Novel efficient anaerobic ammonia oxidation reactor

Abstract

The utility model relates to the field of biological denitrification of sewage, and discloses a novel efficient anaerobic ammonia oxidation reactor which comprises a reaction zone and a gas backflow system, the reaction zone comprises an inner cylinder, an outer cylinder, a water inlet, a water outlet, a sludge discharge port and a three-phase separation zone, the three-phase separation zone is arranged in the middle of the reaction zone, and the gas backflow system is arranged in the three-phase separation zone. The three-phase separation area comprises angle steel and a gas collection cone, the angle steel is distributed along the circumference between the inner cylinder and the outer cylinder, the gas collection cone is connected with a gas backflow system, and the gas backflow system is arranged at the top and the outer part of the reaction area and comprises a gas collection assembly and a gas flow guide assembly. The gas collection assembly can collect generated gas in situ in the anaerobic ammonia oxidation reactor, the occupied area and the cost are saved, the breathing opening can collect escaped gas, the gas collection efficiency is further improved, the gas flow guide assembly can recycle the gas collected by the gas collection assembly, the generated gas is introduced into the anaerobic ammonia oxidation reactor, and the gas collection efficiency is improved. And the mass transfer effect is optimized through gas stirring.

Description

Technical Field

[0001] The utility model relates to the field of biological sewage denitrification, in particular to an anaerobic ammonium oxidation reactor for realizing efficient denitrification by enhancing mass transfer. Background Technique

[0002] At present, the removal of nitrogen in urban sewage mainly relies on biological denitrification. Traditional biological denitrification methods convert nitrogen in sewage into nitrogen gas through nitrification and denitrification. However, due to the low carbon-nitrogen ratio in urban sewage, a series of problems such as high energy consumption, the need for additional carbon sources, large sludge production, and the generation of a large amount of greenhouse gases occur in existing urban sewage treatment plants.

[0003] The anaerobic ammonium oxidation technology is a new type of autotrophic denitrification technology, which has the advantages of not requiring the addition of carbon sources, saving aeration energy consumption, and low production of excess sludge. However, the anaerobic ammonium oxidation technology also has certain problems. As the anaerobic ammonium oxidation bacteria grow and reproduce, dead zones are likely to be generated. Uneven substrate mass transfer will inhibit the anaerobic ammonium oxidation bacteria, causing sludge floating, a large loss of biomass in the reaction zone, and ultimately leading to the deterioration of the system function.

[0004] In practical engineering, mechanical stirring is often used in the reactors commonly used for the anaerobic ammonium oxidation technology to enhance the mass transfer effect. However, this method has high energy consumption, high noise, high cost, and the rapid stirring will also break the anaerobic ammonium oxidation sludge. Moreover, dead zones may still be generated at the bottom of the reaction zone. Therefore, developing a new type of anaerobic ammonium oxidation reactor for enhancing mass transfer and realizing high efficiency is still a problem to be solved. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a new type of high-efficiency anaerobic ammonium oxidation reactor, which solves the problems raised in the above background technique.

[0006] The utility model provides the following technical solutions:

[0007] A high-efficiency anaerobic ammonium oxidation reactor, including a reaction zone (11) and a gas reflux system, characterized in that the reaction zone includes an outer cylinder (10) and an inner cylinder (16) arranged inside the outer cylinder (10), and the middle part of the reaction zone is a three-phase separation zone;

