A continuous current electro-anaerobic ammonia oxidation denitrification system

Abstract

This invention discloses a continuous-flow electro-anaerobic ammonia oxidation (ANAO) denitrification system. Addressing the problem of unstable dissolved electron acceptor supply in ANAO processes applied to mainstream wastewater denitrification, the invention comprises a reactor body, supporting devices, and a denitrification method. Upon startup, the system initially promotes the formation of an ANAO biofilm on the carbon fiber brush surface under conditions of externally added nitrite and disconnection of the external circuit. After biofilm formation, no further nitrite is added to the influent substrate of the continuous-flow electro-anaerobic ammonia oxidation denitrification system. The carbon fiber brushes are connected to the positive and negative terminals of an external DC regulated power supply, operating under a constant applied voltage. This denitrification system avoids the problem of unstable nitrite supply in other ANAO coupled processes by directly using electrodes instead of traditional nitrite as the electron acceptor for ANAO bacteria, providing a new method for ANAO technology in mainstream wastewater denitrification. This invention belongs to the field of wastewater denitrification technology.

Description

Technical Field

[0001] This invention relates to a denitrification system, specifically a continuous flow electro-anaerobic ammonia oxidation denitrification system, and belongs to the field of wastewater denitrification technology. Background Technology

[0002] Anaerobic ammonia oxidation (AAO), as an emerging nitrogen removal technology, has advantages such as being green and efficient compared to traditional nitrification-denitrification processes. With the continuous advancement of energy conservation and emission reduction, AAO and its coupled processes are gradually replacing traditional nitrification-denitrification processes for nitrogen removal from industrial wastewater such as landfill leachate, pig farm wastewater, and sludge dewatering liquid, as well as wastewater from the side streams of sewage treatment plants.

[0003] Compared to industrial and sidestream wastewater, mainstream wastewater has a larger discharge volume, and the ammonia nitrogen emissions from domestic sources are far higher than those from industrial sources. Therefore, applying anammox to mainstream wastewater denitrification will generate significant environmental and economic benefits. However, the nitrogen in mainstream wastewater is mainly in the form of ammonia nitrogen, lacking nitrite, the electron acceptor required for the growth of anammox bacteria. Previous studies have therefore coupled anammox with other nitrite-producing pretreatment processes, ultimately achieving denitrification through anammox. Short-cut nitrification can convert ammonia nitrogen to nitrite and is currently the most widely studied pretreatment method. However, due to the low ammonia nitrogen concentration in mainstream wastewater, it is difficult to inhibit nitrifying bacteria from further oxidizing nitrite to nitrate, making it difficult to stably provide electron acceptors for anammox bacteria. Therefore, anammox has not yet been widely applied to mainstream wastewater denitrification. With further research, researchers have discovered that anammox bacteria can use conductive carbon-based materials as electron acceptors, providing a new approach for using anammox for ammonia nitrogen wastewater denitrification. However, current research is still in the theoretical stage, and there is a lack of reaction systems capable of continuous flow denitrification. Summary of the Invention

[0004] To address the problem of unstable dissolved electron acceptor supply in the application of anaerobic ammonia oxidation (AA) technology to mainstream wastewater denitrification processes, this invention proposes a continuous electro-anaerobic ammonia oxidation denitrification system and provides a method for operating the system.

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

[0006] This invention includes a continuous current-current anaerobic ammonia oxidation denitrification system, comprising a reactor body and supporting devices. The reactor body includes a water distribution zone, a reaction zone, and a three-phase separation zone. The supporting devices include an inlet tank, an outlet tank, a DC regulated power supply, a voltage data acquisition system, and a resistor. The water distribution zone, reaction zone, and three-phase separation zone are arranged sequentially from bottom to top. An anode carbon fiber brush and a cathode carbon fiber brush are arranged sequentially from bottom to top within the reaction zone. The anode carbon fiber brush is connected to the positive terminal of the DC regulated power supply; the cathode carbon fiber brush is connected to the negative terminal of the DC regulated power supply. The anode carbon fiber brush, cathode carbon fiber brush, resistor, and DC regulated power supply are connected in series, and the voltage data acquisition system is connected in parallel to the resistor. The sampling port at the top of the reaction zone is connected to the inlet of the water distribution zone through a first connecting pipe. The inlet tank is connected to the inlet at the bottom of the reaction zone through a second connecting pipe. The outlet of the three-phase separation zone is connected to the outlet tank through a U-shaped pipe.

