CN108117159B

CN108117159B - Treatment method of nitrogen-containing sewage

Info

Publication number: CN108117159B
Application number: CN201611073732.9A
Authority: CN
Inventors: 赵胜楠; 高会杰; 孙丹凤; 郭志华; 陈明翔
Original assignee: China Petroleum and Chemical Corp; Sinopec Fushun Research Institute of Petroleum and Petrochemicals
Current assignee: China Petroleum and Chemical Corp; Sinopec Fushun Research Institute of Petroleum and Petrochemicals
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2020-09-11
Anticipated expiration: 2036-11-29
Also published as: CN108117159A

Abstract

The invention relates to a method for treating nitrogen-containing sewage, which is realized by adopting a denitrification reactor capable of inhibiting thalli or sludge from floating upwards, wherein the sludge and the nitrogen-containing sewage are firstly introduced during sewage treatment, and meanwhile, a water distribution device and an air distribution device arranged in the reactor are started to ensure that air and water are ejected out along a nozzle through a cylindrical channel together, so that a water body is rotated and mixed; adjusting the pressure of the water distribution equipment to ensure that the water body is ejected in a ray form, and adjusting the flow of the air distribution equipment to ensure that the concentration of the dissolved oxygen is 1-5 mg/L; after the operation for a certain time, closing the gas distribution equipment, and carrying out anoxic or anaerobic reaction; after operating for a certain time, the operation is converted into aerobic reaction, and the operation is performed alternately in sequence. By adopting the denitrification reactor with a specific structure and a control mode, the invention can effectively inhibit the floating of the thalli or sludge and exert the denitrification performance of the thalli or sludge to the maximum extent while ensuring the effective back mixing of the water body in the reactor, and has the advantages of simple operation, high denitrification efficiency and the like.

Description

Treatment method of nitrogen-containing sewage

Technical Field

The invention belongs to the technical field of biological sewage treatment, and particularly relates to a treatment method of nitrogen-containing sewage.

Background

The biological sewage treating process is one widely used sewage treating process, and includes AO process, A/A/O process, SBR process, biological filtering bed, etc. all of the biological sewage treating processes are independent of microbes, and the metabolism and activity of microbes are the key factors to determine the treating effect. In the actual sewage treatment process, the higher metabolism capability and better activity of microorganisms are ensured by controlling parameters such as pH, temperature and dissolved oxygen and the like and controlling structures such as stirring, fixing and the like. In the current process research process, researchers carry out detailed research on optimization of parameters such as pH, temperature and dissolved oxygen, but the structure control of the reactor has some problems, the phenomenon of sludge floating cannot be avoided no matter in a reactor for dispersing and mixing solid and liquid such as an activated sludge method and the like or a reactor for fixing microorganisms such as a biofilm method and the like, once the sludge floats upwards and is separated from sewage, the metabolism capability and activity of the sludge are inevitably reduced, so that the concentration of the sludge which plays a role in the reactor is reduced, the structure of bacterial colonies is also changed, and the treatment capability of the reactor is further reduced.

CN201310375066.4 discloses an anaerobic-anoxic-aerobic biochemical reactor with adjustable lattices, which is in a gallery type and comprises 24 separation tanks, wherein clamping grooves are arranged among the separation tanks, partition plates are inserted into the clamping grooves to realize the segmentation of an anaerobic section, an anoxic section and an aerobic section, and water passing orifices are arranged at the lower parts of the clamping grooves. The device adjusts the volume of reaction tank through the quantity of adjusting the partition pond, and the partition pond number is more, and activated sludge very easily bonds at the pool wall, and tiny mud come-up is carried easily to the bubble that anaerobic section and oxygen deficiency section produced, can influence the reaction efficiency of reactor.

