An integrated device for deep denitrification of high-ammonia nitrogen wastewater and its treatment method

Abstract

The present invention relates to the field of sewage treatment technology, and in particular to an integrated device for deep denitrification of high-ammonia nitrogen sewage and a treatment method thereof. In the integrated device for deep denitrification of high-ammonia nitrogen sewage of the present invention, the reaction sections are tightly integrated in space, the tank body is constructed as a whole, and head loss is small. Through the synergistic multi-stage and multi-biochemical process, the device overcomes the shortcomings of traditional biochemical technology in treating high-ammonia nitrogen sewage, such as low denitrification efficiency, poor operational stability, large floor space, and multiple single structures. The device has denitrification, short-range nitrification, and short-range nitrification-anaerobic ammonia oxidation functions, and has the advantages of high denitrification efficiency, stable operation, high integration, and a 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 high-ammonia nitrogen sewage and a treatment method thereof. Background Art

[0002] Traditional biochemical sewage treatment has a limited sludge volume load, resulting in limited sewage treatment capacity. This results in low efficiency of the device (equipment) for treating high-ammonia nitrogen sewage, making it unable to cope with large load shocks. In addition, the device occupies a large area and 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 high-ammonia nitrogen sewage remains one of the main problems that need to be faced. Currently, there are many technologies and devices for the treatment of high-ammonia nitrogen sewage, and a variety of technical methods are used. However, the existing technologies and devices have their own shortcomings. Chemical treatment cannot effectively denitrify sewage, while traditional biological treatment devices have low treatment efficiency, poor operational stability, low integration, and a large footprint. 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 high-ammonia nitrogen wastewater and its treatment method. In the integrated device for deep denitrification of high-ammonia nitrogen wastewater of the present invention, the reaction sections are tightly integrated 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 traditional biochemical technology in treating high-ammonia nitrogen wastewater, such as low denitrification efficiency, poor operational stability, large footprint, and multiple single structures. It has denitrification, short-range nitrification, and short-range nitrification-anaerobic ammonium oxidation functions, and has the advantages of high denitrification efficiency, stable operation, high integration, and small footprint.

[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 high-ammonia nitrogen wastewater. When in use, the device is connected to an external high-ammonia nitrogen wastewater inlet pipe and a mud discharge pipe. The device has a multi-layered annular structure, which comprises, from the outside to the inside, a denitrification section, a short-cut nitrification section, a short-cut nitrification-anaerobic ammonium oxidation section, and a sedimentation section. A first interstage solid-liquid separation section and a second interstage solid-liquid separation section are respectively provided between the denitrification section and the short-cut nitrification section. The short-cut nitrification-anaerobic ammonium oxidation section is connected to the sedimentation section via a biochemical reaction zone outlet pipe, and the sedimentation section is connected to an external mud discharge pipe.

[0006] The second interstage solid-liquid separation section is connected to the denitrification section via a first reflux component, and the precipitation section is connected to the denitrification section via a second reflux component;

[0007] Among them, the volume ratio of the denitrification section, the short-cut nitrification section and the short-cut nitrification-anaerobic ammonium oxidation section is 1:2-4:1.5-5;

[0008] The denitrification section is used to utilize organic matter in external high-ammonia nitrogen wastewater to remove nitric nitrogen in the return wastewater of the short-cut nitrification-anaerobic ammonium oxidation section, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter on subsequent anaerobic ammonium oxidation and other biochemical processes, and enhancing operational stability;

[0009] The short-cut nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0010] The first inter-stage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the short-cut nitrification section and the short-cut nitrification-anaerobic ammonium oxidation section;

[0011] The second inter-stage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the denitrification section and the short-cut nitrification-anaerobic ammonium oxidation section;

[0012] The short-cut nitrification-anaerobic ammonium oxidation section is used to achieve deep denitrification of sewage;

[0013] The sedimentation section is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0014] In one embodiment of the present invention, the total height of the integrated device is 5 to 8 meters.

[0015] In one embodiment of the present invention, when the concentrations of nitrate nitrogen and COD in the influent of the integrated device are high, it is necessary to increase the volume proportion of the denitrification section; when the concentration of ammonia nitrogen in the influent of the integrated device is high, it is necessary to increase the volume proportion of the short-cut nitrification section and the short-cut nitrification-anaerobic ammonia oxidation section.

