An aquaculture tailwater recycling system

Abstract

The application discloses an aquaculture tail water recycling treatment system, which comprises a breeding unit, a filtering and adjusting unit, an anaerobic unit, a biological treatment unit and a buffer water storage unit which are sequentially connected, the water outlet of the buffer water storage unit is connected with the backflow port of the breeding unit, and the biological treatment unit comprises a vertical flow artificial wetland, an algae pool, an emergent aquatic plant pool, a submerged aquatic plant pool and an oxygen-rich bacteria cultivation pool which are sequentially connected. The aquaculture tail water recycling treatment system can realize zero discharge and recycling use of the breeding tail water through the step-by-step treatment of the breeding tail water by the breeding unit, the filtering and adjusting unit, the anaerobic unit, the biological treatment unit and the buffer water storage unit.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture tail water treatment, and in particular to an aquaculture tail water circulation treatment system. Background Art

[0002] Aquaculture tailwater has high total nitrogen and low COD. Using conventional biochemical methods to remove these pollutants requires the addition of large amounts of carbon sources. Common carbon sources include carbohydrates that are easily directly utilized by microorganisms, such as methanol, ethanol, starch, glucose, and organic acids. These commonly used carbon sources typically need to be purchased and are relatively expensive. Therefore, the addition of carbon sources will significantly increase the cost of tailwater treatment. Furthermore, since aquatic animals undergo different stages of growth and development during aquaculture, their metabolic products vary significantly, placing a significant impact on the tailwater treatment system. This places high demands on the stability of the tailwater treatment system and the expertise of the system's operators and maintenance personnel. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an aquaculture tailwater recycling treatment system to effectively remove pollutants in the aquaculture tailwater in an ecological management manner, so that the aquaculture water can be recycled and utilized, thereby solving the environmental pollution problem caused by tailwater in the aquaculture industry.

[0004] The present invention solves the above problems through the following technical means:

[0005] An aquaculture tailwater circulation treatment system comprises a breeding unit, a filtration and regulation unit, an anaerobic unit, a biological treatment unit and a buffer water storage unit connected in sequence, wherein the outlet of the buffer water storage unit is connected to the return flow port of the breeding unit, and the biological treatment unit comprises a vertical flow artificial wetland, an algae pond, an emergent biological pond, a submerged biological pond and an oxygen-enriched bacterial culture pond connected in sequence.

[0006] The aquaculture tailwater circulation treatment system of the present invention treats the aquaculture tailwater step by step through the aquaculture units, filtration and regulation units, anaerobic units, biological treatment units and buffer water storage units connected in sequence, thereby achieving zero discharge of aquaculture tailwater and recycling. The vigorous growth and metabolic period of most aquatic organisms overlaps with the vigorous growth period of plants and animals used to remove tailwater pollution elements in this system. The light and heat conditions in the natural cycle are fully utilized to remove the pollution elements in the aquaculture tailwater, and supplementary energy is not used for the treatment and removal of pollution elements when it is not necessary, thereby minimizing energy consumption and reducing carbon emissions. Other aquatic organisms can also be cultured in the biological treatment unit of the present invention, and the organic matter in the tailwater can be converted into feed and fertilizer for resource utilization through biological separation, thereby maximizing the utilization of the organic matter components in the high-protein feed.

[0007] Furthermore, the anaerobic unit includes a plurality of anaerobic tanks connected in sequence, with the water inlet of each anaerobic tank being located at the lower end and the water outlet being located at the upper end. By connecting the plurality of anaerobic tanks in sequence, with the water inlet of each anaerobic tank being located at the lower end and the water outlet being located at the upper end, the tail water entering the anaerobic tanks can overflow through the anaerobic tanks, thereby providing a longer anaerobic reaction time.