CN201510831107.5 discloses a method for relieving the floating of anaerobic ammonium oxidation granular sludge. The anaerobic ammonia oxidation sludge is washed by phosphate buffer solution, then the sludge is placed in mixed liquor containing bicarbonate (or carbonate), phosphate (or hydrogen phosphate) and soluble calcium salt, low-speed uniform stirring is carried out to ensure that calcium precipitates are attached to granular sludge, then the granular sludge is put into an anaerobic ammonia oxidation reactor, the concentration of bicarbonate (or carbonate) and the concentration of phosphate (or hydrogen phosphate) in inlet water of the reactor are gradually increased, and meanwhile, the soluble calcium salt solution is fed from the top of a reaction area. Through the long-term operation process of the reactor, calcium salt precipitates produced by reaction are attached to the surface of the anaerobic ammonia oxidation granular sludge so as to increase the density of the sludge floating on the top of the reaction area, improve the settling property of the anaerobic ammonia oxidation granular sludge, and relieve the sludge floating and running off along with the effluent, thereby improving the anaerobic ammonia oxidation biomass in the reactor and finally improving the anaerobic ammonia oxidation performance of the reactor. The invention mainly introduces a precipitation substance into the reactor, so that the precipitation substance is easy to precipitate in the reactor and is easy to block the pore channel in the reactor after long-term operation.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for treating nitrogen-containing sewage. By adopting the denitrification reactor with a specific structure and a control mode, the invention can effectively inhibit the floating of the thalli or sludge and exert the denitrification performance of the thalli or sludge to the maximum extent while ensuring the effective back mixing of the water body in the reactor, and has the advantages of simple operation, high denitrification efficiency and the like.

The nitrogen-containing sewage treatment method is realized by adopting a denitrification reactor with the following structure, 4 or more than 4 cylindrical channels which are longitudinally distributed are uniformly arranged on the inner wall of the reactor, a plurality of nozzles are arranged on each cylindrical channel, each nozzle is obliquely and downwards arranged along the horizontal direction and has a certain included angle with the cylindrical channel, and the included angle between the longitudinal central line of each nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor is less than 45 degrees; when in sewage treatment, firstly, sludge and nitrogen-containing sewage are accessed, and simultaneously, water distribution equipment and gas distribution equipment arranged in the reactor are started to ensure that gas and water are ejected out along a nozzle through a cylindrical channel together, so that a water body is rotated and mixed; adjusting the pressure of the water distribution equipment to ensure that the water body is ejected in a ray form, and adjusting the flow of the air distribution equipment to ensure that the concentration of dissolved oxygen is 1-5mg/L, wherein the aerobic reaction is mainly carried out in the stage; after the operation for a certain time, closing the gas distribution equipment, and carrying out anoxic or anaerobic reaction; after operating for a certain time, starting the gas distribution equipment, converting into aerobic reaction, and sequentially and alternately operating.

In the present invention, the reactor is a reactor or a reaction tank of various shapes conventionally used in the art, such as a cylinder, a cube, a cuboid, etc. If the reactor is in a cylinder shape or the like, 4 or more than 4 cylindrical channels which are longitudinally distributed can be uniformly arranged on the inner wall of the reactor; if the shape is a cube, a cuboid, or the like, 1 or more longitudinally distributed cylindrical channels may be provided on each side.

In the invention, the cylindrical channels are arranged along the inner wall of the reactor, the specific number of the cylindrical channels is determined according to the actual situation, and the number of the cylindrical channels is not less than 4, preferably 4-10, in order to ensure the vortex back-mixing effect of the water body in the reactor. The cross-section of the cylindrical passage may be cylindrical, oval, square, rectangular, triangular, etc., preferably cylindrical, with a cross-sectional diameter or longest side length of 4-6 cm. The bottom of the cylindrical channel is provided with a connecting port for connecting the air entraining equipment and the water diversion equipment, and the top end of the channel is sealed and higher than the highest liquid level of the reactor. Preferably, the bottom of the longitudinal channel is 5-10cm from the bottom of the reactor and the top is 10-30cm above the highest liquid level in the reactor. The longitudinal channel is higher than the highest liquid level of the reactor, water flow ejected by nozzles obliquely arranged downwards above the liquid level can be utilized, and the floating thalli or sludge can be flushed into the water body by utilizing horizontal and vertical shearing forces under the condition that the water body rotates, so that the floating thalli or sludge in the reaction can be effectively inhibited.

