Partitioned aeration internal circulation up-flow short-cut nitrification coupled with anaerobic ammonia oxidation reaction system and nitrogen removal method

Abstract

The partitioned aeration internal circulation up-flow short-cut nitrification and anaerobic ammonia oxidation reaction system is characterized by simple design structure of the main reactor, the aeration head arranged in the middle of the internal circulation up-flow reactor, the formation of the aerobic region and the anoxic region in the upper part and the lower part of the single reaction zone respectively, the suitable growth environment of the aerobic ammonia oxidation microorganism and the anaerobic ammonia oxidation bacteria in the single reactor, the nitrite produced by the aerobic ammonia oxidation microorganism in the aerobic region of the upper part of the reactor can re-enter the anoxic region of the lower part of the reactor through the internal circulation route of the reaction zone to supply the growth of the anaerobic ammonia oxidation bacteria in the anoxic region, and the improvement of the overall denitrification efficiency of the reactor. The present application belongs to the technical field of wastewater denitrification.

Description

TECHNICAL FIELD

[0001] The present application relates to a short-cut nitrification coupled with anaerobic ammonia oxidation reaction system, in particular to a partitioned aeration internal circulation upflow short-cut nitrification coupled with anaerobic ammonia oxidation reaction system and a denitrification method, and belongs to the technical field of wastewater denitrification. BACKGROUND

[0002] With the development of social economy and the improvement of industrial level, the discharge amount of nitrogen elements in domestic and industrial wastewater is increasing, and the nitrogen elements exceeding the environmental capacity will cause water eutrophication and other environmental problems when entering natural water bodies, so wastewater denitrification is an essential step in the wastewater treatment process. However, the nitrification-denitrification denitrification process commonly used in wastewater treatment plants has the problems of high energy and drug consumption, which does not meet the national energy saving and emission reduction policies.

[0003] As a widely studied anaerobic ammonia oxidation derived process at present, short-cut nitrification coupled with anaerobic ammonia oxidation has the advantages of not needing external carbon source, saving aeration energy consumption and low residual sludge production compared with the traditional nitrification-denitrification process, so it gradually replaces the traditional nitrification-denitrification process for wastewater denitrification. In the past two decades, full-size short-cut nitrification coupled with anaerobic ammonia oxidation process has been applied to the treatment of sludge dewatering liquid, landfill leachate, monosodium glutamate production wastewater and other high-ammonia-nitrogen industrial wastewater, but it is still in the laboratory research stage in the field of mainstream low-ammonia-nitrogen wastewater denitrification. The reason is that under low-ammonia-nitrogen conditions, it is difficult for anaerobic ammonia oxidation bacteria to stably obtain nitrite produced by ammonia oxidation microorganisms as an electron acceptor. The two key functional microorganisms in the short-cut nitrification coupled with anaerobic ammonia oxidation process are aerobic bacteria and anaerobic bacteria, so controlling the dissolved oxygen concentration in the reactor becomes the key to improving the stability of the mainstream short-cut nitrification coupled with anaerobic ammonia oxidation process. SUMMARY

[0004] In order to solve the problem of low and unstable denitrification efficiency of the reactor caused by the difficulty in controlling the dissolved oxygen concentration in the mainstream short-cut nitrification coupled with anaerobic ammonia oxidation process, a partitioned aeration internal circulation upflow short-cut nitrification coupled with anaerobic ammonia oxidation reaction system and a denitrification method are provided.

[0005] The technical solution adopted by the present application to solve the above problems is as follows:

[0006] The present application comprises a reactor body and a matching device, the reactor body is connected with the matching device, the reactor body comprises a water distribution zone, an anoxic reaction zone, an aerobic reaction zone, a three-phase separation zone, an aeration head and a water outlet weir, the water distribution zone, the anoxic reaction zone, the aerobic reaction zone and the three-phase separation zone are connected in sequence from bottom to top, the aeration head is located between the anoxic reaction zone and the aerobic reaction zone, and the upper part of the three-phase separation zone is provided with a water outlet weir.

[0007] Further, the matching device comprises a dissolved oxygen sensor, a water inlet tank, a water outlet tank, an air pump and a peristaltic pump, a water outlet of the water inlet tank is connected with a water inlet at a lower part of the anoxic reaction zone through a connecting pipeline, and the water inlet tank and the anoxic reaction zone are provided with the peristaltic pump on the connecting pipeline; a water outlet of the water weir is connected with a water inlet of the water outlet tank through a connecting pipeline, and the anoxic reaction zone and the aerobic reaction zone are both provided with the dissolved oxygen sensor, and the dissolved oxygen sensor is connected with a dissolved oxygen detector host; and air enters the aerobic reaction zone through the air pump.

