Carbon source precise dosing system and method

Abstract

The application provides a carbon source precise dosing system and method, which comprises a carbon source medicament tank, a control module and sequentially communicated pretreatment unit, anaerobic unit, anoxic unit, aerobic unit, secondary sedimentation tank and clear water tank, the secondary sedimentation tank is further communicated with a cyclone reactor, the aerobic unit is communicated with the anoxic unit to form internal reflux, the secondary sedimentation tank is communicated with the anaerobic unit to form external reflux, the cyclone reactor is communicated with the anoxic unit to form cyclone liquid reflux, the carbon source medicament tank is communicated with multiple dosing points, the multiple dosing points are located in the anoxic unit, and the control module is used for monitoring data parameters of the pretreatment unit, the anaerobic unit, the anoxic unit, the aerobic unit, the cyclone reactor, the secondary sedimentation tank, the clear water tank and the carbon source medicament tank, so as to adjust the dosing points and dosing amount of the carbon source medicament tank and the flow of reflux feedback.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a carbon source precision dosing system and method. Background Technology

[0002] Currently, some wastewater treatment plants have high operating costs for carbon source dosing devices. In order to ensure that the effluent meets the standards, they set a large margin of regulating agents, resulting in excessive carbon source dosing per unit volume of treated water, and there is an overdosing phenomenon. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the purpose of this invention is to provide a carbon source precision dosing system and method that can improve the accuracy and efficiency of carbon source dosing through process regulation and intelligent control measures.

[0004] This invention provides a precise carbon source dosing system, comprising a carbon source reagent tank, a control module, and a pretreatment unit, an anaerobic unit, an anoxic unit, an aerobic unit, a secondary sedimentation tank, and a clear water tank connected in sequence. The secondary sedimentation tank is also connected to a cyclone reactor. The aerobic unit is connected to the anoxic unit to form an internal reflux, the secondary sedimentation tank is connected to the anaerobic unit to form an external reflux, and the cyclone reactor is connected to the anoxic unit to form a cyclone liquid reflux. The carbon source reagent tank is connected to multiple dosing points, and the multiple dosing points are located in the anoxic unit. The unit comprises a pretreatment unit, an anaerobic unit, an anoxic unit, an aerobic unit, a cyclone reactor, a secondary sedimentation tank, a clear water tank, and a carbon source reagent tank, all of which are electrically connected to the control module. The control module monitors the data parameters of the pretreatment unit, the anaerobic unit, the anoxic unit, the aerobic unit, the cyclone reactor, the secondary sedimentation tank, the clear water tank, and the carbon source reagent tank to adjust the dosing point and dosage of the carbon source reagent tank, as well as the reflux feedback flow rate.

[0005] Furthermore, the pretreatment unit is connected to the front zone of the anoxic unit via a biological tank inlet pipe. The biological tank inlet pipe is equipped with a biological tank inlet flow meter and a biological tank inlet regulating valve, which are electrically connected to the control module.

[0006] Furthermore, the carbon source reagent tank is connected to a first connecting pipe and a second connecting pipe. The first connecting pipe and the second connecting pipe are respectively connected to the front area of ​​the anoxic unit and the rear area of ​​the anoxic unit. A first dosing pump and a second dosing flow meter are installed on the first connecting pipe, and a second dosing pump and a first dosing flow meter are installed on the second connecting pipe. The first dosing pump, the second dosing pump, the first dosing flow meter and the second dosing flow meter are respectively electrically connected to the control module.

[0007] Furthermore, the aerobic unit and the anoxic unit are connected through an internal reflux pipe, and an internal reflux pump and an internal reflux flow meter are installed on the internal reflux pipe. The internal reflux pump and the internal reflux flow meter are electrically connected to the control module, respectively.

[0008] Furthermore, the secondary sedimentation tank is connected to the anaerobic unit via an external reflux pipe, which is equipped with an external reflux pump and an external reflux flow meter. The external reflux pump and the external reflux flow meter are electrically connected to the control module, respectively.

[0009] Furthermore, the secondary sedimentation tank and the cyclone reactor are connected by a connecting pipe, and a lift pump is installed on the connecting pipe. The cyclone reactor and the anoxic unit are connected by a cyclone liquid return pipe, and a cyclone outlet flow meter and a cyclone outlet regulating valve are installed on the cyclone liquid return pipe. The cyclone outlet regulating valve, the cyclone outlet flow meter, and the lift pump are electrically connected to the control module.

