System and method for coupling anaerobic ammonia oxidation with synchronous nitrification and denitrification

Abstract

The invention discloses a system and a method for coupling anaerobic ammonia oxidation with synchronous nitrification and denitrification, and belongs to the technical field of wastewater treatment. Comprising an inner area, the bottom of the inner area is provided with a water distributor connected with a water inlet pipe, a first aerator is arranged below the water distributor, a three-phase separator is arranged above the water distributor, and an air outlet and an overflow weir are arranged above the three-phase separator; the outer area sleeves the outer side of the inner area, filler is arranged in the outer area, and a second aerator is arranged at the bottom of the outer area; the outer area comprises four vertically-arranged partition plates, the four partition plates divide the outer area into four areas, and the four areas are the first area, the second area, the third area and the fourth area in sequence according to the water flow direction; the overflow weir is connected with the first area, the partition plate between the first area and the fourth area is not provided with holes, the other partition plates are provided with holes for water flow to pass through, and the fourth area is provided with a water outlet. According to anaerobic ammonia oxidation, most of total nitrogen is removed with low energy consumption, residual ammonia nitrogen is subjected to synchronous nitrification and denitrification by adding surpassing raw water, and low-cost and low-emission denitrification is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and particularly relates to a system and method for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification. Background Art

[0002] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present invention, and it is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] Currently, the most economical and effective nitrogen removal method in the field of nitrogen removal is still biological nitrogen removal. However, the traditional nitrification and denitrification process requires a large amount of energy consumption for the reflux of nitrified liquid and also requires a large amount of additional organic carbon source to be added, thereby reducing the total nitrogen in the sewage. A large amount of carbon dioxide will be generated during this process, which does not meet the requirements of energy conservation and emission reduction.

[0004] As a new type of nitrogen removal process, anaerobic ammonium oxidation is increasingly widely used in industrial sewage treatment plants. Its reaction mechanism is to directly react ammonia nitrogen with nitrite from shortcut nitrification to generate nitrogen gas. It is a highly efficient nitrogen removal technology that meets the requirements of energy conservation and emission reduction. Compared with the traditional nitrification and denitrification process, this process does not require additional carbon source supplementation and can also save half of the dissolved oxygen consumption and the power consumption of nitrified liquid reflux. However, from the reaction mechanism of anaerobic ammonium oxidation, its maximum nitrogen removal efficiency is 87%. According to the actual anaerobic ammonium oxidation application case data, under oxygen-limited conditions, the anaerobic ammonium oxidation effluent contains about 30% nitrate nitrogen and may also contain some ammonia nitrogen. As another new type of nitrogen removal process, the simultaneous nitrification and denitrification process has the advantage that nitrogen removal can be achieved in one reactor. Patent CN118270951A discloses a nitrogen removal device and method for coupling shortcut simultaneous nitrification and denitrification with anaerobic ammonium oxidation to treat low C / N ratio sewage, which controls the wastewater to flow through the aerobic zone for shortcut simultaneous nitrification and denitrification, the deoxygenation zone, and the anaerobic zone for anaerobic ammonium oxidation in sequence to achieve the coupling of shortcut simultaneous nitrification and denitrification with anaerobic ammonium oxidation. The device is complex, occupies a large area, consumes a large amount of energy, and the ammonia nitrogen removal rate is lower than 95%. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a system and method for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification. The present invention couples anaerobic ammonium oxidation with simultaneous nitrification and denitrification. The autotrophic anaerobic ammonium oxidation without carbon source can achieve low-energy consumption to remove most of the total nitrogen, and the heterotrophic simultaneous nitrification and denitrification can accurately add carbon source with the assistance of detection equipment to achieve low-cost deep nitrogen removal.

[0006] In order to achieve the above purpose, the technical solution of the present invention is as follows: In the first aspect of the present invention, a system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification is provided, comprising: An anaerobic ammonium oxidation inner zone, at the bottom of which there is a water distributor connected to the water inlet pipe, below the water distributor there is a first aerator, above the water distributor there is a three-phase separator, and above the three-phase separator there are an air outlet and an overflow weir; A simultaneous nitrification and denitrification outer zone, sleeved outside the anaerobic ammonium oxidation inner zone, with packing inside and a second aerator at the bottom; the simultaneous nitrification and denitrification outer zone includes four vertically arranged partitions, which divide the simultaneous nitrification and denitrification outer zone into four regions, namely the first region, the second region, the third region and the fourth region in sequence according to the water flow direction; the overflow weir is connected to the first region, there are no holes on the partition between the first region and the fourth region, and there are holes for water flow on the remaining partitions, and the fourth region is provided with a drain outlet.