[0008] Furthermore, the vertical flow constructed wetland has a water inlet at its bottom and a water outlet at its top. A lightweight filler layer is located above the water inlet, and a layer of emergent plants is placed above the lightweight filler layer. The vertical flow constructed wetland filters aquaculture tailwater to remove some pollutants. Because the wetland's water inlet pipeline is located at the bottom of the vertical flow constructed wetland, the tailwater's retention time is effectively extended, improving filtration effectiveness.

[0009] Furthermore, a suspended algae layer is provided in the algae pool, the water inlet of the algae pool is provided at the top, and the water outlet is provided at the bottom. Organic matter and nitrogen and phosphorus elements in the aquaculture tail water are removed by the suspended algae in the algae pool.

[0010] Furthermore, the emergent biological pool is provided with a secondary suspended algae layer, and an emergent plant layer is provided above the secondary suspended algae layer. The water inlet of the emergent biological pool is provided at the upper part, and the water outlet is provided at the bottom.

[0011] Furthermore, the submerged biomass pond is provided with a submerged plant layer, with the water inlet located at the top and the water outlet located at the bottom. The emergent biomass pond and the submerged biomass pond regulate the carbon-nitrogen ratio and nutrients in the aquaculture tailwater, transferring organic matter and nutrients such as nitrogen and phosphorus from the water to aquatic plants and animals with larger biomass. Finally, the aquatic plants and animals are harvested and caught to remove pollutants from the water.

[0012] Furthermore, the oxygen-enriched culture pool is equipped with a biofilm filter layer, and an aeration pipe is installed at the bottom of the pool. The aeration pipe is connected to the air outlet of the blower. The water inlet of the oxygen-enriched culture pool is located at the top, and the water outlet is located at the bottom. The oxygen-enriched culture pool serves as a guarantee for the final water quality, and artificially enhanced active bacteria are used to eliminate water pollutants and ensure water quality.

[0013] Furthermore, the filtration and regulation unit includes a secondary filtration unit and a regulating tank connected in sequence. The drainage filter pipe and the water collection tank form a secondary filtration unit, which achieves multiple filtration of the tailwater, reduces the total amount of residual feed and aquaculture metabolites entering the downstream tailwater treatment facility, reduces the total nitrogen content entering the downstream tailwater treatment facility, and optimizes the carbon-nitrogen ratio in the downstream tailwater.

[0014] Furthermore, the secondary filtration unit includes a drainage filter pipe and a water collection tank. One end of the drainage filter pipe is connected to the breeding unit, and the other end of the drainage filter pipe is connected to the water collection tank. A filter screen is provided at the end of the drainage filter pipe connected to the breeding unit, and a filter plate is provided in the water collection tank to separate the water collection tank.

[0015] Furthermore, a liquid level gauge is provided in the regulating tank.

[0016] Furthermore, the drainage filter pipe includes a first filter pipe section and a second filter pipe section. The outlet of the first filter pipe section is connected to the inlet of the second filter pipe section. The inlet of the first filter pipe section is located in the aquaculture unit, and the outlet of the second filter pipe section is located in the water collection tank. The second filter pipe section is rotatable to change the height of the outlet of the second filter pipe section. By adjusting the height of the outlet of the second filter pipe section, the water level of the aquaculture unit is controlled, thereby achieving flexible adjustment of the drainage of the aquaculture unit.

[0017] Furthermore, the buffer water storage unit includes a water storage tank and a water storage pressure barrel, the water outlet of the oxygen-enriched bacteria culture tank is connected to the water storage tank, and the water storage tank is connected to the water storage pressure barrel.

[0018] Furthermore, a liquid level gauge is provided in the water storage pressure tank.

[0019] Furthermore, a water outlet connected to the breeding unit is provided at the bottom of the water storage pressure barrel, and a valve is provided at the water outlet.

