CN117566908A - Denitrification device and method applied to sedimentation tank of anaerobic ammonium oxidation system - Google Patents

Abstract

The invention discloses a denitrification device and a method used in a sedimentation tank of an anaerobic ammonium oxidation system. The device includes: an upper layer anaerobic ammonium oxidation composite biological filler component, a lower layer anaerobic ammonium oxidation composite biological filler component and an effluent interception net; The effluent interception net is installed at the outlet of the vertical flow sedimentation tank; the upper anaerobic ammonium oxidation composite biological filler assembly includes a plurality of upper transverse fixed rods spaced along the horizontal direction and multiple sets of movable composite biological filler ball strings; the lower anaerobic The ammonia oxidation composite biofiller assembly includes a plurality of lower transverse fixed rods spaced apart in the horizontal direction and multiple groups of fixed composite biofiller ball strings; each group of composite biofiller ball strings includes a plurality of filler balls connected in series along the longitudinal direction. The invention can solve the problems of difficulty in controlling ammonia nitrogen in the sedimentation tank of an anaerobic ammonium oxidation system, difficulty in ensuring standard stability, and loss of anaerobic ammonium oxidizing bacteria.

Description

Denitrification device and method applied to sedimentation tank of anaerobic ammonium oxidation system

Technical field

The invention belongs to the technical field of sewage treatment, and more specifically, relates to a denitrification device and method applied to a sedimentation tank of an anaerobic ammonium oxidation system.

Background technique

A beautiful water environment has become an urgent need for people to live a better life. Serious water pollution phenomena such as algae blooms, red tides, and black odors are closely related to excessive nitrogen. Sewage denitrification is the focus and difficulty of water environment construction. Anaerobic ammonium oxidizing bacteria is a type of red archaea that originated more than 3 billion years ago. It has a unique anaerobic ammonium oxidizer that can convert ammonia nitrogen and nitrite nitrogen into nitrogen gas in one step. Compared with traditional denitrification technology, , Red Bacteria denitrification of sewage has significant advantages in saving chemicals, reducing greenhouse gas emissions, saving land space, and saving electricity consumption.

At present, in the actual engineering operation and regulation of a high ammonia nitrogen anaerobic ammonium oxidation system using red bacteria in digestive fluid to denitrify, it is found that the control of effluent ammonia nitrogen in the anaerobic ammonium oxidation tank has become the main factor affecting the system's denitrification efficiency and capacity. The effluent ammonia nitrogen Controlling the concentration too low will cause the terminal dissolved oxygen to rise, thereby inhibiting anaerobic ammonium oxidizing bacteria and causing a large accumulation of NOB, forming a vicious cycle and eventually leading to system collapse. In order to prevent this situation from happening, during system regulation, the ammonia nitrogen concentration in the effluent of the upstream anaerobic ammonium oxidation tank is often controlled to be within a relatively safe range (above 40mg/L). However, this will cause the effluent from the downstream sedimentation tank to still remain There is a high ammonia nitrogen and nitrite content, and the final effluent ammonia nitrogen and total nitrogen are difficult to meet the standards, which affects the removal efficiency and effect of the system. Therefore, the remaining nitrogen needs further processing. In addition, part of the anammox particles and shed biofilm in the anammox tank will enter the sedimentation tank with the effluent from the anammox tank. How to intercept and utilize this part of the anammox bacteria that still have high biological activity? , which is also a problem that needs to be solved for the current promotion and application of anaerobic ammonium oxidation technology.

Contents of the invention

The purpose of the present invention is to propose a denitrification device and method applied to the sedimentation tank of an anaerobic ammonium oxidation system to solve the difficulty of controlling ammonia nitrogen in the effluent of the sedimentation tank of an anaerobic ammonium oxidation system, the difficulty of ensuring standard stability, and the loss of anaerobic ammonium oxidizing bacteria. The problem.

