Integrated treatment device and treatment method for deep denitrification of high-ammonia nitrogen wastewater

Abstract

The present invention relates to the field of sewage treatment technology, and in particular to an integrated treatment device for deep denitrification of high-ammonia nitrogen sewage and a treatment method thereof. In the integrated treatment device for deep denitrification of high-ammonia nitrogen sewage of the present invention, each reaction zone is tightly integrated in the vertical space, resulting in low head loss and a small footprint. Through the coordinated use of multiple stages and multiple biochemical processes, the device overcomes the shortcomings of traditional biochemical technologies for treating high-ammonia nitrogen sewage, such as low denitrification efficiency, poor operational stability, large footprint, and numerous individual structures. The device has denitrification-short-range nitrification-anaerobic ammonia oxidation functions, and has the advantages of high denitrification efficiency, stable operation, high integration, and a small footprint.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an integrated treatment device and a treatment method for deep denitrification of high-ammonia nitrogen sewage. 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 treatment device for deep denitrification of high-ammonia nitrogen wastewater and a treatment method thereof. In the integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater of the present invention, each reaction zone is closely integrated in the vertical space, with low head loss and small footprint. Through the coordination of multi-stage and multi-biochemical processes, it overcomes the shortcomings of low denitrification efficiency, poor operational stability, large footprint, and multiple single structures when treating high-ammonia nitrogen wastewater with traditional biochemical technology; it has denitrification-short-range nitrification-anaerobic ammonia 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 treatment device for deep denitrification of high-ammonia nitrogen wastewater, which is connected to an external high-ammonia nitrogen wastewater inlet pipe when in use. The integrated treatment device has a multi-layer tower structure, is supported by a reactor base, and operates in an upflow mode when in use. From the bottom to the top, it comprises a reflux water distribution zone, an anaerobic ammonium oxidation zone, an inlet water distribution zone, a denitrification zone, a shortcut nitrification zone, and a nitrification zone.

[0006] The water inlet and distribution area is connected to the external high-ammonia nitrogen sewage inlet pipe, the short-range nitrification area is connected to the water inlet and distribution area through the first reflux component, the short-range nitrification area is connected to the reflux distribution area through the second reflux component, and the denitrification area is connected to the reflux distribution area through the third reflux component. A water outlet area and an exhaust port are provided on the top of the nitrification area.

[0007] In one embodiment of the present invention, the cross section of the integrated processing device is circular, and the aspect ratio is 3-10.

[0008] In one embodiment of the present invention, the volume ratio of the return water distribution zone, the anaerobic ammonium oxidation zone, the inlet water distribution zone, the denitrification zone, the shortcut nitrification zone and the nitrification zone is 1: (6-9): (2-3): (4-6): (6-9): (2-3);

[0009] The actual volume ratio is adjusted according to the concentrations of nitrate nitrogen, COD and ammonia nitrogen in the influent of the device. When the concentrations of nitrate nitrogen and COD in the influent of the device are high, the volume ratio of the denitrification zone should be appropriately increased. When the concentration of ammonia nitrogen is high, the volume ratio of the short-range nitrification zone and the anaerobic ammonia oxidation zone should be appropriately increased.

[0010] In one embodiment of the present invention, a first biological carrier is provided inside the anaerobic ammonium oxidation zone;

[0011] A stirrer is provided inside the water inlet and distribution area;

[0012] A second biological carrier is provided inside the denitrification zone;

[0013] The short-range nitrification zone is provided with an aeration pipe system and a third biological carrier;

[0014] A fourth biological carrier is arranged inside the nitrification zone, and an exhaust port is arranged on the top.

