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

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to an integrated deep denitrification device for sewage containing ammonia nitrogen and a treatment method thereof. In an integrated deep denitrification device for sewage containing ammonia nitrogen of the present invention, each reaction section is closely 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, the shortcomings of low denitrification efficiency, poor operation stability, large floor space, and many monomer structures when treating sewage with traditional biochemical technology are overcome; 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 deep denitrification device for sewage containing ammonia nitrogen 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 deep denitrification device for ammonia-nitrogen-containing sewage and a treatment method thereof. In an integrated deep denitrification device for ammonia-nitrogen-containing sewage of the present invention, each reaction section is 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, the shortcomings of low denitrification efficiency, poor operation stability, large floor space, and many monomer structures when treating sewage with traditional biochemical technology are overcome; 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 deep denitrification device for ammonia-nitrogen-containing sewage, which is connected to an external ammonia-nitrogen-containing sewage inlet pipe and a mud discharge pipe when in use, and is characterized in that the deep denitrification device is a multi-zone rectangular structure, including a denitrification section, a high-load oxidation section, a short-range nitrification section, a short-range nitrification-anaerobic ammonia oxidation section and a precipitation section;

[0006] The denitrification section and the high-load oxidation section are connected to the external ammonia nitrogen-containing sewage inlet pipe; the denitrification section is connected to the short-range nitrification section through the stage partition, the short-range nitrification section is connected to the short-range nitrification-anaerobic ammonium oxidation section through the first interstage solid-liquid separation section, the high-load oxidation section is connected to the denitrification section through the second interstage solid-liquid separation section, the short-range nitrification-anaerobic ammonium 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 second 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] In the present invention, the denitrification section is used to utilize organic matter in external high-ammonia nitrogen 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 high-load oxidation section is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0011] The short-range nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0012] 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;

[0013] 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;

[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 stage partition is provided with a plurality of flow holes allowing the ammonia nitrogen-containing sewage (mud and water mixture) to flow through.

[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, a submersible flow propeller and a gallery partition are provided in the denitrification section;

[0020] The short-range nitrification section is provided with a gallery partition, a submersible flow propeller and a first aeration pipe system;

[0021] A third aeration pipe system is arranged inside the high-load oxidation section;

[0022] 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 high-load oxidation section, and is connected to the denitrification section through a first partition plate;

[0023] 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 short-range nitrification section, and is connected to the short-range nitrification-anaerobic ammonium oxidation section through a second partition plate.

[0024] 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;

[0025] The first outlet water return assembly includes a first outlet water return pipe and a first outlet water return pump, the second 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;

[0026] 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.

[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 gallery partition, a biological carrier, a second aeration pipe system and a submersible flow propeller, and is connected to the sedimentation section through a water outlet pipe of the biochemical reaction zone.

[0034] In one embodiment of the present invention, 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, and the filling rate is 40% to 60%.

[0035] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0036] 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 cylinder and extends out of the top of a sedimentation section to be connected to an external mixer;

[0037] The mud collecting buckets are arranged in a plurality along the length direction of the sedimentation section.

[0038] 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.

[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 an integrated treatment method for deep denitrification of wastewater containing ammonia nitrogen, based on the above-mentioned integrated deep denitrification device for wastewater containing ammonia nitrogen, specifically comprising the following steps:

[0041] (1) A portion of the wastewater containing ammonia nitrogen enters the denitrification stage, where nitric nitrogen is removed and organic matter in the wastewater containing ammonia nitrogen is consumed to obtain wastewater treated by the denitrification stage;

[0042] (2) The denitrification stage treated wastewater enters the short-cut nitrification stage, where part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining short-cut nitrification stage treated wastewater;

[0043] (3) A portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section through the second interstage solid-liquid separation section, and the other portion flows back to the denitrification section through the second interstage solid-liquid separation section and the first effluent return component;

[0044] (4) Another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section to remove organic matter from the wastewater containing ammonia nitrogen, thereby obtaining wastewater treated by the high-load oxidation section;