[0020] The present invention has at least the following beneficial effects:

[0021] The aquaculture tailwater recycling treatment system of the present invention treats aquaculture tailwater in a sequentially connected system consisting of aquaculture units, filtration and regulation units, anaerobic units, biological treatment units, and buffer water storage units, achieving zero discharge and recycling of tailwater. The peak growth and metabolic periods of most aquatic species overlap with the peak growth periods of the plants and animals used in this system to remove tailwater pollutants. This system fully utilizes the natural light and heat cycles to remove pollutants from aquaculture tailwater, minimizing energy consumption and reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 This is a schematic diagram of the aquaculture tail water circulation system of the present invention;

[0024] Figure 2 It is a schematic diagram of the breeding unit and the filtration and regulation unit;

[0025] Figure 3 is a schematic diagram of the anaerobic unit;

[0026] Figure 4is a schematic diagram of a biological treatment unit;

[0027] Figure 5 is a schematic diagram of a buffer water storage unit;

[0028] Figure 6 It is a schematic diagram of the site layout in the implementation project of the present invention.

[0029] Figure numerals: 1, breeding unit; 2, filtration and adjustment unit; 21, secondary filtration unit; 211, drainage filter pipe; 2111, first filter pipe section; 2112, second filter pipe section; 212, water collection tank; 2121, filter plate; 2122, water collection tank inlet; 2123, water collection tank outlet; 22, regulating tank; 3, anaerobic unit; 31, anaerobic tank; 311, anaerobic tank inlet; 312, anaerobic tank outlet; 4, biological treatment unit; 41, vertical flow artificial wetland; 411, vertical flow artificial wetland inlet; 412, vertical flow artificial wetland outlet; 413, lightweight filler layer; 414, first emergent plant layer; 42, algae pool; 421, algae pool inlet; 422, algae Pool outlet; 423, suspended algae layer; 43, emergent biological pool; 431, emergent biological pool inlet; 432, emergent biological pool outlet; 433, second emergent plant layer; 434, secondary suspended algae layer; 44, submerged biological pool; 441, submerged biological pool inlet; 442, submerged biological pool outlet; 443, submerged plant layer; 45, oxygen-enriched bacterial culture pool; 451, oxygen-enriched bacterial culture pool inlet; 452, oxygen-enriched bacterial culture pool outlet; 453, biological film filter layer; 454, aeration pipe; 5, buffer water storage unit; 51, water storage tank; 511, water storage tank inlet; 512, water storage tank outlet; 52, water storage pressure tank outlet; 522, valve. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. The features and advantages of the present invention will become more apparent through these descriptions. Obviously, the described examples are only a portion of the embodiments of the present invention, not all of them.

[0031] like Figure 1-Figure 5 As shown, an aquaculture tailwater circulation treatment system includes a breeding unit 1, a filtration and regulation unit 2, an anaerobic unit 3, a biological treatment unit 4 and a buffer water storage unit 5 connected in sequence, the outlet of the buffer water storage unit 5 is connected to the return port of the breeding unit 1, and the biological treatment unit 4 includes a vertical flow artificial wetland 41, an algae pond 42, an emergent biological pond 43, a submerged biological pond 44 and an oxygen-enriched bacterial culture pond 45 connected in sequence.

[0032] like Figure 2As shown, specifically, the breeding unit 1 includes at least one breeding pond, in which aquatic products are cultured. The tail water generated by the aquatic products during the breeding process contains endogenous pollutants such as bait residues, metabolic feces, animal molting, and dead aquatic products. The tail water outlet connected to the bottom of the breeding pond is connected to the filtration and regulation unit 2, and the filtration and regulation unit 2 includes a drainage filter pipe 211, a water collection tank 212, and a regulating tank 22 connected in sequence. The water collection tank 212 has a water collection tank inlet 2122 and a water collection tank outlet 2123. The drainage filter pipe 211 is provided with a filter screen at one end connected to the breeding unit 1. A filter plate 2121 is provided in the water collection tank 212 to separate the water collection tank 212. The drainage filter pipe 211 and the water collection tank 212 together form a secondary filtration unit 21. The initial filtration size can be adjusted by adjusting the pore size of the filter. The filter plate 2121 in the sump 212 is a coarse screen that intercepts and removes large particles of feed residue, feces, molted skins / scales, sludge, and escaped aquatic animals in the tailwater. The filter plate 2121 is removable, making it easy to replace and adjust the filtration pore size.

