CN102276103B - Integrated in-situ denitrification aquaculture wastewater biological treatment device and treatment method - Google Patents

Abstract

An integrated in-situ denitrification culture wastewater biological treatment device and treatment method relate to a sewage treatment device and treatment method. The invention aims to provide a treatment device and treatment method with low sludge yield, no refluxing process and good ammonia nitrogen treatment effect. The treatment device comprises a pool body, wherein the inside of the pool body is divided into an anaerobic carbon-removing area, an aerobic nitrification and precipitation area and an anoxic denitrification area through a plurality of partition plates; the aerobic nitrification and precipitation area comprises an aerobic aeration chamber, a precipitation chamber and the forth falling compartment; the anaerobic carbon-removing area is communicated with the upper part of the forth falling compartment, the bottom of the forth falling compartment is communicated with the bottom of the aerobic aeration chamber; the bottom of the aerobic aeration chamber is provided with an aeration device, the bottom of the aerobic aeration chamber is communicated with the bottom of the precipitation chamber; one side close to the precipitation chamber, of the middle part of the aerobic aeration chamber is provided with a stream-separating plate longitudinally; the stream-separating plate is used to form a stream-separating channel between the aerobic aeration chamber and the precipitation chamber; and the upper end of the stream-separating channel is communicated with the aerobic aeration chamber, and the lower end is communicated with the precipitation chamber.

Description

Integrated in-situ denitrification aquaculture wastewater biological treatment device and treatment method

technical field

The invention relates to a sewage treatment device and a treatment method, in particular to an integrated in-situ denitrification aquaculture wastewater biological treatment device and a treatment method.

Background technique

Although the development of my country's large-scale urban livestock and poultry breeding industry started late, its development momentum is very rapid, and it has reached a considerable scale in just over ten years, and continues to develop at a high speed. As the prevention and management of livestock and poultry pollution is far behind the rapid development of the industry, there is a lack of basic information and data on the pollution system of the livestock and poultry industry. While the rapid development of the aquaculture industry has brought huge economic benefits to the society, the environmental problems caused by the aquaculture wastewater discharged by it have become increasingly serious. The pollution of aquaculture wastewater is mainly ammonia nitrogen pollution, which has become the third largest pollution source after urban life and industrial wastewater. .

Due to the lack of attention paid to the pollution of livestock and poultry farming, coupled with the low profit of livestock and poultry farming, most farms directly discharge livestock and poultry wastewater without effective treatment. With the intensification of eutrophication in water bodies, people pay more and more attention to the discharge of nitrogen and phosphorus in wastewater. Eutrophication is one of the most important water pollution problems facing the world today. The livestock and poultry wastewater has the characteristics of high suspended solids, high organic matter concentration, and high ammonia nitrogen concentration. Although domestic and foreign scholars have conducted a lot of experimental research on the treatment of livestock and poultry wastewater, there are still many problems in the application of current technologies. For example, the natural treatment system is used for treatment, and its treatment effect is easily affected by seasons, temperature and land area. For the actual situation in my country where there are many people and little land, biological treatment technology will be the best for the treatment of aquaculture wastewater in land-limited areas. choose. However, the concentration of pollutants in the water after anaerobic treatment is still high, especially the ammonia nitrogen is basically not removed. After being discharged into the water body, it will induce "eutrophication" of the water body, causing the disorder of the aquatic ecosystem, and can also consume dissolved oxygen, resulting in The water body is hypoxic and needs to be further treated to remove nitrogen and phosphorus.

