Synchronous PD-Anammox biological denitrification device

Abstract

The utility model discloses a synchronous PD-Anammox biological denitrification device which comprises a domestic sewage storage tank, a water inlet submersible pump and a water bathtub, and an integrated double-layer SBR (sequencing batch reactor) is mounted in the water bathtub; a filter screen is mounted in the integrated double-layer SBR reactor, the integrated double-layer SBR reactor is divided into an Anammox biological membrane area and a stirring area by the filter screen, and a short-cut denitrification activated sludge area, a clarified water area and a water inlet area are sequentially arranged in the stirring area from bottom to top; according to the integrated double-layer SBR reactor disclosed by the utility model, the sludge age is prolonged by utilizing the growth characteristic that the Anammox biological membrane fixes anaerobic ammonium oxidation bacteria, the carrier filler attached with the Anammox biological membrane is isolated at the bottom of the integrated double-layer SBR reactor through the filter screen, and domesticated short-cut denitrification activated sludge is added into the upper layer, so that chemical oxygen demand can be quickly consumed, NO2--N can be accumulated at the same time, and the anaerobic ammonium oxidation bacteria can be quickly degraded. The generated NO2 <->-N can be timely utilized and removed by anaerobic ammonium oxidation, so that integrated synchronous PD-Anammox is realized, the growth rates of anaerobic ammonium oxidation bacteria and denitrifying bacteria are consistent, and advanced treatment of ammonia nitrogen and nitrate nitrogen in sewage is realized.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to biological denitrification devices, specifically a biological denitrification device with synchronous PD-Anammox. Background Technology

[0002] In recent years, eutrophication caused by excessively high nitrogen and phosphorus concentrations in water bodies has become increasingly serious, significantly impacting aquatic ecosystems and human health. Therefore, my country has imposed stricter requirements on the effluent quality of urban wastewater treatment plants, particularly regarding nitrogen and phosphorus content control. According to the wastewater discharge standards promulgated in 2002, the effluent from urban wastewater treatment plants must meet the Class A standard, with a total nitrogen content of less than 15 mg / L.

[0003] Among various nitrogen removal methods, biological nitrogen removal is the most efficient and economical. Traditional nitrogen removal processes, based on the nitrification-denitrification principle, are widely used in urban wastewater treatment plants. However, this process suffers from problems such as high sludge production, high energy consumption, and insufficient carbon sources. Especially when treating urban wastewater with a low carbon-to-nitrogen ratio, an external carbon source is required to improve treatment efficiency, further increasing operating costs. In contrast, anammox technology, due to its lack of need for an external carbon source, low energy consumption, and small sludge production, is considered a promising new nitrogen removal technology.

[0004] The application of Anammox is usually limited by the stable supply of nitrite nitrogen. Therefore, combining short-cut denitrification (PD) with Anammox technology provides a new solution for wastewater treatment. However, due to the low growth rate of Anammox (doubling time of 11-19 days), under high organic matter concentration conditions, the growth rate of denitrifying bacteria is significantly higher than that of anaerobic ammonia oxidizing bacteria. This may lead to denitrifying bacteria replacing anaerobic ammonia oxidizing bacteria, thereby affecting the nitrogen removal efficiency of the system. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a synchronous PD-Anammox biological denitrification device to solve the technical problem of inconsistent growth rates between anaerobic ammonia-oxidizing bacteria and denitrifying bacteria in existing biological denitrification devices.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A biological denitrification device with synchronous PD-Anammox includes a domestic sewage storage tank, in which an inlet submersible pump is placed. The inlet submersible pump is connected to one end of an inlet pipe through a first pipe. The other end of the inlet pipe extends horizontally into a water bath. An integrated double-layer SBR reactor is installed in the water bath. The other end of the inlet pipe is connected to one side wall of the integrated double-layer SBR reactor.

[0008] The integrated double-layer SBR reactor is equipped with a filter screen, which divides the integrated double-layer SBR reactor into upper and lower layers. The lower layer is the Anammox biofilm area, and the upper layer is the stirring area. The bottom of the stirring area is the short-cut denitrification activated sludge area, the area above the short-cut denitrification activated sludge area is the clarified water area, and the area above the clarified water area is the inlet water area.

[0009] The other side wall of the integrated double-layer SBR reactor is connected to one end of the outlet pipe, and the other end of the outlet pipe is connected to the outlet peristaltic pump through a second pipe. The outlet peristaltic pump is connected to the outlet water tank through a third pipe.

