CN211664906U - Aquaculture tail water treatment device based on suspended filler biofilm technology - Google Patents

Abstract

The utility model discloses an aquaculture tail water processing apparatus based on suspension filler biomembrane technique, including the reactor main part, set gradually according to the sewage treatment flow in the reactor main part and be arranged in reducing the denitrification system of total nitrogen volume in the waste water, be arranged in getting rid of the good oxygen biochemical system of organic matter in the waste water, be used for getting rid of the nitrification system of ammonia nitrogen in the waste water, the nitrification system carries the waste water of the completion of nitrifying system in through reflux unit and carries to the denitrification system and further handle, the utility model discloses endogenetic material concentration is high, and waste water dwell time is short, and area is little, easy operation, equipment need not the back flush, does not have the mud backward flow, maintains the demand and hangs down, and shock-resistant load operates steadily.

Description

Aquaculture tail water treatment device based on suspended filler biofilm technology

technical field

The utility model relates to a sewage treatment device, in particular to an aquaculture tail water treatment device based on the suspended filler biofilm technology with high efficiency, environmental protection and good treatment effect, and belongs to the technical field of sewage treatment.

Background technique

Aquaculture is an important part of agricultural production and plays an important role in the national economy. In the past 20 years, the factory-intensive aquaculture industry with high utilization of land resources and water resources has developed rapidly. In the process of aquaculture, toxic and harmful organic matter such as residual bait, plankton metabolites, and excrement of farmed animals will accumulate in the aquaculture water body. When the organic matter content in the water body is too high, the water body will deteriorate, resulting in slow growth or even death of fish. Or flooding the pool, affecting the quality of aquatic products.

In view of the above factors, in the process of intensive factory aquaculture, it is necessary to regularly discharge tail water containing toxic and harmful substances to ensure the healthy growth of fish, shrimp and shellfish and other aquaculture objects. However, in the current aquaculture mode, the tail water is usually discharged without treatment or after simple treatment, while the excrement, residual bait, bait, bait and waste of aquatic animals in the tail water are discharged. Ammonia nitrogen compounds, nitrites, dissolved organic matter, suspended solids (SS) and pathogens produced by the decomposition of nitrogen-containing organic matter such as feces, animal and plant carcasses can easily cause eutrophication of surrounding water bodies and damage the natural environment.

In order to solve the above problems, the current domestic and foreign treatment technologies for aquaculture tail water mainly include physical treatment technology, physical chemical treatment technology and biological treatment technology; the material treatment technology mainly includes adsorption and filtration, and adsorption mainly uses filter materials with different pore sizes. Absorb impurities in the tail water to keep the water clean, while filtration mainly intercepts and removes large particles of organic matter and residual bait feces in the tail water to keep the water clean; adsorption and filtration and other treatment methods can remove 80% of the metabolism in the aquaculture tail water. Products and other pollutants, but the removal effect of fine-grained organic matter and dissolved organic matter is very poor. At the same time, the physical treatment technology has the problems of poor treatment effect and incomplete water purification, which may easily lead to excessive effluent.

The chemical treatment technology is mainly water flow disinfection, with the main goal of killing pathogenic microorganisms in the water body. At present, ozone disinfection is mainly used. Ozone can effectively oxidize ammonia nitrogen and various reducing pollutants accumulated in tail water, reduce COD concentration, purify water quality and optimize aquaculture environment. However, while ozone kills pathogenic microorganisms in the tail water, it also kills beneficial bacteria together, which reduces the treatment effect. In addition, ozone disinfection treatment also has low ozone utilization, insufficient oxidation capacity, high one-time investment costs, and large operating costs. Therefore, its application in aquaculture tail water treatment is limited.

The biological treatment technology mainly includes artificial wetlands, adding high-efficiency biological agents and microbial solidification technology. A comprehensive sewage purification system constructed has the advantages of low operating cost, easy maintenance, and shock load resistance. However, constructed wetlands are easily disturbed by natural and human activities, and are easily blocked, resulting in the destruction of ecological balance, and the existence of The land area is large, the technical content is low, the effluent is not easy to meet the standard, and it is easy to cause secondary pollution and other shortcomings.

