A short-range nitrification coupled with anaerobic ammonium oxidation wastewater treatment system

Abstract

This utility model relates to the technical field of wastewater treatment, providing a short-cut nitrification coupled with anaerobic ammonium oxidation wastewater treatment system, comprising: a wastewater collection zone, a wastewater equalization zone, a short-cut nitrification reaction zone, an anaerobic ammonium oxidation reaction zone, and a secondary sedimentation tank. The wastewater collection zone collects raw wastewater and removes suspended solids; the outlet of the wastewater collection zone is connected to the wastewater equalization zone, which equalizes the raw wastewater flowing into the collection zone; the wastewater equalization zone is connected to the short-cut nitrification reaction zone via a second output channel; the wastewater equalization zone is connected to the anaerobic ammonium oxidation reaction zone via a first output channel, and the ratio of the raw wastewater flow rate output from the second output channel to the raw wastewater flow rate output from the first output channel is 6:4; the outlet of the short-cut nitrification reaction zone is connected to the anaerobic ammonium oxidation reaction zone; the outlet of the anaerobic ammonium oxidation reaction zone is connected to the secondary sedimentation tank. This system achieves highly efficient nitrogen removal under anaerobic conditions, requires no organic carbon source, and reduces sludge production, thus achieving energy conservation and pollution reduction.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, and more specifically, to a short-range nitrification coupled anaerobic ammonia oxidation wastewater treatment system. Background Technology

[0002] Currently, rural domestic sewage is generally treated using heterotrophic biological nitrogen removal technology based on aerobic nitrification-denitrification. However, if this process is to achieve high water quality discharge standards, it often requires a large amount of energy and resources. Insufficient carbon sources lead to low nitrogen removal efficiency, high aeration energy consumption, and the addition of external carbon sources increases operating costs. Utility Model Content

[0003] The purpose of this invention is to provide a short-cut nitrification coupled with anaerobic ammonia oxidation wastewater treatment system to solve the technical problem of low nitrogen removal efficiency caused by the use of aerobic nitrification-denitrification in wastewater treatment in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a short-range nitrification coupled with anaerobic ammonia oxidation wastewater treatment system, comprising:

[0006] Wastewater collection area, which is used to collect raw wastewater and remove suspended solids;

[0007] The wastewater regulating zone is connected to the outlet of the wastewater collection zone, and the wastewater regulating zone is used to balance the raw wastewater flowing into the wastewater collection zone.

[0008] A short-cut nitrification reaction zone is provided, and the wastewater conditioning zone is connected to the short-cut nitrification reaction zone via a second output channel.

[0009] The anaerobic ammonia oxidation reaction zone is connected to the wastewater conditioning zone through a first output channel, and the ratio of the raw wastewater flow rate output by the second output channel to the raw wastewater flow rate output by the first output channel is 6:4. The effluent end of the short-cut nitrification reaction zone is connected to the anaerobic ammonia oxidation reaction zone.

[0010] The effluent end of the anaerobic ammonia oxidation reaction zone is connected to the secondary sedimentation tank.

[0011] According to the aforementioned short-range nitrification coupled anaerobic ammonia oxidation wastewater treatment system, a screen is installed in the wastewater collection area to remove suspended solids.

[0012] According to the aforementioned short-range nitrification coupled anaerobic ammonia oxidation wastewater treatment system, a flow guide baffle is installed in the wastewater regulation zone to balance water quality and quantity.

[0013] According to the above-described short-range nitrification coupled anaerobic ammonium oxidation wastewater treatment system, the wastewater treatment system further includes a booster pump, a first inlet pipe, a second inlet pipe, an electric three-way valve, a first manual ball valve, a first electromagnetic flow meter, a second manual ball valve, and a second electromagnetic flow meter.

[0014] The booster pump is located in the wastewater regulating zone. The booster pump is connected to one end of the first inlet pipe. The first inlet pipe is sequentially equipped with the electric three-way valve, the first manual ball valve, and the first electromagnetic flow meter. The other end of the first inlet pipe is connected to the anaerobic ammonia oxidation reaction zone.

[0015] One end of the second inlet pipe is connected between the electric three-way valve and the first manual ball valve. The second inlet pipe is sequentially equipped with the second manual ball valve and the second electromagnetic flow meter. The other end of the second inlet pipe is connected to the short-range nitrification reaction zone.

