Land-saving type aquaculture tail water treatment system

Abstract

The utility model relates to the technical field of aquaculture tail water treatment, and discloses a land-saving aquaculture tail water treatment system which comprises a purification channel, a grid water suction tank, a gravity type full-automatic dissolved oxygen fine filter and a biological filter which are sequentially arranged, and the purification channel is used for collecting aquaculture tail water in a sludge tank; the grid water suction tank is used for filtering and removing impurities from tail water discharged by the purification channel; the gravity type full-automatic dissolved oxygen fine filter is used for filtering the tail water treated by the grating water suction tank; the biological filter is communicated with the gravity type full-automatic dissolved oxygen fine filter and is used for absorbing and purifying tail water treated by the gravity type full-automatic dissolved oxygen fine filter. According to the scheme, the system is high in integration level, small in occupied area and relatively high in treatment efficiency; the gravity type full-automatic dissolved oxygen fine filter is arranged to filter tail water, so that the blockage of the biological filter is effectively avoided; the treated breeding tail water can be directly recycled or discharged, so that the environmental benefit is good.

Description

Technical Field

[0001] The utility model relates to the technical field of aquaculture tail water treatment, in particular to a land-saving aquaculture tail water treatment system. Background Art

[0002] Aquaculture tailwater refers to water in which, due to the metabolism and accumulation of excrement, feed residues, drug residues and other substances of fish and other organisms during the aquaculture process, the content of harmful substances such as ammonia nitrogen, nitrite, hydrogen sulfide in the water body increases, the water quality deteriorates, and has adverse effects on farmed organisms.

[0003] At present, the aquaculture tailwater is mainly treated through the "three pools and two dams" ecological treatment process, the three-stage filtration tailwater treatment mode and the shore-based integrated equipment tailwater treatment mode. "Three pools and two dams" is an ecological technology model for aquaculture tailwater treatment. It effectively treats aquaculture tailwater through the process of sedimentation tanks, aeration tanks, ecological purification tanks and two filtration dams to achieve the recycling of water resources and standard discharge. The three pools and two dams technology has a large water treatment capacity and high technical maturity; the inlet and outlet are separated, which can reduce the spread of water diseases, but PAC agents need to be added in the sedimentation tank stage, resulting in sludge increment; and the occupied area is large, which will occupy 8-10% of the total aquaculture area. The three-stage filtration tailwater treatment mode is a technical method for aquaculture tailwater treatment. It treats tailwater through a multi-stage filtration system to achieve the purpose of purification and recycling. The construction difficulty is not high and the maintenance is simple; it uses the water level difference to drain water and save electricity, but the overflow pipe at the bottom of the pond is easy to clog, and the filter material needs to be cleaned frequently, and the subsequent maintenance is more complicated. The shore-based integrated equipment tailwater treatment is an environmentally friendly technology that purifies aquaculture tailwater through a centralized treatment system. It reduces environmental pollution by recycling or discharging tailwater up to standard. The equipment occupies a small area, is easy to install and maintain, and has a daily tailwater discharge of 2-3m 3 ; Recirculating aquaculture can reduce the invasion of foreign diseases, but the equipment installation cost is high, the power consumption is high; and the sewage absorption capacity range is not wide; multiple water trucks are required to promote the flow of water. Utility Model Content

[0004] The utility model aims to provide a land-saving aquaculture tail water treatment system to solve the problems of large floor space, complex maintenance and high energy consumption faced by existing aquaculture tail water treatment methods.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a land-saving aquaculture tailwater treatment system, comprising: a purification channel, a grille water absorption tank, a gravity-type fully automatic dissolved oxygen fine filter and a biological filter tank arranged in sequence, the purification channel is used to collect aquaculture tailwater from a sludge tank; the grille water absorption tank is connected to the purification channel, and the grille water absorption tank is used to filter and remove impurities from the tailwater discharged from the purification channel; the gravity-type fully automatic dissolved oxygen fine filter is connected to the grille water absorption tank, and the gravity-type fully automatic dissolved oxygen fine filter is used to filter the tailwater treated by the grille water absorption tank; the biological filter tank is connected to the gravity-type fully automatic dissolved oxygen fine filter, and the biological filter tank is used to absorb and purify the tailwater treated by the gravity-type fully automatic dissolved oxygen fine filter.