[0016] In one embodiment of the present invention, a stirring device is provided in the denitrification section;

[0017] The short-range nitrification section is provided with a stirring device and a first aeration pipe system;

[0018] A first overflow water distribution channel is provided around the top of the first interstage solid-liquid separation section, a first mud slide is provided between the first interstage solid-liquid separation section and the denitrification section, and the first partition plate is connected to the short-range nitrification section;

[0019] A second overflow water distribution channel is provided around the top of the second interstage solid-liquid separation section, a second mud slide is provided between the second interstage solid-liquid separation section and the short-range nitrification section, and the second mud slide is connected to the denitrification section through a second partition plate;

[0020] 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 water outlet pipe of the biochemical reaction zone;

[0021] The top of the sedimentation section is surrounded by water outlet channels, and a flow stabilizing tube, a concentrator and a mud collecting hopper are arranged inside. The flow stabilizing tube is arranged in the middle position in the height direction of the sedimentation section and is connected to the water outlet pipe of the biochemical reaction area. The top of the concentrator passes through the flow stabilizing tube and extends out to the top of the sedimentation section to be connected to the external mixer. The mud collecting hopper is arranged at the bottom of the sedimentation section and is connected to the external mud discharge pipe.

[0022] In one embodiment of the present invention, the second overflow water distribution channel is connected to the denitrification section via a first reflux component;

[0023] The first reflux component includes a first reflux pipe and a first reflux pump. The second overflow water distribution channel is connected to the first reflux pump through the first reflux pipe. The first reflux pump is connected to the denitrification section through the first reflux pipe.

[0024] In one embodiment of the present invention, the bottom end of the first mud slide is higher than the bottom surface of the first inter-stage solid-liquid separation section, and the top end is higher than the lower bottom surface of the first overflow water distribution channel;

[0025] The bottom end of the second mud slide is higher than 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;

[0026] The bottom end of the first partition plate is connected to the bottom surface of the first interstage solid-liquid separation section, and the top end is higher than the bottom surface of the first overflow distribution channel;

[0027] 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 bottom surface of the second overflow distribution channel;

[0028] The lower bottom surface of the first overflow water distribution channel is higher than the lower bottom surface of the second overflow water distribution channel;

[0029] The angle between the first mud slide and the bottom end of the first partition plate is 40 to 120 degrees;

[0030] The included angle between the second mud slide and the bottom end of the second partition plate is 40 to 120 degrees.

[0031] In one embodiment of the present invention, the corridor partition is semicircular, including a first corridor partition and a second corridor partition with opposite inner arcs and concentrically arranged, the radius of the first corridor partition is 70% to 85% of the radius of the shortcut nitrification-anaerobic ammonium oxidation section, and the radius of the second corridor partition is 45% to 60% of the radius of the shortcut nitrification-anaerobic ammonium oxidation section;

[0032] 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 type and fixed type, and the filling rate is 40% to 60%.

[0033] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0034] 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 the flow stabilizing cylinder and extends out of the top of the sedimentation section to be connected to an external mixer.

[0035] 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 distance between the water outlet channel and the top of the integrated device is 300 to 900 mm, and the water outlet trough is 200 to 500 mm lower than the water outlet channel;

[0036] The outlet trough is connected to the denitrification section through a second reflux component to remove nitric nitrogen produced by the anaerobic ammonium oxidation process and enhance the total nitrogen removal rate; the second reflux component includes a second reflux pipe and a second reflux pump, the outlet trough is connected to the second reflux pump through the second reflux pipe, and the second reflux pump is connected to the denitrification section through the second reflux pipe.

[0037] The second object of the present invention is to provide a treatment method for deep denitrification of high-ammonia nitrogen wastewater, based on the above-mentioned integrated device for deep denitrification of high-ammonia nitrogen wastewater, which specifically includes the following steps:

[0038] (S1) The high-ammonia nitrogen wastewater enters the denitrification section to remove nitrate nitrogen and consume organic matter in the high-ammonia nitrogen wastewater to obtain primary treated wastewater;

[0039] (S2) a portion of the primary treated wastewater passes through the first interstage solid-liquid separation section and enters the short-cut nitrification section, where part of the ammonia nitrogen is converted into nitrite nitrogen to obtain secondary treated wastewater; another portion of the primary treated wastewater passes through the first interstage solid-liquid separation section and enters the short-cut nitrification-anaerobic ammonium oxidation section;

[0040] (S3) a portion of the secondary treated wastewater is returned to the denitrification section, and another portion of the secondary treated wastewater passes through the second interstage solid-liquid separation section and enters the short-cut nitrification-anaerobic ammonium oxidation section to achieve simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining tertiary treated wastewater;

[0041] (S4) The tertiary treated wastewater enters the sedimentation section to obtain sludge and effluent from the integrated device. The sludge is discharged directly, and part of the effluent from the integrated device is returned to the denitrification section, and the other part is discharged directly.