[0010] Furthermore, the pretreatment unit is equipped with a total nitrogen detector, an ammonia nitrogen detector, and a chemical oxygen demand (COD) detector; the anoxic unit is equipped with a nitrate nitrogen detector; the aerobic unit is equipped with a dissolved oxygen detector and a nitrate nitrogen detector; and the clear water tank is equipped with a total nitrogen detector. The total nitrogen detector, ammonia nitrogen detector, COD detector, nitrate nitrogen detector, dissolved oxygen detector, nitrate nitrogen detector, and clear water tank total nitrogen detector are all electrically connected to the control module.

[0011] Furthermore, it also includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the pretreatment unit, and the outlet pipe is connected to the clear water tank. An inlet flow meter is installed on the inlet pipe, and the inlet flow meter is electrically connected to the control module.

[0012] The present invention also provides a method for precise carbon source dosing, employing the precise carbon source dosing system described in any one of the above-mentioned methods, comprising:

[0013] The control module collects the first data parameters of the hypoxia unit;

[0014] The control module determines whether the first data parameter is greater than the limit value of the hypoxia unit;

[0015] If so, that is, when the first data parameter is greater than the limit value, the control module calculates and adjusts the dosing point and dosing amount of the carbon source reagent tank and the flow rate of the reflux feedback.

[0016] Furthermore, the method also includes:

[0017] If not, that is, if the first data parameter is less than or equal to the limit value, the control module analyzes the second data parameter of the aerobic unit and the third data parameter of the clear water tank, and calculates and adjusts the dosing point and dosage of the carbon source reagent tank and the flow rate of the reflux feedback based on the analysis results.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The carbon source precision dosing system provided by this invention, through multi-point carbon source dosing and a reflux feedback mechanism, can improve the accuracy and efficiency of carbon source dosing based on process regulation and intelligent control measures, avoiding high chemical consumption. At the same time, by adding a cyclone reactor, the intensity of microbial cell wall disruption in the residual sludge can be regulated by controlling the cyclone reactor. Furthermore, the treated cyclone liquid can be refluxed to the anoxic unit to provide a carbon source for the denitrification process, realizing the resource utilization of residual sludge. It has good environmental and economic benefits and is of great significance for energy conservation and consumption reduction in wastewater treatment plants.

[0020] This precise carbon source dosing method is implemented through the aforementioned precise carbon source dosing system, and because it incorporates the technical solution of the aforementioned precise carbon source dosing system, it has corresponding technical effects. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of a carbon source precision dosing system provided in an embodiment of the present invention;

[0023] Figure 2 This is a flowchart illustrating a precise carbon source addition method provided in an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Pretreatment unit; 2. Anaerobic unit; 3. Anoxic unit; 4. Aerobic unit; 5. Cyclone reactor; 6. Secondary sedimentation tank; 7. Clear water tank; 8. Carbon source reagent tank; 9. Control module; 10. Inlet flow meter; 11. Total nitrogen detector for pretreatment unit; 12. Ammonia nitrogen detector for pretreatment unit; 13. Chemical oxygen demand detector for pretreatment unit; 14. Inlet flow meter for biological treatment tank; 15. Regulating valve for biological treatment tank inlet pipe; 16. Level gauge; 17. 18. First dosing pump; 19. Second dosing pump; 20. First dosing flow meter; 21. Second dosing flow meter; 22. Nitrate nitrogen detector for anoxic unit; 23. Dissolved oxygen meter for aerobic unit; 24. Nitrate nitrogen detector for aerobic unit; 25. Total nitrogen detector for clear water tank; 26. Internal reflux flow meter; 27. Swirl outlet regulating valve; 28. Internal reflux pump; 29. ​​Swirl outlet flow meter; 30. Booster pump; 31. External reflux flow meter; 32. External reflux pump. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] Please see Figure 1 The diagram illustrates a precise carbon source dosing system provided in this application embodiment. It includes a carbon source reagent tank 8, a control module 9, and sequentially connected pretreatment unit 1, anaerobic unit 2, anoxic unit 3, aerobic unit 4, secondary sedimentation tank 6, and clear water tank 7. The secondary sedimentation tank 6 is also connected to a cyclone reactor 5. The aerobic unit 4 and anoxic unit 3 are connected to form an internal reflux, the secondary sedimentation tank 6 and anaerobic unit 2 are connected to form an external reflux, and the cyclone reactor 5 and anoxic unit 3 are connected to form a cyclone liquid reflux. The carbon source reagent tank 8 is connected to multiple dosing devices. Multiple dosing points are located in the anoxic unit 3. The pretreatment unit 1, anaerobic unit 2, anoxic unit 3, aerobic unit 4, cyclone reactor 5, secondary sedimentation tank 6, clear water tank 7, and carbon source reagent tank 8 are electrically connected to the control module 9. The control module 9 is used to monitor the data parameters of the pretreatment unit 1, anaerobic unit 2, anoxic unit 3, aerobic unit 4, cyclone reactor 5, secondary sedimentation tank 6, clear water tank 7, and carbon source reagent tank 8, so as to adjust the dosing point and dosage of the carbon source reagent tank 8 and the flow rate of the reflux feedback.