[0016] According to the aforementioned short-cut nitrification coupled with anaerobic ammonium oxidation wastewater treatment system, multiple aeration blowers are installed at the bottom of the short-cut nitrification reaction zone.

[0017] According to the above-described short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system, the short-cut nitrification reaction zone is equipped with a first pH meter, a first thermometer, and a first dissolved oxygen meter.

[0018] And / or, the anaerobic ammonia oxidation reaction zone is equipped with a second pH meter, a second thermometer, and a second dissolved oxygen meter.

[0019] According to the above-described short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system, the short-cut nitrification reaction zone is filled with suspended packing material.

[0020] And / or, the anaerobic ammonia oxidation reaction zone is equipped with a stirrer and polyurethane sponge packing, wherein the stirrer is used to stir the polyurethane sponge packing.

[0021] According to the aforementioned short-cut nitrification coupled anaerobic ammonia oxidation wastewater treatment system, the secondary sedimentation tank includes an inclined plate sedimentation tank, an inclined tube sedimentation tank, and a sludge sedimentation tank, which are arranged sequentially from top to bottom.

[0022] According to the aforementioned short-cut nitrification coupled anaerobic ammonia oxidation wastewater treatment system, the bottom of the sludge sedimentation tank is connected to the bottom of the short-cut nitrification reaction zone, and part of the sludge discharged from the bottom of the sludge sedimentation tank is returned to the short-cut nitrification reaction zone.

[0023] According to the aforementioned short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system, the wastewater collection area, the wastewater conditioning area, the short-cut nitrification reaction area, the anaerobic ammonium oxidation reaction area, and the top of the secondary sedimentation tank are all equipped with insulation boards and form sealed spaces.

[0024] The beneficial effects of the short-range nitrification coupled anaerobic ammonium oxidation wastewater treatment system provided by this utility model are at least as follows:

[0025] The short-cut nitrification coupled with anaerobic ammonia oxidation wastewater treatment system provided by this utility model is mainly used to treat rural domestic sewage with low C / N ratio. It adopts a two-point influent method. The raw sewage is screened to remove suspended solids and then balanced in the sewage conditioning zone. About 60% of the raw sewage enters the short-cut nitrification reaction zone for nitrification, and about 40% of the raw sewage enters the anaerobic ammonia oxidation reaction zone to replenish ammonia nitrogen and dilute the nitrite concentration. Moreover, it reduces the demand for organic carbon by 100%, and achieves efficient denitrification under anaerobic conditions. The microaerobic aeration structure in the short-cut nitrification reaction zone controls the nitrite rate by precisely controlling the dissolved oxygen concentration. This inhibits the activity of nitrite-oxidizing bacteria (NOB) while promoting the accumulation of ammonia-oxidizing bacteria (AOB), thus stably maintaining the nitrite (NO2--N) accumulation rate (nitrite rate ≥80%) and providing optimal substrate conditions for the subsequent anaerobic ammonia oxidation reaction. Under strictly anaerobic conditions, nitrite nitrogen reacts directly with the remaining ammonia nitrogen in the wastewater under the action of anaerobic ammonia oxidizing bacteria to produce nitrogen gas, thereby removing ammonia nitrogen from the wastewater with high denitrification efficiency. Based on the experimental process, the process control parameters for the short-cut nitrification coupled with anaerobic ammonia oxidation reaction were determined to ensure that, under the premise of nitrogen and phosphorus removal, the aeration volume and carbon source addition are reduced, saving more than 60% of the aeration volume, eliminating the need for organic carbon sources, and reducing sludge production, achieving energy conservation and pollution reduction, and contributing to the achievement of dual carbon targets. The integrated short-cut nitrification combined with anaerobic ammonium oxidation method achieves synergistic reactions of short-cut nitrification and anaerobic ammonium oxidation in the same unit, effectively saving land area. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A flowchart of the wastewater treatment system provided by this utility model;

[0028] Figure 2 A schematic diagram of the wastewater treatment system provided by this utility model.