[0045] (5) The wastewater treated in the high-load oxidation section enters the short-range nitrification-anaerobic ammonium oxidation section through the first interstage solid-liquid separation section;

[0046] (6) The short-cut nitrification-anaerobic ammonium oxidation section treats the wastewater treated in the high-load oxidation section and the wastewater treated in the short-cut nitrification section to achieve the simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining the wastewater treated in the short-cut nitrification-anaerobic ammonium oxidation section;

[0047] (7) The short-range nitrification-anaerobic ammonium oxidation section treats wastewater and enters the sedimentation section to obtain sludge and device effluent. The sludge is discharged directly, and part of the device effluent is returned to the denitrification section through the second effluent return component, and the other part is discharged directly.

[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 1.5 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 to 500 r / min; the volume load of the device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 1.0 to 5.0 kg BOD5 / 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 the wastewater treated in the short-cut nitrification stage accounts for 30% to 70% of the wastewater treated in the short-cut nitrification stage; the return volume of the effluent from the device accounts for 20% to 70% of the effluent from the device.

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

[0057] (1) The integrated deep denitrification device for 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 deep denitrification device for 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 deep denitrification device for 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 deep denitrification device for ammonia-nitrogen-containing wastewater of the present invention adopts a short-range nitrification stage connected in series with a short-range nitrification-anaerobic ammonium oxidation stage 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 a stable and efficient denitrification performance.

[0061] (5) The integrated deep denitrification device for 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 ammonia nitrogen-containing wastewater deep denitrification device provided by the present invention;

[0063] Figure 2 A process development diagram of an integrated ammonia-nitrogen-containing wastewater deep denitrification device 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. Sedimentation section; 50. First interstage solid-liquid separation section; 60. Second interstage solid-liquid separation section; 70. Submersible flow propeller; 80. First effluent return assembly; 90. Second effluent return assembly; 100. High-load oxidation section; 11. Gallery partition; 12. Interstage partition; 21. First aeration pipe system; 22. Sludge return pump; 31. Second aeration pipe system; 32. Biological Carrier; 33. Biochemical reaction zone outlet pipe; 41. Mud collecting bucket; 42. Outlet channel; 43. Outlet trough; 44. Mud discharge pipe; 45. Flow stabilizing cylinder; 46. Water distribution port; 47. Cylinder bottom plate; 48. Concentrator; 51. First overflow water distribution channel; 52. First mud slide plate; 53. First partition baffle; 61. Second overflow water distribution channel; 62. Second mud slide plate; 63. Second partition baffle; 81. First outlet return pump; 91. Second outlet return pump; 101. Third aeration pipe system. DETAILED DESCRIPTION

[0065] The present invention provides an integrated ammonia nitrogen-containing sewage deep denitrification device, which is connected to an external ammonia nitrogen-containing sewage inlet pipe and a mud discharge pipe when in use, and is characterized in that the deep denitrification device is a multi-zone rectangular structure, including a denitrification section, a high-load oxidation section, a short-range nitrification section, a short-range nitrification-anaerobic ammonia oxidation section and a precipitation section;

[0066] The denitrification section and the high-load oxidation section are connected to the external ammonia nitrogen-containing sewage inlet pipe; the denitrification section is connected to the short-range nitrification section through the stage partition, the short-range nitrification section is connected to the short-range nitrification-anaerobic ammonium oxidation section through the first interstage solid-liquid separation section, the high-load oxidation section is connected to the denitrification section through the second interstage solid-liquid separation section, the short-range nitrification-anaerobic ammonium 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 second 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] In the present invention, the denitrification section is used to utilize organic matter in external high-ammonia nitrogen 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 high-load oxidation section is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0071] The short-range nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0072] 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;

[0073] 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;

[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 stage partition is provided with a plurality of flow holes allowing the ammonia nitrogen-containing sewage (mud and water mixture) to flow through.

