CN112110606B - Treatment system and method for removing total nitrogen in polytetrafluoroethylene dispersion resin wastewater - Google Patents
Treatment system and method for removing total nitrogen in polytetrafluoroethylene dispersion resin wastewater Download PDFInfo
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Abstract
The invention relates to a treatment technology of wastewater in chemical industry production, in particular to a treatment system and a treatment method for removing total nitrogen in polytetrafluoroethylene dispersion resin wastewater, which comprises a water storage tank, a high-speed shear pump, a filter press, an adjusting tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank and a backflow sedimentation tank which are sequentially connected, wherein the primary anoxic tank and the secondary anoxic tank are connected with a carbon source adding device, the primary aerobic tank and the secondary aerobic tank are connected with an alkaline substance adding device, the secondary aerobic tank is connected with the primary anoxic tank through a backflow pump, and a backflow outlet of the backflow sedimentation tank is connected with the secondary aerobic tank. The invention breaks emulsion by a high-speed shear pump to separate out resin, then enters a filter press for filter pressing, the filter material is recycled, and the total nitrogen in the pretreated wastewater is removed by preposed denitrification, primary aerobic action, postposition denitrification and secondary aerobic action, so that the total nitrogen concentration of the dispersed wastewater can be less than 10 ppm.
Description
Technical Field
The invention relates to a chemical production wastewater treatment technology, in particular to a treatment system and a treatment method for removing total nitrogen in polytetrafluoroethylene dispersion resin wastewater.
Background
The waste water produced by the polytetrafluoroethylene dispersion resin contains non-coagulated polytetrafluoroethylene, and because of the existence of the surfactant, the polytetrafluoroethylene and water are in a complete mutual solution state, so that the standard discharge of the waste water is influenced, and the loss of the dispersion resin causes resource waste. The national requirements on the drainage control indexes outside the chemical enterprises are getting stricter, the total nitrogen indexes are included, the total nitrogen is not stably treated by the common biochemical treatment method, the total nitrogen is removed by adding sodium hypochlorite at the tail end, and the standard discharge is ensured.
The patent CN110563196A and the patent CN200910098261 respectively adopt PAC (polyaluminium chloride) and calcium salt to demulsify the dispersed waste water and recover the precipitated resin, but the method influences the processing performance and color of the recovered material and increases the treatment cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system and the method can ensure that the discharged wastewater meets the national industrial wastewater discharge standard, protect the environment, effectively recover the dispersion resin and make the best use of the dispersion resin.
The treatment system for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater comprises a water storage tank, a high-speed shear pump, a filter press, an adjusting tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank and a reflux sedimentation tank which are sequentially connected, wherein the primary anoxic tank and the secondary anoxic tank are connected with a carbon source adding device, the primary aerobic tank and the secondary aerobic tank are connected with an alkaline substance adding device, the secondary aerobic tank is connected with the primary anoxic tank through the reflux pump, and a reflux outlet of the reflux sedimentation tank is connected with the secondary aerobic tank.
The reflux sedimentation tank is connected with the sedimentation tank, the sludge pump and the plate-and-frame filter press in sequence.
The aeration device is connected with the roots blower, the roots blower is controlled in a variable frequency mode, and the aeration device is used for aerating the primary aerobic tank, the secondary anoxic tank and the secondary aerobic tank to adjust the dissolved oxygen value in the tank.
The first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank and the second-stage aerobic tank are internally provided with a plurality of submersible mixers, preferably two.
An aeration device and a submersible stirrer are arranged in the primary aerobic tank, the secondary anoxic tank and the secondary aerobic tank simultaneously so as to realize the flexible control of anoxic-aerobic states. When the low-load operation is carried out, the submersible mixer of the aerobic tank is started, and the aeration rate of the air blower is reduced through frequency conversion, so that excessive aeration is avoided.
