Anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying and anammox bacteria and method for operating the same

Abstract

The present application belongs to the technical field of domestic sewage treatment, and specifically discloses an anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying and anaerobic ammonia oxidation bacteria and a control method thereof. The system is used to solve the problem that anaerobic ammonia oxidation bacteria and sulfur-iron denitrifying bacteria are difficult to enrich. The present application controls the residence time of the anaerobic zone in real time, realizes sufficient storage of limited carbon source of raw water, monitors and controls the dissolved oxygen and the degree of nitrification of the aerobic zone, provides nitrite in the front anoxic zone through endogenous short-range denitrification, realizes enrichment of anaerobic ammonia oxidation bacteria, and produces nitrate which enters the rear anoxic zone and realizes enrichment of sulfur-iron denitrifying bacteria under the driving of sulfur-iron functional filter material. The present application realizes low-carbon deep denitrification of domestic sewage through cooperation of the front anoxic zone and the rear anoxic zone, monitors the concentration change of sulfide in the rear anoxic zone in real time, and realizes oxidation of sulfide to elemental sulfur through limited oxygen aeration, so as to realize recycling of the sulfur-iron functional filter material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of domestic sewage treatment, and particularly relates to an anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrification and anaerobic ammonia oxidation bacteria and a control method thereof. BACKGROUND

[0002] Anaerobic ammonia oxidation is a new type of autotrophic denitrification process, which can realize the simultaneous removal of ammonia nitrogen and nitrite under anoxic conditions without additional carbon source, but produces nitrate by-product, which limits the improvement of the denitrification efficiency of anaerobic ammonia oxidation. Sulfur-iron autotrophic denitrification uses reduced sulfur and iron as electron donors to achieve deep removal of nitrate without external carbon source, but has limited ability to remove ammonia nitrogen. If anaerobic ammonia oxidation and sulfur-iron autotrophic denitrification can be combined, low-carbon deep denitrification can be achieved, and the theoretical denitrification efficiency can reach 100%. SUMMARY

[0003] An object of the present application is to provide an anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrification and anaerobic ammonia oxidation bacteria, which effectively solves the problem that the bacterial flora of anaerobic ammonia oxidation bacteria and sulfur-iron denitrification bacteria is difficult to enrich.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] An anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrification and anaerobic ammonia oxidation bacteria, comprising a combined real-time monitoring control system, a dissolved oxygen real-time monitoring control system, a sulfide real-time monitoring control system, a water inlet unit, an anaerobic-aerobic-anoxic unit and a water outlet unit, the water inlet unit comprising a water inlet tank, a water inlet pipe and a water inlet pump, the anaerobic-aerobic-anoxic unit being a rectangular push-flow type continuous flow system, the anaerobic-aerobic-anoxic unit comprising an anaerobic zone, an aerobic zone, a front anoxic zone and a rear anoxic zone which are sequentially connected in the direction of water flow, and the water outlet unit comprising a water outlet pump and a water outlet tank.

[0006] The rear end of the anaerobic zone is provided with a COD monitoring probe, the front end of the aerobic zone is provided with a total nitrogen detection probe, and the rear end of the aerobic zone is provided with an ammonia nitrogen monitoring probe, and the water inlet pump, the COD monitoring probe, the total nitrogen detection probe and the ammonia nitrogen monitoring probe are connected with the combined real-time monitoring control system.

[0007] The aerobic zone is further provided with a dissolved oxygen monitoring probe and an aeration device, the aeration device comprising a gas flow meter for controlling the aeration amount, and the dissolved oxygen monitoring probe and the gas flow meter are connected with the dissolved oxygen real-time monitoring control system.

[0008] The anaerobic zone, the aerobic zone and the front anoxic zone are all provided with fixed filler balls, the rear anoxic zone is provided with sulfur-based filter material, iron-based filter material, sulfide monitoring probe and backwashing device, the backwashing device includes backwashing gas pump for controlling gas flow and backwashing water pump for controlling water quantity, and the sulfide monitoring probe, the backwashing gas pump and the backwashing water pump are all connected with the sulfide real-time monitoring control system.

[0009] Further, the volume ratio of the anaerobic zone, the aerobic zone, the front anoxic zone and the rear anoxic zone is 2:2:3:3.