[0029] The following are the labeling elements in the figure:

[0030] 100. Wastewater treatment system; 10. Wastewater collection area; 11. Bar screen; 20. Wastewater regulating area; 21. Baffle plate; 211. First baffle plate; 212. Second baffle plate; 213. Third baffle plate; 22. Booster pump; 30. Short-cut nitrification reaction zone; 31. Second inlet pipe; 32. Second manual ball valve; 33. Second electromagnetic flow meter; 34. First pH meter; 35. First thermometer; 36. First dissolved oxygen meter; 3 7. Aeration blower; 38. Suspended packing material; 40. Anaerobic ammonia oxidation reaction zone; 41. First inlet pipe; 42. Electric three-way valve; 43. First manual ball valve; 44. First electromagnetic flow meter; 45. Second pH meter; 46. Second thermometer; 47. Second dissolved oxygen meter; 48. Polyurethane sponge packing material; 49. Agitator; 50. Secondary sedimentation tank; 51. Inclined plate sedimentation tank; 52. Inclined tube sedimentation tank; 53. Sludge sedimentation tank; 60. Insulation board. Detailed Implementation

[0031] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0032] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0033] Please see Figure 1 and Figure 2This embodiment provides a short-cut nitrification coupled with anaerobic ammonium oxidation wastewater treatment system 100, including a wastewater collection zone 10, a wastewater equalization zone 20, a short-cut nitrification reaction zone 30, an anaerobic ammonium oxidation reaction zone 40, and a secondary sedimentation tank 50 arranged sequentially. The wastewater collection zone 10 is used to collect raw wastewater and remove suspended solids; the outlet of the wastewater collection zone 10 is connected to the wastewater equalization zone 20, which is used to equalize the raw wastewater flowing into the wastewater collection zone 10; the wastewater equalization zone 20 is connected to the short-cut nitrification reaction zone 30 through a second output channel; the wastewater equalization zone 20 is connected to the anaerobic ammonium oxidation reaction zone 40 through a first output channel, and the ratio of the raw wastewater flow rate output by the second output channel to the raw wastewater flow rate output by the first output channel is 6:4. The effluent end of the short-cut nitrification reaction zone 30 is connected to the anaerobic ammonia oxidation reaction zone 40, which adopts a two-point inlet arrangement. 60% of the raw wastewater, which produces nitrite wastewater after passing through the short-cut nitrification reaction zone 30, enters the anaerobic ammonia oxidation reaction zone 40. The nitrite wastewater is fully mixed with the 40% of raw wastewater entering the anaerobic ammonia oxidation reaction zone 40, and ammonia nitrogen and nitrite are converted into nitrogen gas under anaerobic conditions, achieving deep removal of nitrogen gas. The effluent end of the anaerobic ammonia oxidation reaction zone 40 is connected to the secondary sedimentation tank 50, where sludge and water are separated.

[0034] In one embodiment, see Figure 2 The tops of the wastewater collection area 10, the wastewater conditioning area 20, the short-cut nitrification reaction area 30, the anaerobic ammonia oxidation reaction area 40, and the secondary sedimentation tank 50 are all equipped with heat insulation boards 60 and form sealed spaces respectively.

[0035] Polyurethane insulation boards 60 are installed on the top of each zone, and the polyurethane insulation boards 60 of each zone are connected as a whole, so that each zone forms a sealed space. This can ensure that each zone maintains a corresponding stable temperature, especially the suitable temperature required by ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria. The anaerobic ammonia oxidation reaction zone 40 not only maintains the suitable temperature required for the reaction, but also prevents dissolved oxygen in the air from dissolving in the wastewater, keeping the anaerobic ammonia oxidation zone in an anaerobic state.

[0036] In one embodiment, see Figure 2 The sewage collection area 10 is equipped with a screen 11 for removing suspended solids.

[0037] Optionally, the grille 11 can be a mechanical grille with a grid spacing of 5mm to 20mm. Optionally, the grille 11 can be a mechanical grille with a grid spacing of 10mm. It should be understood that the grid spacing of the grille 11 is not limited to the above situations, and can also be other situations, which are not limited here.

[0038] In one embodiment, see Figure 2 The wastewater regulation zone 20 is equipped with a flow guide baffle 21 to balance water quality and quantity.

[0039] Optionally, the wastewater regulating zone 20 is equipped with multiple flow-guiding baffles 21, including a first flow-guiding baffle 211, a second flow-guiding baffle 212, and a third flow-guiding baffle 213 arranged sequentially. The first flow-guiding baffle 211 has a first preset space from the bottom of the wastewater regulating zone 20, the second flow-guiding baffle 212 has a second preset space from the top of the wastewater regulating zone 20 (i.e., the lower surface of the insulation plate 60), and the third flow-guiding baffle 213 has a third preset space from the bottom of the wastewater regulating zone 20. The raw wastewater passes through the first preset space, the second preset space, and the third preset space sequentially through the cooperation of the first flow-guiding baffle 211, the second flow-guiding baffle 212, and the third flow-guiding baffle 213, thereby achieving a balance of water quality and quantity. It should be understood that the number and arrangement of the flow-guiding baffles 21 are not limited to the above-described scenario and can also include other scenarios, which are not limited here.