[0028] In one specific embodiment, the system includes a carbon source reagent tank 8, a control module 9, and an inlet pipe, a pretreatment unit 1, an anaerobic unit 2, an anoxic unit 3, an aerobic unit 4, a secondary sedimentation tank 6, a clear water tank 7, and an outlet pipe connected in sequence. The carbon source reagent tank 8 is electrically connected to the control module 9.

[0029] The pretreatment unit 1 and the front zone of the anoxic unit 3 are connected through the biological tank inlet pipe. The biological tank inlet pipe is equipped with a biological tank inlet pipe flow meter 14 and a biological tank inlet pipe regulating valve 15. The biological tank inlet pipe flow meter 14 and the biological tank inlet pipe regulating valve 15 are electrically connected to the control module 9 respectively.

[0030] The aerobic unit 4 and the anoxic unit 3 are connected through an internal reflux pipe. An internal reflux pump 27 and an internal reflux flow meter 25 are installed on the internal reflux pipe. The internal reflux pump 27 and the internal reflux flow meter 25 are electrically connected to the control module 9 respectively.

[0031] The secondary sedimentation tank 6 is connected to the anaerobic unit 2 via an external return pipe. An external return pump 31 and an external return flow meter 30 are installed on the external return pipe. The external return pump 31 and the external return flow meter 30 are electrically connected to the control module 9. The secondary sedimentation tank 6 is also connected to the cyclone reactor 5 via a connecting pipe. A lift pump 29 is installed on the connecting pipe. The cyclone reactor 5 is connected to the anoxic unit 3 via a cyclone liquid return pipe. A cyclone outlet flow meter 28 and a cyclone outlet regulating valve 26 are installed on the cyclone outlet flow meter 28. The cyclone outlet regulating valve 26, the cyclone outlet flow meter 28, and the lift pump 29 are electrically connected to the control module 9.

[0032] The carbon source reagent tank 8 is connected to a first connecting pipe and a second connecting pipe. The first connecting pipe and the second connecting pipe are respectively connected to the middle zone and the rear zone of the anoxic unit 3. A first dosing pump 17 and a second dosing flow meter 20 are installed on the first connecting pipe. A second dosing pump 18 and a first dosing flow meter 19 are installed on the second connecting pipe. The first dosing pump 17, the second dosing pump 18, the first dosing flow meter 19 and the second dosing flow meter 20 are respectively electrically connected to the control module 9.

[0033] The system includes an inlet flow meter 10 on the inlet pipe, a total nitrogen detector 11, an ammonia nitrogen detector 12, and a chemical oxygen demand (COD) detector 13 in the pretreatment unit 1, a nitrate nitrogen detector 21 in the anoxic unit 3, a dissolved oxygen detector 22 and a nitrate nitrogen detector 23 in the aerobic unit 4, and a total nitrogen detector 24 in the clear water tank 7. The inlet flow meter 10, the total nitrogen detector 11, the ammonia nitrogen detector 12, the COD detector 13, the nitrate nitrogen detector 21, the dissolved oxygen detector 22, the nitrate nitrogen detector 23, and the total nitrogen detector 24 are all electrically connected to the control module 9.

[0034] Optionally, a level gauge 16 is installed on the carbon source reagent tank 8, and the level gauge 16 is electrically connected to the control module 9.

[0035] In this embodiment, the precise carbon source dosing system comprises three parts: a carbon source intelligent dosing system, an influent distribution ratio adjustment system, and a cyclone liquid reflux system. The carbon source intelligent dosing system establishes a denitrification process model covering assimilation, short-cut denitrification, and denitrification processes based on the basic principles of microbial denitrification. The system adjusts the carbon source dosage, dosing point, and reflux feedback flow rate according to the model calculation results. In addition, the dosing results are verified by the nitrate nitrogen detector 23 in the aerobic unit, and secondary adjustments are made based on the verification results.

