Integrated anaerobic ammonia oxidation denitrification device for aquaculture and process thereof

Abstract

The application discloses an integrated anaerobic ammonia oxidation denitrification device for aquaculture and a process thereof, and relates to the technical field of sewage treatment. The device comprises a tank body, an exhaust port is formed in the top of the tank body, a sewage outlet is formed in the bottom of the tank body, a water outlet and a water inlet are respectively formed in the side wall of the tank body, the inside of the tank body is divided into a clear water area, a PD / A reaction area, an anaerobic reaction area, a vertical flow sedimentation area and a sludge collection area from top to bottom, and water quality detection ports are formed in the side walls of the tank body located in the anaerobic reaction area and the PD / A reaction area. Aquaculture tail water enters the tank body from the vertical flow sedimentation area, passes through the anaerobic reaction area and the PD / A reaction area, clear water enters the clear water area and is discharged, and sludge enters the sludge collection area and is discharged. The device overcomes the defects of the traditional nitrification and denitrification denitrification reaction process which is not suitable for water quality treatment of aquaculture with large flow and low nitrogen pollution load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an integrated anaerobic ammonia oxidation denitrification device for aquaculture and a process thereof. BACKGROUND

[0002] The tail water of aquaculture has the characteristics of high COD, high DO concentration and coexistence of three-state nitrogen, and low carbon-nitrogen ratio (C / N), low ammonia nitrogen and low nitrite concentration, which results in low denitrification efficiency of the traditional nitrification and denitrification denitrification reaction process; and the traditional nitrification and denitrification denitrification process has large land occupation, large aeration quantity, high carbon source consumption, high energy consumption and cost, and is not suitable for water quality treatment of large flow and low nitrogen pollution load. At present, the research in the field of water treatment for aquaculture is mainly limited to converting ammonia nitrogen and nitrite, which directly damages fish, into nitrate nitrogen, which has no obvious harm to aquatic animals, and does not fundamentally remove the nitrogen pollution load from the aquaculture system. The continuous accumulation of nitrate nitrogen in the system will cause environmental stress to aquatic animals and affect their growth when reaching a certain threshold, and will directly endanger aquatic animals under certain conditions by being reversely converted into nitrite nitrogen and ammonia nitrogen. There is an urgent need for a new denitrification device suitable for water treatment in aquaculture, which is low in consumption and high in efficiency.

[0003] Therefore, an anaerobic ammonia oxidation water treatment device is needed. SUMMARY

[0004] In view of the above shortcomings, the present application provides an integrated anaerobic ammonia oxidation denitrification device for aquaculture and a process thereof, which can overcome the defects of the traditional nitrification and denitrification denitrification reaction process that is not suitable for water quality treatment of large flow and low nitrogen pollution load. The specific technical solutions are as follows:

[0005] An anaerobic ammonia oxidation water treatment device, comprising a tank body, an exhaust port is formed at the top of the tank body, a sewage discharge port is formed at the bottom of the tank body, a water outlet and a water inlet are respectively formed in the side wall of the tank body, the inside of the tank body is divided into a clear water zone, a PD / A reaction zone, an anaerobic reaction zone, a vertical flow sedimentation zone and a sewage collection zone from top to bottom, and a water quality detection port is formed in the side wall of the tank body at the anaerobic reaction zone and the PD / A reaction zone;

[0006] The vertical flow sedimentation zone comprises a vertical flow sedimentation device, a third bracket net, a water inlet reflector and a water distribution pipe. The third bracket net is installed on the inner side wall of the tank body and is perpendicular to the tank body axis. The third bracket net is located between the anaerobic reaction zone and the sludge collection zone. The vertical flow sedimentation device is installed on the third bracket net. The vertical flow sedimentation device comprises an outer shell and an inner shell. The water inlet reflector is installed on the top of the inner shell. The projection area of the water inlet reflector in the direction of the tank body axis is half of the projection area of the outer shell in the direction of the tank body axis. One end of the water distribution pipe is connected with the water inlet. The other end of the water distribution pipe penetrates the anaerobic reaction zone and is located in the inner shell with the port upward.