[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, a submersible flow propeller and a gallery partition are provided in the denitrification section;

[0080] The short-range nitrification section is provided with a gallery partition, a submersible flow propeller and a first aeration pipe system;

[0081] A third aeration pipe system is arranged inside the high-load oxidation section;

[0082] 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 high-load oxidation section, and is connected to the denitrification section through a first partition plate;

[0083] 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 short-range nitrification section, and is connected to the short-range nitrification-anaerobic ammonium oxidation section through a second partition plate.

[0084] 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;

[0085] The first outlet water return assembly includes a first outlet water return pipe and a first outlet water return pump, the second 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;

[0086] 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.

[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 gallery partition, a biological carrier, a second aeration pipe system and a submersible flow propeller, and is connected to the sedimentation section through a water outlet pipe of the biochemical reaction zone.

[0094] In one embodiment of the present invention, 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, and the filling rate is 40% to 60%.

[0095] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0096] 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 cylinder and extends out of the top of a sedimentation section to be connected to an external mixer;

[0097] The mud collecting buckets are arranged in a plurality along the length direction of the sedimentation section.

[0098] 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.

[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 an integrated treatment method for deep denitrification of wastewater containing ammonia nitrogen, based on the above-mentioned integrated deep denitrification device for wastewater containing ammonia nitrogen, specifically comprising the following steps:

[0101] (1) A portion of the wastewater containing ammonia nitrogen enters the denitrification stage, where nitric nitrogen is removed and organic matter in the wastewater containing ammonia nitrogen is consumed to obtain wastewater treated by the denitrification stage;

[0102] (2) The denitrification stage treated wastewater enters the short-cut nitrification stage, where part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining short-cut nitrification stage treated wastewater;

[0103] (3) A portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section through the second interstage solid-liquid separation section, and the other portion flows back to the denitrification section through the second interstage solid-liquid separation section and the first effluent return component;

[0104] (4) Another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section to remove organic matter from the wastewater containing ammonia nitrogen, thereby obtaining wastewater treated by the high-load oxidation section;

[0105] (5) The wastewater treated in the high-load oxidation section enters the short-range nitrification-anaerobic ammonium oxidation section through the first interstage solid-liquid separation section;

[0106] (6) The short-cut nitrification-anaerobic ammonium oxidation section treats the wastewater treated in the high-load oxidation section and the wastewater treated in the short-cut nitrification section to achieve the simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining the wastewater treated in the short-cut nitrification-anaerobic ammonium oxidation section;

[0107] (7) The short-range nitrification-anaerobic ammonium oxidation section treats wastewater and enters the sedimentation section to obtain sludge and device effluent. The sludge is discharged directly, and part of the device effluent is returned to the denitrification section through the second effluent return component, and the other part is discharged directly.

[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 1.5 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 to 500 r / min; the volume load of the device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 1.0 to 5.0 kg BOD5 / 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 the wastewater treated in the short-cut nitrification stage accounts for 30% to 70% of the wastewater treated in the short-cut nitrification stage; the return volume of the effluent from the device accounts for 20% to 70% of the effluent from the 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 deep denitrification device for ammonia-nitrogen-containing wastewater is a multi-zone rectangular structure, including a denitrification section 10, a short-range nitrification section 20, a short-range nitrification anaerobic ammonia oxidation section 30, a precipitation section 40, and a high-load oxidation section 100;

[0122] The total height of the integrated device is 5 to 8 meters, 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 1:4:2:0.5;