[0036] The influent distribution and regulation system adds a bypass between pretreatment unit 1 and anoxic unit 3, introducing a stream of wastewater into the front zone of anoxic unit 3, utilizing the carbon source in the wastewater for denitrification, saving carbon source addition, and adjusting the influent distribution ratio by substituting the influent carbon-nitrogen ratio, influent flow rate, nitrate-nitrogen ratio of the biochemical unit and other indicators into the model for calculation.

[0037] The cyclone liquid recirculation system utilizes the cyclone shear force generated by the cyclone reactor 5 during the cyclone process to quickly break down the cell wall structure of the remaining sludge, enabling microbial cells to break down and release intracellular substances, providing a carbon source for denitrification. The recirculation flow rate and cyclone intensity are calculated by substituting indicators such as nitrate nitrogen, recirculation flow rate, total nitrogen in effluent, and influent flow rate into the model.

[0038] The system adds carbon source at two points: the front and rear zones of the anoxic unit 3. Based on the detection values ​​of the nitrate nitrogen detector 21 in the anoxic unit, the system performs model calculations to obtain the dosage and reflux feedback flow rate at each addition point in the anoxic unit 3. At the same time, the system uses the nitrate nitrogen detector 23 in the aerobic unit to verify the addition results and makes secondary adjustments based on the verification results. This improves the accuracy and efficiency of carbon source addition and avoids high chemical consumption.

[0039] By adding influent distribution and regulation measures, a stream of wastewater enters the pre-zone of anoxic unit 3, where denitrification is carried out using carbon sources in the wastewater, saving carbon source addition. By adding a cyclone reactor 5, the centrifugal force and shear force of the cyclone reactor 5 can be adjusted by controlling the flow rate or rotation speed of the cyclone reactor 5, thereby controlling the intensity of cell wall disruption of microorganisms in the remaining sludge. The treated supernatant can also be returned to anoxic unit 3 to provide a carbon source for the denitrification process.

[0040] Please see Figure 2 The illustration shows a method for precise carbon source dosing provided in an embodiment of this application. The method includes:

[0041] Step S101: Control module 9 acquires the first data parameters of hypoxia unit 3;

[0042] Step S102: Control module 9 determines whether the first data parameter is greater than the limit value of hypoxia unit 3;

[0043] Step S1031: If so, that is, if the first data parameter is greater than the limit value, the control module 9 calculates and adjusts the addition point and amount of carbon source reagent tank 8 and the flow rate of reflux feedback;

[0044] Step S1032: If not, that is, if the first data parameter is less than or equal to the limit value, the control module analyzes the second data parameter of the collected aerobic unit 4 and the third data parameter of the clear water tank 7, and calculates and adjusts the addition point and dosage of the carbon source reagent tank 8 and the flow rate of the reflux feedback based on the analysis results.

[0045] In one specific embodiment, the method includes:

[0046] The control module 9 collects the detection values ​​of the nitrate nitrogen detector 21 in the anoxic unit.

[0047] The control module 9 determines whether the detected value of the nitrate nitrogen detector 21 in the anoxic unit is greater than the limit value of the nitrate nitrogen detector 21 in the anoxic unit;

[0048] If the detected value of the anoxic unit nitrate nitrogen detector 21 is greater than the limit value of the anoxic unit nitrate nitrogen detector 21, the control module 9 calculates based on data parameters such as influent parameters, process operating parameters, and online instrument data. Based on the calculation results, it instructs to increase the flow rate of the internal reflux pump 27. The control module 9 continues to collect the detected value of the anoxic unit nitrate nitrogen detector 21 within a preset time period and compares the detected value of the anoxic unit nitrate nitrogen detector 21 with the limit value of the anoxic unit nitrate nitrogen detector 21. If the detected value is still greater than the limit value, the control module 9 calculates again and instructs the first dosing pump 17 and the second dosing pump 18 to increase the carbon source dosage based on the calculation results, so that the data parameters of the first dosing flow meter 19 and the second dosing flow meter 20 are consistent with the calculation results.