The technology of adding high-efficiency microbial inoculants is to increase the biomass by adding high-efficiency microbial inoculants to the aquaculture tail water and strengthen the ability of the biological treatment system to remove the target pollutants. This method is not used alone, but is usually used as an auxiliary and strengthening means.

Microbial immobilization technology is an emerging biotechnology developed in the 1960s. This technology uses physical or chemical measures to locate free microbial cells or enzymes in a limited space area and keep them active for repeated use. It has the advantages of strong stability, easy reaction control, strong tolerance to the environment, and maintaining high efficiency of bacterial species. Currently, the commonly used bioimmobilization methods mainly include adsorption method, embedding method, cross-linking method and covalent binding method. However, this technology is mainly in the experimental research stage at present, and there are still many problems in practical application, such as the research on the purification mechanism of immobilized microorganisms, its preservation, and mass production has not been perfected.

Therefore, the development of an efficient, environmentally friendly and effective aquaculture tail water treatment method has important practical significance for the healthy and sustainable development of aquaculture in my country.

Utility model content

The main technical problem to be solved by the utility model is to provide a method for treating aquaculture tail water, ensuring that the effluent discharge meets the standard, and even realizes zero discharge of tail water, realizes the recycling of water resources, and reduces the pollution of tail water discharge to the surrounding environment. The aquaculture tail water treatment device based on the suspended filler biofilm technology, which saves water resources and has good environmental and economic benefits.

In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions:

The aquaculture tail water treatment device based on the suspended filler biofilm technology includes a reactor main body. The reactor main body is sequentially provided with a denitrification system for reducing the total nitrogen in the wastewater according to the sewage treatment process. An oxygen biochemical system and a nitrification system for removing ammonia nitrogen in wastewater, the nitrification system transports the wastewater treated in the nitrification system to a denitrification system through a reflux device for further treatment.

The following is the further optimization of the present invention to the above-mentioned technical scheme:

The denitrification system includes a pre-denitrification tank, the pre-denitrification tank is filled with denitrification fillers, and the pre-denitrification tank is provided with agitation waste water and denitrification fillers and can accumulate suspended solids and aging organisms on the surface of the fillers. Agitated flushing device for membrane flushing.

Further optimization: the denitrification filler includes a suspension filler filled in the pre-denitrification tank and denitrification bacteria attached to the suspension filler.

Further optimization: a bottom water distribution pipe is fixedly arranged at the bottom of the front denitrification tank, and the water inlet end of the bottom water distribution pipe is connected to the water inlet valve arranged at the water inlet of the front denitrification tank through a pipeline.

Further optimization: the stirring and washing device includes a hyperboloid agitator, and the stirring blade at the lower end of the hyperboloid agitator is placed in the front denitrification tank, and the front denitrification tank is also provided with a forward flushing pipe, and the forward flushing The intake end of the pipe is communicated with a fan arranged outside the front denitrification tank.

Further optimization: the aerobic biochemical system includes an aerobic tank, the aerobic tank is communicated with the denitrification tank through the denitrification tank interception filler flow device, the aerobic tank is filled with aerobic fillers and is provided with a Aeration components for aeration in the pool.

Further optimization: the denitrification tank interception filler circulation device includes a denitrification tank outlet interception screen set in the denitrification tank near the upper end, and the outlet end of the denitrification tank outlet interception screen is connected to the aerobic tank inlet water through a diversion pipe The bottom water distribution pipe is arranged at the bottom of the aerobic tank.

Further optimization: the aerobic fillers include suspended fillers filled in the aerobic tank and aerobic microorganisms attached to the suspended fillers.

Further optimization: the nitrification system includes a nitrification tank, the nitrification tank is communicated with the aerobic tank through the aerobic tank intercepting filler circulation device, and the nitrification tank is filled with nitrification fillers.