In the invention, each cylindrical channel is provided with a plurality of nozzles for jetting gas, liquid or gas-liquid mixture in a jet flow mode, the nozzles are conical, the diameter of the section of the joint (inlet end) of the nozzles and the cylindrical channel is 2-4cm, and the diameter of the section of the outlet end (nozzle opening) is 1-2 cm. The conical nozzles on each cylindrical channel are positioned on the same vertical line, and the vertical distance is 5-10 cm; and the nozzle is obliquely arranged downwards along the horizontal direction, the included angle between the longitudinal central line (the connecting line of the circle center of the cross section of the inlet end of the nozzle and the circle center of the cross section of the outlet end) and the perpendicular line of the cross section of the cylindrical channel is 30-60 degrees, and the horizontal projection length is 2-5 cm. If the reactor is a cylinder, the included angle between the longitudinal central line of the nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor is 30-45 degrees; if the reactor is square, the angle between the longitudinal centre line of the nozzle and the side length of the reactor is 30-45 deg.

In the invention, the sludge is denitrified activated sludge which is conventionally used in the field, and the inoculation amount is SV of a system after the sludge is inoculated₃₀(sludge settling ratio) is 20-30%. The nitrogen-containing sewage is various industrial sewage containing ammonia nitrogen and COD, the ammonia nitrogen concentration is 500mg/L, the total nitrogen concentration is 200mg/L, the total nitrogen concentration is 800mg/L, the COD is less than 500mg/L, and the adding amount of the sewage is 0.5-0.8 times of the volume of the reactor.

In the present invention, the flow rate of the gas is adjusted to control the concentration of dissolved oxygen in the reactor to 1 to 5mg/L, preferably 1 to 3 mg/L. Due to the adoption of the denitrification reactor, gas is impacted and cut into extremely fine bubbles by high-speed fluid, so that the oxygen utilization rate can be effectively improved.

In the invention, after the aerobic reaction is operated for 4-12h, the gas distribution equipment is closed, the anoxic or anaerobic reaction is carried out, the operation is carried out for 4-12h, the ammonia nitrogen concentration of the effluent is measured every 1-3 times of alternate operation, and if the ammonia nitrogen does not reach the standard, the alternate operation is continued; if the ammonia nitrogen reaches the standard and the total nitrogen does not reach the standard, only the anaerobic reaction is carried out, the direct total nitrogen reaches the standard, and the effluent meets the discharge requirement.

In the invention, the pH value in the treatment process is controlled to be 7-9, and the treatment temperature is controlled to be 25-35 ℃.

Compared with the prior art, the invention has the following advantages:

(1) the denitrification reactor is provided with the cylindrical channel and the nozzles with specific structures and connection relations, and gas, liquid or gas-liquid mixture is ejected out of each nozzle after passing through the cylindrical channel, so that the scouring effect of horizontal shearing force on the inner wall of the reactor is enhanced, and the adhesion of thalli or sludge on the inner wall of the reactor is effectively prevented; meanwhile, as the nozzles are arranged obliquely downwards, longitudinal mixing is increased on the basis of horizontal rotation of the water body, and the integral back mixing effect of the water body is enhanced; and the floating thalli or sludge in the reaction process can be flushed into the rotating water body at any time, the thalli or sludge particles cannot be stirred or cut, the floating of the thalli or sludge is inhibited, and the efficiency of sewage treatment is improved.

(2) By adopting the denitrification reactor with a specific structure and a control mode, the floating of thalli or sludge is effectively inhibited while the effective back mixing of the water body in the reactor is ensured, the denitrification performance of the thalli or the sludge is exerted to the maximum extent, and the denitrification reactor has the advantages of simple operation, high denitrification efficiency and the like.

(3) The reactor can realize the rotary mixing under various environments such as anaerobic environment, anoxic environment or aerobic environment by spraying liquid, gas or gas-liquid mixture on the premise of not introducing other substances, thereby improving the operation flexibility of the reactor and having wider application range.