[0007] Furthermore, a safe distance of more than 3 cm is maintained between the anode carbon fiber brush and the cathode carbon fiber brush.

[0008] Furthermore, both the anode carbon fiber brush and the cathode carbon fiber brush are composed of conductive carbon fibers and titanium wires, with the titanium wires serving as the skeleton and the conductive carbon fibers used to attach microbial films.

[0009] Furthermore, both the first and second connecting pipes are equipped with peristaltic pumps.

[0010] Furthermore, the inlet and outlet water tanks are made of plexiglass, have a cylindrical structure, and are equipped with nitrogen bags to balance air pressure.

[0011] Furthermore, the main body of the reactor is made of plexiglass.

[0012] The continuous current electro-anaerobic ammonia oxidation denitrification method is carried out through the following steps:

[0013] Step 1: Select anaerobic ammonia oxidation sludge as inoculum. Under the condition of disconnection of external circuit, add ammonia nitrogen and nitrite to the influent of the reactor body according to the theoretical ratio of anaerobic ammonia oxidation to promote the formation of anaerobic ammonia oxidation biofilm on the surface of anode carbon fiber brush and cathode carbon fiber brush in the reactor body.

[0014] Step 2: After observing the formation of the anaerobic ammonia oxidation biofilm in the reactor body and the high overall denitrification efficiency of the reactor, no more nitrite is added to the influent. The reaction system is then switched to the electro-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors and operated under constant applied voltage conditions.

[0015] Step 3: After the wastewater passes through the deoxygenation process, it is added to the inlet tank, and then enters the main body of the continuous flow electro-anaerobic ammonia oxidation denitrification reactor through a peristaltic pump. After the denitrification reaction, it enters the outlet tank through the three-phase separation zone, completing the entire operation process.

[0016] Furthermore, during the operation of the reactor in the electro-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors, the output voltage of the external DC regulated power supply was set to 0.6V, and a voltage data acquisition card was used to record the voltage across the resistor during operation.

[0017] The beneficial effects of this invention are:

[0018] 1. The continuous electro-anaerobic ammonia oxidation denitrification system designed in this application directly uses electrodes to replace traditional nitrite as the electron acceptor for anaerobic ammonia oxidizing bacteria. Compared with other anaerobic ammonia oxidation coupled processes, it can avoid the problem of unstable electron acceptor supply in the denitrification process of mainstream wastewater, and provides a new method for applying anaerobic ammonia oxidation technology to denitrification of mainstream wastewater.

[0019] 2. By analyzing the results of the two specific embodiments, it can be found that the continuous flow electro-anaerobic ammonia oxidation denitrification system designed in this application not only achieves denitrification of mainstream wastewater under continuous flow conditions, but also maintains the relative abundance of anaerobic ammonia oxidizing bacteria in the reaction system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the continuous current-anaerobic ammonia oxidation denitrification system of the present invention.

[0021] Figure 2 This is a schematic longitudinal section of the continuous current-ionized anaerobic ammonia oxidation denitrification reactor of the present invention. Detailed Implementation

[0022] Specific implementation method one: Combining Figure 1 and Figure 2 This embodiment describes a continuous current-current anaerobic ammonia oxidation denitrification system, comprising a reactor body and supporting devices. The reactor body includes a water distribution zone 1, a reaction zone, and a three-phase separation zone 4. The supporting devices include an inlet tank 5, an outlet tank 6, a DC regulated power supply 7, a voltage data acquisition system 9, and a resistor 10. The water distribution zone 1, reaction zone, and three-phase separation zone 4 are arranged sequentially from bottom to top. In the reaction zone, an anode carbon fiber brush 2 and a cathode carbon fiber brush 3 are arranged sequentially from bottom to top. The anode carbon fiber brush 2 is connected to the positive terminal of the DC regulated power supply 7; the cathode carbon fiber brush 3 is connected to the negative terminal of the DC regulated power supply 7. The anode carbon fiber brush 2, cathode carbon fiber brush 3, resistor 10, and DC regulated power supply are connected in series. The voltage data acquisition system 9 is connected in parallel to resistor 10. The sampling port at the top of the reaction zone is connected to the inlet of the water distribution zone 1 through a first connecting pipe. The inlet tank 5 is connected to the inlet at the bottom of the reaction zone through a second connecting pipe. The outlet of the three-phase separation zone 4 is connected to the outlet tank 6 through a U-shaped pipe.