[0008] Further, the reactor comprises three internal circulation water flow routes, namely an aerobic reaction zone internal circulation route, an anoxic reaction zone internal circulation route and a total internal circulation route, the total internal circulation route: a sampling port at a top part of the aerobic reaction zone flows out and is supplied to a water inlet at a water distribution area at a bottom part of the reactor through the peristaltic pump; the aerobic reaction zone internal circulation route: the sampling port at the top part of the aerobic reaction zone flows out and enters a bottom water inlet of the aerobic reaction zone through the peristaltic pump; and the anoxic reaction zone internal circulation route: a sampling port at a top part of the anoxic reaction zone flows out and is supplied to a bottom part of the anoxic reaction zone through the peristaltic pump.

[0009] Further, the aerobic reaction zone and the anoxic reaction zone are both loaded with the same number of microbial carriers.

[0010] Further, the microbial carrier is a carbon fiber brush carrier, the carbon fiber brush carrier is composed of carbon fibers and titanium wires, the carrier has a diameter and a height of 2 cm, and the aerobic reaction zone and the anoxic reaction zone each fill ten carbon fiber brush carriers.

[0011] Further, the top part of the aerobic reaction zone, the top part and the bottom part of the anoxic reaction zone are respectively provided with detachable porous baffles.

[0012] The denitrification method of the zoned aeration internal circulation upflow short-cut nitrification coupled with anaerobic ammonia oxidation reaction system comprises the following steps:

[0013] Step one: the reaction system flow is that the wastewater to be treated is first temporarily stored in the water inlet tank,

[0014] Step two: the wastewater is introduced into the zoned aeration internal circulation upflow short-cut nitrification coupled with anaerobic ammonia oxidation reactor through the peristaltic pump from a lower water inlet of the reaction zone, wherein the water inlet flow rate can be adjusted according to requirements;

[0015] Step three: finally, the treated wastewater flows into the water outlet tank through the pipeline after passing through the three-phase separation zone and the water weir, and the whole operation flow is completed.

[0016] Further, the dissolved oxygen concentration of the aerobic reaction zone 3 is 0.3-0.5 mg / L; and the dissolved oxygen concentration of the anoxic reaction zone 2 is 0-0.2 mg / L.

[0017] The beneficial effects of the present application are:

[0018] 1. The main reactor design structure is simple, by setting the aeration head in the middle of the internal circulation upflow reactor, the aerobic area and the anoxic area are formed in the upper part and the lower part of the single reaction zone respectively, so that the aerobic ammonia oxidation microorganisms and the anaerobic ammonia oxidation bacteria have suitable growth environment in the single reactor;

[0019] 2. The nitrite produced by the aerobic ammonia oxidation microorganisms in the aerobic area of the upper part of the reactor can re-enter the anoxic area of the lower part of the reactor through the internal circulation route in the reaction zone to supply the growth of the anaerobic ammonia oxidation bacteria therein, thereby improving the overall denitrification efficiency of the reactor;

[0020] 3. The aerobic area and the anoxic area of the reactor are both provided with dissolved oxygen probes, and the dissolved oxygen concentrations in different areas can be adjusted by adjusting the aeration flow and the internal circulation ratio, so that the reactor can flexibly adjust the aeration flow and the internal circulation ratio according to the needs to ensure the denitrification efficiency and stability when facing different nitrogen loads;

[0021] 4. The microbial carriers filled in the aerobic area and the anoxic area can promote the formation of biofilm, and the three internal circulation routes in the reactor can provide high water flow velocity to promote the formation of granular sludge. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the schematic diagram of the partitioned aeration internal circulation upflow short-cut nitrification coupled anaerobic ammonia oxidation reaction system of the present application.

