Integrated dephosphorization and denitrification device and method

Abstract

The invention provides an integrated dephosphorization and denitrification device and method.The integrated dephosphorization and denitrification device comprises a denitrification module, an aeration dephosphorization module and an anaerobic ammonia oxidation module, and the aeration dephosphorization module and the anaerobic ammonia oxidation module are located above the denitrification module; the aeration dephosphorization module is positioned on the outer side of the anaerobic ammonia oxidation module; the denitrification module is provided with a water inlet pipe, the anaerobic ammonia oxidation module is provided with a water outlet pipe, the denitrification module is communicated with the aeration dephosphorization module through a denitrification water outlet pipe, and the aeration dephosphorization module is communicated with the anaerobic ammonia oxidation module through an aeration dephosphorization water outlet pipe. The anaerobic ammonia oxidation module is communicated with the denitrification module through a return water inlet pipe; and the aeration dephosphorization module is provided with a magnesium hydroxide dosing pipe for adding magnesium hydroxide. By adopting the technical scheme, additional carbon sources are not needed, phosphorus and nitrogen removal is integrally and synchronously realized, the process is simplified, and the occupied area and the investment cost are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to an integrated phosphorus and nitrogen removal device and method. Background Art

[0002] Currently, the A / O method is the mainstream process for biological denitrification of wastewater. This process achieves denitrification through the synergistic action of an anoxic (A) and an aerobic (O) section. The anoxic section utilizes denitrifying bacteria to reduce nitrate nitrogen to nitrogen gas, while the aerobic section removes organic matter and converts ammonia nitrogen to nitrate nitrogen. During operation, the mixed liquor from the aerobic section is returned to the anoxic section to complete denitrification. This process prioritizes biodegradable organic matter in the raw water as a carbon source for denitrification. If the influent C / N ratio is insufficient, additional carbon source must be added, increasing treatment costs.

[0003] With the development of biotechnology, anaerobic ammonium oxidation (ANAMMOX) technology has been gradually applied to the field of biological denitrification of wastewater. This process uses ANAMMOX bacteria to directly convert ammonia nitrogen and nitrite nitrogen into nitrogen gas. The reaction equation is as follows: 1NH4 + +1.32NO2 - +0.066HCO3 - +0.13H + →1.02N2+0.26NO3 - +0.066CH2O 0.5 N 0.15 +2.03H2O

[0004] Compared to the A / O method, it offers advantages such as reduced CO2 emissions, no need for an external carbon source, a smaller footprint, and low aeration requirements. Engineering practices categorize it into a single-stage process (nitritation and anaerobic ammonium oxidation in the same reactor) and a two-stage process (separate reactors). However, this process places stringent control requirements on influent organic matter, phosphate levels, and other indicators. Furthermore, residual nitrate nitrogen after treatment imposes an upper limit on total nitrogen removal, making it difficult to meet high total nitrogen emission requirements.

[0005] However, existing ANAMMOX combined systems have significant drawbacks. When treating high-COD wastewater, high-load aeration and ANAMMOX combined systems consume high aeration energy and operating costs. Furthermore, residual nitrate-nitrogen in the ANAMMOX effluent requires subsequent denitrification, and denitrification further depletes the carbon source. In combined denitrification-nitrification reactors and ANAMMOX reactors, denitrification relies on microbial degradation of the carbon source. Insufficient carbon sources result in incomplete reactions. Supplementing the carbon source not only increases costs but also leads to residual COD in the effluent, triggering excessive growth of heterotrophic bacteria within the ANAMMOX reactor. Consequently, heterotrophic bacteria outnumber ANAMMOX bacteria in the ANAMMOX reactor, leading to bioinhibition. Furthermore, neither type of combined system can address the problem of phosphate precipitation caused by high-phosphate influent. Precipitates such as magnesium ammonium phosphate and calcium phosphate form nuclei. These inorganic nuclei allow newly generated ANAMMOX microorganisms to attach to these nuclei, causing the ANAMMOX sludge to become sandy and inactive. This necessitates additional phosphorus removal processes, complicating the process flow and increasing costs. Summary of the Invention

[0006] In response to the above technical problems, the present invention discloses an integrated phosphorus removal and nitrogen removal device and method, which solves the problems of COD and phosphate in the incoming water for ammonia nitrogen wastewater with a low C / N ratio, gives full play to the advantages of low energy consumption denitrification of anaerobic ammonia oxidation, solves the problem of residual nitrate nitrogen in the anaerobic ammonia oxidation effluent requiring further deep denitrification, does not require an additional carbon source, greatly reduces the operating costs of biological denitrification, and achieves one-stop efficient phosphorus removal and nitrogen removal.

[0007] To this end, the technical solution adopted in the present invention is:

[0008] An integrated phosphorus removal and nitrogen removal device comprises a denitrification module, an aeration phosphorus removal module and an anaerobic ammonium oxidation module, wherein the aeration phosphorus removal module and the anaerobic ammonium oxidation module are located above the denitrification module, and the aeration phosphorus removal module is located outside the anaerobic ammonium oxidation module; the denitrification module is provided with a water inlet pipe, and the anaerobic ammonium oxidation module is provided with a water outlet pipe, the denitrification module is connected to the aeration phosphorus removal module via the denitrification outlet pipe, the aeration phosphorus removal module is connected to the anaerobic ammonium oxidation module via the aeration phosphorus removal outlet pipe, and the anaerobic ammonium oxidation module is connected to the denitrification module via a return water inlet pipe; the aeration phosphorus removal module is provided with a magnesium hydroxide dosing pipe for adding magnesium hydroxide for phosphorus removal.

[0009] Among them, the denitrification module uses the biodegradable organic matter in the wastewater as a carbon source to reduce nitrate nitrogen to nitrogen gas, while removing most of the organic matter in the incoming water. The aeration phosphorus removal module plays the role of high-load aeration and phosphorus removal; magnesium hydroxide is added to the aeration phosphorus removal module through the magnesium hydroxide dosing pipe, and the aeration of the aeration phosphorus removal is used to provide stirring energy. Under high stirring intensity, the phosphate and ammonium ions in the water react with magnesium to form magnesium ammonium phosphate (struvite) by utilizing the struvite precipitation principle, solving the problem of phosphate ions in the incoming water and reducing the ammonia nitrogen load of the subsequent anaerobic ammonium oxidation module. The generated struvite precipitate can be sold as a slow-release fertilizer after extraction and treatment, which has economic value and can achieve resource recycling. The anaerobic ammonium oxidation module converts ammonia nitrogen in the wastewater into nitrogen gas.