[0023] Specific Implementation Method Two: Combining Figure 1 and Figure 2 In this embodiment, the anode carbon fiber brush 2 and the cathode carbon fiber brush 3 maintain a safe distance of more than 3 cm.

[0024] Instead of using a selectively permeable membrane to separate the two electrodes, a certain distance is maintained to prevent short circuits.

[0025] The other components and connections in this embodiment are the same as in Specific Embodiment 1.

[0026] Specific implementation method three: Combining Figure 1 and Figure 2 This embodiment describes a method where both the anode carbon fiber brush 2 and the cathode carbon fiber brush 3 are composed of conductive carbon fiber and titanium wire. The titanium wire serves as the skeleton, and the conductive carbon fiber is used to attach the microbial membrane. The length of the anode carbon fiber brush 2 and the cathode carbon fiber brush 3 is 10 cm, and the diameter is 3 cm.

[0027] Two carbon fiber brushes, composed of conductive carbon fiber and titanium wire, are set inside the reaction zone as electrodes. The titanium wire has both conductivity and corrosion resistance, while the conductive carbon fiber has good biocompatibility and conductivity.

[0028] The other components and connections in this embodiment are the same as in specific embodiment one or two.

[0029] Specific implementation method four: Combination Figure 1 This embodiment describes a peristaltic pump 8 that is provided on both the first connecting pipe and the second connecting pipe.

[0030] The other components and connections in this embodiment are the same as those in specific embodiments one, two, or three.

[0031] Specific Implementation Method Five: Combining Figure 1 This embodiment describes a water inlet tank 5 and a water outlet tank 6 made of plexiglass, with a cylindrical structure and a volume of 785ml each, and equipped with a nitrogen bag to balance the air pressure.

[0032] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, or four.

[0033] Specific Implementation Method Six: Combination Figure 1 This embodiment describes a reactor body made of plexiglass.

[0034] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, or five.

[0035] Specific implementation method seven: Combination Figure 1 and Figure 2This embodiment describes a continuous current-current electro-anaerobic ammonia oxidation denitrification method, which is carried out through the following steps:

[0036] Step 1: Select anaerobic ammonia oxidation sludge as inoculum. Under the condition of disconnection of external circuit, add ammonia nitrogen and nitrite to the influent of the reactor body according to the theoretical ratio of anaerobic ammonia oxidation to promote the formation of anaerobic ammonia oxidation biofilm on the surface of anode carbon fiber brush (2) and cathode carbon fiber brush (3) in the reactor body.

[0037] Step 2: After observing the formation of the anaerobic ammonia oxidation biofilm in the reactor body and the high overall denitrification efficiency of the reactor, no more nitrite is added to the influent. The reaction system is then switched to the electro-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors and operated under constant applied voltage conditions.

[0038] Step 3: After the wastewater passes through the deoxygenation process, it is added to the inlet tank (5), and then enters the main body of the continuous flow electro-anaerobic ammonia oxidation denitrification reactor through the peristaltic pump (8). After the denitrification reaction, it enters the outlet tank (6) through the three-phase separation zone (4) to complete the entire operation process.

[0039] The continuous flow electro-anaerobic ammonia oxidation denitrification reactor, which is the main body of the denitrification system, is based on the internal circulation upflow anaerobic reactor configuration. The internal water circulation route starts from the sampling port at the top of the reaction zone, passes through the circulating peristaltic pump 8, and returns to the water distribution zone at the bottom of the reactor.

