system comprises a high-level pond 1, a first-stage sewage collecting pond 2, a second-stage sewage collecting pond 3, a micro-filter 4, a multi-stage treatment pond 5 and a water returning pond 6; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank 1; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank 2; a first water pipe is arranged on the side wall of the primary sewage collecting tank 2; the first water pipe is connected with the bottom of the secondary sewage collecting tank 3; a second water pipe is arranged on the side wall of the secondary sewage collecting tank 3; a first water pump 7 is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter 4; the outlet of the micro-filter 4 is connected with the inlet of the multi-stage treatment pool 5; an outlet of the multi-stage treatment tank 5 is communicated with an inlet of the water return tank 6; a third water pipe is arranged at the outlet of the water return pool 6; the third water pipe is connected with the elevated tank 1; and a second water pump 8 and a water changing valve are arranged on the third water pipe. According to the structure, the elevated tank 1 is a pond for fish culture, is high in height and is convenient for water drainage and pollution discharge. In the culture process, the quantity of excrement of aquatic products such as fishes and shrimps is continuously increased, and the fed baits are not completely consumed, so that the excrement and sludge deposited by residual baits are generated at the bottom of the pond and need to be discharged. The bottom of the elevated tank 1 is provided with a drain pipe and a drain valve, the drain of sewage and sludge is controlled by the opening and closing of the drain valve, and the drain pipe is used for conveying the sewage and the sludge to the first-stage sewage collecting tank 2. The first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 both utilize gravitational potential energy to enable sludge to sink at the bottom of the tanks, and liquid floats above the tanks, so that the primary separation of the sludge and the sewage is realized. The micro-filter 4 is a mesh filter for intercepting fine suspended matters, and is used for removing the suspended matters in the sewage. The multi-stage treatment tank 5 can primarily purify the sewage by physical and biological means, wherein the physical means adopts precipitation and filtration to separate solid impurities in the sewage; since the feces of fish and the putrefactive food residues can also generate a plurality of toxic substances, such as ammonia nitrogen and various organic matters, which seriously affect the water quality, the multi-stage treatment tank 5 also utilizes a biological means, namely nitrobacteria, to convert the high-toxic substances, such as ammonia nitrogen, nitrite and the like, into inorganic substances, such as nitrate and the like, so as to reduce the toxicity of water and improve the water quality. The water return tank 6 is used for storing purified water and providing purified culture water with qualified water quality for the high-level tank 1. The whole tail water treatment circulation flow is as follows: when the elevated tank 1 needs to drain sewage and sludge, the sewage valve is opened, and the sewage and the sludge are sent into the first-stage sewage collecting tank 2 through the sewage pipe. In addition, the bottom of the high-level pond 1 is also provided with an anti-escape net, so that cultured products such as fishes and shrimps can not be discharged. The height of the first-level sewage collecting tank 2 is designed to be lower than the bottom of the elevated tank 1, and the design utilizes the height difference to allow sludge to sink to the bottom of the tank due to the action of gravity. The upper portion of the lateral wall of the dirty pond 2 of one-level collection is equipped with first water pipe, and the dirty pond 2 of one-level collection flows into the dirty pond 3 bottoms of second grade collection through first water pipe through the sewage of sedimentation separation, and the dirty pond 3 of second grade collection utilizes the action of gravity to deposit the solid impurity in the aquatic once more, then the dirty pond 3 lateral wall upper portion of second grade collection second water pipe cooperation first water pump 7, with the dirty pond 3 interior sewage suction microstrainer 4 of second grade collection. The utility model discloses a microstrainer 4 adopts the BWL-7 microstrainer of the Baisite environmental protection equipment Limited company of the other city, and this is a rotary drum screen cloth filter equipment, is equipped with rotary drum and slag chute in, still is equipped with the screen cloth on the rotary drum, and the screen cloth aperture is very little, and the water discharge when holding back the suspended solid. The sewage pumped into the micro-filter 4 enters the rotary drum along the axial direction, flows through the screen in a radial shape under the condition that the rotary drum rotates continuously, and flows out from the lower part of the rotary drum, and fine suspended matters in the sewage are intercepted on the inner surface of the screen. When the impurities trapped on the filter screen are brought to the upper part by the rotating drum, the impurities are backflushed to the slag discharging groove by the pressure washing water and are discharged. The below of microstrainer 4 is 5 entrances in the multistage treatment pond promptly, and sewage directly gets into multistage treatment pond 5 after flowing out from the rotary drum below, and sewage passes through the physical precipitation of multistage treatment pond 5, filters and biological treatment, realizes the purification of quality of water, then, water flows into return water pond 6 from 5 exports in the multistage treatment pond, and return water pond 6 is used for storing the water after purifying. 6 exports in return water pond are equipped with the third water pipe of connecting elevated tank 1, be equipped with second water pump 8 on the third water pipe and trade the water valve, when elevated tank 1 needs to trade water, open and trade the water valve, and start second water pump 8, just can be with the water suction elevated tank 1 of return water pond 6, after 1 water-logging in elevated tank is enough, close second water pump 8 and trade the water valve, the completion is traded the water operation, and the blowdown valve of 1 bottom in elevated tank is in closed condition at this in-process always. The utility model discloses can not only purify the tail water, can also change it into the breed water, realize the recycling of water resource.