[0007] In some embodiments of the present invention, the anaerobic ammonium oxidation inner zone further includes a reflux pipe, one end of which is arranged between the three-phase separator and the overflow weir, and the other end is connected to the water distributor.

[0008] In some embodiments of the present invention, the water distributor is a swirl water distributor, which is composed of a main pipe and a funnel-shaped water distributor.

[0009] In some embodiments of the present invention, the first aerator is a perforated aeration pipe, with holes on both sides of the aeration pipe, and the orientation of the aeration holes is 45° obliquely downward.

[0010] In some embodiments of the present invention, the number of layers of the three-phase separator is 1.

[0011] In some embodiments of the present invention, the anaerobic ammonium oxidation inner zone is further provided with an ammonia nitrogen online detector and a nitrate online detector.

[0012] In some embodiments of the present invention, there are holes in the lower part of the partition between the first region and the second region, holes in the upper part of the partition between the second region and the third region, and holes in the lower part of the partition between the third region and the fourth region.

[0013] In some embodiments of the present invention, an ammonia nitrogen online detector and a nitrate online detector are provided at the water inlet of the first region.

[0014] In the second aspect of the present invention, a wastewater treatment method using the system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification is provided, and the system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification is the above-mentioned system, comprising: The wastewater to be treated enters the anaerobic ammonium oxidation inner zone through a water distributor. The first aerator is started, and the dissolved oxygen content in the anaerobic ammonium oxidation inner zone is controlled to be 0.1 - 0.3 mg / L. The wastewater to be treated is mixed with the sludge and flows upward. When the mud-water mixture rises to the three-phase separator, the sludge is intercepted and sinks downward, while the gas and part of the water escape from the gas outlet and enter the overflow weir. The purified wastewater enters the first zone from the overflow weir through a pipeline. The oxygen content in the simultaneous nitrification and denitrification outer zone is controlled to be 0.2 - 0.4 mg / L. A biofilm composed of nitrifying bacteria - anaerobic ammonium oxidizing bacteria - denitrifying bacteria is formed on the surface of the packing from the outside to the inside. Beyond raw water for supplementary carbon source is added to the simultaneous nitrification and denitrification outer zone. The purified wastewater flows through the first zone, the second zone, the third zone and then enters the fourth zone and is discharged in the fourth zone.

[0015] In some embodiments of the present invention, the ammonia nitrogen concentration of the wastewater to be treated is 300 mg / L - 850 mg / L.

[0016] It should be noted that the term "beyond raw water" refers to the sewage in the regulating tank, which is directly added to the system of anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification without anaerobic treatment, bypassing the anaerobic system, so it is called beyond raw water.

[0017] The beneficial effects of the present invention are as follows: The present invention provides a system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification, which couples anaerobic ammonium oxidation with simultaneous nitrification and denitrification, fully combines anaerobic ammonium oxidation and simultaneous nitrification and denitrification. Anaerobic ammonium oxidation ensures the denitrification efficiency of high ammonia nitrogen wastewater, and the remaining ammonia nitrogen undergoes simultaneous nitrification and denitrification by adding beyond raw water, achieving low-cost and low-emission denitrification, saving the dosage of chemicals and reducing production costs. An ammonia nitrogen online detector and a nitrate online detector are provided in the system to monitor the water quality and water volume in real time, and the aeration volume and the carbon source dosage can be accurately controlled according to the water quality and water volume, ensuring the stable operation of anaerobic ammonium oxidation and simultaneous nitrification and denitrification, while saving the dosage of chemicals and reducing production costs. The experimental results prove that the ammonia nitrogen removal rate of this system reaches more than 99%, and the total nitrogen removal rate reaches more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0019] Figure 1 It is the structural diagram of the system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification in Embodiment 1 of the present invention; Figure 2 It is the top view of the system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification in Embodiment 1 of the present invention.

