An anaerobic ammonia oxidation treatment device for high-ammonia-nitrogen wastewater

Abstract

This utility model relates to an anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater, comprising a reaction tank, an aeration assembly, an inlet assembly, a three-phase separator, and a packing layer. The aeration assembly has an upward-facing aeration end and is installed in the middle of the reaction tank. The reaction tank is located above the aeration assembly, forming an aerobic nitrification zone, and below the aeration assembly, forming an anaerobic ammonia oxidation zone. A mixing zone is formed at the bottom of the reaction tank, below the anaerobic ammonia oxidation zone. The inlet end of the inlet assembly is connected to the mixing zone. The packing layer is installed in the anaerobic ammonia oxidation zone and serves as a carrier for anaerobic ammonia oxidizing bacteria. The aerobic and anaerobic reactions are treated separately to avoid the inhibition and interference of molecular oxygen on anaerobic ammonia oxidizing bacteria. At the same time, the packing layer effectively supports the anaerobic ammonia oxidizing bacteria, preventing loss and improving water treatment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to an anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater. Background Technology

[0002] Traditional nitrification-denitrification biological nitrogen removal methods refer to the process by which microorganisms gradually oxidize ammonia nitrogen in wastewater into nitrite and nitrate under aerobic conditions, and then gradually reduce nitrate into nitrite and nitrogen gas under anoxic conditions. The process is: ammonia nitrogen → nitrite nitrogen → nitrate nitrogen → nitrite nitrogen → nitrogen gas. This method has a long nitrogen removal process, requires a large amount of carbon source (C / N > 4), and has high operating costs.

[0003] To address the shortcomings of traditional nitrogen removal methods, a short-cut nitrification coupled with anaerobic ammonia oxidation (ANAO) method has been developed. Under aerobic conditions, nitrifying bacteria oxidize a portion of ammonia nitrogen to nitrite nitrogen, and then, under anaerobic conditions, ammonia nitrogen acts as the electron donor and nitrite nitrogen as the electron acceptor, while nitrite nitrogen acts as the electron acceptor. or Using anaerobic ammonia-oxidizing bacteria as a carbon source, this method oxidizes ammonia nitrogen into nitrogen gas. It does not require an external carbon source and has low operating costs.

[0004] However, since nitrifying bacteria are aerobic and anaerobic ammonia oxidizing bacteria are anaerobic, the presence of molecular oxygen in the same reaction tank will have a significant inhibitory and interfering effect on anaerobic ammonia oxidizing bacteria, affecting the denitrification efficiency. Moreover, the doubling cycle of anaerobic ammonia oxidizing bacteria is as long as 10-30 days, and they are easily lost, which limits the application of anaerobic ammonia oxidation process. Utility Model Content

[0005] In view of this, it is necessary to provide an anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater to solve the problem that, since nitrifying bacteria are aerobic and anaerobic ammonia oxidizing bacteria are anaerobic, the presence of molecular oxygen in the same reaction tank will have a significant inhibitory and interfering effect on anaerobic ammonia oxidizing bacteria, affecting denitrification efficiency. Moreover, the doubling cycle of anaerobic ammonia oxidizing bacteria is as long as 10-30 days, and they are easily lost, which limits the application of anaerobic ammonia oxidation process.

[0006] This invention provides an anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater, comprising a reaction tank, an aeration assembly, an inlet assembly, a three-phase separator, and a packing layer. The aeration assembly has an upward-facing aeration end and is installed in the middle of the reaction tank. The reaction tank, located above the aeration assembly, forms an aerobic nitrification zone, and located below the aeration assembly, forms an anaerobic ammonia oxidation zone. The bottom of the reaction tank, located below the anaerobic ammonia oxidation zone, forms a mixing zone. The inlet end of the inlet assembly is connected to the mixing zone. The three-phase separator is installed at the top of the aerobic nitrification zone, with an outlet end and an exhaust end at the top, and a return end connected to the mixing zone at the bottom. The packing layer is installed in the anaerobic ammonia oxidation zone and serves as a carrier for anaerobic ammonia oxidizing bacteria.