[0010] This utility model also has the following technical features:

[0011] The volume ratio of the Anammox biofilm zone, the short-cut denitrification activated sludge zone, and the clarified water zone is 1:1:2.

[0012] The integrated double-layer SBR reactor is equipped with a sealing cover on the top. The sealing cover has a pH probe hole, a dissolved oxygen probe hole, a liquid level relay hole, and a stirring hole. A pH probe is installed in the pH probe hole, a dissolved oxygen probe is installed in the dissolved oxygen probe hole, a liquid level relay is installed in the liquid level relay hole, and a stirrer is installed in the stirring hole.

[0013] One end of the pH probe and dissolved oxygen probe extends into the clarified water area, and the other end of the pH probe and dissolved oxygen probe is connected to the pH and dissolved oxygen meter. One end of the liquid level relay is in contact with the interface of the clarified water area.

[0014] The bathtub is equipped with a water heater.

[0015] One side wall of the integrated double-layer SBR reactor is also connected to one end of the clarified water sampling pipe, and the other end of the clarified water sampling pipe extends out of the water bath.

[0016] The other side wall of the integrated double-layer SBR reactor is also connected to one end of the short-cut denitrification activated sludge sampling pipe and the anammox sludge sampling pipe, and the other end of the short-cut denitrification activated sludge sampling pipe and the anammox sludge sampling pipe extends out of the water bath.

[0017] The water inlet is located in the lower part of the water inlet area, and the clarified water sampling port is located in the lower part of the clarified water area.

[0018] The sampling port of the short-cut denitrification activated sludge is located in the lower part of the short-cut denitrification activated sludge area, and the sampling port of the anammox sludge is located in the lower part of the Anammox biofilm area.

[0019] The water outlet is located at the bottom of the clarified water area.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] (I) The biological denitrification device proposed in this invention utilizes the growth characteristics of anaerobic ammonia-oxidizing bacteria immobilized by Anammox biofilm to extend sludge time (SRT) and thus maintain effective biomass. The carrier packing material with attached Anammox biofilm is isolated at the bottom of an integrated double-layer SBR reactor through a filter screen, and acclimated short-cut denitrification activated sludge is added to the upper layer, which can rapidly consume chemical oxygen demand (COD) while accumulating NO2. - -N, producing NO2 - -N can be utilized and removed by anaerobic ammonia oxidizing bacteria in a timely manner, thereby realizing integrated synchronous PD-Anammox, which keeps the growth rate of anaerobic ammonia oxidizing bacteria and short-cut denitrifying bacteria consistent, achieving deep treatment of organic matter, ammonia nitrogen and nitrate nitrogen in wastewater, and is simpler and easier to operate and lower in cost than split-type processes.

[0022] (II) The short-cut denitrification activated sludge-anaerobic ammonia oxidation biofilm composite process proposed in this utility model not only has a stable and efficient biological nitrogen removal effect, but also greatly reduces sludge production compared with the traditional activated sludge process.

[0023] (III) This utility model achieves deep denitrification of low pH, high matrix wastewater. Compared with a single anaerobic ammonia oxygen device or a traditional nitrification-denitrification device, the nitrogen concentration of the effluent is greatly reduced. It does not require aerobic aeration or post-carbon source addition and can be directly discharged without post-treatment, which greatly increases the economic efficiency of wastewater treatment. Attached Figure Description

[0024] Figure 1 A schematic diagram of a biological denitrification device for synchronizing PD-Anammox.

[0025] The labels in the diagram represent the following: 1-Domestic sewage storage tank; 2-Inlet submersible pump; 3-First pipe; 4-Inlet pipe; 5-Water bath; 6-Integrated double-layer SBR reactor; 7-Filter screen; 8-Anammox biofilm zone; 9-Agitation zone; 10-Outlet pipe; 11-Second pipe; 12-Outlet peristaltic pump; 13-Third pipe; 14-Outlet water tank; 15-Sealing cover; 16-pH probe; 17-Dissolved oxygen probe; 18-Level relay; 19-Agitator; 20-pH and dissolved oxygen meter; 21-Controller; 22-Agitator blades; 23-Water bath heater; 24-Clarified water sampling port; 25-Short-cut denitrification activated sludge sampling port; 26-Anaerobic ammonium oxidation sludge sampling port.