[0006] The principle of this scheme is as follows: the tail water of the sludge pool (fish pond tail water) is collected by the purification channel and then enters the screen water absorption pool. The screen in the screen water absorption pool intercepts the suspended solid garbage and impurities in the water and some large particles of suspended matter to prevent these garbage, impurities and suspended matter from flowing into the subsequent units; the tail water treated in the screen water absorption pool is lifted to the gravity-type fully automatic dissolved oxygen fine filter. After the raw water reaches the top of the equipment, it automatically flows into the lower part through the composite graded filter material filter layer from top to bottom completely relying on its own weight after aeration and dissolved oxygen, and then is filtered, and the pollutants are intercepted layer by layer. The clean water is collected at the bottom and then rises to the upper clean water tank for collection before flowing out and entering the high-efficiency biological filter. After the tail water is treated by the gravity-type fully automatic dissolved oxygen fine filter and enters the biological filter, the pollutants in the tail water are consumed under the adsorption and decomposition of plants and microorganisms, and the sewage is purified. Finally, the sewage is discharged in compliance with the standards under the treatment of the high-efficiency biological filter.

[0007] The advantages of the technical solution of the present application are: high system integration, small footprint, and relatively high treatment efficiency; a gravity-type fully automatic dissolved oxygen fine filter is set up to filter the tail water, which effectively avoids the clogging of the biological filter tank; a grid water absorption tank is set up to effectively remove larger solid impurities and some suspended matter in the tail water, avoiding these garbage, impurities and suspended matter from flowing into subsequent units; the treated aquaculture tail water can be directly reused or discharged, which has good environmental benefits.

[0008] Preferably, the tail water treated in the grid water absorption tank is lifted to the gravity-type fully automatic dissolved oxygen fine filter through a submersible sewage pump and a fine filter inlet pipe. The water inflow of the entire system is controlled by a submersible pump, and the system flow is strictly controlled to ensure the water output effect.

[0009] Preferably, a water inlet electromagnetic flowmeter is provided on the water inlet pipe of the fine filter, so as to more accurately control the water inlet amount of the whole system.

[0010] Preferably, there are multiple gravity-type fully automatic dissolved oxygen fine filters, the fine filter outlet pipes of the gravity-type fully automatic dissolved oxygen fine filters are all connected to the biological filter tank, and the fine filter inlet pipes of the gravity-type fully automatic dissolved oxygen fine filters are all connected to the grid water absorption tank. Multiple gravity-type fully automatic dissolved oxygen fine filters are set up to speed up the treatment speed and efficiency of tail water.

[0011] Preferably, the backwash outlet pipe of the gravity-type fully automatic dissolved oxygen fine filter is connected to the sludge pool for recirculation and purification.

[0012] Preferably, the connection point between the purification channel and the sludge pool is located at the top of the sludge pool outlet weir, which can reduce the sludge entering the tail water of the purification channel and reduce the impact on the treatment efficiency of the entire system.

[0013] Preferably, the biofilter is provided with a plurality of filter modules, gaps are provided between the filter modules, an outlet channel is formed between the filter module and the biofilter, the filter module includes a biofilter layer and a water distribution device for adding tail water to the biofilter layer, the biofilter layer is provided with a plant layer, a covering layer, a sponge medium soil layer, a coarse sand layer, a gravel layer, a water blind pipe, a HDPE membrane, a sand and gravel cushion layer and a plain soil layer from top to bottom, the water blind pipe is connected to the outlet channel through a drain pipe, and a through hole is provided on the water blind pipe. The top layer of the biofilter is set as a plant layer to absorb and decompose pollutants, and no bacterial agent costs are required for later operation and maintenance. The biofilter can be harvested regularly without replanting.

[0014] Preferably, the water distribution device includes a second water distribution channel and a third water distribution channel, the second water distribution channel is located on both sides of the biological filtration layer, the second water distribution channel cooperates with baffles arranged on the other two sides of the biological filtration layer to protect the biological filtration layer, the third water distribution channel is connected to the second water distribution channel, both ends of the third water distribution channel are respectively fixed on the second water distribution channel at the corresponding ends, and a water distribution hole is arranged at the bottom of the third water distribution channel. The tail water is evenly distributed to the plant layer through the second water distribution channel and the third water distribution channel.