[0042] 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;

[0043] The surface load of the second interstage solid-liquid separation section is 0.6 to 2.0 m 3 / m 2 / h;

[0044] The surface load of the sedimentation section is 1.5 to 2.0 m 3 / m 2 / h,

[0045] The dissolved oxygen concentration in the short-range nitrification section is 0.5-0.8 mg / L;

[0046] The dissolved oxygen concentration in the short-range nitrification-anaerobic ammonium oxidation section is 0.1-0.3 mg / L.

[0047] In one embodiment of the present invention, the stirring speed of the stirring device is set in the range of 50 to 500 r / min; the volume load of the device during 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.

[0048] In one embodiment of the present invention, the return flow of the secondary treated sewage accounts for 30% to 70% of the primary treated sewage entering the short-cut nitrification section; the return flow of the effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] (1) The integrated device for deep denitrification of high-ammonia nitrogen wastewater of the present invention adopts the denitrification-short-cut nitrification-anaerobic ammonia oxidation multi-biochemical process coupling technology, has high volumetric load and high denitrification efficiency, and can operate stably and efficiently in a high-concentration ammonia nitrogen environment.

[0051] (2) The integrated device for deep denitrification of high-ammonia nitrogen 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, thereby enhancing operational stability.

[0052] (3) The integrated device for deep denitrification of high-ammonia nitrogen wastewater of the present invention adopts a short-range nitrification section in series with a short-range nitrification-anaerobic ammonium oxidation section 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.

[0053] (4) The integrated device for deep denitrification of high-ammonia nitrogen wastewater of the present invention has a small footprint, high integration, a neat appearance, and high space utilization. Most of the motors involved in the reaction are located outside the device, making maintenance easy. The device integrates biochemical and secondary sedimentation, achieving a close integration of the reaction tanks in a three-dimensional space, and significantly increases the wastewater treatment capacity per unit volume compared to traditional processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a top cross-sectional view of an integrated device for deep denitrification of high-ammonia nitrogen wastewater according to the present invention;

[0055] Figure 2 This is a process expansion diagram of an integrated device for deep denitrification of high-ammonia nitrogen wastewater according to the present invention;

[0056] Numbers in the figure: 10. Denitrification section; 20. Short-cut nitrification section; 30. Short-cut 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 reflux assembly; 90. Second reflux assembly; 21. First aeration piping system; 31. Gallery partition; 32. Submersible flow propeller; 33. Second aeration piping system; 34. Biological carrier; 35. 5. Biochemical reaction zone outlet pipe; 41. First overflow distribution channel; 42. First mud slide; 43. First partition baffle; 51. Second overflow distribution channel; 52. Second mud slide; 53. Second partition baffle; 61. Mud collecting hopper; 62. Outlet channel; 63. Outlet trough; 64. Mud discharge pipe; 65. Flow stabilizing cylinder; 66. Water distribution port; 67. Cylinder bottom plate; 68. Concentrator; 81. First reflux pump; 91. Second reflux pump. DETAILED DESCRIPTION

[0057] The present invention provides an integrated device for deep denitrification of high-ammonia nitrogen wastewater. When in use, the device is connected to an external high-ammonia nitrogen wastewater inlet pipe and a mud discharge pipe. The device has a multi-layered ring structure, which comprises, from the outside to the inside, a denitrification section, a short-cut nitrification section, a short-cut nitrification-anaerobic ammonium oxidation section, and a precipitation section. A first interstage solid-liquid separation section and a second interstage solid-liquid separation section are respectively provided between the denitrification section and the short-cut nitrification section. The short-cut nitrification-anaerobic ammonium oxidation section is connected to the precipitation section via a biochemical reaction zone outlet pipe, and the precipitation section is connected to an external mud discharge pipe.

[0058] The second interstage solid-liquid separation section is connected to the denitrification section via a first reflux component, and the precipitation section is connected to the denitrification section via a second reflux component;

[0059] Among them, the volume ratio of the denitrification section, the short-cut nitrification section and the short-cut nitrification-anaerobic ammonium oxidation section is 1:2-4:1.5-5;

[0060] The denitrification section is used to utilize organic matter in external high-ammonia nitrogen wastewater to remove nitric nitrogen in the return wastewater of the short-cut nitrification-anaerobic ammonium oxidation section, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter on subsequent anaerobic ammonium oxidation and other biochemical processes, and enhancing operational stability;

[0061] The short-cut nitrification section is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0062] The first inter-stage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the short-cut nitrification section and the short-cut nitrification-anaerobic ammonium oxidation section;

[0063] The second inter-stage solid-liquid separation section is used to achieve solid-liquid separation of sewage and divert the sewage to the denitrification section and the short-cut nitrification-anaerobic ammonium oxidation section;

[0064] The short-cut nitrification-anaerobic ammonium oxidation section is used to achieve deep denitrification of sewage;

[0065] The sedimentation section is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0066] In one embodiment of the present invention, the total height of the integrated device is 5 to 8 meters.