[0123] The denitrification section 10 and the high-load oxidation section 100 are connected to the external ammonia nitrogen-containing sewage inlet pipe; the denitrification section 10 is provided with a submersible flow propeller 70 and a gallery partition 11, the short-range nitrification section 20 is provided with a gallery partition 11, a submersible flow propeller 70 and a first aeration pipe system 21, and the high-load oxidation section 100 is provided with a third aeration pipe system 101; the denitrification section 10 is connected to the short-range nitrification section 20 through a stage partition 12, and the stage partition 12 is provided with a plurality of flow holes allowing ammonia nitrogen-containing sewage (mud and water mixture) to flow through; the short-range nitrification section 20 is connected to the short-range nitrification-anaerobic ammonia oxidation section 30 through a first interstage solid-liquid separation section 50, and a first overflow water distribution channel 51 is provided around the top of the first interstage solid-liquid separation section 50, and the first interstage solid-liquid separation section 50 is connected to the short-range nitrification-anaerobic ammonia oxidation section 30. A first mud slide 52 is provided between the high-load oxidation sections 100, and is connected to the denitrification section 10 through a first partition partition 53; the bottom end of the first mud slide 52 is higher than the bottom surface of the first interstage solid-liquid separation section 50, and the top end is higher than the bottom surface of the first overflow water distribution channel 51; the bottom end of the first partition partition 53 is connected to the bottom surface of the first interstage solid-liquid separation section 50, and the top end is higher than the bottom surface of the first overflow water distribution channel 51; the angle between the first mud slide 52 and the bottom end of the first partition partition 53 is 80°; the short-range nitrification section 20 is also connected to the denitrification section 10 through a sludge return assembly, and the sludge return assembly includes a sludge return pump 22 and a sludge return pipe, the short-range 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;

[0124] The high-load oxidation section 100 is connected to the denitrification section 10 through the second interstage solid-liquid separation section 60, and the second interstage solid-liquid separation section 60 is connected to the denitrification section 10 through the first effluent reflux component 80. A second overflow water distribution channel 61 is arranged around the top of the second interstage solid-liquid separation section 60. A second mud slide 62 is arranged between the second interstage solid-liquid separation section 60 and the short-range nitrification section 20, and is connected to the short-range nitrification-anaerobic ammonium oxidation section 30 through a second partition partition 63; the bottom end of the second mud slide 62 is higher than the bottom surface of the second interstage solid-liquid separation section 60, The top is higher than the bottom surface of the second overflow water distribution channel 61; the bottom end of the second partition baffle 63 is connected to the bottom surface of the second interstage solid-liquid separation section 60, and the top is higher than the bottom surface of the second overflow water distribution channel 61; the angle between the second mud slide 62 and the bottom end of the second partition baffle 63 is 80°; the first outlet water return assembly 80 includes a first outlet water return pipe and a first outlet water return pump 81, the second overflow water distribution channel 61 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;

[0125] The short-range nitrification-anaerobic ammonium oxidation section 30 is provided with a gallery partition 11, a biological carrier 32, a second aeration pipe system 31 and a submersible flow propeller 70. The biological carrier 32 is a biological rope, which is placed in a fixed manner and has a filling rate of 40%. The short-range nitrification-anaerobic ammonium oxidation section 30 is also connected to the sedimentation section 40 through a biochemical reaction zone outlet pipe 33.

[0126] A water outlet channel 42 is arranged around the top of the sedimentation section 40. A water outlet trough 43 is arranged below the side of the water outlet channel 42 away from the mud collecting bucket 41. The distance between the water outlet channel 42 and the top of the integrated device is 900 mm, and the water outlet trough 43 is 300 mm lower than the water outlet channel 42. A flow stabilizing cylinder 45, a concentrator 48 and a mud collecting bucket 41 are arranged inside the sedimentation section 40. The flow stabilizing cylinder 45 is arranged at the middle position in the height direction of the sedimentation section 40 and is connected to the water outlet pipe 33 of the biochemical reaction zone. The bottom plate of the flow stabilizing cylinder 45 is a cylinder bottom plate 46, and a water distribution port 46 is arranged on the cylinder bottom plate 46. The concentrator 48 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 45 and extends out of the top of the sedimentation section 40 to connect with the external mixer. ; Several mud collecting buckets 41 are arranged along the length direction of the sedimentation section 40 (multi-mud bucket layout), and are connected to the external mud discharge pipe 44; the sedimentation section 40 is connected to the denitrification section 10 through the second outlet water return component 90; the second outlet water return component 90 includes a second outlet water return pipe and a second outlet water return pump 91, the outlet trough 43 is connected to the second outlet water return pipe through the second outlet water return pipe, and the second outlet water return pump 91 is connected to the denitrification section 10 through the second outlet water return pipe.