[0015] Preferably, it also includes a support column for supporting the third water distribution channel, and the support column is located in the biological filtration layer. The third water distribution channel is supported by the support column to avoid the problem that the middle part of the third water distribution channel is suspended in the air and is easy to break, which affects the tail water from entering the biological filtration layer.

[0016] Preferably, the grille water absorption pool is provided with an inlet channel, a grille channel and a water collection channel connected in sequence, a gate is provided at the connection between the inlet channel and the grille channel, and a rotary grille machine is provided in the grille channel. The recycling grille machine can effectively avoid the problem of the grille being blocked and affecting the treatment efficiency of the grille water absorption pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic structural diagram of an embodiment of the utility model.

[0018] Figure 2 It is a schematic structural diagram of a grid water absorption tank, a gravity-type fully automatic dissolved oxygen fine filter and a sludge tank according to an embodiment of the utility model.

[0019] Figure 3 It is a schematic diagram of the structure of the biological filter tank according to an embodiment of the utility model.

[0020] Figure 4 For the utility model embodiment Figure 3 AA direction cross-sectional diagram.

[0021] Figure 5 For the utility model embodiment Figure 4 A partial enlarged view of .

[0022] Figure 6 For the utility model embodiment Figure 3 BB direction cross-sectional diagram.

[0023] Figure 7 For the utility model embodiment Figure 6 A partial enlarged view of . DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The figure marks in the drawings of the specification include: purification channel 1, screen water absorption pool 2, water inlet channel 21, screen channel 22, water collection channel 23, gravity-type fully automatic dissolved oxygen fine filter 3, fine filter water inlet pipe 31, water inlet electromagnetic flowmeter 32, biological filter 4, biological filter layer 41, water blind pipe 411, drainage pipe 412, second water distribution channel 5, third water distribution channel 6, support column 7, submersible sewage pump 8.

[0026] Example:

[0027] Land-saving aquaculture tailwater treatment system, such as the attached Figure 1 As shown, it includes: a purification channel 1, a grid water absorption pool 2, a gravity-type fully automatic dissolved oxygen fine filter 3 and a biological filter 4 which are arranged in sequence.

[0028] The purification channel 1 is used for sedimentation, degradation and purification of the aquaculture tail water in the sludge pool (i.e., fish pond). The connection between the purification channel 1 and the sludge pool is located at the top of the sludge pool outlet weir, which can reduce the sludge entering the tail water of the purification channel 1 and reduce the impact on the treatment efficiency of the entire system. In this embodiment, the tail water in the sludge pool is transported to the purification channel 1 through a W-DN300-HDPE double-wall corrugated pipe.

[0029] The screen water absorption pool 2 is connected to the purification channel 1, and the screen water absorption pool 2 is used to filter and remove impurities from the tail water discharged from the purification channel 1. Figure 2 As shown, the grille water absorption pool 2 is provided with an inlet channel 21, a grille channel 22 and a water collection channel 23 which are connected in sequence. A gate is provided at the connection between the inlet channel 21 and the grille channel 22. A rotary grille machine is provided in the grille channel 22. The structure of the rotary grille machine includes a driving device, a frame, a sprocket, a chain, rake teeth, a dirt cleaning device and an elastic overload protection device, etc. The device is assembled into a rotary grille chain using a group of unique rake teeth. Driven by the motor reducer, the rake tooth chain performs a rotary motion in the opposite direction of the water flow. When the rake tooth chain runs to the upper part of the device, a relative self-cleaning motion is generated between each group of rake teeth through the guidance of the groove wheel and the curved rail. Most of the solid matter falls by gravity, and the other part relies on the reverse motion of the sweeper to clean up the debris stuck on the rake teeth. It can automatically and continuously intercept and remove various shapes of debris in the fluid, so as to effectively separate solids and liquids; it has high automation, high separation efficiency, low power consumption, no noise, good corrosion resistance, and can ensure continuous and stable operation even without supervision; it is equipped with an overload safety protection device, which can automatically shut down the machine when a failure occurs to avoid overloading of the equipment. The recycling grid machine can effectively avoid the problem of grid blockage affecting the efficiency of the grid water absorption pool.

[0030] Among them, a plurality of grille channels 22 are provided in the grille water absorption pool to improve the filtering efficiency of the grille water absorption pool. In this embodiment, two grille channels 22 are provided, and the two grille channels 22 are symmetrically arranged in the grille water absorption pool.

