A device and method for realizing simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater by using sulfur autotrophic denitrification technology

Abstract

The device and method for realizing simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater by using sulfur autotrophic denitrification technology belong to the technical field of biological deodorization and wastewater treatment. The device is mainly composed of a water tank, a sequencing batch reactor (SBR), a washing tower, a water pump, a fan and the like connected in sequence. The method is that the discharged hydrogen sulfide waste gas enters the washing tower, is contacted with and absorbed by the circulating absorption liquid to form a mixed liquid mainly containing S 2‑ and S 0 . The mixed liquid and the nitrate wastewater (or the secondary effluent of a municipal wastewater treatment plant mainly containing nitrate nitrogen) enter the SBR reactor, and the reduced sulfur (S 2‑ and S 0 in the mixed liquid mainly acts as an electron donor to realize autotrophic denitrification through the sulfur autotrophic denitrification pathway. The present application finally realizes the economic and efficient simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater, and provides a brand-new idea for the combination of biological deodorization and deep denitrification of municipal wastewater.

Description

Technical Field

[0001] This invention belongs to the field of biological deodorization and wastewater treatment technology, specifically involving an apparatus and method for simultaneously removing reducing sulfides and nitrogen from urban wastewater using sulfur autotrophic denitrification technology. Background Technology

[0002] Nitrogenous pollutants remain one of the major aquatic environmental and ecological problems. Excessive discharge of nitrogenous wastewater into water bodies can cause eutrophication, leading to algal blooms or red tides, causing the death of aquatic organisms, and damaging biodiversity. Currently, various water treatment denitrification technologies have emerged, mainly including physical, chemical, and biological methods. Biological denitrification is a crucial means of wastewater nitrogen removal, and most currently operating wastewater treatment plants employ traditional nitrification-denitrification biological denitrification technologies, with denitrification being a key component. However, urban wastewater in my country has a relatively low C / N ratio, requiring a sufficient carbon source to achieve good denitrification results during the denitrification process. Adding an external carbon source not only increases costs but may also cause secondary pollution. Therefore, autotrophic denitrification technology, which does not require an external carbon source, is playing an increasingly important role in water pollution control.

[0003] In recent years, due to continuous urban development and the reduction of land resources, urban sewage treatment plants have been located closer and closer to residential areas. The odorous gases emitted during sewage treatment have inevitably become a major source of urban odor pollution. The main odor-causing components are sulfur-containing compounds, such as hydrogen sulfide and methanethiol. Therefore, the removal of odorous gases, especially sulfur-containing compounds, is imperative.

[0004] In wastewater denitrification research, autotrophic denitrification processes are quite common. Sulfur autotrophic denitrification refers to the process by which denitrifying bacteria (Thiobacillus denitrifications, etc.) utilize reduced sulfur (S) under anoxic or anaerobic conditions. 0 S 2- SO3 2- S2O3 2- (etc.) as electron donors, with NO3 - -N or NO2 - -N acts as an electron acceptor and gains energy through the oxidation of reduced sulfur, converting NO3- into NO3-. - The process of reducing NO3- to N2 has advantages including no need for an external carbon source and low sludge production, and is effective in treating NO3-containing sludge. - -N inorganic wastewater has the advantage of cost reduction. In terms of deodorization technology, biological treatment technology has become the most ideal technology for odor gas treatment due to its advantages such as not producing secondary pollution, low operating costs, low infrastructure equipment costs, and long-term stable operation.

[0005] This invention fully integrates biological deodorization with sulfur autotrophic denitrification technology, achieving economical and efficient removal of nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant) and hydrogen sulfide waste gas through the construction of a novel biological scrubbing tower system. Flocculent sludge, with sulfur-oxidizing bacteria as the main functional bacteria, serves as the circulating absorbent in the scrubbing tower, converting the hydrogen sulfide waste gas entering the tower into sulfur-containing waste gas. 2- and S 0 The mixture is mainly composed of nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant). This mixture enters the SBR reactor together with nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant), and the reduced sulfur (S) in the mixture is used as the solvent. 2- and S 0 Using sulfur as the primary electron donor, autotrophic denitrification is achieved through sulfur autotrophic denitrification. This ultimately enables the economical and efficient simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater, providing a novel approach and method for combining biological deodorization and advanced wastewater treatment. Summary of the Invention

[0006] A device for the simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology is characterized in that: the device includes a raw water tank (1), a first inlet pump (2), a sequencing batch reactor (SBR) (3), a stirrer (4), a pH / DO real-time monitoring device (5), polyethylene packing material inoculated with sulfur autotrophic denitrifying bacteria (6), a second inlet pump (7), a first circulating liquid pump (8), an intermediate regulating water tank (9), a second circulating liquid pump (10), an outlet valve (11), a scrubbing tower (12), a spray water distributor (13), a blower (14), and a flow meter (15).