[0010] Further, the sulfur-based filter material and the iron-based filter material are both spherical filter material with a diameter of 3-4mm, and the sulfur-based filter material and the iron-based filter material are mixed in a 4:1 mode and filled into the rear anoxic zone at a filling ratio of 100%.

[0011] Further, the aeration device further includes a blower and a microporous aeration disc, the outlet of the blower is connected with the inlet of a gas flow meter, the outlet of the gas flow meter is connected with the inlet of the microporous aeration disc, and the microporous aeration disc is arranged at the bottom of the aerobic zone.

[0012] Further, the backwashing device further includes a backwashing water tank, the outlet of the backwashing water tank is connected with the inlet of the backwashing water pump, and the outlet of the backwashing water pump and the outlet of the backwashing gas pump are both connected with the rear anoxic zone through a pipeline.

[0013] Further, the front end of the anaerobic zone is provided with a water inlet, the outlet of the water tank is connected with the inlet of a water pump, and the outlet of the water pump is connected with the water inlet through a water inlet pipe.

[0014] The upper part of the rear end of the rear anoxic zone is provided with a water outlet, the water outlet is connected with the inlet of a water pump through a first water outlet pipe, the outlet of the water pump is connected with the inlet of a water tank, and the water outlet is connected with the inlet of a backwashing water tank through a second water outlet pipe.

[0015] Another object of the present application is to provide a control method of the anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying bacteria and anaerobic ammonia oxidation bacteria as described in the above embodiments, which comprises the following steps: S1, the wastewater in the water tank is pumped into the anaerobic zone by a water pump, the organic carbon source in the wastewater is utilized by heterotrophic denitrifying bacteria to remove nitrate in the wastewater, the unused organic carbon source is stored as endogenous carbon source by endogenous denitrifying bacteria, the COD concentration at the rear end of the anaerobic zone is monitored in real time by a COD monitoring probe, when the COD concentration is >10mg / L, the water pump is controlled to reduce the water inflow by the combined real-time monitoring control system, and when the COD concentration is ≤10mg / L, the organic carbon source is effectively stored.

[0016] S2, then the sewage enters the aerobic zone, starts the aeration device to aerate, converts the ammonia nitrogen in the sewage into nitrate, the dissolved oxygen monitoring probe transmits the dissolved oxygen concentration to the dissolved oxygen real-time monitoring control system in real time, when the dissolved oxygen concentration is greater than 1.0 mg / L, the dissolved oxygen real-time monitoring control system controls the gas flow meter to reduce the gas flow; when the dissolved oxygen concentration is less than 1.0 mg / L, the dissolved oxygen real-time monitoring control system controls the gas flow meter to increase the gas flow, and finally makes the dissolved oxygen concentration in the aerobic zone stable at 0.8-1.0 mg / L.

[0017] The total nitrogen monitoring probe and the ammonia nitrogen monitoring probe transmit the monitoring data to the combined real-time monitoring control system in real time, assuming that the total nitrogen concentration monitored by the total nitrogen monitoring probe at the front end of the aerobic zone is a mg / L, and the ammonia nitrogen concentration monitored by the ammonia nitrogen monitoring probe at the rear end of the aerobic zone is b mg / L, when b / a>0.43, the combined real-time monitoring control system controls the water inlet pump to reduce the water inlet flow; when b / a<0.43, the combined real-time monitoring control system controls the water inlet pump to increase the water inlet flow, so as to ensure that the front anoxic zone is provided with ammonia nitrogen and nitrite.

[0018] S3, the sewage continues to push to the front anoxic zone, the endogenous denitrifying bacteria utilize the internal carbon source stored in the anaerobic zone to drive short-range denitrification to produce nitrite, and the ammonia nitrogen and the nitrite provide substrates for the anaerobic ammonia oxidation bacteria, so that the anaerobic ammonia oxidation bacteria are domesticated, and nitrate is also produced.

[0019] S4, the sewage enters the rear anoxic zone, and the nitrate produced in the front anoxic zone and the sulfur-based filter material and the iron-based filter material are used as the substrates of the sulfur-iron denitrifying bacteria, so that the sulfur-iron denitrifying bacteria are gradually enriched, and the residual nitrate is removed, so as to achieve deep denitrification.