[0015] In one embodiment of the present invention, a first supporting orifice plate is provided at the junction of the return water distribution zone and the anaerobic ammonium oxidation zone, a second supporting orifice plate is provided at the junction of the anaerobic ammonium oxidation zone and the inlet water distribution zone, a third supporting orifice plate is provided at the junction of the inlet water distribution zone and the denitrification zone, a fourth supporting orifice plate is provided at the junction of the denitrification zone and the shortcut nitrification zone, and a fifth supporting orifice plate is provided at the junction of the shortcut nitrification zone and the nitrification zone;

[0016] The first supporting orifice plate, the second supporting orifice plate, the third supporting orifice plate, the fourth supporting orifice plate and the fifth supporting orifice plate are all provided with a plurality of flow holes with an aperture of 2 to 10 mm; the flow rate of the flow holes is 10 to 100 mm / s.

[0017] In one embodiment of the present invention, 2 to 4 agitators are arranged in a mirror-symmetrical manner along the tangential direction of the inner wall of the device in the water inlet and distribution area.

[0018] In one embodiment of the present invention, the aeration tube is selected from a microporous aerator, an aeration disk or a tubular aerator.

[0019] In one embodiment of the present invention, the first biocarrier, the second biocarrier, the third biocarrier, and the fourth biocarrier are independently selected from one of a biorope, a hollow suspended filler, and a polyurethane foam;

[0020] The filling rates of the first biological carrier, the second biological carrier, the third biological carrier and the fourth biological carrier are independently 40% to 60%; and the delivery form is one of fluidized type and fixed type.

[0021] In one embodiment of the present invention, the water outlet area includes an overflow, an outlet channel, and a water outlet;

[0022] The overflow port is arranged on the top side wall of the nitrification zone, the outlet channel is arranged along the bottom of the overflow port, and the outlet port is arranged at the bottom of the outlet channel;

[0023] The distance between the water outlet and the overflow port is 300 to 900 mm.

[0024] 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 treatment device for deep denitrification of high-ammonia nitrogen wastewater, which specifically includes the following steps:

[0025] (S1) High-ammonia nitrogen wastewater enters the water distribution area, is mixed, and then flows upward into the denitrification area, where nitrate nitrogen in the high-ammonia nitrogen wastewater is removed and organic matter in the high-ammonia nitrogen wastewater is consumed to obtain treated wastewater in the denitrification area;

[0026] (S2) a portion of the wastewater treated in the denitrification zone flows upward into the short-range nitrification zone, and another portion of the wastewater treated in the denitrification zone flows back to the return water distribution zone;

[0027] (S3) After the wastewater treated in the denitrification zone enters the short-cut nitrification zone, part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining wastewater treated in the short-cut nitrification zone;

[0028] (S4) a portion of the wastewater treated in the shortcut nitrification zone flows upward into the nitrification zone, a portion of the wastewater treated in the shortcut nitrification zone flows back to the inlet distribution area, and another portion of the wastewater treated in the shortcut nitrification zone flows back to the return distribution area;

[0029] (S5) After the wastewater treated in the short-cut nitrification zone enters the nitrification zone, a nitrification reaction is carried out to obtain effluent from the device, ensuring that the nitrite nitrogen concentration in the effluent meets the standard and reducing the ecological risk of the effluent discharge;

[0030] (S6) The effluent from a portion of the devices is directly discharged, and the effluent from the other portion of the devices is returned to the return water distribution area;

[0031] Among them, the denitrification zone treated sewage in the return water distribution area and the short-range nitrification zone treated sewage are mixed and flow upward to the anaerobic ammonium oxidation zone to obtain anaerobic ammonium oxidation treated sewage, which then flows upward to the water inlet distribution area.

[0032] In one embodiment of the present invention, the dissolved oxygen concentration in the short-range nitrification section is 0.5 to 0.8 mg / L;

[0033] The dissolved oxygen concentration in the anaerobic ammonium oxidation section is lower than 0.2 mg / L.

[0034] In one embodiment of the present invention, the stirring speed of the stirrer 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.

[0035] In one embodiment of the present invention, the return flow rate of the wastewater treated in the denitrification zone is 10% to 50% of the wastewater treated in the denitrification zone;

[0036] The return volume of the sewage treated in the short-cut nitrification zone to the water inlet distribution zone is 5% to 20% of the sewage treated in the short-cut nitrification zone, and the return volume to the return water distribution zone is 60% to 80% of the sewage treated in the short-cut nitrification zone.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater of the present invention adopts 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.