Drawings

FIG. 1 is a plan view of a denitrification reactor used in the present invention (a cylindrical reactor is taken as an example);

wherein: 1-reactor, 2-cylindrical channel, 3-nozzle; the included angle between the longitudinal center line of the alpha-nozzle and the perpendicular line of the cross section of the cylindrical channel and the included angle between the longitudinal center line of the beta-nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor;

FIG. 2 is a longitudinal sectional view taken along line A-A of a reactor according to the present invention;

wherein: 4-reactor head cover;

FIG. 3 is an enlarged view of portion B of FIG. 2;

wherein: 3-1-nozzle inlet end, 3-2-nozzle outlet end.

Detailed Description

The denitrification method of the present invention will be described in detail with reference to the accompanying drawings and examples.

The denitrification reactor is structurally shown in figures 1, 2 and 3, the appearance of the reactor 1 is a cylinder, 4 or more than 4 cylindrical channels 2 which are longitudinally distributed are uniformly arranged on the inner wall of the reactor, a plurality of nozzles 3 are arranged on each cylindrical channel 2, each nozzle is obliquely and downwards arranged along the horizontal direction, the included angle between the longitudinal center line of each nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor is alpha, and the included angle between the longitudinal center line of each nozzle and the perpendicular line of the cross section of the cylindrical channel is beta. When the reactor is operated, gas, liquid or a gas-liquid mixture ejected by the nozzle can form rotary mixing in the reactor, so that the aims of scouring the inner wall of the reactor and inhibiting thalli or sludge in the reactor from floating upwards are fulfilled. When the reactor is subjected to anoxic or anaerobic reaction, the reactor top cover 4 is covered to isolate air.

The diameter of the cross section of a denitrification reactor adopted in the embodiment of the invention is 50cm, the height of the reactor is 100cm, the highest liquid level in the reactor is 70cm, 4 longitudinal cylindrical channels with the diameter of the cross section of 4cm are uniformly arranged in the reactor, the bottom end of each longitudinal channel is 10cm away from the bottom of the reactor, and the top of each longitudinal channel is 10cm higher than the highest liquid level. The diameter of the cross section of the inlet end of each nozzle is 2cm, the diameter of the cross section of the outlet end of each nozzle is 1cm, the length of the horizontal projection is 2cm, the vertical distance of each nozzle is 5cm, alpha is 45 degrees, and beta is 45 degrees. The bottom of the cylindrical channel is connected with a submersible pump and an underwater aerator.

When in sewage treatment, firstly, sludge and nitrogen-containing sewage are accessed, and simultaneously, water distribution equipment and gas distribution equipment arranged in the reactor are started to ensure that gas and water are ejected out along a nozzle through a cylindrical channel together, so that a water body is rotated and mixed; adjusting the pressure of the water distribution equipment to ensure that the water body is ejected in a ray form, adjusting the flow rate of the air distribution equipment, and controlling the concentration of dissolved oxygen in the reactor to be 1-5mg/L, wherein the aerobic reaction is mainly carried out in the stage; after the operation for a certain time, the gas distribution equipment is closed, and the anoxic or anaerobic reaction is mainly carried out in the reactor; after operating for a certain time, starting the gas distribution equipment to perform aerobic reaction, and sequentially and alternately operating.

The invention adopts GB7478-87 'determination of water quality-ammonium-distillation and titration' method to determine the concentration of ammonia nitrogen; 11894-89, namely determining total nitrogen by using an alkaline potassium persulfate digestion ultraviolet spectrophotometry (determination of water quality-total nitrogen); measuring COD by GB11914-89 bichromate method for measuring water quality and chemical oxygen demand; sludge concentration SV by adopting sludge sedimentation method₃₀。

Example 1

The sewage to be treated is nitrogen-containing sewage of a certain sewage treatment plant, the ammonia nitrogen concentration is 150mg/L, the total nitrogen is 200mg/L, and the COD concentration is 300 mg/L. The pH value in the treatment process is controlled to be 7.5-8.5, and the treatment temperature is controlled to be 30-35 ℃.