[0020] The rear anoxic zone is subjected to sulfur-iron autotrophic denitrification to produce sulfate, so that the sulfate-reducing bacteria are enriched, part of the sulfate is reduced to sulfide, and the sulfide monitoring probe transmits the sulfide concentration in the rear anoxic zone to the sulfide real-time monitoring control system in real time, when the sulfide concentration is greater than 7 mg / L, the backwashing gas pump and the backwashing water pump are started, and the gas and water amounts are controlled to be 1000 mL / min and 500 mL / min respectively; when the sulfide concentration is less than or equal to 7 mg / L, the backwashing gas pump and the backwashing water pump are closed.

[0021] S5, finally, the treated sewage enters the effluent tank through the effluent pump.

[0022] Compared with the prior art, the beneficial technical effects of the present application are:

[0023] (1) The present application realizes the anaerobic ammonia oxidation and sulfur-iron autotrophic denitrification synergistic deep denitrification, the denitrification efficiency is higher than 95%, without adding external carbon source, the sludge production is reduced by 80%, and the electric energy consumption is reduced by 60%.

[0024] (2) According to the high and low load of the influent and the degree of nitrification, the present application controls the COD concentration in the anaerobic zone to be less than or equal to 10 mg / L and the ratio of the ammonia nitrogen concentration at the rear end of the aerobic zone to the total nitrogen concentration at the front end to be 0.43, so that the organic carbon source is effectively stored in the anaerobic zone and part of the nitrification is carried out in the aerobic zone, which provides the substrate for anaerobic ammonia oxidation, realizes in-situ enrichment of anaerobic ammonia oxidation bacteria, and the enrichment time is less than 60 days.

[0025] (3) Under the driving of the sulfur-iron functional filter material, combined with the limited oxygen aeration strategy, the present application realizes in-situ enrichment of sulfur-iron denitrifying bacteria and the enrichment time is less than 35 days, and at the same time, the oxidation of sulfide is realized, which reduces the concentration of sulfate by 80%, effectively realizes the recycling of sulfur source, and reduces the consumption of sulfur-iron source by 55%, saving the sulfur-iron source. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the connection structure of the anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying and anaerobic ammonia oxidation bacteria according to the present application.

[0027] Figure 2 is a system operation flow chart for realizing low-carbon denitrification according to the present application, wherein the solid line represents the running process and the dashed line represents the control process.

[0028] LIST OF REFERENCE NUMERALS: combined real-time monitoring control system-1; dissolved oxygen real-time monitoring control system-2; sulfide real-time monitoring control system-3; influent tank-4; influent pipe-5; influent pump-6; anaerobic zone-7; aerobic zone-8; front anoxic zone-9; rear anoxic zone-10; effluent pump-12; effluent tank-13; COD monitoring probe-14; total nitrogen detection probe-15; ammonia nitrogen monitoring probe-16; dissolved oxygen monitoring probe-17; air blower-18; microporous aeration disc-19; gas flow meter-20; fixed filler ball-21; sulfur-based filter material-22; iron-based filter material-23; sulfide monitoring probe-24; backwashing water tank-25; backwashing gas pump-26; backwashing water pump-27. DETAILED DESCRIPTION

[0029] Example 1: an anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying and anaerobic ammonia oxidation bacteria, as shown in Figure 1 the drawing, comprises a combined real-time monitoring control system 1, a dissolved oxygen real-time monitoring control system 2, a sulfide real-time monitoring control system 3, an influent unit, an anaerobic-aerobic-anoxic unit and an effluent unit. The influent unit comprises an influent tank 4, an influent pipe 5 and an influent pump 6. The anaerobic-aerobic-anoxic unit is a rectangular push-flow type continuous flow system. The anaerobic-aerobic-anoxic unit comprises an anaerobic zone 7, an aerobic zone 8, a front anoxic zone 9 and a rear anoxic zone 10 which are sequentially communicated in the water flow direction. The volume ratio of the anaerobic zone 7, the aerobic zone 8, the front anoxic zone 9 and the rear anoxic zone 10 is 2:2:3:3. The effluent unit comprises an effluent pump 12 and an effluent tank 13.

[0030] The front end of the anaerobic zone 7 is provided with a water inlet, the outlet of the water inlet tank 4 is connected with the inlet of the water inlet pump 6, the outlet of the water inlet pump 6 is connected with the water inlet through the water inlet pipe 5. The upper part of the rear end of the rear anoxic zone 10 is provided with a water outlet, the water outlet is connected with the inlet of the water outlet pump 12 through the first water outlet pipe, the outlet of the water outlet pump 12 is connected with the inlet of the water outlet tank 13.