[0033] The drainage filter pipe 211 includes a first filter pipe section 2111 and a second filter pipe section 2112, and the first filter pipe section 2111 and the second filter pipe section 2112 are both L-shaped pipes. Figure 1 In the illustrated state, the water inlet of the first filter pipe section 2111 is located in the aquaculture unit 1, and the water outlet of the second filter pipe section 2112 is located in the water collection tank 212. The first and second filter pipe sections 2111, 2112, are connected to form a U-shape. The aquaculture pool is located higher than the water collection tank 212. When the water level in the aquaculture pool exceeds the outlet height of the second filter pipe section 2112, tailwater is discharged into the water collection tank 212 through the drainage filter pipe 211. The first and second filter pipe sections 2111, 2112 are rotatable. By axially rotating the second filter pipe section 2112 relative to the interface with the first filter pipe section 2111, the outlet height of the second filter pipe section 2112 is changed, making it easier to control the water level in the aquaculture pool. The water collection tank 212 collects tailwater from the aquaculture pools. Multiple adjacent aquaculture pools share a single water collection tank 212.

[0034] The regulating tank 22 is a watertight container buried deep underground, used to collect and buffer the impact load of tailwater discharge. Tailwater in the regulating tank 22 is pumped to the anaerobic unit 3 via a variable-frequency centrifugal pump. A level gauge is installed in the regulating tank 22 to monitor the liquid level. The pump can be controlled to pump tailwater to the anaerobic unit 3 when the water level is high. The specific water level threshold can be set as needed. In actual use, the pumps are set up with one in use and one in reserve.

[0035] like Figure 3As shown, the anaerobic unit 3 includes a plurality of anaerobic tanks 31 connected in series or in parallel. The anaerobic tanks 31 have an anaerobic tank water inlet 311 and an anaerobic tank water outlet 312. In this embodiment, the anaerobic tanks 31 are connected in series. Tail water is pumped from the regulating tank 22 into the anaerobic tank 31 through a water pump. The pipe connected to the water pump outlet extends into the bottom of the anaerobic tank 31, and the tail water is pumped into the bottom of the anaerobic tank 31 through the water inlet pipe extending into the bottom of the tank. An outlet is provided at the top of the anaerobic tank 31. When the anaerobic tank 31 is filled with tail water, the water overflows into the next tank. The water inlet and outlet of each anaerobic tank 31 are arranged in the same manner and are connected in series in sequence. This can greatly extend the residence time of the tail water in the anaerobic tank 31. The top of the anaerobic tank 31 is covered with high-density floating plants (not shown), such as Eupatorium spp., Eichhornia crassipes, pink-green foxtail grass, and Lysimachia chinensis. The use of high-density floating plants can block the dissolution of oxygen at the top, and the well-developed root system of the floating plants can further absorb the nitrogen, phosphorus, and potassium elements in the aquaculture tail water. The gases produced during the anaerobic treatment of the tail water will be absorbed by the root system of the floating plants, reducing the release of these gases into the atmosphere. The carbon content in the water body will be increased during the metabolic process of the floating plants, increasing the carbon-nitrogen ratio in the tail water, promoting the efficiency of the anaerobic reaction, and further promoting the efficiency of the aerobic reaction at the rear end. The final overflow from the top of the anaerobic tank 31 will cause the tail water to overflow into the biological treatment unit 4 for further removal of pollutants.