[0008] The described gas reflux system includes a gas collection component and a gas diversion component. Among them, the gas collection component is sleeved on the upper part of the three-phase separation zone, and includes a gas storage buffer tank (2), a gas collection pipe (14), and a gas collection cone (12). A water return hole (15) is provided in the gas storage buffer tank (2), and is located at the connection between the gas storage buffer tank (2) and the gas collection pipe (14), for returning the liquid from the gas storage buffer tank (2) to the reaction zone (11); an air outlet (1) and a breathing port (3) are provided on the gas storage buffer tank (2), the breathing port (3) opens downward and extends between the outer cylinder (10) and the gas collection pipe (14), for collecting the gas between the outer cylinder (10) and the gas collection pipe (14), and discharging the excess gas when there is too much gas in the gas storage buffer tank (2); one end of the gas collection pipe (14) extends into the gas storage buffer tank (2), and the other end is connected to the inner cylinder (16) through the gas collection cone (12). The gas collection cone (12) is located in the three-phase separation zone and is distributed along the circumference on the inner cylinder (16). The gas diversion component includes a gas pump (8) and a connecting pipe (5). The input end of the gas pump (8) is connected to the air outlet (1) of the gas storage buffer tank (2) through the connecting pipe (5), and the output end is connected to the air inlet (7) at the bottom of the reaction zone (11) through the connecting pipe (5).

[0009] Preferably, the gas collection component is composed of a breathing port, a gas storage buffer tank, a gas collection pipe, and a gas collection cone. Each part is constructed of stainless steel material, which can prevent deformation caused by increased internal air pressure during subsequent use.

[0010] Preferably, the surfaces of the breathing port, the gas storage buffer tank, the gas collection pipe, and the gas collection cone are coated with an anti-corrosion coating to improve the service life.

[0011] Preferably, a water return hole is installed in the gas storage buffer tank. The liquid entering the gas storage buffer tank through the gas collection pipe can return to the reaction zone through the water return hole, avoiding the liquid entering the gas diversion component through the gas storage buffer tank and causing damage to the gas pump, providing a preparatory plan for emergencies.

[0012] Preferably, the water return hole is located at the connection between the gas storage buffer tank and the gas collection pipe, minimizing the water level of the liquid entering the gas storage buffer tank to the greatest extent.

[0013] Preferably, the breathing port opens downward and extends between the outer cylinder and the gas collection pipe to collect the gas between the outer cylinder and the gas collection pipe, increasing the gas reflux amount and enhancing the mass transfer effect. When there is too much gas in the gas storage buffer tank, the excess gas can be discharged through the breathing port, and the breathing port can balance the pressure in the gas storage buffer tank.

[0014] Preferably, angle steels are evenly distributed along the circumference between the three-phase separation zone, the inner cylinder and the outer cylinder, for enhancing the structural strength of the reaction zone and the solid-liquid separation effect.

[0015] Preferably, the gas collection cone is connected to the gas collection pipe, and the downward opening is 60°, which improves the three-phase separation efficiency and prevents solids from entering the gas storage buffer tank through the gas collection pipe, having an adverse impact on the gas reflux system.

[0016] Preferably, the gas diversion assembly is composed of a gas pump and a connecting pipe, and the pipe bodies are all made of rigid pipes to enhance the compressive capacity.

[0017] Preferably, the input section of the gas pump is connected to the outlet of the gas storage buffer tank, and the output end of the gas pump is connected to the bottom inlet of the reaction zone. The gas pump can automatically adjust the intake air volume to optimize the mass transfer effect.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] 1. The gas collection assembly provided in the present utility model can in-situ collect the generated gas in the anaerobic ammonium oxidation reactor, saving floor area and cost. The provided breathing port can also collect the escaped gas, further improving the gas collection efficiency and enhancing the shock resistance of anaerobic ammonium oxidizing bacteria. The provided return water hole can prevent the water flow from flowing back into the gas storage buffer tank, providing a preparatory plan for emergencies.

[0020] 2. The gas diversion assembly provided in the present utility model can recycle the gas collected by the gas collection assembly, introduce the generated gas into the anaerobic ammonium oxidation reactor, and the gas stirring makes the mud and water fully mixed and contacted, which can save the energy consumption generated by mechanical stirring, and avoid problems such as high noise, high cost, and improper stirring breaking the anaerobic ammonium oxidation granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the high-efficiency anaerobic ammonium oxidation reactor of the present utility model.