[0010] Using this technical solution, high-ammonia wastewater carrying organic matter and phosphates flows sequentially through the denitrification module, aeration phosphorus removal module, and anaerobic ammonium oxidation module, ultimately achieving low-energy, one-stop, efficient phosphorus and nitrogen removal. The integrated design shortens the process flow, significantly reduces floor space, and reduces investment.

[0011] As a further improvement of the present invention, the denitrification module includes a denitrification cylinder, which is provided with a denitrification water distributor, a diversion cylinder, a denitrification three-phase separator, and a denitrification water collection pipe from bottom to top; the bottom two sides of the denitrification cylinder are respectively connected to a water inlet pipe and a circulating water pipe, and the circulating water pipe is connected to the water inlet pipe through a circulating pump; the water inlet pipe is connected to the denitrification water distributor; the top of the denitrification cylinder is connected to a denitrification exhaust pipe and a denitrification outlet pipe.

[0012] Using this technical solution, high-ammonia wastewater containing a certain amount of organic matter and phosphate enters the denitrification module through the water inlet pipe, is ejected vertically upward at high speed through the denitrification water distributor, and forms an upward flow pattern within the diversion tube. The high-speed water flow forms a negative pressure zone at the bottom of the diversion tube, sucking in water outside the diversion tube and flowing upward within the diversion tube together with the water ejected by the denitrification water distributor. A circulating pump draws water from the diversion tube, pressurizes it, and then merges it into the water inlet pipe through the circulating water pipe. At the same time, the return water from the anaerobic ammonium oxidation module is also merged into the water inlet pipe. Within the denitrification tube, the nitrate nitrogen in the return water of the anaerobic ammonium oxidation module and the organic matter in the incoming water are denitrified by the action of the denitrification sludge. Under the action of the denitrification three-phase separator, the gas, liquid and solid in the denitrification cylinder are separated into three phases; the nitrogen produced by denitrification is discharged into the atmosphere through the denitrification exhaust pipe; the denitrification effluent is collected through the denitrification water collection pipe and then enters the aeration phosphorus removal module through the denitrification outlet pipe; the denitrification sludge flows back to the denitrification cylinder under the action of gravity to continue the reaction.

[0013] As a further improvement of the present invention, the middle and lower part of the denitrification cylinder is connected to a denitrification dosing pipe, which extends into the denitrification cylinder and is connected to the diversion cylinder; a denitrification online pH meter is provided in the middle of the denitrification cylinder; and a denitrification sludge discharge pipe is provided at the bottom of the denitrification cylinder. Considering that alkalinity is generated during the denitrification process, the denitrification online pH meter provided in the middle of the denitrification cylinder can monitor the pH of the mixed liquid in the denitrification cylinder in real time. When the pH is high, acid is added through the denitrification dosing pipe to adjust the pH to a range of 6.5 to 7.5. In addition, since denitrifying bacteria will proliferate during the denitrification process, in order to maintain the concentration of biological sludge in the denitrification zone, excess biological sludge can be discharged through the denitrification sludge discharge pipe.

[0014] As a further improvement of the present invention, the denitrification water distributor is located at the bottom of the draft tube, and the denitrification three-phase separator is located above the draft tube.

[0015] As a further improvement of the present invention, the denitrification water distributor is provided with a plurality of vertically upward nozzles, and the nozzles are located within the bottom of the guide tube.

[0016] As a further improvement of the present invention, the distance between the denitrification three-phase separator and the draft tube is 500-1000 mm. With this technical solution, the effluent from the draft tube can be turned out of this gap, with a portion of the effluent flowing downward to fill the space at the bottom where the wastewater is drawn into the draft tube, forming a flow pattern that flows up and down along the inside and outside of the draft tube. This allows the denitrifying biological sludge and wastewater in the denitrification tube to fully mix and react. At this time, the nitrate nitrogen in the return water is reduced to nitrogen gas by the denitrifying bacteria using the biodegradable organic matter in the wastewater as a carbon source, while simultaneously removing most of the organic matter in the incoming water.

[0017] As a further improvement of the present invention, the aeration phosphorus removal module is circumferentially arranged around the anaerobic ammonium oxidation module.

[0018] As a further improvement of the present invention, the aeration and phosphorus removal module includes an aeration and phosphorus removal cylinder, an aeration and phosphorus removal water pipe connected to the denitrification outlet pipe is provided at the bottom of the aeration and phosphorus removal cylinder, an aeration and phosphorus removal aerator is provided in the aeration and phosphorus removal cylinder, the aeration and phosphorus removal aerator is located above the aeration and phosphorus removal water pipe and is connected to the aeration and phosphorus removal air pipe; an aeration and phosphorus removal guide tube is provided above the aeration and phosphorus removal aerator, and an aeration and phosphorus removal three-phase separator is provided above the aeration and phosphorus removal guide tube; the magnesium hydroxide dosing pipe is introduced into the aeration and phosphorus removal guide tube; the water inlet end of the aeration and phosphorus removal outlet pipe is located at the top of the aeration and phosphorus removal three-phase separator.

[0019] With this technical solution, the effluent from the denitrification module enters the bottom of the aeration and phosphorus removal cylinder through the aeration and phosphorus removal water pipe, and the air enters the bottom of the aeration and phosphorus removal cylinder through the aeration and phosphorus removal air pipe and is evenly distributed into the water through the aeration and phosphorus removal aerator, providing dissolved oxygen for the activated sludge in the aeration and phosphorus removal cylinder, so that the residual organic matter in the incoming water is degraded under the action of heterotrophic bacteria. After aeration, the density of the medium inside the aeration and phosphorus removal guide tube is less than that outside, forming a high-speed circulation, providing higher stirring energy, and promoting the formation of magnesium ammonium phosphate (struvite). The water in the aeration and phosphorus removal cylinder flows upward together with the air and sludge into the aeration and phosphorus removal three-phase separator to achieve three-phase separation. Excess air escapes along the water surface, and the effluent from the aeration and phosphorus removal cylinder is discharged to the anaerobic ammonia oxidation module through the aeration and phosphorus removal outlet pipe; the sludge in the aeration and phosphorus removal cylinder falls to the bottom of the aeration and phosphorus removal three-phase separator under the action of gravity, and falls back into the aeration and phosphorus removal cylinder to continue participating in the reaction.

