An integrated device for deep denitrification of ammonia nitrogen-containing wastewater and a treatment method thereof

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to an integrated device for deep denitrification of ammonia-nitrogen-containing sewage and a treatment method thereof. The integrated device for deep denitrification of ammonia-nitrogen-containing sewage described in the present invention has each reaction section tightly combined in space, the tank body is built together, the head loss is small, and through the coordination of multi-stage and multi-biochemical processes, it overcomes the shortcomings of low denitrification efficiency, poor operation stability, large floor space, and many monomer structures when treating sewage with traditional biochemical technology; it has the functions of organic matter oxidation, denitrification, short-range nitrification, and short-range nitrification-anaerobic ammonia oxidation, and has the advantages of high denitrification efficiency, stable operation, high integration, and small floor space.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an integrated device for deep denitrification of ammonia nitrogen-containing sewage and a treatment method thereof. Background Art

[0002] The sludge volume load of traditional sewage biochemical treatment is limited, resulting in limited sewage treatment capacity, causing the device (equipment) to be inefficient in treating sewage containing ammonia nitrogen, unable to cope with large load shocks, and occupying a large area, which cannot meet the needs of efficient biochemical treatment of pollutants. At present, my country is strengthening its efforts to prevent and control water pollution, and efficient deep denitrification of sewage containing ammonia nitrogen is still one of the main problems that need to be faced at present. At present, there are many technologies and devices for the treatment of sewage containing ammonia nitrogen, and various technical methods are adopted. However, the existing technologies and devices have their own shortcomings. Chemical treatment cannot effectively denitrify sewage, and traditional biological treatment devices have low treatment efficiency, poor operating stability, low integration, and large floor space. Therefore, in response to the problems faced, it is urgent to develop integrated and efficient integrated treatment devices. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide an integrated device for deep denitrification of ammonia nitrogen-containing wastewater and a treatment method thereof. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater described in the present invention has each reaction section tightly combined in space, the tank body is built together, the head loss is small, and through the coordination of multi-stage and multi-biochemical processes, it overcomes the shortcomings of low denitrification efficiency, poor operation stability, large floor space, and many monomer structures when treating sewage with traditional biochemical technology; it has the functions of organic matter oxidation, denitrification, short-range nitrification, and short-range nitrification-anaerobic ammonia oxidation, and has the advantages of high denitrification efficiency, stable operation, high integration, and small floor space.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] The first object of the present invention is to provide an integrated device for deep denitrification of ammonia nitrogen-containing sewage, which is connected to an external ammonia nitrogen-containing sewage inlet pipe and a mud discharge pipe when in use. The device is a multi-layer ring structure, which comprises a denitrification section, a short-range nitrification section and a high-load oxidation section, a short-range nitrification-anaerobic ammonia oxidation section, and a precipitation section from the outside to the inside;

[0006] The denitrification section and the high-load oxidation section are connected to the external ammonia nitrogen-containing sewage inlet pipe; a stage partition is provided at the connection between the denitrification section and the short-range nitrification section, a first interstage solid-liquid separation section is provided at the connection between the short-range nitrification section and the high-load oxidation section, and a second interstage solid-liquid separation section is provided at the connection between the high-load oxidation section and the denitrification section; the short-range nitrification-anaerobic ammonia oxidation section is connected to the sedimentation section through the biochemical reaction zone outlet pipe, and the sedimentation section is connected to the external mud discharge pipe;

[0007] The short-range nitrification section is connected to the denitrification section via a sludge reflux component, the first interstage solid-liquid separation section is connected to the denitrification section via a first effluent reflux component, and the sedimentation section is connected to the denitrification section via a second effluent reflux component;

[0008] Among them, the volume ratio of the denitrification section, the short-range nitrification section, the short-range nitrification-anaerobic ammonium oxidation section and the high-load oxidation section is 1:2-4:1.5-5:0.5-1.5;

[0009] The denitrification section is used to utilize organic matter in external ammonia nitrogen-containing sewage to remove nitric nitrogen in the short-range nitrification section return sewage, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter with subsequent anaerobic ammonia oxidation and other biochemical processes, and enhancing operation stability;

[0010] The short-range nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0011] The first interstage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the short-range nitrification-anaerobic ammonium oxidation section;

[0012] The second interstage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the denitrification section and the short-range nitrification-anaerobic ammonium oxidation section;

[0013] The high-load oxidation section is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0014] The short-cut nitrification-anaerobic ammonium oxidation section is used to achieve deep denitrification of sewage;

[0015] The sedimentation section is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0016] In one embodiment of the present invention, the total height of the integrated device is 5 to 8 m;

[0017] The lower edge of the stage partition is higher than the bottom surface of the integrated device to allow the sewage (mud and water mixture) treated in the denitrification section to pass through and enter the short-range nitrification section.

[0018] In one embodiment of the present invention, when the concentrations of nitrate nitrogen and COD in the influent of the device are high, the volume proportions of the denitrification section and the high-load oxidation section are appropriately increased; when the concentration of ammonia nitrogen is high, the volume proportions of the short-range nitrification section and the short-range nitrification-anaerobic ammonia oxidation section are appropriately increased.

[0019] In one embodiment of the present invention, the sludge return assembly includes a sludge return pump and a sludge return pipe, the short-range nitrification section is connected to the sludge return pump, and the sludge return pump is connected to the denitrification section through the sludge return pipe;

[0020] The first outlet water return assembly includes a first outlet water return pipe and a first outlet water return pump, the first overflow water distribution channel is connected to the first outlet water return pump through the first outlet water return pipe, and the first outlet water return pump is connected to the denitrification section through the first outlet water return pipe;

[0021] The second outlet water return component includes a second outlet water return pipe and a second outlet water return pump, the outlet tank is connected to the second outlet water return pump through the second outlet water return pipe, and the second outlet water return pump is connected to the denitrification section through the second outlet water return pipe.