[0007] Furthermore, the aeration assembly includes an air source, an aeration pipe, and a plurality of aeration nozzles arranged in an array in a horizontal plane. The air inlet end of the aeration pipe is connected to the air source, and the air outlet end of the aeration pipe extends into the reaction tank and is connected to the plurality of aeration nozzles.

[0008] Furthermore, the water inlet assembly includes an inlet pipe and a distribution pipe. One end of the inlet pipe is connected to a sewage source, and the other end of the inlet pipe extends into the mixing zone of the reaction tank and is connected to the distribution pipe. The top of the distribution pipe is provided with multiple distribution holes.

[0009] Furthermore, the water distribution pipe includes multiple coaxially arranged annular pipes, all of which are connected to the water inlet pipe, and each of the multiple annular pipes has multiple water distribution holes evenly arranged along its circumference at its top end.

[0010] Furthermore, the three-phase separator includes an outer cylinder, an inner cylinder, an outlet weir, and a return pipe. The outer cylinder is fixedly connected to the reaction tank, and the inner cylinder is disposed inside the outer cylinder and fixedly connected to the reaction tank. The top of the inner cylinder is higher than the top of the outer cylinder, and a separation channel is formed between the inner cylinder and the outer cylinder. The outlet weir is fixedly connected to the inner wall above the inner cylinder. The top end of the return pipe is connected to the bottom of the outer cylinder, and the bottom end of the return pipe extends into the mixing zone.

[0011] Furthermore, the bottoms of both the outer cylinder and the inner cylinder are conical, and the separation channel includes a sinking channel extending vertically and a guide channel pointing to the top of the return pipe.

[0012] Furthermore, the packing layer includes multiple vertically arranged rope-like packings, the top and bottom ends of which are fixedly connected to the inner wall of the reaction tank via connecting rods.

[0013] Furthermore, it also includes a stirrer, which is installed in the mixing zone of the reaction tank and located above the water inlet assembly.

[0014] Furthermore, there are multiple stirrers, which are evenly arranged around the circumference of the mixing zone and close to the inner wall of the reaction tank, with the output end of each stirrer pointing towards the center of the mixing zone.

[0015] Furthermore, the height of the stirrer is greater than the height of the bottom end of the return pipe.

[0016] Compared with existing technologies, the aeration component has an upward-facing aeration end installed in the middle of the reaction tank. Therefore, the reaction tank can be divided into an upper aerobic nitrification zone and a lower anaerobic ammonium oxidation zone. Wastewater is introduced into the mixing zone through the inlet component, where wastewater, sludge, and nitrite are fully mixed. Then, it enters the anaerobic ammonium oxidation zone, where ammonia nitrogen in the wastewater reacts with nitrite to generate nitrogen gas. The gas then enters the aerobic ammonium oxidation zone, where oxygen is supplied by an aerator. Nitrifying bacteria oxidize the remaining ammonia nitrogen into nitrite. Finally, the gas enters the three-phase separator, where nitrogen gas and excess air are discharged through the exhaust end. The treated water is discharged from the effluent end, and the sludge and nitrified liquid are returned to the mixing zone. In the above reaction, the aerobic and anaerobic reactions are treated separately, avoiding the inhibition and interference of molecular oxygen on anaerobic ammonium oxidizing bacteria. At the same time, the packing layer can effectively support anaerobic ammonium oxidizing bacteria, preventing loss and improving water treatment efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater provided in this embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the central water inlet assembly. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figure 1As shown, this utility model provides an anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater, including a reaction tank 100, an aeration component 200, an influent component 300, a three-phase separator 400, and a packing layer 500. The aeration component 200 has an upward-facing aeration end and is installed in the middle of the reaction tank 100. The reaction tank 100 is located above the aeration component 200, forming an aerobic nitrification zone 110, and is located below the aeration component 200, forming an anaerobic ammonia oxidation zone 12. 0. A mixing zone 130 is formed at the bottom of the reaction tank 100 and below the anaerobic ammonia oxidation zone 120; the inlet end of the inlet component 300 is connected to the mixing zone 130; a three-phase separator 400 is installed at the top of the aerobic nitrification zone 110, with an outlet end and an exhaust end at the top of the three-phase separator 400, and a return end connected to the mixing zone 130 at the bottom of the three-phase separator 400; a packing layer 500 is installed in the anaerobic ammonia oxidation zone 120 and serves as a carrier for anaerobic ammonia oxidizing bacteria.