Further optimization: the return device includes a return pipeline arranged between the nitrification tank and the denitrification tank, a return pump is arranged in series on the return pipeline, and the water inlet end of the return pipeline is connected with a nitrification tank outlet intercepting screen arranged in the nitrification tank The outlet end of the return line is connected to the water inlet of the bottom water distribution pipe in the front denitrification tank.

The utility model adopts the above-mentioned technical scheme, and has the following beneficial effects:

(1) The aquaculture tail water treatment device has high biomass concentration, short residence time and small footprint. Using this treatment device to treat wastewater, the biological concentration of the aeration tank is as high as 10-15g/L. Under the same load conditions The volume of the lower equipment is reduced by more than 60% compared with the traditional activated sludge, 25% compared with the MBBR process, and the secondary sedimentation tank is reduced, and the effluent effect is obvious.

(2) The operation is simple, the equipment does not need backwashing, there is no sludge backflow, and the maintenance requirement is low. The aeration system and screen in the pool have automatic cleaning function, no backwashing is required, and the operation is simple.

(3) It is resistant to impact load, stable operation, strong tolerance to load and temperature changes, no sludge expansion problem, and can still operate stably under the condition of influent load changes.

(4) The film hanging time is short and the treatment effect is high. Compared with the traditional activated sludge method, the film hanging time is reduced by 80%, and the treatment efficiency is increased by more than 30%. It can effectively remove COD, ammonia nitrogen, total nitrogen, suspended solids, etc. in the wastewater. .

(5) The mass transfer effect is good, the oxygen utilization rate is high, and the operating cost is low. Because the filler in the reactor is in a fluidized state, the transmission rate between the oxygen and the biofilm is greatly improved. The oxygen transmission rate in the reactor is the same as that of the MBBR reactor. Twice the oxygen utilization rate, thereby greatly improving the oxygen utilization rate and reducing the energy consumption and cost of sewage treatment.

(6) The one-time investment is low, the configuration is flexible, and the installation is convenient. The overall equipment is designed as a single stage or the entire processing system is designed as a module. The modular design makes the equipment easy to transport and install on site. In addition, according to different water quality requirements, the number of stages can be flexibly selected for combination, and more fillers can be added within a certain range to improve the processing capacity of the equipment.

The utility model is further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

In the figure: 1-water inlet valve; 2-front denitrification tank; 3-outlet interception screen of denitrification tank; 4-forward flushing pipe; 5-hyperboloid mixer; 6-bottom water distribution pipe; 7-good Oxygen tank outlet interception screen; 8-aerobic tank; 9-aerobic tank inlet bottom water pipe; 10-aeration pipe of aerobic tank; 11-nitrification tank outlet interception screen; 12-nitrification tank; 13-nitrification Water distribution pipe at the bottom of the pool; 14- nitrification tank aeration pipe; 15- water outlet pipe; 16- return line; 17- return pump; 18- fan; 19- reactor main body.

Detailed ways

Example: As shown in FIG. 1, an aquaculture tail water treatment device based on the suspended filler biofilm technology includes a reactor main body 19, and the reactor main body 19 is arranged in sequence according to the sewage treatment process to reduce the total nitrogen in the sewage. A denitrification system, an aerobic biochemical system for removing organic matter in sewage, and a nitrification system for removing ammonia nitrogen in sewage, the nitrification system transports the treated sewage in the nitrification system to the denitrification system for further treatment through a reflux device .

The denitrification system includes a pre-denitrification tank 2, the pre-denitrification tank 2 is filled with denitrification fillers, and the pre-denitrification tank 2 is provided with fillers for stirring sewage and denitrification and capable of Agitator flushing device for flushing accumulated suspended solids and aged biofilm on the surface.

The denitrification fillers include suspension fillers filled in the pre-denitrification tank 2 and denitrification bacteria attached to the suspension fillers.

The suspended filler is in the form of particles with uniform size and shape made of HDPE material, and the suspended filler has a honeycomb surface.

This design can make the suspended filler have a large surface area and a high porosity, which is conducive to the attachment of microorganisms. Therefore, the concentration of microorganisms in the pre-denitrification tank 2 can be significantly increased. At the same time, the material of the suspended filler is HDPE, so that the suspended filler has High hardness, not easy to be damaged in the process of sewage treatment.