[0040] Because anaerobic ammonia oxidizing bacteria grow slowly and are sensitive to adverse factors, an anaerobic ammonia oxidation biofilm was first enriched on the surface of the carbon fiber brushes in the reactor to accelerate the start-up of the continuous electro-anaerobic ammonia oxidation denitrification reactor. Anaerobic ammonia oxidation sludge was selected as inoculum, and the anaerobic ammonia oxidation process was started up in a conventional manner with the external circuit disconnected. Nitrite was added to the reactor influent according to the theoretical ratio for anaerobic ammonia oxidation to promote the formation of the anaerobic ammonia oxidation biofilm on the surface of the carbon fiber brushes. After observing the formation of the anaerobic ammonia oxidation biofilm in the reactor and the reactor as a whole exhibiting high denitrification efficiency, nitrite was no longer added to the influent, and the reaction system was switched to an electro-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors, operating under constant applied voltage conditions.

[0041] During the start-up and operation of the continuous flow electro-anaerobic ammonia oxidation denitrification system, wastewater, after passing through a deoxygenation process, is added to the influent tank. It then enters the continuous flow electro-anaerobic ammonia oxidation denitrification reactor via a peristaltic pump. After the denitrification reaction, the wastewater passes through a three-phase separation zone and enters the effluent tank, completing the entire process. During the operation of the reactor in electro-anaerobic ammonia oxidation denitrification mode, where the electrodes act as electron acceptors, the output voltage of the external DC regulated power supply is set to 0.6V, and a voltage data acquisition card is used to record the voltage across the resistor during operation.

[0042] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, five, or six.

[0043] Specific implementation method eight: Combination Figure 1 and Figure 2 In this embodiment, during the operation of the reactor in the electro-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors, the output voltage of the external DC regulated power supply 7 is set to 0.6V, and a voltage data acquisition card is used to record the voltage across the resistor during operation.

[0044] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, five, six, or seven.

[0045] Example 1:

[0046] The wastewater denitrification system is a continuous flow electro-anaerobic ammonia oxidation denitrification system. The specific operating steps are as follows:

[0047] First, a continuous-flow electro-anaerobic ammonia oxidation denitrification system was constructed. The main reactor of the system is made of plexiglass, and from bottom to top, it consists of a water distribution zone, a reaction zone, and a three-phase separation zone. The total volume of the reactor is 900 ml, of which the conical water distribution zone has a volume of 17 ml, the cylindrical reaction zone has a volume of 402 ml, and the top three-phase separation zone has a volume of 481 ml. The cylindrical reaction zone has an inner diameter of 4 cm and a total height of 32 cm, with a height-to-diameter ratio of 8:1. Two carbon fiber brushes are arranged vertically in the reaction zone as electrodes, connected to an external DC regulated power supply via wires. The carbon fiber brush connected to the positive terminal of the power supply is the anode, and the carbon fiber brush connected to the negative terminal is the cathode. The anode carbon fiber brush is located at the bottom of the reaction zone, and the cathode carbon fiber brush is located at the top of the reaction zone. The distance between the top of the anode carbon fiber brush 2 and the bottom of the cathode carbon fiber brush 3 is 5 cm to avoid short circuits between the anode and cathode carbon fibers. The carbon fiber brush is composed of conductive carbon fiber and titanium wire, with the titanium wire serving as the skeleton and the conductive carbon fiber used for microbial attachment. The carbon fiber brush is 10cm long and 3cm in diameter. The system's inlet and outlet tanks are made of plexiglass, cylindrical in shape, each with a volume of 785ml, and equipped with nitrogen bags for pressure balancing. The system is then connected to a peristaltic pump via piping. The outlet at the bottom of inlet tank 5 is connected to the inlet at the bottom of distribution zone 1, and the reactor's U-shaped outlet pipe is connected to outlet tank 6.