[0039] (2) The integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater of the present invention has a denitrification section for strengthening the removal of nitrate nitrogen and organic matter. On the one hand, it strengthens 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.

[0040] (3) The integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater of the present invention adopts a short-range nitrification in series with an 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.

[0041] (4) The vertical arrangement of the reaction zones in the integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater of the present invention creates a minimal footprint, a high level of integration, a neatly designed device, and high space utilization. Most of the motors involved in the reaction are located outside the device, making maintenance easy. The device achieves a close integration of the reaction zones in three-dimensional space, significantly increasing the wastewater treatment capacity per unit volume compared to conventional processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a front cross-sectional view of an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater provided by the present invention;

[0043] Figure 2 A top-down cross-sectional view of the water inlet and distribution area of ​​an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater provided by the present invention;

[0044] Numbers in the figure: 10. Reflux distribution area; 20. Anaerobic ammonia oxidation area; 30. Inlet distribution area; 40. Denitrification area; 50. Short-range nitrification area; 60. Nitrification area; 70. Outlet area; 80. Exhaust port; 90. First reflux component; 100. Second reflux component; 110. Third reflux component; 120. Reactor base; 21. First support orifice plate; 22. First biological carrier; 31. Second support orifice plate; 32. Agitator; 41. Third support orifice plate; 42. Second biological carrier; 51. Fourth support orifice plate; 52. Aeration pipe system; 53. Third biological carrier; 61. Fifth support orifice plate; 62. Fourth biological carrier; 71. Overflow port; 72. Outlet channel; 73. Outlet; 91. First reflux pump; 101. Second reflux pump; 111. Third reflux pump. DETAILED DESCRIPTION

[0045] The present invention provides an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater. When in use, it is connected to an external high-ammonia nitrogen wastewater inlet pipe. The integrated treatment device has a multi-layer tower structure, is supported by a reactor base, and operates in an upflow mode. From the bottom to the top, it comprises a reflux water distribution zone, an anaerobic ammonium oxidation zone, an inlet water distribution zone, a denitrification zone, a short-cut nitrification zone, and a nitrification zone.

[0046] The water inlet and distribution area is connected to the external high-ammonia nitrogen sewage inlet pipe, the short-range nitrification area is connected to the water inlet and distribution area through the first reflux component, the short-range nitrification area is connected to the reflux distribution area through the second reflux component, and the denitrification area is connected to the reflux distribution area through the third reflux component. A water outlet area and an exhaust port are provided on the top of the nitrification area.

[0047] In one embodiment of the present invention, the cross section of the integrated processing device is circular, and the aspect ratio is 3-10.

[0048] In one embodiment of the present invention, the volume ratio of the return water distribution zone, the anaerobic ammonium oxidation zone, the inlet water distribution zone, the denitrification zone, the shortcut nitrification zone and the nitrification zone is 1: (6-9): (2-3): (4-6): (6-9): (2-3);

[0049] The actual volume ratio is adjusted according to the concentrations of nitrate nitrogen, COD and ammonia nitrogen in the influent of the device. When the concentrations of nitrate nitrogen and COD in the influent of the device are high, the volume ratio of the denitrification zone should be appropriately increased. When the concentration of ammonia nitrogen is high, the volume ratio of the short-range nitrification zone and the anaerobic ammonia oxidation zone should be appropriately increased.

[0050] In one embodiment of the present invention, a first biological carrier is provided inside the anaerobic ammonium oxidation zone;

[0051] A stirrer is provided inside the water inlet and distribution area;

[0052] A second biological carrier is provided inside the denitrification zone;

[0053] The short-range nitrification zone is provided with an aeration pipe system and a third biological carrier;

[0054] A fourth biological carrier is arranged inside the nitrification zone, and an exhaust port is arranged on the top.