[0067] In one embodiment of the present invention, when the concentrations of nitrate nitrogen and COD in the influent of the integrated device are high, it is necessary to increase the volume proportion of the denitrification section; when the concentration of ammonia nitrogen in the influent of the integrated device is high, it is necessary to increase the volume proportion of the short-cut nitrification section and the short-cut nitrification-anaerobic ammonia oxidation section.

[0068] In one embodiment of the present invention, a stirring device is provided in the denitrification section;

[0069] The short-range nitrification section is provided with a stirring device and a first aeration pipe system;

[0070] A first overflow water distribution channel is provided around the top of the first interstage solid-liquid separation section, a first mud slide is provided between the first interstage solid-liquid separation section and the denitrification section, and the first partition plate is connected to the short-range nitrification section;

[0071] A second overflow water distribution channel is provided around the top of the second interstage solid-liquid separation section, a second mud slide is provided between the second interstage solid-liquid separation section and the short-range nitrification section, and the second mud slide is connected to the denitrification section through a second partition plate;

[0072] 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 water outlet pipe of the biochemical reaction zone;

[0073] The top of the sedimentation section is surrounded by water outlet channels, and a flow stabilizing tube, a concentrator and a mud collecting hopper are arranged inside. The flow stabilizing tube is arranged in the middle position in the height direction of the sedimentation section and is connected to the water outlet pipe of the biochemical reaction area. The top of the concentrator passes through the flow stabilizing tube and extends out to the top of the sedimentation section to be connected to the external mixer. The mud collecting hopper is arranged at the bottom of the sedimentation section and is connected to the external mud discharge pipe.

[0074] In one embodiment of the present invention, the second overflow water distribution channel is connected to the denitrification section via a first reflux component;

[0075] The first reflux component includes a first reflux pipe and a first reflux pump. The second overflow water distribution channel is connected to the first reflux pump through the first reflux pipe. The first reflux pump is connected to the denitrification section through the first reflux pipe.

[0076] In one embodiment of the present invention, the bottom end of the first mud slide is higher than the bottom surface of the first inter-stage solid-liquid separation section, and the top end is higher than the lower bottom surface of the first overflow water distribution channel;

[0077] The bottom end of the second mud slide is higher than 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;

[0078] The bottom end of the first partition plate is connected to the bottom surface of the first interstage solid-liquid separation section, and the top end is higher than the bottom surface of the first overflow distribution channel;

[0079] 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 bottom surface of the second overflow distribution channel;

[0080] The lower bottom surface of the first overflow water distribution channel is higher than the lower bottom surface of the second overflow water distribution channel;

[0081] The angle between the first mud slide and the bottom end of the first partition plate is 40 to 120 degrees;

[0082] The included angle between the second mud slide and the bottom end of the second partition plate is 40 to 120 degrees.

[0083] In one embodiment of the present invention, the corridor partition is semicircular, including a first corridor partition and a second corridor partition with opposite inner arcs and concentrically arranged, the radius of the first corridor partition is 70% to 85% of the radius of the shortcut nitrification-anaerobic ammonium oxidation section, and the radius of the second corridor partition is 45% to 60% of the radius of the shortcut nitrification-anaerobic ammonium oxidation section;

[0084] 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 type and fixed type, and the filling rate is 40% to 60%.

[0085] In one embodiment of the present invention, a water distribution port is provided on the bottom plate of the flow stabilizing tube;

[0086] 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 the flow stabilizing cylinder and extends out of the top of the sedimentation section to be connected to an external mixer.

[0087] 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 distance between the water outlet channel and the top of the integrated device is 300 to 900 mm, and the water outlet trough is 200 to 500 mm lower than the water outlet channel;

[0088] The outlet trough is connected to the denitrification section through a second reflux component to remove nitric nitrogen produced by the anaerobic ammonium oxidation process and enhance the total nitrogen removal rate; the second reflux component includes a second reflux pipe and a second reflux pump, the outlet trough is connected to the second reflux pump through the second reflux pipe, and the second reflux pump is connected to the denitrification section through the second reflux pipe.