[0023] Figure 2 is the longitudinal section schematic diagram of the partitioned aeration internal circulation upflow reactor of the present application. DETAILED DESCRIPTION

[0024] Specific implementation mode one: combining Figure 1 and Figure 2 The present embodiment is described, the partitioned aeration internal circulation upflow short-cut nitrification coupled anaerobic ammonia oxidation reaction system of the present embodiment includes a reactor main body and a matching device, the reactor main body is connected with the matching device thereof, the reactor main body includes a water distribution area 1, an anoxic reaction area 2, an aerobic reaction area 3, a three-phase separation area 4, an aeration head 5 and a water outlet weir 6, the water distribution area 1, the anoxic reaction area 2, the aerobic reaction area 3 and the three-phase separation area 4 are connected in turn from bottom to top, the aeration head 5 is located between the anoxic reaction area 2 and the aerobic reaction area 3, and the upper part of the three-phase separation area is provided with the water outlet weir 6.

[0025] The reaction zone is divided into aerobic reaction zone 3 and anoxic reaction zone 2 according to the position. The aerobic reaction zone 3 is the part above the aeration head 5. Since the bubbles generated by the aeration head 5 rise, the dissolved oxygen supply in this area is relatively sufficient, and the aerobic ammonia oxidation microorganisms are mainly enriched. The anoxic reaction zone 2 is located below the aeration head 5. The dissolved oxygen in the lower part of the reaction zone mainly comes from the internal circulation and the influent, so the dissolved oxygen supply is relatively less, and the anaerobic ammonia oxidation bacteria are mainly enriched.

[0026] Specific embodiment two: combination Figure 1 and Figure 2 To illustrate this embodiment, the complete equipment in this embodiment includes a dissolved oxygen sensor 7, an influent tank 8, an effluent tank 9, an air pump 10 and a peristaltic pump 11. The effluent outlet of the influent tank 8 is connected with the influent port of the lower part of the anoxic reaction zone 2 through a connecting pipeline. The connecting pipeline between the influent tank 8 and the anoxic reaction zone 2 is provided with the peristaltic pump 11. The effluent outlet of the effluent weir 6 is connected with the influent port of the effluent tank 9 through a connecting pipeline. The dissolved oxygen sensor 7 is installed in the anoxic reaction zone 2 and the aerobic reaction zone 3. The dissolved oxygen sensor 7 is connected with a dissolved oxygen detector host. Air enters the aerobic reaction zone 3 through the air pump 10.

[0027] The dissolved oxygen sensor 7 can obtain the dissolved oxygen concentration in different areas. Air is input into the reactor by the air pump, diffused into tiny bubbles in the solution by the aeration head, and supplied for the aerobic ammonia oxidation microorganisms to use. At the same time, the air flow can be adjusted according to the needs. The excess air is discharged from the top air hole of the reactor through the three-phase separation zone.

[0028] The other components and connection relationships of this embodiment are the same as those of specific embodiment one.

[0029] Specific embodiment three: combination Figure 1 and Figure 2 To illustrate this embodiment, the reactor in this embodiment contains three internal circulation water flow routes, namely the aerobic reaction zone internal circulation route 3-1, the anoxic reaction zone internal circulation route 2-1 and the total internal circulation route 1-1. The total internal circulation route 1-1: the first sampling port at the top of the aerobic reaction zone 3 flows out and is supplied to the water distribution area 1 influent port at the bottom of the reactor through the peristaltic pump. This circulation route mainly returns the nitrite produced by the aerobic ammonia oxidation microorganisms in the aerobic reaction zone solution to the anoxic reaction zone for the anaerobic ammonia oxidation bacteria to use.

[0030] The internal circulation route 3-1 in the aerobic reaction zone: from the sampling port at the top of the aerobic reaction zone 3, through the peristaltic pump into the water inlet at the bottom of the aerobic reaction zone 3. The internal circulation route 1-1 in the anoxic reaction zone: from the sampling port at the top of the anoxic reaction zone 2, through the peristaltic pump to the bottom of the anoxic reaction zone. The main purpose of the internal circulation in the aerobic reaction zone and the anoxic reaction zone is to agitate the water flow in the region and promote the formation of short-cut nitrification coupled with ANAMMOX granular sludge in the region.

[0031] The other components and connection relationships of the embodiment are the same as those of embodiment one or two.

[0032] Embodiment four: combination Figure 1 In this embodiment, the same number of microbial carriers are loaded in the aerobic reaction zone 3 and the anoxic reaction zone 2.

[0033] The other components and connection relationships of the embodiment are the same as those of embodiment one, two or three.