[0040] In one embodiment, see Figure 2 The wastewater treatment system 100 also includes a booster pump 22, a first inlet pipe 41 (corresponding to the first output channel), a second inlet pipe 31 (corresponding to the second output channel), an electric three-way valve 42, a first manual ball valve 43, a first electromagnetic flow meter 44, a second manual ball valve 32, and a second electromagnetic flow meter 33.

[0041] The lift pump 22 is located in the wastewater regulating zone 20. The lift pump 22 is connected to one end of the first inlet pipe 41. The first inlet pipe 41 is sequentially equipped with the electric three-way valve 42, the first manual ball valve 43, and the first electromagnetic flow meter 44. The other end of the first inlet pipe 41 is connected to the anaerobic ammonia oxidation reaction zone 40.

[0042] One end of the second inlet pipe 31 is connected between the electric three-way valve 42 and the first manual ball valve 43. The second manual ball valve 32 and the second electromagnetic flow meter 33 are sequentially installed on the second inlet pipe 31. The other end of the second inlet pipe 31 is connected to the short-range nitrification reaction zone 30.

[0043] The raw wastewater from the wastewater regulating zone 20 enters the short-cut nitrification reaction zone 30 and the anaerobic ammonia oxidation reaction zone 40 respectively through the lift pump 22 set at the bottom of the wastewater regulating zone 20. The flow rate is precisely distributed through the electric three-way valve 42, the first manual ball valve 43, the first electromagnetic flow meter 44 set sequentially on the first inlet pipe 41, and the second manual ball valve 32 and the second electromagnetic flow meter 33 set sequentially on the second inlet pipe 31, so that the flow ratio is about 6:4, that is, 60% of the raw wastewater enters the short-cut nitrification reaction zone 30 and 40% of the raw wastewater enters the anaerobic ammonia oxidation reaction zone 40. The raw wastewater inlet point of the anaerobic ammonia oxidation is set below the water surface to prevent water droplet aeration. The first inlet pipe 41 adopts a perforated pipe inlet method below the water surface, so as to utilize uniform water output and reduce the water output intensity.

[0044] In one embodiment, see Figure 2 The short-cut nitrification reaction zone 30 is equipped with a first pH meter 34, a first thermometer 35, and a first dissolved oxygen meter 36. The first pH meter 34, the first thermometer 35, and the first dissolved oxygen meter 36 are used to monitor the pH value, temperature, and dissolved oxygen of the wastewater in the short-cut nitrification reaction zone 30, respectively.

[0045] Optionally, the temperature in the short-cut nitrification reaction zone 30 is maintained at 20℃~30℃ to maintain the activity of ammonia-oxidizing bacteria; the pH meter range is maintained between 7.5 and 8.5 to ensure that the ammonia-oxidizing bacteria maintain high activity; and the dissolved oxygen concentration is maintained in the range of 0.3~1.0mg / L.

[0046] In one embodiment, see Figure 2 Multiple aeration blowers 37 are installed at the bottom of the short-cut nitrification reaction zone 30. Micro-aeration oxygen supply is provided using the aeration blowers 37, with an aeration flow rate of 40% of the total flow rate. The dissolved oxygen concentration is precisely controlled by a solenoid valve at the outlet of the aeration blower 37 and a first dissolved oxygen meter 36, maintaining the dissolved oxygen concentration within the range of 0.3–1.0 mg / L. This saves approximately 50–70% of energy consumption, contributing to the achievement of low-carbon goals. To maintain a low dissolved oxygen concentration in the short-cut nitrification reaction zone 30, aeration blowers 37 with a diameter of Φ215 are used, with a service area of ​​0.75–1.5 m². 2 / each, to make the short-cut nitrification reaction zone 30 micro-powered oxygenation, maintaining the reaction zone in an anaerobic state.