[0020] As a further improvement of the present invention, the aeration phosphorus removal module includes an aeration phosphorus removal sludge discharge pipe connected to the aeration phosphorus removal cylinder. With this technical solution, the microbial growth sludge produced by COD degradation and the generated struvite crystals form a mixed sludge, which can be discharged through the aeration phosphorus removal sludge discharge pipe.

[0021] As a further improvement to the present invention, the aeration and phosphorus removal module includes an online DO meter inserted below the liquid level within the aeration and phosphorus removal cylinder. This technical solution allows for real-time monitoring of the dissolved oxygen concentration within the aeration and phosphorus removal cylinder. By controlling the air volume in the aeration and phosphorus removal air pipe, the dissolved oxygen concentration within the aeration and phosphorus removal cylinder can be controlled to between 0.3 and 0.5 mg / L.

[0022] As a further improvement of the present invention, the aeration and phosphorus removal aerator is a coarse-pore aerator, which can avoid excessive dissolved oxygen while meeting the stirring capacity.

[0023] As a further improvement of the present invention, the anaerobic ammonium oxidation module adopts a one-stage anaerobic ammonium oxidation method. The module includes an anaerobic ammonium oxidation cylinder and a water collecting cylinder. An anaerobic ammonium oxidation water distribution pipe is provided at the bottom of the anaerobic ammonium oxidation cylinder, and the anaerobic ammonium oxidation water distribution pipe is connected to the aeration and phosphorus removal outlet pipe; an anaerobic ammonium oxidation aerator is provided above the anaerobic ammonium oxidation water distribution pipe, and the anaerobic ammonium oxidation aerator is connected to the anaerobic ammonium oxidation air pipe. An anaerobic ammonium oxidation aerator is provided in the middle and upper part of the anaerobic ammonium oxidation cylinder. A three-phase separator is provided. The top of the ANAMMOX three-phase separator is equipped with an ANAMMOX outlet pipe, which is connected to a water collection cylinder. The upper portion of the water collection cylinder is connected to the outlet pipe. The bottom of the water collection cylinder is connected to the return water inlet pipe via an outlet return pipe. A heat exchange pipe is provided within the ANAMMOX cylinder, with both ends connected to the hot water inlet pipe and the hot water return pipe, respectively. An ANAMMOX pH dosing pipe and a trace element injection pipe are provided at the top of the ANAMMOX cylinder. Trace elements required by the ANAMMOX microorganisms are added to the ANAMMOX cylinder through the trace element injection pipe.

[0024] With this technical solution, effluent from the aerated phosphorus removal outlet pipe enters the ANAMMOX cylinder through the ANAMMOX distribution pipe. Air enters the bottom of the ANAMMOX cylinder through the ANAMMOX air pipe and is evenly distributed into the water by the ANAMMOX aerator. This provides oxygen for the ANAMMOX granular sludge in the ANAMMOX cylinder to nitrite-formate ammonia nitrogen and also serves to agitate and mix the wastewater and granular sludge. Under the action of ANAMMOX bacteria, ammonia nitrogen in the wastewater is ultimately converted into nitrogen gas, while a portion of nitrate nitrogen is generated. Within the ANAMMOX cylinder, water, gas, and sludge flow upward and separate into three phases in the ANAMMOX three-phase separator. Gas escapes from the water surface, while the ANAMMOX granular sludge flows back into the ANAMMOX cylinder to continue the reaction. The effluent is discharged into a water collection tank. The water collection tank provides a buffer for the effluent and further removes gas from the water, preventing cavitation in the subsequent booster pump. The bottom of the water collection cylinder is connected to the water return pipe, and the top overflows, allowing the final effluent to be discharged outside the system through the outlet pipe. Considering that anaerobic ammonium oxidizing bacteria are most active at temperatures between 30 and 40°C and less active below 35°C, when the water temperature is low, the water temperature in the anaerobic ammonium oxidizing cylinder can be controlled by heating. Hot water is connected from the hot water inlet pipe to the heat exchange pipe. After heat exchange, the water temperature is reduced and then returned to the external heating system through the hot water return pipe.

[0025] As a further improvement of the present invention, the anaerobic ammonium oxidation module includes an anaerobic ammonium oxidation online thermometer, an anaerobic ammonium oxidation online pH meter, and an anaerobic ammonium oxidation online DO meter. The anaerobic ammonium oxidation online thermometer, the anaerobic ammonium oxidation online pH meter, and the anaerobic ammonium oxidation online DO meter are inserted below the liquid level in the anaerobic ammonium oxidation cylinder. With this technical solution, the water temperature in the anaerobic ammonium oxidation cylinder can be monitored in real time by the anaerobic ammonium oxidation online thermometer, and the external heating system can be controlled to maintain the water temperature at 33 to 38°C. The one-stage anaerobic ammonium oxidation method adopted by the anaerobic ammonium oxidation module includes a nitrite reaction, which consumes alkalinity. The anaerobic ammonium oxidation online pH meter can monitor the pH of the mixed liquid in the anaerobic ammonium oxidation cylinder in real time, and the pH can be controlled at 7.5 to 8.0 by controlling the addition of alkali solution to the anaerobic ammonium oxidation dosing pipe. According to the feedback from the anaerobic ammonium oxidation online DO meter, the air supply in the anaerobic ammonium oxidation air pipe can be adjusted to control the dissolved oxygen below 0.3 mg / L.

[0026] As a further improvement of the present invention, a booster pump is provided between the water outlet return pipe and the return water inlet pipe.

[0027] As a further improvement of the present invention, the bottom of the water collecting cylinder is in an inverted cone shape.

[0028] As a further improvement of the present invention, the anaerobic ammonium oxidation aerator is a microporous aerator.

[0029] As a further improvement of the present invention, the diameter of the denitrification cylinder is equal to that of the anaerobic ammonium oxidation cylinder and is smaller than the outer diameter of the aeration phosphorus removal cylinder.

[0030] As a further improvement of the present invention, the bottom of the aeration and phosphorus removal cylinder is in an inverted cone shape.

[0031] The present invention also discloses an integrated dephosphorization and denitrification method, comprising: transporting wastewater through a water inlet pipe to the integrated dephosphorization and denitrification device for treatment, and adding magnesium hydroxide to the magnesium hydroxide dosing pipe.