The treatment method for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater adopts the treatment system for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater to treat the wastewater, and comprises the following steps:
1) the method comprises the following steps of pretreating the wastewater, wherein the wastewater contains polytetrafluoroethylene dispersed resin particles which are not demulsified, the wastewater enters a high-speed shear pump through a water storage tank, the resin is demulsified and separated out through the high-speed shear pump, the wastewater enters a filter press for filter pressing, filter materials are recycled and used as low-end products, and the filtered wastewater enters a regulating tank;
2) the wastewater without resin enters a two-stage nitrification and denitrification system to remove total nitrogen, a denitrification carbon source is added into a first-stage anoxic tank and a second-stage anoxic tank, an alkaline substance is added into a first-stage aerobic tank and a second-stage aerobic tank to adjust the pH value, the pretreated wastewater is collected by an adjusting tank, is conveyed to the first-stage anoxic tank through a water pump to carry out denitrification reaction, is then sequentially introduced into the first-stage aerobic tank, the second-stage anoxic tank and the second-stage aerobic tank, carries out ammoniation reaction and nitrification reaction in the first-stage aerobic tank and the second-stage aerobic tank, and carries out denitrification reaction in the second-stage anoxic tank;
3) and conveying the mixed liquid in the secondary aerobic tank to a reflux sedimentation tank for sludge-water separation.
The rotating speed of the high-speed shear pump in the step 1) is 8000-10000rpm, so that PTFE resin contained in the wastewater is fully demulsified and separated, the influence of adding a flocculating agent for demulsification on the processability and color of the reclaimed materials is avoided, and the production cost is reduced.
And (4) the wastewater after demulsification enters a filter press for filter pressing, the dehydrated resin is intensively recovered, and then the dehydrated resin is dried and processed to be used as a low-end product.
In the step 2), the dissolved oxygen value is controlled to be 0.2-0.5mg/L in the denitrification reaction of the first-stage anoxic tank and the second-stage anoxic tank, and the sludge concentration is controlled to be 3000-3500 mg/L.
In the step 2), the dissolved oxygen value is controlled to be 2.5-4.5mg/L, the sludge concentration is controlled to be 3000-3500mg/L and the pH value is controlled to be 8.0-8.5 in the wastewater ammoniation reaction and the nitration reaction of the primary aerobic tank and the secondary aerobic tank.
And 3) after the reflux sedimentation tank separates the sludge from the water, discharging the supernatant, returning part of the sludge to a secondary aerobic tank, returning the mixed liquid of the secondary aerobic tank and the reflux sedimentation tank to a primary anoxic tank to ensure the sludge concentration in the system, and denitrifying the nitrate nitrogen in the returned sludge to play a role in denitrification, wherein the return flow of the mixed liquid is 200-300% of the volume or the mass of the wastewater to be treated.
The reflux pump is additionally arranged at the tail end of the secondary aerobic tank, so that the large-flow reflux of the nitrified liquid can be realized, and the standard discharge of the total nitrogen of the wastewater is realized by utilizing the biochemical process through strengthening the nitrification-denitrification function.
And the residual sludge in the reflux sedimentation tank is treated by the sedimentation tank and the sludge tank, and then is pumped into a plate-and-frame filter press by a sludge pump for treatment, and then is transported outside.
The present invention relates to an ammoniation reaction, a nitration reaction and a denitrification reaction. Ammoniation reaction, organic nitrogen in the wastewater is converted into ammonia nitrogen. The nitrification reaction is carried out to convert nitrogen and nitrogen in the wastewater into nitrate nitrogen, the process needs to be carried out under the condition of oxygen, firstly ammonia nitrogen is converted into nitrite nitrogen under the action of nitrite bacteria, then the nitrite nitrogen is converted into nitrate nitrogen under the action of nitrate bacteria, and as a large amount of alkalinity needs to be consumed in the reaction process, alkaline substances need to be added into the wastewater for supplement. And (4) performing denitrification reaction to convert nitrate nitrogen and nitrite nitrogen in the wastewater into nitrogen. The system carries out ammoniation reaction and nitration reaction in the first-stage aerobic tank and the second-stage aerobic tank, converts organic nitrogen into nitrate nitrogen, carries out denitrification reaction in the first-stage anoxic tank and the second-stage anoxic tank, converts combined nitrogen into molecular nitrogen, obtains the effect of decarbonization and denitrification, has the function of biological selection, and prevents sludge from expanding.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention breaks the emulsion through a high-speed shear pump to separate out resin, then enters a filter press to be pressed, filter materials are recycled and used as low-end products, and the pretreated wastewater is subjected to prepositive denitrification, primary aerobic action, postpositive denitrification and secondary aerobic action to remove the total nitrogen in the water, so that the concentration of the total nitrogen in the dispersed wastewater can be less than 10ppm and the dispersed wastewater can reach the discharge standard.