[0020] Among them, 1. the outer region of simultaneous nitrification and denitrification, 2. the inner region of anaerobic ammonium oxidation, 3. the tank wall, 4. the water distributor, 401. the main pipe, 402. the funnel-shaped water distributor 402, 5. the first aerator, 6. the second aerator, 7. the overflow weir, 8. the air outlet, 9. the three-phase separator, 10. the reflux pipe, 11. the on-line ammonia nitrogen detector, 12. the on-line nitrate detector, 13. the first region, 14. the second region, 15. the third region, 16. the fourth region, 17. the partition plate, 18. the outer region water outlet, 19. the inner region water outlet. Specific implementation manners

[0021] One of the cores of the present invention is to provide a system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification. This system couples anaerobic ammonium oxidation with simultaneous nitrification and denitrification, and realizes the removal of most of the total nitrogen with low energy consumption through autotrophic anaerobic ammonium oxidation without a carbon source. Heterotrophic simultaneous nitrification and denitrification accurately add a carbon source with the assistance of detection equipment, achieving low-cost deep nitrogen removal.

[0022] Another core of the present invention is to provide a wastewater treatment method using the above system.

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of the system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification provided by the embodiments of the present invention, Figure 2 and

[0025] discloses a system for coupling anaerobic ammonium oxidation with simultaneous nitrification and denitrification in the embodiments of the present invention. This system includes an inner region 2 of anaerobic ammonium oxidation and an outer region 1 of simultaneous nitrification and denitrification.

[0026] Among them, in the anaerobic ammonium oxidation inner zone 2, a water distributor 4 connected to the water inlet pipe is provided at the bottom. A first aerator 5 is provided below the water distributor 4, a three-phase separator 9 is provided above the water distributor 4, and an air outlet 8 and an overflow weir 7 are provided above the three-phase separator 9. The synchronous nitrification and denitrification outer zone 1 is sleeved outside the anaerobic ammonium oxidation inner zone 2, with fillers inside and a second aerator 6 at the bottom. The synchronous nitrification and denitrification outer zone 1 includes four vertically arranged partition plates 17, which divide the synchronous nitrification and denitrification outer zone into four regions. In the water flow direction, they are the first zone 13, the second zone 14, the third zone 15, and the fourth zone 16 in sequence. The overflow weir 7 is connected to the first zone 13. There are no holes in the partition plate 17 between the first zone 13 and the fourth zone 16, and the remaining partition plates 17 are provided with holes for water flow through. An outer zone water outlet 18 is provided in the fourth zone 16.

[0027] It should be noted that an inner zone water outlet 19 is provided on the overflow weir 7, and the water in the overflow weir enters the first zone 13 of the synchronous nitrification and denitrification outer zone 1 through the inner zone water outlet 19.

[0028] It should be noted that the main body of the system is formed by two carbon steel tanks sleeved together, divided into an anaerobic ammonium oxidation inner zone 2 and a synchronous nitrification and denitrification outer zone 1. That is, the anaerobic ammonium oxidation inner zone 2 is a columnar structure located in the center, and the synchronous nitrification and denitrification outer zone 1 is a cylindrical structure sleeved outside the anaerobic ammonium oxidation inner zone 2.

[0029] It can be seen that compared with the prior art, the system provided in the embodiment of the present invention couples anaerobic ammonium oxidation and synchronous nitrification and denitrification together. The autotrophic anaerobic ammonium oxidation without a carbon source achieves low-energy consumption for removing most of the total nitrogen, and the heterotrophic synchronous nitrification and denitrification accurately adds a carbon source with the assistance of detection equipment to achieve low-cost deep denitrification.

[0030] Specifically, in the embodiment of the present invention, as Figure 1 shown, the anaerobic ammonium oxidation inner zone 2 further includes a reflux pipe 10. One end of the reflux pipe 10 is arranged between the three-phase separator 9 and the overflow weir 7, and the other end is connected to the water distributor 4. The reflux tank 9 is used to achieve internal reflux.

[0031] Specifically, as Figure 1 shown, in the embodiment of the present invention, the water distributor 4 is a swirl water distributor, which is composed of a main pipe 401 and a funnel-shaped water distributor 402, ensuring uniform water distribution without uneven flow. The funnel-shaped water distributor 402 is in a funnel shape and is a conical structure.

[0032] In an embodiment of the present invention, the first aerator 5 is a perforated aeration pipe, with holes on both sides of the aeration pipe, and the orientation of the air holes is 45° obliquely downward. The first aerator 5 is installed below the water distributor 4.

[0033] In an embodiment of the present invention, the number of layers of the three-phase separator 9 is 1. The three-phase separator 9 is arranged above the anammox inner zone 2. Different from the traditional three-phase separator, this three-phase separator 9 has only one layer, and no gas-liquid separator is arranged above the gas outlet 8.