[0022] In one embodiment of the present invention, a stirring device is provided in the denitrification section;

[0023] The short-range nitrification section is provided with a stirring device and a first aeration pipe system;

[0024] A third aeration pipe system is arranged inside the high-load oxidation section;

[0025] A first overflow water distribution channel is arranged around the top of the first interstage solid-liquid separation section, a first mud slide is arranged between the first interstage solid-liquid separation section and the short-range nitrification section, and the first mud slide is connected to the high-load oxidation section through a first partition partition;

[0026] A second overflow water distribution channel is arranged around the top of the second interstage solid-liquid separation section, a second mud slide is arranged between the second interstage solid-liquid separation section and the high-load oxidation section, and is connected to the denitrification section through a second partition plate.

[0027] In one embodiment of the present invention, the bottom end of the first mud slide is higher than the bottom surface of the first interstage solid-liquid separation section, and the top end is higher than the lower bottom surface of the first overflow water distribution channel;

[0028] The bottom end of the second mud slide is higher than the bottom surface of the second inter-stage solid-liquid separation section, and the top end is higher than the lower bottom surface of the second overflow water distribution channel;

[0029] The bottom end of the first partition plate is connected to the bottom surface of the first inter-stage solid-liquid separation section, and the top end is higher than the bottom surface of the first overflow water distribution channel;

[0030] The bottom end of the second partition plate is connected to the bottom surface of the second interstage solid-liquid separation section, and the top end is higher than the lower bottom surface of the second overflow water distribution channel;

[0031] The angle between the first mud slide and the bottom end of the first partition partition is 40-120°;

[0032] The included angle between the second mud slide and the bottom end of the second partition partition is 40-120 degrees.

[0033] In one embodiment of the present invention, the short-range nitrification-anaerobic ammonium oxidation section is provided with a semicircular gallery partition, a biological carrier, a second aeration pipe system and a submersible flow propeller, and is connected to the sedimentation section through a biochemical reaction zone outlet pipe.

[0034] In one embodiment of the present invention, the gallery partition is semicircular, including a first gallery partition and a second gallery partition that are opposite and concentrically arranged with inner arcs, the radius of the first gallery partition is 70% to 85% of the radius of the short-range nitrification-anaerobic ammonium oxidation section, and the radius of the second gallery partition is 45% to 60% of the radius of the short-range nitrification-anaerobic ammonium oxidation section;

[0035] The biological carrier is selected from one of biological ropes, hollow suspended fillers or polyurethane foams; the delivery form of the biological carrier is selected from one of fluidized or fixed forms, and the filling rate is 40% to 60%.

[0036] In one embodiment of the present invention, water outlet channels are arranged around the top of the sedimentation section, and a flow stabilizing cylinder, a concentrator and a mud collecting bucket are arranged inside. The flow stabilizing cylinder is arranged at the middle position in the height direction of the sedimentation section and is connected to the water outlet pipe of the biochemical reaction zone. The top of the concentrator passes through the flow stabilizing cylinder and extends out of the top of the sedimentation section to be connected to an external mixer. The mud collecting bucket is arranged at the bottom of the sedimentation section and is connected to an external mud discharge pipe.

[0037] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0038] The concentrator comprises a scraper and a rotating shaft, wherein the rotating shaft is connected to the scraper, and the top of the rotating shaft passes through a flow stabilizing tube and extends out of the top of a sedimentation section to be connected to an external agitator.

[0039] In one embodiment of the present invention, a water outlet trough is provided below the side of the water outlet channel away from the mud collecting bucket, the water outlet channel is 300-900 mm away from the top of the integrated device, and the water outlet trough is 200-500 mm lower than the water outlet channel.

[0040] The second object of the present invention is to provide a method for deep denitrification of ammonia-nitrogen-containing wastewater, based on the above-mentioned integrated device for deep denitrification of ammonia-nitrogen-containing wastewater, specifically comprising the following steps:

[0041] (S1) a portion of the wastewater containing ammonia nitrogen enters the denitrification section, and after treatment, denitrification section treated wastewater is obtained;

[0042] (S2) the treated sewage in the denitrification section enters the short-cut nitrification section through the stage partition plate, and the short-cut nitrification section treated sewage is obtained after treatment, and part of the sludge in the short-cut nitrification section is returned to the denitrification section;

[0043] (S3) a portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section through the first interstage solid-liquid separation section, and another portion of the wastewater treated in the short-cut nitrification section flows back to the denitrification section through the first interstage solid-liquid separation section and the first effluent return component;

[0044] (S4) another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section, and after treatment, the high-load oxidation section treated wastewater is obtained;

[0045] (S5) The wastewater treated in the high-load oxidation section enters the short-cut nitrification-anaerobic ammonium oxidation section through the second interstage solid-liquid separation section;

[0046] (S6) the short-cut nitrification-anaerobic ammonium oxidation section treats the high-load oxidation section treated wastewater and the short-cut nitrification section treated wastewater to obtain the short-cut nitrification-anaerobic ammonium oxidation section treated wastewater;

[0047] (S7) The short-range nitrification-anaerobic ammonium oxidation section treats the wastewater and enters the sedimentation section to obtain sludge and effluent from the integrated device. The sludge is directly discharged, and part of the effluent from the integrated device is refluxed to the denitrification section through the second effluent return component, and the other part is directly discharged.

[0048] In one embodiment of the present invention, the surface load of the first interstage solid-liquid separation section is 0.6 to 2.0 m 3 / m 2 / h;

[0049] The surface load of the second interstage solid-liquid separation section is 0.3 to 1.0 m 3 / m 2 / h;

[0050] The surface load of the sedimentation section is 1.5 to 2.0 m 3 / m 2 / h;

[0051] The dissolved oxygen concentration in the short-range nitrification section is 0.5-0.8 mg / L;

[0052] The dissolved oxygen concentration in the high-load oxidation section is 1.0 to 2.0 mg / L;

[0053] The dissolved oxygen concentration in the short-range nitrification-anaerobic ammonium oxidation section is 0.1-0.3 mg / L.