2. The invention strengthens the function of nitrification-denitrification through the first-stage anoxic tank and the second-stage aerobic tank, realizes the standard discharge of the total nitrogen of the wastewater by utilizing the biochemical process, not only ensures that the discharged wastewater meets the national industrial wastewater discharge standard and protects the environment, but also can effectively recycle the dispersion resin and make the best use of the substances.
3. The anoxic tank is arranged in front, part of organic matters in the water are removed by using the denitrification process, the organic load of the aerobic section is reduced, the alkalinity generated in the denitrification process can partially compensate the alkalinity consumed in the nitrification process, the sedimentation performance of the activated sludge can be improved, and the sludge bulking can be controlled.
Drawings
FIG. 1 is a schematic flow diagram of a treatment system for removing total nitrogen from wastewater containing PTFE dispersed resin according to the present invention;
in the figure: 1. a water storage tank; 2. a high speed shear pump; 3. a filter press; 4. a regulating tank; 5. a first-stage anoxic tank; 6. a carbon source adding device; 7. a primary aerobic tank; 8. a secondary anoxic tank; 9. an alkaline substance adding device; 10. a secondary aerobic tank; 11. a submersible mixer; 12. an aeration device; 13. a Roots blower; 14. a reflux pump; 15. a reflux sedimentation tank; 16. a sedimentation tank; 17. a sludge tank; 18. a sludge pump; 19. and (4) a plate-and-frame filter press.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the treatment system for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersed resin comprises a water storage tank 1, a high-speed shear pump 2, a filter press 3, an adjusting tank 4, a first-stage anoxic tank 5, a first-stage aerobic tank 7, a second-stage anoxic tank 8, a second-stage aerobic tank 10 and a reflux sedimentation tank 15 which are connected in sequence, wherein the first-stage anoxic tank 5 and the second-stage anoxic tank 8 are connected with a carbon source adding device 6, the first-stage aerobic tank 7 and the second-stage aerobic tank 10 are connected with an alkaline substance adding device 9, the second-stage aerobic tank 10 is connected with the first-stage anoxic tank 5 through a reflux pump 14, and a reflux outlet of the reflux sedimentation tank 15 is connected with the second-stage aerobic tank 10.
The reflux sedimentation tank 15 is connected with a sedimentation tank 16, a sludge tank 17, a sludge pump 18 and a plate-and-frame filter press 19 in sequence.
And aeration devices 12 are arranged in the first-stage aerobic tank 7, the second-stage anoxic tank 8 and the second-stage aerobic tank 10, and the aeration devices 12 are connected with a roots blower 13.
And two submersible mixers 11 are arranged in the first-stage anoxic tank 5, the first-stage aerobic tank 7, the second-stage anoxic tank 8 and the second-stage aerobic tank 10.
Example 2
The treatment method for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater comprises the following steps: the wastewater treatment system for removing the total nitrogen in the wastewater of the polytetrafluoroethylene dispersion resin, which is described in the embodiment 1, comprises the following steps:
1) the method comprises the steps of wastewater pretreatment, wherein polytetrafluoroethylene dispersion resin wastewater enters a high-speed shear pump 2 through a water storage tank 1, demulsification is carried out through the high-speed shear pump 2 to separate out resin, then the resin enters a filter press 3 to be subjected to filter pressing, filter materials are recycled, and the filtered wastewater enters an adjusting tank 4;
2) adding a denitrification carbon source into the primary anoxic tank 5 and the secondary anoxic tank 8, adding an alkaline substance into the primary aerobic tank 7 and the secondary aerobic tank 10 to adjust the pH value, conveying the wastewater in the adjusting tank 4 to the primary anoxic tank 5 for denitrification reaction, then sequentially introducing the wastewater into the primary aerobic tank 7, the secondary anoxic tank 8 and the secondary aerobic tank 10, performing ammoniation reaction and nitration reaction in the primary aerobic tank 7 and the secondary aerobic tank 10, and performing denitrification reaction in the secondary anoxic tank 8;
3) the mixed liquid in the secondary aerobic tank 10 is conveyed to a return sedimentation tank 15 for mud-water separation, supernatant is discharged, part of sludge flows back to the secondary aerobic tank 10, the mixed liquid of the returned sludge in the secondary aerobic tank 10 and the return sedimentation tank 15 flows back to the primary anoxic tank 5, the return flow of the mixed liquid is 200% of the volume of the wastewater to be treated, and the residual sludge in the return sedimentation tank 15 is treated by a sedimentation tank 16 and a sludge tank 17 and then is pumped into a plate-and-frame filter press 19 by a sludge pump 18 for treatment, and then is transported outside.