[0036] like Figure 4 As shown, biological treatment unit 4 comprises a vertical flow constructed wetland 41, an algae pond 42, an emergent biological pond 43, a submerged biological pond 44, and an oxygen-enriched bacterial culture pond 45. This comprises a series of high-efficiency ecological ponds connected in series to further treat pollutants in the tailwater. These vertical flow constructed wetland 41, algae pond 42, emergent biological pond 43, submerged biological pond 44, and oxygen-enriched bacterial culture pond 45 are all arranged in a semi-underground structure, with the lower half of each pond below ground level.

[0037] In this embodiment, a vertical flow artificial wetland 41 includes a bottom water inlet pipeline, a lightweight filler layer 413, and a first emergent plant layer 414. The bottom water inlet pipeline has a vertical flow artificial wetland water inlet 411, and a vertical flow artificial wetland water outlet 412 is located at the top of the vertical flow artificial wetland 41. A wetland water inlet pipeline is arranged at the bottom of the vertical flow artificial wetland 41, and a lightweight filler layer 413 is arranged above the wetland water inlet pipeline. Emergent plants are planted on the lightweight filler layer 413 to form a first emergent plant layer 414. The lightweight filler layer 413 can be made of lightweight fillers such as volcanic rock, glass pumice, or ceramsite, and the emergent plants can be selected from emergent plants such as canna, cattail, reed, or reed. The vertical flow artificial wetland 41 filters the aquaculture tailwater to remove some pollutants. Because the wetland water inlet pipeline is arranged at the bottom of the vertical flow artificial wetland 41, the tailwater can be effectively retained for a longer time after entering, improving the filtration effect.

[0038] In this embodiment, algae pond 42 is provided with suspended algae, preferably primarily composed of Chlorella and Scenedesmus. The algae pond inlet 421 is located at the top, and the algae pond outlet 422 is located at the bottom. The suspended algae are photoautotrophs. When the carbon-nitrogen ratio is low, they can utilize nitrogen and phosphorus in the tailwater. Under light conditions, they absorb carbon from the water and air for their own metabolic synthesis and release large amounts of oxygen, transforming the anaerobic water environment into an oxygen-saturated water environment. The continuously growing suspended algae reduces nitrogen and phosphorus content in the tailwater and increases carbon content in the water, further optimizing and regulating the carbon-nitrogen ratio in the tailwater and facilitating further biological utilization. The algae in algae pond 42 are primarily affected by light and live on the surface of the water, but a small amount of algae will still enter other biological ponds at the rear end through the bottom drain. An artificial lighting system is provided in algae pond 42, comprising an electrically connected controller, a fill light, and an oxygen content probe (not shown). The oxygen content in the water is monitored by an oxygen content probe, and night light is provided when there is a lack of light at night and the dissolved oxygen in the water is insufficient. The opening and closing of the fill light is controlled by a controller combined with the oxygen content probe.

[0039] In this embodiment, the emergent biological pond 43 is provided with a secondary suspended algae layer 434, above which a second emergent plant layer 433 is provided. The emergent biological pond 43 is provided with an emergent biological pond water inlet 431 at the top and an emergent biological pond water outlet 532 at the bottom. The algae in the secondary suspended algae layer 434 originate from the algae pond 42. The algae in the algae pond 42 are carried into the emergent biological pond 43 by the flow of water, forming the secondary suspended algae layer 434. The roots of the emergent plants can be anchored in the secondary phytoplankton layer of the emergent biological pond 43. The roots of the emergent plants can secrete polysaccharides that inhibit algae growth. Furthermore, the emergent plants block most of the sunlight entering the water, causing suspended algae such as coccolithophores and scenedesmus that enter the emergent biological pond 43 from the algae pond 42 with the tailwater to die. These algae become nutrients for aquatic plants and animals, and the die-off algae release carbon sources, increasing the biodegradability of the water. In the emergent biological pond 43 , filter-feeding organisms such as silver carp and shellfish are cultured to feed on the suspended algae in the emergent biological pond 43 , thereby reducing the amount of suspended algae and controlling the amount of suspended algae flowing out of the emergent biological pond 43 with the tail water.