[0034] In an embodiment of the present invention, the overflow weir 7 is arranged above the three-phase separator 9, that is, the overflow weir 7 is arranged at the top of the anammox inner zone 2. An outlet of the inner zone water outlet is provided on the overflow weir 7 and is connected to the first zone 101 of the simultaneous nitrification and denitrification outer zone 1 through a pipeline.

[0035] In an embodiment of the present invention, the anammox inner zone 2 is further provided with an ammonia nitrogen on-line detector 11 and a nitrate on-line detector 12, which can collect the water quality and water volume data of the system in a timely manner and make corresponding adjustments. The probes of the ammonia nitrogen on-line detector 11 and the nitrate on-line detector 12 are both arranged about 50 cm below the water surface above the tank body, and the on-line monitoring instruments are operated on the ground outside the tank.

[0036] In an embodiment of the present invention, holes are provided in the lower part of the partition between the first zone 101 and the second zone 102, holes are provided in the upper part of the partition between the second zone 102 and the third zone 103, and holes are provided in the lower part of the partition between the third zone 103 and the fourth zone 104. The partitions are arranged vertically, and their function is to divide the water area and control the water flow direction. The holes on the partitions are used for the sewage to pass through. By alternately arranging the holes up and down, the interruption of the flow can be effectively prevented.

[0037] In an embodiment of the present invention, an ammonia nitrogen on-line detector 11 and a nitrate on-line detector 12 are provided at the water inlet of the first zone 101, which can collect the water quality and water volume data of the system in a timely manner and make corresponding adjustments.

[0038] In an embodiment of the present invention, the second aerator 6 is a membrane microporous aerator, which is controlled by an electric valve and provides dissolved oxygen for anammox and nitrification.

[0039] In an embodiment of the present invention, fillers are arranged in the simultaneous nitrification and denitrification outer zone 1. The fillers are combined fillers, which provide attachment points for nitrifying bacteria, denitrifying bacteria and anammox bacteria. By controlling the dissolved oxygen content, a biofilm structure composed of nitrifying bacteria - anammox bacteria - denitrifying bacteria can be formed from the outside to the inside.

[0040] It should be noted that the fillers are arranged vertically and are suspended in the simultaneous nitrification and denitrification outer zone 1 by cross beams spanning the partitions and the pipe walls.

[0041] In an embodiment of the present invention, the system is an integrated device for coupling anammox and simultaneous nitrification and denitrification, and its working principle is as follows: The wastewater to be treated enters the anaerobic ammonium oxidation inner zone 2 from the bottom of the anaerobic ammonium oxidation inner zone 2, and after being evenly distributed by the water distributor 4, it flows evenly upward. During the flow, the wastewater to be treated is mixed with the sludge in the anaerobic ammonium oxidation inner zone 2. The nitrite-forming bacteria in the sludge convert part of the ammonia nitrogen in the wastewater into nitrite with the participation of oxygen, and the anaerobic ammonium oxidation bacteria convert the other part of the ammonia nitrogen and nitrite into nitrogen gas, thereby achieving the purpose of removing total nitrogen. This process has specific control requirements, that is, strictly controlling the oxygen content delivered to the anaerobic ammonium oxidation inner zone 2 by the first aerator 5, so that the anaerobic ammonium oxidation inner zone 2 forms a micro-oxygen environment, and the nitrifying bacteria consume oxygen during metabolism, and the oxygen inhibition of the anaerobic ammonium oxidation bacteria is relieved, thereby promoting the anaerobic ammonium oxidation reaction.

[0042] When the mud-water mixture rises to the three-phase separator 9, the sludge is intercepted and sinks to the bottom of the water to continue reacting, and the gas and part of the water escape from the gas outlet 8. The purified wastewater flows through the overflow weir 7 and the pipeline connected to the outlet of the overflow weir 7 through the inner zone outlet 18 to the synchronous nitrification and denitrification outer zone 1.