A bottom water distribution pipe 6 is fixedly arranged at the bottom of the front denitrification tank 2 , and the water inlet end of the bottom water distribution pipe 6 communicates with the water inlet valve 1 arranged at the water inlet of the front denitrification tank 2 through a pipeline.

The bottom water distribution pipe 6 is evenly provided with a plurality of openings at annular intervals. This design can achieve uniform water distribution and then control the water flow speed, preventing the high impact load caused by the high sewage flow rate from affecting the front denitrification tank 2. The content of internal denitrifying bacteria ensures the treatment effect of sewage.

The stirring and washing device includes a hyperboloid agitator 5, which is driven by a power drive device, and the stirring blade at the lower end of the hyperboloid agitator 5 is placed in the front denitrification tank 2, and is used before stirring. The sewage in the denitrification tank 2 is placed so that the denitrifying bacteria attached to the filler are fully contacted with the sewage.

The hyperboloid agitator 5 is in the prior art, and includes a power drive device to drive and a stirring blade, and the power drive device outputs power to drive the stirring blade to rotate.

In this way, the hyperboloid agitator 5 is used to agitate the sewage and the suspended filler in the front denitrification tank 2, so that the sewage can fully contact the denitrifying bacteria attached to the filler, and then the nitrate in the sewage is denitrified by the denitrifying bacteria. The nitrogen is converted into nitrogen and discharged into the atmosphere to reduce the TN (total nitrogen content) in the water, and the stirring blade of the hyperboloid agitator 5 is hyperboloid design so that the agitator 5 will not break the filler during operation.

The front denitrification tank 2 is also provided with a forward flushing pipe 4. The forward flushing pipe 4 is evenly provided with a plurality of openings at annular intervals. The gas pipe communicates with the fan 18 arranged outside the front denitrification tank 2 .

This design allows positive flushing of a large amount of suspended solids accumulated in the system after a period of operation.

During flushing, all the fillers in the pre-denitrification tank 2 are in a fluidized state. Under the collision of the water flow and the suspended fillers, the suspended solids and aged biofilm accumulated on the surface of the suspended fillers fall off and are discharged from the system along with the flushing. Membrane gets updated.

The aerobic biochemical system includes an aerobic tank 8, which is communicated with the pre-denitrification tank 2 through a denitrification tank interception filler flow device, and the aerobic tank 8 is filled with aerobic fillers and provided with useful The aeration component used for aeration in the aerobic tank 8.

The denitrification tank interception filler circulation device includes a denitrification tank outlet interception screen 3 disposed in the front denitrification tank 2 near the upper end, and the outlet end of the denitrification tank outlet interception screen 3 is connected with a diversion pipe through a diversion pipe. The water distribution pipe 9 at the bottom of the water inlet of the aerobic pool is arranged at the bottom of the aerobic pool 8 .

The denitrification tank effluent interception screen 3 is used to intercept the suspended filler in the pre-denitrification tank 2 to avoid the loss of the filler, and then only the treated sewage in the pre-denitrification tank 2 passes through the denitrification tank effluent interception screen The net 3 and the guide pipe enter into the water distribution pipe 9 at the bottom of the water inlet of the aerobic tank, so that the treated sewage in the front denitrification tank 2 can be transported to the aerobic tank 8 .

The water distribution pipe 9 at the bottom of the water inlet of the aerobic pool is evenly provided with a plurality of openings at annular intervals. This design can achieve uniform water distribution and control the water flow speed, preventing the high impact load caused by the high sewage flow rate. The content of aerobic microorganisms in the oxygen tank 8 ensures the treatment effect of sewage.

The aerobic fillers include suspended fillers filled in the aerobic tank 8 and aerobic microorganisms attached to the suspended fillers.

The suspended filler is in the form of particles with uniform size and shape made of HDPE material, and the suspended filler has a honeycomb surface.