[0049] If not, i.e., the detected value of the nitrate nitrogen detector 21 in the anoxic unit is less than or equal to the limit value of the nitrate nitrogen detector 21 in the anoxic unit, the control module 9 continues to collect the detected values ​​of the nitrate nitrogen detector 23 in the aerobic unit and the total nitrogen detector 24 in the clear water tank, and compares the two; if the detected value of the nitrate nitrogen detector 23 in the aerobic unit is greater than the detected value of the total nitrogen detector 24 in the clear water tank, the control module 9 performs calculations and, based on the calculation results, instructs the first dosing pump 17 and the second dosing pump 18 to reduce the carbon source dosage, and instructs the internal reflux pump 27 to reduce the flow rate; if the detected value of the nitrate nitrogen detector 23 in the aerobic unit is less than or equal to the detected value of the total nitrogen detector 24 in the clear water tank, the control module 9 performs calculations and, based on the calculation results, instructs the internal reflux pump 27 to increase the flow rate, and instructs the first dosing pump 17 and the second dosing pump 18 to gradually and finely increase the carbon source dosage, and collects the data parameters of the first dosing flow meter 19 and the second dosing flow meter 20 in real time to ensure that they are consistent with the calculation results;

[0050] The control module 9 collects the detection value of the nitrate nitrogen detector 23 in the aerobic unit to verify the carbon source addition result. If the detection value of the nitrate nitrogen detector 23 in the aerobic unit is greater than the set value, the control module 9 performs calculations and increases the carbon source addition amount according to the calculation results, forming a secondary feedback adjustment.

[0051] The control module 9 calculates the allocated water volume by collecting the carbon-nitrogen ratio of the influent, the influent flow rate, and the nitrate-nitrogen content of the anoxic unit 3, and adjusts the regulating valve 15 of the influent pipe of the biological treatment tank so that the flow rate of the flow meter 14 of the influent pipe of the biological treatment tank matches the calculation result, thereby achieving the target ratio.

[0052] The control module 9 calculates the swirling liquid return flow rate and swirling intensity of the swirling reactor 5 by collecting indicators such as nitrate nitrogen content, internal return flow rate, total nitrogen content in effluent, and influent flow rate of the anoxic unit 3. When the remaining sludge in the secondary sedimentation tank 6 is pumped into the swirling reactor 5 by the lift pump 29, the swirling intensity is adjusted by controlling the flow rate and changing the rotation speed to regulate the centrifugal force and shear force of the reactor, thereby controlling the intensity of cell wall disruption of microorganisms in the remaining sludge. Finally, the return flow rate to the anoxic unit 3 is adjusted by the swirling outlet regulating valve 26.

[0053] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A carbon source precise dosing system, characterized in that, The carbon source medicament tank (8), the control module (9) and the sequentially communicated pretreatment unit (1), anaerobic unit (2), anoxic unit (3), aerobic unit (4), secondary sedimentation tank (6) and clear water tank (7) are included, the secondary sedimentation tank (6) is also communicated with the cyclone reactor (5), the aerobic unit (4) is communicated with the anoxic unit (3) to form internal reflux, the secondary sedimentation tank (6) is communicated with the anaerobic unit (2) to form external reflux, the cyclone reactor (5) is communicated with the anoxic unit (3) to form cyclone liquid reflux, the carbon source medicament tank (8) is communicated with multiple dosing points, multiple dosing points are located in the anoxic unit (3), the pretreatment unit (1), the anaerobic unit (2), the anoxic unit (3), the aerobic unit (4), the cyclone reactor (5), the secondary sedimentation tank (6), the clear water tank (7) and the carbon source medicament tank (8) are electrically connected with the control module (9) respectively, the control module (9) is used for monitoring the data parameters of the pretreatment unit (1), the anaerobic unit (2), the anoxic unit (3), the aerobic unit (4), the cyclone reactor (5), the secondary sedimentation tank (6), the clear water tank (7) and the carbon source medicament tank (8) to adjust the dosing point and dosing amount of the carbon source medicament tank (8) and the flow of reflux feedback; Wherein, the cyclone liquid reflux amount and cyclone intensity of the cyclone reactor (5) are calculated according to the nitrate nitrogen content, internal reflux amount, total nitrogen amount of effluent and influent amount of the anoxic unit (3).

2. The carbon source precise dosing system according to claim 1, characterized in that, The pretreatment unit (1) is communicated with the front area of the anoxic unit (3) through a biochemical tank influent pipe, a biochemical tank influent pipe flow meter (14) and a biochemical tank influent pipe regulating valve (15) are arranged on the biochemical tank influent pipe, and the biochemical tank influent pipe flow meter (14) and the biochemical tank influent pipe regulating valve (15) are electrically connected with the control module (9) respectively.