[0089] The present invention provides a treatment method for deep denitrification of high-ammonia nitrogen wastewater, based on the above-mentioned integrated device for deep denitrification of high-ammonia nitrogen wastewater, specifically comprising the following steps:

[0090] (S1) The high-ammonia nitrogen wastewater enters the denitrification section to remove nitrate nitrogen and consume organic matter in the high-ammonia nitrogen wastewater to obtain primary treated wastewater;

[0091] (S2) a portion of the primary treated wastewater passes through the first interstage solid-liquid separation section and enters the short-cut nitrification section, where part of the ammonia nitrogen is converted into nitrite nitrogen to obtain secondary treated wastewater; another portion of the primary treated wastewater passes through the first interstage solid-liquid separation section and enters the short-cut nitrification-anaerobic ammonium oxidation section;

[0092] (S3) a portion of the secondary treated wastewater is returned to the denitrification section, and another portion of the secondary treated wastewater passes through the second interstage solid-liquid separation section and enters the short-cut nitrification-anaerobic ammonium oxidation section to achieve simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining tertiary treated wastewater;

[0093] (S4) The tertiary treated wastewater enters the sedimentation section to obtain sludge and effluent from the integrated device. The sludge is discharged directly, and part of the effluent from the integrated device is returned to the denitrification section, and the other part is discharged directly.

[0094] 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;

[0095] The surface load of the second interstage solid-liquid separation section is 0.6 to 2.0 m 3 / m 2 / h;

[0096] The surface load of the sedimentation section is 1.5 to 2.0 m3 / m 2 / h;

[0097] The dissolved oxygen concentration in the short-range nitrification section is 0.5-0.8 mg / L;

[0098] The dissolved oxygen concentration in the short-range nitrification-anaerobic ammonium oxidation section is 0.1-0.3 mg / L.

[0099] In one embodiment of the present invention, the stirring speed of the stirring device is set in the range of 50 to 500 r / min; the volume load of the device during 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.

[0100] In one embodiment of the present invention, the return flow of the secondary treated sewage accounts for 30% to 70% of the primary treated sewage entering the short-cut nitrification section; the return flow of the effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

[0101] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0102] The model, size (diameter), specifications of related equipment and other parameters of the integrated device in the following embodiment are only a specific description; in actual application, they can be adjusted according to the water quality and water volume of the high-ammonia nitrogen wastewater to be treated.

[0103] 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.

[0104] Example 1

[0105] This embodiment provides an integrated device for deep denitrification of high-ammonia nitrogen wastewater.

[0106] like Figure 1 and Figure 2 As shown, an integrated device for deep denitrification of high-ammonia nitrogen wastewater is a multi-layered annular structure, including a central cylindrical sedimentation section 60, a shortcut nitrification-anaerobic ammonium oxidation section 30 surrounding the sedimentation section 60, a denitrification section 10 surrounding the shortcut nitrification-anaerobic ammonium oxidation section 30, and a shortcut nitrification section 20;

[0107] The total height of the integrated device is 6 meters, and the volume ratio of the denitrification section 10, the shortcut nitrification section 20, and the shortcut nitrification-anaerobic ammonium oxidation section 30 is 1:4:2;

[0108] The denitrification section 10 is provided with a stirring device 70, and the short-cut nitrification section 20 is provided with a stirring device 70 and a first aeration pipe system 21; a first interstage solid-liquid separation section 40 and a second interstage solid-liquid separation section 50 are respectively provided between the denitrification section 10 and the short-cut nitrification section 20, 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 denitrification section 10, and a first mud slide 42 is provided between the short-cut nitrification section 2 0 are connected by the first partition plate 43, the bottom end of the first sliding mud plate 42 is higher than the bottom surface of the first interstage 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 first partition plate 43 is connected to the bottom surface of the first interstage solid-liquid separation section 40, and the top end is higher than the bottom surface of the first overflow water distribution channel 41. The angle between the first sliding mud plate 42 and the bottom end of the first partition plate 43 is 80°; the top of the second interstage solid-liquid separation section 50 is surrounded by a second overflow water distribution channel. A second mud slide 52 is provided between the second interstage solid-liquid separation section 50 and the short-range nitrification section 20, and is connected to the denitrification section 10 via a second partition plate 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 bottom surface of the second overflow water distribution channel 51; the bottom end of the second partition plate 53 is connected to the bottom surface of the second interstage solid-liquid separation section 50, and the top end is higher than the bottom surface of the second overflow water distribution channel 51; the second overflow water distribution channel The lower bottom surface of 51 is lower than the lower bottom surface of the first overflow water distribution channel 41; the angle between the second mud slide 52 and the bottom end of the second partition partition 53 is 80°; the second overflow water distribution channel 51 is also connected to the denitrification section 10 through the first reflux component 80, the first reflux component 80 includes a first reflux pipe and a first reflux pump 81, the second overflow water distribution channel 51 is connected to the first reflux pump 81 through the first reflux pipe, and the first reflux pump 81 is connected to the denitrification section 10 through the first reflux pipe.