[0127] The denitrification section 10 is used to utilize the organic matter in the external high-ammonia nitrogen sewage to remove the 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 on subsequent anaerobic ammonia oxidation and other biochemical processes, and enhancing the operation stability;

[0128] The high-load oxidation section 100 is used to remove organic matter from external ammonia nitrogen-containing sewage;

[0129] The short-range nitrification section 20 is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0130] The first inter-stage solid-liquid separation section 50 is used to achieve solid-liquid separation of sewage and divert the sewage to the short-range nitrification-anaerobic ammonium oxidation section 30;

[0131] The second interstage solid-liquid separation section 60 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;

[0132] The short-cut nitrification-anaerobic ammonium oxidation section 30 is used to achieve deep denitrification of sewage;

[0133] The sedimentation section 40 is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0134] Example 2

[0135] This embodiment provides an integrated treatment method for deep denitrification of wastewater containing ammonia nitrogen, based on the integrated deep denitrification device for wastewater containing ammonia nitrogen of Example 1, specifically comprising the following steps:

[0136] (1) A portion of the wastewater containing ammonia nitrogen enters the denitrification section 10, where nitric nitrogen is removed and organic matter in the wastewater containing ammonia nitrogen is consumed to obtain wastewater treated by the denitrification section;

[0137] The flow velocity of the submersible flow generator 70 in the denitrification section 10 is 0.2 m / s;

[0138] (2) The denitrification stage treated wastewater enters the short-cut nitrification stage 20, where part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining short-cut nitrification stage treated wastewater;

[0139] The dissolved oxygen concentration of the short-range nitrification section 20 is 0.5-0.8 mg / L; the flow velocity of the submersible flow generator 70 in the short-range nitrification section 20 is 0.2 m / s;

[0140] (3) A portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section 30 through the second interstage solid-liquid separation section 60, and the other portion flows back to the denitrification section 10 through the second interstage solid-liquid separation section 60 and the first effluent return assembly 80;

[0141] Among them, the return flow of sewage treated in the short-range nitrification section accounts for 40% of the sewage treated in the short-range nitrification section 20; the surface load at the solid-liquid separation end of the second stage is 0.5m 3 / m 2 / h;

[0142] (4) Another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section 100 to remove organic matter from the wastewater containing ammonia nitrogen, thereby obtaining wastewater treated by the high-load oxidation section;

[0143] Wherein, the dissolved oxygen concentration of the high-load oxidation section 100 is 1.0 to 2.0 mg / L;

[0144] (5) The wastewater treated in the high-load oxidation stage enters the short-range nitrification-anaerobic ammonia oxidation stage 30 through the first interstage solid-liquid separation stage 50 to replenish ammonia nitrogen and adjust the ammonia nitrogen / nitrite nitrogen ratio;

[0145] The surface load of the first interstage solid-liquid separation section 50 is 2.0 m 3 / m 2 / h;

[0146] (6) The short-cut nitrification-anaerobic ammonium oxidation section 30 treats the wastewater treated in the high-load oxidation section and the wastewater treated in the short-cut nitrification section 20 to achieve the simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining the wastewater treated in the short-cut nitrification-anaerobic ammonium oxidation section;

[0147] The dissolved oxygen concentration of the short-range nitrification-anaerobic ammonium oxidation section 30 is 0.1-0.3 mg / L, and the flow velocity of the submersible flow propeller 70 in the short-range nitrification-anaerobic ammonium oxidation section 30 is 0.2 m / s.

[0148] (7) The short-cut nitrification-anaerobic ammonium oxidation stage treats wastewater and enters the sedimentation stage 40 to obtain sludge and device effluent. The sludge is directly discharged, and part of the device effluent is refluxed to the denitrification stage 10 through the second effluent return component 90 (using organic matter in the ammonia nitrogen-containing wastewater to remove the nitrate nitrogen byproducts produced by short-cut nitrification, thereby enhancing the total nitrogen removal rate of the device), and the other part is directly discharged;

[0149] The surface load of the sedimentation section 40 is 1.0 m 3 / m 2 / h, the volume load of the device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 3.0kg BOD5 / m 3 / d; the return flow of the device's outlet water accounts for 50% of the device's outlet water flow.