[0021] In practice, the aeration component 200 has an upward-facing aeration end and is installed in the middle of the reaction tank 100. Therefore, the reaction tank 100 can be divided into an upper aerobic nitrification zone 110 and a lower anaerobic ammonia oxidation zone 120. Wastewater is introduced into the mixing zone 130 through the influent component 300. Wastewater, sludge, and nitrite are thoroughly mixed in the mixing zone 130, and then enter the anaerobic ammonia oxidation zone 120. The ammonia nitrogen in the wastewater reacts with the nitrite to generate nitrogen gas, which then enters the aerobic ammonia oxidation zone 120. In the nitrification zone, oxygen is supplied by an aerator, and nitrifying bacteria oxidize the remaining ammonia nitrogen into nitrite, which eventually enters the three-phase separator 400. Nitrogen and excess air are discharged through the exhaust end, and the treated water is discharged from the effluent end. The sludge and nitrified liquid are returned to the mixing zone 130. In the above reactions, aerobic and anaerobic reactions are treated separately to avoid the inhibition and interference of molecular oxygen on anaerobic ammonia oxidizing bacteria. At the same time, the packing layer 500 can effectively support anaerobic ammonia oxidizing bacteria, prevent loss, and improve water treatment efficiency.

[0022] In this embodiment, the aeration component 200 has an upward-facing aeration end and is installed in the middle of the reaction tank 100. Using the location of the aeration component 200 as a dividing line, the interior of the reaction tank 100 can be divided into an aerobic nitrification zone 110 above the aeration component 200 and an anaerobic ammonia oxidation zone 120 below the aeration component 200. The aerobic nitrification zone 110 oxidizes some ammonia nitrogen to nitrite nitrogen and needs to maintain a slightly alkaline environment, with a pH preferably set to 7.2-8.5 and a temperature maintained at 20-35℃. The anaerobic ammonia oxidation zone 120 has a pH preferably set to 7.0-8.0 and a temperature maintained at 25-38℃. Anaerobic ammonia oxidizing bacteria use nitrite as an electron acceptor to convert the remaining ammonia nitrogen into nitrogen gas.

[0023] In one embodiment, the aeration assembly 200 includes an air source, an aeration pipe, and a plurality of aeration nozzles arranged in an array in a horizontal plane. The air inlet end of the aeration pipe is connected to the air source, and the air outlet end of the aeration pipe extends into the reaction tank 100 and is connected to the plurality of aeration nozzles.

[0024] In this process, dissolved oxygen in the aerobic nitrification zone 110 is controlled at 1.5-2.5 mg / L through microporous aeration, providing oxygen for aerobic nitrifying bacteria to oxidize ammonia nitrogen into nitrite.

[0025] The aeration component 200 can supply oxygen to the aerobic nitrification zone 110 of the reaction tank 100, while the anaerobic ammonia oxidation zone 120 presents an anaerobic environment, thus avoiding the presence of molecular oxygen from having a significant inhibitory and interfering effect on anaerobic ammonia oxidizing bacteria.

[0026] In this embodiment, the wastewater containing ammonia nitrogen to be treated is introduced into the reaction tank 100 through the inlet component 300. First, the wastewater is introduced into the mixing zone 130 of the reaction tank 100. After the wastewater is fully mixed with the sludge and nitrite in the mixing zone 130, it flows upward into the anaerobic ammonia oxidation zone 120. The ammonia nitrogen in the wastewater reacts with the nitrite to generate nitrogen gas. Then it enters the aerobic ammonia oxidation zone, where oxygen is supplied by an aerator. Nitrifying bacteria oxidize the remaining ammonia nitrogen in the wastewater into nitrite.

