Nitrogen and phosphorus removal process and reactor

Abstract

The invention relates to the technical field of sewage treatment, in particular to a nitrogen and phosphorus removal process and a reactor, the nitrogen and phosphorus removal process comprises the steps that nitrogen and phosphorus removal cycles are continuously repeated for multiple times, and each nitrogen and phosphorus removal cycle comprises the steps that sewage containing NH4 < + > and PO4 < 3-> is added into the reactor; oxygen is continuously introduced into the sewage, and the sewage is continuously stirred; stopping introducing oxygen into the sewage, stopping stirring the sewage, and adding a carbon source concentrated solution into the sewage; continuously stirring the sewage for a preset time, and standing the sewage; discharging a preset amount of supernate out of the reactor; continuously introducing oxygen into the sewage, continuously stirring the sewage, and standing the sewage. The invention aims to provide a nitrogen and phosphorus removal process and a reactor in allusion to the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a denitrification and dephosphorization process and reactor. Background Art

[0002] Traditional sewage denitrification and phosphorus removal is a combination of biological phosphorus removal and biological nitrification and denitrification. The traditional sewage biological phosphorus removal process requires two processes: anaerobic phosphorus release and aerobic phosphorus absorption; the traditional biological denitrification process requires two processes: aerobic nitrification and anoxic denitrification. Therefore, traditional sewage denitrification and phosphorus removal requires the use of anaerobic / anoxic / aerobic process (A 2 O) process is carried out. However, A 2 The O process often faces many problems during operation, including: (1) unstable process operation. Domestic sewage in my country often has a low C / N ratio, which leads to insufficient carbon source in the influent of sewage treatment plants. This will cause the denitrifying bacteria and polyphosphate bacteria in the water body to compete for high-quality carbon sources in the anaerobic stage at the beginning of the process, resulting in a decrease in the denitrification and phosphorus removal effect. (2) In order to ensure the quality of the effluent, additional carbon sources need to be added. This operation increases the possibility of secondary pollution during the sewage treatment process, which is contrary to sustainable development. (3) The process is complicated. 2 The A O process requires three stages: anaerobic, anoxic, and aerobic. On the one hand, in order to ensure the efficiency of nitrogen removal and phosphorus removal, the process sets up two return flows (sludge return from the sedimentation tank to the anaerobic tank and water supernatant return from the aerobic tank to the anoxic tank); on the other hand, each stage needs to maintain different DO concentrations to achieve different environmental conditions (anaerobic <0.2mg / L, anoxic 0.2-0.5mg / L, aerobic 2-5mg / L). The above two aspects make the entire nitrogen removal and phosphorus removal process cumbersome and complicated. It can be seen that the traditional A 2 The denitrification and phosphorus removal method is time-consuming and energy-intensive. Therefore, it is urgent to develop a low-energy consumption process that can achieve simultaneous denitrification and phosphorus removal for low C / N wastewater and achieve deep denitrification and phosphorus removal. Summary of the invention

[0003] The purpose of this application is to provide a denitrification and dephosphorization process and reactor in view of the background technology involved.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] One aspect of the present application provides a denitrification and phosphorus removal process, comprising: continuously repeating multiple denitrification and phosphorus removal cycles, each of the denitrification and phosphorus removal cycles comprising:

[0006] Add NH4 to the reactor + and PO4 3- of sewage;

[0007] continuously introducing oxygen into the sewage and continuously stirring the sewage;

[0008] Stop introducing oxygen into the sewage and stop stirring the sewage, and add a carbon source concentrate to the sewage;

[0009] After continuously stirring the sewage for a preset period of time, the sewage is allowed to stand;

[0010] discharging a predetermined amount of supernatant from the reactor;

[0011] After continuously introducing oxygen into the sewage and continuously stirring the sewage, the sewage is left to stand.

[0012] Optionally, the addition of NH4 + and PO4 3- The sewage also contains cobalt chloride (CoCl2), manganese chloride (MnCl2), ferrous sulfate (FeSO4) and ethylenediaminetetraacetic acid (EDTA).

[0013] Optionally, the addition of NH4 + and PO4 3- of sewage, including:

[0014] 5L of sewage was continuously added to the reactor within 25min, and 10L of muddy water mixture was formed in the reactor, so that NH4 + The concentration is 50±1.2mg / L, PO4 3- The concentration is 5±0.5mg / L.

