Device and method for short-cut nitrification / anaerobic ammonia oxidation high-speed denitrification of low-ammonia-nitrogen wastewater in tropical region

Abstract

The invention provides a device and a method for short-cut nitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia-nitrogen wastewater in a tropical region, belongs to the technical field of biological sewage treatment, and is used for treating the low-ammonia-nitrogen wastewater in the tropical region. The device comprises a water inlet tank, a double-zone bioreactor and a water collecting tank. The method comprises the following steps: pre-treating floc sludge in a reactor by adding hydroxylamine and controlling sludge age, so as to keep the activity of ammonia oxidizing bacteria and inhibit the activity of nitrite oxidizing bacteria at the same time; after pretreatment, anaerobic ammonia oxidation granular sludge is inoculated into the reactor, and aeration is performed at the upper part of the reactor to provide an aerobic environment for ammonia oxidizing bacteria in floc sludge; the granular sludge is settled at the lower part of the reactor, and nitrite generated by floc sludge at the upper part flows back to the lower part, so that anaerobic ammonia oxidation denitrification is realized. The two functional microorganisms are placed in respective appropriate environments, so that the growth of nitrite oxidizing bacteria can be controlled, the short-cut nitrification / anaerobic ammonia oxidation rate is increased, and the high-rate denitrification of the low-ammonia-nitrogen wastewater is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of biological wastewater treatment, and in particular, relates to a device and method for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation. Background Art

[0002] At present, most urban sewage treatment plants generally use traditional biological denitrification technology. However, these technologies generally face the following problems: first, high energy consumption, which is particularly prominent in the context of increasingly tight energy supply; second, large land area, because the denitrification rate of traditional sewage treatment plants is relatively low and the treatment time required is long.

[0003] Short-cut nitrification / anaerobic ammonium oxidation (PN / A) for low-ammonia wastewater is a low-carbon and low-energy denitrification technology, but the application of this technology still faces the following challenges: First, there is a conflict between the demand for dissolved oxygen by ammonia-oxidizing bacteria (AOB) and anaerobic ammonium-oxidizing bacteria (AnAOB), which limits the rate of anaerobic ammonium oxidation when supplying oxygen for short-cut nitrification. Second, it is difficult to effectively inhibit the growth of nitrite-oxidizing bacteria (NOB) while stably achieving the short-cut nitrification process, resulting in reduced denitrification efficiency.

[0004] How to achieve stable control of NOB and realize high-rate denitrification of low-ammonia nitrogen wastewater by short-range nitrification / anaerobic ammonia oxidation is of great significance to the synergistic improvement of pollution reduction and carbon reduction in my country. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation, which can exert the potential of two functional microorganisms while effectively inhibiting the growth of NOB and achieving high-rate denitrification.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions: A method for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation comprises the following steps: inputting low-ammonia nitrogen wastewater from an inlet tank into a dual-zone bioreactor through an inlet peristaltic pump, adding inoculated flocculent sludge to the dual-zone bioreactor, adding hydroxylamine in a pretreatment stage, starting an aeration pump to continuously aerate the sludge through an aeration head and controlling a relatively short sludge age; adding inoculated granular sludge to the dual-zone bioreactor, aerating the upper part of the dual-zone bioreactor by using an aeration pump and an aeration head; starting a reflux peristaltic pump to reflux the mixture at the top through a reflux valve through a bottom water inlet into the granular sludge at the lower part of the dual-zone bioreactor; discharging part of the flocculent sludge through a sludge discharge valve; and connecting the treated water to a water collecting tank through an outlet valve for drainage.

