Aquaculture tailwater treatment system

Abstract

The present invention is a kind of aquaculture tailwater treatment system, which includes a main sedimentation tank, a secondary sedimentation tank, a biological treatment internal circulation system, etc. connected in sequence, wherein the biological treatment internal circulation system is composed of a biofilm treatment tank, a tank body containing phytoplankton, aquatic plants, fungi, and benthic organisms; a buffer tank, which is adjacent to the biofilm treatment tank, when the tailwater in the biofilm treatment tank exceeds the threshold, the tailwater in the biofilm treatment tank flows into the buffer tank, and a water lifting device is provided inside the buffer tank; an aeration tank, which is adjacent to the biofilm treatment tank and the buffer tank, and an aeration device is provided in the aeration tank, and the aeration tank is used to receive the tailwater flowing out of the water lifting device in the buffer tank, and the bottom of the aeration tank is also connected to the bottom of the biofilm treatment tank. The advantage of the present invention is that by establishing "sedimentation-biological nitrogen and phosphorus removal-disinfection" to reduce the solid impurities, nitrogen and phosphorus, and harmful microorganisms in the tailwater, the aquaculture tailwater can be treated and reused, and finally the tailwater can be discharged up to the standard or recycled.

Description

Technical Field

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

[0002] Traditional aquaculture tailwater is mostly treated by sedimentation and filtration (such as "three ponds and two dams"). During the treatment process, the residual bait and excrement in the tailwater are precipitated and filtered, and the residual bait and excrement in the tailwater are precipitated (sedimentation tank) and filtered (such as filter dam or biofilm treatment). The filtered sewage is directly discharged; the sediment is removed after a period of time and used directly as fertilizer. First, because the sediment is not removed from the system in time, the sediment will continue to release nitrogen and phosphorus, which will cause the nitrogen and phosphorus content of the water body to continue to increase; second, if the tailwater flow is too large (such as traditional eel farming, high-level pond shrimp farming, etc.), the biofilm treatment system in the dam is not perfect, or there is not enough time or the system collapses, it is often difficult to achieve the "ideal" treatment effect, resulting in pollution or eutrophication of the external water body. Summary of the invention

[0003] The purpose of the present invention is to provide an aquaculture tailwater treatment system, establish "sedimentation-biological nitrogen and phosphorus removal-disinfection" to reduce solid impurities, nitrogen and phosphorus, and harmful microorganisms in the tailwater, so that the aquaculture tailwater can be treated and reused, and finally the tailwater can be discharged up to standard or recycled.

[0004] The present invention is realized by the following technical scheme: Aquaculture tail water treatment system, characterized in that:

[0005] The main sedimentation tank is used to receive the tail water from the aquaculture pond. The bottom surface of the main sedimentation tank is an inclined surface or a funnel-shaped bottom surface;

[0006] Auxiliary sedimentation tank, adjacent to the main sedimentation tank, the bottom of the auxiliary sedimentation tank is an inclined surface or a funnel-shaped bottom surface; when the tail water in the main sedimentation tank exceeds the threshold, the tail water in the main sedimentation tank flows into the auxiliary sedimentation tank;

[0007] The tank bottom suction device extends to the lowest point of the bottom surface of the main sedimentation tank and the auxiliary sedimentation tank through a pipeline or a channel, and is used to suck the concentrated sediment at the bottom of the tank; the tank bottom suction device 3 is a water pump.

[0008] The biological treatment internal circulation small system has two or more groups and is used to treat nitrogen and phosphorus in water;

[0009] The biological treatment internal circulation subsystem comprises

[0010] Biofilm treatment pool 4, containing phytoplankton, aquatic plants, fungi, and benthic organisms;

[0011] The buffer tank is adjacent to the biofilm treatment tank 4. When the tail water in the biofilm treatment tank 4 exceeds the threshold, the tail water in the biofilm treatment tank 4 flows into the buffer tank. A water lifting device is provided inside the buffer tank.

[0012] The aeration tank is adjacent to the biofilm treatment tank 4 and the buffer tank. The aeration tank is provided with an aeration device. The aeration tank is used to receive the tail water flowing out of the water extraction device in the buffer tank. The bottom of the aeration tank is also connected to the bottom of the biofilm treatment tank 4.