[0048] The continuous electro-anaerobic ammonia oxidation denitrification system uses artificially synthesized wastewater as influent. The artificially synthesized wastewater consists of a nitrogen-rich culture medium and a trace element solution. The nitrogen-rich culture medium contains KHCO3 (1.80 g / L), NaH2PO4 (0.06 g / L), CaCl2 (0.15 g / L), MgSO4 (0.15 g / L), NH4Cl (added as needed), and NaNO2 (added as needed). The trace element solution contains ZnSO4·7H2O (0.43 g / L) and CoCl2·6H2O (0.24 g / L). The following ingredients were added to the nitrogen-rich medium: MnCl₂·4H₂O (0.99 g / L), CuSO₄·5H₂O (0.25 g / L), NiCl₂·6H₂O (0.19 g / L), H₃BO₄ (0.014 g / L), NaSeO₄·10H₂O (0.21 g / L), NaMoO₄·2H₂O (0.22 g / L), NaWO₄·2H₂O (0.05 g / L), FeSO₄ (5 g / L), and EDTA (5 g / L). The prepared nitrogen-rich medium was mixed with the trace element solution at a ratio of 1.5 ml / L, aerated with high-purity nitrogen for 20 min to remove dissolved oxygen from the synthetic wastewater, and then the pH was adjusted to 7.5–8 before being added to the influent tank.

[0049] Finally, the denitrification effect during the start-up and operation of the reaction system was analyzed. The inoculum used during start-up was anaerobic ammonia oxidation sludge granules with a concentration of 9 g / L and an inoculum volume of 30 ml. Initially, the formation of an anaerobic ammonia oxidation biofilm on the carbon fiber brush surface was prioritized. During this process, the influent ammonia nitrogen and nitrite nitrogen concentrations were 140 mg / L and 185 mg / L, respectively, and the external circuit was kept disconnected. After 20 days of reactor operation, the effluent ammonia nitrogen and total nitrogen removal rates were 95% and 88%, respectively, and a red anaerobic ammonia oxidation biofilm was observed on the carbon fiber brush surface. On the 30th day of system operation, the system was switched to an electro-anaerobic ammonia oxidation denitrification mode using electrodes as electron acceptors. The influent ammonia nitrogen and nitrite nitrogen concentrations were 140 mg / L and 0 mg / L, respectively. The external circuit was connected, and the reactor operated under a constant voltage of 0.6V. After changing the operating conditions, the ammonia nitrogen and total nitrogen removal rates quickly reached over 90% and 70%, respectively, and the current in the external circuit increased rapidly. On day 39, the influent ammonia nitrogen concentration was reduced to 70 mg / L, while the ammonia nitrogen removal rate remained above 80%. After 80 days of operation of the continuous electro-anaerobic ammonia oxidation denitrification system, microbial sequencing results showed that the relative abundance of anaerobic ammonia oxidizing bacteria was the highest at 12.7%.

[0050] Example 2:

[0051] Wastewater denitrification is performed using a continuous flow anaerobic ammonia oxidation denitrification system without external voltage. The specific operating steps are as follows:

[0052] First, a control denitrification system was constructed. As a control implementation, except that the circuit outside the main reactor was kept disconnected, everything else was the same as in Specific Implementation 1.

[0053] The formulation of the synthetic wastewater in the reaction system is also consistent with that in Specific Implementation Method 1.

[0054] During the startup and operation of the reaction system, the influent nitrogen concentration of the control denitrification system remained consistent with that in Specific Implementation Method 1. During the initial startup phase, as the anaerobic ammonia oxidation biofilm formed, the presence of nitrite in the influent resulted in the control denitrification system exhibiting the same operational performance as the continuous electro-anaerobic ammonia oxidation denitrification system in Specific Implementation Method 1. After 20 days of operation, an anaerobic ammonia oxidation biofilm successfully formed on the carbon fiber brush surface. After 30 days of operation, the control denitrification system, like the continuous electro-anaerobic ammonia oxidation denitrification system in Specific Implementation Method 1, stopped adding nitrite to the influent, but maintained an open external circuit, continuing operation without an applied voltage. Due to the lack of electron acceptors, the total nitrogen removal rate of the control denitrification system was almost zero. After 80 days of operation, microbial sequencing results showed that the relative abundance of anaerobic ammonia oxidizing bacteria was only 0.03%.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A continuous flow electro-anammox denitrification system comprising a reactor body and a matching device, characterized in that: The reactor body is an internal circulation up-flow anaerobic reactor, the reactor body comprises a water distribution zone (1), a reaction zone, a three-phase separation zone (4), the complete device comprises a water inlet tank (5), a water outlet tank (6), a direct current stabilized power supply (7), a voltage data acquisition system (9), a resistor (10), the water distribution zone (1), the reaction zone and the three-phase separation zone (4) are sequentially arranged from bottom to top, the internal circulation route of the water flow starts from the sampling port at the top of the reaction zone, passes through the circulating peristaltic pump (8), and returns to the water distribution zone (1) at the bottom of the reactor; the reaction zone is in a cylindrical structure, the inner diameter is 4 cm, the height is 32 cm, the height-diameter ratio of the reaction zone is 8:1, the anode carbon fiber brush (2) and the cathode carbon fiber brush (3) are sequentially arranged in the reaction zone from bottom to top, the length of each carbon fiber brush is 10 cm, the diameter is 3 cm, the anode carbon fiber brush (2) is connected with the positive electrode of the direct current stabilized power supply (7); the cathode carbon fiber brush (3) is connected with the negative electrode of the direct current stabilized power supply (7); the anode carbon fiber brush (2) and the cathode carbon fiber brush (3), the resistor (10) and the direct current stabilized power supply are connected in series, the voltage data acquisition system (9) is connected in parallel on the resistor (10), the sampling port at the top of the reaction zone is connected with the water inlet of the water distribution zone (1) through a first connecting pipe; the water inlet tank (5) is connected with the water inlet at the lower part of the reaction zone through a second connecting pipe, and the water outlet of the three-phase separation zone (4) is connected with the water outlet tank (6) through a U-shaped pipe.