[0007] As one of the preferred technical solutions, in the present invention, the operation of adjusting during operation is as follows: 1) First, inoculate the flocculent sludge into the dual-zone bioreactor, and control the sludge concentration at 3000mg / L~3500mg / L; 2) Enter the pretreatment stage, start the water inlet peristaltic pump, pump the low ammonia nitrogen wastewater with a concentration of 35.0mg / L~55.0mg / L in the water inlet tank into the water inlet valve of the dual-zone bioreactor, and add hydroxylamine at the same time to control the hydroxylamine concentration in the dual-zone bioreactor to 5mg / L; 3) Start the aeration pump to continuously aerate the sludge through the aeration head for 1 hour, and control the dissolved oxygen concentration of the dual-zone bioreactor to 4mg / L~6mg / L; after the aeration stage is completed, wash the sludge after the flocculent sludge is settled; 4) Repeat steps 2) to 3) for a pretreatment period of 7 days, during which 1 / 2 of the reaction volume of sludge is discharged every day, and the sludge age is controlled to be 2 days; 5) Inoculate the anaerobic ammonium oxidation granular sludge into the above-mentioned dual-zone bioreactor, and control the granular sludge concentration at 5000mg / L-9000mg / L; 6) Start the water inlet peristaltic pump and pump the low-ammonia nitrogen wastewater with a concentration of 35.0mg / L~55.0mg / L in the water inlet tank into the water inlet valve of the dual-zone bioreactor; 7) After the water inflow is completed, start the reflux peristaltic pump, and return the top mixture through the bottom water inlet to the lower granular sludge through the reflux valve of the dual-zone bioreactor. At the same time, start the aeration pump and aeration head, and control the dissolved oxygen concentration in the upper part of the dual-zone bioreactor to 0.01mg / L~0.5mg / L through the upper sensor and upper dissolved oxygen detection instrument; 8) The aerobic stage is 60 minutes to 25 minutes. The aeration time is adjusted according to the effluent ammonia nitrogen concentration, which is 2mg / L~3mg / L. 9) 5 minutes before the end of aeration, discharge part of the floc sludge through the sludge discharge valve to control the sludge age of the floc sludge to 1 to 3 days; 10) After the floc sludge settles for 10 minutes, the treated water is connected to the water collection tank through the outlet valve for drainage. The drainage volume accounts for 60% to 65% of the total volume of the reactor. 11) Repeat steps 6) to 10) and operate the dual-zone bioreactor in a batch processing mode to achieve short-range nitrification / anaerobic ammonium oxidation high-rate denitrification based on stable NOB control.

[0008] A device for short-range nitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas comprises an inlet tank, a dual-zone bioreactor and a water collecting tank which are connected in sequence, wherein the inlet tank is connected to the inlet valve of the dual-zone bioreactor, and the dual-zone bioreactor is connected to the water collecting tank via an outlet valve.

[0009] As one of the preferred technical solutions, in the present invention, the water inlet tank is provided with a first drain valve.

[0010] As one of the preferred technical solutions, in the present invention, the dual-zone bioreactor is equipped with an inlet peristaltic pump, an inlet valve, a reflux peristaltic pump, a reflux valve, a bottom water inlet, a mud discharge valve, an outlet valve, an upper sensor, an upper dissolved oxygen detection instrument, a lower sensor, a lower dissolved oxygen detection instrument, an aeration head, a gas flow meter, and an aeration pump.

[0011] As one of the preferred technical solutions, in the present invention, the water collecting tank is provided with a second drain valve.

[0012] As one of the preferred technical solutions, in the present invention, the reflux valve is connected to the bottom water inlet, and a reflux peristaltic pump is arranged in the middle.

[0013] As one of the preferred technical solutions, in the present invention, the upper sensor is connected to the upper dissolved oxygen detection instrument, and the lower sensor is connected to the lower dissolved oxygen detection instrument to display the dissolved oxygen concentration in real time.

[0014] As one of the preferred technical solutions, in the present invention, the aeration pump is connected to the gas flow meter and the aeration head in sequence.