[0032] As a further improvement of the present invention, the integrated phosphorus and nitrogen removal method includes: monitoring the pH of the liquid in the denitrification cylinder in real time by the denitrification online pH meter, adjusting the amount of acid added in the denitrification dosing pipe, and controlling the pH of the liquid in the denitrification cylinder to be 6.5-7.5;

[0033] According to the feedback result of the aeration dephosphorization online DO instrument, the air supply in the aeration dephosphorization air pipe is adjusted to control the dissolved oxygen on the liquid surface in the aeration dephosphorization cylinder to be 0.3-0.5 mg / L;

[0034] According to the feedback result of the anaerobic ammonium oxidation online thermometer, the hot water volume or water temperature of the hot water inlet pipe is adjusted to control the water temperature of the liquid in the anaerobic ammonium oxidation cylinder to 33-38°C;

[0035] According to the feedback result of the anaerobic ammonium oxidation online pH meter, the dosage in the anaerobic ammonium oxidation pH dosing tube is adjusted to control the pH of the liquid in the anaerobic ammonium oxidation cylinder to 7.5-8.0;

[0036] The air supply in the anaerobic ammonium oxidation air pipe is adjusted according to the feedback result of the anaerobic ammonium oxidation online DO instrument, and the dissolved oxygen in the liquid in the anaerobic ammonium oxidation cylinder is controlled to be below 0.3 mg / L.

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

[0038] First, efficient utilization of carbon sources. The technical solution of the present invention fully utilizes the organic matter in the wastewater to reduce the nitrate nitrogen produced by the anaerobic ammonium oxidation reaction, without the need to add additional carbon sources, thus reducing operating costs.

[0039] Second, energy consumption is significantly reduced. With the technical solution of this invention, the high-load aeration in the aeration phosphorus removal module serves only as a safeguard for organic matter control. Because most biodegradable organic matter has already been removed during the preceding denitrification process, the power consumption of this aeration step is significantly reduced compared to direct treatment of incoming water, reducing overall system power consumption by 20%.

[0040] Third, simultaneous phosphorus removal and resource recovery. The technical solution of the present invention adds magnesium hydroxide to the aeration phosphorus removal module, utilizes aeration stirring energy, and based on the struvite precipitation principle, causes phosphate, ammonium and magnesium ions to react to form magnesium ammonium phosphate precipitate. This process not only effectively removes phosphate in wastewater, but also reduces the influent ammonia nitrogen load of the subsequent anaerobic ammonium oxidation module. The generated struvite precipitate can be sold as a slow-release fertilizer after extraction and treatment, realizing resource recycling. The phosphorus removal operating cost is only 0.3 yuan per cubic meter of wastewater.

[0041] Fourth, deep denitrification and process simplification. The technical solution of this invention achieves low total nitrogen content in the effluent, eliminating the need for additional deep denitrification treatment and meeting high total nitrogen emission standards. The integrated design shortens the process flow, significantly reducing floor space and investment costs. Taking wastewater with an influent ammonia nitrogen content of 1000 mg / L and phosphate ion content of 200 mg / L as an example, the total nitrogen removal rate increased from 81.6% to 96%, reducing operating costs by 1.10 yuan per cubic meter of wastewater, achieving one-stop, low-energy, and high-efficiency deep phosphorus and nitrogen removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a working principle diagram of the integrated phosphorus removal and nitrogen removal device according to an embodiment of the present invention.

[0043] Figure 2 It is a structural schematic diagram of an integrated phosphorus removal and nitrogen removal device according to an embodiment of the present invention.

[0044] Reference numerals include:

[0045] 1-denitrification module, 2-aeration phosphorus removal module, 3-anaerobic ammonium oxidation module;

[0046] 100 - denitrification cylinder, 101 - water inlet pipe, 102 - denitrification water distributor, 103 - diversion cylinder, 104 - circulating water inlet pipe, 105 - circulating pump, 106 - circulating water outlet pipe, 107 - denitrification three-phase separator, 108 - denitrification water collection pipe, 109 - denitrification water outlet pipe, 110 - denitrification exhaust pipe, 111 - denitrification sludge discharge pipe, 112 - denitrification dosing pipe, 113 - denitrification online pH meter;

[0047] 200 - aeration and phosphorus removal cylinder, 201 - aeration and phosphorus removal water distribution pipe, 202 - aeration and phosphorus removal air pipe, 203 - aeration and phosphorus removal aerator, 204 - aeration and phosphorus removal flow guide tube, 205 - aeration and phosphorus removal three-phase separator, 206 - aeration and phosphorus removal water outlet pipe, 207 - magnesium hydroxide dosing pipe, 208 - aeration and phosphorus removal sludge discharge pipe, 209 - aeration and phosphorus removal online DO meter;

[0048] 300-ANAMMOX cylinder, 301-ANAMMOX water distribution pipe, 302-ANAMMOX air pipe, 303-ANAMMOX aerator, 304-ANAMMOX three-phase separator, 305-ANAMMOX outlet pipe, 306-water collecting cylinder, 307-outlet pipe, 308-outlet return pipe, 309-hot water inlet pipe, 310-heat exchange pipe, 311-hot water return pipe, 312-ANAMMOX pH dosing pipe, 313-trace element dosing pipe, 314-ANAMMOX online thermometer, 315-ANAMMOX online pH meter, 316-ANAMMOX online DO meter, 317-boosting pump, 318-return water inlet pipe. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention are described in further detail below.

[0050] like Figure 1 and Figure 2As shown, the integrated phosphorus removal and nitrogen removal device includes a denitrification module 1, an aeration phosphorus removal module 2, and an anaerobic ammonium oxidation module 3. The denitrification module 1, the aeration phosphorus removal module 2, and the anaerobic ammonium oxidation module 3 constitute a reactor system. Among them, the denitrification module 1 is located below the reactor system, the aeration phosphorus removal module 2 and the anaerobic ammonium oxidation module 3 are located above the reactor system, and the anaerobic ammonium oxidation module 3 is directly above the denitrification module 1, and the aeration phosphorus removal module 2 forms a circle around the anaerobic ammonium oxidation module 3. The denitrification module 1 is connected to the aeration phosphorus removal module 2 through the denitrification outlet pipe 109, the aeration phosphorus removal module 2 is connected to the anaerobic ammonium oxidation module 3 through the aeration phosphorus removal outlet pipe 206, and the anaerobic ammonium oxidation module 3 is connected to the denitrification module 1 through the return water inlet pipe 318. The aeration phosphorus removal module 2 is provided with a magnesium hydroxide dosing pipe 207 for adding magnesium hydroxide.