The denitrification reactor is adopted, firstly, denitrification sludge and nitrogen-containing sewage are inoculated, and the inoculation amount is the SV of a system after the sludge is inoculated₃₀The adding amount of sewage is 20 percent, the adding amount of sewage is 0.7 times of the volume of the reactor, a submersible pump and an underwater aerator which are arranged in the reactor are simultaneously started, air and water are simultaneously jetted out along a nozzle through a cylindrical channel, water is enabled to be mixed in a rotating mode, the pressure of the pump is adjusted, the water is guaranteed to be jetted out in a ray mode, the flow of the aerator is adjusted simultaneously, the concentration of dissolved oxygen in the reactor is controlled to be 2-2.5mg/L, the aerator is closed after the reactor is operated for 4 hours, the anaerobic reaction is gradually changed into the anoxic reaction or the anaerobic reaction, the aerator is started after the reactor is operated for 4 hours, the.

And sampling and detecting the water quality of the effluent every time the effluent alternately runs once, wherein the ammonia nitrogen concentration is 110mg/L after 8 hours, the ammonia nitrogen concentration is 60mg/L after 16 hours, the ammonia nitrogen is less than 5mg/L after 24 hours, the total nitrogen is less than 25mg/L, and the two indexes meet the discharge requirement. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from a water outlet, wherein SS (suspended solid) of the sewage is less than 10mg/L, and the inner wall of the reactor is basically free of sludge adhesion.

Example 2

The sewage to be treated is nitrogen-containing sewage of a certain sewage treatment plant, the ammonia nitrogen concentration is 300mg/L, the total nitrogen concentration is 450mg/L, and the COD concentration is 200 mg/L. The pH value is controlled to be 7.5-8.5 in the treatment process, and the treatment temperature is controlled to be 25-30 ℃.

The denitrification reactor is adopted, firstly, denitrification sludge and nitrogen-containing sewage are inoculated, and the inoculation amount is the SV of a system after the sludge is inoculated₃₀25 percent, the adding amount of sewage is 0.7 times of the volume of the reactor, a submersible pump and an underwater aerator which are arranged in the reactor are simultaneously started, air and water are simultaneously jetted out along a nozzle through a cylindrical channel, water is rotationally mixed, the pressure of the pump is regulated, the water is ensured to be jetted out in a ray form, the flow of the aerator is simultaneously regulated, the concentration of dissolved oxygen in the reactor is controlled to be 1.5-2.0mg/L, after the reactor is operated for 6 hours, the aerator is closed and gradually becomes anoxic or anaerobic reaction, and after the reactor is operated for 6 hours, the aerator is started to perform aerobic reaction and sequentially and alternately operated.

And sampling and detecting the water quality of the outlet water every time of alternate operation, wherein the ammonia nitrogen concentration is 230mg/L after 12 hours, 180mg/L after 24 hours, 120mg/L after 36 hours, 70mg/L after 48 hours, 30mg/L after 60 hours, 5mg/L after 72 hours, and 25mg/L of total nitrogen, and the two indexes meet the discharge requirement. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from a water outlet, wherein SS (suspended solid) of the sewage is less than 10mg/L, and the inner wall of the reactor is basically free of sludge adhesion.

Example 3

The sewage to be treated is nitrogen-containing sewage of a certain sewage treatment plant, the ammonia nitrogen concentration is 450mg/L, the total nitrogen concentration is 600mg/L, and the COD concentration is 100 mg/L. The pH value in the treatment process is controlled to be 7.5-8.5, and the treatment temperature is controlled to be 30-35 ℃.

The denitrification reactor is adopted, firstly, denitrification sludge and nitrogen-containing sewage are inoculated, and the inoculation amount is the SV of a system after the sludge is inoculated₃₀30 percent of sewage, the adding amount of the sewage is 0.7 times of the volume of the reactor, a submersible pump and an underwater aerator which are arranged in the reactor are simultaneously started to ensure that air and water are ejected out along a nozzle through a cylindrical channel together, the water body is rotated and mixed, the pressure of the pump is adjusted to ensure that the water body is ejected in a ray form, the flow rate of the aerator is adjusted at the same time, and the reverse flow is controlledThe concentration of dissolved oxygen in the reactor is 1.5-2.0mg/L, after running for 4 hours, the aerator is closed, the anaerobic reaction or anoxic reaction is gradually changed, after running for 4 hours, the aerator is opened, the aerobic reaction is carried out, and the reactor alternately runs in sequence.