[0055] In one embodiment of the present invention, a first supporting orifice plate is provided at the junction of the return water distribution zone and the anaerobic ammonium oxidation zone, a second supporting orifice plate is provided at the junction of the anaerobic ammonium oxidation zone and the inlet water distribution zone, a third supporting orifice plate is provided at the junction of the inlet water distribution zone and the denitrification zone, a fourth supporting orifice plate is provided at the junction of the denitrification zone and the shortcut nitrification zone, and a fifth supporting orifice plate is provided at the junction of the shortcut nitrification zone and the nitrification zone;

[0056] The first supporting orifice plate, the second supporting orifice plate, the third supporting orifice plate, the fourth supporting orifice plate and the fifth supporting orifice plate are all provided with a plurality of flow holes with an aperture of 2 to 10 mm; the flow rate of the flow holes is 10 to 100 mm / s.

[0057] In one embodiment of the present invention, 2 to 4 agitators are arranged in a mirror-symmetrical manner along the tangential direction of the inner wall of the device in the water inlet and distribution area.

[0058] In one embodiment of the present invention, the aeration tube is selected from a microporous aerator, an aeration disk or a tubular aerator.

[0059] In one embodiment of the present invention, the first biocarrier, the second biocarrier, the third biocarrier, and the fourth biocarrier are independently selected from one of a biorope, a hollow suspended filler, and a polyurethane foam;

[0060] The filling rates of the first biological carrier, the second biological carrier, the third biological carrier and the fourth biological carrier are independently 40% to 60%; and the delivery form is one of fluidized type and fixed type.

[0061] In one embodiment of the present invention, the water outlet area includes an overflow, an outlet channel, and a water outlet;

[0062] The overflow port is arranged on the top side wall of the nitrification zone, the outlet channel is arranged along the bottom of the overflow port, and the outlet port is arranged at the bottom of the outlet channel;

[0063] The distance between the water outlet and the overflow port is 300 to 900 mm.

[0064] The present invention provides a treatment method for deep denitrification of high-ammonia nitrogen wastewater, based on the above-mentioned integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater, which specifically includes the following steps:

[0065] (S1) High-ammonia nitrogen wastewater enters the water distribution area, is mixed, and then flows upward into the denitrification area, where nitrate nitrogen in the high-ammonia nitrogen wastewater is removed and organic matter in the high-ammonia nitrogen wastewater is consumed to obtain treated wastewater in the denitrification area;

[0066] (S2) a portion of the wastewater treated in the denitrification zone flows upward into the short-range nitrification zone, and another portion of the wastewater treated in the denitrification zone flows back to the return water distribution zone;

[0067] (S3) After the wastewater treated in the denitrification zone enters the short-cut nitrification zone, part of the ammonia nitrogen is converted into nitrite nitrogen, thereby obtaining wastewater treated in the short-cut nitrification zone;

[0068] (S4) a portion of the wastewater treated in the shortcut nitrification zone flows upward into the nitrification zone, a portion of the wastewater treated in the shortcut nitrification zone flows back to the inlet distribution area, and another portion of the wastewater treated in the shortcut nitrification zone flows back to the return distribution area;

[0069] (S5) After the wastewater treated in the short-cut nitrification zone enters the nitrification zone, a nitrification reaction is carried out to obtain effluent from the device, ensuring that the nitrite nitrogen concentration in the effluent meets the standard and reducing the ecological risk of the effluent discharge;

[0070] (S6) The effluent from a portion of the devices is directly discharged, and the effluent from the other portion of the devices is returned to the return water distribution area;

[0071] Among them, the denitrification zone treated sewage in the return water distribution area and the short-range nitrification zone treated sewage are mixed and flow upward to the anaerobic ammonium oxidation zone to obtain anaerobic ammonium oxidation treated sewage, which then flows upward to the water inlet distribution area.