In order to achieve the above object, in the first aspect, the present invention proposes a denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system, including: an upper layer anaerobic ammonium oxidation composite biological filler assembly, and a lower layer anaerobic ammonium oxidation composite biological filler assembly. and effluent interception nets;

The upper anaerobic ammonium oxidation composite biological filler assembly and the lower anaerobic ammonium oxidation composite biological filler assembly are spaced up and down in the vertical flow sedimentation tank, and the water outlet net is installed at the water outlet of the vertical flow sedimentation tank;

The upper layer anaerobic ammonium oxidation composite biofiller assembly includes a plurality of upper transverse fixed rods spaced apart along the horizontal direction, and multiple sets of movable composite biofiller ball strings are spaced on each of the upper transverse fixed rods;

The lower layer anaerobic ammonium oxidation composite biological filler assembly includes a plurality of lower layer transverse fixed rods arranged at intervals along the horizontal direction, and multiple sets of fixed composite biological filler ball strings are arranged at intervals on each of the lower layer transverse fixed rods;

Each set of movable composite biofiller ball strings and each set of fixed composite biofiller ball strings include a plurality of filler balls connected in series along the longitudinal direction.

Optionally, the volume filling ratio of the movable composite biofiller ball string and the fixed composite biofiller ball string relative to the total volume of the vertical flow sedimentation tank is 5%-10%.

Optionally, the top end of the movable composite biofiller ball string is detachably connected to the upper transverse fixed rod;

The top of the fixed composite biofiller ball string is fixedly connected to the lower transverse fixed rod.

Optionally, the distance between the plurality of filler balls on the movable composite biofiller ball string and the fixed composite biofiller ball string is 5 cm.

Optionally, the filler balls are plastic spherical fillers, and the diameter of the filler balls is 100mm-200mm;

A plurality of the filler balls are longitudinally connected in series through connecting members.

Optionally, the pore diameter of the water outlet net is 200 μm.

Optionally, the upper transverse fixing rod and the lower transverse fixing rod are I-beams, and both ends of the I-beam are fixedly connected to the inner wall of the vertical flow sedimentation tank.

In a second aspect, the present invention proposes a denitrification method applied to the sedimentation tank of an anaerobic ammonium oxidation system, using the denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system described in the first aspect, and the method includes:

Control the ammonia nitrogen concentration range of the anaerobic ammonium oxidation reaction tank effluent to 20mg/L-200mg/L, and the nitrite concentration range 10mg/L-80mg/L, so that the effluent of the anaerobic ammonium oxidation reaction tank is suitable for anaerobic ammonium oxidizing bacteria growth;

Control the continuous and stable water output from the anaerobic ammonium oxidation reaction tank. When the effluent mixture from the anaerobic ammonium oxidation reaction tank flows into the vertical flow sedimentation tank, the anaerobic ammonium oxidizing bacteria are enriched in the vertical flow sedimentation tank and attach to the filler balls for self-growth. During the denitrification reaction, when anaerobic ammonium oxidizing bacteria biofilm is gradually formed on the movable composite biofiller ball string and the fixed composite biofiller ball string, the system completes the denitrification start-up stage;

After completing the startup phase, continue to control the nitrite nitrogen concentration range of the anaerobic ammonium oxidation reaction tank effluent to 10mg/L-80mg/L, so that the system enters the normal denitrification operation phase;

The shed biofilm and particles trapped by the effluent interception net are regularly cleaned and added to the anaerobic ammonium oxidation reaction tank.

Optionally, the denitrification method is applied to continuous flow integrated anaerobic ammonia oxidation denitrification of high ammonia nitrogen wastewater or continuous flow two-stage anaerobic ammonia oxidation denitrification of high ammonia nitrogen wastewater;

Wherein, the high ammonia nitrogen wastewater includes wastewater with an ammonia nitrogen concentration higher than 100 mg/L.

