Anaerobic ammonia oxidation water treatment device

Abstract

The utility model discloses an anaerobic ammonia oxidation water treatment device, which relates to the technical field of sewage treatment and comprises a tank body, an exhaust port is arranged at the top of the tank body, a drain outlet is arranged at the bottom of the tank body, and a water outlet and a water inlet are respectively arranged on the side wall of the tank body. The interior of the tank body is divided into a clear water area, a PD / A reaction area, an anaerobic reaction area, a vertical flow settling area and a sewage collecting area from top to bottom. Breeding tail water enters the tank body from the vertical flow sedimentation area and passes through the anaerobic reaction area and the PD / A reaction area, clear water enters the clear water area to be discharged, and sludge enters the sewage collection area to be discharged. And the defect that the traditional nitrification and denitrification nitrogen removal reaction process is not suitable for large-flow and low-nitrogen pollution load aquaculture water treatment is overcome.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to an anaerobic ammonia oxidation water treatment device. Background Technology

[0002] Aquaculture wastewater is characterized by high COD, high DO concentration, and the coexistence of three forms of nitrogen, along with low C / N ratios, low ammonia nitrogen, and low nitrite concentrations. This results in low nitrogen removal efficiency for traditional nitrification and denitrification processes. Furthermore, traditional nitrification and denitrification processes require large land areas, high aeration volumes, consume large amounts of carbon sources, and are energy-intensive and costly, making them unsuitable for treating large flow rates and low nitrogen pollution loads in aquaculture. Current research in aquaculture water treatment mainly focuses on converting ammonia nitrogen and nitrite, which directly harm fish, into nitrate nitrogen, which is harmless to aquatic animals. It does not fundamentally remove nitrogen pollution loads from the aquaculture system. The continuous accumulation of nitrate nitrogen in the system, on the one hand, causes environmental stress to aquatic animals when it reaches a certain threshold, affecting their growth; on the other hand, under certain conditions, it can be reversed into nitrite nitrogen and ammonia nitrogen, directly endangering aquatic animals. Therefore, there is an urgent need for a new type of nitrogen removal device that is suitable for aquaculture water treatment, low in energy consumption, and highly efficient.

[0003] Therefore, an anaerobic ammonia oxidation water treatment device is needed. Utility Model Content

[0004] The purpose of this invention is to provide an anaerobic ammonia oxidation water treatment device that overcomes the shortcomings of traditional nitrification and denitrification denitrification processes, which are unsuitable for treating aquaculture water with large flow rates and low nitrogen pollution loads. The specific technical solution is as follows:

[0005] An anaerobic ammonia oxidation water treatment device includes a tank. The top of the tank has an exhaust port, the bottom of the tank has a sewage outlet, and the side walls of the tank have an outlet and an inlet. The interior of the tank 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.

[0006] Preferably, the clear water zone includes a first bracket mesh and a filter element. The first bracket mesh is installed on the inner side wall of the tank, and the filter element is installed on the first bracket mesh for filtering the effluent after treatment in the PD / A reaction zone. The outlet is located above the filter element.

[0007] Preferably, the PD / A reaction zone includes a second support net, a flow guiding unit, and an air distribution pipe. The second support net is installed on the inner side wall of the tank. The flow guiding unit is installed on the second support net to guide the water circulation within the PD / A reaction zone. The air distribution pipe is installed on the side of the second support net away from the flow guiding unit. The PD / A reaction zone is filled with biological packing material.

[0008] Preferably, the flow guiding unit includes an inner cylinder support, an inner cylinder, a flow guiding net, and an inner cylinder flow guiding plate. One end of the flow guiding net is installed on the second bracket net. The inner cylinder support is installed on the inner side wall of the tank and perpendicular to the tank axis. The inner cylinder support is located between the second bracket net and the clear water zone. The inner cylinder is installed on the inner cylinder support. The inner cylinder flow guiding plate is installed on the end of the inner cylinder near the flow guiding net. The inner cylinder and the flow guiding net are coaxial with the tank.