This design can make the suspended filler have a large surface area and a high porosity, which is conducive to the attachment of aerobic microorganisms. Therefore, the concentration of aerobic microorganisms in the aerobic tank 8 can be significantly increased. The filler has high hardness and is not easy to be damaged in the process of sewage treatment.

The aeration assembly includes an aerobic tank aeration pipe 10 arranged at the bottom of the aerobic tank 8 , and the intake end of the aerobic tank aeration pipe 10 is communicated with the fan 18 through an air duct.

The aeration pipe 10 of the aerobic pool is evenly provided with a plurality of air outlets at annular intervals, and the output air flow of the fan 18 is transported into the aeration pipe 10 of the aerobic pool through the air guide pipe, and passes through the aeration pipe 10 of the aerobic pool. The air outlet opened on the upper part transports the airflow into the aerobic tank 8 to realize bottom aeration in the aerobic tank 8 .

This design can reduce the loss of aeration resistance and solve the blockage problem of traditional aeration pipes. At the same time, the traditional aeration method is transformed into linear aeration, which makes the aeration more uniform, and the vertical circulation formed makes the stirring and mixing more uniform. , to improve oxygen utilization and power efficiency.

The output air flow of the fan 18 aerates the aerobic tank 8 through the guide pipe and the aerobic tank aeration pipe 10 to provide oxygen for the aerobic microorganisms, and then the aerobic microorganisms decompose the organic matter in the sewage in the aerobic environment. and reduce COD content in sewage.

The nitrification system includes a nitrification tank 12, and the nitrification tank 12 is communicated with the aerobic tank 8 through the aerobic tank intercepting filler flow device, and the nitrification tank 12 is filled with nitrification fillers.

The aerobic tank interception filler circulation device includes an aerobic tank outlet interception screen 7 arranged in the aerobic tank 8 close to the top, and the outlet end of the aerobic tank outlet interception screen 7 is communicated with a nitrification tank through a guide pipe. Bottom water distribution pipe 13 , the bottom water distribution pipe 13 of the nitrification tank is arranged at the bottom of the nitrification tank 12 .

The aerobic tank effluent interception screen 7 is used to intercept the suspended filler in the aerobic tank 8 to avoid the loss of the filler, and then only the treated sewage in the aerobic tank 8 passes through the aerobic tank effluent interception screen 7 and guide. The flow pipe enters into the water distribution pipe 13 at the bottom of the nitrification tank, so that the treated sewage in the aerobic tank 8 is transported to the nitrification tank 12 .

The water distribution pipe 13 at the bottom of the nitrification tank is evenly spaced with a plurality of openings at annular intervals. This design can achieve uniform water distribution and control the flow velocity of the water, preventing the high impact load caused by the high flow rate of sewage from affecting the nitrification tank 12. The content of denitrifying bacteria ensures the treatment effect of sewage.

The nitrifying fillers include suspended fillers filled in the nitrification tank 12 and nitrifying bacteria attached to the suspended fillers.

The suspended filler is in the form of particles with uniform size and shape made of HDPE material, and the suspended filler has a honeycomb surface.

A nitrification tank aeration pipe 14 is arranged at the bottom of the nitrification tank 12 , and the intake end of the nitrification tank aeration pipe 14 is communicated with the fan 18 through an air guide pipe.

The nitrification tank aeration pipe 14 is evenly provided with a plurality of air outlet holes at annular intervals, and the output air flow of the fan 18 is transported into the nitrification tank aeration pipe 14 through the air guide pipe, and passes through the nitrification tank aeration pipe 14. The air outlet conveys the airflow into the nitrification tank 12 to realize bottom aeration in the nitrification tank.

This design can reduce the loss of aeration resistance and solve the blockage problem of traditional aeration pipes. At the same time, the traditional aeration method is transformed into linear aeration, which makes the aeration more uniform, and the vertical circulation formed makes the stirring and mixing more uniform. , to improve oxygen utilization and power efficiency.