The beneficial effects of the present invention are:

The denitrification device of the present invention applied to the sedimentation tank of the anaerobic ammonium oxidation system, by setting up and down double-layer anaerobic ammonium oxidation composite biological filler ball strings in the vertical flow sedimentation tank of the anaerobic ammonium oxidation system, can pass through the pre-sequence anaerobic The effluent from the ammonia oxidation tank provides NH ₄ ⁺ -N and NO ₂ ^- -N as the substrate necessary for the growth of anaerobic ammonium oxidizing bacteria to enrich the anaerobic ammonium oxidizing bacteria. After the enrichment is completed, the effluent from the anaerobic ammonium oxidation tank enters the sedimentation tank. , capable of performing an autotrophic denitrification reaction on the anaerobic ammonium oxidation composite biological filler in the sedimentation tank. This denitrification device can continuously enrich anaerobic ammonium oxidizing bacteria, and at the same time, it can remove the exfoliated bacteria trapped in the effluent of the anaerobic ammonium oxidation tank. The anaerobic ammonium oxidation biofilm and granular sludge adhere to the filler without affecting the sedimentation function of the sedimentation tank. In addition, the interception net (pore size 200μm) matching the outlet of the sedimentation tank can effectively intercept the anaerobic ammonium oxidation composite biological filler. The shed biofilm alleviates the loss of anaerobic ammonium oxidizing bacteria.

Furthermore, by in-situ introducing the denitrification device and method of the present invention applied to the sedimentation tank of the anaerobic ammonium oxidation system, the ammonia nitrogen control range of the effluent of the anaerobic ammonium oxidation process of high ammonia nitrogen sewage is more flexible, the system is optimized, and the denitrification performance is further improved. , reducing the processing pressure in the subsequent treatment section, so that the effluent quality of the anaerobic ammonium oxidation treatment system can reach the "Water Quality Standard for Sewage Discharge into Urban Sewers" (GB/T31962-2015).

The system of the present invention has other features and advantages that will be apparent from or will be apparent from the drawings and the detailed description that follows, which are incorporated herein. The detailed description is set forth in the following description, and the drawings and detailed description together serve to explain certain principles of the invention.

Description of the drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings, in which the same reference numerals generally represent the same components. .

Figure 1 shows a top view of a denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system installed in the sedimentation tank according to Embodiment 1 of the present invention.

Figure 2 shows a cross-sectional view along the I-I direction in Figure 1 of a denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system according to Embodiment 1 of the present invention.

Figure 3 shows a cross-sectional view along the II-II direction in Figure 1 of a denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system according to the present invention.

Detailed ways

The invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Example 1

As shown in Figures 1 to 3, the present invention proposes a denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system, including: an upper anaerobic ammonium oxidation composite biological filler assembly, and a lower anaerobic ammonium oxidation composite biological filler assembly. and effluent interception net 6;

The upper anaerobic ammonium oxidation composite biological filler assembly and the lower anaerobic ammonium oxidation composite biological filler assembly are spaced up and down in the vertical flow sedimentation tank 1, and the water outlet net 6 is installed at the water outlet of the vertical flow sedimentation tank 1 ;

The upper layer anaerobic ammonium oxidation composite biofiller assembly includes a plurality of upper transverse fixed rods 2 arranged at intervals along the horizontal direction. Each of the upper transverse fixed rods 2 is provided with multiple sets of movable composite biofiller ball strings 3 at intervals. ;

The lower anaerobic ammonium oxidation composite biological filler assembly includes a plurality of lower transverse fixed rods 4 arranged at intervals along the horizontal direction, and multiple sets of fixed composite biological filler ball strings 5 are arranged at intervals on each of the lower transverse fixed rods 4;

Each group of movable composite biofiller ball strings 3 and each group of fixed composite biofiller ball strings 5 include a plurality of filler balls connected in series along the longitudinal direction.

Preferably, the top of the movable composite biofiller ball string 3 is detachably connected to the upper transverse fixed rod 2; the top of the fixed composite biofiller ball string 5 is fixedly connected to the lower transverse fixed rod 4. .