2. The continuous flow electric-anammox denitrification system according to claim 1, characterized in that: The anode carbon fiber brush (2) and the cathode carbon fiber brush (3) are kept at a safety distance of more than 3 cm.

3. The continuous flow electric-anammox denitrification system according to claim 2, characterized in that: The anode carbon fiber brush (2) and the cathode carbon fiber brush (3) are both composed of conductive carbon fiber and titanium wire, the titanium wire is used as a framework, and the conductive carbon fiber is used for adhering a microbial membrane.

4. The continuous flow electric-anammox denitrification system according to claim 1, characterized in that: The first connecting pipe and the second connecting pipe are both provided with a peristaltic pump (8).

5. The continuous flow electric-anammox denitrification system according to claim 1, wherein: The water inlet tank (5) and the water outlet tank (6) are made of organic glass, are in a cylindrical structure, and are provided with a nitrogen bag for balancing air pressure.

6. The continuous flow electric-anammox denitrification system according to claim 1, characterized in that: The reactor body is made of organic glass.

7. A method for denitrification in a continuous flow electro-anammox denitrification system according to any one of claims 1-6, characterized in that: The method is performed through the following steps: Step one: anaerobic ammonia oxidation sludge is selected as inoculum, ammonia nitrogen and nitrite are added in the influent of the reactor body according to the theoretical proportion of anaerobic ammonia oxidation under the condition that the external circuit is disconnected, the ammonia nitrogen and nitrite nitrogen concentrations in the influent are 140 mg / L and 185 mg / L respectively, so as to promote the formation of anaerobic ammonia oxidation biofilm on the surface of the anode carbon fiber brush (2) and the cathode carbon fiber brush (3) in the reactor body; Step two: after it is observed that the anaerobic ammonia oxidation biofilm is formed in the reactor body and the reactor has a high denitrification efficiency, the nitrite is no longer added in the influent, the reaction system is converted into an electric-anaerobic ammonia oxidation denitrification mode with electrodes as electron acceptors, the ammonia nitrogen and nitrite nitrogen concentrations in the influent of the system are 140 mg / L and 0 mg / L respectively, and the system is operated under the condition of constant applied voltage; Step three: after the wastewater is subjected to an oxygen removal process, the wastewater is added into the water inlet tank (5), then is introduced into the continuous flow electric-anaerobic ammonia oxidation denitrification reactor body through the peristaltic pump (8), after denitrification reaction, the wastewater is introduced into the water outlet tank (6) through the three-phase separation zone (4), and the whole operation process is completed.

8. The continuous flow electro-anammox denitrification method according to claim 6, characterized in that: In the process of the reactor running in the electric-anoxic ammonia oxidation denitrification mode with electrode as the electron acceptor, the output voltage of the external DC voltage stabilizer (7) is set to 0.6 V, and the voltage data acquisition card is used to record the voltage between the two resistors during the running process.

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