[0047] In one embodiment, see Figure 2The anaerobic ammonia oxidation reaction zone 40 is equipped with a second pH meter 45, a second thermometer 46, and a second dissolved oxygen meter 47. The second pH meter 45, the second thermometer 46, and the second dissolved oxygen meter 47 are used to monitor the pH value, temperature, and dissolved oxygen of the wastewater in the anaerobic ammonia oxidation reaction zone 40, respectively. Optionally, the temperature is 25℃~35℃, the pH is 7.0-8.5, and the dissolved oxygen is ≤0.2mg / L.

[0048] In one embodiment, see Figure 2 The short-cut nitrification reaction zone 30 is filled with suspended packing material 38. The suspended packing material 38 is used to rapidly enrich ammonia-oxidizing bacteria (AOB) and provide suitable conditions for the short-cut nitrification reaction zone 30.

[0049] Optionally, the short-cut nitrification reaction zone 30 is filled with suspended biological packing material, using a combination of Φ150mm and 50mm spacing suspended packing material 38 to ensure rapid biofilm formation. The filling ratio is 30%, which rapidly enriches ammonia-oxidizing bacteria (AOB) and provides suitable conditions for the short-cut nitrification reaction.

[0050] In one embodiment, see Figure 2 The anaerobic ammonia oxidation reaction zone 40 is equipped with a stirrer 49 and a polyurethane sponge packing 48, wherein the stirrer 49 is used to stir the polyurethane sponge packing 48.

[0051] The anaerobic ammonia oxidation reaction zone 40 is filled with suspended biological packing material, using hydrophilic polyurethane biological packing material, with polyurethane sponge bodies with a side distance of 50mm. A strictly anaerobic environment is easily formed inside the mesh-like sponge body, which is conducive to the survival of anaerobic ammonia oxidizing bacteria, while simultaneously increasing sludge concentration and enriching the concentration of anaerobic ammonia oxidizing bacteria. The filling ratio is 30%, and the specific surface area of ​​the suspended biological packing material is 1500–3000 m² / m³. The agitator 49 is maintained at a speed of 15–30 r / min within the anaerobic ammonia oxidation reaction zone 40 to prevent sedimentation of the suspended packing material 38. Maintaining a low speed is to prevent oxygenation.

[0052] In one embodiment, see Figure 2 The secondary sedimentation tank 50 includes an inclined plate sedimentation tank 51, an inclined tube sedimentation tank 52, and a sludge sedimentation tank 53, which are arranged sequentially from top to bottom.

[0053] The connection between the anaerobic ammonia oxidation reaction zone 40 and the secondary sedimentation tank 50 is located at the upper part of the secondary sedimentation tank 50. The raw sewage enters the secondary sedimentation tank 50 and passes through the inclined plate sedimentation tank 51, the inclined tube sedimentation tank 52 and the sludge sedimentation tank 53 in sequence to achieve sludge-water separation. The supernatant is discharged as the treated effluent. The supernatant outlet is located at the upper part of the inclined plate sedimentation tank 51 to facilitate the discharge of the supernatant. Part of the settled sludge is returned to the short-cut nitrification reaction zone 30, and the remaining sludge is discharged.

[0054] In one embodiment, see Figure 2 The bottom of the sludge settling tank 53 is connected to the bottom of the short-cut nitrification reaction zone 30. A portion of the sludge discharged from the bottom of the sludge settling tank 53 is returned to the short-cut nitrification reaction zone 30. Returning a portion of the sludge formed in the sludge settling tank 53 to the short-cut nitrification reaction zone 30 maintains the sludge concentration and the concentration of ammonia-oxidizing bacteria within the zone. The remaining sludge is discharged, thus reducing the overall sludge discharge. Optionally, the sludge returned to the short-cut nitrification reaction zone 30 may be 50% to 75% of the total sludge production.

[0055] The process of the short-range nitrification coupled anaerobic ammonium oxidation wastewater treatment system provided in this embodiment is as follows:

[0056] Wastewater pretreatment process: The process of treating wastewater in wastewater collection area 10 and wastewater regulation area 20 is the wastewater pretreatment process. Wastewater with low carbon-nitrogen ratio (low C / N) from rural domestic use is collected in wastewater collection area 10. After large particulate suspended solids are removed by mechanical screen 11 with a 10mm spacing in wastewater collection area 10, the wastewater enters wastewater regulation area 20. In wastewater regulation area 20, flow guide baffles 21 are set to balance water quality and quantity.