In recent years, although my country's sewage treatment rate has continued to increase, the eutrophication problem caused by nitrogen and phosphorus pollution has not only not been resolved, but has become increasingly serious. It can be seen that the main contradiction of sewage treatment has gradually changed from the removal of organic pollutants to the removal of nitrogen and phosphorus pollutants. This prompts people to transform the traditional activated sludge process to improve the removal rate of nitrogen and phosphorus. Nitrogen compounds (NH ₄ ⁺ -N and NO ₃ -N) have relatively small molecular weights and cannot be removed by adding chemicals. In addition, if physical and chemical methods are used, such as using membrane separation technology to remove nitrogen compounds, only reverse osmosis membrane technology is the most effective, but the engineering cost and operating cost are also very high. Therefore, the removal of nitrogen is the difficulty and focus of sewage treatment, and only the use of biological denitrification technology is the most reasonable and feasible. On the other hand, the phosphorus compounds in sewage are sometimes difficult to remove by biological treatment methods, but satisfactory phosphorus removal effects can be achieved by coagulation with drugs. Therefore, biological denitrification technology is the key to the advanced treatment of sewage.

At present, there are many technologies for denitrification, the most representative ones are SBR method, A/0 method, and oxidation ditch process. However, SBR method can only be applied to small sewage treatment plants, which has the advantages of long idle period of pool capacity and complicated operation management. And other shortcomings, there are few applications in urban sewage treatment plants. The oxidation ditch process is a delayed aeration process, which has the disadvantages of high infrastructure and operating costs. AA/0 biological nitrogen removal process is the abbreviation of anaerobic/anoxic/aerobic biological nitrogen and phosphorus removal process. It is the most widely used nitrogen removal process in urban sewage treatment plants in my country. Denitrification operates under anoxic conditions. The removal of carbon-containing organic matter and the nitrification of ammonia nitrogen operate under aerobic conditions. Compared with the traditional multi-stage biological denitrification process, it has many advantages, but it only converts ammonia nitrogen into nitrate nitrogen, and does not really realize the nitrogen pollution. removal. However, many studies only use the A/A/O space environment of aquaculture wastewater, consider the denitrification effect alone, and lack the research on the effect of carbon-nitrogen ratio on nitrification and denitrification. Excessive COD is not conducive to the growth of nitrification and denitrification bacteria. affect the denitrification effect. If it is to be removed, a large amount of reflux power is required, and the treatment conditions are changed from anaerobic to aerobic to anoxic through effluent reflux to achieve denitrification. Therefore, the sewage treatment load is high and the operating cost is too high. This is the current sewage treatment in my country. The shortcomings of high energy consumption, low efficiency and unstable operation of plant biological denitrification are common. If the backflow can be effectively reduced, the sludge yield can be reduced, and the carbon source and alkalinity in the denitrification tank can be increased, the smooth realization of AA/0 biological denitrification can be guaranteed.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated in-situ denitrification aquaculture wastewater biological treatment device and treatment method with low sludge yield, no need for reflux, and good ammonia nitrogen treatment effect.

The integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention comprises a pool body, and the pool body is divided into an anaerobic carbon removal area, an aerobic nitrification and precipitation area, and an anoxic denitrification area by several partitions, wherein the The anaerobic carbon removal zone is longitudinally provided with several upward flow baffles and downward flow baffles, and the upward flow baffles and downward flow baffles divide the anaerobic carbon removal zone into at least one group of descending Compartments and ascending compartments, the first descending compartment, the second descending compartment and the first ascending compartment, the second ascending compartment are arranged crosswise, the first descending compartment and the first ascending compartment in each group chamber, the second descending compartment and the second ascending compartment are communicated through the channel arranged under the downward flow baffle between them, and the first ascending compartment and the second descending compartment between adjacent groups are communicated through the passage disposed between them It communicates with the channel above the flow baffle, and the width of the first ascending compartment and the second ascending compartment is 3-5 times that of the first descending compartment and the second descending compartment. In the first group The upper part of the first descending compartment communicates with the main water inlet pipe, and the water inlet valve is installed on the main water inlet pipe;

The aerobic nitrification and precipitation zone includes an aerobic aeration chamber, a sedimentation chamber and a fourth descending compartment, the upper part of the second ascending compartment in the anaerobic carbon removal zone communicates with the upper part of the fourth descending compartment, The bottom of the fourth descending compartment communicates with the bottom of the aerobic aeration chamber, the bottom of the aerobic aeration chamber is provided with an aeration device, and the bottom of the aerobic aeration chamber communicates with the bottom of the sedimentation chamber, The middle part of the aerobic aeration chamber near the sedimentation chamber is longitudinally provided with a divider, and the divider separates a shunt channel between the aerobic aeration chamber and the sedimentation chamber. The upper end of the shunt passage is connected to the aerobic aeration The air chamber is connected, and the lower end is connected with the precipitation chamber;