And sampling and detecting the water quality of the water every two times of alternate operation, wherein the ammonia nitrogen concentration is 380mg/L after 16h, the ammonia nitrogen concentration is 280mg/L after 32h, the ammonia nitrogen is 200mg/L after 48h, the ammonia nitrogen is 130mg/L after 64h, the ammonia nitrogen is 60mg/L after 80h, the ammonia nitrogen is less than 5mg/L after 96h, the total nitrogen is less than 40mg/L, the ammonia nitrogen reaches the standard, the total nitrogen does not reach the standard, the anaerobic treatment is repeated for 4h, and then the ammonia nitrogen concentration of the detected water is less than 25 mg/L. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from a water outlet, wherein SS (suspended solid) of the sewage is less than 10mg/L, and the inner wall of the reactor is basically free of sludge adhesion.

Comparative example 1

The treatment process and operating conditions were the same as in example 2. The difference lies in that: the conventional direct aeration and intermediate mechanical stirring modes are adopted. And sampling and detecting the water quality of the outlet water every time of alternate operation, wherein the ammonia nitrogen concentration is 230mg/L after 12 hours, 190mg/L after 24 hours, 130mg/L after 36 hours, 80mg/L after 48 hours, 40mg/L after 60 hours, 15mg/L after 72 hours, 5mg/L after 84 hours and 25mg/L of total nitrogen, and the two indexes meet the discharge requirement. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from the water outlet, wherein SS (suspended solid) of the sewage is more than 10mg/L, and the inner wall of the reactor is obviously bonded with sludge.

Comparative example 2

The treatment process and operating conditions were the same as in example 2. The difference lies in that: the nozzle in the denitrification reactor is consistent with the horizontal direction, namely the included angle alpha between the longitudinal central line of the nozzle and the vertical line of the cylindrical channel is 90 degrees. Sampling and detecting the water quality of the outlet water every time of alternate operation, wherein the ammonia nitrogen concentration is 225mg/L after 12 hours, the ammonia nitrogen concentration is 175mg/L after 24 hours, the ammonia nitrogen is 110mg/L after 36 hours, the ammonia nitrogen is 65mg/L after 48 hours, the ammonia nitrogen is 20mg/L after 60 hours, the ammonia nitrogen is less than 15mg/L after 72 hours, the ammonia nitrogen is less than 5mg/L after 84 hours, the total nitrogen is less than 25mg/L, and the two indexes meet the discharge requirement. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from the water outlet, wherein SS (suspended solid) of the sewage is more than 10mg/L, and the inner wall of the reactor is obviously bonded with sludge.

Comparative example 3

The process conditions and reactor parameters were the same as in example 2, except that: the included angle beta between the longitudinal central line of the nozzle in the denitrification reactor and the tangent line of the joint of the cylindrical channel and the outer wall of the reactor is 60 degrees. And sampling and detecting the water quality of the outlet water every time of alternate operation, wherein the ammonia nitrogen concentration is 250mg/L after 12 hours, 200mg/L after 24 hours, 150mg/L after 36 hours, 90mg/L after 48 hours, 50mg/L after 60 hours, 25mg/L after 72 hours, 5mg/L after 84 hours, and 25mg/L of total nitrogen, and the two indexes meet the discharge requirement. And (3) closing the submersible pump and the underwater aerator, settling for 30min, discharging sewage from the water outlet, wherein SS (suspended solid) of the sewage is more than 10mg/L, and the inner wall of the reactor is obviously bonded with sludge.

Claims

1. A treatment method of nitrogen-containing sewage is characterized in that a denitrification reactor with the following structure is adopted, 4 or more than 4 cylindrical channels which are longitudinally distributed are uniformly arranged on the inner wall of the reactor, a plurality of nozzles are arranged on each cylindrical channel, each nozzle is obliquely and downwards arranged along the horizontal direction and has a certain included angle with the cylindrical channel, and the included angle between the longitudinal central line of each nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor is less than 45 degrees; when in sewage treatment, firstly, sludge and nitrogen-containing sewage are accessed, and simultaneously, a water distribution device and an air distribution device arranged at the bottom of the reactor are started to eject air and water along a nozzle through a cylindrical channel, so that water bodies are mixed in a rotating manner; adjusting the pressure of the water distribution equipment to ensure that the water body is ejected in a ray form, and adjusting the flow of the air distribution equipment to ensure that the concentration of the dissolved oxygen is 1-5 mg/L; after the operation for a certain time, closing the gas distribution equipment, and carrying out anoxic or anaerobic reaction; after operating for a certain time, starting the gas distribution equipment, converting into aerobic reaction, and sequentially and alternately operating.