[0022] In the figure: 1. Outlet; 2. Gas storage buffer tank; 3. Breathing port; 4. Angle steel; 5. Connecting pipe; 6. Sludge discharge port; 7. Inlet; 8. Gas pump; 9. Water inlet; 10. Outer cylinder; 11. Reaction zone; 12. Gas collection cone; 13. Water outlet; 14. Gas collection pipe; 15. Return water hole; 16. Inner cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figure 1, An efficient anaerobic ammonium oxidation reactor, comprising a reaction zone 11 and a gas reflux system. The reaction zone includes an inner cylinder 16, an outer cylinder 10, a water inlet 9, a water outlet 13, a sludge discharge port 6, and a three-phase separation zone. A three-phase separation zone is provided in the middle of the reaction zone 11. The three-phase separation zone includes angle steels 4 and a gas collection cone 12. The angle steels 4 are distributed circumferentially between the inner cylinder 16 and the outer cylinder 10. The gas collection cone 12 is connected to the gas reflux system. A gas reflux system is provided at the top of the reaction zone 11 and outside the anaerobic ammonium oxidation reactor, including a gas collection assembly and a gas diversion assembly. The gas collection assembly is sleeved on the upper part of the three-phase separation zone of the reaction zone 11, and the gas diversion assembly is sleeved outside the anaerobic ammonium oxidation reactor. The gas collection assembly is composed of a breathing port 3, a gas storage buffer tank 2, a gas collection pipe 14, and a gas collection cone 12. Each part is constructed of stainless steel material, which can prevent deformation caused by the increase of internal air pressure during subsequent use. The surfaces of the breathing port 3, the gas storage buffer tank 2, the gas collection pipe 14, and the gas collection cone 12 are coated with an anti-corrosion coating to improve the service life.

[0025] A return water hole 15 is installed in the gas storage buffer tank, located at the connection between the gas storage buffer tank 2 and the gas collection pipe 14. The liquid entering the gas storage buffer tank 2 through the gas collection pipe 14 can return to the reaction zone 11 through the return water hole 15, avoiding the liquid entering the gas diversion assembly through the gas storage buffer tank 2 and causing damage to the air pump 8. The water level of the liquid entering the gas storage buffer tank 2 is minimized to provide a contingency plan for emergencies. The breathing port 3 opens downward and extends between the outer cylinder 10 and the gas collection pipe 14 to collect the gas between the outer cylinder 10 and the gas collection pipe 14, increasing the gas reflux volume and enhancing the mass transfer effect. When there is too much gas in the gas storage buffer tank 2, the excess gas can be discharged through the breathing port 3, and the breathing port 3 can balance the pressure in the gas storage buffer tank 2. The gas collection cone 12 is connected to the gas collection pipe 14 and opens downward at an angle of 60°, preventing solids from entering the gas storage buffer tank 2 through the gas collection pipe and causing pipeline blockage, and improving the three-phase separation efficiency. The gas diversion assembly is composed of an air pump 8 and a connecting pipe 5, and the pipe bodies are all made of rigid pipes to enhance the compressive capacity. The input section of the air pump 8 is connected to the air outlet of the gas storage buffer tank 2, and the output end of the air pump 8 is connected to the bottom air inlet 7 of the reaction zone 11. The air pump 8 can automatically adjust the air intake volume to optimize the mass transfer effect.

[0026] Working principle: During use, the muddy water rises under the action of gas stirring. A part of the muddy water mixture reaches the gas collecting cone 12 and then turns back to the bottom of the reaction zone 11 from the outer cylinder 10. A part of the muddy water mixture undergoes solid-liquid separation when passing between the gas collecting cone 12 and the outer cylinder 10, and the supernatant is discharged through the water outlet 13. Since the gas production in the early stage of the anaerobic ammonium oxidation reactor is small, nitrogen needs to be additionally introduced through the breathing port 3 for gas stirring. As the anaerobic ammonium oxidation reactor operates normally, the gas production gradually replaces the amount of nitrogen introduced additionally. After the gas enters the reaction zone 11 from the bottom of the anaerobic ammonium oxidation reactor for stirring, it returns to the gas storage buffer tank 2 again with the newly generated gas in the reaction zone 11 to form a cycle. When too much gas is generated in the later stage of the operation of the anaerobic ammonium oxidation reactor, the excess gas can be discharged through the breathing port 3 to balance the pressure in the gas storage buffer tank 2 and optimize the gas stirring effect. If the mixture overflows into the gas storage buffer tank through the gas collecting pipe 14, it can flow back to the reaction zone 11 through the water return hole 15 to avoid adverse effects of the mixture on the gas reflux system.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. At the same time, in the drawings of the present utility model, the filling patterns are only for distinguishing layers and are not subject to any other limitations.