[0007] Preferably, the clear water zone comprises a first bracket net and filter cotton. The first bracket net is installed on the inner side wall of the tank body and is perpendicular to the tank body axis. The filter cotton is installed on the first bracket net and is used for filtering the tail water treated by the PD / A reaction zone. The water outlet is located above the filter cotton.

[0008] Preferably, the PD / A reaction zone comprises a second bracket net, an inner cylinder support, an inner cylinder, a flow guide net, an inner cylinder flow guide plate and a gas distribution pipe. The second bracket net is installed on the inner side wall of the tank body and is perpendicular to the tank body axis. One end of the flow guide net is installed on the second bracket net. The inner cylinder support is installed on the inner side wall of the tank body and is perpendicular to the tank body axis. The inner cylinder support is located between the second bracket net and the clear water zone. The gas distribution pipe is installed on the second bracket net and is away from the side of the flow guide net. The inner cylinder is installed on the inner cylinder support. The inner cylinder flow guide plate is installed on the end of the inner cylinder close to the flow guide net. The inner cylinder and the flow guide net are coaxial with the tank body.

[0009] Preferably, the flow guide net is trumpet-shaped and the opening faces upward. The end of the flow guide net away from the second bracket net is connected with the inner side wall of the tank body. The inner cylinder flow guide plate is trumpet-shaped and the opening faces downward. The end of the flow guide net close to the second bracket net is not provided with a filter hole.

[0010] Preferably, the gas distribution pipe is spirally arranged on the second bracket net for 2-3 turns. The gas introduced by the gas distribution pipe is air.

[0011] Preferably, the anaerobic reaction zone comprises a gas-water backwashing pipe, biochemical balls and ceramic particles. The outer shell and the inner side wall of the tank body are filled with the biochemical balls and the ceramic particles. The gas-water backwashing pipe is installed on the third bracket net. The water distribution pipe is composed of a horizontal part and a vertical part. The end of the horizontal part is connected with the water inlet. The vertical part and the vertical flow sedimentation device are coaxial with the tank body.

[0012] Preferably, the sludge collection zone comprises a conical hopper. One end of the conical hopper is connected with the sludge discharge port. The other end of the conical hopper is connected with the third bracket net.

[0013] Preferably, the PD / A reaction zone is filled with 25%-35% biological filler.

[0014] An integrated anaerobic ammonia oxidation denitrification process for aquaculture, comprising the above-mentioned integrated anaerobic ammonia oxidation denitrification device for aquaculture, and the production process steps are as follows:

[0015] S1: The tail water is collected from the aquaculture tail water collection tank, the tail water enters the tank body (1) through the water distribution pipe (17), and the water contains COD, , DO, and , after the action of the vertical flow sedimentation zone, rapid sedimentation and degradation occur in the vertical flow sedimentation zone, the DO concentration is reduced, the sludge enters the sludge collection zone, and the tail water is divided into two streams after passing through the vertical flow sedimentation zone.

[0016] S2: After passing through the vertical flow sedimentation zone, 50% of the tail water and will enter the anaerobic reaction zone, and the accumulated and will be degraded in the anaerobic reaction zone, and DO will inhibit the generation of , so that accumulates, and part of the precipitated sludge will enter the sludge collection zone.

[0017] S3: The , and from the anaerobic reaction zone will enter the PD / A reaction zone, and the and in the remaining 50% of the tail water in the vertical flow sedimentation zone will also enter the PD / A reaction zone, and under the condition of anaerobic ammonia oxidation bacteria and low oxygen, the generated is used as an inorganic carbon source, and the remaining , and will be oxidized to , so as to form denitrification of the tail water.

[0018] S4: The denitrified tail water enters the clear water zone through the filter cotton, and finally is discharged from the water outlet, then will be discharged from the exhaust port.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] 1. The denitrification equipment of the present application requires less aeration amount, and the theoretical oxygen demand is only 50% of that of the traditional process; in aquaculture, the high DO concentration of the system is completely provided by the breeding link, and only intermittent and small amount of aeration is required for MBBR filler stirring and bottom backwashing.

[0021] 2. The denitrification device of the present application consumes less organic matter than the prior art, and short-cut denitrification only consumes 20% of the carbon source, saving 80% of the carbon source; and since the tail water comes from the aquaculture tail water collection tank (pollution collection tank), the aquaculture tail water does not lack COD.