[0054] In one embodiment of the present invention, the stirring speed setting range of the stirring device is 50-500 r / min; the volume load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 1.0-5.0 kgBOD5 / m 3 / d; the flow velocity of the submersible flow propeller is 0.2-0.5m / s.

[0055] In one embodiment of the present invention, the return volume of sewage treated in the short-cut nitrification stage accounts for 30% to 70% of the sewage treated in the short-cut nitrification stage; the return volume of effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] (1) The integrated device for deep denitrification of ammonia-nitrogen-containing wastewater of the present invention adopts the multi-biochemical process coupling technology of organic matter oxidation-denitrification-short-range nitrification-anaerobic ammonia oxidation, which has high volumetric load, high denitrification efficiency, and strong resistance to ammonia nitrogen shock load.

[0058] (2) The integrated device for deep denitrification of ammonia nitrogen-containing wastewater of the present invention has a denitrification section for enhancing the removal of nitrate nitrogen and organic matter. On the one hand, it enhances the removal of nitrate nitrogen and improves the total nitrogen removal rate; on the other hand, it reduces the interference of organic matter on subsequent biochemical processes such as anaerobic ammonia oxidation and enhances operational stability.

[0059] (3) The integrated device for deep denitrification of ammonia nitrogen-containing wastewater of the present invention has a high-load oxidation section for treating part of the raw water, removing organic matter in the wastewater, and providing ammonia nitrogen-containing wastewater that is basically free of organic matter to supplement the demand for ammonia nitrogen in subsequent processes, while avoiding interference from organic matter.

[0060] (4) The integrated device for deep denitrification of ammonia-nitrogen-containing wastewater of the present invention adopts a short-range nitrification stage in series with a short-range nitrification-anaerobic ammonium oxidation process, that is, a one-stage anaerobic ammonium oxidation process coupled with a two-stage anaerobic ammonium oxidation process, and provides sufficient and appropriately proportioned reaction substrates for the anaerobic ammonium oxidation process in the device through multi-stage water adjustment and dissolved oxygen control, thereby obtaining stable and efficient denitrification performance.

[0061] (5) The integrated device for deep denitrification of ammonia nitrogen-containing wastewater of the present invention occupies a small area, has a high degree of integration, has a regular equipment appearance, and has a high space utilization rate. Most of the motors involved in the reaction are located outside the device, which is convenient for maintenance. The device integrates biochemical and secondary sedimentation in one, and realizes the close combination of each reaction pool in a three-dimensional space. The sewage treatment capacity per unit volume is significantly improved compared with the traditional process. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A top view of a cross-sectional view of an integrated device for deep denitrification of ammonia nitrogen-containing wastewater provided by the present invention;

[0063] Figure 2 A process development diagram of an integrated device for deep denitrification of ammonia nitrogen-containing wastewater provided by the present invention;

[0064] Numbers in the figure: 10. denitrification section; 20. short-range nitrification section; 30. short-range nitrification-anaerobic ammonium oxidation section; 40. first interstage solid-liquid separation section; 50. second interstage solid-liquid separation section; 60. sedimentation section; 70. stirring device; 80. first effluent return assembly; 90. second effluent return assembly; 100. high-load oxidation section; 11. interstage partition; 21. first aeration pipe system; 22. sludge return pump; 31. gallery partition; 32. submersible flow propeller; 33. second aeration pipe system; 3 4. Biological carrier; 35. Biochemical reaction zone outlet pipe; 41. First overflow water distribution channel; 42. First mud slide; 43. First partition baffle; 51. Second overflow water distribution channel; 52. Second mud slide; 53. Second partition baffle; 61. Mud collecting bucket; 62. Water outlet channel; 63. Water outlet trough; 64. Mud discharge pipe; 65. Flow stabilizing cylinder; 66. Water distribution port; 67. Cylinder bottom plate; 68. Concentrator; 81. First water outlet return pump; 91. Second water outlet return pump; 101. Third aeration pipe system. DETAILED DESCRIPTION

[0065] The present invention provides an integrated device for deep denitrification of ammonia nitrogen-containing sewage, which is connected to an external ammonia nitrogen-containing sewage inlet pipe and a mud discharge pipe when in use. The device is a multi-layer ring structure, which comprises a denitrification section, a short-range nitrification section and a high-load oxidation section, a short-range nitrification-anaerobic ammonia oxidation section, and a precipitation section from the outside to the inside.

[0066] The denitrification section and the high-load oxidation section are connected to the external ammonia nitrogen-containing sewage inlet pipe; a stage partition is provided at the connection between the denitrification section and the short-range nitrification section, a first interstage solid-liquid separation section is provided at the connection between the short-range nitrification section and the high-load oxidation section, and a second interstage solid-liquid separation section is provided at the connection between the high-load oxidation section and the denitrification section; the short-range nitrification-anaerobic ammonia oxidation section is connected to the sedimentation section through the biochemical reaction zone outlet pipe, and the sedimentation section is connected to the external mud discharge pipe;

[0067] The short-range nitrification section is connected to the denitrification section via a sludge reflux component, the first interstage solid-liquid separation section is connected to the denitrification section via a first effluent reflux component, and the sedimentation section is connected to the denitrification section via a second effluent reflux component;

[0068] Among them, the volume ratio of the denitrification section, the short-range nitrification section, the short-range nitrification-anaerobic ammonium oxidation section and the high-load oxidation section is 1:2-4:1.5-5:0.5-1.5;

[0069] The denitrification section is used to utilize organic matter in external ammonia nitrogen-containing sewage to remove nitric nitrogen in the short-range nitrification section return sewage, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter with subsequent anaerobic ammonia oxidation and other biochemical processes, and enhancing operation stability;

[0070] The short-range nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0071] The first interstage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the short-range nitrification-anaerobic ammonium oxidation section;

[0072] The second interstage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the denitrification section and the short-range nitrification-anaerobic ammonium oxidation section;

[0073] The high-load oxidation section is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0074] The short-cut nitrification-anaerobic ammonium oxidation section is used to achieve deep denitrification of sewage;

[0075] The sedimentation section is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0076] In one embodiment of the present invention, the total height of the integrated device is 5 to 8 m;

[0077] The lower edge of the stage partition plate is higher than the bottom surface of the integrated device and is provided with a plurality of flow holes that allow the sewage containing ammonia nitrogen (mud and water mixture) treated in the denitrification section to flow through and enter the short-range nitrification section.