[0051] Specifically, the denitrification module 1 includes a denitrification cylinder 100, a water inlet pipe 101, a circulating water inlet pipe 104, a circulating pump 105, a circulating water outlet pipe 106, a denitrification water outlet pipe 109, a denitrification exhaust pipe 110, a denitrification sludge discharge pipe 111, a denitrification dosing pipe 112, and a denitrification online pH meter 113. The denitrification cylinder 100 is provided with a denitrification water distributor 102, a flow guide tube 103, a denitrification three-phase separator 107, and a denitrification water collection pipe 108 from bottom to top. The water inlet pipe 101 is connected to the bottom of the denitrification cylinder 100. The circulating pump 105 is connected to the bottom of the denitrification cylinder 100 via the circulating water inlet pipe 104 and the circulating water outlet pipe 106. The denitrification exhaust pipe 110 is connected to the top of the denitrification cylinder 100; the denitrification sludge discharge pipe 111 is connected to the bottom of the denitrification cylinder 100; the denitrification dosing pipe 112 is located in the middle and lower part of the denitrification cylinder 100 and is connected to the diversion cylinder 103; the denitrification online pH meter 113 is connected to the middle part of the denitrification cylinder 100 and can monitor the pH of the liquid in the denitrification cylinder 100 in real time; the denitrification outlet pipe 109 is connected to the top of the denitrification cylinder 100; the water inlet end of the denitrification water distributor 102 is connected to the water inlet pipe 101, and its water outlet end is a vertically upward nozzle and is located inside the bottom of the diversion cylinder 103; the denitrification three-phase separator 107 is located at the upper part of the diversion cylinder 103, with a distance of 500 to 1000 mm from the diversion cylinder.

[0052] The aeration and phosphorus removal module 2 includes an aeration and phosphorus removal cylinder 200, an aeration and phosphorus removal water distribution pipe 201, an aeration and phosphorus removal air pipe 202, an aeration and phosphorus removal aerator 203, an aeration and phosphorus removal flow guide cylinder 204, an aeration and phosphorus removal three-phase separator 205, an aeration and phosphorus removal outlet pipe 206, a magnesium hydroxide dosing pipe 207, an aeration and phosphorus removal sludge discharge pipe 208, and an aeration and phosphorus removal online DO meter 209. The aeration and phosphorus removal water distribution pipe 201 is located at the bottom of the aeration and phosphorus removal cylinder 200 and is connected to the denitrification outlet pipe 111; the aeration and phosphorus removal aerator 203 is located above the aeration and phosphorus removal water distribution pipe 201 and is connected to the aeration and phosphorus removal air pipe 202; the aeration and phosphorus removal aerator 203 is a coarse-pore aerator. The aeration and phosphorus removal guide tube 204 is located above the aeration and phosphorus removal aerator 203; the aeration and phosphorus removal three-phase separator 205 is located at the upper part of the aeration and phosphorus removal cylinder 200, and is located above the aeration and phosphorus removal guide tube 204. The water inlet end of the aeration and phosphorus removal outlet pipe 206 is located at the top of the aeration and phosphorus removal three-phase separator 205, and its water outlet end is connected to the anaerobic ammonia oxidation module 3. The magnesium hydroxide dosing pipe 207 is connected to the aeration and phosphorus removal guide tube 204; the aeration and phosphorus removal sludge discharge pipe 208 is connected to the bottom of the aeration and phosphorus removal cylinder 200. The aeration and phosphorus removal online DO meter 209 is inserted below the liquid level in the aeration and phosphorus removal cylinder 200, and can be interlocked to adjust the air supply in the aeration and phosphorus removal air pipe 202 to further control the dissolved oxygen at 0.3-0.5 mg / L.

[0053] The anaerobic ammonium oxidation module 3 includes an anaerobic ammonium oxidation cylinder 300, an anaerobic ammonium oxidation water distribution pipe 301, an anaerobic ammonium oxidation air pipe 302, an anaerobic ammonium oxidation aerator 303, an anaerobic ammonium oxidation three-phase separator 304, an anaerobic ammonium oxidation outlet pipe 305, a water collecting cylinder 306, an outlet pipe 307, an outlet return pipe 308, a hot water inlet pipe 309, a heat exchange pipe 310, a hot water return pipe 311, an anaerobic ammonium oxidation pH dosing pipe 312, a trace element dosing pipe 313, an anaerobic ammonium oxidation online thermometer 314, an anaerobic ammonium oxidation online pH meter 315, an anaerobic ammonium oxidation online DO meter 316, a booster pump 317, and a return water inlet pipe 318. The anaerobic ammonium oxidation water distribution pipe 301 is located at the bottom of the anaerobic ammonium oxidation cylinder 300 and is connected to the aeration and phosphorus removal outlet pipe 206; the anaerobic ammonium oxidation aerator 303 is located above the anaerobic ammonium oxidation water distribution pipe 301 and is connected to the anaerobic ammonium oxidation air pipe 302. The anaerobic ammonium oxidation aerator 303 is a microporous aerator. The anaerobic ammonium oxidation three-phase separator 304 is located in the center of the upper part of the anaerobic ammonium oxidation cylinder 300. The water inlet end of the anaerobic ammonium oxidation outlet pipe 305 is connected to the top of the anaerobic ammonium oxidation three-phase separator 304, and its water outlet end is connected to the water collection cylinder 306. The outlet pipe 307 is connected to the upper part of the water collection cylinder 306; the bottom of the water collection cylinder is inverted cone shape; the outlet return pipe 308 is connected to the bottom of the water collection cylinder 306. The heat exchange tube 310 is located in the middle of the ANAMMOX cylinder 300, and its two ends are respectively connected to the hot water inlet pipe 309 and the hot water return pipe 311. The ANAMMOX pH dosing pipe 312 and the trace element dosing pipe 313 are respectively connected to the upper part of the ANAMMOX cylinder 300; the ANAMMOX online thermometer 314, the ANAMMOX online pH meter 315, and the ANAMMOX online DO meter 316 are all inserted below the liquid level in the ANAMMOX cylinder 300. The ANAMMOX online thermometer 314 can be interlocked to adjust the amount of hot water or water temperature of the hot water inlet pipe 309, thereby controlling the water temperature in the ANAMMOX cylinder 300. The ANAMMOX online pH meter 315 can also be interlocked to adjust the amount of dosing in the ANAMMOX pH dosing pipe 312 so that the pH range is adjusted to 7.5 to 8.0. The anaerobic ammonium oxidation online DO meter 316 can be interlocked to adjust the air supply in the anaerobic ammonium oxidation air pipe 302 to control the dissolved oxygen below 0.3 mg / L. The water inlet side of the booster pump 317 is connected to the water collection cylinder 306 through the outlet return pipe 308, and its outlet side is connected to the denitrification module through the return water inlet pipe 318.