[0057] Short-cut nitrification reaction zone 30: The flow rate is precisely distributed through the electric three-way valve 42, the first manual ball valve 43, the first electromagnetic flow meter 44, which are sequentially installed on the first inlet pipe 41, and the second manual ball valve 32 and the second electromagnetic flow meter 33, which are sequentially installed on the second inlet pipe 31, so that the flow ratio is about 6:4, that is, 60% of the raw wastewater enters the short-cut nitrification reaction zone 30 and 40% of the raw wastewater enters the anaerobic ammonia oxidation reaction zone 40. In the short-cut nitrification reaction zone 30, micro-aeration oxygen supply is provided by aeration blower 37. The dissolved oxygen in the short-cut nitrification reaction zone 30 is maintained at 0.3-1.0 mg / L by the linkage between the first dissolved oxygen meter 36 and aeration blower 37. The ammonia nitrogen is oxidized to nitrite by the enriched ammonia oxidizing bacteria, maintaining low oxygen, inhibiting the enrichment of nitrite oxidizing bacteria, and inhibiting the formation of nitrate. Under the action of ammonia oxidizing bacteria (AOB), the ammonia nitrogen pollutants in the wastewater react to produce nitrite oxidizing bacteria (NOB). The reaction equation is: NH4++1.5O2+2HCO3-→NO2-+2CO2+3H2O;

[0058] Anaerobic ammonia oxidation zone: 60% of the raw wastewater, which has undergone nitrite production in the short-cut nitrification zone (30°C), is thoroughly mixed with the remaining 60% of the raw wastewater entering the anaerobic ammonia oxidation zone. Under anaerobic conditions, microorganisms utilize ammonia nitrogen (NH4+) as the active ingredient. + ) is an electron donor, nitrite nitrogen (NO2) -( ) is the process by which ammonia nitrogen and nitrite nitrogen are converted into nitrogen gas (N2) by the electron acceptor.

[0059] The reaction equation is: NH4++1.32NO2-+0.066HCO3-+0.13H+→1.2N2↑+0.26NO3-+0.066CH2O0.5NO0.15+2.03H2O; This process does not require an organic carbon source as an electron donor, which greatly saves carbon source and aeration volume compared with the traditional nitrification-denitrification process.

[0060] Secondary sedimentation tank 50: Raw wastewater enters the secondary sedimentation tank 50 and passes through the inclined plate sedimentation tank 51, the inclined tube sedimentation tank 52, and the sludge sedimentation tank 53 in sequence to achieve sludge-water separation. The supernatant is discharged as treated effluent, and part of the settled sludge is returned to the short-cut nitrification reaction zone 30 to maintain the sludge concentration in the short-cut nitrification reaction zone 30 and maintain the concentration of ammonia oxidizing bacteria. The remaining sludge is discharged, which reduces the overall amount of sludge discharged.

[0061] The beneficial effects of the short-range nitrification coupled anaerobic ammonium oxidation wastewater treatment system provided in this embodiment are as follows:

[0062] The short-cut nitrification coupled with anaerobic ammonia oxidation wastewater treatment system provided in this embodiment is mainly used to treat rural domestic sewage with low C / N ratio. It adopts a two-point influent method. The raw sewage passes through the screen 11 to remove suspended solids and then passes through the sewage equalization zone 20 to balance the water quality and quantity. About 60% of the raw sewage enters the short-cut nitrification reaction zone 30 for nitrification, and about 40% of the raw sewage enters the anaerobic ammonia oxidation reaction zone 40 to replenish ammonia nitrogen and dilute the nitrite concentration. Moreover, it reduces the demand for organic carbon by 100%, achieving efficient denitrification under anaerobic conditions. The 30° microaerobic aeration structure in the short-cut nitrification reaction zone controls the nitrite rate. The core of this approach lies in precisely controlling the dissolved oxygen concentration to inhibit the activity of nitrite-oxidizing bacteria (NOB) while simultaneously promoting the accumulation of ammonia-oxidizing bacteria (AOB), thereby stably maintaining the nitrite (NO2--N) accumulation rate (nitrite rate ≥80%) and providing optimal substrate conditions for the subsequent anaerobic ammonia oxidation reaction. Under strictly anaerobic conditions, nitrite nitrogen reacts directly with residual ammonia nitrogen in the wastewater under the action of anaerobic ammonia oxidizing bacteria, producing nitrogen gas, thus removing ammonia nitrogen from the wastewater with high denitrification efficiency. Based on the experimental process, the process control parameters for the short-cut nitrification coupled with anaerobic ammonia oxidation reaction were determined to ensure that, under the premise of nitrogen and phosphorus removal, the aeration volume and carbon source dosage are reduced, saving more than 60% of the aeration volume, eliminating the need for organic carbon sources, and reducing sludge production, achieving energy conservation and pollution reduction, and contributing to the achievement of dual carbon targets. The integrated short-cut nitrification combined with anaerobic ammonium oxidation method achieves synergistic reactions of short-cut nitrification and anaerobic ammonium oxidation in the same unit, effectively saving land area.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A short-cut nitrification coupled with anaerobic ammonia oxidation wastewater treatment system, characterized in that, include: Wastewater collection area, which is used to collect raw wastewater and remove suspended solids; A wastewater regulating zone is provided, with the outlet of the wastewater collection zone connected to the wastewater regulating zone. The wastewater regulating zone is used to balance the original wastewater flowing into the wastewater collection zone. A short-cut nitrification reaction zone is provided, and the wastewater conditioning zone is connected to the short-cut nitrification reaction zone via a second output channel. The anaerobic ammonia oxidation reaction zone is connected to the wastewater conditioning zone through a first output channel, and the ratio of the raw wastewater flow rate output by the second output channel to the raw wastewater flow rate output by the first output channel is 6:

4. The effluent end of the short-cut nitrification reaction zone is connected to the anaerobic ammonia oxidation reaction zone. The effluent end of the anaerobic ammonia oxidation reaction zone is connected to the secondary sedimentation tank.

2. The short-cut nitrification coupled ANAMMOX wastewater treatment system according to claim 1, characterized in that, The wastewater collection area is equipped with a screen to remove suspended solids.

3. The short-cut nitrification coupled ANAMMOX wastewater treatment system according to claim 1, characterized in that, The wastewater regulation zone is equipped with flow guide baffles to balance water quality and quantity.

4. The short-cut nitrification coupled ANAMMOX wastewater treatment system according to claim 1, characterized in that, The wastewater treatment system also includes a booster pump, a first inlet pipe, a second inlet pipe, an electric three-way valve, a first manual ball valve, a first electromagnetic flow meter, a second manual ball valve, and a second electromagnetic flow meter; The booster pump is located in the wastewater regulating zone. The booster pump is connected to one end of the first inlet pipe. The first inlet pipe is sequentially equipped with the electric three-way valve, the first manual ball valve, and the first electromagnetic flow meter. The other end of the first inlet pipe is connected to the anaerobic ammonia oxidation reaction zone. One end of the second inlet pipe is connected between the electric three-way valve and the first manual ball valve. The second inlet pipe is sequentially equipped with the second manual ball valve and the second electromagnetic flow meter. The other end of the second inlet pipe is connected to the short-range nitrification reaction zone.

5. The short-cut nitrification coupled ANAMMOX wastewater treatment system according to claim 1, characterized in that, Multiple aeration fans are installed at the bottom of the short-range nitrification reaction zone.

6. The short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system according to claim 1, characterized in that, The short-range nitrification reaction zone is equipped with a first pH meter, a first thermometer, and a first dissolved oxygen meter. And / or, the anaerobic ammonia oxidation reaction zone is equipped with a second pH meter, a second thermometer, and a second dissolved oxygen meter.

7. The short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system according to claim 1, characterized in that, The short-range nitration reaction zone is filled with suspended packing material; And / or, the anaerobic ammonia oxidation reaction zone is equipped with a stirrer and polyurethane sponge packing, wherein the stirrer is used to stir the polyurethane sponge packing.

8. The short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system according to claim 1, characterized in that, The secondary sedimentation tank includes an inclined plate sedimentation tank, an inclined tube sedimentation tank, and a sludge sedimentation tank, which are arranged sequentially from top to bottom.

9. The short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system according to claim 8, characterized in that, The bottom of the sludge sedimentation tank is connected to the bottom of the short-cut nitrification reaction zone, and part of the sludge discharged from the bottom of the sludge sedimentation tank is returned to the short-cut nitrification reaction zone.

10. The short-cut nitrification coupled anaerobic ammonium oxidation wastewater treatment system according to claim 1, characterized in that, The wastewater collection area, the wastewater conditioning area, the short-cut nitrification reaction area, the anaerobic ammonia oxidation reaction area, and the top of the secondary sedimentation tank are all equipped with insulation boards and form sealed spaces.

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