And a fish and vegetable symbiotic system 9 is also connected between the multistage treatment tank 5 and the water return tank 6. According to the structure, fish and vegetables are symbiotic, as the name suggests, fish ponds are arranged for fish culture and vegetable plants are planted in the same environment, and the mutual advantage relationship of the fish ponds and the vegetable plants is utilized to achieve the culture balance. A fish-vegetable symbiotic system 9 is arranged between the multi-stage treatment tank 5 and the water return tank 6 and is used for treating nitrate in water and repurifying the water. The fish and vegetable symbiotic system 9 generally comprises an upper layer and a lower layer, wherein the lower layer comprises a fish pond, a submerged water pump and a water pipe, wherein water and fish are contained in the fish pond; the upper layer comprises a planting bed and a siphon system, soil and stones for cultivating crops are arranged in the planting bed, and the crops are planted in the soil. The siphon system comprises a siphon housing and a drain pipe communicated with the upper layer and the lower layer. The siphon housing is arranged at the bottom of the planting bed, and the bottom of the siphon housing is provided with a small hole, and the aperture of the small hole is smaller than the size of the pebble. When the siphon cover is installed, stones are covered around the siphon cover, so that surrounding soil or foreign matters are prevented from entering a siphon system; the drain pipe is arranged inside the siphon housing and used for draining water. When the device works, water containing nitrate in the lower fish pond is pumped into the planting bed through the submerged pump, the nitrate is used as nutrient of plants and can be absorbed by the plants to supply the plants to grow, but the absorption capacity of the plants is limited, after the plants absorb required nutrient and partial moisture, the redundant water can permeate into the bottom of soil and then permeate into the cover through the small holes of the siphon outer cover to be accumulated, and when the accumulated water level in the siphon system is higher than the drain pipe in the cover, the water can flow back to the fish pond from the pipeline of the drain pipe. In the utility model, the water in the fish pond is primarily purified by the multistage treatment pond 5, contains nitrobacteria, and can decompose toxic substances such as ammonia nitrogen, nitrite and the like in the water in the fish pond into nitrate with low toxicity; then, the submerged water pump sends the water in the fish pond into the upper planting bed through a water pipe to irrigate the soil in the planting bed, so that crops planted in the soil can absorb water and nitrate to grow; the excess water permeates into the bottom of the soil, is collected by the siphon system and finally is drained back to the fishpond through a drain pipe arranged in the siphon system. Therefore, the fish-vegetable symbiotic system 9 is arranged, so that the nitrate can be absorbed by plants, the secondary purification of water is realized, economic crops such as vegetables can be planted in the aquaculture process, the economic benefit is improved, and multiple purposes are achieved.

And a tail water treatment wetland 10 is also connected between the fish and vegetable symbiotic system 9 and the water return tank 6. According to the structure, the tail water treatment wetland 10 is arranged between the fish and vegetable symbiotic system 9 and the water return tank 6, and is used for retreating the water purified by the fish and vegetable symbiotic system 9, removing the nitrate possibly remaining in the water and ensuring the water quality. The tail water treatment wetland 10 comprises a water inlet pipe, a plurality of treatment tanks and a water outlet pipe, wherein the water inlet pipe is used for sending water flowing out from the fish-vegetable symbiotic system 9 into the treatment tanks, and the treatment tanks are arranged in series or in parallel and are used for accumulating water flow for purification; a plurality of plants are planted on the edge of each treatment pool, and the plants are usually selected from the species with high transplanting survival rate, strong pollution resistance and decontamination capability and good cold resistance so as to adapt to different climates. The plants absorb the nitrate remained in the water in the treatment tank as nutrients, so that the water quality in the treatment tank is improved, and the water quality purification effect is ensured. And finally, the purified water enters the water return pool 6 through a water outlet pipe.