[0078] In one embodiment of the present invention, when the concentrations of nitrate nitrogen and COD in the influent of the device are high, the volume proportions of the denitrification section and the high-load oxidation section are appropriately increased; when the concentration of ammonia nitrogen is high, the volume proportions of the short-range nitrification section and the short-range nitrification-anaerobic ammonia oxidation section are appropriately increased.

[0079] In one embodiment of the present invention, the sludge return assembly includes a sludge return pump and a sludge return pipe, the short-range nitrification section is connected to the sludge return pump, and the sludge return pump is connected to the denitrification section through the sludge return pipe;

[0080] The first outlet water return assembly includes a first outlet water return pipe and a first outlet water return pump, the first overflow water distribution channel is connected to the first outlet water return pump through the first outlet water return pipe, and the first outlet water return pump is connected to the denitrification section through the first outlet water return pipe;

[0081] The second outlet water return component includes a second outlet water return pipe and a second outlet water return pump, the outlet tank is connected to the second outlet water return pump through the second outlet water return pipe, and the second outlet water return pump is connected to the denitrification section through the second outlet water return pipe.

[0082] In one embodiment of the present invention, a stirring device is provided in the denitrification section;

[0083] The short-range nitrification section is provided with a stirring device and a first aeration pipe system;

[0084] A third aeration pipe system is arranged inside the high-load oxidation section;

[0085] A first overflow water distribution channel is arranged around the top of the first interstage solid-liquid separation section, a first mud slide is arranged between the first interstage solid-liquid separation section and the short-range nitrification section, and the first mud slide is connected to the high-load oxidation section through a first partition partition;

[0086] A second overflow water distribution channel is arranged around the top of the second interstage solid-liquid separation section, a second mud slide is arranged between the second interstage solid-liquid separation section and the high-load oxidation section, and is connected to the denitrification section through a second partition plate.

[0087] In one embodiment of the present invention, the bottom end of the first mud slide is higher than the bottom surface of the first interstage solid-liquid separation section, and the top end is higher than the lower bottom surface of the first overflow water distribution channel;

[0088] The bottom end of the second mud slide is higher than the bottom surface of the second inter-stage solid-liquid separation section, and the top end is higher than the lower bottom surface of the second overflow water distribution channel;

[0089] The bottom end of the first partition plate is connected to the bottom surface of the first inter-stage solid-liquid separation section, and the top end is higher than the bottom surface of the first overflow water distribution channel;

[0090] The bottom end of the second partition plate is connected to the bottom surface of the second interstage solid-liquid separation section, and the top end is higher than the lower bottom surface of the second overflow water distribution channel;

[0091] The angle between the first mud slide and the bottom end of the first partition partition is 40-120°;

[0092] The included angle between the second mud slide and the bottom end of the second partition partition is 40-120 degrees.

[0093] In one embodiment of the present invention, the short-range nitrification-anaerobic ammonium oxidation section is provided with a semicircular gallery partition, a biological carrier, a second aeration pipe system and a submersible flow propeller, and is connected to the sedimentation section through a biochemical reaction zone outlet pipe.

[0094] In one embodiment of the present invention, the gallery partition is semicircular, including a first gallery partition and a second gallery partition that are opposite and concentrically arranged with inner arcs, the radius of the first gallery partition is 70% to 85% of the radius of the short-range nitrification-anaerobic ammonium oxidation section, and the radius of the second gallery partition is 45% to 60% of the radius of the short-range nitrification-anaerobic ammonium oxidation section;

[0095] The biological carrier is selected from one of biological ropes, hollow suspended fillers or polyurethane foams; the delivery form of the biological carrier is selected from one of fluidized or fixed forms, and the filling rate is 40% to 60%.

[0096] In one embodiment of the present invention, water outlet channels are arranged around the top of the sedimentation section, and a flow stabilizing cylinder, a concentrator and a mud collecting bucket are arranged inside. The flow stabilizing cylinder is arranged at the middle position in the height direction of the sedimentation section and is connected to the water outlet pipe of the biochemical reaction zone. The top of the concentrator passes through the flow stabilizing cylinder and extends out of the top of the sedimentation section to be connected to an external mixer. The mud collecting bucket is arranged at the bottom of the sedimentation section and is connected to an external mud discharge pipe.

[0097] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0098] The concentrator comprises a scraper and a rotating shaft, wherein the rotating shaft is connected to the scraper, and the top of the rotating shaft passes through a flow stabilizing tube and extends out of the top of a sedimentation section to be connected to an external agitator.

[0099] In one embodiment of the present invention, a water outlet trough is provided below the side of the water outlet channel away from the mud collecting bucket, the water outlet channel is 300-900 mm away from the top of the integrated device, and the water outlet trough is 200-500 mm lower than the water outlet channel.