[0026] 901 - Short-cut denitrification activated sludge zone; 902 - Clarified water zone; 903 - Influent zone.

[0027] 1501 - pH probe hole, 1502 - dissolved oxygen probe hole, 1503 - liquid level relay hole, 1504 - stirring hole.

[0028] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, all equipment and materials in this utility model are based on existing technologies.

[0030] In this embodiment, the VSS / SS ratio represents the content of volatile substances in short-cut denitrification activated sludge and anaerobic ammonium oxidation sludge.

[0031] In this invention, SBR is short for Sequencing Batch Activated Sludge Process.

[0032] In this invention, the UASB (Up-flow Anaerobic Sludge Bed) reactor is an upflow anaerobic sludge bed.

[0033] The working principle of this invention is that under low pH influent conditions, the PD activated sludge, which has been acclimated in the early stage, can quickly utilize the organic matter in the influent to reduce nitrate nitrogen to nitrite nitrogen, thereby temporarily accumulating nitrite. The generated nitrite nitrogen is then utilized by the Anammox biofilm fixed on the surface of the carrier packing through anaerobic ammonia oxidation, and is removed together with the ammonia nitrogen in the wastewater. The small amount of nitrate nitrogen generated is then denitrified by the PD activated sludge into nitrite nitrogen, which then participates in the anaerobic ammonia oxidation reaction, ultimately achieving efficient biological denitrification.

[0034] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0035] Example 1:

[0036] This embodiment provides a biological denitrification device with synchronized PD-Anammox, including a domestic sewage storage tank 1, such as... Figure 1 As shown, a submersible pump 2 is placed inside a domestic sewage storage tank 1. The submersible pump 2 is connected to one end of an inlet pipe 4 through a first pipe 3. The other end of the inlet pipe 4 extends horizontally into a water bath 5. An integrated double-layer SBR reactor 6 is installed inside the water bath 5. The other end of the inlet pipe 4 is connected to one side wall of the integrated double-layer SBR reactor 6.

[0037] In this embodiment, the domestic sewage storage tank 1 is specifically configured to contain artificially prepared low-pH simulated domestic sewage.

[0038] like Figure 1 As shown, a filter screen 7 is fixedly installed inside the integrated double-layer SBR reactor 6. The filter screen 7 divides the integrated double-layer SBR reactor 6 into upper and lower layers. The lower layer is the Anammox biofilm zone 8, and the upper layer is the stirring zone 9. The bottom of the stirring zone 9 is the short-cut denitrification activated sludge zone 901. Above the short-cut denitrification activated sludge zone 901 is the clarified water zone 902, and above the clarified water zone 902 is the influent zone 903.

[0039] Specifically, in this embodiment, the Anammox biofilm zone 8 contains a carrier packing material on which the Anammox biofilm that has been acclimatized in the early stage is attached; the short-cut denitrification activated sludge zone 901 contains short-cut denitrification activated sludge.

[0040] In this embodiment, the filter 7 divides the integrated double-layer SBR reactor 6 into an Anammox biofilm zone 8 and a stirring zone 9, thereby reducing the cutting and peeling effect of the stirring zone 9 on the bottom Anammox biofilm. At the same time, the Anammox biofilm formed in the Anammox biofilm zone 8 extends the sludge age of Anammox bacteria, thus adapting to the sludge age of PD bacteria in the overall short-cut denitrification process.

[0041] In this embodiment, the carrier packing material is specifically K3 or K5 packing material, with a diameter of 2.5 cm and a specific surface area of ​​500–800 m². 2 / m 3 The carrier packing material has a filling rate of 20% to 25% in the integrated double-layer SBR reactor 6.

[0042] In this embodiment, K3 packing material is preferably used, with a diameter of 2.5 cm and a specific surface area of ​​700 m². 2 / m 3 The carrier packing material has a filling rate of 25% in the integrated double-layer SBR reactor 6.

[0043] Specifically in this embodiment, the Anammox biofilm is pre-acclimated to the pH level (4.5-5.5) of the acidic influent.

[0044] In this embodiment, the preferred method is to pre-acclimate the Anammox biofilm to the pH level (5.5) of the acidic influent.

[0045] In this embodiment, the integrated double-layer SBR reactor 6 is preferably made of plexiglass, and the effective volume of the integrated double-layer SBR reactor 6 is 2L.