[0034] Embodiment five: combination Figure 1 In this embodiment, the microbial carrier is a carbon fiber brush carrier, which is composed of carbon fiber and titanium wire, and the diameter and height of the carrier are both 2 cm. The aerobic reaction zone 3 and the anoxic reaction zone 2 are each filled with 10 carbon fiber brush carriers. The purpose of loading the microbial carrier is to promote the formation of short-cut nitrification coupled with ANAMMOX biofilm on its surface and to increase the biomass in the reactor. The carrier can be selected according to the needs, and the carbon fiber brush carrier is recommended. The volume of the filled carrier can fluctuate between 10-50% of the volume of the reaction zone, and the filling ratio can be selected according to the needs.

[0035] The other components and connection relationships of the embodiment are the same as those of embodiment one, two, three or four.

[0036] Embodiment six: combination Figure 1 In this embodiment, the top of the aerobic reaction zone 3, the top and the bottom of the anoxic reaction zone 2 are respectively provided with detachable porous baffles.

[0037] The function of the baffle is to intercept the microbial carriers in the fixed area, while allowing the water flow in the reactor to flow freely. The diameter of the baffle is consistent with the inner diameter of the reaction zone, and the diameter of the small holes in the baffle is 0.5 cm.

[0038] The other components and connection relationships of the embodiment are the same as those of embodiment one, two, three, four or five.

[0039] Embodiment seven: combination Figure 1The denitrification method of the partitioned aeration internal circulation up-flow short-cut nitrification coupled with ANAMMOX reaction system in the embodiment is described as follows:

[0040] Step one: the flow of the reaction system is that the wastewater to be treated is first temporarily stored in the influent tank,

[0041] Step two: the wastewater is introduced into the partitioned aeration internal circulation up-flow short-cut nitrification coupled with ANAMMOX reactor through the peristaltic pump from the influent port at the lower part of the reaction zone, wherein the influent flow rate can be adjusted according to the requirements;

[0042] Step three: finally, the treated wastewater is introduced into the effluent tank through the pipeline after passing through the three-phase separation zone and the effluent weir, and the whole operation process is completed.

[0043] Liquid samples are taken from the effluent tank at regular time every day, and the water quality parameters are determined to monitor the denitrification effect of the system.

[0044] The inoculums in the reactor start-up process are pre-enriched ANAMMOX sludge and activated sludge, wherein the activated sludge obtained from the sewage treatment plant first needs to be filtered through a screen to remove impurities, and then the activated sludge and the pre-enriched ANAMMOX sludge are washed three times with a phosphate buffer solution. Next, the two kinds of sludge are allowed to settle by sedimentation, and are concentrated to the required sludge concentration. Finally, a certain amount of the two kinds of inoculated sludge is mixed and equally divided into two halves, which are respectively added to the aerobic reaction zone and the anoxic reaction zone of the reactor. After the inoculation of the reactor is completed, the influent and the internal circulation of the reactor are closed, and the reactor is allowed to stand for 24 hours to facilitate the adsorption of microorganisms on the surface of the carrier. Then, the influent flow rate and the internal circulation are set to a low value, and the nitrogen concentration in the effluent is monitored every day. When the nitrogen concentration in the effluent meets the first level A standard in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002)", it indicates that the reactor start-up is successful. During the subsequent operation of the reaction system, the influent flow rate is continuously increased to increase the operating load of the reactor.

[0045] The other components and connection relationships of the embodiment are the same as those of the first, second, third, fourth or fifth embodiment.

[0046] Specific embodiment eight: combination Figure 1 and Figure 2 In the embodiment, the dissolved oxygen concentration in the aerobic reaction zone 3 is 0.3-0.5 mg / L, and the dissolved oxygen concentration in the anoxic reaction zone 2 is 0-0.2 mg / L.

[0047] When facing high influent ammonia nitrogen load shock, the dissolved oxygen concentration can be appropriately increased. When the dissolved oxygen concentration exceeds the threshold value during the operation, the aeration is stopped, and when the dissolved oxygen concentration is below the threshold value, the air pump flow rate is increased. After the reactor is inoculated for two weeks, the internal circulation pump flow rate is increased to ensure that the up-flow velocity in the reaction zone is 5 m / h.

[0048] The other components and connection relationships of the present embodiment are the same as those of Embodiments One, Two, Three, Four, Five, Six, or Seven.