[0072] In one embodiment of the present invention, the dissolved oxygen concentration in the short-range nitrification section is 0.5 to 0.8 mg / L;

[0073] The dissolved oxygen concentration in the anaerobic ammonium oxidation section is lower than 0.2 mg / L.

[0074] In one embodiment of the present invention, the stirring speed of the stirrer 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.

[0075] In one embodiment of the present invention, the return flow rate of the wastewater treated in the denitrification zone is 10% to 50% of the wastewater treated in the denitrification zone;

[0076] The return volume of the sewage treated in the short-cut nitrification zone to the water inlet distribution zone is 5% to 20% of the sewage treated in the short-cut nitrification zone, and the return volume to the return water distribution zone is 60% to 80% of the sewage treated in the short-cut nitrification zone.

[0077] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0078] 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.

[0079] 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.

[0080] Example 1

[0081] This embodiment provides an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater.

[0082] like Figure 1 and Figure 2 As shown, an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater is a multi-layer tower structure. The cross-section of the integrated treatment device is circular, and the height-to-diameter ratio is 3 to 10. The reactor base is used as a support, and a return water distribution zone 10, an anaerobic ammonium oxidation zone 20, an inlet water distribution zone 30, a denitrification zone 40, a shortcut nitrification zone 50, and a nitrification zone 60 are sequentially arranged from bottom to top. The volume ratio of the return water distribution zone 10, the anaerobic ammonium oxidation zone 20, the inlet water distribution zone 30, the denitrification zone 40, the shortcut nitrification zone 50, and the nitrification zone 60 is 1:6:2:4:6:2.

[0083] A first supporting orifice plate 21 is provided at the junction of the return water distribution zone 10 and the anaerobic ammonium oxidation zone 20, a second supporting orifice plate 31 is provided at the junction of the anaerobic ammonium oxidation zone 20 and the water inlet distribution zone 30, a third supporting orifice plate 41 is provided at the junction of the water inlet distribution zone 30 and the denitrification zone 40, a fourth supporting orifice plate 51 is provided at the junction of the denitrification zone 40 and the shortcut nitrification zone 50, and a fifth supporting orifice plate 61 is provided at the junction of the shortcut nitrification zone 50 and the nitrification zone 60; wherein, a plurality of flow holes with a pore size of 2 mm are arranged on the first supporting orifice plate 21, the second supporting orifice plate 31, the third supporting orifice plate 41, the fourth supporting orifice plate 51 and the fifth supporting orifice plate 61;

[0084] The water inlet and distribution area 30 is connected to the external high-ammonia nitrogen sewage inlet pipe. Two agitators 32 are arranged in a mirror-symmetrical manner along the tangential direction of the inner wall of the device in the water inlet and distribution area 30. A first biological carrier 22 is provided in the anaerobic ammonium oxidation area 20; a second biological carrier 42 is provided in the denitrification area 40; an aeration pipe system 52 and a third biological carrier 53 are provided in the short-range nitrification area 50; and a fourth biological carrier 62 is provided in the nitrification area 60.

[0085] The short-range nitrification zone 50 is connected to the water inlet distribution zone 30 through the first reflux component 90, the first reflux component 90 includes a first reflux pump 91 and a first reflux pipe, the short-range nitrification zone 50 is connected to the first reflux pump 91 through the first reflux pipe, and the first reflux pump 91 is connected to the water inlet distribution zone 30 through the first reflux pipe; the short-range nitrification zone 50 is connected to the reflux distribution zone 10 through the second reflux component 100, the second reflux component 100 includes a second reflux pump 101 and a second reflux pipe, the short-range nitrification zone 50 is connected to the second reflux pump 101 through the second reflux pipe, and the second reflux pump 101 is connected to the reflux distribution zone 10 through the second reflux pipe; the denitrification zone 40 is connected to the denitrification zone 40 through the second reflux component 100. The three reflux components 110 are connected to the reflux water distribution area 10. The third reflux component 110 includes a third reflux pump 111 and a third reflux pipe. The denitrification area 40 is connected to the third reflux pump 111 through the third reflux pipe, and the third reflux pump 111 is connected to the reflux water distribution area 10 through the third reflux pipe. The top of the nitrification area 60 is provided with a water outlet area 70 and an exhaust port 80. Among them, the water outlet area 70 includes an overflow port 71, an outlet channel 72 and an outlet 73. The overflow port 71 is provided on the top side wall of the nitrification area 60, the outlet channel 72 is arranged along the bottom of the overflow port 71, and the outlet 73 is provided at the bottom of the outlet channel 72. The distance between the outlet 73 and the overflow port 71 is 300 to 900 mm.