Preferably, the volume filling ratio of the movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5 relative to the total volume of the vertical flow sedimentation tank 1 is 5%-10%; The distance between the plurality of filler balls on the mobile composite biological filler ball string 3 and the fixed composite biological filler ball string 5 is 5cm; the filler balls are plastic spherical fillers, and the diameter of the filler balls is 100mm-200mm. The filling balls are longitudinally connected in series through connecting pieces.

Specifically, in this embodiment, the movable composite biofiller ball string 3 is hung on the upper horizontal fixed rod 2 through a steel hook, and can be disassembled and assembled in the vertical flow sedimentation tank 1; the fixed composite The biofiller ball string 5 is fixed and bundled on the lower transverse fixing rod 4 through steel wires. The upper transverse fixing rod 2 and the lower transverse fixing rod 4 are I-beams. The two ends of the I-beam are connected to the vertical flow. The inner wall of sedimentation tank 1 is fixedly connected. In the movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5, the distance between the filler balls in each group of filler ball strings is 5cm, which can be adjusted by adjusting the number of filler balls in each group of filler ball strings and the hanging The number of strings of packing ball strings on the upper and lower layers is laterally fixed on the rod 4, and the volume filling ratio of the packing ball strings relative to the total volume of the vertical flow sedimentation tank 1 is controlled to be 5%-10%. The movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5 are respectively composed of plastic spherical fillers with a diameter of 100-200 mm, and are connected in series longitudinally through stainless steel bars. The outlet water interception net 6 is installed at the water outlet of the vertical flow sedimentation tank 1, with a hole diameter of 200 μm.

Example 2

This embodiment proposes a denitrification method applied to the sedimentation tank of an anaerobic ammonium oxidation system, using the denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system described in Example 1. The method includes:

Control the ammonia nitrogen concentration and nitrite concentration in the effluent of the anaerobic ammonium oxidation reaction tank within the set concentration range, so that the effluent of the anaerobic ammonium oxidation reaction tank is suitable for the growth of anaerobic ammonium oxidizing bacteria;

Control the continuous and stable water output from the anaerobic ammonium oxidation reaction tank. When the effluent mixed liquid from the anaerobic ammonium oxidation reaction tank flows into the vertical flow sedimentation tank 1, the anaerobic ammonium oxidizing bacteria are enriched in the vertical flow sedimentation tank 1 and attach to the filler balls. An autotrophic denitrification reaction is carried out on the system. When an anaerobic ammonium oxidizing bacteria biofilm is gradually formed on the movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5, the system completes the denitrification start-up stage;

After completing the startup phase, continue to control the nitrite nitrogen concentration in the effluent of the anaerobic ammonium oxidation reaction tank within the set concentration range, so that the system enters the normal denitrification operation phase;

The shed biofilm and particles intercepted by the effluent interception net 6 are regularly cleaned and added to the anaerobic ammonium oxidation reaction tank.

Specifically, the method of this embodiment is based on the denitrification device of Example 1 applied to the sedimentation tank of the anaerobic ammonium oxidation system, and the denitrification device of Example 1 applied to the anaerobic ammonium oxidation treatment system is installed in the vertical flow sedimentation tank 1 of the anaerobic ammonium oxidation treatment system. The denitrification device of the sedimentation tank of the ammonia oxidation system is to install the upper anaerobic ammonium oxidation composite biological filler component and the lower anaerobic ammonium oxidation composite biological filler component in the vertical flow sedimentation tank 1 in advance, and install them at the outlet of the vertical flow sedimentation tank 1 Install interception net. The vertical flow sedimentation tank 1 is connected to it through the outlet pipe of the preceding anaerobic ammonium oxidation reaction tank. The activated sludge, exfoliated biofilm and granular sludge entering the vertical flow sedimentation tank 1 coexist with the biofilm attached to the filler balls of the movable composite biological filler ball string 3 and the fixed composite biological filler ball string 5, and interact with each other. depend on each other and do not interfere with each other in spatial distribution.