[0015] A device for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation comprises an inlet tank, a dual-zone bioreactor and a water collecting tank, wherein the inlet tank is provided with a first vent valve, the dual-zone bioreactor is provided with an inlet peristaltic pump, an inlet valve, a reflux peristaltic pump, a reflux valve, a bottom water inlet, a mud discharge valve, an outlet valve, an upper sensor, an upper dissolved oxygen detection instrument, a lower sensor, a lower dissolved oxygen detection instrument, an aeration head, a gas flow meter and an aeration pump; the water collecting tank is provided with a second vent valve, the reflux valve is connected to the bottom water inlet, and a reflux peristaltic pump is arranged in the middle; the upper sensor is connected to the upper dissolved oxygen detection instrument, and the lower sensor is connected to the lower dissolved oxygen detection instrument; the aeration pump is connected to the gas flow meter and the aeration head in sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a method for effectively inhibiting NOB activity and maintaining the stability of a short-range nitrification / anaerobic ammonium oxidation system, thereby saving aeration energy consumption and reagent costs.

[0017] (2) The present invention provides a method for high-rate denitrification in a short-range nitrification / anaerobic ammonium oxidation process in low-ammonia nitrogen wastewater, thereby shortening the treatment time.

[0018] (3) The present invention adopts a dual-zone bioreactor with a relatively large aspect ratio, which helps to reduce the system footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the device for short-range nitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to the present invention.

[0020] In the figure: 1. water inlet tank; 2. dual-zone bioreactor; 3. water collecting tank; 11. first vent valve; 21. water inlet peristaltic pump; 22. water inlet valve; 23. reflux peristaltic pump; 24. reflux valve; 25. bottom water inlet; 26. mud discharge valve; 27. water outlet valve; 28. upper sensor; 29. ​​upper dissolved oxygen detection instrument; 210. lower sensor; 211. lower dissolved oxygen detection instrument; 212. aeration head; 213. gas flow meter; 214. aeration pump; 31. second vent valve. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] The method of the present invention effectively inhibits the growth of NOB by adding hydroxylamine during the pretreatment process and controlling the relatively short sludge age, and maintains the activity of AOB to stably realize short-range nitrification. By utilizing the difference in sedimentation performance, flocs and particles are separated in the dual-zone bioreactor 2, and aeration treatment is performed at the upper part of the dual-zone bioreactor 2 through an aeration pump 214 and an aeration head 212, providing an aerobic environment for the growth of AOB in the floc sludge, oxidizing ammonia nitrogen into nitrite nitrogen, and controlling the growth of NOB in the floc sludge by controlling the relatively short floc sludge age, the relatively high ammonia nitrogen concentration at the upper part of the dual-zone bioreactor 2, and the low dissolved oxygen environment; the anaerobic ammonia oxidation granular sludge is sunk to the lower part of the dual-zone bioreactor 2, and the anaerobic ammonia oxidation denitrification is realized by returning the nitrite nitrogen generated by the upper floc sludge to the lower part.

[0023] The present invention creatively solves the technical difficulties of conflicting demands for dissolved oxygen between AOB bacteria and AnAOB bacteria, and effectively inhibiting the activity of NOB bacteria to achieve a stable short-range nitrification process on the basis of simple control and convenient operation.

[0024] Example 1

[0025] like Figure 1 As shown, a device for short-range nitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas comprises an inlet tank 1, a dual-zone bioreactor 2, and a water collecting tank 3 connected in sequence, wherein the inlet tank 1 is connected to the dual-zone bioreactor 2 via an inlet peristaltic pump 21, and the dual-zone bioreactor 2 is connected to the water collecting tank 3 via an outlet valve 27.

[0026] The water inlet tank 1 is equipped with a first vent valve 11, the dual-zone bioreactor 2 is equipped with an inlet peristaltic pump 21, an inlet valve 22, a reflux peristaltic pump 23, a reflux valve 24, a bottom water inlet 25, a mud discharge valve 26, a water outlet valve 27, an upper sensor 28, an upper dissolved oxygen detection instrument 29, a lower sensor 210, a lower dissolved oxygen detection instrument 211, an aeration head 212, a gas flow meter 213, and an aeration pump 214, and a second vent valve 31 is arranged on the water collecting tank 3.