[0028] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel high-efficiency anaerobic ammonium oxidation reactor, comprising a reaction zone (11) and a gas reflux system, characterized in that: The reaction zone comprises an outer cylinder (10) and an inner cylinder (16) arranged in the outer cylinder (10), and the middle part of the reaction zone is a three-phase separation zone; The gas reflux system comprises a gas collecting component and a gas guiding component, wherein the gas collecting component is mounted on the upper part of the three-phase separation zone, and comprises a gas storage buffer tank (2), a gas collecting pipe (14) and a gas collecting cone (12); a water return hole (15) is provided in the gas storage buffer tank (2) and is located at the connection between the gas storage buffer tank (2) and the gas collecting pipe (14), and is used to return liquid from the gas storage buffer tank (2) to the reaction zone (11); the gas storage buffer tank (2) is provided with a gas outlet (1) and a breathing port (3); the breathing port (3) opens downward and extends between the outer cylinder (10) and the gas collecting pipe (14), and is used to collect gas from the outer cylinder (10) and the gas collecting pipe (14). The gas collecting pipe (14) collects gas between the gas storage buffer tank (2) and discharges excess gas when there is too much gas in the gas storage buffer tank (2); one end of the gas collecting pipe (14) extends into the gas storage buffer tank (2), and the other end is connected to the inner cylinder (16) through a gas collecting cone (12), the gas collecting cone (12) is located in the three-phase separation zone, and is distributed on the inner cylinder (16) along the circumference, the gas guide component includes an air pump (8) and a connecting pipe (5), the input end of the air pump (8) is connected to the gas outlet (1) of the gas storage buffer tank (2) through the connecting pipe (5), and the output end is connected to the gas inlet (7) at the bottom of the reaction zone (11) through the connecting pipe (5).

2. The high-efficiency anaerobic ammonium oxidation reactor according to claim 1, characterized in that: The bottom of the reaction zone is provided with a mud discharge port (6), the lower part is provided with a water inlet (9), and the middle three-phase separation zone is provided with a water outlet (13).

3. The high-efficiency anaerobic ammonium oxidation reactor according to claim 1, characterized in that: The surfaces of the breathing port (3), the gas storage buffer tank (2), the gas collecting pipe (14) and the gas collecting cone (12) are coated with an anti-corrosion coating.

4. The high-efficiency anaerobic ammonium oxidation reactor according to claim 1, characterized in that: The surfaces of the breathing port (3), the gas storage buffer tank (2), the gas collecting pipe (14) and the gas collecting cone (12) are coated with an anti-corrosion coating.

5. The high-efficiency anaerobic ammonium oxidation reactor according to claim 1, characterized in that: Angle steels (4) are evenly distributed along the circumference between the three-phase separation zone, the inner tube (16) and the outer tube (10) to enhance the structural strength of the reaction zone and the solid-liquid separation effect.

6. The high-efficiency anaerobic ammonium oxidation reactor according to claim 1 or 5, characterized in that: The gas collecting cone (12) opens downward at 60° to prevent solid blockage and improve the three-phase separation efficiency.

7. The high-efficiency anaerobic ammonium oxidation reactor according to claim 6, characterized in that: After reaching the gas collecting cone (12), part of the mud-water mixture returns to the bottom of the reaction zone (11) and is discharged through the mud discharge port (6); and part of the mud-water mixture undergoes solid-liquid separation between the gas collecting cone (12) and the outer cylinder (10), so that the supernatant is discharged through the water outlet (13).

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