The denitrification method includes the following two processes:

(1) Anaerobic ammonium oxidation biofilm enrichment growth period: control the ammonia nitrogen concentration ρ (NH ₄ ⁺ -N) and nitrite nitrogen concentration ρ (NO ₂ ^- -N) in the effluent of the anaerobic ammonium oxidation tank before setting The concentration range of the ammonia nitrogen concentration ρ (NH ₄ ⁺ -N) is preferably 20mg/L-200mg/L, and the nitrite nitrogen concentration ρ (NO ₂ ^- -N) is preferably 10mg/L-80mg/L, and Ensure continuous and stable water output from the anaerobic ammonium oxidation tank; when the effluent mixture from the anaerobic ammonium oxidation tank flows into the sedimentation tank, the anaerobic ammonium oxidizing bacteria in the floc sludge will be enriched using ammonia nitrogen and nitrite as the substrate, and The anaerobic ammonium oxidation granular sludge and biofilm entering the sedimentation tank can also be intercepted by the filler and further attached and grown. After a period of cultivation, brick-red anaerobic ammonium oxidizing bacteria biofilm will be clearly attached to the surface of the filler in the sedimentation tank;

(2) Stable operation stage of the denitrification device: After the above steps, the anaerobic ammonium oxidation biofilm is formed on the movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5 in the vertical flow sedimentation tank 1, and the device is started. After the stage is over, the nitrite nitrogen concentration in the effluent of the preceding anaerobic ammonium oxidation tank will continue to be controlled to be 10 mg/L ≤ ρ (NO ₂ ^- -N) ≤ 80 mg/L, and the entire denitrification device can enter the normal operation stage. Thereafter, the operating personnel only need to regularly clean up the shed biofilm and particles trapped by the effluent interception net 6, and add them to the upstream anaerobic ammonium oxidation tank.

The denitrification method of this embodiment can be applied to continuous flow integrated anaerobic ammonium oxidation denitrification of high ammonia nitrogen wastewater or continuous flow two-stage anaerobic ammonium oxidation denitrification of high ammonia nitrogen wastewater. Among them, the high ammonia nitrogen wastewater includes wastewater with ammonia nitrogen concentration higher than 100 mg/L, such as sludge digestion liquid, aquaculture wastewater and landfill leachate.

The present invention will be further described below through an application example.

The anaerobic ammonia oxidation of the sludge thermal hydrolysis digestion liquid from Beijing Xiaohongmen Reclaimed Water Plant was used to produce high ammonia nitrogen wastewater. The water quality is shown in Table 1.

Table 1 High ammonia nitrogen wastewater quality

Note: The above index units are mg/L

After the high ammonia nitrogen wastewater is treated by the pre-process of the anaerobic ammonium oxidation project of the sludge thermal hydrolysis digestion liquid in Xiaohongmen Reclaimed Water Plant, the effluent from the anaerobic ammonium oxidation tank flows into the sedimentation tank of the anaerobic ammonium oxidation system through gravity flow. The water quality is as shown in Table 2. Show.

Table 2 Quality of wastewater entering the sedimentation tank of the anaerobic ammonium oxidation system

Note: The above indicator units are mg/L;

According to the above denitrification method of the present invention, sewage is denitrified, specifically as follows:

S1: Control the ammonia nitrogen concentration in the effluent of the anaerobic ammonium oxidation tank (30.6mg/L≤ρ(NH ₄ ⁺ -N)≤172mg/L), and the nitrite nitrogen concentration (10.3mg/L≤ρ(NO ₂ ^- - N)≤45.8mg/L), this project can continuously ensure stable water output from the anaerobic ammonium oxidation tank. The denitrification device of the present invention applied to the sedimentation tank of an anaerobic ammonium oxidation system is installed in the vertical flow sedimentation tank 1, in which the movable composite biological filler ball string 3 and the fixed composite biological filler ball string 5 are compared with the vertical flow sedimentation tank 1. The volume filling ratio of the effective volume of the flow sedimentation tank 1 is 7%. An interception net (pore diameter 200 μm) is installed at the outlet of the vertical flow sedimentation tank 1. When the effluent mixed liquid flows into the sedimentation tank, the anaerobic ammonium oxidation in the floc sludge will The bacteria used ammonia nitrogen and nitrite nitrogen in the mixed solution as a substrate to be enriched, and attached and grew to the hanging blank biological filler ball strings. After about 2 months of culture, obvious brick-red anthracite was attached to the surface of the filler in the sedimentation tank. Ammonia-oxidizing bacteria biofilm;