[0007] The raw water tank (1) is connected to the sequencing batch reactor (3) via the first inlet pump (2). The sequencing batch reactor (3) is equipped with a stirrer (4) and a real-time pH / DO monitoring device (5) to monitor the dissolved oxygen and pH of the sequencing batch reactor (3). Polyethylene packing material (6) inoculated with sulfur autotrophic denitrifying bacteria is added to the sequencing batch reactor (3). The sequencing batch reactor (3) is connected to the spray distributor (13) at the top of the scrubbing tower (12) via the first circulating liquid pump (8). The bottom of the scrubbing tower (12) is connected to the intermediate regulating water tank (9). The intermediate regulating water tank (9) is connected to the sequencing batch reactor (3) via the second inlet pump (7) and to the spray distributor (13) at the top of the scrubbing tower (12) via the second circulating liquid pump (10). The blower (14) is connected to the bottom of the scrubbing tower (12) via the flow meter (15) and blows hydrogen sulfide waste gas into it. An outlet valve (11) is installed in the outlet pipeline of the sequencing batch reactor (3) for draining the supernatant of the sequencing batch reactor (3).

[0008] A method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology includes the following steps:

[0009] 1) Acclimation and biofilm formation of sulfur autotrophic denitrifying bacteria: After shutting off the second influent pump (7) and the first circulating liquid pump (8), polyethylene packing was added to the SBR at room temperature with a filling ratio of 40-50%. Sludge from an actual urban wastewater treatment plant was used as inoculum sludge and introduced into the SBR for acclimation and biofilm formation. Sodium sulfide and nitrate nitrogen were mixed as the substrate mixture for acclimating sulfur autotrophic denitrifying bacteria. The substrate mixture contained NO3... - The nitrogen concentration was 50–60 mg / L, and the sulfur-to-nitrogen (S / N) mass ratio was 1.5–2. The mixed solution was pumped into the SBR. Simultaneously, a nutrient solution with specific components and trace elements was prepared to ensure normal physiological activity of the microorganisms. During the acclimation process, three cycles were run daily. Each cycle included 10 minutes of influent, 5–6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of effluent discharge, and 70–130 minutes of idle time, with a effluent ratio of 50%. The sludge concentration after inoculation was maintained at 4000–5000 mg / L until the nitrate nitrogen removal rate stabilized above 80%, thus completing the acclimation and biofilm formation of the sulfur-autotrophic denitrifying bacteria. The acclimation and biofilm formation treatment time was 25–35 days. The components of the above-mentioned nutrient solution mother liquor are: 60g / L MgSO4·7H2O, 100g / L KHCO3, 36g / L CaCl2·2H2O, and 5.44g / L KH2PO4; the components of the trace element 1 mother liquor are: 6.39g / L EDTA·2Na and 9.14g / L FeSO4·7H2O; the components of the trace element 2 mother liquor are: 19.11g / L EDTA·2Na, 0.014g / L H3BO4, 0.43g / L ZnSO4·7H2O, 0.24g / L CoCl2·6H2O, 0.99g / L MnCl2·4H2O, 0.25g / L CuSO4·5H2O, 0.19g / L NiCl2·6H2O, and 0.22g / L NaMoO4·2H2O. The nutrient solution mother liquor was added at a rate of 5 mL / L wastewater, and trace element 1 and trace element 2 were added at a rate of 1 mL / L wastewater.

[0010] 2) Inoculation and acclimatization of sulfur-oxidizing bacteria: Keep the second influent pump (7) and the first circulating liquid pump (8) in the off state. Under room temperature conditions, inoculate the intermediate regulating tank with sludge from the actual urban sewage treatment plant. The inoculation concentration is maintained at 3000-3500 mg / L. Add an extra air pump to pump air into the intermediate regulating tank to maintain the dissolved oxygen in the intermediate regulating tank at 3 mg / L-5 mg / L. Use a blower to blow hydrogen sulfide exhaust gas into the air inlet at the bottom of the scrubbing tower. The flocculent sludge in the intermediate regulating tank enters the scrubbing tower through a peristaltic pump to contact with hydrogen sulfide and absorb and degrade it. During the acclimatization process, run four cycles a day. Each cycle includes 10 min of influent (using the effluent from the actual domestic sewage treatment plant as the system influent), 4.5-5 h of aeration, 0.5 h of sedimentation, 10 min of drainage, and 10-40 min of idle time. The drainage ratio is 60%. The inoculation and acclimatization of sulfur-oxidizing bacteria is completed when the hydrogen sulfide removal rate is stable at more than 80%. The acclimatization period is 10 to 15 days.