[0150] Example 3

[0151] This embodiment provides an integrated device for deep denitrification of wastewater containing ammonia nitrogen.

[0152] Compared with Example 1, this embodiment has the following features: 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, and the surface loads of the first interstage solid-liquid separation section 50 and the second interstage solid-liquid separation section 60 are both 1.0 m 3 / m 2 / h, the volume load of the 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 52 and the first partition baffle 53, the installation angle between the second mud slide 62 and the second partition baffle 63 is 70°, the flow velocity of the submersible flow propeller 70 is 0.4m / s, the type of biological carrier 32 is hollow suspended filler, the filling rate is 50%, and the carrier delivery form is fluidized. ", everything else is the same as Example 1.

[0153] 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 ammonia nitrogen-containing sewage deep denitrification device, which is connected to an external ammonia nitrogen-containing sewage inlet pipe and a mud discharge pipe (44) when in use, and is characterized in that: The deep denitrification device is a multi-zone rectangular structure, comprising a denitrification section (10), a high-load oxidation section (100), a short-range nitrification section (20), a short-range nitrification-anaerobic ammonium oxidation section (30) and a precipitation section (40); The denitrification section (10) and the high-load oxidation section (100) are connected to an external ammonia nitrogen-containing sewage inlet pipe; the denitrification section (10) is connected to the short-range nitrification section (20) through a stage partition plate (21); the short-range nitrification section (20) is connected to the short-range nitrification-anaerobic ammonium oxidation section (30) through a second interstage solid-liquid separation section (60); the high-load oxidation section (100) is connected to the short-range nitrification-anaerobic ammonium oxidation section (30) through a first interstage solid-liquid separation section (50); the short-range nitrification-anaerobic ammonium oxidation section (30) is connected to the sedimentation section (40) through a biochemical reaction zone outlet pipe (33); and the sedimentation section (40) is connected to an external mud discharge pipe (44); The short-range nitrification section (20) is connected to the denitrification section (10) via a sludge return assembly, the second interstage solid-liquid separation section (60) is connected to the denitrification section (10) via a first effluent return assembly (80), and the sedimentation section (40) 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; The denitrification section (10) is provided with a submersible flow propeller (70) and a gallery partition (11); The short-range nitrification section (20) is provided with a gallery partition (11), a submersible flow propeller (70) and a first aeration pipe system (21); A third aeration pipe system 101 is provided inside the high-load oxidation section (100); A first overflow water distribution channel (51) is arranged around the top of the first interstage solid-liquid separation section (50), and a first mud slide (52) is arranged between the first interstage solid-liquid separation section (50) and the high-load oxidation section (100); A second overflow water distribution channel (61) is arranged around the top of the second interstage solid-liquid separation section (60); a second mud slide (62) is arranged between the second interstage solid-liquid separation section (60) and the short-distance nitrification section (20), and is connected to the short-distance nitrification-anaerobic ammonium oxidation section (30) via a second partition plate (63); The bottom end of the first mud slide (52) is higher than the bottom surface of the first inter-stage solid-liquid separation section (50), and the top end is higher than the bottom surface of the first overflow water distribution channel (51); The bottom end of the second mud slide (62) is higher than the bottom surface of the second inter-stage solid-liquid separation section (60), and the top end is higher than the lower bottom surface of the second overflow water distribution channel (61); The bottom end of the first partition plate (53) is connected to the bottom surface of the first inter-stage solid-liquid separation section (50), and the top end is higher than the bottom surface of the first overflow water distribution channel (51); The bottom end of the second partition plate (63) is connected to the bottom surface of the second inter-stage solid-liquid separation section (60), and the top end is higher than the bottom surface of the second overflow water distribution channel (61); The included angle between the bottom ends of the first mud slide (52) and the first partition plate (53) is 40-120°; The included angle between the bottom ends of the second mud slide (62) and the second partition plate (63) is 40-120°; The short-range nitrification-anaerobic ammonium oxidation section (30) is provided with a gallery partition (11), a biological carrier (32), a second aeration pipe system (31) and a submersible flow propeller (70) inside, and is connected to the sedimentation section (40) through a biochemical reaction zone outlet pipe (33); The top of the sedimentation section (40) is provided with a water outlet channel (42) around it, and a flow stabilizing tube (45), a concentrator (48) and a mud collecting bucket (41) are provided inside. The flow stabilizing tube (45) is provided at the middle position of the sedimentation section (40) in the height direction and is connected to the water outlet pipe (33) of the biochemical reaction zone. The top of the concentrator (48) passes through the flow stabilizing tube (45) and extends out of the top of the sedimentation section (40) to be connected to an external agitator. The mud collecting bucket (41) is provided at the bottom of the sedimentation section (40) and is connected to an external mud discharge pipe (44).