S2: After the above steps, the anaerobic ammonium oxidation biofilm is formed on the movable composite biofiller ball string 3 and the fixed composite biofiller ball string 5 in the sedimentation tank. The startup phase of the device ends and the pre-sequence anaerobic ammonium oxidation control continues. The nitrite nitrogen concentration of the pool effluent is (15.5mg/L≤ρ(NO ₂ ^- -N)≤42.4mg/L), and the entire device enters the normal operation stage. Thereafter, the operating personnel clean up the shed biofilm and particles intercepted by the effluent interception net 6 every week, and add them to the pre-stage anaerobic ammonium oxidation tank.

The test results show that when the denitrification device used in the sedimentation tank of the anaerobic ammonium oxidation system operates stably, the average effluent ammonia nitrogen concentration (NH ₄ ⁺ -N) of the sedimentation tank is 54.3 mg/L, and the average effluent nitrite nitrogen (NO ₂ --N) concentration is 26.6mg/L, the average effluent total nitrogen (TN) concentration is 107.9mg/L, and the effluent TN concentration is reduced by 10.5%.

In summary, the present invention inoculates the anaerobic ammonium oxidation composite biological filler in the vertical flow sedimentation tank of the anaerobic ammonium oxidation system, and provides NH ₄ ⁺ -N and NO ₂ ^- -N as the effluent of the preceding anaerobic ammonium oxidation tank. The matrix necessary for the growth of anaerobic ammonium oxidizing bacteria is enriched with anaerobic ammonium oxidizing bacteria. After the enrichment is completed, the effluent from the anammox tank enters the sedimentation tank, and an autotrophic denitrification reaction is performed on the anammox composite biological filler. The upper and lower layers of filler ball strings can continuously enrich anaerobic ammonium oxidizing bacteria, and at the same time, the shed anaerobic ammonium oxidation biofilm and granular sludge trapped in the effluent of the anaerobic ammonium oxidation tank can adhere to the filler without affecting the The sedimentation function of the sedimentation tank. In addition, the interception net matching the outlet of the sedimentation tank can effectively intercept the biofilm that falls off the anaerobic ammonium oxidation composite biological filler and alleviate the loss of anaerobic ammonium oxidizing bacteria. By in-situ introducing the denitrification device and method used in the sedimentation tank of the anaerobic ammonium oxidation system, the ammonia nitrogen control range of the effluent of the anaerobic ammonium oxidation process of high ammonia nitrogen sewage is more flexible, the system is optimized, the denitrification performance is further improved, and the subsequent treatment section is reduced Process pressure to help the effluent water quality meet the "Water Quality Standard for Sewage Discharge into Urban Sewers" (GB/T31962-2015).

The advantages of the solution of the present invention include:

(1) In the vertical flow sedimentation tank, the ammonia nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonium oxidation tank are used to cultivate anaerobic ammonium oxidizing bacteria for deep denitrification, which increases the removal load and further reduces the effluent ammonia nitrogen and total nitrogen;

(2) Intercept the effluent bacteria of the anaerobic ammonium oxidation tank to reduce loss;

(3) Prevent the occurrence of over-aeration by controlling the ammonia nitrogen in the effluent of the anaerobic ammonium oxidation tank to meet emission standards, thereby inhibiting the activity of anaerobic ammonium oxidizing bacteria;

(4) Deep nitrogen removal technology and devices in the sedimentation tank without additional floor space, low energy consumption operation, easy management and maintenance.