[0100] The present invention provides a treatment method for deep denitrification of ammonia-nitrogen-containing wastewater, based on the above-mentioned integrated device for deep denitrification of ammonia-nitrogen-containing wastewater, specifically comprising the following steps:

[0101] (S1) a portion of the wastewater containing ammonia nitrogen enters the denitrification section, and after treatment, denitrification section treated wastewater is obtained;

[0102] (S2) the treated sewage in the denitrification section enters the short-cut nitrification section through the stage partition plate, and the short-cut nitrification section treated sewage is obtained after treatment, and part of the sludge in the short-cut nitrification section is returned to the denitrification section;

[0103] (S3) a portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification anaerobic ammonia oxidation section through the first interstage solid-liquid separation section, and another portion of the wastewater treated in the short-cut nitrification section flows back to the denitrification section through the first interstage solid-liquid separation section and the first effluent return component;

[0104] (S4) another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section, and after treatment, the high-load oxidation section treated wastewater is obtained;

[0105] (S5) The wastewater treated in the high-load oxidation section enters the short-cut nitrification-anaerobic ammonium oxidation section through the second interstage solid-liquid separation section;

[0106] (S6) the short-cut nitrification-anaerobic ammonium oxidation section treats the high-load oxidation section treated wastewater and the short-cut nitrification section treated wastewater to obtain the short-cut nitrification-anaerobic ammonium oxidation section treated wastewater;

[0107] (S7) The short-range nitrification-anaerobic ammonium oxidation section treats the wastewater and enters the sedimentation section to obtain sludge and effluent from the integrated device. The sludge is directly discharged, and part of the effluent from the integrated device is refluxed to the denitrification section through the second effluent return component, and the other part is directly discharged.

[0108] In one embodiment of the present invention, the surface load of the first interstage solid-liquid separation section is 0.6 to 2.0 m 3 / m 2 / h;

[0109] The surface load of the second interstage solid-liquid separation section is 0.3 to 1.0 m 3 / m 2 / h;

[0110] The surface load of the sedimentation section is 1.5 to 2.0 m 3 / m 2 / h;

[0111] The dissolved oxygen concentration in the short-range nitrification section is 0.5-0.8 mg / L;

[0112] The dissolved oxygen concentration in the high-load oxidation section is 1.0 to 2.0 mg / L;

[0113] The dissolved oxygen concentration in the short-range nitrification-anaerobic ammonium oxidation section is 0.1-0.3 mg / L.

[0114] In one embodiment of the present invention, the stirring speed setting range of the stirring device is 50-500 r / min; the volume load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 1.0-5.0 kgBOD5 / m 3 / d; the flow velocity of the submersible flow propeller is 0.2-0.5m / s.

[0115] In one embodiment of the present invention, the return volume of wastewater treated in the high-load oxidation stage accounts for 30% to 70% of the wastewater treated in the high-load oxidation stage; the return volume of effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

[0116] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0117] The integrated device model, size (diameter), specifications of related equipment and other parameters in the following embodiments are only a specific description; in actual application, they can be adjusted according to the water quality and water volume of high ammonia nitrogen wastewater to be treated.

[0118] In the following examples, unless otherwise specified, all materials used are commercially available materials, and all means and methods used are conventional means and methods in the art.

[0119] Example 1

[0120] This embodiment provides an integrated device for deep denitrification of wastewater containing ammonia nitrogen.

[0121] like Figure 1 and Figure 2 As shown, an integrated device for deep denitrification of ammonia-nitrogen-containing wastewater is a multi-layered annular structure, including a central cylindrical sedimentation section 60, a short-range nitrification-anaerobic ammonium oxidation section 30 surrounding the sedimentation section 60, a denitrification section 10 surrounding the short-range nitrification-anaerobic ammonium oxidation section 30, a short-range nitrification section 20 and a high-load oxidation section 100;

[0122] The total height of the integrated device is 6m, and the volume ratio of the denitrification section 10, the short-cut nitrification section 20, the short-cut nitrification-anaerobic ammonium oxidation section 30 and the high-load oxidation section 100 is 1:4:2:1;

[0123] The denitrification section 10 is provided with a stirring device 70, and is connected to the short-distance nitrification section 20 through the stage partition 11; the lower edge of the stage partition 11 is higher than the bottom surface of the integrated device, and a plurality of flow holes are provided to allow the sewage treated in the denitrification section to flow through the sewage containing ammonia nitrogen (mud and water mixture) and enter the short-distance nitrification section 20; the short-distance nitrification section 20 is provided with a stirring device 70 and a first aeration pipe system 21, and is connected to the denitrification section 10 through a sludge return assembly, wherein the sludge return assembly includes a sludge return pipe and a sludge return pump 22, the short-distance nitrification section 20 is connected to the sludge return pump 22, and the sludge return pump 22 is connected to the denitrification section 10 through the sludge return pipe. The high-load oxidation section 100 is provided with a third aeration pipe system 101, a first interstage solid-liquid separation section 40 is provided between the short-distance nitrification section 20 and the high-load oxidation section 100, a first overflow water distribution channel 41 is provided around the top of the first interstage solid-liquid separation section 40, a first mud slide 42 is provided between the first interstage solid-liquid separation section 40 and the short-distance nitrification section 20, and is connected to the high-load oxidation section 100 through a first partition partition 43, the bottom end of the first mud slide 42 is higher than the bottom surface of the first interstage solid-liquid separation section 40, the top end is higher than the lower bottom surface of the first overflow water distribution channel 41, and the bottom end of the first partition partition 43 is connected to the bottom surface of the first interstage solid-liquid separation section 40 The top of the first mud slide 42 is higher than the lower bottom surface of the first overflow water distribution channel 41, and the angle between the first mud slide 42 and the bottom end of the first partition baffle 43 is 80°; a second interstage solid-liquid separation section 50 is arranged between the high-load oxidation section 100 and the denitrification section 10, and a second overflow water distribution channel 51 is arranged around the top of the second interstage solid-liquid separation section 50. A second mud slide 52 is arranged between the second interstage solid-liquid separation section 50 and the high-load oxidation section 100, and is connected to the denitrification section 10 through the second partition baffle 53; the bottom end of the second mud slide 52 is higher than the bottom surface of the second interstage solid-liquid separation section 50, and the top end is higher than the lower bottom surface of the second overflow water distribution channel 51; the bottom of the second partition baffle 53 is higher than the bottom surface of the second interstage solid-liquid separation section 50. The end is connected to the bottom surface of the second interstage solid-liquid separation section 50, and the top end is higher than the lower bottom surface of the second overflow water distribution channel 51; the lower bottom surface of the second overflow water distribution channel 51 is lower than the lower bottom surface of the first overflow water distribution channel 41; the second mud slide 52 and the bottom end of the second partition partition 53 are at an angle of 80°; the first overflow water distribution channel 41 is also connected to the denitrification section 10 through the first outlet water return component 80, the first outlet water return component 80 includes a first outlet water return pipe and a first outlet water return pump 81, the first overflow water distribution channel 41 is connected to the first outlet water return pump 81 through the first outlet water return pipe, and the first outlet water return pump 81 is connected to the denitrification section 10 through the first outlet water return pipe.