[0109] The short-range nitrification-anaerobic ammonium oxidation section 30 is internally provided with a semicircular gallery partition 31, a biological carrier 34, a second aeration pipe system 33 and a submersible flow propeller 32, and is connected to the sedimentation section 60 through the biochemical reaction zone outlet pipe 35; 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, which is deployed in a fixed manner and has a filling rate of 50%; the short-range nitrification-anaerobic ammonium oxidation section 30 is connected to the sedimentation section 60 through the biochemical reaction zone outlet pipe 35.

[0110] The top of the sedimentation section 60 is provided with an outlet channel 62. A water outlet trough 63 is provided below the side of the outlet channel 62 away from the mud collecting bucket 61. The distance between the 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 outlet channel 62. The sedimentation section 60 is provided with a flow stabilizing cylinder 65, a concentrator 68 and a mud collecting bucket 61. The flow stabilizing cylinder 65 is provided in the middle position of 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 provided 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 connect with the external mixer. connected; the mud collecting hopper 61 is arranged at the bottom of the sedimentation section 60 and is connected to the external mud discharge pipe 64; the water outlet trough 63 is connected to the denitrification section 10 through the second reflux component 90 to remove nitric nitrogen produced by the anaerobic ammonia oxidation process and enhance the total nitrogen removal rate; the second reflux component 90 includes a second reflux pipe and a second reflux pump 91, the water outlet trough 63 is connected to the second reflux pump 91 through the second reflux pipe, and the second reflux pump 91 is connected to the denitrification section 10 through the second reflux pipe.

[0111] The denitrification section 10 is used to utilize organic matter in the external high-ammonia nitrogen wastewater to remove nitrate nitrogen from the return wastewater of the short-cut nitrification-anaerobic ammonium oxidation section 30, thereby enhancing the total nitrogen removal rate, reducing the interference of organic matter on subsequent anaerobic ammonium oxidation and other biochemical processes, and improving operational stability.

[0112] The short-cut nitrification section 20 is used to convert part of the ammonia nitrogen into nitrite nitrogen;

[0113] The first inter-stage solid-liquid separation section 40 is used to achieve solid-liquid separation of the sewage and divert the sewage to the short-cut nitrification section 20 and the short-cut nitrification-anaerobic ammonium oxidation section 30;

[0114] The second inter-stage 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 shortcut nitrification-anaerobic ammonium oxidation section 30;

[0115] The short-cut nitrification-anaerobic ammonium oxidation section 30 is used to achieve deep denitrification of sewage;

[0116] The sedimentation section 60 is used to achieve solid-liquid separation and reduce the solid content of the effluent from the integrated device.

[0117] Example 2

[0118] 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:

[0119] (S1) The high-ammonia nitrogen wastewater enters the denitrification section 10 to remove nitrate nitrogen and consume organic matter in the high-ammonia nitrogen wastewater (on the one hand, strengthening the removal of nitrate nitrogen, on the other hand, reducing the interference of organic matter with subsequent biochemical processes such as anaerobic ammonium oxidation, and enhancing operational stability), thereby obtaining primary treated wastewater;

[0120] The rotation speed of the stirring device 70 in the denitrification section 10 is 200 r / min;

[0121] (S2) A portion of the primary treated wastewater passes through the first interstage solid-liquid separation section 40 and enters the short-cut nitrification section 20, where part of the ammonia nitrogen is converted into nitrite nitrogen to obtain secondary treated wastewater; another portion of the primary treated wastewater passes through the first interstage solid-liquid separation section 40 and enters the short-cut nitrification-anaerobic ammonium oxidation section 30 (to replenish and adjust the ammonia nitrogen / nitrite nitrogen concentration ratio and enhance the denitrification efficiency and stability of the anaerobic ammonium oxidation process);

[0122] The speed of the stirring device 70 in the short-range nitrification section 20 is 200 r / min, the dissolved oxygen concentration is 0.5-0.8 mg / L; the surface load of the first inter-stage solid-liquid separation section 40 is 1.0 m 3 / m 2 / h;