[0049] Example 1

[0050] The specific operation steps are as follows:

[0051] First, the partitioned aeration internal circulation upflow short-cut nitrification and anaerobic ammonia oxidation reaction system was made. The main reactor was made of organic glass, and from bottom to top, it was water distribution zone 1, anoxic reaction zone 2, aerobic reaction zone 3, and three-phase separation zone 4. The total volume of the reactor was 900 ml, in which the volume of the conical water distribution zone 1 was 17 ml, the volume of the cylindrical reaction zone was 402 ml, and the volume of the top three-phase separation zone 4 was 481 ml. The inner diameter of the cylindrical reaction zone was 4 cm, the total height was 32 cm, and the height-diameter ratio of the reaction zone was 8:1. The aeration head 5 was located in the middle of the vertical direction of the reaction zone, i.e. 16 cm away from the bottom of the reaction zone. The aeration head 5 was disc-shaped with a diameter of 2 cm, and the upward-facing side of the aeration head 5 could produce bubbles. Carbon fiber brushes were loaded as microbial carriers in the aerobic reaction zone and the anoxic reaction zone of the main reactor, and the carbon fiber brush carriers were composed of carbon fiber and titanium wire, with a diameter and height of 2 cm. There were 10 carbon fiber brush carriers in each of the aerobic reaction zone and the anoxic reaction zone. The water inlet tank and the water outlet tank were made of organic glass and had a cylindrical structure with a volume of 785 ml each. Then, the pipeline was connected by a peristaltic pump tube, the water outlet at the bottom of the water inlet tank was connected to the water inlet at the bottom of the anoxic zone, and the U-shaped water outlet pipe of the reactor was connected to the water outlet tank.

[0052] Then, artificial synthetic wastewater was configured for simulating mainstream wastewater. The artificial synthetic wastewater was composed of nitrogen culture medium and trace element solution. The nitrogen culture medium contained KHCO3 (1.80 g / L), NaH2PO4 (0.06 g / L), CaCl2 (0.15 g / L), MgSO4 (0.15 g / L), and NH4Cl (0.27 g / L), and the trace element solution included ZnSO4·7H2O (0.43 g / L), CoCl2·6H2O (0.24 g / L), MnCl2·4H2O (0.99 g / L), CuSO4·5H2O (0.25 g / L), NiCl2·6H2O (0.19 g / L), H3BO4 (0.014 g / L), NaSeO4·10H2O (0.21 g / L), NaMoO4·2H2O (0.22 g / L), NaWO4·2H2O (0.05 g / L), FeSO4 (5 g / L), and EDTA (5 g / L). The prepared nitrogen culture medium was added with the trace element solution at a ratio of 1.5 ml / L, and the pH was adjusted to 7.5-8. After stirring uniformly, the solution was poured into the water inlet tank.

[0053] Next, the start-up and operation of the reaction system. The inoculum during the start-up process is pre-enriched anammox sludge and activated sludge. The activated sludge obtained from a sewage treatment plant first needs to be filtered through a screen to remove impurities, and then the activated sludge and the pre-enriched anammox sludge are washed three times with a phosphate buffer solution. After standing and settling, the sludge concentrations of the activated sludge and the pre-enriched anammox sludge are 6.74 g / L and 13.46 g / L, respectively. After completely mixing 5 ml of activated sludge and 10 ml of pre-enriched anammox sludge, 7.5 ml is added to the aerobic reaction zone and the anoxic reaction zone, respectively. The hydraulic retention time is set to one day, the dissolved oxygen concentration in the aerobic reaction zone is set to 0.3-0.5 mg / L, and the dissolved oxygen concentration in the anoxic reaction zone is set to 0-0.2 mg / L. The upflow velocity in the reaction zone is 5 m / h.

[0054] Finally, the denitrification effect is monitored. The results show that the reactor completes the start-up of the short-cut nitrification coupled with anammox process on the 16th day, and the ammonia nitrogen and total nitrogen concentrations in the effluent meet the first level A standard in the "Urban Sewage Treatment Plant Pollutant Discharge Standard (GB 18918-2002)". On the 110th day of the reactor operation, microbial samples were taken from the reactor, and the microbial community structure analysis showed that a short-cut nitrification coupled with anammox community was formed in the reactor, with a relative abundance of anammox bacteria as high as 35.96%.

[0055] Example 2:

[0056] The ordinary upflow short-cut nitrification coupled with anammox reaction system is used for main stream wastewater denitrification, and the specific operation steps are as follows:

[0057] First, the ordinary upflow short-cut nitrification coupled with anammox reaction system is made. As a control implementation, the partition aeration design and internal circulation design are cancelled in the main reactor configuration, the aeration head is directly installed at the bottom of the reaction zone, and the internal circulation of the reactor is cancelled. The rest of the ordinary upflow short-cut nitrification coupled with anammox reaction system and the specific embodiment 1 are consistent.