[0022] 3. The denitrification device of the present application saves the land occupation area of the water treatment facility, and does not need to additionally set up primary sedimentation tanks, secondary sedimentation tanks, nitrification tanks and other facilities, thereby reducing the land occupation area and equipment investment.

[0023] 4. The denitrification device of the present application has lower energy consumption than the existing device, and only the pressurized water inlet pump needs energy consumption, thereby reducing the operating cost.

[0024] 5. The denitrification device of the present application is a partial denitrification-based anaerobic ammonia oxidation denitrification process (PD / A), which is beneficial to the enrichment of functional microorganisms in the reactor and the improvement of the substrate exposure level, overcomes the defects of the traditional full nitrification-denitrification denitrification process that is not suitable for large flow, low nitrogen load and low C / N aquaculture tail water treatment, and improves the denitrification efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, various elements or parts are not necessarily drawn according to the actual proportions.

[0026] Figure 1 Fig. 1 is a structural schematic diagram of the device of the present application;

[0027] Figure 2 Fig. 2 is a process flow diagram of the present application.

[0028] 1, tank body; 2, exhaust port; 3, blowdown port; 4, water outlet; 5, water inlet; 6, first bracket net; 7, second bracket net; 8, inner cylinder support; 9, third bracket net; 10, filter cotton; 11, inner cylinder; 12, flow guide net; 13, inner cylinder flow guide plate; 14, air distribution pipe; 15, gas-water backwashing pipe; 16, vertical flow sedimentator; 1601, outer shell; 1602, inner shell; 17, water distribution pipe; 18, conical hopper; 19, water quality detection port; 20, water inlet reflection cover; 21, biological filler. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Next, the working principle of this embodiment is described in detail to make the skilled in the art better understand the present application:

[0031] Reference Figure 1 An anaerobic ammonia oxidation water treatment device, comprising a tank body 1, the tank body 1 is provided with an exhaust port 2 at the top, the tank body 1 is provided with a sewage outlet 3 at the bottom, the sidewall of the tank body 1 is respectively provided with a water outlet 4 and a water inlet 5, the inside of the tank body 1 is divided into a clear water area, a PD / A reaction area, an anaerobic reaction area, a vertical flow sedimentation area and a sewage collection area from top to bottom. The sidewall of the tank body 1 is provided with a water quality detection port 19 in the anaerobic reaction area and the PD / A reaction area. The water quality detection port 19 of the anaerobic reaction area is located at the top of the anaerobic reaction area, which is used to detect the substrate concentration of the effluent of the anaerobic area, as well as to detect the accumulation of ammonia nitrogen, sulfide and other substrates and the decrease of dissolved oxygen. The water quality detection port 19 of the PD / A reaction area is used to detect the removal of ammonia nitrogen and sulfide in the water sample of the PD / A reaction area, as well as the control of dissolved oxygen and temperature conditions.

[0032] The clear water area comprises a first bracket net 6 and filter cotton 10, the first bracket net 6 is installed on the inner sidewall of the tank body 1 and is perpendicular to the axis of the tank body 1, the filter cotton 10 is installed on the first bracket net 6, which is used to filter the tail water treated by the PD / A reaction area, and the water outlet 4 is located above the filter cotton 10. The tail water filtered by the filter cotton 10 has reached the effect of denitrification, so it is discharged from the water outlet 4, while the ammonia nitrogen and sulfide generated in the PD / A reaction area will be discharged from the exhaust port 2.