The anoxic denitrification zone includes a third descending compartment and a third ascending compartment, the upper part of the third descending compartment communicates with the upper part of the precipitation chamber, and the bottom of the third descending compartment communicates with the third ascending compartment The bottom of the third ascending compartment is connected, the upper side wall of the third rising compartment is provided with an overflow weir, the overflow weir is provided with a water outlet pipe, and the upper part of the third descending compartment is connected with the water inlet pipe , the water inlet pipe communicates with the main water inlet pipe through a water diversion valve;

The top of the pool body is provided with a number of working ports, which correspond to the anaerobic carbon removal zone and the anoxic denitrification zone respectively, and a cover plate is provided on the working port, and the cover plate is provided with an exhaust hole. Fillers suitable for microbial attachment are arranged in the first ascending compartment, the second ascending compartment, the aerobic aeration zone and the third ascending compartment.

The integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention, wherein the pool body is a cylinder arranged vertically, the settling chamber is set in the center of the pool body, and the first group of the first drop in the anaerobic carbon removal zone The compartment is adjacent to the third descending compartment of the anoxic denitrification zone.

The integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention, wherein the inner wall of the sedimentation chamber is provided with several inclined plates inclined downward.

The integrated in-situ denitrification breeding wastewater biological treatment device of the present invention, wherein the upper end of the flow partition is provided with an upper deflector inclined to the aerobic aeration chamber, and the lower end of the flow partition is provided with a lower deflector inclined to the sedimentation chamber. deflector.

The integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention, wherein the filler is square particle modified polyurethane plastic foam.

The integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention, wherein two sets of ascending compartments and descending compartments are arranged in the anaerobic carbon removal area.

The biological treatment method of aquaculture wastewater of the present invention comprises the following steps:

[1] Connect the aquaculture wastewater that has been separated by the dry-clear feces separation and the liquid-liquid separation device into the main water inlet pipe of the above-mentioned treatment device, and the wastewater enters the anaerobic carbon removal area, and passes through the first descending compartment and the second descending compartment. The flow of the chamber and the first rising compartment and the second rising compartment enters the fourth descending compartment of the aerobic aeration and sedimentation zone;

【2】Wastewater enters the aerobic aeration chamber from the bottom of the fourth descending compartment for aerobic micro-aeration, wherein the upper limit of the oxygen supply intensity of the aerobic micro-aeration is that the liquid-phase dissolved oxygen level is lower than 2mgO ₂ /L;

【3】After aerobic aeration, the waste water enters the diversion channel, and enters the bottom of the sedimentation chamber from the lower end of the diversion channel. Adjust the position of the partition plate and change the width of the diversion channel so that the hydraulic flow rate in the diversion channel is 0.2-1.0m/ s;

【4】Wastewater flows upward from the bottom of the sedimentation chamber, and the sludge in the wastewater settles back to the bottom of the aerobic aeration chamber, where it is mixed and aerated with the wastewater again;

[5] The wastewater after precipitation enters the third descending compartment of the anoxic denitrification zone from the upper part of the sedimentation chamber, and the water diversion valve is opened to allow part of the aquaculture wastewater to directly enter the third descending compartment. After the wastewater is mixed, it flows from the third descending compartment The bottom of the chamber enters the third rising compartment and fully contacts with the microorganisms attached to the modified polyurethane plastic foam, then enters the overflow weir on the upper part of the third rising compartment, and then flows out from the outlet pipe.

The biological treatment method for aquaculture wastewater of the present invention, wherein the hydraulic retention time in the anaerobic decarbonization zone is 22h, the hydraulic retention time in the aerobic micro-aeration zone is 7.5h, the hydraulic retention time in the sedimentation chamber is 0.5h, and the hydraulic retention time in the anoxic denitrification zone The time is 6 hours, and the waste water flowing out from the outlet pipe after one cycle is reintroduced into the water inlet pipe, and two cycles are a complete reaction cycle.