[0043] The outer zone 1 of synchronous nitrification and denitrification is divided into four zones by a partition 17, and the first zone 13 is connected to the inner zone outlet 19 in the overflow weir 7. The first zone 13 is upper water inlet and lower water outlet. The water inlet of the first zone 13 is provided with an ammonia nitrogen online detector 11 and a nitrate online detector 12, and the ammonia nitrogen and nitrate nitrogen values ​​are detected regularly. The present invention collects water quality data and water volume such as ammonia nitrogen and nitrate in a timely manner through the ammonia nitrogen online detector 11 and the nitrate online detector 12, and accurately adjusts the oxygen supply of the anaerobic ammonia oxidation inner zone 2 through the ammonia nitrogen detection data, so that the anaerobic ammonia oxidation efficiency is increased to about 70%. It should be noted that when the ammonia nitrogen online detector 11 detects that the ammonia nitrogen value exceeds the parameter range set by the process (depending on the different water samples, the parameters are also different, generally 50-150 mg / L), the air volume input by the first aerator 5 is adjusted, and the oxygen supply of the anaerobic ammonia oxidation inner zone 2 is adjusted.

[0044] Although the higher the efficiency of anaerobic ammonia oxidation, the better, the higher the efficiency, the more difficult it is to control. The method provided by the present invention can achieve automatic control and long-term stable operation; the carbon source dosage of the synchronous nitrification and denitrification outer zone 1 is accurately controlled by the nitrate online detector 12 to ensure that the carbon source is sufficient and fully utilized, and to reduce the amount of carbon source while achieving the purpose of denitrification. It should be noted that the carbon source dosage needs to be adjusted according to the nitrate data detected by the nitrate online detector 12 and the process setting parameters (the corresponding parameters are set according to the water quality). When the nitrate concentration is on the rise, the flow rate beyond the raw water is increased, and vice versa.

[0045] The outer region 1 of simultaneous nitrification and denitrification is also provided with combined packing, which provides attachment points for nitrifying bacteria, denitrifying bacteria and anaerobic ammonia-oxidizing bacteria. Under the precise control of the ammonia nitrogen on-line detector 11 and the nitrate on-line detector 12, the outer region 1 of simultaneous nitrification and denitrification presents an overall micro-oxygen environment. During the metabolic process of nitrifying bacteria on the outside of the biofilm, oxygen is consumed, relieving the oxygen inhibition for denitrifying bacteria and anaerobic ammonia-oxidizing bacteria. The nitrite produced by nitrifying bacteria is mass-transferred into the interior of the biofilm and reduced to nitrogen gas by denitrifying bacteria and anaerobic ammonia-oxidizing bacteria, thus achieving the purpose of removing total nitrogen.

[0046] The embodiment of the present invention also provides a wastewater treatment method using a system of anaerobic ammonia oxidation coupled with simultaneous nitrification and denitrification. The system of anaerobic ammonia oxidation coupled with simultaneous nitrification and denitrification is the above-mentioned system, including: The wastewater to be treated enters the anaerobic ammonia oxidation inner region 2 through the water distributor 4. The first aerator 5 is started, and the dissolved oxygen content in the anaerobic ammonia oxidation inner region 2 is controlled to be 0.1 - 0.3 mg / L. The wastewater to be treated is mixed with the sludge and flows upward. When the mud-water mixture rises to the three-phase separator 9, the sludge is intercepted and sinks downward, and the gas and part of the water escape from the gas outlet 8 and enter the overflow weir 7. The purified wastewater enters the first region 101 through the pipeline from the overflow weir 7. The oxygen content in the outer region 1 of simultaneous nitrification and denitrification is controlled to be 0.2 - 0.4 mg / L. A biofilm composed of nitrifying bacteria - anaerobic ammonia-oxidizing bacteria - denitrifying bacteria is formed on the surface of the packing from the outside to the inside. Supplementary carbon source beyond the raw water is added into the outer region 1 of simultaneous nitrification and denitrification. The purified wastewater flows through the first region 13, the second region 14, the third region 15 and then enters the fourth region 16 and is discharged in the fourth region 16.

[0047] In one embodiment of the present invention, the ammonia nitrogen concentration of the wastewater to be treated is 300 mg / L - 850 mg / L. It should be noted that both the inlet and outlet of the anaerobic ammonia oxidation inner region 2 are restricted. The preferred ammonia nitrogen content of the inlet water is 300 - 750 mg / L, and the ammonia nitrogen content of the outlet water is generally 50 - 150 mg / L (the data is different for different water qualities). The dissolved oxygen in the anaerobic ammonia oxidation inner region 2 is fixed at 0.1 - 0.3 mg / L. When the ammonia nitrogen changes, the aeration volume of the first aerator 5 is adjusted accordingly.