2. The integrated ammonia nitrogen-containing wastewater deep denitrification device according to claim 1 is characterized in that: The biological carrier (32) is selected from one of biological ropes, hollow suspended fillers or polyurethane foam.

3. The integrated ammonia nitrogen-containing wastewater deep denitrification device according to claim 1 is characterized in that: A water outlet trough (43) is arranged below the side of the water outlet channel (42) away from the mud collecting bucket (41), the distance between the water outlet channel (42) and the top of the integrated device is 300-900 mm, and the water outlet trough (43) is 200-500 mm lower than the water outlet channel (42).

4. An integrated method for deep denitrification of wastewater containing ammonia nitrogen, characterized in that: An integrated ammonia nitrogen-containing wastewater deep denitrification device according to any one of claims 1 to 3 specifically comprises the following steps: (1) A portion of the wastewater containing ammonia nitrogen enters the denitrification section (10), where nitrate nitrogen is removed and organic matter in the wastewater containing ammonia nitrogen is consumed to obtain wastewater treated by the denitrification section; (2) The denitrification section treated wastewater enters the short-cut nitrification section (20), where part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining short-cut nitrification section treated wastewater; (3) A portion of the wastewater treated in the short-cut nitrification section enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the second interstage solid-liquid separation section (60), and the other portion flows back to the denitrification section (10) through the second interstage solid-liquid separation section (60) and the first effluent return component (80); (4) Another part of the wastewater containing ammonia nitrogen enters the high-load oxidation section (100), where organic matter in the wastewater containing ammonia nitrogen is removed to obtain wastewater treated in the high-load oxidation section; (5) The wastewater treated in the high-load oxidation section enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the first interstage solid-liquid separation section (50); (6) The short-cut nitrification-anaerobic ammonium oxidation section (30) treats the wastewater treated in the high-load oxidation section and the wastewater treated in the short-cut nitrification section to achieve the simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining the wastewater treated in the short-cut nitrification-anaerobic ammonium oxidation section; (7) The short-cut nitrification-anaerobic ammonium oxidation section treats wastewater and enters the sedimentation section (40) to obtain sludge and device effluent. The sludge is discharged directly, and part of the device effluent is returned to the denitrification section (10) through the second effluent return component (90), and the other part is discharged directly.

5. The integrated treatment method for deep denitrification of ammonia-nitrogen-containing wastewater according to claim 4 is characterized in that: The surface load of the first interstage solid-liquid separation section (50) is 0.6 to 2.0 m 3 / m 2 / h; The surface load of the second interstage solid-liquid separation section (60) is 0.3 to 1.5 m 3 / m 2 / h; The surface load of the sedimentation section (40) 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.

6. The integrated treatment method for deep denitrification of ammonia-nitrogen-containing wastewater according to claim 4 is characterized in that: The return volume of sewage treated in the short-cut nitrification section (20) accounts for 30% to 70% of the sewage treated in the short-cut nitrification section (20); and the return volume of effluent from the device accounts for 20% to 70% of the effluent from the device.

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