[0046] Specifically, in this embodiment, the short-cut denitrification activated sludge is acclimatized in advance to adapt to the pH of the acidic influent (pH 4.5-5.5), and the nitrite accumulation rate in the short-cut denitrification activated sludge zone 901 is 70%-90%.

[0047] In this embodiment, the preferred method is to pre-acclimate the short-cut denitrification activated sludge to a pH level of 5.5 suitable for acidic influent conditions.

[0048] like Figure 1 As shown, the other side wall of the integrated double-layer SBR reactor 6 is connected to one end of the outlet pipe 10, and the other end of the outlet pipe 10 is connected to the outlet peristaltic pump 12 through the second pipe 11. The outlet peristaltic pump 12 is connected to the outlet water tank 14 through the third pipe 13.

[0049] In this embodiment, the preferred embodiment is as follows: Figure 1 As shown, the volume ratio of Anammox biofilm zone 8, short-cut denitrification activated sludge zone 901, and clarified water zone 902 is 1:1:2.

[0050] like Figure 1 As shown, the top of the integrated double-layer SBR reactor 6 is equipped with a sealing cover 15. The sealing cover 15 has a pH probe hole 1501, a dissolved oxygen probe hole 1502, a liquid level relay hole 1503, and a stirring hole 1504. A pH probe 16 is installed in the pH probe hole 1501, a dissolved oxygen probe 17 is installed in the dissolved oxygen probe hole 1502, a liquid level relay 18 is installed in the liquid level relay hole 1503, and a stirrer 19 is installed in the stirring hole 1504.

[0051] like Figure 1As shown, one end of the pH probe 16 and the dissolved oxygen probe 17 extends into the clarified water area 902, and the other end of the pH probe 16 and the dissolved oxygen probe 17 is connected to the pH and dissolved oxygen meter 20. One end of the liquid level relay 18 is in contact with the interface of the clarified water area 902.

[0052] Specifically, in this embodiment, the pH and dissolved oxygen meter 20 monitors the changes in pH and dissolved oxygen in real time during the translation process through the pH probe 16 and the dissolved oxygen probe 17; the liquid level relay 18 is used to control the liquid level so that the influent stops when it reaches the set height; the stirrer 19 is used to provide the mixing reaction power so that the influent of the integrated double-layer SBR reactor 6 is completely mixed with the short-cut denitrification activated sludge for full contact reaction; the sealing cover 15 is used to seal and thus provide an anoxic environment for the integrated double-layer SBR reactor 6.

[0053] like Figure 1 As shown, the other end of the level relay 18 is connected to the controller 21, and the stirring blades 22 on the stirrer 19 stir inside the clarified water zone 902. The controller 21 controls the inlet submersible pump 2, the stirrer 19, and the outlet peristaltic pump 12. The controller 21 controls the reaction cycle of the integrated double-layer SBR reactor 6, so that the short-cut denitrification activated sludge follows the cycle reaction time of the integrated double-layer SBR reactor 6 for water intake, reaction, sedimentation, and effluent (sludge discharge).

[0054] like Figure 1 As shown, a water bath heater 23 is installed on the water bath 5. The water bath heater 23 is used to control the reaction temperature and ensure that the temperature inside the integrated double-layer SBR reactor 6 is constant at 25°C.

[0055] like Figure 1 As shown, one side wall of the integrated double-layer SBR reactor 6 is also connected to one end of the clarified water sampling port 24, and the other end of the clarified water sampling port 24 extends out of the water bath 5.

[0056] like Figure 1 As shown, the other sidewall of the integrated double-layer SBR reactor 6 is also connected to one end of the short-cut denitrification activated sludge sampling port 25 and the anammox sludge sampling port 26, and the other ends of the short-cut denitrification activated sludge sampling port 25 and the anammox sludge sampling port 26 extend out of the water bath 5.

[0057] like Figure 1 As shown, the water inlet 4 is located in the lower part of the water inlet area 903, and the clarified water sampling port 24 is located in the lower part of the clarified water area 902.

[0058] In this embodiment, the preferred embodiment is as follows: Figure 1 As shown, the water outlet 10 is located at the bottom of the clarified water area 902.

[0059] like Figure 1As shown, the sampling port 25 of the short-cut denitrification activated sludge is located in the lower part of the short-cut denitrification activated sludge zone 901, and the sampling port 26 of the anammox sludge is located in the lower part of the Anammox biofilm zone 8.