[0015] Optionally, the continuously introducing oxygen into the sewage and continuously stirring the sewage comprises:

[0016] Oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 180 min.

[0017] Optionally, stopping the introduction of oxygen into the sewage and stopping the stirring of the sewage, and adding a carbon source concentrate to the sewage comprises:

[0018] 50 ml of carbon source concentrated solution was continuously introduced into the reactor within 10 minutes, and the pollutant content in the reactor was adjusted to C / N=3, wherein the carbon source concentrated solution was prepared with sodium acetate.

[0019] Optionally, after continuously stirring the sewage for a preset period of time, leaving the sewage to stand, comprises:

[0020] After continuously stirring the sewage for 30 minutes, the sewage was left to stand for 6 minutes to precipitate the activated sludge.

[0021] Optionally, discharging a preset amount of supernatant from the reactor comprises:

[0022] 5 L of sewage supernatant was continuously discharged from the reactor within 25 min, so that the reactor contained 5 L of muddy water mixture.

[0023] Optionally, after continuously introducing oxygen into the sewage and continuously stirring the sewage, the sewage is allowed to stand, comprising:

[0024] After oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 20 min, the sewage was allowed to stand for 2 h.

[0025] Optionally, the denitrification and phosphorus removal process comprises:

[0026] Add 2 mL / L of trace element nutrient solution into the reactor;

[0027] The trace element nutrient solution is composed of: 1.25 g / L ferric chloride, 0.4 g / L copper sulfate, 1.27 g / L manganese chloride, 0.05 g / L sodium molybdate, 0.55 g / L zinc sulfate, 0.4 g / L cobalt chloride, 1.25 g / L ethylenediaminetetraacetic acid, 1.37 g / L calcium chloride and 44.4 g / L magnesium sulfide.

[0028] Another aspect of the present application provides a reactor, which is applied to the denitrification and phosphorus removal process provided in the present application, including a reaction container, a sewage tank, a carbon source tank, an inlet pump, an outlet pump, a carbon source pump, an air pump, an aeration head and a stirring device, wherein the aeration head is arranged in the reaction container, the stirring device is used to stir the mixture in the reaction container, the carbon source tank is connected to the reaction container through the carbon source pump, the sewage tank is connected to the reaction container through the inlet pump, the air pump is connected to the aeration head, and the outlet pump is connected to the reaction container.

[0029] Optionally, the reactor provided in the embodiment of the present application further includes a PLC control cabinet, and a DO sensor, an ORP sensor and a pH sensor, all of which are communicatively connected to the PLC control cabinet, the DO sensor, the ORP sensor and the pH sensor are all installed in the reaction container, and the water inlet pump, the water outlet pump, the carbon source pump, the air pump and the stirring device are all communicatively connected to the PLC control cabinet.

[0030] The technical solution provided by this application can achieve at least one of the following beneficial effects:

[0031] The denitrification and phosphorus removal process and reactor provided by the present application combine aerobic nitrification with aerobic phosphorus release in the aerobic section to achieve the simultaneous completion of the two paths of ammonia nitrogen removal and phosphorus release, fully utilize aeration, and do not need to perform the phosphorus release process in the anaerobic section, thereby reducing the cumbersomeness of sewage treatment operations; and, in the anoxic section, combine anoxic denitrification with denitrification phosphorus absorption, utilize the intermediate product of denitrification and the substance required for phosphorus removal to be the same substance, that is, the intermediate product of short-term nitrification is nitrite nitrogen and the electron acceptor of denitrification phosphorus removal is also nitrite nitrogen, combine short-term denitrification with denitrification phosphorus removal, achieve "one carbon for two uses" in the anoxic section, improve the utilization rate of carbon source in the sewage treatment process, avoid the need for additional carbon source addition in the anoxic section, and reduce the possibility of secondary pollution in the sewage treatment process; at the same time, shorten the denitrification and phosphorus removal path, combine aerobic nitrification with aerobic phosphorus release, and combine anoxic denitrification with phosphorus absorption, thereby effectively shortening the denitrification and phosphorus removal path.