[0124] A semicircular gallery partition 31, a biological carrier 34, a second aeration pipe system 33 and a submersible flow propeller 32 are arranged inside the short-range nitrification-anaerobic ammonium oxidation section 30, and is connected to the sedimentation section 60 through a water outlet pipe 35 of a biochemical reaction zone; the gallery partition 31 is semicircular, including a first gallery partition and a second gallery partition arranged concentrically with opposite inner arcs, the radius of the first gallery partition is 70% of the radius of the short-range nitrification-anaerobic ammonium oxidation section 30, and the radius of the second gallery partition is 50% of the radius of the short-range nitrification-anaerobic ammonium oxidation section 30; the biological carrier 34 is a biological rope, the deployment form is fixed, and the filling rate is 40%; the short-range nitrification-anaerobic ammonium oxidation section 30 is connected to the sedimentation section 60 through a water outlet pipe 35 of a biochemical reaction zone.

[0125] A water outlet channel 62 is arranged around the top of the sedimentation section 60. A water outlet trough 63 is arranged below the side of the water outlet channel 62 away from the mud collecting bucket 61. The distance between the water outlet channel 62 and the top of the integrated device is 900 mm, and the water outlet trough 63 is 300 mm lower than the water outlet channel 62. A flow stabilizing cylinder 65, a concentrator 68 and a mud collecting bucket 61 are arranged inside the sedimentation section 60. The flow stabilizing cylinder 65 is arranged at the middle position in the height direction of the sedimentation section 60 and is connected to the water outlet pipe 35 of the biochemical reaction zone. The bottom plate of the flow stabilizing cylinder 65 is a cylinder bottom plate 67, and a water distribution port 66 is arranged on the cylinder bottom plate 67. The concentrator 68 includes a scraper and a rotating shaft. The rotating shaft is connected to the scraper. The top of the rotating shaft passes through the flow stabilizing cylinder 65 and extends out of the top of the sedimentation section 60 to be connected to the external mixer. The mud collecting bucket 61 is connected to the mud collecting bucket 61. 1 is arranged at the bottom of the sedimentation section 60 and connected to the external mud discharge pipe 64; the outlet trough 63 is connected to the denitrification section 10 through the second outlet return component 90 to remove the nitrate nitrogen produced in the anaerobic ammonia oxidation process and enhance the total nitrogen removal rate; the second outlet return component 90 includes a second outlet return pipe and a second outlet return pump 91, the outlet trough 63 is connected to the second outlet return pump 91 through the second outlet return pipe, and the second outlet return pump 91 is connected to the denitrification section 10 through the second outlet return pipe.

[0126] The denitrification section 10 is used to utilize organic matter in the external ammonia nitrogen-containing sewage to remove nitric nitrogen in the return sewage of the short-range nitrification section 20, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter with subsequent anaerobic ammonia oxidation and other biochemical processes, and enhancing operation stability;

[0127] The short-range nitrification section 20 is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0128] The first inter-stage solid-liquid separation section 40 is used to achieve solid-liquid separation of sewage and divert the sewage to the short-range nitrification-anaerobic ammonium oxidation section 30;

[0129] The second interstage solid-liquid separation section 50 is used to achieve solid-liquid separation of the sewage and divert the sewage to the denitrification section 10 and the short-range nitrification-anaerobic ammonium oxidation section 30;

[0130] The high-load oxidation section 100 is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0131] The short-cut nitrification-anaerobic ammonium oxidation section 30 is used to achieve deep denitrification of sewage;

[0132] The sedimentation section 60 is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0133] Example 2

[0134] This embodiment provides a treatment method for deep denitrification of high ammonia nitrogen wastewater, based on the integrated device of Example 1, specifically comprising the following steps:

[0135] (S1) A portion of the wastewater containing ammonia nitrogen enters the denitrification section 10, where nitric nitrogen is removed and organic matter in the high-ammonia nitrogen wastewater is consumed (on the one hand, the removal of nitric nitrogen is enhanced, and on the other hand, the interference of organic matter with subsequent biochemical processes such as anaerobic ammonium oxidation is reduced, thereby enhancing operation stability), and wastewater treated in the denitrification section is obtained;

[0136] Wherein, the rotation speed of the stirring device 70 in the denitrification section 10 is 200r / min;

[0137] (S2) The denitrification section treated sewage enters the short-cut nitrification section 20 through the stage partition 11, and converts part of the ammonia nitrogen into nitrite nitrogen to obtain the short-cut nitrification section treated sewage, and part of the sludge in the short-cut nitrification section 20 flows back to the denitrification section 10;

[0138] The speed of the stirring device 70 in the short-range nitrification section 20 is 200 r / min, and the dissolved oxygen concentration is 0.5-0.8 mg / L;

[0139] (S3) a portion of the short-cut nitrification section treated wastewater enters the short-cut nitrification anaerobic ammonia oxidation section 30 through the first interstage solid-liquid separation section 40, and another portion of the short-cut nitrification section treated wastewater flows back to the denitrification section 10 through the first interstage solid-liquid separation section 40;

[0140] The surface load of the first interstage solid-liquid separation section 40 is 2.0 m 3 / m 2 / h; the return flow of sewage treated in the short-cut nitrification section is 40% of the sewage treated in the short-cut nitrification section;