[0123] (S3) A portion of the secondary treated wastewater is returned to the denitrification section 10, and another portion of the secondary treated wastewater passes through the second interstage solid-liquid separation section 50 and enters the short-cut nitrification-anaerobic ammonium oxidation section 30 to achieve simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining tertiary treated wastewater;

[0124] The flow velocity of the submerged flow propeller 32 in the short-cut nitrification-anaerobic ammonium oxidation section 30 is 0.2 m / s, and the dissolved oxygen concentration is 0.1-0.3 mg / L; the return flow of the secondary treated sewage accounts for 40% of the primary treated sewage entering the short-cut nitrification section 20; the surface load of the second interstage solid-liquid separation section 50 is 1.0 m 3 / m 2 / h;

[0125] (S4) The tertiary treated wastewater enters the sedimentation section 60, producing sludge and integrated device effluent. The sludge is directly discharged, and a portion of the integrated device effluent is returned to the denitrification section 10 (to utilize organic matter in the high-ammonia nitrogen wastewater influent to remove nitrate nitrogen byproducts produced by anaerobic ammonium oxidation, thereby enhancing the total nitrogen removal rate of the integrated device and improving the effluent quality), while the remaining portion is directly discharged;

[0126] The surface load of the sedimentation section 60 is 1.5m 3 / m 2 / h, and the reflux rate is 50% of the water output from the integrated device.

[0127] The volumetric load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 2.0kgBOD5 / m 3 / d.

[0128] Example 3

[0129] This embodiment provides an integrated device for deep denitrification of high-ammonia nitrogen wastewater.

[0130] Compared with Example 1, this embodiment has the following differences: the volume ratio of the denitrification section 10, the short-cut nitrification section 20 and the short-cut nitrification-anaerobic ammonium oxidation section 30 is 1:4:3, the surface load of the first interstage solid-liquid separation section 40 and the second interstage solid-liquid separation section 50 is 1.5m 3 / m 2 / h, the volumetric load of the integrated device for denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 3.0kgBOD5 / m 3 / d, the installation angle between the first mud slide 42 and the first partition partition 43, and the installation angle between the second mud slide 52 and the second partition partition 53 is 70°, the flow velocity of the submersible flow propeller 32 is 0.4 m / s, the biological carrier 34 is a hollow suspended filler with a filling rate of 50%, and the carrier delivery form is fluidized. Others are the same as in Example 1.

[0131] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the explanations 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 high-ammonia nitrogen wastewater, which is connected to an external high-ammonia nitrogen wastewater inlet pipe and a mud discharge pipe (64) when in use, and is characterized in that: The integrated device is a multi-layered ring structure, which comprises, from the outside to the inside, a denitrification section (10), a short-range nitrification section (20), a short-range nitrification-anaerobic ammonium oxidation section (30), and a precipitation section (60). The denitrification section (10) is connected to an external high-ammonia nitrogen sewage inlet pipe; a first interstage solid-liquid separation section (40) and a second interstage solid-liquid separation section (50) are respectively provided between the denitrification section (10) and the short-cut nitrification section (20); the first interstage solid-liquid separation section (40) is used to achieve solid-liquid separation of sewage and divert the sewage to the short-cut nitrification section (20) and the short-cut nitrification-anaerobic ammonium oxidation section (30); the second interstage solid-liquid separation section (50) is used to achieve solid-liquid separation of sewage and divert the sewage to the denitrification section (10) and the short-cut nitrification-anaerobic ammonium oxidation section (30); the short-cut nitrification-anaerobic ammonium 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 the external mud discharge pipe (64); The second interstage solid-liquid separation section (50) is connected to the denitrification section (10) via a first reflux component (80), and the sedimentation section (60) is connected to the denitrification section (10) via a second reflux component (90); Among them, the volume ratio of the denitrification section (10), the short-cut nitrification section (20), and the short-cut nitrification-anaerobic ammonium oxidation section (30) is 1:2~4:1.5~5; The short-cut nitrification-anaerobic ammonium oxidation section (30) is provided with a gallery partition (31), a biological carrier (34), a second aeration pipe system (33) and a submersible flow propeller (32). The short-cut nitrification-anaerobic ammonium oxidation section (30) is connected to the sedimentation section (60) via a biochemical reaction zone outlet pipe (35); The corridor partition (31) is semicircular and includes a first corridor partition and a second corridor partition that are opposite to each other and concentrically arranged. The radius of the first corridor partition is 70% to 85% of the radius of the short-range nitrification-anaerobic ammonium oxidation section (30), and the radius of the second corridor 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.