[0027] The working method of the above-mentioned device for short-range denitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas is as follows: low-ammonia nitrogen wastewater is input into the dual-zone bioreactor 2 from the water inlet tank 1 through the water inlet peristaltic pump 21, and the inoculated flocculent sludge is added to the dual-zone bioreactor 2. In the pretreatment stage, hydroxylamine is added, the aeration pump 214 is started to continuously aerate the sludge through the aeration head 212 and control the sludge age to be relatively short; the inoculated granular sludge is added to the dual-zone bioreactor 2, and the aeration pump 214 and the aeration head 212 are used to aerate the upper part of the dual-zone bioreactor 2; the reflux peristaltic pump 23 is started, and the mixture at the top is refluxed to the granular sludge at the lower part of the dual-zone bioreactor 2 through the bottom water inlet 25 through the reflux valve 24; part of the flocculent sludge is discharged through the sludge discharge valve 26; the treated water is connected to the water collection tank 3 through the outlet valve 27 for drainage.

[0028] Example 2

[0029] A method for high-speed denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonium oxidation, using the device for high-speed denitrification of low-ammonia nitrogen wastewater in tropical areas described in Example 1. During the test of this method, the synthetic wastewater components include: 450mg / L NaHCO3, 18mg / L KH2PO4, 14mg / L CaCl2·2H2O, 90mg / LMgSO4·7H2O and 1.25mg / L trace elements. Trace element solution A contains: 5g / L EDTA and 22g / L FeSO4. During the whole experiment, Fe 2+ The concentration was maintained at 0.08 mM. Trace element solution B contained: 15 g / L EDTA, 0.014 g / L H3BO4, 0.19 g / L NiCl2·6H2O, 0.22 g / L NaMoO4·2H2O, 0.25 g / L CuSO4·5H2O, 0.99 g / L MnCl2·4H2O, and 0.43 g / L ZnSO4·7H2O.

[0030] Test equipment such as Figure 1 As shown, each reactor is made of acrylic material, and the effective volume of the dual-zone bioreactor 2 is 5L.

[0031] In the present invention, the runtime adjustment operation is as follows: (1) First, the flocculent sludge was inoculated into the 5L dual-zone bioreactor 2, and the sludge concentration was 3500 mg / L.

[0032] (2) Entering the pretreatment stage, the water inlet peristaltic pump 21 is started to pump the 45 mg / L low-ammonia nitrogen wastewater in the water inlet tank 1 into the dual-zone bioreactor 2 through the water inlet valve 22, and hydroxylamine is added at the same time to control the hydroxylamine concentration in the container to 5 mg / L.

[0033] (3) Start the aeration pump 214 to continuously aerate the sludge for 1 hour through the aeration head 212, and control the dissolved oxygen concentration in the reactor to 6 mg / L. After the aeration stage is completed, the flocculent sludge is washed after it settles.

[0034] (4) Repeat steps (2) to (3) for 7 days. During the pretreatment period, 1 / 2 of the reaction volume of sludge is discharged every day, and the sludge age is controlled to 2 days.

[0035] (5) The anaerobic ammonium oxidation granular sludge was inoculated into the above-mentioned dual-zone bioreactor 2, and the granular sludge concentration was 8000 mg / L.

[0036] (6) Start the water inlet peristaltic pump 21 and pump the 45 mg / L low-ammonia nitrogen wastewater in the water inlet tank 1 into the dual-zone bioreactor 2 through the water inlet valve 22.

[0037] (7) After the water inlet is completed, the reflux peristaltic pump 23 is started, and the mixture at the top is refluxed to the lower granular sludge through the bottom water inlet 25 through the reflux valve 24 of the dual-zone bioreactor 2. At the same time, the aeration pump 214 and the aeration head 212 are started, and the upper dissolved oxygen concentration of the dual-zone bioreactor 2 is controlled to 0.01 mg / L~0.5 mg / L through the upper sensor 28 and the upper dissolved oxygen detection instrument 29.

[0038] (8) Aerobic stage (45 minutes): the aeration time is adjusted according to the effluent ammonia nitrogen concentration (3 mg / L).

[0039] (9) 5 minutes before the end of aeration, part of the floc sludge is discharged through the sludge discharge valve 26. The sludge age of the floc sludge is 2 days.