[0048] In one embodiment of the present invention, the supplementary carbon source beyond the raw water is added into the first region 13. If the ammonia nitrogen content in the outer region 1 of simultaneous nitrification and denitrification is higher than 100 mg / L, a carbon source is added to the third region 18 to deeply reduce the ammonia nitrogen.

[0049] In order to further illustrate the present invention, the following combines examples to describe in detail a system and method of anaerobic ammonia oxidation coupled with simultaneous nitrification and denitrification provided by the present invention, but they cannot be understood as limiting the protection scope of the present invention.

[0050] Example 1 A system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification. The main body of the system consists of two carbon steel tanks nested with each other, which are divided into an anaerobic ammonium oxidation inner zone 2 and a simultaneous nitrification and denitrification outer zone 1. The anaerobic ammonium oxidation inner zone 2 is a cylinder (inner diameter 6 m, height 7 m), and the simultaneous nitrification and denitrification outer zone 1 is a cylinder (inner diameter 12 m, height 7 m). The first aerator 5 is a perforated aeration pipe with openings on both sides, and the orientation of the aeration holes is 45° obliquely downward. The second aerator 6 is a membrane microporous aerator, which is controlled by an electric valve. Both the anaerobic ammonium oxidation inner zone 2 and the simultaneous nitrification and denitrification outer zone 1 are equipped with an ammonia nitrogen on-line monitor 11 and a nitrate on-line monitor 12, which can collect the water quality and water volume data of the system in a timely manner and make corresponding adjustments.

[0051] (1)Construction of the packing biofilm in the simultaneous nitrification and denitrification outer zone 1 (2)Operation of the system: In a certain starch wastewater treatment plant, after anaerobic treatment, the COD of the wastewater is 600 mg / L, the ammonia nitrogen is 450 mg / L, and the carbon-nitrogen ratio is unbalanced. If the AO process is used for treatment, a large amount of sludge and carbon dioxide will be produced, which does not meet the requirements of energy conservation and environmental protection. The wastewater is first anaerobically treated, and then the system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification provided in this example is used for nitrogen removal treatment. The wastewater is pumped into the water distributor 4 at the bottom of the anaerobic ammonium oxidation inner zone 2 by a centrifugal pump. The dissolved oxygen in the anaerobic ammonium oxidation inner zone 2 is controlled at 0.1 - 0.3 mg / L, and the pH is greater than 7.5. After the anaerobic ammonium oxidation reaction in the anaerobic ammonium oxidation inner zone 2 (the residence time of the anaerobic ammonium oxidation reaction is 20 hours), the ammonia nitrogen is reduced to 60 mg / L, and the total nitrogen is 130 mg / L. After collecting the water quality and water volume data of the first zone 13 by using the ammonia nitrogen on-line monitor 11 and the nitrate on-line detector 12, part of the raw water from the regulating tank with a COD of 8000 mg / L is introduced into the first zone 13 to supplement the carbon source, and at the same time, the dissolved oxygen in the simultaneous nitrification and denitrification outer zone 1 is adjusted to 0.2 - 0.4 mg / L. Through the simultaneous nitrification and denitrification reaction, the total nitrogen in the second zone 14 of the simultaneous nitrification and denitrification outer zone 1 is reduced to below 35 mg / L. At this time, part of the raw water from the regulating tank is introduced into the third zone 15 again. After the reaction, the total nitrogen of the effluent from the fourth zone 16 is reduced to below 30 mg / L.

[0052] Example 2 A system for anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification is the same as that in Example 1.

[0053] (1)Construction of the packing biofilm in the simultaneous nitrification and denitrification outer zone 1 (2)Operation of the system: For a sewage treatment plant for amino acid wastewater, the influent has a COD of 2500 mg / L and an ammonia nitrogen of 650 mg / L, with an unbalanced carbon-nitrogen ratio. The anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification system is used to treat the wastewater. The wastewater is pumped by a pump into the bottom water distributor 4 of the inner zone 2 of anaerobic ammonium oxidation. The ammonia nitrogen online monitor 11 and the nitrate online detector 12 detect the ammonia nitrogen content, control the dissolved oxygen in the inner zone 2 of anaerobic ammonium oxidation to be 0.2 - 0.3 mg / L, and control the ammonia nitrogen in the effluent from the inner zone 2 of anaerobic ammonium oxidation to be 50 mg / L (by controlling the aeration volume to strengthen or weaken the nitrification reaction, controlling the ammonia nitrogen, controlling the influent volume to increase or decrease the total ammonia nitrogen mass of the system, and thus controlling the ammonia nitrogen concentration (total content) after the reaction). At this time, the total nitrogen in the effluent is about 180 mg / L. After collecting the water quality data of the first zone 101 using the ammonia nitrogen online monitor 11 and the nitrate online detector 12, a part of the bypass raw water from the regulating tank is introduced into the outer zone 1 of simultaneous nitrification and denitrification, and the dissolved oxygen in the first zone 101 and the second zone 102 of the outer zone 1 of simultaneous nitrification and denitrification is adjusted to 0.2 - 0.4 mg / L for the simultaneous nitrification and denitrification reaction. After collecting the water quality data of the third zone 103 using the ammonia nitrogen online monitor 11 and the nitrate online detector 12, a very small amount of bypass raw water from the regulating tank is introduced for advanced denitrification. After the reaction, the total nitrogen in the effluent can be reduced to less than 15 mg / L.