[0013] In any adjacent biological treatment internal circulation small systems, the aeration tank of the previous group of biological treatment internal circulation small systems is connected to the aeration tank or buffer tank of the next group of biological treatment internal circulation small systems, so that when the tail water in the aeration tank of the previous group of biological treatment internal circulation small systems exceeds the threshold, the tail water can flow into the aeration tank or buffer tank of the next group of biological treatment internal circulation small systems.

[0014] The aeration tank or buffer tank in the first group of biological treatment internal circulation small system is adjacent to the secondary sedimentation tank, so that when the tail water in the secondary sedimentation tank exceeds the threshold, the tail water in the secondary sedimentation tank flows into the aeration tank or buffer tank of the first group of biological treatment internal circulation small system.

[0015] Compared with the previous technology, the beneficial effects of the present invention are:

[0016] 1. The main sedimentation tank and the auxiliary sedimentation tank can settle the residual bait and feces in the tail water. In addition, a bottom suction device is added to concentrate the solid matter in the main sedimentation tank and the auxiliary sedimentation tank, and then extract it for treatment as organic fertilizer.

[0017] 2. Add a small internal circulation system for biological treatment, which can establish a circulation treatment for the sustainable utilization of bacteria, algae and other organisms in the tail water to remove nitrogen and phosphorus in the tail water.

[0018] 3. The middle attachment layer of the biofilm treatment pool 4 adopts a colony attachment structure, in which gaps are provided to enable the upward and downward flow of water in the pool and the exchange of substances. The bacteria attached to the middle attachment layer can utilize organic matter in the water for metabolism and reduce nitrogen and phosphorus in the water.

[0019] 4. The bacteria on the colony attachment structure of the biofilm treatment pool 4 continue to grow and reproduce to form a "biofilm"; as the biofilm utilizes nutrients in the water, it continues to thicken, and after the bacteria increase in weight and die, they will fall off the colony attachment structure and provide food for benthic organisms in the lower aquaculture layer. At the same time, some algae will also attach to the colony attachment structure to achieve algae reproduction and proliferation.

[0020] 5. The upper planting layer of the biofilm treatment pool 4 can be used to plant some aquatic plants, such as water hyacinth and foxtail algae, which can effectively absorb nitrogen and phosphorus in the water.

[0021] 6. An air disk is added to the bottom of the biofilm treatment pool 4 to provide oxygen for the organisms in the lower culture layer. In addition, the rising oxygen can provide oxygen for the bacteria in the middle attachment layer and the organisms in the upper culture layer.

[0022] 7. A lighting system is arranged on the upper part of the biofilm treatment pool 4 or on the water surface to ensure a certain light source, so as to create suitable conditions for bacteria and algae to utilize nutrients in the water at night.

[0023] 8. By reusing the aquaculture tail water in the biofilm treatment pool 4, the re-export of aquatic products can be achieved.

[0024] 9. The buffer tank receives the tail water from the biofilm treatment tank 4 and provides power for the circulation of the biological treatment internal circulation system through the water lifting device.

[0025] 10. The oxygenation tank increases the oxygen content in each biological treatment internal circulation system through oxygenation equipment, breaks the water body thermocline, and ensures the metabolism of phytoplankton, such as algae, in the system.

[0026] 11. Setting up multiple groups of biological treatment internal circulation small systems can ensure multi-stage nitrogen and phosphorus treatment of tail water and ensure that the final nitrogen and phosphorus content of tail water is lower than the emission value stipulated by the state.

[0027] 12. Ultraviolet or ozone disinfection equipment kills bacteria, insects, etc. contained in the tail water to ensure that the discharged tail water does not contain excessive bacteria and insects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the first embodiment of the main and auxiliary sedimentation tanks equipped with the tank bottom suction device of the present invention;

[0030] Figure 3 This is a structural schematic diagram of a second embodiment of the main and auxiliary sedimentation tanks in combination with a tank bottom suction device of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the cell body with a connecting pipe of the present invention;

[0032] Figure 5 It is a cross-sectional view between the auxiliary sedimentation tank and the tank body with the connecting pipe of the present invention;

[0033] Figure 6 It is a cross-sectional view between the biofilm treatment tank and the oxygenation tank of the present invention.