The biological treatment method for aquaculture wastewater of the present invention, wherein the ratio of the water intake of the main water inlet pipe to the water inlet amount of the sub-water inlet pipes is 4-5:1.

In the biological treatment method for aquaculture wastewater of the present invention, the COD:NH ₄ ⁺ -N of the influent water in the anoxic denitrification zone is less than 4:1.

The integrated in-situ denitrification aquaculture wastewater biological treatment device and treatment method of the present invention converts the transformation of the sequence of anaerobic-aerobic-anoxic environment realized in time from the traditional denitrification process AA/O into anaerobic-anoxic environment realized in space. The transformation of the sequence of aerobic-anoxic environment, denitrification is realized by continuously appearing anaerobic, aerobic, and anoxic environments in the direction of water flow, and at the same time, the carbon required for denitrification is supplemented to the anoxic denitrification area by using separate water inlet pipes The sludge produced by aerobic flow back into the aerobic aeration chamber naturally, so as to achieve the effective interception of biomass, greatly reduce the sludge concentration, and save a lot of return flow power costs and sludge disposal costs , It has a good removal effect on carbon pollution and nitrogen pollution of sewage, and at the same time improves the treatment efficiency of the reactor.

The integrated in-situ denitrification aquaculture wastewater biological treatment device and treatment method of the present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of the present invention's integrated in-situ denitrification aquaculture wastewater biological treatment device;

Fig. 2 is a sectional view in the direction of I-I in Fig. 1;

Fig. 3 is a sectional view in the direction of II-II in Fig. 1;

Fig. 4 is a sectional view along III-III direction in Fig. 1 .

Detailed ways

As shown in Figure 1, the integrated in-situ denitrification aquaculture wastewater biological treatment device of the present invention comprises a pool body 23, the pool body 23 is a cylinder arranged vertically, and the pool body 23 is divided into anaerobic carbon removal zone, The aerobic nitrification and sedimentation area, the anoxic denitrification area, and the anaerobic carbon removal area are longitudinally equipped with a number of upward flow baffles 24 and downward flow baffles 25, and upward flow baffles 24 and downward flow baffles The flow plate 25 divides the anaerobic carbon removal zone into two groups of descending compartments and ascending compartments, the first descending compartment 1, the second descending compartment 3 intersect with the first ascending compartment 2, and the second ascending compartment 4 Cloth, the first descending compartment 1 in each group communicates with the first ascending compartment 2, the second descending compartment 3 and the second ascending compartment 4 through passages arranged below the downward flow baffle 25 therebetween, The first ascending compartment 2 between adjacent groups communicates with the second descending compartment 3 by being arranged on the channel above the flow baffle 24 therebetween, and the width of the first ascending compartment 2 and the second ascending compartment 4 It is 4 times that of the first descending compartment 1 and the second descending compartment 3. The first ascending compartment 2 and the second ascending compartment 4 are filled with square particle modified polyurethane plastic foam fillers 19 suitable for microbial attachment. The upward flow baffles 24 and the downward flow baffles 25 prolong the water flow path, change the water flow velocity, and enhance the sufficient contact between the sewage and the microorganisms attached to the square particle modified polyurethane plastic foam filler 19 . The upper part of the first descending compartment 1 in the first group communicates with the main water inlet pipe 12, and the main water inlet pipe 12 is equipped with a water inlet valve 21.