[0054] The diameter of the denitrification cylinder 100 is equal to that of the anaerobic ammonium oxidation cylinder 200 and is smaller than the outer diameter of the aeration and phosphorus removal cylinder 300. The bottom of the aeration and phosphorus removal cylinder 300 is in an inverted cone shape.

[0055] This embodiment discloses an integrated phosphorus removal and nitrogen removal method, which uses the above-mentioned integrated phosphorus removal and nitrogen removal device to treat high-ammonia wastewater containing organic matter and phosphate. The working process is as follows:

[0056] High-ammonia wastewater, carrying a certain amount of organic matter and phosphate, enters the denitrification cylinder 100 of the denitrification module 1 through the water inlet pipe 101. It is then ejected vertically upward at high speed through the denitrification water distributor 102, forming an upward flow pattern within the diversion tube 103. The high-speed water flow forms a negative pressure zone at the bottom of the diversion tube 103, sucking in water from outside the diversion tube 103. Together with the water ejected from the denitrification water distributor 102, it flows upward within the diversion tube 103. The circulation pump 105 draws water from outside the diversion tube 103 through the circulation water inlet pipe 104, pressurizing it and then merging it into the water inlet pipe 101 through the circulation water outlet pipe 106. At the same time, the return water from the anaerobic ammonium oxidation module 3 is pressurized through the outlet return pipe 308 and the booster pump 317, and then flows through the return water inlet pipe 318 and into the water inlet pipe 101.

[0057] A gap of 500 to 1000 mm is provided between the upper part of the guide tube 103 and the denitrification three-phase separator 107. The effluent from the guide tube 103 can be turned over from this gap. A portion of the effluent flows downward to fill the space at the bottom where the wastewater is sucked into the guide tube 103 and flows away, forming a flow pattern that flows up and down along the inside and outside of the guide tube 103, so that the denitrifying biological mud and wastewater in the denitrification cylinder 100 are fully mixed and reacted. At this time, the nitrate nitrogen in the return water is reduced to nitrogen gas by the action of denitrifying bacteria by utilizing the easily biodegradable organic matter in the wastewater as a carbon source, while removing most of the organic matter in the incoming water. Under the action of the denitrification three-phase separator 107, the gas, liquid and solid in the denitrification cylinder 100 are separated into three phases: the nitrogen generated by denitrification is discharged into the atmosphere through the denitrification exhaust pipe 110; the denitrification effluent is collected through the denitrification water collection pipe 108 and then enters the aeration phosphorus removal module 2 through the denitrification outlet pipe 109; the denitrification sludge is returned to the denitrification cylinder 100 under the action of gravity to continue the reaction; in addition, since the denitrifying bacteria will increase during the denitrification process, the denitrifying bacteria will increase. In order to maintain the biological sludge concentration in the denitrification zone, the excess biological sludge is discharged through the denitrification sludge discharge pipe 111 at the bottom of the denitrification cylinder 100. Considering that alkalinity is generated during the denitrification process, a denitrification online pH meter 113 is set in the middle of the denitrification cylinder 100 to monitor the pH of the mixed liquid in the denitrification cylinder 100 in real time. When the pH is high, acid is added through the denitrification dosing pipe 112 to adjust the pH range to 6.5-7.5.

[0058] The effluent from the denitrification zone outlet pipe 109 enters the bottom of the aeration and phosphorus removal cylinder 200 through the aeration and phosphorus removal water pipe 201, while the air enters the bottom of the aeration and phosphorus removal cylinder 200 through the aeration and phosphorus removal air pipe 202 and is evenly distributed into the water through the aeration and phosphorus removal aerator 203, providing dissolved oxygen for the activated sludge in the aeration and phosphorus removal cylinder 200, so that the residual organic matter in the incoming water is degraded by the action of heterotrophic bacteria, so that the effluent meets the inlet COD requirements that can be met by the anaerobic ammonia oxidation reaction. The aeration and phosphorus removal aerator 203 is a coarse-pore aerator, which can avoid excessive dissolved oxygen while meeting the stirring energy requirements; the aeration and phosphorus removal guide tube 204 is located above the aeration and phosphorus removal aerator 203. After aeration, the medium density in the guide tube is lower than that outside, forming a high-speed circulation, providing higher stirring energy, and promoting the formation of magnesium ammonium phosphate (struvite). The water, air, and sludge in the aeration dephosphorization cylinder 200 flow upward into the aeration dephosphorization three-phase separator 205 for three-phase separation. Excess air escapes along the water surface, and the effluent from the aeration dephosphorization cylinder 200 is discharged to the anaerobic ammonium oxidation module 3 through the aeration dephosphorization outlet pipe 206. The sludge in the aeration dephosphorization cylinder 200 falls to the bottom of the aeration dephosphorization three-phase separator 204 under the action of gravity and falls back into the aeration dephosphorization cylinder 200 to continue participating in the reaction. Considering that the COD degradation process causes microorganisms to proliferate, mixed with struvite crystals to form sludge, which is ultimately discharged through the aeration dephosphorization sludge discharge pipe 208. Dissolved oxygen is a key control parameter in the aeration dephosphorization module. The dissolved oxygen concentration in the aeration dephosphorization cylinder 200 is monitored in real time by the aeration dephosphorization online DO meter 207, and the air volume in the aeration dephosphorization air pipe 202 is controlled in conjunction with the dissolved oxygen concentration in the aeration dephosphorization cylinder 200 to maintain a control range of 0.3 to 0.5 mg / L.