[0086] Furthermore, the aeration pipe system 52 is a microporous aerator; the first biological carrier 22 is a biological rope, the carrier filling rate is 60%, and the delivery form is fixed; the second biological carrier 42 is a biological rope, the carrier filling rate is 50%, and the delivery form is fixed; the third biological carrier 53 is a biological rope, the carrier filling rate is 40%, and the delivery form is fixed; the fourth biological carrier 62 is a biological rope, the carrier filling rate is 60%, and the delivery form is fixed.

[0087] Example 2

[0088] This embodiment provides a treatment method for deep denitrification of high-ammonia nitrogen wastewater.

[0089] (S1) The high-ammonia nitrogen wastewater enters the water inlet distribution area 30, is mixed and then flows upward into the denitrification area 40, where nitrate nitrogen in the high-ammonia nitrogen wastewater is removed and organic matter in the high-ammonia nitrogen wastewater is consumed to obtain denitrification area treated wastewater;

[0090] The stirring speed of the stirrer 32 in the water inlet and water distribution area 30 is 200 r / min;

[0091] (S2) a portion of the wastewater treated in the denitrification zone flows upward into the short-range nitrification zone 50, and another portion of the wastewater treated in the denitrification zone flows back to the return water distribution zone 10;

[0092] Among them, the return flow of wastewater treated in the denitrification area is 20% of the wastewater treated in the denitrification area;

[0093] (S3) After the denitrification zone treated wastewater enters the short-cut nitrification zone 50, part of the ammonia nitrogen is converted into nitrite nitrogen to obtain the short-cut nitrification zone treated wastewater;

[0094] Among them, the dissolved oxygen concentration in the short-range nitrification zone 50 is 0.5-0.8 mg / L;

[0095] (S4) a portion of the wastewater treated in the shortcut nitrification zone flows upward into the nitrification zone 60, a portion of the wastewater treated in the shortcut nitrification zone flows back to the inlet distribution zone 30, and another portion of the wastewater treated in the shortcut nitrification zone flows back to the return distribution zone 10;

[0096] Among them, the return rate of the short-cut nitrification zone treated sewage back to the water inlet distribution area 30 is 10%, and the return rate back to the return water distribution area 10 is 70%;

[0097] (S5) After the wastewater treated in the short-cut nitrification zone enters the nitrification zone 60, a nitrification reaction is carried out (the excess oxygen generated by the aeration pipe system 52 is used to escape upward and then discharged as device effluent through the outlet zone 70 to prevent the nitrite nitrogen concentration in the device effluent from exceeding the standard and ensure the ecological safety of the device effluent), thereby obtaining device effluent;

[0098] (S6) The effluent from a portion of the devices is directly discharged, and the effluent from the other portion of the devices is returned to the reflux water distribution area 10;

[0099] Among them, the denitrification zone treated wastewater in the return water distribution area 10 (to supplement and adjust the ammonia nitrogen / nitrite nitrogen concentration ratio in the short-cut nitrification zone treated wastewater, and further mixed and then enter the anaerobic ammonium oxidation zone 20 to achieve the removal of ammonia nitrogen and nitrite nitrogen) and the short-cut nitrification zone treated wastewater are mixed and flow upward to the anaerobic ammonium oxidation zone 20 to obtain anaerobic ammonium oxidation treated wastewater, which then flows upward to the water inlet distribution area 30 to be mixed with the high-ammonia nitrogen influent and the short-cut nitrification zone treated wastewater, and further enters the denitrification zone 40, where the organic matter in the high-ammonia nitrogen wastewater is used to remove the nitrate nitrogen by-product produced by anaerobic ammonium oxidation, thereby enhancing the total nitrogen removal rate of the device;