[0034] Description of symbols

[0035] 1 main sedimentation tank, 2 auxiliary sedimentation tank, 3 pool bottom suction device, 4 biofilm treatment tank, 41 upper planting layer, 42 middle attachment layer, 421 colony attachment structure, 43 lower breeding layer, 431 air disk, 5 buffer tank, 51 water pipe, 52 second air disk, 6 oxygenation tank, 7 connecting pipe, 81 disinfection device, 82 aeration tank, 83 artificial wetland, 91 gap, 92 sewage concentration collection chamber, 94 sewage collecting tank. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings:

[0037] like Figure 1-6 As shown, the present invention is a system for treating aquaculture tail water, comprising:

[0038] The main sedimentation tank 1 is used to receive the tail water transported from the breeding pond, and the bottom surface of the main sedimentation tank 1 is an inclined surface or a funnel-shaped bottom surface;

[0039] The auxiliary sedimentation tank 2 is adjacent to the main sedimentation tank 1, and the bottom surface of the auxiliary sedimentation tank 2 is an inclined surface or a funnel-shaped bottom surface; when the tail water in the main sedimentation tank 1 exceeds the threshold, the tail water in the main sedimentation tank 1 flows into the auxiliary sedimentation tank 2;

[0040] Here, a notch 91 or an opening or a channel pipe is provided on the upper part of the wall at the connection between the main sedimentation tank and the auxiliary sedimentation tank. When the tail water in the breeding pond is discharged into the main sedimentation tank, the water level in the main sedimentation tank exceeds the height of the notch, and the tail water in the main sedimentation tank will flow into the auxiliary sedimentation tank. The above threshold generally refers to the tail water capacity in the tank body when the liquid level of the tail water in the tank body reaches the notch position.

[0041] The bottom suction device 3 extends to the lowest point of the bottom surface of the main sedimentation tank 1 and the auxiliary sedimentation tank 2 through a pipe or channel, and is used to suck the concentrated sediment at the bottom of the tank; in order to ensure the convergence effect, a sewage collection tank 94 can be made at the main sedimentation tank 1 and the auxiliary sedimentation tank 2, and the pipe can be extended into the sewage collection tank 94; in addition, it can be considered to add a plate filter press 93 at the main sedimentation tank and the auxiliary sedimentation tank to filter the sucked solid-liquid mixture to form a block mainly composed of residual bait and feces, which can be used as an organic fertilizer. The bottom suction device is a water pump, which sucks the sediment by connecting the pipe and directly extending the pipe into the bottom of the auxiliary sedimentation tank and the main sedimentation tank. In addition, it can be considered to set a channel extending obliquely downward in the auxiliary sedimentation tank and the main sedimentation tank, leading to a sewage concentration collection chamber 92, and pumping it out through a water pump.

[0042] The biological treatment internal circulation small system has two or more groups arranged in sequence to treat nitrogen and phosphorus in water;

[0043] The biological treatment internal circulation subsystem comprises

[0044] Biofilm treatment pool 4, containing phytoplankton, aquatic plants, fungi, and benthic organisms;

[0045] The buffer tank 5 is adjacent to the biofilm treatment tank 4. When the tail water in the biofilm treatment tank 4 exceeds the threshold, the tail water in the biofilm treatment tank 4 flows into the buffer tank 5. A water lifting device is provided inside the buffer tank 5.

[0046] The aeration tank 6 is adjacent to the biofilm treatment tank 4 and the buffer tank 5. An aeration device is provided in the aeration tank 6. The aeration tank 6 is used to receive the tail water flowing out of the water lifting device in the buffer tank 5. The bottom of the aeration tank 6 is also connected to the bottom of the biofilm treatment tank 4. The biofilm treatment tank 4 is connected to the middle of the aeration tank 6 through a channel.