[0032] The additional technical features and advantages of the present application will be more clearly explained in the following description, or can be understood through the specific practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present application, the following is a brief introduction to the drawings required for the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of a process for denitrification and dephosphorization according to an embodiment of the present application;

[0035] Figure 2 A graph showing changes in pollutants during a cycle of the denitrification and phosphorus removal process provided in an embodiment of the present application;

[0036] Figure 3 A diagram showing the long-term operation of the denitrification and phosphorus removal process provided in the embodiment of the present application;

[0037] Figure 4 A diagram showing the long-term operation of the TN treatment process for the denitrification and phosphorus removal process provided in the embodiment of the present application;

[0038] Figure 5 A schematic structural diagram of an implementation manner of a reactor provided in an example of the present application.

[0039] Reference numerals:

[0040] 01. PLC control cabinet; 02. Aeration head;

[0041] 03. Reaction vessel; 04. DO sensor;

[0042] 05. pH sensor; 06. ORP sensor;

[0043] 08. Stirring device; 09. Water outlet pump;

[0044] 10. Air pump; 11. Sewage tank;

[0045] 12. Water inlet pump; 13. Carbon source tank;

[0046] 14. Carbon source pump. DETAILED DESCRIPTION

[0047] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0048] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] like Figure 1 As shown, one aspect of the present application provides a denitrification and phosphorus removal process, comprising: continuously repeating multiple denitrification and phosphorus removal cycles, each of the denitrification and phosphorus removal cycles comprising:

[0051] Step 100: Add NH4 to the reactor + and PO4 3- of sewage;

[0052] Step 200: continuously introducing oxygen into the sewage and continuously stirring the sewage;

[0053] Step 300: Stop introducing oxygen into the sewage and stop stirring the sewage, and add a carbon source concentrate into the sewage;

[0054] Step 400: After continuously stirring the sewage for a preset period of time, the sewage is allowed to stand;

[0055] Step 500: discharging a preset amount of supernatant from the reactor;

[0056] Step 600: After continuously introducing oxygen into the sewage and continuously stirring the sewage, the sewage is allowed to stand.

[0057] In the embodiment of the present application, the multiple times are at least two times.

[0058] The denitrification and phosphorus removal process provided in the present application utilizes the short-range nitrification and denitrification (PND) and enhanced biological phosphorus removal (EBPR) processes. Specifically, the denitrification pathway of the short-range nitrification and denitrification process is to convert NH4 + -N is oxidized to NO2 - -N, and then enter the anoxic stage to complete NO2 - -N→N2 denitrification reaction. Compared with the traditional nitrification and denitrification process, the PND process eliminates NO3 - -N is produced in two repeated stages from NH4 + -N→NO2 - -N→NO3 - -N→NO2 - -N → N2 shortens to NH4 + -N→NO2 - -N→N2. Therefore, the PND process can reduce the aeration energy consumption in the nitrification stage and the carbon source addition in the denitrification stage. The core microorganisms of the enhanced biological phosphorus removal process are phosphate accumulating bacteria (PAOs). These bacteria release ploy-P in the microorganisms into the water body as PO4 under anaerobic conditions. 3- -P exists in water and converts PO4 3- -P is absorbed into the body. Through the two stages of anaerobic phosphorus release and aerobic excess phosphorus absorption, PO4 3--P is enriched in the activated sludge and then discharged from the system. The process of aerobic excessive phosphorus absorption requires the consumption of intracellular PHA, and the source of PHA is the volatile fatty acid (VFA) in the water during the anaerobic stage.

[0059] The denitrification and phosphorus removal process provided in this application can also be called a short-range nitrification and denitrification simultaneous denitrification and phosphorus removal process. The phosphorus removal path consists of two stages: phosphorus release in the aerobic stage and phosphorus absorption in the anoxic stage. In the aerobic stage, microorganisms absorb organic matter in the water body into their bodies to synthesize glycogen (Gly). The energy generated in this process is used to release PO4 in the cell body. 3- -P to the water body, so in an aerobic environment, PO4 3- -P concentration increases. In the anoxic period, microorganisms use NO 2- -N is an electron acceptor, using the Gly stored in the aerobic stage as energy and the COD in the water as a carbon source to absorb PO4 in the water 3- -P into the cell body. Aerobic phosphorus release and anoxic phosphorus uptake are a complete phosphorus removal process, and the purpose of removing phosphorus from sewage is finally achieved through the discharge of residual sludge. Therefore, under suitable conditions, the aerobic / anoxic process is repeated, which can combine the short-term nitrification and denitrification denitrification and aerobic phosphorus release / anoxic phosphorus uptake and phosphorus removal process, and finally achieve the purpose of two-stage synchronous denitrification and phosphorus removal.