[0031] The rear end of the anaerobic zone 7 is provided with a COD monitoring probe 14. The front end of the aerobic zone 8 is provided with a total nitrogen detection probe 15, and the rear end of the aerobic zone 8 is provided with an ammonia nitrogen monitoring probe 16. The water inlet pump 6, the COD monitoring probe 14, the total nitrogen detection probe 15 and the ammonia nitrogen monitoring probe 16 are all connected with the joint real-time monitoring control system 1.

[0032] The aerobic zone 8 is also provided with a dissolved oxygen monitoring probe 17 and an aeration device, the aeration device includes a blower 18, a microporous aeration disc 19 and a gas flow meter 20 for controlling the aeration amount. The outlet of the blower 18 is connected with the inlet of the gas flow meter 20, and the outlet of the gas flow meter 20 is connected with the inlet of the microporous aeration disc 19. The microporous aeration disc 19 is arranged at the bottom of the aerobic zone 8 to provide dissolved oxygen. The dissolved oxygen monitoring probe 17 and the gas flow meter 20 are both connected with the dissolved oxygen real-time monitoring control system 2.

[0033] The fixed filler balls 21 are uniformly arranged in the anaerobic zone 7, the aerobic zone 8 and the front anoxic zone 9, and the sulfur-based filter material 22 and the iron-based filter material 23 are arranged in the rear anoxic zone 10. The sulfur-based filter material 22 and the iron-based filter material 23 are both spherical filter materials with a diameter of 3-4 mm. The sulfur-based filter material 22 and the iron-based filter material 23 are mixed in a ratio of 4:1 and filled into the rear anoxic zone 10 at a filling ratio of 100%.

[0034] The rear anoxic zone 10 is also provided with a sulfide monitoring probe 24 and a backwashing device, the backwashing device includes a backwashing water tank 25, a backwashing gas pump 26 for controlling the gas flow and a backwashing water pump 27 for controlling the water amount. The water outlet is connected with the inlet of the backwashing water tank 25 through the second water outlet pipe, and the water for backwashing of the anaerobic-aerobic-anoxic system is generally the effluent of the anaerobic-aerobic-anoxic system. The outlet of the backwashing water tank 25 is connected with the inlet of the backwashing water pump 27, and the outlet of the backwashing water pump 27 and the outlet of the backwashing gas pump 26 are both connected to the rear anoxic zone 10 through a pipeline intersection, which can realize backwashing and limited oxygen aeration at the same time, and prevent the aeration amount from being too high. The sulfide monitoring probe 24, the backwashing gas pump 26 and the backwashing water pump 27 are all connected with the sulfide real-time monitoring control system 3.

[0035] Embodiment 2: This embodiment aims to determine the residence time and key control parameters of nitrification process of anaerobic zone 7 and aerobic zone 8 according to common low load and high load domestic sewage water quality, to realize stable supply of nitrite in the pre-anoxic zone 9, and then realize rapid enrichment of anaerobic ammonia oxidation bacteria. Through the sulfur-iron functional filter material, the sulfur-iron denitrifying bacteria are enriched in situ in the post-anoxic zone 10, realizing the cooperation of sulfur-iron autotrophic denitrification and anaerobic ammonia oxidation for deep nitrogen removal. Through limited oxygen aeration, the sulfide produced by sulfate reducing bacteria is converted into elemental sulfur, providing electrons in a cycle, reducing the consumption of sulfur-iron functional filter material, and realizing the enrichment of sulfur-iron denitrifying bacteria and its functional cooperation with sulfate reducing bacteria.

[0036] Specifically, a method for operating an anaerobic-aerobic-anoxic system for in-situ enrichment of sulfur-iron denitrifying and anaerobic ammonia oxidation bacteria as described in embodiment 1, the anaerobic-aerobic-anoxic system provided in this embodiment can be started by inoculating the excess sludge in the secondary sedimentation tank of a municipal wastewater treatment plant, and low-load or high-load domestic sewage is used as the influent, mainly containing COD (100-400 mg / L), ammonia nitrogen (20-120 mg / L) and total nitrogen (30-130 mg / L).