[0060] In this embodiment, the method for treating high-nitrogen wastewater and municipal sewage using the synchronous PD-Anammox biological denitrification device is implemented using the aforementioned synchronous PD-Anammox device. The artificially prepared wastewater containing nitrates and ammonia nitrogen is added to the sewage storage tank 1. The controller 21 controls the submersible pump 2 to pump the wastewater containing nitrates and ammonia nitrogen into the integrated double-layer SBR reactor 6, where it is completely mixed with the short-cut denitrification activated sludge. The controller 21 controls the stirrer 19 to agitate the mixture. The controller 21 controls the periodic reaction within the integrated double-layer SBR reactor 6. During the reaction, samples are taken and tested through the clarified water sampling port 24, and sludge is taken and tested through the short-cut denitrification activated sludge sampling port 25 and the anaerobic ammonia oxidation sludge sampling port 26. After the reaction ends, the sedimentation stage begins. The short-cut denitrification activated sludge settles to half the height of the effective volume of the integrated double-layer SBR reactor 6. The clarified water is discharged into the effluent tank 14 through the effluent peristaltic pump 12. The discharge ratio of the effluent peristaltic pump 12 is between 0.5 and 0.6.

[0061] In this embodiment, the reaction in the integrated double-layer SBR reactor 6 is carried out in cycles, with 4 cycles per day and a single cycle of 6 hours. Specifically, the cycle consists of: 5 minutes of water inlet, 240 minutes of stirring, 60 minutes of sedimentation, 5 minutes of drainage, and 50 minutes of idle time.

[0062] In this embodiment, the artificially prepared wastewater containing nitrates and ammonia nitrogen was prepared by adjusting the influent pH to 5.5 using HCl and NaOH. The carbon source and nitrogen source were anhydrous sodium acetate (CH3COONa), potassium nitrate (KNO3), and ammonium chloride (NH4Cl), respectively. The remaining water-mixing matrix consisted of KH2PO4, MgSO4·7H2O, CaCl2, NH4Cl, and trace elements. 1 mL of trace elements was added per liter of wastewater. All the test reagents used in this embodiment were of analytical grade and were known in the prior art.

[0063] In this embodiment, the concentrations of both short-cut denitrification activated sludge and anaerobic ammonium oxidation sludge were maintained at 3000–3500 mg·L⁻¹ during the experiment. -1 (VSS / SS≈0.7), during the stable operation phase of the integrated double-layer SBR reactor 6, the sludge-water mixture is discharged daily after the periodic stirring, so that the short-cut denitrification activated sludge age (SRT) and anaerobic ammonia oxidation sludge age (SRT) are controlled at about 15 days.

[0064] Example 2:

[0065] This embodiment uses the apparatus and method proposed in Example 1 to denitrify artificially prepared laboratory wastewater. The artificially prepared laboratory wastewater used in this embodiment is prepared with anhydrous sodium acetate (CH3COONa), potassium nitrate (KNO3), and ammonium chloride (NH4Cl), with specific water qualities of: COD 200 mg / L, NO3... - -N 50 mg / L, NH4 + -N 40mg / L, the remaining water-mixing substrates are KH2PO4, MgSO4·7H2O, CaCl2, NH4Cl and trace elements.

[0066] Specifically, in this embodiment, the effective volume of the integrated double-layer SBR reactor 6 is 2L; the short-cut denitrification activated sludge is taken from a short-cut denitrification SBR reactor that has been acclimated in the laboratory and has been running stably for more than 300 cycles; the short-cut denitrification activated sludge taken from the short-cut denitrification SBR reactor can maintain a nitrite accumulation rate of 70% to 90%; after inoculation with the short-cut denitrification activated sludge, the sludge concentration of the integrated double-layer SBR reactor 6 reaches 3000 to 3500 mg / L; the anaerobic ammonia oxidation sludge is taken from a UASB reactor that has been running stably in the laboratory for 300 days, and the filling rate of the carrier packing after inoculation is 20%.

[0067] Specifically, in this embodiment, the internal temperature of the integrated double-layer SBR reactor 6 is maintained at 25°C through the water bath 5, and the short-cut denitrification activated sludge age (SRT) and anammox sludge age (SRT) in the integrated double-layer SBR reactor 6 are maintained at 15 days through the effluent peristaltic pump 12. The concentrations of short-cut denitrification activated sludge and anammox sludge in the integrated double-layer SBR reactor 6 are maintained at 3000-3500 mg / L. The effluent quality in the integrated double-layer SBR reactor 6 is measured daily, and the TN (total nitrogen) removal rate is calculated.