2. The method of claim 1, wherein: the reactor is a cylinder, a cube or a cuboid; if the reactor is in a cylinder shape, 4 or more than 4 longitudinally distributed cylindrical channels are uniformly arranged on the inner wall of the reactor; if the shape is a cube or a cuboid, 1 or more longitudinally distributed cylindrical channels can be arranged on each side.

3. The method of claim 1, wherein: the cylindrical channels are arranged along the inner wall of the reactor, the specific number of the cylindrical channels is determined according to actual conditions, and the number of the cylindrical channels is 4-10 in order to ensure the vortex back-mixing effect of the water body in the reactor.

4. The method of claim 1, wherein: the cross section of the cylindrical passage is circular, oval, square, rectangular or triangular, and the diameter of the cross section or the longest side length of the cylindrical passage is 4-6 cm.

5. The method of claim 1, wherein: the bottom of the cylindrical channel is provided with a connecting port for connecting the air entraining equipment and the water diversion equipment, and the top end of the channel is sealed and higher than the highest liquid level of the reactor.

6. The method of claim 1, wherein: the bottom of the longitudinal channel is 5-10cm away from the bottom of the reactor, and the top of the longitudinal channel is 10-30cm higher than the highest liquid level of the reactor.

7. The method of claim 1, wherein: the nozzle is conical, the diameter of the section of the joint of the nozzle and the cylindrical channel is 2-4cm, and the diameter of the section of the outlet end is 1-2 cm.

8. The method according to claim 1 or 7, characterized in that: the conical nozzles on each cylindrical channel are positioned on the same vertical line, and the vertical distance is 5-10 cm; and the vertical projection is obliquely arranged downwards along the horizontal direction, the included angle between the longitudinal center line and the vertical line of the cross section of the cylindrical channel is 30-60 degrees, and the horizontal projection length is 2-5 cm.

9. The method according to claim 1 or 7, characterized in that: if the reactor is a cylinder, the included angle between the longitudinal central line of the nozzle and the tangent line at the joint of the cylindrical channel and the outer wall of the reactor is 30-45 degrees; if the reactor is square, the angle between the longitudinal centre line of the nozzle and the side length of the reactor is 30-45 deg.

10. The method of claim 1, wherein: the water distribution equipment is a submersible pump, and the gas distribution equipment is a fan or underwater aeration equipment.

11. The method of claim 1, wherein: the quantity of the accessed sludge is SV of the system after the sludge is accessed₃₀20 to 30 percent.

12. The method of claim 1, wherein: the nitrogen-containing sewage is various industrial sewage containing ammonia nitrogen and COD, the ammonia nitrogen concentration is 500mg/L, the total nitrogen concentration is 200mg/L, the total nitrogen concentration is 800mg/L, the COD is less than 500mg/L, and the adding amount of the sewage is 0.5-0.8 times of the volume of the reactor.

13. The method of claim 1, wherein: and after the aerobic reaction is carried out for 4-12h, closing the gas distribution equipment, carrying out anoxic or anaerobic reaction, after the aerobic reaction is carried out for 4-12h, opening the gas distribution equipment, carrying out the aerobic reaction, and sequentially and alternately operating until the effluent meets the discharge requirement.

14. The method of claim 13, wherein: if the ammonia nitrogen in the effluent does not reach the standard, prolonging the aerobic reaction time by 0.5-1h each time; if the ammonia nitrogen reaches the standard and the total nitrogen does not reach the standard, the aerobic reaction time is reduced by 0.5-1h each time until the effluent meets the requirement.

15. The method of claim 1, wherein: the pH value in the treatment process is controlled to be 7-9, and the treatment temperature is controlled to be 25-35 ℃.