[0054] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification system, characterized in that, Comprising: An anaerobic ammonium oxidation inner zone, at the bottom of which there is a water distributor connected to the water inlet pipe, below the water distributor there is a first aerator, above the water distributor there is a three-phase separator, and above the three-phase separator there are an air outlet and an overflow weir; A simultaneous nitrification and denitrification outer zone, sleeved outside the anaerobic ammonium oxidation inner zone, with packing inside and a second aerator at the bottom; the simultaneous nitrification and denitrification outer zone includes four vertically arranged partition plates, and the four partition plates divide the simultaneous nitrification and denitrification outer zone into four zones, which are, in the water flow direction, the first zone, the second zone, the third zone and the fourth zone in sequence; the overflow weir is connected to the first zone, there are no holes on the partition plate between the first zone and the fourth zone, and there are holes for water flow on the remaining partition plates, and there is a drain outlet in the fourth zone.

2. The system according to claim 1, wherein The anaerobic ammonium oxidation inner zone further includes a reflux pipe, one end of which is arranged between the three-phase separator and the overflow weir, and the other end is connected to the water distributor.

3. The system according to claim 1, characterized in that, The water distributor is a swirl water distributor, composed of a main pipe and a funnel-shaped water distributor.

4. The system according to claim 1, wherein The first aerator is a perforated aeration pipe, with holes on both sides of the aeration pipe, and the orientation of the aeration holes is 45° obliquely downward.

5. The system according to claim 1, wherein The number of layers of the three-phase separator is 1.

6. The system according to claim 1, characterized in that, The anaerobic ammonium oxidation inner zone is also provided with an ammonia nitrogen on-line detector and a nitrate on-line detector.

7. The system according to claim 1, wherein There are holes in the lower part of the partition plate between the first zone and the second zone, holes in the upper part of the partition plate between the second zone and the third zone, and holes in the lower part of the partition plate between the third zone and the fourth zone.

8. The system according to claim 1, wherein There are an ammonia nitrogen on-line detector and a nitrate on-line detector at the water inlet of the first zone.

9. A wastewater treatment method for a system using anaerobic ammonium oxidation coupled with simultaneous nitrification and denitrification, characterized in that, The system of anaerobic ammonium oxidation combined with simultaneous nitrification and denitrification is the system according to any one of claims 1-8, comprising: The wastewater to be treated enters the anaerobic ammonium oxidation inner zone through the water distributor, the first aerator is started, the dissolved oxygen content in the anaerobic ammonium oxidation inner zone is controlled to be 0.1-0.3 mg / L, the wastewater to be treated is mixed with the sludge and flows upward; when the mud-water mixture rises to the three-phase separator, the sludge is intercepted and sinks downward, and the gas and part of the water escape from the air outlet and enter the overflow weir; The purified wastewater enters the first zone from the overflow weir through a pipeline, the oxygen content in the simultaneous nitrification and denitrification outer zone is controlled to be 0.2-0.4 mg / L, a biofilm composed of nitrifying bacteria - anaerobic ammonium oxidation bacteria - denitrifying bacteria is formed on the surface of the packing from the outside to the inside, a carbon source is added to the simultaneous nitrification and denitrification outer zone beyond the raw water, and the purified wastewater flows through the first zone, the second zone and the third zone and then enters the fourth zone and is discharged in the fourth zone.

10. The wastewater treatment method according to claim 9, wherein The ammonia nitrogen concentration of the wastewater to be treated is 300mg / L - 850 mg / L.

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