[0047] In any adjacent biological treatment internal circulation small systems, the aeration tank 6 of the previous group of biological treatment internal circulation small systems is connected to the aeration tank 6 or buffer tank 5 of the next group of biological treatment internal circulation small systems, so that when the tail water in the aeration tank 6 of the previous group of biological treatment internal circulation small systems exceeds the threshold, the tail water can flow into the aeration tank 6 or buffer tank 5 of the next group of biological treatment internal circulation small systems.

[0048] The aeration tank 6 or buffer tank 5 in the first group of biological treatment internal circulation small systems is adjacent to the secondary sedimentation tank 2, so that when the tail water in the secondary sedimentation tank 2 exceeds the threshold, the tail water in the secondary sedimentation tank 2 flows into the aeration tank 6 or buffer tank 5 of the first group of biological treatment internal circulation small systems.

[0049] During the actual construction process, the heights of the main sedimentation tank 1 and the auxiliary sedimentation tank 2 are generally higher than any tank in the biological treatment internal circulation system.

[0050] Here, the tail water in the secondary sedimentation tank flows into the aeration tank or buffer tank of the first group of biological treatment internal circulation small systems, and the tail water in the aeration tank of the previous group of biological treatment internal circulation small systems preferentially flows into the aeration tank or buffer tank of the next group of biological treatment internal circulation small systems; the main consideration is that there may be certain drugs in the discharged tail water. If it is to be discharged directly into the biofilm treatment tank 4, it will cause a large number of organisms, especially bacteria and algae in the biofilm treatment tank 4 to die; by buffering, diluting, and discharging in the aeration tank or buffer tank before discharging into the biofilm treatment tank 4, the death of bacteria and algae in the biofilm treatment tank 4 can be effectively avoided.

[0051] A plurality of connecting pipes of different heights are arranged in the aeration tank or buffer tank in the first group of biological treatment internal circulation small systems, and the connecting pipes are connected to the bottom of the auxiliary sedimentation tank.

[0052] The biological treatment internal circulation subsystem receives tail water overflowing from the auxiliary sedimentation tank or the previous group of biological treatment internal circulation subsystems. The tail water here contains extremely small particles of solid matter, or a large amount of nitrogen and phosphorus dissolved components. Through the water circulation of the biological treatment internal circulation subsystem and various levels of biological treatment, the nitrogen and phosphorus components in the tail water are removed so that the tail water can meet the discharge or aquaculture standards.

[0053] Specifically, the biological treatment internal circulation small system receives the tail water overflowed from the auxiliary sedimentation tank or the previous group of biological treatment internal circulation small systems and flows into the surface of the buffer tank. The tail water in the buffer tank passes through the water lifting device to allow the tail water in the buffer tank to enter the aeration tank. The bottom of the aeration tank and the biofilm treatment tank 4 are interconnected, so that the tail water at the bottom of the aeration tank enters the biofilm treatment tank 4. The conversion of nitrogen and phosphorus is achieved through the use of the cultured bacteria and algae, aquatic plants, fish, shrimp and shellfish in the biofilm treatment tank 4, and the nutrients are transferred from the tail water to the cultured bacteria and algae, aquatic plants, and aquatic organisms. The above realizes the circulation of the tail water on the surface of the biofilm treatment tank 4 entering the surface of the buffer tank, the tail water at the bottom of the buffer tank entering the surface of the aeration tank, and the tail water at the bottom of the aeration tank entering the bottom of the biofilm treatment tank 4, ensuring that there is no dead water in the biological treatment internal circulation small system.

[0054] Of course, the flow between the surface and the bottom can be adjusted to a circulation in which the tail water from the bottom of the biofilm treatment tank 4 enters the bottom of the buffer tank, the surface of the buffer tank enters the bottom of the aeration tank, and the tail water from the surface of the aeration tank enters the surface of the biofilm treatment tank 4. It is only necessary to adjust the position of the bottom channel and the water lifting device.