[0037] As shown in Figure 2 , the method comprises the following steps: (1) the wastewater in the water inlet tank 4 is pumped into the anaerobic zone 7 by the water inlet pump 6, the organic carbon source in the wastewater can be utilized by heterotrophic denitrifying bacteria to remove nitrate in the wastewater, and the unused organic carbon source can be stored as internal carbon source by endogenous denitrifying bacteria. The COD monitoring probe 14 monitors the COD concentration at the rear end of the anaerobic zone 7 in real time. When the COD concentration is > 10 mg / L, the combined real-time monitoring control system 1 controls the water inlet pump 6 to reduce the water inlet flow; when the COD concentration is ≤ 10 mg / L, the organic carbon source is effectively stored.

[0038] (2) Then the wastewater enters the aerobic zone 8, the air blower 18 is started, and aeration is carried out to convert ammonia nitrogen in the wastewater into nitrate, and the dissolved oxygen monitoring probe 17 transmits the dissolved oxygen concentration to the dissolved oxygen real-time monitoring control system 2 in real time. When the dissolved oxygen concentration is > 1.0 mg / L, the dissolved oxygen real-time monitoring control system 2 controls the gas flow meter 20 to reduce the gas flow; when the dissolved oxygen concentration is < 1.0 mg / L, the dissolved oxygen real-time monitoring control system 2 controls the gas flow meter 20 to increase the gas flow, and finally makes the dissolved oxygen concentration in the aerobic zone 8 stable at 0.8-1.0 mg / L.

[0039] The total nitrogen monitoring probe 15 at the front end of the aerobic zone 8 and the ammonia nitrogen monitoring probe 16 at the rear end of the aerobic zone 8 transmit monitoring data to the joint real-time monitoring control system 1 in real time. Assuming that the concentration of total nitrogen at the front end of the aerobic zone 8 monitored by the total nitrogen monitoring probe 15 is a mg / L, and the concentration of ammonia nitrogen at the rear end of the aerobic zone 8 monitored by the ammonia nitrogen monitoring probe 16 is b mg / L, when b / a>0.43, the joint real-time monitoring control system 1 controls the influent pump 6 to reduce the influent flow rate; when b / a<0.43, the joint real-time monitoring control system 1 controls the influent pump 6 to increase the influent flow rate, so as to ensure that ammonia nitrogen and nitrite are provided for the front anoxic zone 9.

[0040] (3) The wastewater continues to be pushed to the front anoxic zone 9, and the endogenous denitrifying bacteria utilize the internal carbon source stored in the anaerobic zone 7 to drive short-cut denitrification to produce nitrite, and the ammonia nitrogen and the nitrite can provide substrates for the anaerobic ammonia oxidation bacteria, so as to domesticate the anaerobic ammonia oxidation bacteria, and nitrate is also produced at the same time.

[0041] (4) The wastewater enters the rear anoxic zone 10, and the nitrate produced in the front anoxic zone 9 and the sulfur-based filter material and the iron-based filter material can be used as substrates for the sulfur-iron denitrifying bacteria, so that the sulfur-iron denitrifying bacteria are gradually enriched, so as to remove the residual nitrate, thereby achieving deep denitrification.

[0042] The rear anoxic zone 10 produces sulfate (90-120 mg / L) through sulfur-iron autotrophic denitrification, so that the sulfate-reducing bacteria are enriched, and part of the sulfate is reduced to sulfide (5-20 mg / L). The sulfide monitoring probe 24 transmits the sulfide concentration of the rear anoxic zone 10 to the sulfide real-time monitoring control system 3 in real time. When the sulfide concentration is >7 mg / L, the backwashing gas pump 26 and the backwashing water pump 27 are started, and the gas flow rate and the water flow rate are controlled to be 1000 mL / min and 500 mL / min respectively, so that the sulfide is oxidized to elemental sulfur, thereby promoting the continuous progress of the sulfate reduction process and providing a sulfur source for the sulfur-iron autotrophic denitrification to reduce the consumption of the sulfur-iron functional filter material. When the sulfide concentration is ≤7 mg / L, the backwashing gas pump 26 and the backwashing water pump 27 are closed.

[0043] (5) Finally, the treated wastewater enters the effluent tank 13 through the effluent pump 12.

[0044] The embodiment realizes the synergistic deep denitrification of anaerobic ammonia oxidation and sulfur-iron autotrophic denitrification, the denitrification efficiency is higher than 95%, external carbon source addition is not required, the sludge production is reduced by 80%, and the electric energy consumption is reduced by 60%.