[0100] Wherein, the dissolved oxygen concentration in the anaerobic ammonium oxidation zone 20 is less than 0.2 mg / L;

[0101] The volumetric load of the device during denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 3.0-4.0 kgBOD5 / m 3 / d; the through-hole flow rate of the first support orifice plate 21, the second support orifice plate 31, the third support orifice plate 41, the fourth support orifice plate 51 and the fifth support orifice plate 61 is 90 mm / s.

[0102] Example 3

[0103] This embodiment provides an integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater.

[0104] Compared with Example 1, this embodiment has the following differences: the volume ratio of the return water distribution zone 10, the anaerobic ammonium oxidation zone 20, the water inlet distribution zone 30, the denitrification zone 40, the shortcut nitrification zone 50 and the nitrification zone 60 is 1:9:3:6:9:3, and the volume load of the device during denitrification-shortcut nitrification-anaerobic ammonium oxidation biological denitrification is 3.0-5.0 kg BOD5 / m 3 / d, the third biological carrier 53 is a hollow suspended filler with a filling rate of 50%, and the delivery form is fluidized. Other aspects are the same as those of Example 1.

[0105] 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 treatment device for deep denitrification of high-ammonia nitrogen wastewater, which is connected to an external high-ammonia nitrogen wastewater inlet pipe when in use, and is characterized by: The integrated treatment device is a multi-layer tower structure, supported by a reactor base (120), and operates in an upflow mode. From the bottom to the top, it comprises a return water distribution zone (10), an anaerobic ammonium oxidation zone (20), an inlet water distribution zone (30), a denitrification zone (40), a short-cut nitrification zone (50), and a nitrification zone (60); The water inlet distribution area (30) is connected to an external high-ammonia nitrogen sewage inlet pipe, the short-cut nitrification area (50) is connected to the water inlet distribution area (30) via a first reflux component (90), the short-cut nitrification area (50) is connected to the reflux distribution area (10) via a second reflux component (100), the denitrification area (40) is connected to the reflux distribution area (10) via a third reflux component (110), and the top of the nitrification area (60) is provided with a water outlet area (70) and an exhaust port (80); The cross-section of the integrated treatment device is circular, and the height-to-diameter ratio is 3-10; the volume ratio of the return water distribution zone (10), the anaerobic ammonia oxidation zone (20), the inlet water distribution zone (30), the denitrification zone (40), the short-cut nitrification zone (50), and the nitrification zone (60) is 1: (6-9): (2-3): (4-6): (6-9): (2-3).

2. The integrated treatment device for deep denitrification of high ammonia nitrogen wastewater according to claim 1, characterized in that: A first biological carrier (22) is provided inside the anaerobic ammonium oxidation zone (20); A stirrer (32) is provided inside the water inlet and distribution area (30); A second biological carrier (42) is provided inside the denitrification zone (40); An aeration pipe system (52) and a third biological carrier (53) are provided inside the short-range nitrification zone (50); A fourth biological carrier (62) is provided inside the nitrification zone (60), and an exhaust port (80) is provided on the top.

3. The integrated treatment device for deep denitrification of high ammonia nitrogen wastewater according to claim 1, characterized in that: A first supporting orifice plate (21) is provided at the junction of the return water distribution zone (10) and the anaerobic ammonium oxidation zone (20), a second supporting orifice plate (31) is provided at the junction of the anaerobic ammonium oxidation zone (20) and the inlet water distribution zone (30), a third supporting orifice plate (41) is provided at the junction of the inlet water distribution zone (30) and the denitrification zone (40), a fourth supporting orifice plate (51) is provided at the junction of the denitrification zone (40) and the short-range nitrification zone (50), and a fifth supporting orifice plate (61) is provided at the junction of the short-range nitrification zone (50) and the nitrification zone (60); A plurality of flow holes with a diameter of 2 to 10 mm are arranged on the first supporting orifice plate (21), the second supporting orifice plate (31), the third supporting orifice plate (41), the fourth supporting orifice plate (51), and the fifth supporting orifice plate (61).