[0011] 3) Start-up and operation of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: Turn off the second inlet pump (7) and the first circulating liquid pump (8), and remove the air pump added to the intermediate regulating tank. Retain the biofilm system that has been acclimated in the SBR, discharge all the flocculent sludge in the SBR, and add all the acclimated flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria in the intermediate regulating tank into the SBR to establish a sludge film system with flocculent sludge mainly composed of sulfur-oxidizing bacteria and biofilm mainly composed of sulfur autotrophic denitrifying bacteria. Use the flocculent sludge as the circulating absorbent in the scrubbing tower, and under the action of sulfur-oxidizing bacteria, convert most of the hydrogen sulfide waste gas into sulfur. 2- Elemental sulfur may enter the SBR; sulfur-autotrophic denitrifying bacteria in the SBR use sulfur as fuel. 2- S 0The SBR system uses reduced sulfur as an electron donor to reduce nitrates to nitrogen. The SBR system operates in three cycles per day, each cycle including 10 minutes of influent, 5-6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, and 70-130 minutes of idle time, with a drainage ratio of 50%. The scrubbing tower is kept running continuously for 24 hours. The circulating absorbent in the scrubbing tower is divided into two circulation paths according to the different cycle operation states of the SBR system: When the SBR is in the anoxic stirring stage, the flocculent sludge can be used as the circulating absorbent and passes through the SBR (3), the first circulating liquid pump (8), the spray distributor (13), the scrubbing tower (12), the intermediate regulating water tank (9), and the second influent pump (7) in sequence, and finally flows back into the SBR (3). During this process, the second circulating liquid pump (10) is in the off state; when the SBR is in the influent, sedimentation, drainage and idle stages, the sludge can be used as the circulating absorbent and passes through the SBR (3), the first circulating liquid pump (8), the spray distributor (13), the scrubbing tower (12), the intermediate regulating water tank (9), and the second influent pump (7), and finally flows back into the SBR (3). During this process, the second circulating liquid pump (10) is in the off state. During this period, the flocculent sludge in the SBR cannot be used as circulating absorbent to enter the scrubbing tower. To ensure the 24-hour operation of the scrubbing tower, the flocculent sludge in the intermediate regulating water tank is used as circulating absorbent and passes through the intermediate regulating water tank (9), the second circulating liquid pump (10), the spray water distributor (13), the scrubbing tower (12) in sequence, and finally flows back into the intermediate regulating water tank (9). During this process, the second inlet pump (7) and the first circulating liquid pump (8) are in the off state; thus, efficient and synchronous removal of hydrogen sulfide waste gas and nitrate wastewater is achieved.

[0012] 4) Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: During system operation, as flocculent sludge, mainly composed of sulfur-oxidizing bacteria, grows, S... 2- and S 0 The accumulation rate gradually decreases, leading to a decrease in nitrate nitrogen removal rate. When the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging flocculent sludge from the SBR, maintaining the flocculent sludge concentration in the SBR at 1000–1100 mg / L to stabilize the sulfur content. 2- and S 0 The substrate supply is controlled by adding Na2CO3 or NaOH during system startup and operation to maintain the pH at 7–8.5.

[0013] In summary, this invention fully integrates biological deodorization with sulfur autotrophic denitrification technology, achieving economical and efficient removal of nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant) and hydrogen sulfide waste gas through the construction of a novel biological scrubbing tower system. Flocculent sludge, with sulfur-oxidizing bacteria as the main functional bacteria, serves as the circulating absorbent in the scrubbing tower, converting the hydrogen sulfide waste gas entering the scrubbing tower into sulfur-containing waste gas. 2- and S 0 The mixture is mainly composed of nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant). This mixture enters the SBR reactor together with nitrate wastewater (or secondary effluent from municipal wastewater treatment plants with nitrate nitrogen as the main pollutant), and the reduced sulfur (S) in the mixture is used as the solvent.2- and S 0 Using sulfur as the primary electron donor, autotrophic denitrification is achieved through sulfur autotrophic denitrification. This invention provides a biological denitrification and deodorization treatment device and method that treats waste without the need for additional organic carbon sources. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a device that uses sulfur autotrophic denitrification technology to simultaneously remove hydrogen sulfide waste gas and nitrate wastewater.

[0015] Figure 1 In the middle: (1) raw water tank, (2) first inlet pump, (3) sequencing batch reactor (SBR), (4) stirrer, (5) pH / DO real-time monitoring device, (6) polyethylene packing inoculated with sulfur autotrophic denitrifying bacteria, (7) second inlet pump, (8) first circulating liquid pump, (9) intermediate regulating water tank, (10) second circulating liquid pump, (11) outlet valve, (12) scrubbing tower, (13) spray water distributor, (14) blower, (15) flow meter. Detailed Implementation

[0016] Experimental system diagram as follows Figure 1 As shown, all reactors are made of plexiglass. The SBR reactor (3) has a total volume of 11L and an effective volume of 10L; the scrubbing tower has a total volume of 5.2L; and the intermediate equalization tank has a volume of 2L and an effective volume of 1.8L. During the experiment, NO3 was introduced into the influent. - -N concentration 40–60 mg / L, H2S inlet concentration 400–600 mg / m³ 3 The gas flow rate is 5 L / min.