The return device includes a return line 16 arranged between the nitrification tank 12 and the denitrification tank 2, a return pump 17 is arranged in series on the return line 16, and the water inlet end of the return line 16 is connected with nitrification. The effluent intercepting screen 11 of the nitrification tank is arranged at a position close to the upper part of the nitrification tank 12 .

The outlet end of the return line 16 is connected to the water inlet of the bottom water distribution pipe 6 in the front denitrification tank 2 .

In this way, part of the sewage that does not meet the standard in the nitrification tank 12 can be returned to the pre-denitrification tank 2 to further remove the organic matter, ammonia nitrogen and total nitrogen in the sewage.

The return line 16 is provided with a water outlet pipe 15 at a position close to the return pump 17, and the water outlet pipe 15 is used to discharge the sewage that has been treated up to the standard.

The utility model adopts the above-mentioned technical scheme. When in use, the sewage to be treated enters the front denitrification tank 2 through the pipeline installed with the water inlet valve 1 through the lifting pump, the hyperboloid agitator 5 is opened, and the adhering to the The microorganisms on the filler are fully contacted with the sewage; then the nitrate nitrogen in the sewage is converted into nitrogen gas by denitrifying bacteria and discharged into the atmosphere to achieve the purpose of reducing the TN (total nitrogen content) in the water.

After the pre-denitrification tank 2 has been running for a period of time, the air intake of the forward flushing pipe 4 and the working efficiency of the hyperboloid agitator 5 are increased, and a large amount of suspended solids accumulated in the pre-denitrification tank 2 are forwardly flushed, and at the same time Under the collision of water flow and filler, the aging biofilm is renewed.

The sewage treated by the front denitrification tank 2 is filtered by the denitrification tank effluent interception screen 3 and enters the aerobic tank 8 through the water distribution pipe 9 at the bottom of the aerobic tank inlet, and the airflow output by the fan 18 passes through the aerobic tank 8. Under the action of the aeration pipe 10 of the oxygen tank, the vertical circulation formed in the aerobic tank 8 makes the filler and sewage more uniformly stirred and mixed, so that the organic matter can be fully decomposed and the biofilm can be renewed.

The sewage treated by the aerobic tank 8 is filtered by the aerobic tank outlet intercepting screen 7 and enters the nitrification tank 12 through the water distribution pipe 13 at the bottom of the nitrification tank. The treated sewage that meets the standard is discharged through the water outlet pipeline 15. The sewage is returned to the front denitrification tank 2 by the drive of the return pump 17 for further treatment.

The utility model adopts the above technical scheme, the biomass concentration in the reactor is high, the residence time is short, and the floor area is small. Using the treatment device to treat the sewage, the biological concentration of the aeration tank is as high as 10-15g/L, and under the same load condition The volume of the lower equipment is reduced by more than 60% compared with the traditional activated sludge, 25% compared with the MBBR process, and the secondary sedimentation tank is reduced, and the effluent effect is obvious.

(2) The operation is simple, the equipment does not need backwashing, there is no sludge backflow, and the maintenance requirement is low. The aeration system and screen in the pool have automatic cleaning function, no backwashing is required, and the operation is simple.

(3) It is resistant to impact load, stable operation, strong tolerance to load and temperature changes, no sludge expansion problem, and can still operate stably under the condition of influent load changes.

(4) The film hanging time is short and the treatment effect is high. Compared with the traditional activated sludge method, the film hanging time is reduced by 80%, and the treatment efficiency is increased by more than 30%. It can effectively remove COD, ammonia nitrogen, total nitrogen, suspended solids, etc. .

(5) The mass transfer effect is good, the oxygen utilization rate is high, and the operating cost is low. Because the filler in the reactor is in a fluidized state, the transmission rate between the oxygen and the biofilm is greatly improved. The oxygen transmission rate in the reactor is the same as that of the MBBR reactor. Twice the oxygen utilization rate, thereby greatly improving the oxygen utilization rate and reducing the energy consumption and cost of sewage treatment.