[0060] The denitrification and phosphorus removal process provided by the present application combines aerobic nitrification with aerobic phosphorus release in the aerobic section to achieve the simultaneous completion of the two paths of ammonia nitrogen removal and phosphorus release, fully utilizes the aeration energy consumption, and does not need to perform the phosphorus release process in the anaerobic section, thereby reducing the cumbersomeness of sewage treatment operations; and, in the anoxic section, combines anoxic denitrification with denitrification phosphorus absorption, utilizes the same substance required for denitrification and phosphorus removal, that is, the intermediate product of short-term nitrification is nitrite nitrogen and the electron acceptor of denitrification phosphorus removal is also nitrite nitrogen, combines short-term denitrification with denitrification phosphorus removal, achieves "one carbon for two uses" in the anoxic section, improves the utilization rate of the carbon source in the sewage treatment process, avoids the need for additional carbon source addition in the anoxic section, and reduces the possibility of secondary pollution in the sewage treatment process; at the same time, shortens the denitrification and phosphorus removal path, combines aerobic nitrification with aerobic phosphorus release, and combines anoxic denitrification with phosphorus absorption, thereby effectively shortening the denitrification and phosphorus removal path.

[0061] Optionally, in step 100, the sewage further contains cobalt chloride (CoCl2), manganese chloride (MnCl2), ferrous sulfate (FeSO4) and ethylenediaminetetraacetic acid (EDTA).

[0062] Optionally, the step 100 includes:

[0063] 5L of sewage was continuously added to the reactor within 25min, and 10L of muddy water mixture was formed in the reactor, so that NH4 + The concentration is 50±1.2mg / L, PO4 3- The concentration is 5±0.5mg / L.

[0064] Optionally, the step 200 includes:

[0065] Oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 180 min.

[0066] In this stage, short-term nitrification and phosphorus release reactions are carried out, such as Figure 2 As shown in the figure, as the aerobic stage progresses, ammonia nitrogen is gradually oxidized to nitrite nitrogen. At this time, as nitrification progresses, the P concentration in the water gradually increases. The influent P concentration is 4.85 mg / L. After aerobic nitrification and phosphorus release, the P concentration in the aerobic stage reaches a maximum of 13.59 mg / L. Figure 2 It can be seen that the accumulation rate of nitrite nitrogen is good during this process, indicating that the PND process is effective.

[0067] Optionally, the step 300 includes:

[0068] 50 ml of carbon source concentrated solution was continuously introduced into the reactor within 10 minutes, and the pollutant content in the reactor was adjusted to C / N=3, wherein the carbon source concentrated solution was prepared with sodium acetate.

[0069] Optionally, the step 400 includes:

[0070] After continuously stirring the sewage for 30 minutes, the sewage was left to stand for 6 minutes to precipitate the activated sludge.

[0071] In this stage, anoxic denitrification and phosphorus absorption reactions occur, such as Figure 2 As shown in the figure, the concentration of nitrite nitrogen gradually decreases in the anoxic stage. At this time, the P concentration in the water body gradually decreases as denitrification proceeds. The initial P concentration in the anoxic stage is 12.14 mg / L. After anoxic denitrification and phosphorus absorption, the P concentration in the water body decreases to 0.48 mg / L at the end of the anoxic stage. Figure 2 It can be seen that the removal of nitrite nitrogen and P was good during this process, indicating that the DPR process was effective. The anoxic stage lasted for 30 minutes and the precipitation lasted for 6 minutes.

[0072] Optionally, the step 500 includes:

[0073] 5 L of sewage supernatant was continuously discharged from the reactor within 25 min, so that the reactor contained 5 L of muddy water mixture.

[0074] Optionally, the step 600 includes:

[0075] After oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 20 min, the sewage was allowed to stand for 2 h.