[0045] According to the high and low load of the influent and the degree of nitrification, the embodiment controls the COD concentration of the anaerobic zone to be less than or equal to 10 mg / L and the ratio of the ammonia nitrogen concentration at the rear end of the aerobic zone to the total nitrogen concentration at the front end to be 0.43, so that the organic carbon source is effectively stored in the anaerobic zone and part of the nitrification is in the aerobic zone, the substrate for anaerobic ammonia oxidation is provided, the anaerobic ammonia oxidation bacteria are enriched in situ, and the enrichment time is less than 60 days.

[0046] In the embodiment, under the driving of the sulfur-iron functional filter material, in combination with the limited oxygen aeration strategy, the sulfur-iron denitrifying bacteria are enriched in situ, the enrichment time is less than 35 days, sulfide oxidation is realized, the sulfate concentration is reduced by 80%, the recycling of the sulfur source is effectively realized, the consumption of the sulfur-iron source is reduced by 55%, and the sulfur-iron source is saved.

[0047] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A method for the manipulation of an anaerobic-aerobic-anoxic system for in situ enrichment of sulphide-iron denitrifying and ANAMMOX bacteria, characterized in that, The anaerobic-aerobic-anoxic system comprises a combined real-time monitoring control system, a dissolved oxygen real-time monitoring control system, a sulfide real-time monitoring control system, a water inlet unit, an anaerobic-aerobic-anoxic unit and a water outlet unit, the water inlet unit comprises a water inlet tank, a water inlet pipe and a water inlet pump, the anaerobic-aerobic-anoxic unit is a cuboid push-flow type continuous flow system, the anaerobic-aerobic-anoxic unit comprises an anaerobic zone, an aerobic zone, a front anoxic zone and a rear anoxic zone which are sequentially communicated in the water flow direction, and the water outlet unit comprises a water outlet pump and a water outlet tank; The rear end of the anaerobic zone is provided with a COD monitoring probe, the front end of the aerobic zone is provided with a total nitrogen detection probe, and the rear end of the aerobic zone is provided with an ammonia nitrogen monitoring probe, and the water inlet pump, the COD monitoring probe, the total nitrogen detection probe and the ammonia nitrogen monitoring probe are connected with the combined real-time monitoring control system; The aerobic zone is further provided with a dissolved oxygen monitoring probe and an aeration device, the aeration device comprises a gas flow meter for controlling the aeration amount, and the dissolved oxygen monitoring probe and the gas flow meter are connected with the dissolved oxygen real-time monitoring control system; The anaerobic zone, the aerobic zone and the front anoxic zone are all provided with fixed filler balls, the rear anoxic zone is provided with sulfur-based filter material, iron-based filter material, a sulfide monitoring probe and a backwashing device, the backwashing device comprises a backwashing gas pump for controlling the gas flow and a backwashing water pump for controlling the water amount, and the sulfide monitoring probe, the backwashing gas pump and the backwashing water pump are connected with the sulfide real-time monitoring control system; The control method comprises the following steps: S1, the sewage in the water inlet tank is pumped into the anaerobic zone by the water inlet pump, the organic carbon source in the sewage is utilized by the heterotrophic denitrifying bacteria to remove the nitrate in the sewage, the organic carbon source which is not utilized is stored as an internal carbon source by the endogenous denitrifying bacteria, the COD monitoring probe performs real-time monitoring on the COD concentration at the rear end of the anaerobic zone, when the COD concentration is greater than 10 mg / L, the combined real-time monitoring control system controls the water inlet pump to reduce the water inlet flow, and when the COD concentration is less than or equal to 10 mg / L, the organic carbon source is effectively stored; S2, then the sewage enters the aerobic zone, the aeration device is started to perform aeration, the ammonia nitrogen in the sewage is converted into nitrate, the dissolved oxygen concentration is transmitted to the dissolved oxygen real-time monitoring control system in real time by the dissolved oxygen monitoring probe, when the dissolved oxygen concentration is greater than 1.0 mg / L, the dissolved oxygen real-time monitoring control system controls the gas flow meter to reduce the gas flow, and when the dissolved oxygen concentration is less than 1.0 mg / L, the dissolved oxygen real-time monitoring control system controls the gas flow meter to increase the gas flow, and finally the dissolved oxygen concentration in the aerobic zone is stabilized at 0.8-1.0 mg / L. The total nitrogen monitoring probe and the ammonia nitrogen monitoring probe transmit monitoring data to the joint real-time monitoring control system in real time. Assuming that the concentration of total nitrogen at the front end of the aerobic zone monitored by the total nitrogen monitoring probe is a mg / L, and the concentration of ammonia nitrogen at the rear end of the aerobic zone monitored by the ammonia nitrogen monitoring probe is b mg / L, when b / a>0.43, the joint real-time monitoring control system controls the influent pump to reduce the influent flow; when b / a<0.43, the joint real-time monitoring control system controls the influent pump to increase the influent flow, so as to ensure that ammonia nitrogen and nitrite are provided for the front anoxic zone; S3, the sewage continues to flow to the front anoxic zone, the endogenous denitrifying bacteria utilize the internal carbon source stored in the anaerobic zone to drive short-cut denitrification to produce nitrite, and the ammonia nitrogen and the nitrite provide substrates for the anammox bacteria, so that the anammox bacteria are domesticated, and nitrate is produced at the same time; S4, the sewage enters the rear anoxic zone, the nitrate produced in the front anoxic zone and the sulfur-based filter material and the iron-based filter material are used as substrates for the sulfur-iron denitrifying bacteria, and the sulfur-iron denitrifying bacteria are gradually enriched to remove residual nitrate, so as to achieve deep denitrification; The rear anoxic zone is subjected to sulfur-iron autotrophic denitrification to produce sulfate, so that the sulfate-reducing bacteria are enriched, part of the sulfate is reduced to sulfide, and the sulfide monitoring probe transmits the concentration of sulfide in the rear anoxic zone to the sulfide real-time monitoring control system in real time; when the sulfide concentration is greater than 7 mg / L, the backwashing air pump and the backwashing water pump are started, and the gas amount and the water amount are controlled to be 1000 mL / min and 500 mL / min respectively; when the sulfide concentration is less than or equal to 7 mg / L, the backwashing air pump and the backwashing water pump are closed; S5, finally, the treated sewage enters the effluent tank through the effluent pump.