[0040] (10) After the floc sludge settles for 10 minutes, the treated water is connected to the water collecting tank 3 through the outlet valve 27 for drainage. The drainage volume accounts for 62.5% of the total volume of the reactor.

[0041] (11) Steps (6) to (10) are repeated, and the dual-zone bioreactor 2 is operated in a batch processing mode to achieve short-range nitrification / anaerobic ammonium oxidation high-rate denitrification based on NOB stable control.

[0042] The experimental results show that in this dual-zone bioreactor system, the inlet ammonia nitrogen concentration is 45 mg / L; the volumetric nitrogen removal rate is 1.4 gN / L / d to 1.6 gN / L / d; after pretreatment, the activity of NOB is less than 0.01 / gN / g-SS / d, achieving stable short-term nitrification / anaerobic ammonia oxidation; the effluent total nitrogen is 7.3 mg / L~8.4 mg / L; the ammonia nitrogen concentration is 2.3 mg / L~3.1 mg / L; the effluent nitrate nitrogen concentration is less than 4.5 mg / L; the results show that the device and method successfully achieved short-term nitrification / anaerobic ammonia oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas.

[0043] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for high-rate denitrification of low-ammonia nitrogen wastewater by short-cut nitrification / anaerobic ammonium oxidation in tropical areas, characterized in that: The method comprises the following steps: inputting low-ammonia nitrogen wastewater from an inlet tank (1) into a dual-zone bioreactor (2) through an inlet peristaltic pump (21); adding inoculated flocculent sludge to the dual-zone bioreactor (2); the pretreatment stage comprises adding hydroxylamine; starting an aeration pump (214) to continuously aerate the sludge through an aeration head (212) and controlling a relatively short sludge age; adding inoculated granular sludge to the dual-zone bioreactor (2); aerating the upper part of the dual-zone bioreactor (2) using an aeration pump (214) and an aeration head (212); starting a reflux peristaltic pump (23) to reflux the mixture at the top through a reflux valve (24) through a bottom water inlet (25) into the granular sludge at the lower part of the dual-zone bioreactor (2); discharging part of the flocculent sludge through a sludge discharge valve (26); and connecting the treated water to a water collecting tank (3) through an outlet valve (27) for drainage.

2. According to the method of claim 1, which is characterized by: The runtime adjustment operation is as follows: 1) First, the flocculent sludge is inoculated into the dual-zone bioreactor (2), and the sludge concentration is controlled at 3000mg / L~3500mg / L; 2) Entering the pretreatment stage, the water inlet peristaltic pump (21) is started to pump the low-ammonia nitrogen wastewater with a concentration of 35.0 mg / L to 55.0 mg / L in the water inlet tank (1) into the water inlet valve (22) of the dual-zone bioreactor (2), and hydroxylamine is added at the same time to control the hydroxylamine concentration in the dual-zone bioreactor (2) to be 5 mg / L; 3) Start the aeration pump (214) to continuously aerate the sludge for 1 hour through the aeration head (212), and control the dissolved oxygen concentration of the dual-zone bioreactor (2) to be 4 mg / L-6 mg / L; after the aeration stage is completed, wash the sludge after the flocculent sludge is settled; 4) Repeat steps 2) to 3) for a pretreatment period of 7 days, during which 1 / 2 of the reaction volume of sludge is discharged every day, and the sludge age is controlled to be 2 days; 5) Inoculate the anaerobic ammonium oxidation granular sludge into the above-mentioned dual-zone bioreactor (2), and control the granular sludge concentration to be 5000mg / L~9000mg / L; 6) Start the water inlet peristaltic pump (21) to pump the low-ammonia nitrogen wastewater with a concentration of 35.0 mg / L to 55.0 mg / L in the water inlet tank (1) into the water inlet valve (22) of the dual-zone bioreactor (2); 7) After the water inflow is completed, the reflux peristaltic pump (23) is started to return the mixture at the top to the lower granular sludge through the reflux valve (24) of the dual-zone bioreactor (2) through the bottom water inlet (25), and the aeration pump (214) and the aeration head (212) are started at the same time, and the dissolved oxygen concentration in the upper part of the dual-zone bioreactor (2) is controlled to be 0.01 mg / L~0.5 mg / L through the upper sensor (28) and the upper dissolved oxygen detection instrument (29); 8) The aerobic stage is 60 minutes to 25 minutes. The aeration time is adjusted according to the effluent ammonia nitrogen concentration, which is 2mg / L~3mg / L. 9) 5 minutes before the end of aeration, part of the flocculent sludge is discharged through the sludge discharge valve (26) to control the sludge age of the flocculent sludge to be 1 day to 3 days; 10) After the flocculent sludge settles for 10 minutes, the treated water is connected to the water collecting tank (3) through the outlet valve (27) for drainage, and the drainage volume accounts for 60%-65% of the total volume of the reactor; 11) Repeat steps 6) to 10) and operate the dual-zone bioreactor (2) in a batch processing mode to achieve short-range nitrification / anaerobic ammonium oxidation high-rate denitrification based on stable NOB control.