[0076] In the present embodiment, a complete cycle of operation is 8 hours, and 3 cycles are run every day. Figure 3 As shown. Figure 3 It can be seen that the maximum phosphorus release in the aerobic stage can reach 11.87 mg / L, the phosphorus removal effect is good, and the phosphorus removal rate can reach 95.67%. The TN removal rate can be stabilized at around 98.89%, the nitrite accumulation rate can be stabilized at more than 95%, and the NO2 - -N and NO3 - -N can be completely removed. The specific water discharge conditions are as follows Figure 3 and Figure 4 shown.

[0077] Optionally, the denitrification and dephosphorization process provided in the embodiment of the present application further includes:

[0078] Add 2 mL / L of trace element nutrient solution into the reactor;

[0079] The trace element nutrient solution is composed of: 1.25 g / L ferric chloride, 0.4 g / L copper sulfate, 1.27 g / L manganese chloride, 0.05 g / L sodium molybdate, 0.55 g / L zinc sulfate, 0.4 g / L cobalt chloride, 1.25 g / L ethylenediaminetetraacetic acid, 1.37 g / L calcium chloride and 44.4 g / L magnesium sulfide.

[0080] like Figure 5 As shown, another aspect of the present application provides a reactor, which is applied to the denitrification and phosphorus removal process provided in the embodiment of the present application, including a reaction vessel 03, a sewage tank 11, a carbon source tank 13, an inlet pump 12, an outlet pump 09, a carbon source pump 14, an air pump 10, an aeration head 02 and a stirring device 08, wherein the aeration head 02 is arranged in the reaction vessel 03, the stirring device 08 is used to stir the mixture in the reaction vessel 03, the carbon source tank 13 is connected to the reaction vessel 03 through the carbon source pump 14, the sewage tank 11 is connected to the reaction vessel 03 through the inlet pump 12, the air pump 10 is connected to the aeration head 02, and the outlet pump 09 is connected to the reaction vessel 03.

[0081] The reactor provided in the present application can carry out chemical reactions in the denitrification and dephosphorization process in the reaction vessel 03, add the carbon source concentrate to the reaction vessel 03 through the carbon source pump 14, send the sewage in the sewage tank 11 into the reaction vessel 03 through the sewage tank 11, introduce air into the reaction vessel 03 through the air pump 10 and the aeration head 02, stir the mixed liquid in the reaction vessel 03 through the stirring device 08, and discharge the mixture in the reaction vessel 03 through the outlet pump 09, so that the denitrification and dephosphorization process can proceed smoothly. The inlet pump 12, the outlet pump 09 and the carbon source pump 14 are preferably peristaltic pumps.

[0082] Optionally, the reactor provided in the embodiment of the present application further includes a PLC control cabinet 01, and a DO sensor 04, an ORP sensor 06 and a pH sensor 05, all of which are communicatively connected to the PLC control cabinet 01, the DO sensor 04, the ORP sensor 06 and the pH sensor 05 are all installed in the reaction container 03, and the water inlet pump 12, the water outlet pump 09, the carbon source pump 14, the air pump 10 and the stirring device 08 are all communicatively connected to the PLC control cabinet 01.

[0083] The reactor provided in the embodiment of the present application is preferably an SBR reactor made of plexiglass, with a volume of 12L and an effective working volume of 10L. The dimensions of the reactor are preferably: 40cm in height and 20cm in inner diameter. The reactor is preferably set with an exchange ratio of 0.5, and the inlet and outlet water are achieved through a peristaltic pump and a hose. An air pump 10 is used for aeration, and a mechanical agitator is configured in the reactor for aeration. The aeration volume of the aerobic stage is 0.7-1.0L / min, and the sludge age is 14d. The experiment completes real-time control by constructing an intelligent control system for biological denitrification of sewage that combines sensors with a PLC control cabinet 01, such as Figure 5 As shown, the DO sensor 04, ORP sensor 06 and pH sensor 05 are configured in the reactor and are connected to the PLC control cabinet 01. The intelligent control software for biological denitrification of sewage is used to monitor the changes in water parameters in real time. At the same time, a switch is provided on the PLC controller to control the water inlet, stirring, aeration, COD addition and drainage of the SBR through monitoring data.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A denitrification and dephosphorization process, characterized in that: include: Repeating multiple denitrification and phosphorus removal cycles, each of which includes: Add NH4 to the reactor + and PO4 3- of sewage; continuously introducing oxygen into the sewage and continuously stirring the sewage; Stop introducing oxygen into the sewage and stop stirring the sewage, and add a carbon source concentrate to the sewage; After continuously stirring the sewage for a preset period of time, the sewage is allowed to stand; discharging a predetermined amount of supernatant from the reactor; After continuously introducing oxygen into the sewage and continuously stirring the sewage, the sewage is left to stand.