[0009] Preferably, the guide net is trumpet-shaped, and the end of the guide net away from the second bracket net is connected to the inner side wall of the tank, and the inner cylinder guide plate is trumpet-shaped.

[0010] Preferably, the vertical flow sedimentation zone includes a vertical flow sedimentator, a diversion unit, a third support net, and a water distribution pipe. The third support net is installed on the inner side wall of the tank and is perpendicular to the tank axis. The third support net is located between the PD / A reaction zone and the sludge collection zone. The vertical flow sedimentator is installed on the third support net.

[0011] The vertical flow sedimentation tank includes an outer shell and an inner shell. The diversion unit is installed on the top of the inner shell and is used to guide half of the tailwater entering the tank from the water distribution pipe into the anaerobic reaction zone and half into the PD / A reaction zone. One end of the water distribution pipe is connected to the water inlet, and the other end of the water distribution pipe passes through the anaerobic reaction zone and is located inside the inner shell with the port facing upward.

[0012] Preferably, the anaerobic reaction zone includes an air-water backwash pipe and a biochemical filter media, the vertical flow sedimentator is filled with biochemical filter media between itself and the inner wall of the tank, and the air-water backwash pipe is installed on the third bracket net.

[0013] Preferably, the water distribution pipe consists of a horizontal section and a vertical section, the end of the horizontal section is connected to the water inlet, and the vertical section and the vertical flow sedimentation tank are coaxial with the tank body.

[0014] Preferably, the sewage collection area includes a collection hopper, one end of which is connected to a sewage outlet, and the other end of which is connected to a third bracket net.

[0015] Preferably, the diversion unit includes a water inlet reflector, which is installed on the top of the inner shell, and the projected area of ​​the water inlet reflector about the tank axis is half of the projected area of ​​the outer shell about the tank axis.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] 1. The denitrification equipment of the present invention requires less aeration, and the theoretical oxygen demand is only 50% of that of the traditional process; in aquaculture, the high DO concentration of the influent from the aquaculture stage is used to meet the demand; only the turning of the MBBR packing and the bottom backwashing require intermittent and small-volume aeration.

[0018] 2. The denitrification equipment of the present invention consumes less organic matter than the prior art. Short-cut denitrification only consumes 20% of the carbon source, saving 80% of the carbon source. Furthermore, since the effluent comes from the influent of the aquaculture effluent collection pond (sludge collection pond), the aquaculture effluent does not lack COD.

[0019] 3. The denitrification equipment of the present invention saves the floor space of water treatment facilities, eliminating the need for additional facilities such as primary sedimentation tanks, secondary sedimentation tanks, and nitrification tanks, thereby reducing the floor space and equipment investment.

[0020] 4. The denitrification equipment of the present invention has lower energy consumption than existing equipment, with only the pressurized water pump at the inlet requiring energy, thus reducing operating costs.

[0021] 5. The nitrogen removal equipment process of the present invention is an anaerobic ammonia oxidation nitrogen removal process based on partial denitrification (PD / A), which is beneficial for enriching and cultivating functional microorganisms in the reactor and improving the substrate exposure level. It overcomes the shortcomings of traditional full-process nitrification-denitrification nitrogen removal processes that are not suitable for the treatment of aquaculture wastewater with large flow rates, low nitrogen loads, and low C / N ratios, thereby improving nitrogen removal efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Explanation of key figure labels:

[0025] 1. Tank body; 2. Exhaust port; 3. Sewage outlet; 4. Water outlet; 5. Water inlet; 6. First support mesh; 7. Second support mesh; 8. Inner cylinder support; 9. Third support mesh; 10. Filter element; 11. Inner cylinder; 12. Flow guide mesh; 13. Inner cylinder flow guide plate; 14. Air distribution pipe; 15. Air-water backwash pipe; 16. Vertical flow sedimentator; 1601. Outer shell; 1602. Inner shell; 17. Water distribution pipe; 18. Collection hopper; 19. Water quality testing port; 20. Water inlet reflector; 21. Biological packing material. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Next, the working principle of this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0028] An anaerobic ammonia oxidation water treatment device includes a tank 1. The tank 1 has an exhaust port 2 at the top and a drain port 3 at the bottom. The side walls of the tank 1 have an outlet 4 and an inlet 5. The interior of the tank 1 is divided from top to bottom into a clear water zone, a PD / A reaction zone, an anaerobic reaction zone, a vertical flow sedimentation zone, and a sludge collection zone. A water quality monitoring port 19 in the anaerobic reaction zone is located at the top and is used to detect the substrate concentration in the effluent from the anaerobic zone, as well as the accumulation of substrates such as ammonia nitrogen and nitrite, and the decrease in dissolved oxygen. The water quality monitoring port 19 in the PD / A reaction zone is used to monitor the removal of ammonia nitrogen and nitrite, dissolved oxygen control, and temperature conditions of the water sample from the PD / A reaction zone.

[0029] The clear water zone includes a first support mesh 6 and a filter element 10. The first support mesh 6 is installed on the inner wall of the tank 1 and perpendicular to the axis of the tank 1. The filter element 10 is installed on the first support mesh 6 and is used to filter the effluent after treatment in the PD / A reaction zone. The outlet 4 is located above the filter element 10. The effluent after filtration by the filter element 10 has achieved denitrification and is therefore discharged from the outlet 4. The nitrogen gas generated in the PD / A reaction zone is discharged from the exhaust port 2. The filter element 10 includes filter sponge, filter cotton, and acrylic fiber, etc.

[0030] The second support net 7 is installed on the inner wall of tank 1 and perpendicular to the axis of tank 1. One end of the guide net 12 is installed on the second support net 7. The guide net 12 is used to guide the tailwater floating from the vertical sedimentation zone into the inner cylinder 11. After leaving the inner cylinder 11 at the end away from the guide net 12, part of it flows downward back to the guide net 12 to form a circulating flow, ensuring that the tailwater undergoes a full reaction in the PD / A reaction zone. The inner cylinder support 8 is installed on the inner wall of tank 1 and perpendicular to the axis of tank 1. The inner cylinder support 8 is located between the second support net 7 and the clear water zone. The air distribution pipe 14 is installed on the side of the second support net 8 away from the guide net 12. The air distribution pipe is spirally arranged on the second support net 2-3 times to increase the uniformity of air distribution. The gas introduced by the air distribution pipe 14 is air, which utilizes the CO2 in the air to react with the CO2 in the tailwater. The reaction generates N2, separating nitrogen from the effluent. The inner cylinder 11 is mounted on the inner cylinder support 8, and the inner cylinder guide plate 13 is mounted on the end of the inner cylinder 11 near the guide net 12. The inner cylinder 11 and the guide net 12 are coaxial with the tank body 1. The inner cylinder guide plate 13 is used to guide most of the water that floats from the vertical flow sedimentation zone into the inner cylinder 11, ensuring the stability of the circulating water flow.

[0031] The guide net 12 is funnel-shaped with its opening facing upwards. The end of the guide net 12 away from the second bracket net 7 is connected to the inner wall of the tank 1. The inner cylinder guide plate 13 is funnel-shaped with its opening facing downwards. It is used to guide the biological packing material 21 that sinks with the downflow to gather on the second bracket net 7 and rise into the inner cylinder 11 under the push of the air in the air distribution pipe 14, so as to ensure that the biological packing material 21 is evenly circulated and turned, and fully contacted the water matrix and reacted.