[0141] (S4) another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section 100, and the organic matter in the wastewater containing ammonia nitrogen is removed to obtain the wastewater treated by the high-load oxidation section;

[0142] Wherein, the dissolved oxygen concentration of the high-load oxidation section 100 is 1.5 mg / L;

[0143] (S5) The wastewater treated in the high-load oxidation stage enters the short-range nitrification-anaerobic ammonia oxidation stage 30 through the second interstage solid-liquid separation stage 50 to replenish ammonia nitrogen and adjust the ammonia nitrogen / nitrite nitrogen ratio;

[0144] The surface load of the second interstage solid-liquid separation section 50 is 0.5 m 3 / m 2 / h, the flow velocity of the submersible flow propeller 32 in the short-range nitrification-anaerobic ammonium oxidation section 50 is 0.2m / s; the dissolved oxygen concentration in the short-range nitrification section 20 is 0.5-0.8mg / L,

[0145] (S6) the short-cut nitrification-anaerobic ammonium oxidation section 30 treats the high-load oxidation section treated wastewater and the short-cut nitrification section treated wastewater to achieve simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining short-cut nitrification-anaerobic ammonium oxidation section treated wastewater;

[0146] Among them, the dissolved oxygen concentration of the short-range nitrification-anaerobic ammonium oxidation section 30 is 0.1-0.3 mg / L;

[0147] (S7) The short-cut nitrification-anaerobic ammonium oxidation stage treats the wastewater and enters the sedimentation stage 60 to obtain sludge and effluent from the integrated device. The sludge is directly discharged, and part of the effluent from the integrated device is returned to the denitrification stage 10 (using organic matter in the ammonia nitrogen-containing wastewater to remove nitrate nitrogen byproducts produced by anaerobic ammonium oxidation, thereby enhancing the total nitrogen removal rate of the integrated device), and the other part is directly discharged;

[0148] The surface load of the sedimentation section 60 is 1.5 m 3 / m 2 / h; the return flow of the integrated device effluent is 50% of the integrated device effluent; the volume load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 3.0kg BOD5 / m 3 / d.

[0149] Example 3

[0150] Compared with Example 1, in this embodiment, the volume ratio of the denitrification section 10, the short-cut nitrification section 20, the short-cut nitrification-anaerobic ammonium oxidation section 30 and the high-load oxidation section 100 is 1:4:3:1.5, and the surface loads of the first interstage solid-liquid separation section 40 and the second interstage solid-liquid separation section 50 are 2.0m 3 / m 2 / h and 1.0m 3 / m 2 / h, the volumetric load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 4.0kg BOD5 / m 3 / d, the installation angle between the first mud slide 42 and the first partition baffle 43, the installation angle between the second mud slide 52 and the second partition baffle 53 is 70°, the flow velocity of the submersible flow propeller 32 is 0.4m / s, the biological carrier 34 is a hollow suspended filler with a filling rate of 50%, and the carrier delivery form is fluidized. ", everything else is the same as Example 1.

[0151] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the explanation of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An integrated device for deep denitrification of ammonia nitrogen-containing wastewater, which is connected to an external ammonia nitrogen-containing wastewater inlet pipe and a mud discharge pipe (64) when in use, and is characterized in that: The device is a multi-layered annular structure, which comprises, from the outside to the inside, a denitrification section (10), a short-range nitrification section (20), a high-load oxidation section (100), a short-range nitrification-anaerobic ammonium oxidation section (30), and a precipitation section (60); The denitrification section (10) and the high-load oxidation section (100) are connected to an external ammonia nitrogen-containing sewage inlet pipe; a stage partition plate (11) is provided at the connection between the denitrification section (10) and the short-range nitrification section (20); a first interstage solid-liquid separation section (40) is provided at the connection between the short-range nitrification section (20) and the high-load oxidation section (100); a second interstage solid-liquid separation section (50) is provided at the connection between the high-load oxidation section (100) and the denitrification section (10); the short-range nitrification-anaerobic ammonia oxidation section (30) is connected to the sedimentation section (60) through the biochemical reaction zone outlet pipe (35), and the sedimentation section (60) is connected to an external mud discharge pipe (64); The short-range nitrification section (20) is connected to the denitrification section (10) via a sludge return assembly, the first interstage solid-liquid separation section (40) is connected to the denitrification section (10) via a first effluent return assembly (80), and the sedimentation section (60) is connected to the denitrification section (10) via a second effluent return assembly (90); The volume ratio of the denitrification section (10), the short-range nitrification section (20), the short-range nitrification-anaerobic ammonium oxidation section (30) and the high-load oxidation section (100) is 1:2-4:1.5-5:0.5-1.5; During the treatment process of the integrated device, a portion of the wastewater containing ammonia nitrogen enters the denitrification section (10), and after treatment, denitrification section treated wastewater is obtained; The denitrification section treated sewage enters the short-cut nitrification section (20) through the stage partition plate (11), and after treatment, the short-cut nitrification section treated sewage is obtained, and part of the sludge in the short-cut nitrification section (20) is returned to the denitrification section (10); A portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the first interstage solid-liquid separation section (40), and another portion of the wastewater treated in the short-cut nitrification section flows back to the denitrification section (10) through the first interstage solid-liquid separation section (40) and the first effluent return assembly (80); Another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section (100) and is treated to obtain high-load oxidation section treated wastewater; The wastewater treated in the high-load oxidation section enters the short-range nitrification-anaerobic ammonium oxidation section (30) through the second interstage solid-liquid separation section (50).

2. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 1, characterized in that: The denitrification section (10) is provided with a stirring device (70); The short-range nitrification section (20) is provided with a stirring device (70) and a first aeration pipe system (21); A third aeration pipe system (101) is arranged inside the high-load oxidation section (100); A first overflow water distribution channel (41) is arranged around the top of the first interstage solid-liquid separation section (40); a first mud slide (42) is arranged between the first interstage solid-liquid separation section (40) and the short-range nitrification section (20), and is connected to the high-load oxidation section (100) via a first partition plate (43); A second overflow water distribution channel (51) is arranged around the top of the second interstage solid-liquid separation section (50), and a second mud slide (52) is arranged between the second interstage solid-liquid separation section (50) and the high-load oxidation section (100), and is connected to the denitrification section (10) via a second partition plate (53).

3. An integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 2, characterized in that: The bottom end of the first mud slide (42) is higher than the bottom surface of the first inter-stage solid-liquid separation section (40), and the top end is higher than the bottom surface of the first overflow water distribution channel (41); The bottom end of the second mud slide (52) is higher than the bottom surface of the second inter-stage solid-liquid separation section (50), and the top end is higher than the bottom surface of the second overflow water distribution channel (51); The bottom end of the first partitioning baffle (43) is connected to the bottom surface of the first inter-stage solid-liquid separation section (40), and the top end is higher than the bottom surface of the first overflow water distribution channel (41); The bottom end of the second partition plate (53) is connected to the bottom surface of the second inter-stage solid-liquid separation section (50), and the top end is higher than the bottom surface of the second overflow water distribution channel (51); The included angle between the bottom ends of the first mud slide (42) and the first partitioning plate (43) is 40-120°; The included angle between the bottom ends of the second mud slide (52) and the second partition plate (53) is 40-120 degrees.

4. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 1, characterized in that: The short-range nitrification-anaerobic ammonium oxidation section (30) is provided with a semicircular gallery partition (31), a biological carrier (34), a second aeration pipe system (33) and a submersible flow propeller (32) inside, and is connected to the sedimentation section (60) through a biochemical reaction zone outlet pipe (35).

5. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 4, characterized in that: The gallery partition (31) is semicircular, and comprises a first gallery partition and a second gallery partition that are arranged concentrically with opposite inner arcs, the radius of the first gallery partition is 70% to 85% of the radius of the short-range nitrification-anaerobic ammonium oxidation section (30), and the radius of the second gallery partition is 45% to 60% of the radius of the short-range nitrification-anaerobic ammonium oxidation section (30); The biological carrier (34) is selected from one of biological ropes, hollow suspended fillers or polyurethane foam.

6. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 1, characterized in that: The top of the sedimentation section (60) is provided with a water outlet channel (62) around it, and a flow stabilizing tube (65), a concentrator (68) and a mud collecting bucket (61) are provided inside. The flow stabilizing tube (65) is provided at the middle position of the sedimentation section (60) in the height direction and is connected to the water outlet pipe (35) of the biochemical reaction zone. The top of the concentrator (68) passes through the flow stabilizing tube (65) and extends out of the top of the sedimentation section (60) to be connected to an external agitator. The mud collecting bucket (61) is provided at the bottom of the sedimentation section (60) and is connected to an external mud discharge pipe (64).

7. The integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to claim 6, characterized in that: A water outlet trough (63) is arranged below the side of the water outlet channel (62) away from the mud collecting bucket (61), the distance between the water outlet channel (62) and the top of the integrated device is 300-900 mm, and the water outlet trough (63) is 200-500 mm lower than the water outlet channel (62).

8. A method for deep denitrification of ammonia nitrogen-containing wastewater, characterized in that: An integrated device for deep denitrification of ammonia nitrogen-containing wastewater according to any one of claims 1 to 7 specifically comprises the following steps: (S1) a portion of the wastewater containing ammonia nitrogen enters the denitrification section (10), and after treatment, denitrification section treated wastewater is obtained; (S2) the denitrification section treated sewage enters the short-cut nitrification section (20) through the stage partition plate (11), and after treatment, the short-cut nitrification section treated sewage is obtained, and part of the sludge in the short-cut nitrification section (20) is returned to the denitrification section (10); (S3) a portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the first interstage solid-liquid separation section (40), and another portion of the wastewater treated in the short-cut nitrification section flows back to the denitrification section (10) through the first interstage solid-liquid separation section (40) and the first effluent return assembly (80); (S4) another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section (100), and after treatment, high-load oxidation section treated wastewater is obtained; (S5) The wastewater treated in the high-load oxidation section enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the second interstage solid-liquid separation section (50); (S6) the short-cut nitrification-anaerobic ammonium oxidation section (30) treats the high-load oxidation section treated wastewater and the short-cut nitrification section treated wastewater to obtain the short-cut nitrification-anaerobic ammonium oxidation section treated wastewater; (S7) The short-cut nitrification-anaerobic ammonium oxidation section treats the wastewater and enters the sedimentation section (60) to obtain sludge and effluent from the integrated device. The sludge is directly discharged, and a portion of the effluent from the integrated device is returned to the denitrification section (10) through the second effluent return component (90), and the other portion is directly discharged.

9. A method for deep denitrification of ammonia nitrogen-containing wastewater according to claim 8, characterized in that: The surface load of the first interstage solid-liquid separation section (40) is 0.6 to 2.0 m 3 / m 2 / h; The surface load of the second interstage solid-liquid separation section (50) is 0.3 to 1.0 m 3 / m 2 / h; The surface load of the sedimentation section (60) is 1.5 to 2.0 m 3 / m 2 / h, The dissolved oxygen concentration in the short-range nitrification section (20) is 0.5 to 0.8 mg / L; The dissolved oxygen concentration in the high-load oxidation section (100) is 1.0 to 2.0 mg / L; The dissolved oxygen concentration in the short-cut nitrification-anaerobic ammonium oxidation section (30) is 0.1-0.3 mg / L.

10. A method for deep denitrification of ammonia nitrogen-containing wastewater according to claim 8, characterized in that: The return volume of sewage treated in the short-cut nitrification section accounts for 30% to 70% of the sewage treated in the short-cut nitrification section; the return volume of effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

Images