[0059] The effluent from the aerated phosphorus removal outlet pipe 206 enters the ANAMMOX cylinder 300 through the ANAMMOX water distribution pipe 301, while air enters the bottom of the ANAMMOX cylinder 300 through the ANAMMOX air pipe 302 and is evenly distributed into the water through the ANAMMOX aerator 303. This provides the oxygen required for the ANAMMOX granular sludge in the ANAMMOX cylinder 300 to undergo nitrite formation and simultaneously serves to agitate and mix the wastewater and granular sludge. Under the action of ANAMMOX bacteria, the ammonia nitrogen in the wastewater is ultimately converted into nitrogen gas, while a portion of nitrate nitrogen is generated. Within the ANAMMOX cylinder 300, water, gas, and sludge flow upward and are separated into three phases by the ANAMMOX three-phase separator 304. Gas escapes from the water surface, while the ANAMMOX granular sludge flows back into the ANAMMOX cylinder to continue the reaction. The effluent is discharged into the water collection cylinder 306 through the ANAMMOX water pipe 305. The function of the water collecting cylinder 306 is to provide a certain buffer space for the outlet water and further remove the gas in the water to prevent cavitation of the subsequent booster pump 317. The bottom of the water collecting cylinder 306 is connected to the outlet water return pipe 308, and the top is overflowed so that the final outlet water is discharged to the outside of the system through the water pipe 307.

[0060] Considering that anaerobic ammonium oxidizing bacteria are more active at temperatures between 30 and 40°C and less active below 35°C, when the water temperature is low, it is necessary to control the water temperature in the anaerobic ammonium oxidizing cylinder 300 by heating. The water temperature in the anaerobic ammonium oxidizing cylinder 300 is monitored in real time by the anaerobic ammonium oxidizing online thermometer 314 and the external heating system is controlled in conjunction to maintain the water temperature at 33 to 38°C. During heating, hot water is connected from the hot water inlet pipe 309 to the heat exchange pipe 310. After heat exchange, the water temperature is reduced and then flows back to the external heating system through the hot water return pipe 311.

[0061] In addition, since the present technical solution adopts a one-stage anaerobic ammonium oxidation method, which includes a nitrite reaction, alkalinity is consumed. The pH of the mixed liquid in the anaerobic ammonium oxidation cylinder 300 is monitored in real time by the anaerobic ammonium oxidation online pH meter 315 and the addition of alkaline solution in the anaerobic ammonium oxidation dosing pipe 312 is controlled in conjunction with the control so that the pH is controlled at 7.5 to 8.0. The trace elements required by the anaerobic ammonium oxidation microorganisms are added to the anaerobic ammonium oxidation cylinder 300 through the trace element dosing pipe 313. For the one-stage anaerobic ammonium oxidation reaction, dissolved oxygen is an important control parameter. The dissolved oxygen in the mixed liquid in the anaerobic ammonium oxidation cylinder 300 is monitored in real time by the anaerobic ammonium oxidation online DO meter 316 and the air volume in the anaerobic ammonium oxidation air pipe 302 is controlled in conjunction with the control so that the dissolved oxygen is controlled below 0.3 mg / L.

[0062] In the present embodiment, the organic matter carried in the incoming water is used as a carbon source to denitrify the nitrate nitrogen in the anaerobic ammonium oxidation effluent, without the need for an additional carbon source; the unused organic matter in the effluent after denitrification and denitrification continues to be removed by the high-load aeration of the subsequent aeration and phosphorus removal module, so that the aeration power consumption required for this step is greatly reduced compared to directly carrying out high-load aeration on the incoming water. At the same time, by adding magnesium hydroxide in the aeration and phosphorus removal module, the struvite crystallization principle is utilized to remove phosphorus, so that the phosphate radical and ammonium radical in the water react with magnesium to form magnesium ammonium phosphate (struvite), which solves the problem of incoming water phosphate radical, and reduces the influent ammonia nitrogen load for the subsequent anaerobic ammonium oxidation module, improves the stability of the microbial system in the subsequent anaerobic ammonium oxidation module, realizes low energy consumption and high efficiency biological denitrification, and makes the final system effluent meet the total nitrogen emission requirements without the need for subsequent deep denitrification. The system effluent does not require subsequent denitrification, which reduces the trouble of subsequent treatment for the high working conditions required for the discharge of total nitrogen. The struvite precipitation generated can also be sold as a slow-release fertilizer after extraction and treatment, which has economic value and can achieve resource recycling.

[0063] The technical solution of this embodiment realizes integrated phosphorus removal and nitrogen removal, greatly shortening the process flow, thereby reducing the floor space and saving investment. For wastewater conditions with low C / N ratio, high ammonia, and phosphate, compared with the existing high-load aeration and anaerobic ammonia oxidation two-in-one combination system, and the denitrification-nitrification and anaerobic ammonia oxidation combination system, it greatly reduces the operating costs and can achieve one-stop low-energy consumption, high-efficiency, deep phosphorus removal and nitrogen removal. Taking the influent ammonia nitrogen of 1000 mg / L and phosphate of 200 mg / L as an example: the total nitrogen removal rate is increased from 81.6% to 96%, the operating costs are reduced by 1.10 yuan / cubic meter of wastewater, the power consumption is reduced by 20%, and the phosphorus removal operating cost is only 0.3 yuan / cubic meter of wastewater.

[0064] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An integrated phosphorus and nitrogen removal device, characterized by: It includes a denitrification module, an aeration and phosphorus removal module and an anaerobic ammonium oxidation module, wherein the aeration and phosphorus removal module and the anaerobic ammonium oxidation module are located above the denitrification module, and the aeration and phosphorus removal module is located outside the anaerobic ammonium oxidation module; the denitrification module is provided with a water inlet pipe, and the anaerobic ammonium oxidation module is provided with a water outlet pipe. The denitrification module is connected to the aeration and phosphorus removal module through the denitrification outlet pipe, the aeration and phosphorus removal module is connected to the anaerobic ammonium oxidation module through the aeration and phosphorus removal outlet pipe, and the anaerobic ammonium oxidation module is connected to the denitrification module through the return water inlet pipe; the aeration and phosphorus removal module is provided with a magnesium hydroxide dosing pipe for adding magnesium hydroxide for phosphorus removal.