Example three:

see figure 1. The high-level pond culture tail water treatment circulating system comprises a high-level pond 1, a primary sewage collecting pond 2, a secondary sewage collecting pond 3, a micro-filter 4, a multi-stage treatment pond 5 and a water return pond 6; a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank 1; the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank 2; a first water pipe is arranged on the side wall of the primary sewage collecting tank 2; the first water pipe is connected with the bottom of the secondary sewage collecting tank 3; a second water pipe is arranged on the side wall of the secondary sewage collecting tank 3; a first water pump 7 is arranged on the second water pipe; the second water pipe is connected with the inlet of the micro-filter 4; the outlet of the micro-filter 4 is connected with the inlet of the multi-stage treatment pool 5; the outlet of the multistage treatment pool 5 is communicated with the inlet of the water return pool 6; a third water pipe is arranged at the outlet of the water return pool 6; the third water pipe is connected with the elevated tank 1; and a second water pump 8 and a water changing valve are arranged on the third water pipe. According to the structure, the elevated tank 1 is a pond for fish culture, is high in height and is convenient for water drainage and pollution discharge. In the culture process, the quantity of excrement of aquatic products such as fishes and shrimps is continuously increased, and the fed baits are not completely consumed, so that the excrement and sludge deposited by residual baits are generated at the bottom of the pond and need to be discharged. The bottom of the elevated tank 1 is provided with a drain pipe and a drain valve, the drain of sewage and sludge is controlled by the opening and closing of the drain valve, and the drain pipe is used for conveying the sewage and the sludge to the first-stage sewage collecting tank 2. The first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 both utilize gravitational potential energy to enable sludge to sink at the bottom of the tanks, and liquid floats above the tanks, so that the primary separation of the sludge and the sewage is realized. The micro-filter 4 is a mesh filter for intercepting fine suspended matters, and is used for removing the suspended matters in the sewage. The multi-stage treatment tank 5 can primarily purify the sewage by physical and biological means, wherein the physical means adopts precipitation and filtration to separate solid impurities in the sewage; since the feces of fish and the putrefactive food residues can also generate a plurality of toxic substances, such as ammonia nitrogen and various organic matters, which seriously affect the water quality, the multi-stage treatment tank 5 also utilizes a biological means, namely nitrobacteria, to convert the high-toxic substances, such as ammonia nitrogen, nitrite and the like, into inorganic substances, such as nitrate and the like, so as to reduce the toxicity of water and improve the water quality. The water return tank 6 is used for storing purified water and providing purified aquaculture water with qualified water quality for the high-level tank 1. The whole tail water treatment circulation flow is as follows: when the elevated tank 1 needs to drain sewage and sludge, the sewage valve is opened, and the sewage and the sludge are sent into the first-stage sewage collecting tank 2 through the sewage pipe. In addition, the bottom of the high-level pond 1 is also provided with an anti-escape net, so that cultured products such as fishes and shrimps can not be discharged. The height of the first-level sewage collecting tank 2 is designed to be lower than the bottom of the elevated tank 1, and the design utilizes the height difference to allow sludge to sink to the bottom of the tank due to the action of gravity. The upper portion of the lateral wall of the dirty pond 2 of one-level collection is equipped with first water pipe, and the dirty pond 2 of one-level collection flows into the dirty pond 3 bottoms of second grade collection through first water pipe through the sewage of sedimentation separation, and the dirty pond 3 of second grade collection utilizes the action of gravity to deposit the solid impurity in the aquatic once more, then the dirty pond 3 lateral wall upper portion of second grade collection second water pipe cooperation first water pump 7, with the dirty pond 3 interior sewage suction microstrainer 4 of second grade collection. The utility model discloses a microstrainer 4 adopts the BWL-7 microstrainer of the Baisite environmental protection equipment Limited company of the other city, and this is a rotary drum screen cloth filter equipment, is equipped with rotary drum and slag chute in, still is equipped with the screen cloth on the rotary drum, and the screen cloth aperture is very little, and the water discharge when holding back the suspended solid. The sewage pumped into the micro-filter 4 enters the rotary drum along the axial direction, flows through the screen in a radial shape under the condition that the rotary drum rotates continuously, and flows out from the lower part of the rotary drum, and fine suspended matters in the sewage are intercepted on the inner surface of the screen. When the impurities trapped on the filter screen are brought to the upper part by the rotating drum, the impurities are backflushed to the slag discharging groove by the pressure washing water and are discharged. The below of microstrainer 4 is 5 entrances in multistage treatment pond promptly, and sewage directly gets into multistage treatment pond 5 after flowing out from the rotary drum below, and sewage realizes the purification of quality of water through the physical precipitation, filtration and the biological treatment of multistage treatment pond 5, then, water flows into return water pond 6 from 5 exports in multistage treatment pond, and return water pond 6 is used for storing the water after purifying. The 6 exports in return water pond are equipped with the third water pipe of connecting high-order pond 1, be equipped with second water pump 8 on the third water pipe and trade the water valve, when high-order pond 1 need trade water, open and trade the water valve, and start second water pump 8, just can be with the water suction high-order pond 1 of return water pond 6, after high-order pond 1 water-logging is enough, close second water pump 8 and trade the water valve, the completion trades the water operation, and the blowdown valve of 1 bottom in high-order pond is in the closed condition at this in-process always. The utility model discloses can not only purify the tail water, can also change it into the breed water, realize the recycling of water resource.