[0031] The surface of the water collection channel 23 is paved with a grid cover.

[0032] The gravity-type fully automatic dissolved oxygen fine filter 3 is connected to the grid water absorption tank, and the gravity-type fully automatic dissolved oxygen fine filter 3 is used to filter the tail water after being treated by the grid water absorption tank. The working principle of gravity type fully automatic dissolved oxygen fine filter 3 (gravity type valveless filter) is as follows: Raw water filtration process: clean water after sedimentation or clarification enters the siphon riser through the water distribution tank and U-shaped pipe, and is evenly distributed to the filter material layer by the baffle. The water is filtered through the filter material layer from top to bottom. The filtered water is collected by the small resistance water distribution device and enters the clean water area (i.e., the water outlet tank) for storage. When the water level rises to the water outlet pipe, the filtered water flows to the clean water tank by gravity; Backwashing process: As the filtration time goes by, the particle impurities on the surface of the filter layer gradually increase, and the head loss also increases, which causes the water level in the siphon to continue to rise. When the head loss reaches a certain level, the water level in the siphon rises to the siphon auxiliary pipe mouth and flows down rapidly, taking away the air in the siphon down pipe, forming a siphon effect, and starting the backwashing process; Siphon destruction and filtration restart: When the water level in the flushing water tank drops to the siphon destruction pipe, air enters the siphon, destroys the siphon effect, the backwashing ends, and the filtration restarts.

[0033] The tail water treated in the screen water absorption pool 2 is lifted to the gravity-type fully automatic dissolved oxygen fine filter 3 through the submersible sewage pump 8 and the fine filter water inlet pipe 31. The water inflow of the whole system is controlled by the submersible pump, and the system flow is strictly controlled to ensure the water output effect. The fine filter water inlet pipe 31 passes through the screen cover and is located at the bottom of the water collection channel 23. The fine filter water inlet pipe 31 is provided with a water inlet electromagnetic flowmeter 32, and the water inlet electromagnetic flowmeter 32 is used to more accurately control the water inflow of the whole system.

[0034] There are multiple gravity-type fully automatic dissolved oxygen fine filters 3, and the fine filter outlet pipes of the gravity-type fully automatic dissolved oxygen fine filters 3 are all connected to the biological filter 4, and the fine filter inlet pipes 31 of the gravity-type fully automatic dissolved oxygen fine filters 3 are all connected to the grid water absorption pool 2. Multiple gravity-type fully automatic dissolved oxygen fine filters 3 are set to speed up the treatment speed and treatment efficiency of the tail water. In this embodiment, three gravity-type fully automatic dissolved oxygen fine filters 3 are specifically set, and the model can be W-DN600-CS.

[0035] Among them, the backwash outlet pipe of the gravity-type fully automatic dissolved oxygen fine filter 3 is connected to the sludge tank for circulation and purification again.

[0036] Among them, the sludge filtered out by the gravity-type fully automatic dissolved oxygen fine filter 3 is regularly extracted and transported to a third-party solid waste qualified unit for disposal or piled on the pond embankment on site after sedimentation treatment in the sludge pool.

[0037] The biological filter 4 is connected to the gravity-type fully automatic dissolved oxygen fine filter 3, and the biological filter 4 is used to absorb and purify the tail water treated by the gravity-type fully automatic dissolved oxygen fine filter 3. Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 and attached Figure 7 As shown, a plurality of filter modules are provided in the biological filter 4. In this embodiment, a total of 6 filter modules are provided. There are gaps between the filter modules. An outlet channel is formed between the filter modules and the biological filter 4. The filter module includes a biological filter layer 41 and a water distribution device for adding tail water to the biological filter layer 41. The biological filter layer 41 is provided with a plant layer, a covering layer, a sponge medium soil layer, a coarse sand layer, a gravel layer, a water blind pipe 411, a HDPE membrane, a sand and gravel cushion layer and a plain soil layer from top to bottom. The water blind pipe 411 is connected to the outlet channel through a drain pipe 412, and a through hole is provided on the water blind pipe 411. In this embodiment, the drain pipe 412 is an L-shaped PVC pipe. This scheme utilizes the synergistic effect of the inner matrix, plants and microorganisms, and the pollutants are consumed under the adsorption and decomposition of plants and microorganisms, and the sewage is purified. Finally, the sewage meets the discharge standards under the treatment of the high-efficiency biological filter 4. The top layer of the biological filter 4 is set as a plant layer to absorb and decompose pollutants. No bacterial agent costs are required for later operation and maintenance. The biological filter 4 can be harvested regularly without replanting.