The embodiments of the present invention have been described above. The above description is illustrative, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims (9)

1. A denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system, which is characterized in that it includes: an upper layer anaerobic ammonium oxidation composite biological filler component, a lower layer anaerobic ammonium oxidation composite biological filler component and an effluent interception net; The upper anaerobic ammonium oxidation composite biological filler assembly and the lower anaerobic ammonium oxidation composite biological filler assembly are spaced up and down in the vertical flow sedimentation tank, and the water outlet net is installed at the water outlet of the vertical flow sedimentation tank; The upper layer anaerobic ammonium oxidation composite biofiller assembly includes a plurality of upper transverse fixed rods spaced apart along the horizontal direction, and multiple sets of movable composite biofiller ball strings are spaced on each of the upper transverse fixed rods; The lower layer anaerobic ammonium oxidation composite biological filler assembly includes a plurality of lower layer transverse fixed rods arranged at intervals along the horizontal direction, and multiple sets of fixed composite biological filler ball strings are arranged at intervals on each of the lower layer transverse fixed rods; Each set of movable composite biofiller ball strings and each set of fixed composite biofiller ball strings include a plurality of filler balls connected in series along the longitudinal direction. 2. The denitrification device used in the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that the movable composite biological filler ball string and the fixed composite biological filler ball string are relative to the The volume filling ratio of the total volume of the vertical flow sedimentation tank is 5%-10%. 3. The denitrification device used in the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that the top end of the movable composite biofiller ball string is detachably connected to the upper transverse fixed rod; The top of the fixed composite biofiller ball string is fixedly connected to the lower transverse fixed rod. 4. The denitrification device used in the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that, the movable composite biological filler ball string and the fixed composite biological filler ball string have multiple The distance between the filling balls is 5cm. 5. The denitrification device used in the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that the filler balls are plastic spherical fillers, and the diameter of the filler balls is 100mm-200mm; A plurality of the filler balls are longitudinally connected in series through connecting members. 6. The denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that the pore size of the water outlet net is 200 μm. 7. The denitrification device used in the sedimentation tank of an anaerobic ammonium oxidation system according to claim 1, characterized in that the upper transverse fixed rod and the lower transverse fixed rod are I-beams, and the I-beam Both ends are fixedly connected to the inner wall of the vertical flow sedimentation tank. 8. A denitrification method applied to the sedimentation tank of an anaerobic ammonium oxidation system, utilizing the denitrification device applied to the sedimentation tank of an anaerobic ammonium oxidation system according to any one of claims 1 to 7, characterized in that, Methods include: Control the ammonia nitrogen concentration range of the anaerobic ammonium oxidation reaction tank effluent to 20mg/L-200mg/L, and the nitrite concentration range 10mg/L-80mg/L, so that the effluent of the anaerobic ammonium oxidation reaction tank is suitable for anaerobic ammonium oxidizing bacteria growth; Control the continuous and stable water output from the anaerobic ammonium oxidation reaction tank. When the effluent mixture from the anaerobic ammonium oxidation reaction tank flows into the vertical flow sedimentation tank, the anaerobic ammonium oxidizing bacteria are enriched in the vertical flow sedimentation tank and attach to the filler balls for self-growth. The system completes the start-up phase when the anaerobic ammonium oxidizing bacteria biofilm is gradually formed on the movable composite biofiller ball string and the fixed composite biofiller ball string through the nitrogen removal reaction; After completing the startup phase, continue to control the nitrite nitrogen concentration range of the anaerobic ammonium oxidation reaction tank effluent to 10mg/L-80mg/L, so that the system enters the normal operation phase; The shed biofilm and particles trapped by the effluent interception net are regularly cleaned and added to the anaerobic ammonium oxidation reaction tank. 9. The denitrification method applied to the sedimentation tank of an anaerobic ammonium oxidation system according to claim 8, characterized in that the denitrification method is applied to continuous flow integrated high ammonia nitrogen wastewater anaerobic ammonium oxidation denitrification or continuous flow Two-stage anaerobic ammonium oxidation denitrification of high ammonia nitrogen wastewater; Wherein, the high ammonia nitrogen wastewater includes wastewater with an ammonia nitrogen concentration higher than 100 mg/L.