3. A device for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation, characterized in that: It comprises a water inlet tank (1), a dual-zone bioreactor (2) and a water collecting tank (3) which are connected in sequence, wherein the water inlet tank (1) is connected to a water inlet valve (22) of the dual-zone bioreactor (2), and the dual-zone bioreactor (2) is connected to the water collecting tank (3) via a water outlet valve (27).

4. The device for short-range nitrification / anaerobic ammonium oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to claim 3, characterized in that: The water inlet tank (1) is provided with a first drain valve (11).

5. The device for short-range nitrification / anaerobic ammonium oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to claim 3, characterized in that: The dual-zone bioreactor (2) is equipped with a water inlet peristaltic pump (21), a water inlet valve (22), a reflux peristaltic pump (23), a reflux valve (24), a bottom water inlet (25), a mud discharge valve (26), a water outlet valve (27), an upper sensor (28), an upper dissolved oxygen detection instrument (29), a lower sensor (210), a lower dissolved oxygen detection instrument (211), an aeration head (212), a gas flow meter (213), and an aeration pump (214).

6. The device for short-range nitrification / anaerobic ammonium oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to claim 3, characterized in that: The water collecting tank (3) is provided with a second drain valve (31).

7. The device for short-range nitrification / anaerobic ammonium oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to claim 5, characterized in that: The reflux valve (24) is connected to the bottom water inlet (25), and a reflux peristaltic pump (23) is arranged in the middle.

8. The device for short-range nitrification / anaerobic ammonium oxidation high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas according to claim 5, characterized in that: The upper sensor (28) is connected to the upper dissolved oxygen detection instrument (29), and the lower sensor (210) is connected to the lower dissolved oxygen detection instrument (211), so as to display the dissolved oxygen concentration in real time.

9. The system according to claim 5, characterized in that The aeration pump (214) is connected to the gas flow meter (213) and the aeration head (212) in sequence.

10. A device for high-rate denitrification of low-ammonia nitrogen wastewater in tropical areas by short-range nitrification / anaerobic ammonia oxidation, characterized in that: The invention comprises a water inlet tank (1), a dual-zone bioreactor (2) and a water collecting tank (3), wherein the water inlet tank (1) is provided with a first vent valve (11), and the dual-zone bioreactor (2) is provided with a water inlet peristaltic pump (21), a water inlet valve (22), a reflux peristaltic pump (23), a reflux valve (24), a bottom water inlet (25), a mud discharge valve (26), a water outlet valve (27), an upper sensor (28), an upper dissolved oxygen detection instrument (29), a lower sensor (210), and a lower dissolved oxygen detection instrument (211). , an aeration head (212), a gas flow meter (213), and an aeration pump (214); the water collecting tank (3) is provided with a second vent valve (31); the reflux valve (24) is connected to the bottom water inlet (25), and a reflux peristaltic pump (23) is arranged in the middle; the upper sensor (28) is connected to the upper dissolved oxygen detection instrument (29), and the lower sensor (210) is connected to the lower dissolved oxygen detection instrument (211); the aeration pump (214) is connected to the gas flow meter (213) and the aeration head (212) in sequence.

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