[0033] The PD / A reaction area comprises a second bracket net 7, an inner cylinder support 8, an inner cylinder 11, a flow guide net 12, an inner cylinder flow guide plate 13 and a gas distribution pipe 14, the second bracket net 7 is installed on the inner sidewall of the tank body 1 and is perpendicular to the axis of the tank body 1, one end of the flow guide net 12 is installed on the second bracket net 7, the flow guide net 12 is used to guide the tail water floating from the vertical flow sedimentation area to enter the inner cylinder 11, after leaving the inner cylinder 11 away from the one end of the flow guide net 12, part of it flows downward to the flow guide net 12 to form a circulating flow, which ensures that the tail water is fully reacted in the PD / A reaction area. The inner cylinder support 8 is installed on the inner sidewall of the tank body 1 and is perpendicular to the axis of the tank body 1, and the inner cylinder support 8 is located between the second bracket net 7 and the clear water area. The gas distribution pipe 14 is installed on the side of the second bracket net 8 away from the flow guide net 12, and the gas distribution pipe is spirally arranged with 2-3 turns on the second bracket net to increase the uniformity of gas distribution. The gas introduced by the gas distribution pipe 14 is air, which is used to roll the biological filler 21. The degradation of COD in the anaerobic reaction area will produce a large amount of CO2 which rises into the PD / A reaction area, and under the action of the anaerobic ammonia oxidation bacteria in the PD / A reaction area , react with The nitrogen element in the tail water is separated out. The inner cylinder 11 is installed on the inner cylinder support 8, and the inner cylinder guide plate 13 is installed on one end of the inner cylinder 11 close to the guide net 12. The inner cylinder 11 and the guide net 12 are coaxial with the tank body 1, and the inner cylinder guide plate 13 is used to guide most of the water flow that is partially floated from the vertical flow sedimentation area to enter the inner cylinder 11, thereby ensuring the stability of the circulating water flow.

[0034] The guide net 12 is trumpet-shaped and opens upward, and the end of the guide net 12 away from the second bracket net 7 is connected to the inner side wall of the tank body 1. The inner cylinder guide plate 13 is trumpet-shaped and opens downward, and is used to guide the biological filler 21 sinking with the downflow to gather above the second bracket net 7, and to rise into the inner cylinder 11 under the push of the air in the air distribution pipe 14, thereby ensuring that the biological filler 21 is uniformly circulated and turned over, and fully contacts the water body substrate and reacts. The end of the guide net 12 close to the second bracket net 7 is not provided with a filter hole.

[0035] The PD / A reaction area is filled with 30% volume, such as K3 / K5 / SDC, for trapping and adsorbing active sludge, domesticating and enriching anaerobic ammonia oxidation bacteria, and the biological filler 21 maintaining a volume density of 25%-35% is more conducive to the growth of anaerobic ammonia oxidation bacteria. The anaerobic ammonia oxidation bacteria utilize or to carry out cell synthesis.

[0036] The anaerobic reaction area includes the air-water backwashing pipe 15, biochemical balls and ceramic particles. The shell 1601 is filled with biochemical balls and ceramic particles between the inner side wall of the tank body 1. The air-water backwashing pipe 15 is installed on the third bracket net 9 and is used for backwashing to prevent the anaerobic layer filler from being blocked after long-term use. The anaerobic reaction area is used for degrading suspended matter and soluble COD in water, and respectively produces accumulated by the ammonification of organic matter by ammonification bacteria and the short-range denitrification of nitrate nitrogen (NO3-) by low dissolved oxygen (DO), thereby continuously providing sufficient concentration of reaction substrates for the denitrification reaction of the PD / A reaction area and improving the denitrification effect.

[0037] The vertical flow sedimentation zone comprises a vertical flow sedimentation device 16, a third truss net 9, a water inlet reflection cover 20 and a water distribution pipe 17. The third truss net 9 is installed on the inner side wall of the tank body 1 and is perpendicular to the axis of the tank body 1. The third truss net 9 is located between the anaerobic reaction zone and the sludge collection zone. The vertical flow sedimentation device 16 is installed on the third truss net 9. The vertical flow sedimentation device 16 comprises an outer shell 1601 and an inner shell 1602. The water inlet reflection cover 20 is installed on the top of the inner shell 1602 and is used for reflecting, limiting and guiding the water inlet to the bottom sludge collection zone of the PD / A reaction zone. The projection area of the water inlet reflection cover 20 in the direction of the axis of the tank body 1 is half of the projection area of the outer shell 1601 in the direction of the axis of the tank body 1. 50% of the water inlet passes through the anaerobic zone to enter the PD / A reaction zone. The other 50% of the water inlet rises from between the outer shell 1601 and the inner shell 1602 after sedimentation to enter the PD / A reaction zone. One end of the water distribution pipe 17 is connected with the water inlet 5. The other end of the water distribution pipe passes through the anaerobic reaction zone and is located in the inner shell with the port upward. The vertical flow sedimentation device 16 is used for allowing the sludge in the tail water to sediment into the sludge collection zone for collection and discharge. The tail water connected with the water inlet 5 comes from the aquaculture tail water collection tank. The COD of the aquaculture tail water is not lacking. Compared with the prior art, the short-cut denitrification only needs to consume 20% of the carbon source, thereby saving 80% of the carbon source.