Shown in conjunction with Fig. 2 and Fig. 3, aerobic nitrification and sedimentation area comprise aerobic aeration chamber 6, sedimentation chamber 7 and the 4th descending compartment 5, the upper part of the 2nd ascending compartment 4 in the anaerobic carbon removal area and the 4th compartment The tops of the four descending compartments 5 are connected, and the bottom of the fourth descending compartment 5 is communicated with the bottom of the aerobic aeration chamber 6, and the bottom of the aerobic aeration chamber 6 is equipped with an aeration device 20, and the aerobic aeration chamber The bottom of 6 communicates with the bottom of sedimentation chamber 7, which is arranged in the center of pool body 23, and several inclined plates 22 inclined downwards are installed on the inner wall of sedimentation chamber 7. The middle part of the aerobic aeration chamber 6 near the side of the sedimentation chamber 7 is longitudinally provided with a divider 16, and the divider 16 separates a split channel 10 between the aerobic aeration chamber 6 and the sedimentation chamber 7, and the upper end of the split channel 10 It communicates with the aerobic aeration chamber 6, and its lower end communicates with the sedimentation chamber 7. The upper end of the flow partition 16 is equipped with an upper deflector 27 inclined to the aerobic aeration chamber 6, and the lower end of the flow partition 16 is installed with a direction The lower deflector 28 of the sedimentation chamber 7 is inclined. The aerobic aeration chamber 6 is filled with square particle modified polyurethane plastic foam filler 19 suitable for microbial attachment.

As shown in Figure 4, the anoxic denitrification zone includes the third descending compartment 8 and the third ascending compartment 9, the first group of the first descending compartment 1 of the anaerobic carbon removal zone and the third compartment 1 of the anoxic denitrification zone. The descending compartment 8 is adjacent, the upper part of the third descending compartment 8 communicates with the upper part of the settling chamber 7, the bottom of the third descending compartment 8 communicates with the bottom of the third ascending compartment 9, and the third ascending compartment 9 It is filled with square particle modified polyurethane plastic foam filler 19 suitable for microorganism attachment. The side wall of the top of the third rising compartment 9 is provided with an overflow weir 15, and an outlet pipe 11 is arranged in the overflow weir 15, and the top of the third descending compartment 8 is connected with the water inlet pipe 12 ', and the water inlet pipe 12' communicates with the main water inlet pipe 12 through the water diversion valve 21'.

A number of working ports 26 are installed on the top of the pool body 23. The working ports 26 correspond to the anaerobic carbon removal zone and the anoxic denitrification zone respectively.

The biological treatment method of aquaculture wastewater of the present invention comprises the following steps:

[1] Connect the aquaculture wastewater after dry-clear feces separation and liquid-liquid separation device to the main water inlet pipe 12 of the above-mentioned treatment device, the wastewater quality is 6000 mg/L for COD, and 500 mg/L for NH ₄ ⁺ -N, TN is 18mg/L, open the water inlet valve 21, so that 80% of the waste water enters the anaerobic carbon removal zone, and passes through the first descending compartment 1, the second descending compartment 3 and the first ascending compartment 2, the second ascending compartment The flow from compartment 4 enters the fourth descending compartment 5 of the aerobic aeration and sedimentation zone;

[2] Wastewater enters the aerobic aeration chamber 6 from the bottom of the fourth descending compartment 5 for aerobic micro-aeration, wherein the upper limit of the oxygen supply intensity of the aerobic micro-aeration is that the liquid-phase dissolved oxygen level is lower than 2mgO ₂ /L ;

[3] The waste water after aerobic aeration enters the diversion channel 10, enters the bottom of the sedimentation chamber 7 from the lower end of the diversion channel 10, adjusts the position of the divider 16, changes the width of the diversion channel 10, and reduces the hydraulic flow rate in the diversion channel 10 0.2-1.0m/s;

[4] The waste water flows upward from the bottom of the sedimentation chamber 7, and the sludge in the waste water settles and automatically flows back to the bottom of the aerobic aeration chamber 6, where it is mixed and aerated again with the waste water to achieve the purpose of sludge reduction;