[0040] In this embodiment, submerged bio-tank 44 is equipped with submerged plants, such as Elodea and Vallisneria. A water inlet 441 is located at the top of the submerged bio-tank 44, and a water outlet 442 is located at the bottom. After previous tailwater treatment, the water in the submerged bio-tank 44 is highly clear, and the submerged bio-tank undergoes vigorous metabolic activity under the influence of light. The metabolic process of the submerged bio-tank further removes nutrient-rich elements such as nitrogen, phosphorus, and potassium from the water, while simultaneously releasing large amounts of oxygen, maintaining a high oxygen content in the water. An artificial lighting system (not shown) is provided within the submerged bio-tank 44. The system comprises an electrically connected controller, a fill light, and an oxygen probe. The oxygen probe monitors the oxygen content in the water. At night, when light is scarce and dissolved oxygen is insufficient, fill light is provided. The fill light is turned on and off by the controller in conjunction with the oxygen probe. The effluent from the submerged bio-tank 44 enters the oxygen-enriched bacterial culture tank 45 for further pollution removal. Through the emergent organisms in the emergent organism pool 43 and the submerged organisms in the submerged organism pool 44, the carbon-nitrogen ratio and nutrients in the aquaculture tail water are adjusted, and the organic matter and nutrients such as nitrogen and phosphorus in the water body are transferred to aquatic plants and animals with larger biomass. Finally, the pollutants in the water body are removed by harvesting and catching the aquatic plants and animals.

[0041] In this embodiment, the oxygen-enriched bacteria culture pool 45 is provided with a biological biofilm filter material, and an aeration pipe 454 is provided at the bottom of the oxygen-enriched bacteria culture pool 45. An oxygen-enriched bacteria culture pool water inlet 451 is provided at the top of the oxygen-enriched bacteria culture pool 45, and an oxygen-enriched bacteria culture pool water outlet 452 is provided at the bottom. The oxygen-enriched bacteria culture pool 45 is used to guarantee the final water quality, and artificially enhanced active bacteria are used to eliminate the final water pollutants and ensure the water quality. The oxygen-enriched bacteria culture pool 45 is the last link in the recycling treatment of aquaculture tail water, and plays the role of the ultimate guarantee of water quality. The oxygen-enriched bacteria culture pool 45 will be filled with biological biofilm filter material, and a high-pressure blower will be used to connect the aeration pipe 454 for bottom aeration. After the pollutants in the tail water are difficult to be treated by the various units at the front end, artificially domesticated bacteria are added to the oxygen-enriched bacteria culture pool 45, and the filler is used to allow the bacteria to grow and metabolize as biofilms. The microbial activity of the active bacteria is used to efficiently transform and remove the pollutants in the aquaculture tail water. The blower in oxygen-enriched culture tank 45 is electrically connected to the controller. An oxygen probe, also electrically connected to the controller, is also installed in oxygen-enriched culture tank 45 to monitor the oxygen content in the tank online. When the pollutant removal rate and oxygen content in the circulating aquaculture water are low, the blower automatically turns on and controls the aeration rate based on the pollutant removal rate and oxygen concentration.

[0042] In the process of aquaculture, with the growth and development of aquatic organisms, there is a large fluctuation in water quality. Compared with juvenile aquatic organisms, adult aquatic organisms will produce more metabolic waste. The metabolic products of juvenile aquatic organisms are more easily decomposed and transformed. When a large number of aquatic organisms enter the adult stage, their metabolic products will cause a large increase in the pollution indicators of the tail water of the cultivation. The present embodiment further processes the tail water by the oxygen-rich bacteria cultivation pool 45, and has a good effect on the tail water produced by adult aquatic organisms.