The rotating speed of the high-speed shear pump 2 in the step 1) is 8000 rpm.
In the step 2), the dissolved oxygen value is controlled to be 0.4-0.5mg/L and the sludge concentration is controlled to be 3000-3200mg/L in the denitrification reaction of the primary anoxic tank 5 and the secondary anoxic tank 8.
In the ammonification reaction and the nitration reaction of the primary aerobic tank 7 and the secondary aerobic tank 10 in the step 2), the dissolved oxygen value is controlled to be 3.5-4.5mg/L, the sludge concentration is controlled to be 3000-3200mg/L, and the pH value is controlled to be 8.0-8.2.
After the treatment, the total nitrogen concentration of the polytetrafluoroethylene dispersion resin wastewater is less than 10ppm, and the wastewater meets the national industrial wastewater discharge standard.
Example 3
The treatment method for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater comprises the following steps: the wastewater treatment system for removing the total nitrogen in the wastewater of the polytetrafluoroethylene dispersion resin, which is described in the embodiment 1, comprises the following steps:
1) the method comprises the steps of wastewater pretreatment, wherein polytetrafluoroethylene dispersion resin wastewater enters a high-speed shear pump 2 through a water storage tank 1, demulsification is carried out through the high-speed shear pump 2 to separate out resin, then the resin enters a filter press 3 to be subjected to filter pressing, filter materials are recycled, and the filtered wastewater enters an adjusting tank 4;
2) adding a denitrification carbon source into the primary anoxic tank 5 and the secondary anoxic tank 8, adding an alkaline substance into the primary aerobic tank 7 and the secondary aerobic tank 10 to adjust the pH value, conveying the wastewater in the adjusting tank 4 to the primary anoxic tank 5 for denitrification reaction, then sequentially introducing the wastewater into the primary aerobic tank 7, the secondary anoxic tank 8 and the secondary aerobic tank 10, performing ammoniation reaction and nitration reaction in the primary aerobic tank 7 and the secondary aerobic tank 10, and performing denitrification reaction in the secondary anoxic tank 8;
3) the mixed liquid in the secondary aerobic tank 10 is conveyed to the return sedimentation tank 15 for mud-water separation, supernatant liquid is discharged, part of sludge flows back to the secondary aerobic tank 10, the mixed liquid of the returned sludge in the secondary aerobic tank 10 and the return sedimentation tank 15 flows back to the primary anoxic tank 5, the return flow of the mixed liquid is 250% of the volume of the wastewater to be treated, and the residual sludge in the return sedimentation tank 15 is treated by the sedimentation tank 16 and the sludge tank 17 and then is pumped into the plate-and-frame filter press 19 by the sludge pump 18 for treatment, and then the sludge is transported outside.
The rotational speed of the high speed shear pump 2 described in step 1) is 9000 rpm.
In the step 2), the dissolved oxygen value is controlled to be 0.3-0.4mg/L in the denitrification reaction of the primary anoxic tank 5 and the secondary anoxic tank 8, and the sludge concentration is controlled to be 3100-3300 mg/L.
In the ammonification reaction and the nitration reaction of the primary aerobic tank 7 and the secondary aerobic tank 10 in the step 2), the dissolved oxygen value is controlled to be 3.0-4.0mg/L, the sludge concentration is controlled to be 3100-3300mg/L, and the pH value is controlled to be 8.1-8.3.
After the treatment, the total nitrogen concentration of the polytetrafluoroethylene dispersion resin wastewater is less than 10ppm, and the wastewater meets the national industrial wastewater discharge standard.