3. The carbon source precise dosing system according to claim 1, wherein, The carbon source medicament tank (8) is communicated with a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are communicated with the front area of the anoxic unit (3) and the rear area of the anoxic unit (3) respectively, a first dosing pump (17) and a second dosing flow meter (20) are arranged on the first connecting pipe, a second dosing pump (18) and a first dosing flow meter (19) are arranged on the second connecting pipe, and the first dosing pump (17), the second dosing pump (18), the first dosing flow meter (19) and the second dosing flow meter (20) are electrically connected with the control module (9) respectively.

4. The carbon source precise dosing system according to claim 1, wherein, The aerobic unit (4) is communicated with the anoxic unit (3) through an internal reflux pipe, an internal reflux pump (27) and an internal reflux flow meter (25) are arranged on the internal reflux pipe, and the internal reflux pump (27) and the internal reflux flow meter (25) are electrically connected with the control module (9) respectively.

5. The carbon source precise dosing system according to claim 1, wherein, The secondary sedimentation tank (6) is communicated with the anaerobic unit (2) through an external reflux pipe, an external reflux pump (31) and an external reflux flow meter (30) are arranged on the external reflux pipe, and the external reflux pump (31) and the external reflux flow meter (30) are electrically connected with the control module (9) respectively.

6. The carbon source precise dosing system according to claim 1, wherein, The secondary sedimentation tank (6) is communicated with the hydrocyclone reactor (5) through a connecting pipe, a lifting pump (29) is arranged on the connecting pipe, the hydrocyclone reactor (5) is communicated with the anoxic unit (3) through a hydrocyclone liquid reflux pipe, a hydrocyclone outlet flow meter (28) and a hydrocyclone outlet adjusting valve (26) are arranged on the hydrocyclone liquid reflux pipe, and the hydrocyclone outlet adjusting valve (26), the hydrocyclone outlet flow meter (28) and the lifting pump (29) are electrically connected with the control module (9) respectively.

7. The carbon source precise dosing system according to claim 1, wherein, The pretreatment unit (1) is provided with a pretreatment unit total nitrogen detector (11), a pretreatment unit ammonia nitrogen detector (12) and a pretreatment unit chemical oxygen demand detector (13), the anoxic unit (3) is provided with an anoxic unit nitrate nitrogen detector (21), the aerobic unit (4) is provided with an aerobic unit dissolved oxygen detector (22) and an aerobic unit nitrate nitrogen detector (23), and the clear water tank (7) is provided with a clear water tank total nitrogen detector (24); the pretreatment unit total nitrogen detector (11), the pretreatment unit ammonia nitrogen detector (12), the pretreatment unit chemical oxygen demand detector (13), the anoxic unit nitrate nitrogen detector (21), the aerobic unit dissolved oxygen detector (22), the aerobic unit nitrate nitrogen detector (23) and the clear water tank total nitrogen detector (24) are electrically connected with the control module (9) respectively.

8. The system for precise addition of carbon source according to any one of claims 1 to 7, characterized in that, Further comprising an inlet pipe and an outlet pipe, the inlet pipe is communicated with the pretreatment unit (1), the outlet pipe is communicated with the clear water tank (7), and an inlet flow meter (10) is arranged on the inlet pipe and electrically connected with the control module (9).

9. A carbon source precise dosing method using the carbon source precise dosing system according to any one of claims 1 to 8, characterized by, The control module (9) collects the first data parameter of the anoxic unit (3); The control module (9) judges whether the first data parameter is greater than a limited value of the anoxic unit (3); If yes, that is, in the case that the first data parameter is greater than the limited value, the control module (9) calculates and adjusts the dosing point and dosing amount of the carbon source medicament tank (8) and the reflux feedback flow rate; The hydrocyclone liquid reflux flow rate and the hydrocyclone intensity of the hydrocyclone reactor (5) are calculated according to the nitrate nitrogen content, the internal reflux flow rate, the total nitrogen amount of outlet water and the inlet water amount of the anoxic unit (3). The method further comprises:

10. The method according to claim 9, wherein, If no, that is, in the case that the first data parameter is less than or equal to the limited value, the control module (9) analyzes the second data parameter of the aerobic unit (4) and the third data parameter of the clear water tank (7) collected, and calculates and adjusts the dosing point and dosing amount of the carbon source medicament tank (8) and the reflux feedback flow rate according to the analysis result. ​

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