[0032] The PD / A reaction zone is filled with 30% volume of materials such as K3 / K5 / SDC to retain and adsorb activated sludge, and to acclimate and enrich anaerobic ammonia oxidizing bacteria. The biological packing material 21 maintains a volume density of 25%-35%, which is more conducive to the growth of anaerobic ammonia oxidizing bacteria.

[0033] The space between the outer shell 1601 and the inner wall of the tank 1 is filled with biological filter media, such as bio-balls and ceramic granules. The air-water backwash pipe 15 is installed on the third bracket mesh 9 for backwashing to prevent clogging of the anaerobic layer packing material over time. The anaerobic reaction zone is used to degrade suspended solids and soluble COD in the water, respectively through the ammonification of organic matter by ammonifying bacteria and the reduction of nitrate nitrogen by low dissolved oxygen (DO). Short-range denitrification produces cumulative effects and To continuously provide a sufficient concentration of reaction matrix for the denitrification reaction in the PD / A reaction zone, thereby improving the denitrification effect.

[0034] The third support mesh 9 is installed on the inner wall of tank 1 and perpendicular to the axis of tank 1. The third support mesh 9 is located between the PD / A reaction zone and the sludge collection zone. The vertical flow sedimentator 16 is installed on the third support mesh 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 and is used to reflect the inlet water, limit the flow, and guide the settled sludge in the PD / A reaction zone to the bottom sludge collection zone. The projected area of ​​the inlet reflector 20 about the axis of tank 1 is half the projected area of ​​the outer shell 1601 about the axis of tank 1. It restricts 50% of the inlet water from entering the PD / A reaction zone through the anaerobic zone, and the other 50% of the inlet water rises from between the outer shell 1601 and the inner shell 1602 after sedimentation and enters the PD / A reaction zone. One end of the water distribution pipe 17 is connected to the inlet 5, and the other end of the water distribution pipe passes through the anaerobic reaction zone and is located inside the inner shell with the port facing upward. The vertical flow sedimentation tank 16 is used to allow the sludge in the effluent to settle into the collection area for collection and discharge. The effluent from the inlet 5 comes from the aquaculture effluent collection tank. Aquaculture effluent does not lack COD, and it is even lower than existing technologies. Short-cut denitrification only consumes 20% of the carbon source, saving 80% of the carbon source.

[0035] The water distribution pipe 17 consists of a horizontal section and a vertical section. The end of the horizontal section is connected to the water inlet 5. The vertical section and the vertical flow sedimentation tank 16 are coaxial with the tank body 1. The water distribution allows the tailwater to fully interact with the vertical flow sedimentation tank 16, so that the sludge can be better settled and separated.

[0036] The sewage collection area includes a collection hopper 18, which is conical. One end of the cone of the collection hopper 18 is connected to the sewage outlet 3, and the other end of the collection hopper 18 is connected to the third support net 9.

[0037] The process flow of this device is as follows:

[0038] S1: Water enters from the aquaculture wastewater collection pond (sludge 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, and the sludge will enter the collection zone.

[0039] S2: After passing through the vertical flow sedimentation zone, 50% and It will enter the anaerobic reaction zone, where it will degrade and accumulate. With CO2, DO will inhibit Generate, and thus accumulate Some of the settled sludge will enter the sludge collection area;

[0040] S3: Those leaving the anaerobic reaction zone CO2 will enter the PD / A reaction zone, and the remaining 50% of the vertical flow sedimentation zone will... and They will also enter the PD / A reaction zone, where anaerobic ammonia oxidizing bacteria and low-oxygen conditions will produce the remaining... Restore to and It will be oxidized into N2, thus denitrifying the effluent;

[0041] S4: The denitrified effluent passes through the filter and enters the clean water zone, and is finally discharged from the outlet. N2 will be discharged from the exhaust port.