2. The integrated device for deep denitrification of high-ammonia nitrogen 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 first overflow water distribution channel (41) is provided around the top of the first inter-stage solid-liquid separation section (40), a first mud slide (42) is provided between the first inter-stage solid-liquid separation section (40) and the denitrification section (10), and the first inter-stage solid-liquid separation section (40) is connected to the short-range nitrification section (20) via a first partition plate (43); A second overflow water distribution channel (51) is provided around the top of the second interstage solid-liquid separation section (50); a second mud slide (52) is provided between the second interstage solid-liquid separation section (50) and the short-range nitrification section (20); the second interstage solid-liquid separation section (50) and the denitrification section (10) are connected via a second partition plate (53); and the second overflow water distribution channel (51) is connected to the denitrification section (10) via a first reflux component (80).

3. The integrated device for deep denitrification of high-ammonia nitrogen 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 interstage 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 partition plate (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 distribution channel (41); The bottom end of the second partition plate (53) is connected to the bottom surface of the second interstage solid-liquid separation section (50), and the top end is higher than the bottom surface of the second overflow distribution channel (51).

4. The integrated device for deep denitrification of high-ammonia nitrogen wastewater according to claim 2, characterized in that: The lower bottom surface of the first overflow water distribution channel (41) is higher than the lower bottom surface of the second overflow water distribution channel (51); The angle between the bottom ends of the first mud slide (42) and the first partition 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°.

5. The integrated device for deep denitrification of high-ammonia nitrogen wastewater according to claim 1, characterized in that: The top of the sedimentation section (60) is provided with an outlet channel (62) around it. The interior of the sedimentation section (60) is provided with a flow stabilizing tube (65), a concentrator (68) and a mud collecting hopper (61). The flow stabilizing tube (65) is provided 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 top of the concentrator (68) passes through the flow stabilizing tube (65) and extends out of the top of the sedimentation section (60). The mud collecting hopper (61) is provided at the bottom of the sedimentation section (60) and is connected to the external mud discharge pipe (64).

6. The integrated device for deep denitrification of high-ammonia nitrogen wastewater according to claim 5, characterized in that: A water outlet trough (63) is provided 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); The water outlet trough (63) is connected to the denitrification section (10) via a second reflux component (90).

7. A treatment method for deep denitrification of high ammonia nitrogen wastewater, characterized in that: The integrated device for deep denitrification of high-ammonia nitrogen wastewater according to any one of claims 1 to 6 specifically comprises the following steps: (S1) The high-ammonia nitrogen wastewater enters the denitrification section (10) to remove nitrate nitrogen and consume organic matter in the high-ammonia nitrogen wastewater to obtain primary treated wastewater; (S2) a portion of the primary treated sewage passes through the first interstage solid-liquid separation section (40) and enters the short-cut nitrification section (20), where part of the ammonia nitrogen is converted into nitrite nitrogen to obtain secondary treated sewage; another portion of the primary treated sewage passes through the first interstage solid-liquid separation section (40) and enters the short-cut nitrification-anaerobic ammonium oxidation section (30); (S3) A portion of the secondary treated wastewater is returned to the denitrification section (10), and another portion of the secondary treated wastewater enters the short-cut nitrification-anaerobic ammonium oxidation section (30) through the second interstage solid-liquid separation section (50), achieving simultaneous removal of ammonia nitrogen and nitrite nitrogen, thereby obtaining tertiary treated wastewater; (S4) The tertiary treated wastewater enters the sedimentation section (60) to obtain sludge and effluent from the integrated device. The sludge is discharged directly, and part of the effluent from the integrated device is returned to the denitrification section (10), and the other part is discharged directly.

8. A method for deep denitrification of high ammonia nitrogen wastewater according to claim 7, characterized in that: The surface load of the first interstage solid-liquid separation section (40) is 0.6~2.0 m 3 / m 2 / h; The surface load of the second interstage solid-liquid separation section (50) is 0.6~2.0 m 3 / m 2 / h; The surface load of the sedimentation section (60) is 1.5~2.0 m 3 / m 2 / h; The dissolved oxygen concentration in the short-range nitrification section (20) was 0.5–0.8 mg / L; The dissolved oxygen concentration in the short-cut nitrification-anaerobic ammonium oxidation section (30) is 0.1~0.3 mg / L.

9. A method for deep denitrification of high-ammonia nitrogen wastewater according to claim 7, characterized in that: The return flow of secondary treated wastewater accounts for 30% to 70% of the primary treated wastewater entering the short-cut nitrification section (20); the return flow of the effluent from the integrated device accounts for 20% to 70% of the effluent from the integrated device.

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