And a fish and vegetable symbiotic system 9 is also connected between the multistage treatment tank 5 and the water return tank 6. According to the structure, fish and vegetables are symbiotic, as the name suggests, fish ponds are arranged for fish culture and vegetable plants are planted in the same environment, and the mutual advantage relationship of the fish ponds and the vegetable plants is utilized to achieve the culture balance. A fish and vegetable symbiotic system 9 is arranged between the multi-stage treatment tank 5 and the water return tank 6, and is used for treating nitrate in water and purifying the water again. The fish and vegetable symbiotic system 9 generally comprises an upper layer and a lower layer, wherein the lower layer comprises a fish pond, a submerged water pump and a water pipe, wherein water and fish are contained in the fish pond; the upper layer comprises a planting bed and a siphon system, soil and stones for cultivating crops are arranged in the planting bed, and the crops are planted in the soil. The siphon system comprises a siphon housing and a drain pipe communicated with the upper layer and the lower layer. The siphon housing is arranged at the bottom of the planting bed, and the bottom of the siphon housing is provided with a small hole, and the aperture of the small hole is smaller than the size of the pebble. When the siphon cover is installed, stones are covered around the siphon cover, so that surrounding soil or foreign matters are prevented from entering a siphon system; the drain pipe is arranged inside the siphon housing and used for draining water. When the device works, water containing nitrate in the lower fish pond is pumped into the planting bed through the submerged pump, the nitrate is used as nutrient of plants and can be absorbed by the plants to supply the plants to grow, but the absorption capacity of the plants is limited, after the plants absorb required nutrient and partial moisture, the redundant water can permeate into the bottom of soil and then permeate into the cover through the small holes of the siphon outer cover to be accumulated, and when the accumulated water level in the siphon system is higher than the drain pipe in the cover, the water can flow back to the fish pond from the pipeline of the drain pipe. In the utility model, the water in the fish pond is primarily purified by the multistage treatment pond 5, contains nitrobacteria, and can decompose toxic substances such as ammonia nitrogen, nitrite and the like in the water in the fish pond into nitrate with low toxicity; then, the submerged water pump sends the water in the fish pond into the upper planting bed through a water pipe to irrigate the soil in the planting bed, so that crops planted in the soil can absorb water and nitrate to grow; the excess water permeates into the bottom of the soil, is collected by the siphon system and finally is drained back to the fishpond through a drain pipe arranged in the siphon system. Therefore, the fish-vegetable symbiotic system 9 is arranged, so that the nitrate can be absorbed by plants, the secondary purification of water is realized, economic crops such as vegetables and the like can be planted in the aquaculture process, the economic benefit is improved, and multiple purposes are achieved.