[0055] Biofilm treatment tank is divided into 4 parts

[0056] The upper planting layer 41 is used for planting aquatic plants;

[0057] The lower culture layer 43 is provided with an aeration structure for cultivating aquatic organisms;

[0058] The middle attachment layer 42 is arranged in the middle layer of the biofilm treatment pool 4 and is a colony attachment structure 421 with a certain gap to enable material exchange between the upper planting layer 41 and the middle attachment layer 42;

[0059] A lighting system is arranged on the upper part or the surface of the biofilm treatment tank 4 .

[0060] The colony attachment structure 421 is an upper and lower binding net disposed in the middle layer of the biofilm treatment pool 4, and a porous bacterial bed of a plurality of plastic balls, plastic sheets, etc. is filled between the upper and lower binding nets;

[0061] Or it may be a plurality of connecting wires arranged in the middle layer of the biofilm treatment pool 4, each of which is provided with a plurality of brush beds.

[0062] The aquatic plants include water hyacinth and foxtail algae. The aquatic plants here can be some that can absorb nitrogen and phosphorus in water. The benthic organisms include fish, snails, shellfish, shrimps, etc., and the phytoplankton is mostly algae.

[0063] A lighting system is installed on the upper part of the pond or on the water surface to ensure a certain light source, so as to create suitable conditions for organisms to utilize nutrients in the water at night.

[0064] The aeration structure includes an air disk 431 arranged on the lower culture layer 43, an air pump arranged on the side of the biofilm treatment pool 4, and a connecting pipe connecting the air disk 431 and the air pump.

[0065] The water lifting device includes a water pipe 51 and a second air disc 52 connected to an air pump, wherein the second air disc 52 is arranged at the bottom of the buffer tank 5, and the second air disc 52 extends into the beginning of the water pipe 51, and the end of the water pipe 51 extends to the aeration tank 6. It should be noted that the water from the water lifting device can drive the tail water in the aeration tank to flow, ensuring that the waste can be gathered in the middle of the bottom of the aeration tank. Since my country is in the northern hemisphere, it is appropriate to control the direction of the water lifting device to ensure that the tail water in the aeration tank can rotate counterclockwise.

[0066] The present invention also includes a disinfection device 81, and the oxygenation tank 6 or buffer tank 5 of the last group of biological treatment internal circulation small systems is connected to the water inlet of the disinfection device 81, and the tail water disinfected by the disinfection device 81 is discharged to the breeding pond or the outside after aeration. The disinfection device here is a conventional ultraviolet disinfection device or an ozone disinfection device.

[0067] Furthermore, it includes an aeration tank 82 , which is connected to the water outlet of the disinfection device 81 and is used to receive the tail water disinfected by the disinfection device 81 .

[0068] Furthermore, it includes an artificial wetland 83, which is connected to the aeration tank 82 and is used to receive tail water treated by aeration. The tail water of the artificial wetland 83 is finally discharged to the breeding pond or directly discharged externally.

[0069] Although the present invention is illustrated and described by specific embodiments and their alternatives, it should be understood that various changes and modifications within the spirit and scope of the present invention can be implemented. Therefore, it should be understood that the present invention is not limited in any sense except by the limitations of the attached claims and their equivalents.