[0038] The water distribution device includes a second water distribution channel 5 and a third water distribution channel 6. The second water distribution channel 5 is located on both sides of the biological filter layer 41. The baffles arranged on the other two sides of the second water distribution channel 5 and the biological filter layer 41 cooperate to protect the biological filter layer 41. The third water distribution channel 6 is connected to the second water distribution channel 5. The two ends of the third water distribution channel 6 are respectively fixed on the second water distribution channel 5 at the corresponding ends, specifically fixed by expansion bolts. A water distribution hole is provided at the bottom of the third water distribution channel 6. The tail water is evenly distributed in the plant layer through the second water distribution channel 5 and the third water distribution channel 6. The sewage enters the second water distribution channel 5 of the biological filter tank 4, and then evenly distributes water through the third water distribution channel 6 of the next level. Among them, the second water distribution channel 5 includes a bottom plate and a square groove. The bottom plate and the baffle cooperate to protect the biological filter layer 41. The bottom of the square groove is higher than the top of the third water distribution channel 6. The third water distribution channel 6 is a PVC pipe, and an opening is made at its bottom to form a water distribution hole. A second water distribution channel 5 may be arranged in the middle of the biological filtration layer 41 and connected to the corresponding third water distribution channel 6 so that the tail water is evenly distributed to the plant layer.

[0039] The third water distribution channel 6 is also provided with a support column 7, which is located in the biological filter layer 41. The third water distribution channel 6 is supported by the support column 7 to avoid the problem that the middle part of the third water distribution channel 6 is suspended in the air and is easy to break, which affects the tail water from entering the biological filter layer 41.

[0040] The specific implementation process is as follows:

[0041] The tail water of the fish pond is collected by the primary purification channel 1 and flows into the screen water absorption pool 2. The screen water absorption pool 2 passes through the rotating screen and intercepts the suspended solid garbage and impurities in the water as well as some large particles of suspended matter, so as to prevent these garbage, impurities and suspended matter from flowing into the subsequent units.

[0042] The water inlet pipe 31 of the fine filter passes through the grille cover plate on the surface of the water collection channel 23 of the grille water absorption tank 2 and is located at the bottom of the water collection channel 23. The water discharged from the grille water absorption tank 2 is lifted to the gravity-type fully automatic dissolved oxygen fine filter 3 by the submersible sewage pump 8. After the raw water reaches the top of the equipment, it automatically flows into the lower part from top to bottom by aeration and dissolved oxygen completely relying on its own weight, and then passes through the composite graded filter material filter layer for filtration, intercepting pollutants layer by layer, and the clean water gathers at the bottom and then rises to the upper clean water tank for gathering before flowing out and finally entering the biological filter tank 4.

[0043] The sewage enters the second water distribution tank of the biological filter 4, and then evenly distributes water through the third water distribution tank of the next level. The tail water is evenly distributed in the sponge medium soil under the action of gravity. An artificial water ecosystem is established in the biological filter 4. By utilizing the synergistic effect of the internal matrix, plants and microorganisms, the pollutants are consumed by the adsorption and decomposition of plants and microorganisms, and the sewage is purified. Finally, the sewage is treated in the high-efficiency biological filter 4 and meets the discharge standards.

[0044] The sludge filtered out by the fine filter is treated by sedimentation in the sludge pool, and then regularly extracted and transported to a third-party solid waste qualified unit for disposal or piled up on the pond embankment on site.

[0045] This solution can greatly improve the removal efficiency of suspended matter through the oxygenation and filtration effect of the gravity-type fully automatic dissolved oxygen fine filter 3, while replenishing the oxygen content of the water body to pave the way for subsequent treatment units; the biological filter 4 also has the function of an artificial wetland. While degrading organic matter, it utilizes the nitrification and denitrification effects of microorganisms and the absorption of nitrogen and phosphorus by aquatic plants to fully remove nitrogen and phosphorus nutrients in the water body, reduce the pollution indicators of the water body, and greatly save facility land; green circulation: the tailwater treatment facility has two outlets, on the one hand, it can discharge qualified water bodies in time, and on the other hand, it can recycle the treated water bodies; energy saving: the high-power equipment of the entire tailwater treatment system is three lifting pumps, and the flow between the treatment units is achieved by gravity self-flow, which greatly saves energy consumption and achieves sustainable operation.