[0043] As shown in Figure 5 The buffer water storage unit 5 includes a water storage pool 51 and a water storage pressure barrel 52. The water outlet of the oxygen-rich bacteria cultivation pool 45 is connected with the water inlet 551 of the water storage pool. The water outlet 512 of the water storage pool is connected with the water storage pressure barrel 52 through a water pump and a pipeline. After the tail water is treated by the filtration and adjustment unit 2, the anaerobic unit 3 and the biological treatment unit 4, the pollution elements in the tail water are removed, and the treated tail water can be used for further cultivation. The treated tail water flows into the water storage pool 51, and then is transported into the water storage pressure barrel 52 through a water pump and a pipeline. The water storage pressure barrel 52 is installed at a height higher than the cultivation pool, so that water can flow into the cultivation pool by gravity when water is needed. A liquid level meter is arranged in the cultivation pool pressure barrel to detect the liquid level height in the cultivation pool pressure barrel. A water outlet is arranged at the bottom of the water storage pressure barrel 52 and connected with the cultivation unit 1. A valve 522 is arranged at the water outlet to control the water flow by opening and closing the valve 522.

[0044] In the present embodiment, the cultivation unit 1, the anaerobic unit 3 and the water storage pressure barrel 52 are installed above the ground, and the filtration and adjustment unit 2, the biological treatment unit 4 and the main part of the water storage pool 51 are arranged below the ground. When the tail water needs to be transported from bottom to top, a water pump is arranged to provide driving force. When the tail water flows from top to bottom, it relies on its own gravity. Of course, in other embodiments, the installation positions of some units can be changed to meet the actual project requirements.

[0045] The application scenarios and tail water treatment effects of the present application will be described below in combination with a specific project example.

[0046] As shown in Figure 6 In the actual case applied by the present application, the cultivated aquatic products are bullfrogs, which are cultivated in waterproof canvas pools. The total water surface area of the cultivation pools is about 18000m 3 The design parameters of each unit in the present project are as follows:

[0047] Design parameters of up-flow vertical flow constructed wetland

[0048]

[0049] Design parameters for efficient algae ponds

[0050]

[0051] Design parameters of emergent plant pond

[0052]

[0053] Design parameters of submerged plant pool

[0054]

[0055] Design parameters of oxygen-enriched culture pool

[0056]

[0057] Effect of program implementation:

[0058] Operation effect during tadpole seedling period (April-May, 3mm-20mm tadpole seedlings, no aeration required)

[0059]

[0060] Effect of operation during the juvenile frog period (June-July, 50g-200g four-legged frog, no aeration required)

[0061]

[0062] Operation effect during adult frog period (August-October, 200g-600g adult frogs, aeration required)

[0063]

[0064] In summary, the aquaculture tailwater recycling treatment system of this embodiment achieves effective removal of pollutants in aquaculture tailwater in an ecological management manner, enables recycling of aquaculture water, and solves the long-standing environmental pollution problem in the aquaculture industry.