Claims

1. Aquaculture tail water treatment system, characterized by: include A main sedimentation tank (1) is used to receive tail water transported from the aquaculture pond, and the bottom surface of the main sedimentation tank (1) is an inclined surface or a funnel-shaped bottom surface; The auxiliary sedimentation tank (2) is adjacent to the main sedimentation tank (1), and the bottom surface of the auxiliary sedimentation tank (2) is an inclined surface or a funnel-shaped bottom surface; when the tail water in the main sedimentation tank (1) exceeds a threshold value, the tail water in the main sedimentation tank (1) flows into the auxiliary sedimentation tank (2); A tank bottom suction device (3) extending through a pipeline or a channel to the lowest point of the bottom surface of the main sedimentation tank (1) and the auxiliary sedimentation tank (2) for sucking concentrated sediment from the tank bottom; The biological treatment internal circulation small system has two or more groups arranged in sequence to treat nitrogen and phosphorus in water; The biological treatment internal circulation subsystem comprises Biofilm treatment tank (4), containing phytoplankton, aquatic plants, fungi, and benthic organisms; The buffer tank (5) is adjacent to the biofilm treatment tank (4). When the tail water in the biofilm treatment tank (4) exceeds a threshold value, the tail water in the biofilm treatment tank (4) flows into the buffer tank (5). A water lifting device is provided inside the buffer tank (5); an aeration tank (6) adjacent to the biofilm treatment tank (4) and the buffer tank (5); an aeration device is provided in the aeration tank (6); the aeration tank (6) is used to receive tail water flowing out of the water extraction device in the buffer tank (5); and the bottom of the aeration tank (6) is also connected to the bottom of the biofilm treatment tank (4); In any adjacent biological treatment internal circulation small systems, the aeration tank (6) of the previous biological treatment internal circulation small system is connected to the aeration tank (6) or buffer tank (5) of the next biological treatment internal circulation small system, so that when the tail water in the aeration tank (6) of the previous biological treatment internal circulation small system exceeds a threshold value, the tail water can flow into the aeration tank (6) or buffer tank (5) of the next biological treatment internal circulation small system; The aeration tank (6) or the buffer tank (5) in the first group of biological treatment internal circulation small systems is adjacent to the auxiliary sedimentation tank (2), so that when the tail water in the auxiliary sedimentation tank (2) exceeds a threshold value, the tail water in the auxiliary sedimentation tank (2) flows into the aeration tank (6) or the buffer tank (5) in the first group of biological treatment internal circulation small systems; Biofilm treatment tank (4) is divided into An upper planting layer (41) for planting aquatic plants; The lower culture layer (43) is provided with an aeration structure and is used for cultivating aquatic organisms; The middle attachment layer (42) is arranged in the middle layer of the biofilm treatment tank (4) and is a colony attachment structure (421) with a certain gap to enable material exchange between the upper planting layer (41) and the middle attachment layer (42); A lighting system is arranged on the upper part or surface of the biofilm treatment tank (4); The water lifting device comprises a water pipe (51) and a second air disc (52) connected to an air pump, wherein the second air disc (52) is arranged at the bottom of the buffer tank (5), the second air disc (52) extends into the beginning of the water pipe (51), and the end of the water pipe (51) extends to the aeration tank (6); A plurality of connecting pipes (7) of different heights are provided in the aeration tank (6) or the buffer tank (5) in the first group of biological treatment internal circulation small systems. The connecting pipes (7) are connected to the bottom of the auxiliary sedimentation tank (2).

2. The aquaculture tailwater treatment system according to claim 1, characterized in that: The colony attachment structure (421) is an upper and lower layer of restraining nets arranged in the middle layer of the biofilm treatment pool (4), and a plurality of plastic balls and plastic sheets are filled between the upper and lower layers of restraining nets; Or it may be a plurality of connecting wires arranged in the middle layer of the biofilm treatment pool (4), each connecting wire being provided with a plurality of bristles.

3. The aquaculture tailwater treatment system according to claim 1, characterized in that: The aeration structure comprises an air disk (431) arranged on the lower culture layer (43), an air pump arranged on the side of the biofilm treatment pool (4), and a connecting pipe connecting the air disk (431) and the air pump.

4. The aquaculture tailwater treatment system according to claim 1, characterized in that: The pool bottom suction device (3) is a water pump.

5. The aquaculture tailwater treatment system according to any one of claims 1 to 4, characterized in that: It comprises a disinfection device (81), an aeration tank (6) or a buffer tank (5) of the last group of biological treatment internal circulation small systems connected to the water inlet end of the disinfection device (81), and the tail water disinfected by the disinfection device (81) is discharged to the culture pond or the outside after aeration.

6. The aquaculture tailwater treatment system according to claim 5, characterized in that: The aeration tank (82) is connected to a water outlet of a disinfection device (81) and is used to receive tail water disinfected by the disinfection device (81).

7. The aquaculture tailwater treatment system according to claim 6, characterized in that: It includes an artificial wetland (83), which is connected to an aeration tank (82) and is used to receive tail water treated by aeration. The tail water of the artificial wetland (83) is finally discharged to a breeding pond or directly discharged to the outside.

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