[0027] like Figure 2 As shown, in one embodiment, the water inlet assembly 300 includes a water inlet pipe 310 and a water distribution pipe 320. One end of the water inlet pipe 310 is connected to a sewage source, and the other end of the water inlet pipe 310 extends into the mixing zone 130 of the reaction tank 100 and is connected to the water distribution pipe 320. The top of the water distribution pipe 320 is provided with a plurality of water distribution holes 32a.

[0028] The water distribution pipe 320 includes multiple coaxially arranged annular pipes, all of which are connected to the inlet pipe 310. Each annular pipe has multiple water distribution holes 32a evenly arranged circumferentially at its top end. This ensures that the high-ammonia nitrogen wastewater enters the reaction tank 100 uniformly from bottom to top, preventing short-circuiting.

[0029] After the wastewater flows through the aerobic ammonia oxidation zone, it carries nitrite and sludge and is introduced into the three-phase separator 400. The treated water, air, nitrogen, nitrite and sludge are separated. The treated water, air and nitrogen are discharged from the top of the three-phase separator 400, while the nitrite and sludge are returned to the mixing zone 130 from the bottom of the three-phase separator 400.

[0030] In one embodiment, the three-phase separator 400 includes an outer cylinder 410, an inner cylinder 420, an outlet weir 430, and a return pipe 440. The outer cylinder 410 is fixedly connected to the reaction tank 100. The inner cylinder 420 is disposed inside the outer cylinder 410 and is fixedly connected to the reaction tank 100. The top of the inner cylinder 420 is higher than the top of the outer cylinder 410. A separation channel is formed between the inner cylinder 420 and the outer cylinder 410. The outlet weir 430 is fixedly connected to the inner wall above the inner cylinder 420. The top end of the return pipe 440 is connected to the bottom of the outer cylinder 410, and the bottom end of the return pipe 440 extends into the mixing zone 130.

[0031] The bottoms of both the outer cylinder 410 and the inner cylinder 420 are conical, and the separation channel includes a sinking channel extending vertically and a guide channel pointing to the top of the return pipe 440.

[0032] The packing layer 500 in this embodiment includes multiple vertically arranged rope-like packings. The top and bottom ends of the multiple rope-like packings are fixedly connected to the inner wall of the reaction tank 100 via connecting rods, which can effectively support anaerobic ammonia-oxidizing bacteria, prevent loss, and improve water treatment efficiency.

[0033] Of course, in other preferred embodiments, the packing layer 500 is also made of porous polyethylene or polyurethane material (specific surface area ≥800 m² / m³) to provide an attachment carrier for the growth and reproduction of anaerobic ammonia oxidizing bacteria and prevent sludge loss.

[0034] To improve the mixing efficiency between wastewater, sludge and nitrite, this embodiment also includes a stirrer 600, which is installed in the mixing zone 130 of the reaction tank 100 and located above the inlet water assembly 300, while preventing sludge from settling at the bottom of the tank.

[0035] In one embodiment, there are multiple stirrers 600, which are evenly arranged circumferentially along the mixing zone 130 and close to the inner wall of the reaction tank 100. The output end of each stirrer 600 is positioned towards the center of the mixing zone 130. The height of the stirrers 600 is greater than the bottom height of the reflux pipe 440.