2. The denitrification and phosphorus removal process according to claim 1, characterized in that: The NH4 is added into the reactor + and PO4 3- The sewage also contains cobalt chloride CoCl2, manganese chloride MnCl2, ferrous sulfate FeSO4 and ethylenediaminetetraacetic acid EDTA.

3. The denitrification and phosphorus removal process according to claim 1, characterized in that: The NH4 + and PO4 3- of sewage, including: 5L of sewage was continuously added to the reactor within 25min, and 10L of muddy water mixture was formed in the reactor, so that NH4 + The concentration is 50±1.2mg / L, PO4 3- The concentration is 5±0.5mg / L.

4. The denitrification and phosphorus removal process according to claim 1, characterized in that: Continuously introducing oxygen into the sewage and continuously stirring the sewage, comprising: Oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 180 min.

5. The denitrification and phosphorus removal process according to claim 1, characterized in that: Stopping the introduction of oxygen into the sewage and stopping stirring the sewage, and adding a carbon source concentrate to the sewage, comprising: 50 ml of carbon source concentrated solution was continuously introduced into the reactor within 10 minutes, and the pollutant content in the reactor was C / N=3, wherein the carbon source concentrated solution was prepared with sodium acetate.

6. The denitrification and phosphorus removal process according to claim 1, characterized in that: After continuously stirring the sewage for a preset period of time, the sewage is allowed to stand, including: After continuously stirring the sewage for 30 minutes, the sewage was left to stand for 6 minutes to precipitate the activated sludge.

7. The denitrification and phosphorus removal process according to claim 1, characterized in that: Discharging a predetermined amount of supernatant from the reactor comprises: 5 L of sewage supernatant was continuously discharged from the reactor within 25 min, so that the reactor contained 5 L of muddy water mixture.

8. The denitrification and phosphorus removal process according to claim 1, characterized in that: After continuously introducing oxygen into the sewage and continuously stirring the sewage, the sewage is allowed to stand, comprising: After oxygen was continuously introduced into the sewage at a flow rate of 0.7-1.0 L / min for 20 min, the sewage was allowed to stand for 2 h.

9. The denitrification and dephosphorization process according to any one of claims 1 to 8, characterized in that: include: Add 2 mL / L of trace element nutrient solution into the reactor; The trace element nutrient solution is composed of: 1.25 g / L ferric chloride, 0.4 g / L copper sulfate, 1.27 g / L manganese chloride, 0.05 g / L sodium molybdate, 0.55 g / L zinc sulfate, 0.4 g / L cobalt chloride, 1.25 g / L ethylenediaminetetraacetic acid, 1.37 g / L calcium chloride and 44.4 g / L magnesium sulfide.

10. A reactor, characterized in that The denitrification and phosphorus removal process applied to any one of claims 1 to 9 comprises a reaction vessel, a sewage tank, a carbon source tank, an inlet pump, an outlet pump, a carbon source pump, an air pump, an aeration head and a stirring device, wherein the aeration head is arranged in the reaction vessel, the stirring device is used to stir the mixture in the reaction vessel, the carbon source tank is connected to the reaction vessel through the carbon source pump, the sewage tank is connected to the reaction vessel through the inlet pump, the air pump is connected to the aeration head, and the outlet pump is connected to the reaction vessel; The reactor also includes a PLC control cabinet, and a DO sensor, an ORP sensor and a pH sensor which are all communicatively connected to the PLC control cabinet. The DO sensor, the ORP sensor and the pH sensor are all installed in the reaction container, and the water inlet pump, the water outlet pump, the carbon source pump, the air pump and the stirring device are all communicatively connected to the PLC control cabinet.

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