The multistage treatment tank 5 comprises a natural sedimentation tank 51, a cobblestone filter tank 52, a ceramsite filter tank 53, a biological brush aeration tank 54 and a biological treatment tank 55; the inlet of the multi-stage treatment tank 5 is arranged at the upper end of the natural sedimentation tank 51; a first water drainage tank communicated with the cobblestone filter tank 52 is arranged on the side wall of the natural sedimentation tank 51; the bottom of the cobblestone filter tank 52 is provided with a water permeable hole communicated with a ceramsite filter tank 53; the side wall of the ceramsite filter tank 53 is provided with a second water drainage tank communicated with the biological brush aeration tank 54; a third water drainage tank communicated with the biological treatment tank 55 is arranged on the side wall of the biological brush aeration tank 54; the water outlet of the multi-stage treatment tank 5 is arranged on the side wall of the biological treatment tank 55. According to the structure, the multistage treatment tank 5 is provided with five treatment tanks which are sequentially communicated and are all used for purifying water. The natural settling tank 51 makes impurities in water sink to the bottom of the water by using gravitational potential energy. A plurality of cobbles are laid at the bottom of the cobble filtering pond 52, the cobbles are used for intercepting impurities, and water flow is filtered. A plurality of ceramsite filter materials are laid at the bottom of the ceramsite filter tank 53, and the ceramsite filter materials have the characteristics of rough surface and multiple micropores, so that sewage can be further filtered. Biological brush aeration tank 54 is equipped with the biological brush of a plurality of in the biological brush aeration tank 54, and biological brush hangs in the pond, closely puts in order, and the brush silk is all intercepted particulate matter and suspended material under the washing away of rivers, plays the filtering action. The bottom of the biological treatment pool 55 is provided with a plurality of biochemical balls, the sewage contains nitrobacteria, but the sewage is slow in reproduction, the attachment and growth speed of the nitrobacteria can be improved by the biochemical balls, and the nitrobacteria can carry out biological treatment on the ammonia nitrogen in the water, so that the nitrobacteria can be decomposed into inorganic matters with low toxicity, such as nitrate, and the like, and the toxicity of the water is reduced to improve the water quality. The 5 entrances of multi-stage treatment pond are established in natural sedimentation tank 51 top, and the sewage after micro-filter 4 filters directly falls into natural sedimentation tank 51 from the 4 bottoms of micro-filter, because rivers are slow in this pond, do not stir, and the solid impurity of aquatic can deposit to the bottom of the pool by oneself, makes sewage carry out preliminary sedimentation. After sedimentation, water flow in the natural sedimentation tank 51 enters the cobblestone filter tank 52 through a first water drainage tank arranged at the upper part of the side wall, and impurities are intercepted by a plurality of cobblestones at the bottom of the cobblestone filter tank 52; and because a large gap exists between the cobblestones, water flow is easy to pass through, and the filtering effect is achieved. The filtered water flows into a ceramsite filter tank 53 through a water permeable hole arranged at the bottom of the cobblestone filter tank 52. And a plurality of ceramsite filter materials are paved in the ceramsite filter tank 53, so that impurities in the sewage are further filtered. Then the water flow enters the biological brush aeration tank 54 through a second water drainage groove arranged on the top of the side wall of the ceramsite filtering tank 53, a plurality of biological brushes in the biological brush aeration tank 54 intercept particulate matters and suspended matters, and impurities in the water are further removed, so that the water flow enters the biological treatment tank 55 through a third water drainage groove arranged on the top of the side wall of the biological brush aeration tank 54. The biochemical balls in the biological treatment tank 55 facilitate the attachment of nitrifying bacteria in water and accelerate the growth of the nitrifying bacteria, so that enough nitrifying bacteria can be cultured in the biological treatment tank, ammonia nitrogen in the water is firstly decomposed into nitrite and then decomposed into nitrate, the toxicity of the water is reduced, and the water flow containing the nitrifying bacteria flows out of an outlet of the biological treatment tank 55 and then enters the fish-vegetable symbiotic system 9 for further purification.