[0068] Table 1. Reactor water quality parameters in Example 1

[0069] Project Name COD (mg / L) <![CDATA[NH4 + -N(mg / L)]]> <![CDATA[NO3 - -N(mg / L)]]> TN (mg / L) Influent water quality 200 40 50 90 effluent water quality 39.5 1.68 0.02 1.77 Removal rate (%) 80.25％ 95.80％ 99.96％ 98.03％

[0070] The changes in nitrogen concentration in the influent and effluent during the experimental operation are shown in Table 1. As can be seen from Table 1, the final TN removal rate of the effluent reached 98.03%, and the TN concentration in the effluent was only 1.77 mg / L. This demonstrates that the device and method of this embodiment can achieve stable and efficient biological denitrification of wastewater.

Claims

1. A biological denitrification device with synchronous PD-Anammox, comprising a domestic sewage storage tank (1), characterized in that, The aforementioned configuration includes a domestic sewage storage tank (1) containing an inlet submersible pump (2), which is connected to one end of an inlet pipe (4) via a first pipe (3). The other end of the inlet pipe (4) extends horizontally into a water bath (5), which contains an integrated double-layer SBR reactor (6). The other end of the inlet pipe (4) is connected to one side wall of the integrated double-layer SBR reactor (6). The integrated double-layer SBR reactor (6) is fixedly installed with a filter screen (7). The filter screen (7) divides the integrated double-layer SBR reactor (6) into upper and lower layers. The lower layer is the Anammox biofilm area (8), and the upper layer is the stirring area (9). The bottom of the stirring area (9) is the short-cut denitrification activated sludge area (901). Above the short-cut denitrification activated sludge area (901) is the clarified water area (902), and above the clarified water area (902) is the inlet water area (903). The other side wall of the integrated double-layer SBR reactor (6) is connected to one end of the outlet pipe (10), and the other end of the outlet pipe (10) is connected to the outlet peristaltic pump (12) through the second pipe (11). The outlet peristaltic pump (12) is connected to the outlet water tank (14) through the third pipe (13).

2. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The volume ratio of the Anammox biofilm zone (8), the short-cut denitrification activated sludge zone (901), and the clarified water zone (902) is 1:1:

2.

3. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The integrated double-layer SBR reactor (6) is provided with a sealing cover (15) on the top. The sealing cover (15) is provided with a pH probe hole (1501), a dissolved oxygen probe hole (1502), a liquid level relay hole (1503) and a stirring hole (1504). A pH probe (16) is installed in the pH probe hole (1501), a dissolved oxygen probe (17) is installed in the dissolved oxygen probe hole (1502), a liquid level relay (18) is installed in the liquid level relay hole (1503), and a stirrer (19) is installed in the stirring hole (1504). One end of the pH probe (16) and dissolved oxygen probe (17) extends into the clarified water area (902), and the other end of the pH probe (16) and dissolved oxygen probe (17) is connected to the pH and dissolved oxygen meter (20). One end of the liquid level relay (18) is in contact with the interface of the clarified water area (902).

4. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The water bath (5) is equipped with a water heater (23).

5. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, One side wall of the integrated double-layer SBR reactor (6) is also connected to one end of the clarified water sampling port (24), and the other end of the clarified water sampling port (24) extends out of the water bath (5).

6. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The other side wall of the integrated double-layer SBR reactor (6) is also connected to one end of the short-cut denitrification activated sludge sampling port (25) and the anammox sludge sampling port (26), and the other end of the short-cut denitrification activated sludge sampling port (25) and the anammox sludge sampling port (26) extends out of the water bath (5).

7. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The water inlet (4) is located in the lower part of the water inlet area (903), and the clarified water sampling port (24) is located in the lower part of the clarified water area (902).

8. The biological denitrification device with simultaneous PD-Anammox as described in claim 6, characterized in that, The short-cut denitrification activated sludge sampling port (25) is located in the lower part of the short-cut denitrification activated sludge area (901), and the anammox sludge sampling port (26) is located in the lower part of the Anammox biofilm area (8).

9. The biological denitrification device with simultaneous PD-Anammox as described in claim 1, characterized in that, The water outlet (10) is located at the bottom of the clarified water area (902).

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