Example 4
The treatment method for removing the total nitrogen in the polytetrafluoroethylene dispersion resin wastewater comprises the following steps: the wastewater treatment system for removing the total nitrogen in the wastewater of the polytetrafluoroethylene dispersion resin, which is described in the embodiment 1, comprises the following steps:
1) the method comprises the steps of wastewater pretreatment, wherein polytetrafluoroethylene dispersion resin wastewater enters a high-speed shear pump 2 through a water storage tank 1, demulsification is carried out through the high-speed shear pump 2 to separate out resin, then the resin enters a filter press 3 to be subjected to filter pressing, filter materials are recycled, and the filtered wastewater enters an adjusting tank 4;
2) adding a denitrification carbon source into the primary anoxic tank 5 and the secondary anoxic tank 8, adding an alkaline substance into the primary aerobic tank 7 and the secondary aerobic tank 10 to adjust the pH value, conveying the wastewater in the adjusting tank 4 to the primary anoxic tank 5 for denitrification reaction, then sequentially introducing the wastewater into the primary aerobic tank 7, the secondary anoxic tank 8 and the secondary aerobic tank 10, performing ammoniation reaction and nitration reaction in the primary aerobic tank 7 and the secondary aerobic tank 10, and performing denitrification reaction in the secondary anoxic tank 8;
3) the mixed liquid in the secondary aerobic tank 10 is conveyed to a return sedimentation tank 15 for mud-water separation, supernatant liquid is discharged, part of sludge flows back to the secondary aerobic tank 10, the mixed liquid of the returned sludge in the secondary aerobic tank 10 and the return sedimentation tank 15 flows back to a primary anoxic tank 5, the return flow of the mixed liquid is 300% of the wastewater to be treated, and the residual sludge in the return sedimentation tank 15 is treated by a sedimentation tank 16 and a sludge tank 17 and then is pumped into a plate and frame filter press 19 by a sludge pump 18 for treatment, and then the sludge is transported outside.
The rotating speed of the high-speed shear pump 2 in the step 1) is 10000 rpm.
In the step 2), the dissolved oxygen value is controlled to be 0.2-0.3mg/L in the denitrification reaction of the first-stage anoxic tank 5 and the second-stage anoxic tank 8, and the sludge concentration is controlled to be 3300-3500 mg/L.
In the ammonification reaction and the nitration reaction of the primary aerobic tank 7 and the secondary aerobic tank 10 in the step 2), the dissolved oxygen value is controlled to be 2.5-3.5mg/L, the sludge concentration is controlled to be 3300-3500mg/L, and the pH value is controlled to be 8.3-8.5.
After the treatment, the total nitrogen concentration of the polytetrafluoroethylene dispersion resin wastewater is less than 10ppm, and the wastewater meets the national industrial wastewater discharge standard.
Comparative example 1
1) Wastewater pretreatment: adding a flocculating agent into a polytetrafluoroethylene dispersion resin wastewater storage tank, starting stirring to break emulsion of the wastewater to separate out resin, forming flocculent solid by the resin in the wastewater under the action of the flocculating agent, standing for about 20 minutes, conveying the treated wastewater to a filter press for filter pressing through a conveying pump, and recycling a filter cake.
2) Adding a denitrification carbon source into the primary anoxic tank, adding alkaline substances into the primary aerobic tank, the secondary aerobic tank and the secondary anoxic tank to adjust the pH value, conveying wastewater in the adjusting tank to the primary anoxic tank for denitrification reaction, then sequentially introducing the wastewater into the primary aerobic tank, the secondary anoxic tank and the secondary aerobic tank, performing ammoniation reaction and nitration reaction in the primary aerobic tank, the secondary anoxic tank and the secondary aerobic tank, and performing denitrification reaction in the primary anoxic tank;
in the comparative example, an aeration device in the secondary anoxic tank is started and changed into an aerobic tank for use, and the total nitrogen in the water is removed from the pretreated wastewater through the preposed primary denitrification and the primary aerobic action.
3) And (2) conveying the mixed liquid in the secondary aerobic tank to a reflux sedimentation tank for mud-water separation, discharging supernatant, returning part of sludge to the secondary aerobic tank, returning the mixed liquid of the returned sludge in the secondary aerobic tank and the reflux sedimentation tank to a primary anoxic tank, wherein the return flow of the mixed liquid is 230% of the volume of the wastewater to be treated, treating the residual sludge in the reflux sedimentation tank by the sedimentation tank and the sludge tank, pumping the treated residual sludge into a plate and frame filter press by a sludge pump, and transporting the sludge outside.