[0065] Unless otherwise stated, for any of the technical solutions disclosed in the present invention, if a numerical range is disclosed, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely a numerical range that is representative or has a more obvious technical effect among many feasible numerical values. Due to the large number of numerical values, it is impossible to enumerate them exhaustively. Therefore, the present invention discloses some numerical values ​​to illustrate the technical solutions of the present invention. Moreover, the numerical values ​​listed above should not be construed as limiting the scope of protection of the present invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An aquaculture tailwater circulation treatment system, characterized by: The invention comprises a breeding unit (1), a filtration and regulation unit (2), an anaerobic unit (3), a biological treatment unit (4) and a buffer water storage unit (5) connected in sequence, wherein the outlet of the buffer water storage unit (5) is connected to the return flow port of the breeding unit (1), and the biological treatment unit (4) comprises a vertical flow artificial wetland (41), an algae pond (42), an emergent biological pond (43), a submerged biological pond (44) and an oxygen-enriched bacterial culture pond (45) connected in sequence; The anaerobic unit (3) comprises a plurality of anaerobic tanks (31) connected in sequence, wherein a floating plant layer is provided on the top of the anaerobic tank (31), and the water inlet of each anaerobic tank (31) is provided at the lower end, and the water outlet is provided at the upper end; the floating plant layer is made of high-density floating plants that can block the dissolution of oxygen at the top; A water inlet is provided at the bottom of the vertical flow artificial wetland (41), a water outlet is provided at the top of the vertical flow artificial wetland (41), a light filler layer (413) is provided above the water inlet, and a first emergent plant layer (414) is provided on the light filler layer (413); The emergent biological pool (43) is provided with a secondary suspended algae layer (434), a second emergent plant layer (433) is provided above the secondary suspended algae layer (434), and the water inlet of the emergent biological pool (43) is provided at the upper part, and the water outlet is provided at the bottom; The algae pool (42) is provided with a suspended algae layer (423), the water inlet of the algae pool (42) is provided at the upper portion, and the water outlet is provided at the bottom; The algae in the secondary suspended algae layer (434) originate from the algae pond (42), and the algae in the algae pond (42) are carried into the emergent biological pond (43) as the water flows to form the secondary suspended algae layer (434); the roots of the emergent plants can be fixed in the secondary floating algae layer of the emergent biological pond (43); the emergent plants block most of the sunlight entering the water body, causing the suspended algae that enter the emergent biological pond (43) from the algae pond (42) with the tail water to die; in the emergent biological pond (43), silver carp and shellfish are cultured and feed on the suspended algae in the emergent biological pond (43).

2. The aquaculture tailwater circulation treatment system according to claim 1, characterized in that: A submerged plant layer (443) is provided in the submerged organism pool (44), and a water inlet of the submerged organism pool (44) is provided at the upper portion, and a water outlet is provided at the bottom.

3. The aquaculture tailwater circulation treatment system according to claim 1, characterized in that: A biological membrane filter material layer (453) is provided in the oxygen-enriched bacteria culture pool (45), an aeration pipe (454) is provided at the bottom of the oxygen-enriched bacteria culture pool (45), the aeration pipe (454) is connected to the air outlet of the blower, the water inlet of the oxygen-enriched bacteria culture pool (45) is provided at the top, and the water outlet is provided at the bottom.

4. The aquaculture tailwater circulation treatment system according to claim 1, characterized in that: The filtering and regulating unit (2) comprises a secondary filtering unit (21) and a regulating tank (22) connected in sequence, the secondary filtering unit (21) comprising a drainage filter pipe (211) and a water collecting tank (212), one end of the drainage filter pipe (211) being connected to the breeding unit (1), and the other end of the drainage filter pipe (211) being connected to the water collecting tank (212), a filter screen being provided at the end of the drainage filter pipe (211) connected to the breeding unit (1), a filter plate (2121) being provided in the water collecting tank (212) for separating the water collecting tank (212), and the water collecting tank (212) separated by the filter plate (2121) having a water inlet at one end and a water outlet at the other end.

5. The aquaculture tailwater circulation treatment system according to claim 4, characterized in that: The drainage filter pipe (211) comprises a first filter pipe section (2111) and a second filter pipe section (2112); the water outlet of the first filter pipe section (2111) is connected to the water inlet of the second filter pipe section (2112); the water inlet of the first filter pipe section (2111) is arranged in the breeding unit (1), and the water inlet of the first filter pipe section (2111) is covered with a filter screen; the water outlet of the second filter pipe section (2112) is arranged in the water collection tank (212), and the second filter pipe section (2112) can be rotated to change the height of the water outlet of the second filter pipe section (2112).

6. The aquaculture tailwater circulation treatment system according to claim 1, characterized in that: The buffer water storage unit (5) comprises a water storage tank (51) and a water storage pressure barrel (52); the water outlet of the oxygen-enriched bacterial culture pool (45) is connected to the water storage tank (51), and the water storage tank (51) is connected to the water storage pressure barrel (52); the bottom of the water storage pressure barrel (52) is provided with a water outlet connected to the cultivation unit (1), and a valve (522) is provided at the water outlet.

Images