[0042] System startup and operation:

[0043] (1) Pre-culture of anaerobic ammonia oxidizing bacteria: biofilm sludge rich in anaerobic ammonia oxidizing bacteria was used as the inoculum source for rapid system startup;

[0044] (2) MBBR hydrophilic biological packing material 21 was used to intercept and adsorb activated sludge, and anaerobic ammonia oxidizing bacteria were domesticated and enriched, with a filling rate of 30%.

[0045] (3) Intermittent aeration, with strict control of DO (≤1mg / L);

[0046] (4) Control the temperature (25-35℃, which is basically consistent with the 20-30℃ for aquaculture);

[0047] (5) Control the pH value (7-8.5, which is in complete agreement with the requirements of aquaculture).

[0048] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. An anaerobic ammonia oxidation water treatment device, 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 sedimentation zone, and a sludge collection zone from top to bottom. The PD / A reaction zone includes a second support net (7), a flow guiding unit, and an air distribution pipe (14). The second support net (7) is installed on the inner side wall of the tank (1). The flow guiding unit is installed on the second support net (7) to guide the water flow circulation in the PD / A reaction zone. The air distribution pipe (14) is installed on the side of the second support net (7) away from the flow guiding unit. The PD / A reaction zone is filled with biological packing material (21). The PD / A reaction zone is used to denitrify the effluent.

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

3. The anaerobic ammonia oxidation water treatment device according to claim 1, characterized in that, The flow guiding unit includes an inner cylinder support (8), an inner cylinder (11), a flow guiding net (12), and an inner cylinder flow guiding plate (13). One end of the flow guiding net (12) is installed on the second bracket net (7). The inner cylinder support (8) is installed on the inner side 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 area. The inner cylinder (11) is installed on the inner cylinder support (8). The inner cylinder flow guiding plate (13) is installed on the end of the inner cylinder (11) near the flow guiding net (12). The inner cylinder (11) and the flow guiding net (12) are coaxial with the tank (1).

4. The anaerobic ammonia oxidation water treatment device according to claim 3, characterized in that, The guide net (12) is trumpet-shaped, and the end of the guide net (12) away from the second bracket net (7) is connected to the inner wall of the tank (1). The inner cylinder guide plate (13) is trumpet-shaped.

5. The anaerobic ammonia oxidation water treatment device according to claim 1, characterized in that, The vertical flow sedimentation zone includes a vertical flow sedimentator (16), a diversion unit, a third bracket net (9), 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 PD / A reaction zone and the sludge collection zone. The vertical flow sedimentator (16) is installed on the third bracket net (9) and is used to degrade the sludge in the sedimentation tailwater. The vertical flow sedimentation tank (16) includes an outer shell (1601) and an inner shell (1602). The diversion unit is installed on the top of the inner shell (1602) to guide half of the tailwater entering the tank from the water distribution pipe (17) into the anaerobic reaction zone and half into the PD / A reaction zone. One end of the water distribution pipe (17) is connected to the water inlet (5), and 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.

6. The anaerobic ammonia oxidation water treatment device according to claim 5, characterized in that, The anaerobic reaction zone includes an air-water backwash pipe (15) and a biochemical filter material. The vertical flow sedimentation tank (16) and the inner wall of the tank (1) are filled with biochemical filter material. The air-water backwash pipe (15) is installed on the third bracket net (9). The anaerobic reaction zone is used to breed anaerobic ammonia oxidizing bacteria.

7. The anaerobic ammonia oxidation water treatment device according to claim 5, characterized in that, 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), and the vertical part and the vertical flow sedimentation tank (16) are coaxial with the tank body (1).

8. The anaerobic ammonia oxidation water treatment device according to claim 5, characterized in that, The sewage collection area includes a collection hopper (18), one end of which is connected to the sewage outlet (3), and the other end of which is connected to the third bracket net (9).

9. An anaerobic ammonia oxidation water treatment device according to claim 5, characterized in that, The diversion unit includes a water inlet reflector (20), which is installed on the top of the inner shell (1602). The projected area of ​​the water 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).

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