[0036] Compared with existing technologies: the aeration component 200 has an upward-facing aeration end and is installed in the middle of the reaction tank 100. Therefore, the reaction tank 100 can be divided into an upper aerobic nitrification zone 110 and a lower anaerobic ammonia oxidation zone 120. Wastewater is introduced into the mixing zone 130 through the influent component 300. Wastewater, sludge, and nitrite are fully mixed in the mixing zone 130, and then enter the anaerobic ammonia oxidation zone 120. The ammonia nitrogen in the wastewater reacts with the nitrite to generate nitrogen gas, which then enters the aerobic zone. In the ammonia oxidation zone, oxygen is supplied by an aerator, and nitrifying bacteria oxidize the remaining ammonia nitrogen into nitrite, which eventually enters the three-phase separator 400. Nitrogen and excess air are discharged through the exhaust end, and the treated water is discharged from the effluent end. The sludge and nitrified liquid are returned to the mixing zone 130. In the above reactions, aerobic and anaerobic reactions are treated separately to avoid the inhibition and interference of molecular oxygen on anaerobic ammonia oxidizing bacteria. At the same time, the packing layer 500 can effectively support anaerobic ammonia oxidizing bacteria, prevent loss, and improve water treatment efficiency.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anaerobic ammonia oxidation treatment device for high ammonia nitrogen wastewater, characterized in that, include: Reaction tank; An aeration component having an aeration end and installed in the middle of the reaction tank, the reaction tank being above the aeration component to form an aerobic nitrification zone, the reaction tank being below the aeration component to form an anaerobic ammonia oxidation zone, and the bottom of the reaction tank being below the anaerobic ammonia oxidation zone to form a mixing zone. A water inlet assembly, the water inlet end of which is connected to the mixing zone; A three-phase separator is installed at the top of the aerobic nitrification zone. The top of the three-phase separator has an outlet and an exhaust end, and the bottom of the three-phase separator has a return end that is connected to the mixing zone. The packing layer is installed in the anaerobic ammonia oxidation zone and serves as a carrier for anaerobic ammonia oxidizing bacteria.

2. The high-ammonia-nitrogen wastewater treatment apparatus according to claim 1, wherein The aeration assembly includes an air source, an aeration pipe, and multiple aeration nozzles arranged in an array in a horizontal plane. The air inlet end of the aeration pipe is connected to the air source, and the air outlet end of the aeration pipe extends into the reaction tank and is connected to the multiple aeration nozzles.

3. The high-ammonia nitrogen wastewater process apparatus according to claim 1, wherein The water inlet assembly includes an inlet pipe and a distribution pipe. One end of the inlet pipe is connected to a sewage source, and the other end of the inlet pipe extends into the mixing zone of the reaction tank and is connected to the distribution pipe. The top of the distribution pipe has multiple distribution holes.

4. The high-ammonia wastewater ANAMMOX treatment apparatus according to claim 3, characterized by, The water distribution pipe includes multiple coaxially arranged annular pipes, all of which are connected to the water inlet pipe, and each of the annular pipes has multiple water distribution holes evenly arranged along its circumference at its top end.

5. The high-ammonia wastewater ANAMMOX treatment device according to claim 1, characterized in that, The three-phase separator includes an outer cylinder, an inner cylinder, an outlet weir, and a return pipe. The outer cylinder is fixedly connected to the reaction tank. The inner cylinder is disposed inside the outer cylinder and fixedly connected to the reaction tank. The top of the inner cylinder is higher than the top of the outer cylinder. A separation channel is formed between the inner cylinder and the outer cylinder. The outlet weir is fixedly connected to the inner wall above the inner cylinder. The top end of the return pipe is connected to the bottom of the outer cylinder, and the bottom end of the return pipe extends into the mixing zone.

6. The high-ammonia wastewater ANAMMOX treatment device according to claim 5, characterized in that, The bottoms of both the outer cylinder and the inner cylinder are conical, and the separation channel includes a sinking channel extending vertically and a guide channel pointing to the top of the return pipe.

7. The high-ammonia wastewater ANAMMOX treatment device according to claim 1, characterized by, The packing layer includes multiple vertically arranged rope-like packings, the top and bottom ends of which are fixedly connected to the inner wall of the reaction tank via connecting rods.

8. The high-ammonia wastewater ANAMMOX treatment device according to claim 5, characterized by, It also includes a stirrer, which is installed in the mixing zone of the reaction tank and located above the water inlet assembly.

9. The high-ammonia wastewater ANAMMOX treatment device according to claim 8, characterized in that, The number of stirrers is multiple, and the multiple stirrers are evenly arranged around the circumference of the mixing zone and close to the inner wall of the reaction tank. The output end of each stirrer is set towards the center of the mixing zone.

10. The high-ammonia wastewater ANAMMOX treatment device of claim 8, wherein, The height of the stirrer is greater than the height of the bottom of the return pipe.

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