[0058] The artificial synthetic wastewater formula of the reaction system is also consistent with that in the specific embodiment 1.

[0059] The start-up and operation of the reaction system part, due to the lack of partition aeration design, the dissolved oxygen concentration in the entire reaction zone is set to 0.3-0.5 mg / L, and due to the lack of internal circulation process, the water flow upflow velocity in the reactor cannot be maintained and is the same as in the specific embodiment 1. The rest of the operation and the specific embodiment 1 are consistent.

[0060] Finally, the denitrification effect was monitored. The results show that the reactor completed the start-up of the short-cut nitrification coupled with ANAMMOX process on the 35th day, and the nitrate concentration in the effluent was high, and only the ammonia nitrogen concentration in the effluent met the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).

[0061] Through comparison of the two embodiments, it can be found that the partitioned aeration internal circulation up-flow short-cut nitrification coupled with ANAMMOX reaction system not only accelerates the start-up of the short-cut nitrification coupled with ANAMMOX process, but also ensures high denitrification efficiency, and strengthens the enrichment of ANAMMOX bacteria. The design has guiding significance for application of the short-cut nitrification coupled with ANAMMOX process to mainstream wastewater denitrification.

[0062] The above specific embodiments are only for verification design, and other embodiments similar to the spirit, principle, and reactor configuration of the present application are also included in the protection scope of the present application.

[0063] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution range of the present application, and the equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent replacement, and improvement of the above embodiments, which do not depart from the technical solution content of the present application, are within the protection scope of the present application.

Claims

1. A partitioned aeration internal circulation up-flow short-cut nitrification coupled with anaerobic ammonia oxidation reaction system, comprising a reactor main body and a matching device, the reactor main body being connected with the matching device, the reactor main body comprising a water distribution zone (1), an anoxic reaction zone (2), an aerobic reaction zone (3), a three-phase separation zone (4), an aeration head (5) and a water outlet weir (6), the water distribution zone (1), the anoxic reaction zone (2), the aerobic reaction zone (3) and the three-phase separation zone (4) being connected in sequence from bottom to top, and the upper part of the three-phase separation zone being provided with the water outlet weir (6); characterized in that: The height-diameter ratio of the reaction zone is 8:1; the aeration head (5) is installed in the middle of the reactor body between the anoxic reaction zone (2) and the aerobic reaction zone (3), and the dissolved oxygen concentration in the aerobic reaction zone (3) is 0.3-0.5 mg / L; the reactor body comprises three internal circulation water flow routes, namely, a total internal circulation route (1-1) that returns from the top of the aerobic reaction zone (3) to the water distribution zone (1) inlet at the bottom of the reactor, an aerobic reaction zone internal circulation route (3-1) that returns from the top of the aerobic reaction zone (3) to the bottom inlet of the aerobic reaction zone (3), and an anoxic reaction zone internal circulation route (2-1) that returns from the top of the anoxic reaction zone (2) to the bottom of the anoxic reaction zone (2). ​ 2. The partitioned aeration internal circulation up-flow partial nitrification coupled with ANAMMOX reaction system according to claim 1, characterized in that: The complete equipment comprises a dissolved oxygen sensor (7), a water inlet tank (8), a water outlet tank (9), an air pump (10) and a peristaltic pump (11), the water outlet of the water inlet tank (8) is connected to the water inlet at the lower part of the anoxic reaction zone (2) through a connecting pipeline, the connecting pipeline between the water inlet tank (8) and the anoxic reaction zone (2) is provided with the peristaltic pump (11); the water outlet of the water weir (6) is connected to the water inlet of the water outlet tank (9) through a connecting pipeline, the anoxic reaction zone (2) and the aerobic reaction zone (3) are each provided with the dissolved oxygen sensor (7), and the dissolved oxygen sensor (7) is connected to a dissolved oxygen measuring instrument host; air enters the aerobic reaction zone (3) through the air pump (10).