【5】Wastewater after precipitation enters the third descending compartment 8 of the anoxic denitrification zone from the upper part of the sedimentation chamber 7, and opens the diversion valve 21', so that 20% of the culture waste water directly enters the third descending compartment 8. The influent COD:NH ₄ ⁺ -N of the third downcompartment 8 is less than 4:1, which supplements the carbon source required for denitrification. After mixing, the waste water enters the third ascending compartment 9 from the bottom of the third descending compartment 8 and fully contacts with the microorganisms attached to the modified polyurethane plastic foam, then enters the overflow weir 15 on the top of the third ascending compartment 9, and then flows from the exit Water pipe 11 flows out. The hydraulic retention time in the anaerobic carbon removal area is designed to be 22 hours, the hydraulic retention time in the aerobic micro-aeration area is 7.5 hours, the hydraulic retention time in the sedimentation chamber is 0.5 h, and the hydraulic retention time in the anoxic denitrification area is 6 hours. The waste water flowing out of the water pipe 11 is reintroduced into the main water inlet pipe 12, and the two cycles constitute a complete reaction cycle.

After one reaction cycle, the COD of wastewater is 270mg/L, and the NH ₄ ⁺ -N is 180mg/L. The treatment effect is significantly improved, and the operating cost is also effectively reduced.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. An integrated in-situ denitrification aquaculture wastewater biological treatment device, including a pool body (23), the pool body (23) is divided into anaerobic carbon removal area, aerobic nitrification and sedimentation area and The anoxic denitrification zone is characterized in that: the anaerobic carbon removal zone is longitudinally provided with several upward flow baffles (24) and downward flow baffles (25), and the upward flow baffles ( 24) and downward flow baffles (25) divide the anaerobic carbon removal zone into at least one set of descending compartments and ascending compartments, the first descending compartment (1), the second descending compartment (3) and the first descending compartment The first ascending compartment (2) and the second ascending compartment (4) are arranged crosswise, and the first descending compartment (1) in each group is connected with the first ascending compartment (2) and the second descending compartment (3) It communicates with the second ascending compartment (4) through the channel arranged under the downward flow baffle (25) between them, and the first ascending compartment (2) and the second descending compartment (3) between adjacent groups The width of the first ascending compartment (2) and the second ascending compartment (4) is equal to that of the first descending compartment (1). ), 3-5 times of the second descending compartment (3), the upper part of the first descending compartment (1) in the first group communicates with the main water inlet pipe (12), and the main water inlet pipe (12) is equipped with There is a water inlet valve (21); The aerobic nitrification and precipitation zone includes an aerobic aeration chamber (6), a precipitation chamber (7) and a fourth descending compartment (5), and the second ascending compartment (4) in the anaerobic carbon removal zone The upper part communicates with the upper part of the fourth descending compartment (5), the bottom of the fourth descending compartment (5) communicates with the bottom of the aerobic aeration chamber (6), and the aerobic aeration chamber (6) ) is provided with an aeration device (20) at the bottom, the bottom of the aerobic aeration chamber (6) communicates with the bottom of the sedimentation chamber (7), and the middle part of the aerobic aeration chamber (6) is close to the sedimentation chamber (7). A divider (16) is arranged longitudinally on the side, and the divider (16) separates a diversion channel (10) between the aerobic aeration chamber (6) and the sedimentation chamber (7), and the diversion channel (10 ) is communicated with the aerobic aeration chamber (6) at the upper end, and communicated with the sedimentation chamber (7) at the lower end; The anoxic denitrification zone includes a third descending compartment (8) and a third ascending compartment (9), the upper part of the third descending compartment (8) communicates with the upper part of the precipitation chamber (7), and the third The bottom of the third descending compartment (8) communicates with the bottom of the third ascending compartment (9), and the upper side wall of the third ascending compartment (9) is provided with an overflow weir (15), the The overflow weir (15) is provided with an outlet pipe (11), and the upper part of the third descending compartment (8) communicates with the sub-inlet pipe (12'), and the sub-inlet pipe (12') passes through the The valve (21') communicates with the main water inlet pipe (12); The top of the pool body (23) is provided with a number of working ports (26), the working ports (26) correspond to the anaerobic carbon removal zone and the anoxic denitrification zone respectively, and the working ports (26) are provided with cover plates (14), the cover plate (14) is provided with an exhaust hole (13), the first ascending compartment (2), the second ascending compartment (4), the aerobic aeration chamber (6) and the Fillers (19) suitable for microorganism attachment are arranged in the three ascending compartments (9). 