A water quality monitor, a drain valve and a controller are also arranged in the tail water treatment wetland 10; the water quality monitor is arranged in the tail water treatment wetland 10 and is used for monitoring the water quality condition; the drain valve is arranged at the water outlet of the tail water treatment wetland 10; the water quality monitor and the drain valve are electrically connected with the controller. From the above structure, the tail water treatment wetland 10 performs water purification by absorbing the nitrate remained in the water by the plants at the pond side, and the water quality detector is used for detecting whether the water quality of the tail water treatment wetland 10 reaches the standard of recycling. If the water quality reaches the standard, the water quality detector transmits a signal to the controller, and the controller controls a drain valve arranged on a water outlet pipeline of the tail water treatment wetland 10 to be opened, so that the water of the tail water treatment wetland 10 flows into the water return tank 6; if the water quality does not reach the standard, the drain valve is closed, and the water is left in the tail water treatment wetland 10 for continuous treatment.

The bottoms of the first-stage sewage collecting tank 2, the second-stage sewage collecting tank 3 and the micro-filter 4 are also connected with a solid residue collector through pipelines. According to the structure, the sludge at the bottoms of the first-stage sewage collecting tank 2 and the second-stage sewage collecting tank 3 and the solid impurities separated by the micro-filter 4 are all discharged into the solid residue collector through the pipeline, and the solid impurities are regularly cleaned by workers.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. High-order pond culture tail water treatment cycle system, its characterized in that: comprises a high-level tank (1), a first-stage sewage collecting tank (2), a second-stage sewage collecting tank (3), a micro-filter (4), a multi-stage treatment tank (5) and a water return tank (6); a sewage discharge pipe and a sewage discharge valve are arranged at the bottom of the elevated tank (1); the sewage discharge pipe is connected with the bottom of the primary sewage collecting tank (2); a first water pipe is arranged on the side wall of the first-stage sewage collecting tank (2); the first water pipe is connected with the bottom of the secondary sewage collecting tank (3); a second water pipe is arranged on the side wall of the secondary sewage collecting tank (3); a first water pump (7) is arranged on the second water pipe; the second water pipe is connected with an inlet of the micro-filter (4); the outlet of the micro-filter (4) is connected with the inlet of the multi-stage treatment pool (5); the outlet of the multi-stage treatment pool (5) is communicated with the inlet of the water return pool (6); a third water pipe is arranged at an outlet of the water return pool (6); the third water pipe is connected with the elevated tank (1); and a second water pump (8) and a water changing valve are arranged on the third water pipe.

2. The elevated pond culture tail water treatment circulation system of claim 1, wherein: and a fish and vegetable symbiotic system (9) is also connected between the multi-stage treatment tank (5) and the water return tank (6).

3. The elevated pond culture tail water treatment circulation system of claim 2, wherein: and a tail water treatment wetland (10) is also connected between the fish and vegetable symbiotic system (9) and the water return pool (6).

4. The elevated pond culture tail water treatment circulation system of claim 3, wherein: the multistage treatment tank (5) comprises a natural sedimentation tank (51), a cobblestone filtering tank (52), a ceramsite filtering tank (53), a biological brush aeration tank (54) and a biological treatment tank (55); the inlet of the multi-stage treatment tank (5) is arranged at the upper end of the natural sedimentation tank (51); a first water drainage tank communicated with the cobblestone filtering tank (52) is arranged on the side wall of the natural sedimentation tank (51); the bottom of the cobblestone filter tank (52) is provided with a water permeable hole communicated with a ceramsite filter tank (53); a second water drainage groove communicated with the biological brush aeration tank (54) is formed in the side wall of the ceramsite filtering tank (53); a third water drainage tank communicated with the biological treatment tank (55) is arranged on the side wall of the biological brush aeration tank (54); the water outlet of the multi-stage treatment tank (5) is arranged on the side wall of the biological treatment tank (55).

5. The elevated pond culture tail water treatment circulation system of claim 3, wherein: a water quality monitor, a drain valve and a controller are also arranged in the tail water treatment wetland (10); the water quality monitor is arranged in the tail water treatment wetland (10) and is used for monitoring the water quality condition; the drain valve is arranged at the water outlet of the tail water treatment wetland (10); the water quality monitor and the drain valve are electrically connected with the controller.

6. The elevated pond culture tail water treatment circulation system of claim 1, wherein: the bottoms of the first-stage sewage collecting tank (2), the second-stage sewage collecting tank (3) and the micro-filter (4) are also connected with a solid residue collector through pipelines.