[0038] The water distribution pipe 17 comprises a horizontal part and a vertical part. The end of the horizontal part is connected with the water inlet 5. The vertical part is coaxial with the tank body 1. The water distribution can allow the tail water to fully act on the vertical flow sedimentation device 16, so that the sludge can be better separated and precipitated.

[0039] The sludge collection zone comprises a conical hopper 18. One end of the conical hopper 18 is connected with the sludge discharge port 3. The other end of the conical hopper 18 is connected with the third truss net 9.

[0040] Reference Figure 2 The process flow of the device is as follows:

[0041] S1: The water in the aquaculture tail water collection tank (sludge collection tank) enters the tank body 1 through the water distribution pipe 17. The water contains COD, , DO, and . After the action of the vertical flow sedimentation zone, rapid precipitation and degradation occur in the vertical flow sedimentation zone. The DO concentration is reduced. The sludge enters the sludge collection zone.

[0042] S2: After passing through the vertical flow sedimentation zone, 50% of and enter the anaerobic reaction zone. In the anaerobic reaction zone, the accumulated and are degraded. The DO inhibits the generation of , thereby accumulating . Part of the precipitated sludge enters the sludge collection zone.

[0043] S3: the anaerobic reaction zone 、 and will enter the PD / A reaction zone, the remaining 50% of the vertical flow sedimentation zone and will also enter the PD / A reaction zone, under anaerobic ammonia oxidation bacteria and low oxygen conditions, the remaining , and will be oxidized to , thereby forming denitrification of tail water;

[0044] S4: the tail water after denitrification enters the clear water zone through the filter cotton, and finally is discharged from the water outlet, then will be discharged from the exhaust port.

[0045] The device of the present application starts, and the pre-treatment steps before running:

[0046] (1) Anaerobic ammonia oxidation bacteria pre-culture, using biofilm sludge rich in anaerobic ammonia oxidation bacteria as inoculum, for rapid start-up of the device;

[0047] (2) With MBBR hydrophilic biological filler 21 to intercept and adsorb activated sludge, domesticated and enriched anaerobic ammonia oxidation bacteria, filling rate 30%;

[0048] (3) Intermittent aeration, strictly control DO (≤1 mg / L);

[0049] (4) Control the temperature (25~35℃, basically consistent with the water production and breeding 20~30℃);

[0050] (5) Control the pH value (7~8.5, completely consistent with the requirements of water production and breeding).

[0051] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An integrated anaerobic ammonia oxidation denitrification device for aquaculture, characterized in that, The tank (1) includes a vent (2) at the top and a drain (3) at the bottom. The side walls of the tank (1) are provided with an outlet (4) and an inlet (5). The interior of the tank (1) is divided into a clear water zone, a PD / A reaction zone, an anaerobic reaction zone, a vertical flow sedimentation zone, and a sludge collection zone from top to bottom. Water quality testing ports (19) are provided on the side walls of the anaerobic reaction zone and the PD / A reaction zone of the tank (1). The vertical flow sedimentation zone includes a vertical flow sedimentator (16), a third bracket net (9), an inlet reflector (20), and a water distribution pipe (17). The third bracket net (9) is installed on the inner wall of the tank (1) and is perpendicular to the axis of the tank (1). The third bracket net (9) is located between the anaerobic reaction zone and the sludge collection zone. The vertical flow sedimentator (16) is installed on the third bracket net (9). The vertical flow sedimentator (16) includes an outer shell (1601) and an inner shell (1602). The inlet reflector (20) is installed on the top of the inner shell (1602). The projected area of ​​the inlet reflector (20) about the axis of the tank (1) is half the projected area of ​​the outer shell (1601) about the axis of the tank (1). One end of the water distribution pipe (17) is connected to the inlet (5). The other end of the water distribution pipe (17) passes through the anaerobic reaction zone and is located inside the inner shell (1602) with its port facing upward.

2. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 1, characterized in that, The clear water zone includes a first bracket net (6) and a filter cotton (10). The first bracket net (6) is installed on the inner side wall of the tank (1) and is perpendicular to the axis of the tank (1). The filter cotton (10) is installed on the first bracket net (6) and is used to filter the tailwater after the PD / A reaction zone is treated. The outlet (4) is located above the filter cotton (10).

3. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 1, characterized in that, The PD / A reaction zone includes a second bracket net (7), an inner cylinder support (8), an inner cylinder (11), a flow guide net (12), an inner cylinder flow guide plate (13), and a gas distribution pipe (14). The second bracket net (7) is installed on the inner wall of the tank (1) and is perpendicular to the axis of the tank (1). One end of the flow guide net (12) is installed on the second bracket net (7). The inner cylinder support (8) is installed on the inner wall of the tank (1) and is perpendicular to the axis of the tank (1). The inner cylinder support (8) is located between the second bracket net (7) and the clear water zone. The gas distribution pipe (14) is installed on the second bracket net (7) on the side away from the flow guide net (12). The inner cylinder (11) is installed on the inner cylinder support (8). The inner cylinder flow guide plate (13) is installed on the end of the inner cylinder (11) near the flow guide net (12). The inner cylinder (11) and the flow guide net (12) are coaxial with the tank (1).

4. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 3, characterized in that, The guide net (12) is trumpet-shaped with its opening facing upward. The end of the guide net (12) away from the second bracket net (7) is connected to the inner wall of the tank body (1). The inner cylinder guide plate (13) is trumpet-shaped with its opening facing downward. The end of the guide net (12) near the second bracket net (7) does not have filter holes.

5. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 3, characterized in that, The air distribution pipe (14) is spirally arranged on the second bracket net (7) for 2-3 turns, and the gas introduced by the air distribution pipe (14) is air.

6. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 1, characterized in that, The anaerobic reaction zone includes an air-water backwash pipe (15), bio-balls and ceramsite. The space between the outer shell (1601) and the inner wall of the tank (1) is filled with bio-balls and ceramsite. The air-water backwash pipe (15) is installed on the third bracket net (9). The water distribution pipe (17) consists of a horizontal part and a vertical part. The end of the horizontal part is connected to the water inlet (5). The vertical part and the vertical flow sedimentation device (16) are coaxial with the tank (1).

7. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 1, characterized in that, The sewage collection area includes a conical bucket (18), one end of the cone top of the conical bucket (18) is connected to the sewage outlet (3), and the other end of the conical bucket (18) is connected to the third bracket net (9).

8. The integrated anaerobic ammonia oxidation denitrification device for aquaculture according to claim 3, characterized in that, The PD / A reaction zone is filled with 25%-35% biological filler (21).

9. An integrated anaerobic ammonia oxidation denitrification process for aquaculture, employing the integrated anaerobic ammonia oxidation denitrification device for aquaculture as described in any one of claims 1-8, characterized in that: S1: Water is drawn from the aquaculture wastewater collection pond, and the wastewater enters the tank (1) through the water distribution pipe (17). The water contains COD, DO and After passing through the vertical flow sedimentation zone, rapid sedimentation and degradation occur, reducing the DO concentration. The sludge will then enter the collection zone, and the effluent will be divided into two streams after passing through the vertical flow sedimentation zone. S2: After passing through the vertical flow sedimentation zone, 50% of the effluent... and It will enter the anaerobic reaction zone, where it will degrade and accumulate. and DO will inhibit Generate, and thus accumulate Some of the settled sludge will enter the sludge collection area; S3: Those leaving the anaerobic reaction zone , and It will enter the PD / A reaction zone, and the remaining 50% of the effluent in the vertical flow sedimentation zone will be... and They will also enter the PD / A reaction zone, where anaerobic ammonia oxidizing bacteria and low-oxygen conditions utilize the produced... As an inorganic carbon source, the remaining , and It will oxidize into This leads to the denitrification of the wastewater; S4: The denitrified effluent passes through filter cotton into the clean water zone and is finally discharged from the outlet. It will then be discharged from the exhaust port.

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