2. The method for managing an anaerobic-aerobic-anoxic system for in situ enrichment of iron-sulfur reverse denitrifying and ANAMMOX bacteria according to claim 1, characterized in that, The volume ratio of the anaerobic zone, the aerobic zone, the front anoxic zone and the rear anoxic zone is 2:2:3:

3.

3. The method for the manipulation of an anaerobic-aerobic-anoxic system for in situ enrichment of iron-sulfur reverse denitrifying and ANAMMOX bacteria according to claim 2, characterized in that, The sulfur-based filter material and the iron-based filter material are both spherical filter materials with a diameter of 3-4 mm, and the sulfur-based filter material and the iron-based filter material are mixed in a ratio of 4:1 and filled into the rear anoxic zone at a filling ratio of 100%.

4. The method for managing an anaerobic-aerobic-anoxic system for in situ enrichment of iron-sulfur reverse denitrifying and ANAMMOX bacteria according to claim 3, characterized in that, The aeration device further comprises a blower and a microporous aeration disc, the outlet of the blower is connected with the inlet of a gas flow meter, the outlet of the gas flow meter is connected with the inlet of the microporous aeration disc, and the microporous aeration disc is arranged at the bottom of the aerobic zone.

5. The method for managing an anaerobic-aerobic-anoxic system for in situ enrichment of iron-sulfur reverse denitrifying and ANAMMOX bacteria according to claim 4, characterized in that, The backwashing device further comprises a backwashing water tank, the outlet of the backwashing water tank is connected with the inlet of the backwashing water pump, and the outlet of the backwashing water pump and the outlet of the backwashing air pump are both connected to the rear anoxic zone through a pipeline intersection.

6. The method for managing an anaerobic-aerobic-anoxic system for in situ enrichment of iron-sulfur reverse denitrifying and ANAMMOX bacteria according to claim 5, characterized in that, The front end of the anaerobic zone is provided with an influent port, the outlet of the influent tank is connected with the inlet of the influent pump, and the outlet of the influent pump is connected with the influent port through an influent pipe; The upper part of the rear end of the rear anoxic zone is provided with an effluent port, the effluent port is connected with the inlet of the effluent pump through a first effluent pipe, the outlet of the effluent pump is connected with the inlet of the effluent tank, and the effluent port is connected with the inlet of the backwashing water tank through a second effluent pipe.

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