4. The integrated treatment device for deep denitrification of high ammonia nitrogen wastewater according to claim 1, characterized in that: The first biological carrier (22), the second biological carrier (42), the third biological carrier (53), and the fourth biological carrier (62) are independently selected from one of biological ropes, hollow suspended fillers, and polyurethane foam.

5. The integrated treatment device for deep denitrification of high ammonia nitrogen wastewater according to claim 1, characterized in that: The water outlet area (70) includes an overflow port (71), a water outlet channel (72), and a water outlet (73); The overflow port (71) is provided on the top side wall of the nitrification zone (60), the outlet channel (72) is arranged along the bottom of the overflow port (71), and the outlet port (73) is provided at the bottom of the outlet channel (72); The distance between the water outlet (73) and the overflow outlet (71) is 300-900 mm.

6. A treatment method for deep denitrification of high ammonia nitrogen wastewater, characterized in that: An integrated treatment device for deep denitrification of high-ammonia nitrogen wastewater according to any one of claims 1 to 5, specifically comprising the following steps: (S1) The high-ammonia nitrogen wastewater enters the water distribution area (30), is mixed and then flows upward into the denitrification area (40), where nitrate nitrogen in the high-ammonia nitrogen wastewater is removed and organic matter in the high-ammonia nitrogen wastewater is consumed, thereby obtaining the treated wastewater in the denitrification area; (S2) A portion of the wastewater treated in the denitrification zone flows upward into the short-range nitrification zone (50), and another portion of the wastewater treated in the denitrification zone flows back to the return water distribution zone (10); (S3) After the wastewater treated in the denitrification zone enters the short-cut nitrification zone (50), part of the ammonia nitrogen is converted into nitrite nitrogen, and the wastewater treated in the short-cut nitrification zone is obtained; (S4) a portion of the wastewater treated in the short-cut nitrification zone flows upward into the nitrification zone (60), a portion of the wastewater treated in the short-cut nitrification zone flows back to the inlet distribution zone (30), and another portion of the wastewater treated in the short-cut nitrification zone flows back to the return distribution zone (10); (S5) After the wastewater treated in the short-cut nitrification zone enters the nitrification zone (60), a nitrification reaction is carried out to obtain effluent from the device, ensuring that the nitrite nitrogen concentration in the effluent meets the standard and reducing the ecological risk of effluent discharge; (S6) The effluent from a portion of the devices is directly discharged, while the effluent from the other portion of the devices flows back to the return water distribution area (10); The denitrification zone treated wastewater in the return water distribution area (10) and the short-cut nitrification zone treated wastewater are mixed and flow upward to the anaerobic ammonium oxidation zone (20), where they are treated to obtain anaerobic ammonium oxidation zone treated wastewater, which then flows upward to the inlet water distribution area (30).

7. A method for deep denitrification of high ammonia nitrogen wastewater according to claim 6, characterized in that: The dissolved oxygen concentration in the short-range nitrification section is 0.5~0.8 mg / L; The dissolved oxygen concentration in the anaerobic ammonium oxidation section is lower than 0.2 mg / L.

8. A method for deep denitrification of high-ammonia nitrogen wastewater according to claim 6, characterized in that: The return flow rate of the wastewater treated in the denitrification zone (40) is 10% to 50% of the wastewater treated in the denitrification zone (40); The return flow rate of the short-cut nitrification zone treated wastewater back to the inlet distribution area (30) is 5% to 20% of the short-cut nitrification zone treated wastewater, and the return flow rate to the return distribution area (10) is 60% to 80% of the short-cut nitrification zone treated wastewater.

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