2. The integrated phosphorus and nitrogen removal device according to claim 1, characterized in that: The denitrification module includes a denitrification cylinder, which is provided with a denitrification water distributor, a diversion cylinder, a denitrification three-phase separator, and a denitrification water collection pipe from bottom to top; the bottom two sides of the denitrification cylinder are respectively connected to a water inlet pipe and a circulating water pipe, the circulating water pipe is connected to the water inlet pipe through a circulating pump; the water inlet pipe is connected to the denitrification water distributor; The top of the denitrification cylinder is connected to a denitrification exhaust pipe and a denitrification water outlet pipe; The middle and lower part of the denitrification cylinder is connected to a denitrification dosing pipe, which extends into the denitrification cylinder and is connected to the diversion cylinder; a denitrification online pH meter is provided in the middle of the denitrification cylinder; and a denitrification sludge discharge pipe is provided at the bottom of the denitrification cylinder.

3. The integrated phosphorus and nitrogen removal device according to claim 2, characterized in that: The denitrification water distributor is provided with a plurality of vertically upward nozzles, and the nozzles are located within the bottom of the guide tube; the distance between the denitrification three-phase separator and the guide tube is 500-1000 mm.

4. The integrated phosphorus and nitrogen removal device according to claim 2, characterized in that: The aeration and phosphorus removal module includes an aeration and phosphorus removal cylinder, an aeration and phosphorus removal water distribution pipe connected to the denitrification outlet pipe is provided at the bottom of the aeration and phosphorus removal cylinder, an aeration and phosphorus removal aerator is provided in the aeration and phosphorus removal cylinder, the aeration and phosphorus removal aerator is located above the aeration and phosphorus removal water distribution pipe and is connected to the aeration and phosphorus removal air pipe; an aeration and phosphorus removal guide tube is provided above the aeration and phosphorus removal aerator, and an aeration and phosphorus removal three-phase separator is provided above the aeration and phosphorus removal guide tube; the magnesium hydroxide dosing pipe passes into the aeration and phosphorus removal guide tube; the water inlet end of the aeration and phosphorus removal outlet pipe is located at the top of the aeration and phosphorus removal three-phase separator.

5. The integrated phosphorus and nitrogen removal device according to claim 4, characterized in that: The aeration and phosphorus removal module includes an aeration and phosphorus removal online DO instrument and an aeration and phosphorus removal sludge pipe. The aeration and phosphorus removal online DO instrument is inserted below the liquid level in the aeration and phosphorus removal cylinder; the aeration and phosphorus removal sludge pipe is connected to the aeration and phosphorus removal cylinder; the aeration and phosphorus removal aerator is a coarse-pore aerator.

6. The integrated phosphorus and nitrogen removal device and method according to claim 5, characterized in that: The anaerobic ammonium oxidation module comprises an anaerobic ammonium oxidation cylinder and a water collecting cylinder. An anaerobic ammonium oxidation water distribution pipe is provided at the bottom of the anaerobic ammonium oxidation cylinder, and the anaerobic ammonium oxidation water distribution pipe is connected to the aeration and phosphorus removal outlet pipe; an anaerobic ammonium oxidation aerator is provided above the anaerobic ammonium oxidation water distribution pipe, and the anaerobic ammonium oxidation aerator is communicated with the anaerobic ammonium oxidation air pipe. An anaerobic ammonium oxidation three-phase separator is provided in the middle and upper part of the anaerobic ammonium oxidation cylinder; An anaerobic ammonium oxidation outlet pipe is provided on the top of the anaerobic ammonium oxidation three-phase separator, and the anaerobic ammonium oxidation outlet pipe is connected to the water collecting cylinder; the upper part of the water collecting cylinder is connected to the outlet pipe; the bottom of the water collecting cylinder is connected to the return water inlet pipe through the outlet return pipe; a heat exchange pipe is provided in the anaerobic ammonium oxidation cylinder, and the two ends of the heat exchange pipe are respectively connected to the hot water inlet pipe and the hot water return pipe; the upper part of the anaerobic ammonium oxidation cylinder is provided with an anaerobic ammonium oxidation pH dosing pipe and a trace element dosing pipe.

7. The integrated phosphorus and nitrogen removal device according to claim 6, characterized in that: The anaerobic ammonium oxidation module includes an anaerobic ammonium oxidation online thermometer, an anaerobic ammonium oxidation online pH meter, and an anaerobic ammonium oxidation online DO meter. The anaerobic ammonium oxidation online thermometer, anaerobic ammonium oxidation online pH meter, and anaerobic ammonium oxidation online DO meter are inserted below the liquid level in the anaerobic ammonium oxidation cylinder; a booster pump is provided between the outlet return pipe and the return water inlet pipe; the bottom of the water collecting cylinder is in an inverted cone shape; and the anaerobic ammonium oxidation aerator is a microporous aerator.

8. The integrated phosphorus and nitrogen removal device according to claim 7, characterized in that: The diameter of the denitrification cylinder is equal to that of the anaerobic ammonium oxidation cylinder and is smaller than the outer diameter of the aeration and phosphorus removal cylinder. The bottom of the aeration and phosphorus removal cylinder is in an inverted cone shape.

9. The integrated phosphorus and nitrogen removal method is characterized by: The wastewater is transported to the integrated dephosphorization and denitrification device as claimed in claim 7 or 8 through a water inlet pipe for treatment, and magnesium hydroxide is added to the magnesium hydroxide dosing pipe.

10. The integrated phosphorus and nitrogen removal method according to claim 9, characterized in that: The pH of the liquid in the denitrification cylinder is monitored in real time by the denitrification online pH meter, and the amount of acid added in the denitrification dosing pipe is adjusted to control the pH of the liquid in the denitrification cylinder to be 6.5-7.5; According to the feedback result of the aeration dephosphorization online DO instrument, the air supply in the aeration dephosphorization air pipe is adjusted to control the dissolved oxygen on the liquid surface in the aeration dephosphorization cylinder to be 0.3-0.5 mg / L; According to the feedback result of the anaerobic ammonium oxidation online thermometer, the hot water volume or water temperature of the hot water inlet pipe is adjusted to control the water temperature of the liquid in the anaerobic ammonium oxidation cylinder to 33-38°C; According to the feedback result of the anaerobic ammonium oxidation online pH meter, the dosage in the anaerobic ammonium oxidation pH dosing tube is adjusted to control the pH of the liquid in the anaerobic ammonium oxidation cylinder to 7.5-8.0; The air supply in the anaerobic ammonium oxidation air pipe is adjusted according to the feedback result of the anaerobic ammonium oxidation online DO instrument, and the dissolved oxygen in the liquid in the anaerobic ammonium oxidation cylinder is controlled to be below 0.3 mg / L.

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