[0046] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical schemes and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the technical scheme of the utility model. In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The land-saving aquaculture tailwater treatment system is characterized by: include: A purification channel, a screen water absorption pool, a gravity-type fully automatic dissolved oxygen fine filter and a biological filter are arranged in sequence, wherein the purification channel is used to collect aquaculture tail water from the sludge pool; The grille water absorption tank is connected to the purification channel, and the grille water absorption tank is used to filter and remove impurities from the tail water discharged from the purification channel; the gravity-type fully automatic dissolved oxygen fine filter is connected to the grille water absorption tank, and the gravity-type fully automatic dissolved oxygen fine filter is used to filter the tail water treated by the grille water absorption tank; the biological filter is connected to the gravity-type fully automatic dissolved oxygen fine filter, and the biological filter is used to absorb and purify the tail water treated by the gravity-type fully automatic dissolved oxygen fine filter.

2. The land-saving aquaculture tailwater treatment system according to claim 1 is characterized in that: The tail water treated in the grid water absorption tank is lifted to the gravity-type fully automatic dissolved oxygen fine filter through a submersible sewage pump and a fine filter water inlet pipe.

3. The land-saving aquaculture tailwater treatment system according to claim 2 is characterized in that: A water inlet electromagnetic flowmeter is arranged on the water inlet pipe of the fine filter.

4. The land-saving aquaculture tailwater treatment system according to claim 2 is characterized in that: There are multiple gravity-type fully automatic dissolved oxygen fine filters, the fine filter outlet pipes of the gravity-type fully automatic dissolved oxygen fine filters are all connected to the biological filter tank, and the fine filter inlet pipes of the gravity-type fully automatic dissolved oxygen fine filters are all connected to the grille water absorption tank.

5. The land-saving aquaculture tailwater treatment system according to claim 4 is characterized in that: The fine filter backwash outlet pipe of the gravity-type fully automatic dissolved oxygen fine filter is connected to the sludge tank.

6. The land-saving aquaculture tailwater treatment system according to claim 1, characterized in that: The connection point between the purification channel and the sludge pool is located at the top of the sludge pool outlet weir.

7. The land-saving aquaculture tailwater treatment system according to claim 1 is characterized in that: A plurality of filter modules are arranged in the biofilter, gaps are arranged between the filter modules, an outlet channel is formed between the filter module and the biofilter, the filter module comprises a biofilter layer and a water distribution device for adding tail water to the biofilter layer, the biofilter layer is provided with a plant layer, a covering layer, a sponge medium soil layer, a coarse sand layer, a gravel layer, a water blind pipe, a HDPE membrane, a sand and gravel cushion layer and a plain soil layer from top to bottom, the water blind pipe is connected with the outlet channel through a drainage pipe, and a through hole is arranged on the water blind pipe.

8. The land-saving aquaculture tailwater treatment system according to claim 7 is characterized in that: The water distribution device includes a second water distribution channel and a third water distribution channel. The second water distribution channel is located on both sides of the biological filtration layer. The second water distribution channel and the baffles arranged on the other two sides of the biological filtration layer cooperate to protect the biological filtration layer. The third water distribution channel is connected to the second water distribution channel. Both ends of the third water distribution channel are respectively fixed on the second water distribution channels at the corresponding ends. A water distribution hole is arranged at the bottom of the third water distribution channel.

9. The land-saving aquaculture tailwater treatment system according to claim 8, characterized in that: The utility model also comprises a supporting column for supporting the third water distribution channel, wherein the supporting column is located in the biological filtration layer.

10. The land-saving aquaculture tailwater treatment system according to claim 1, characterized in that: The grille water absorption pool is provided with a water inlet channel, a grille channel and a water collection channel which are connected in sequence, a gate is provided at the connection between the water inlet channel and the grille channel, and a rotary grille machine is provided in the grille channel.

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