(3) The one-time investment is low, the configuration is flexible, and the installation is convenient. The overall equipment can be designed as a single stage or the entire processing system can be designed as a module. The modular design makes the equipment easy to transport and install on site. In addition, according to different water quality requirements, the number of stages can be flexibly selected for combination, and more fillers can be added within a certain range to improve the processing capacity of the equipment.

For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principle and spirit of the present invention, changes, modifications, substitutions and alterations to the embodiments still fall within the scope of the present invention within the scope of protection.

Claims (7)

1. An aquaculture tail water treatment device based on suspended filler biofilm technology, comprising a reactor main body (19), characterized in that: the reactor main body (19) is sequentially provided with a sewage treatment process for reducing total nitrogen in wastewater. A large amount of denitrification system, an aerobic biochemical system for removing organic matter in wastewater, and a nitrification system for removing ammonia nitrogen in wastewater, the nitrification system transports the wastewater treated in the nitrification system to the denitrification system through a reflux device for further processing. deal with; The denitrification system includes a pre-denitrification tank (2), the pre-denitrification tank (2) is filled with denitrification fillers, and the pre-denitrification tank (2) is provided with a filler for stirring wastewater and denitrification. Agitating and flushing device for flushing the suspended solids accumulated on the surface of the filler and the aged biofilm; The aerobic biochemical system comprises an aerobic pool (8), the aerobic pool (8) is communicated with the denitrification pool (2) through a denitrification pool interception filler flow device, and the aerobic pool (8) is filled with Aerobic packing and an aeration component for aeration in the aerobic tank (8) are provided; the nitrification system includes a nitrification tank (12), and the nitrification tank (12) intercepts the packing circulation device and the aerobic tank through the aerobic tank. The aerobic tank (8) is connected, and the nitrification tank (12) is filled with nitrification fillers. 2. The aquaculture tail water treatment device based on suspended filler biofilm technology according to claim 1, wherein the denitrification filler comprises a suspension filler filled in the pre-denitrification tank (2) and a Denitrifying bacteria on suspended packing. 3. The aquaculture tail water treatment device based on the suspended filler biofilm technology according to claim 2, characterized in that: the bottom of the front denitrification tank (2) is fixedly arranged with a bottom water distribution pipe (6), and the bottom is arranged with a bottom water distribution pipe (6). The water inlet end of the water pipe (6) is communicated with the water inlet valve (1) arranged at the water inlet of the front denitrification tank (2) through the pipe. 4. The aquaculture tail water treatment device based on suspended filler biofilm technology according to claim 3, characterized in that: the stirring and washing device comprises a hyperboloid agitator (5), and the hyperboloid agitator (5) The stirring blade at the lower end is placed in the front denitrification tank (2), and the front denitrification tank (2) is also provided with a forward flushing pipe (4), and the intake end of the forward flushing pipe (4) is connected to the The fan (18) arranged outside the front denitrification tank (2) is communicated. 5. The aquaculture tail water treatment device based on the suspended filler biofilm technology according to claim 4, characterized in that: the denitrification tank interception filler circulation device comprises a denitrification tank (2) that is disposed near the upper end of the denitrification tank (2). The nitrification tank outlet interception screen (3), the outlet end of the denitrification tank outlet interception screen (3) is connected with the aerobic tank inlet bottom water distribution pipe (9) through the guide pipe, and the aerobic tank inlet water bottom is distributed The water pipe (9) is arranged at the bottom of the aerobic pool (8). 6. The aquaculture tail water treatment device based on suspended filler biofilm technology according to claim 5, characterized in that: the aerobic filler comprises a suspended filler filled in the aerobic tank (8) and a suspended filler attached to the suspended filler aerobic microorganisms. 7. The aquaculture tail water treatment device based on suspended filler biofilm technology according to claim 6, wherein the reflux device comprises a reflux device arranged between the nitrification tank (12) and the denitrification tank (2). The pipeline (16), the return pipeline (16) is provided with a return pump (17) in series, and the water inlet end of the return pipeline (16) is connected with a nitrification tank outlet intercepting screen ( 11), the water outlet end of the return line (16) is connected to the water inlet of the bottom water distribution pipe (6) in the front denitrification tank (2).

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