2. The integrated in-situ denitrification aquaculture wastewater biological treatment device according to claim 1, characterized in that: the pool body (23) is a cylinder arranged vertically, and the settling chamber (7) is set in the pool body (23) In the center, the first set of first descending compartments (1) of the anaerobic carbon removal zone is adjacent to the third descending compartment (8) of the anoxic denitrification zone. 3. The integrated in-situ denitrification aquaculture wastewater biological treatment device according to claim 2, characterized in that: the inner wall of the settling chamber (7) is provided with several downward sloping plates (22). 4. The integrated in-situ denitrification aquaculture wastewater biological treatment device according to claim 3, characterized in that: the upper end of the partition plate (16) is provided with an upper guide inclined to the aerobic aeration chamber (6) The flow plate (27), the lower end of the flow divider (16) is provided with a lower deflector (28) inclined to the sedimentation chamber (7). 5. The integrated in-situ denitrification aquaculture wastewater biological treatment device according to claim 4, characterized in that: the filler (19) is a square particle modified polyurethane plastic foam. 6. The integrated in-situ denitrification aquaculture wastewater biological treatment device according to claim 5, characterized in that: the anaerobic carbon removal zone is provided with two sets of ascending compartments and descending compartments. 7. A biological treatment method for aquaculture wastewater, comprising the steps of: [1] Connect the aquaculture wastewater that has been separated by dry feces separation and liquid-liquid separation device into the main water inlet pipe (12) of the treatment device according to claim 1, and the wastewater enters the anaerobic carbon removal zone, and passes through the first The flow of the descending compartment (1), the second descending compartment (3) and the first ascending compartment (2), the second ascending compartment (4) enters the fourth descending compartment ( 5); 【2】Wastewater enters the aerobic aeration chamber (6) from the bottom of the fourth descending compartment (5) for aerobic micro-aeration, wherein the upper limit of the oxygen supply intensity of the aerobic micro-aeration is that the level of dissolved oxygen in the liquid phase is lower than 2mgO ₂ /L; [3] The waste water after aerobic aeration enters the diversion channel (10), enters the bottom of the sedimentation chamber (7) from the lower end of the diversion channel (10), adjusts the position of the divider (16), and changes the position of the diversion channel (10). The width is such that the hydraulic drop velocity in the diversion channel (10) is 0.2-1.0m/s; 【4】Wastewater flows upward from the bottom of the sedimentation chamber (7), and the sludge in the waste water settles back to the bottom of the aerobic aeration chamber (6), where it is mixed and aerated again with the wastewater; [5] The sedimented wastewater enters the third descending compartment (8) of the anoxic denitrification zone from the upper part of the sedimentation chamber (7), and opens the diversion valve (21'), so that part of the aquaculture wastewater directly enters the third descending compartment Compartment (8), after the wastewater is mixed, it enters the third ascending compartment (9) from the bottom of the third descending compartment (8) and fully contacts with the microorganisms attached to the modified polyurethane plastic foam, and then enters the third ascending compartment (9) In the overflow weir (15) on the top, it flows out from the outlet pipe (11). 8. The cultivation wastewater biological treatment method according to claim 7, characterized in that: the hydraulic retention time of the anaerobic carbon removal zone is 22h, the hydraulic retention time of aerobic micro-aeration is 7.5h, and the hydraulic retention time of the sedimentation chamber is 0.5h, the hydraulic retention time in the anoxic denitrification zone is 6h, and the wastewater flowing out of the outlet pipe (11) after one cycle is reintroduced into the main water inlet pipe (12), and two cycles constitute a complete reaction cycle. 9. The biological treatment method for aquaculture wastewater according to claim 7 or 8, characterized in that the ratio of the water intake of the main water inlet pipe (12) to the water inlet amount of the sub-water inlet pipes (12') is 4-5:1. 10 . The biological treatment method for aquaculture wastewater according to claim 9 , characterized in that: COD:NH ₄ ⁺ -N of influent water in the anoxic denitrification zone is less than 4:1. 11 .

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