3. The partitioned aeration internal circulation upflow short-cut nitrification coupled ANAMMOX reaction system according to claim 1, characterized in that: The reactor comprises three internal circulation water flow routes, namely, an aerobic reaction zone internal circulation route (3-1), an anoxic reaction zone internal circulation route (2-1) and a total internal circulation route (1-1), the total internal circulation route (1-1) returns from the sampling port at the top of the aerobic reaction zone (3) to the water distribution zone (1) inlet at the bottom of the reactor through the peristaltic pump (11); the aerobic reaction zone internal circulation route (3-1) returns from the sampling port at the top of the aerobic reaction zone (3) to the bottom inlet of the aerobic reaction zone (3) through the peristaltic pump (11); and the anoxic reaction zone internal circulation route (2-1) returns from the sampling port at the top of the anoxic reaction zone (2) to the bottom of the anoxic reaction zone (2) through the peristaltic pump (11).

4. The zone aeration internal circulation up-flow partial nitrification coupled ANAMMOX reaction system according to claim 1, characterized in that: The aerobic reaction zone (3) and the anoxic reaction zone (2) are each loaded with the same number of microbial carriers.

5. The partitioned aeration internal circulation upflow short-cut nitrification coupled with ANAMMOX reaction system according to claim 4, characterized in that: The microbial carrier is a carbon fiber brush carrier, which is composed of carbon fibers and titanium wires, and the aerobic reaction zone (3) and the anoxic reaction zone (2) are each filled with ten carbon fiber brush carriers.

6. The zone aeration internal circulation upflow short-cut nitrification coupled ANAMMOX reaction system according to claim 1, characterized in that: The top of the aerobic reaction zone (3), the top and the bottom of the anoxic reaction zone (2) are respectively provided with detachable porous baffles.

7. The denitrification method based on the partitioned aeration internal circulation upflow shortcut nitrification coupled with ANAMMOX reaction system according to any one of claims 1-6, characterized in that: The denitrification method comprises the following steps: Step one: making a partitioned aeration internal circulation up-flow short-cut nitrification coupled anaerobic ammonia oxidation reaction system: the reactor body comprises, from bottom to top, a water distribution zone 1, an anoxic reaction zone 2, an aerobic reaction zone 3 and a three-phase separation zone 4, the height-diameter ratio of the reaction zone is 8:1, Step two: configuration of synthetic wastewater for simulating mainstream wastewater: synthetic wastewater is composed of nitrogen medium and trace element solution, the nitrogen medium contains 1.80 g / L of KHCO3, 0.06 g / L of NaH2PO4, 0.15 g / L of CaCl2, 0.15 g / L of MgSO4 and 0.27 g / L of NH4Cl, the trace element solution contains 0.43 g / L of ZnSO4·7H2O, 0.24 g / L of CoCl2·6H2O, 0.99 g / L of MnCl2·4H2O, 0.25 g / L of CuSO4·5H2O, 0.19 g / L of NiCl2·6H2O, 0.014 g / L of H3BO4, 0.21 g / L of NaSeO4·10H2O, 0.22 g / L of NaMoO4·2H2O, 0.05 g / L of NaWO4·2H2O, 5 g / L of FeSO4 and 5 g / L of EDTA; the prepared nitrogen medium is added with trace element solution at a ratio of 1.5 ml / L, and the pH is adjusted to 7.5-8, then it is stirred uniformly and poured into the water tank; Step three: start and run the reaction system: the inoculum in the start-up process is pre-enriched anammox sludge and activated sludge, after the activated sludge is allowed to stand and settle, the sludge concentrations of the pre-enriched anammox sludge and the activated sludge are 6.74 g / L and 13.46 g / L respectively; 5 ml of activated sludge and 10 ml of pre-enriched anammox sludge are completely mixed, and then 7.5 ml of the mixture is added into the aerobic reaction zone and the anoxic reaction zone respectively; the parameter setting is that the hydraulic retention time is one day, the dissolved oxygen concentration in the aerobic reaction zone is set to 0.3-0.5 mg / L, and the dissolved oxygen concentration in the anoxic reaction zone is set to 0-0.2 mg / L; the upflow velocity in the reaction zone is 5 m / h; Step four: the wastewater to be treated is first temporarily stored in the water tank (8), and then enters the short-cut nitrification and anammox reactor through the peristaltic pump (11) from the lower inlet of the reaction zone for reaction, wherein the inlet flow rate is adjusted according to the requirement; finally, the treated wastewater flows into the water tank (9) through the three-phase separation zone (4) and the outlet weir (6) through the pipeline, and the whole operation process is completed; Step five: monitor the denitrification effect.

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