After the treatment, the total nitrogen concentration of the polytetrafluoroethylene dispersion resin wastewater is more than 20ppm, and the wastewater does not meet the national industrial wastewater discharge standard. Meanwhile, a high-speed shear pump is not used in the pretreatment, and the flocculant is added to perform demulsification, so that the operation cost is increased.
Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (9)
1. A treatment method for removing total nitrogen in polytetrafluoroethylene dispersion resin wastewater is characterized by comprising the following steps: the method comprises the following steps:
1) wastewater is pretreated, the wastewater enters a high-speed shear pump (2) through a water storage tank (1), demulsification is carried out through the high-speed shear pump (2) to separate out resin, then the wastewater enters a filter press (3) for filter pressing, filter materials are recycled, and the filtered wastewater enters an adjusting tank (4);
2) adding a denitrification carbon source into the primary anoxic tank (5) and the secondary anoxic tank (8), adding an alkaline substance into the primary aerobic tank (7) and the secondary aerobic tank (10) to adjust the pH value, conveying the wastewater in the adjusting tank (4) to the primary anoxic tank (5) for denitrification reaction, then sequentially introducing the wastewater into the primary aerobic tank (7), the secondary anoxic tank (8) and the secondary aerobic tank (10), performing ammoniation reaction and nitration reaction in the primary aerobic tank (7) and the secondary aerobic tank (10), and performing denitrification reaction in the secondary anoxic tank (8);
3) the mixed liquid in the secondary aerobic tank (10) is conveyed to a reflux sedimentation tank (15) for mud-water separation;
get rid of processing system of polytetrafluoroethylene dispersion resin waste water total nitrogen, including tank (1) that connects gradually, high-speed shear pump (2), pressure filter (3), equalizing basin (4), one-level oxygen deficiency pond (5), one-level aerobic tank (7), second grade oxygen deficiency pond (8), second grade aerobic tank (10) and backflow sedimentation tank (15), carbon source feeding device (6) are connected to one-level oxygen deficiency pond (5) and second grade oxygen deficiency pond (8), alkaline material feeding device (9) are connected to one-level aerobic tank (7) and second grade aerobic tank (10), second grade aerobic tank (10) are connected with one-level oxygen deficiency pond (5) through backwash pump (14), the backward flow export and second grade aerobic tank (10) of backflow sedimentation tank (15) are connected.
2. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: the return sedimentation tank (15) is sequentially connected with a sedimentation tank (16), a sludge tank (17), a sludge pump (18) and a plate-and-frame filter press (19).
3. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: aeration devices (12) are arranged in the first-stage aerobic tank (7), the second-stage anoxic tank (8) and the second-stage aerobic tank (10), and the aeration devices (12) are connected with a roots blower (13).
4. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: and a plurality of submersible mixers (11) are arranged in the first-stage anoxic tank (5), the first-stage aerobic tank (7), the second-stage anoxic tank (8) and the second-stage aerobic tank (10).
5. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: the rotating speed of the high-speed shearing pump (2) in the step 1) is 8000-.
6. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: in the step 2), the dissolved oxygen value is controlled to be 0.2-0.5mg/L in the denitrification reaction of the first-stage anoxic tank (5) and the second-stage anoxic tank (8), and the sludge concentration is controlled to be 3000-3500 mg/L.
7. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: in the ammonification reaction and the nitration reaction of the primary aerobic tank (7) and the secondary aerobic tank (10) in the step 2), the dissolved oxygen value is controlled to be 2.5-4.5mg/L, the sludge concentration is controlled to be 3000-3500mg/L, and the pH value is controlled to be 8.0-8.5.
8. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 1, wherein the method comprises the following steps: and 3), after mud-water separation is carried out on the reflux sedimentation tank (15), discharging the supernatant, refluxing part of the sludge to the secondary aerobic tank (10), and refluxing the mixed liquid of the secondary aerobic tank (10) and the reflux sedimentation tank (15) to the primary anoxic tank (5).
9. The method for removing total nitrogen in wastewater containing polytetrafluoroethylene dispersion according to claim 8, wherein said method comprises the steps of: the reflux amount of the mixed liquid is 200-300 percent of the volume or the mass of the wastewater to be treated.
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