[0017] To make the implementation method of the present invention clearer, the invention will be further described in detail with reference to the accompanying drawings and specific embodiments: A device for the simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology is characterized in that: the device includes a raw water tank (1), a first inlet pump (2), a sequencing batch reactor (SBR) (3), a stirrer (4), a pH / DO real-time monitoring device (5), polyethylene packing material inoculated with sulfur autotrophic denitrifying bacteria (6), a second inlet pump (7), a first circulating liquid pump (8), an intermediate regulating water tank (9), a second circulating liquid pump (10), an outlet valve (11), a scrubbing tower (12), a spray water distributor (13), a blower (14), and a flow meter (15).

[0018] The raw water tank (1) is connected to the sequencing batch reactor (3) via the first inlet pump (2). The sequencing batch reactor (3) is equipped with a stirrer (4) and a real-time pH / DO monitoring device (5) to monitor the dissolved oxygen and pH of the sequencing batch reactor (3). Polyethylene packing material (6) inoculated with sulfur autotrophic denitrifying bacteria is added to the sequencing batch reactor (3). The sequencing batch reactor (3) is connected to the spray distributor (13) at the top of the scrubbing tower (12) via the first circulating liquid pump (8). The bottom of the scrubbing tower (12) is connected to the intermediate regulating water tank (9). The intermediate regulating water tank (9) is connected to the sequencing batch reactor (3) via the second inlet pump (7) and to the spray distributor (13) at the top of the scrubbing tower (12) via the second circulating liquid pump (10). The blower (14) is connected to the bottom of the scrubbing tower (12) via the flow meter (15) and blows hydrogen sulfide waste gas into it. An outlet valve (11) is installed in the outlet pipeline of the sequencing batch reactor (3) for draining the supernatant of the sequencing batch reactor (3).

[0019] A method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology includes the following steps:

[0020] Acclimation and biofilm formation of sulfur autotrophic denitrifying bacteria: The second influent pump (7) and the first circulating liquid pump (8) were shut off. At room temperature, polyethylene packing material was added to the SBR at a filling ratio of 40-50%. Sludge from an actual urban wastewater treatment plant was used as inoculum sludge and introduced into the SBR for acclimation and biofilm formation. Sodium sulfide and nitrate nitrogen were mixed as the substrate mixture for acclimating sulfur autotrophic denitrifying bacteria. The substrate mixture contained NO3... -The nitrogen concentration was 50–60 mg / L, and the sulfur-to-nitrogen (S / N) mass ratio was 1.5–2. The mixed solution was pumped into the SBR. Simultaneously, a nutrient solution with specific components and trace elements was prepared to ensure normal physiological activity of the microorganisms. During the acclimation process, three cycles were run daily. Each cycle included 10 minutes of influent, 5–6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of effluent discharge, and 70–130 minutes of idle time, with a effluent ratio of 50%. The sludge concentration after inoculation was maintained at 4000–5000 mg / L until the nitrate nitrogen removal rate stabilized above 80%, thus completing the acclimation and biofilm formation of the sulfur-autotrophic denitrifying bacteria. The acclimation and biofilm formation treatment time was 25–35 days. The components of the above-mentioned nutrient solution mother liquor are: 60 g / L MgSO4·7H2O, 100 g / L KHCO3, 36 g / L CaCl2·2H2O, and 5.44 g / L KH2PO4; the components of the trace element 1 mother liquor are: 6.39 g / L EDTA·2Na and 9.14 g / L FeSO4·7H2O; the components of the trace element 2 mother liquor are: 19.11 g / L EDTA·2Na, 0.014 g / L H3BO4, 0.43 g / L ZnSO4·7H2O, 0.24 g / L CoCl2·6H2O, 0.99 g / L MnCl2·4H2O, 0.25 g / L CuSO4·5H2O, 0.19 g / L NiCl2·6H2O, and 0.22 g / L NaMoO4·2H2O. The nutrient solution mother liquor was added at a rate of 5 mL / L wastewater, and trace element 1 and trace element 2 were added at a rate of 1 mL / L wastewater.

[0021] Inoculation and acclimatization of sulfur-oxidizing bacteria: Keep the second influent pump (7) and the first circulating liquid pump (8) in the off state. Under room temperature conditions, inoculate the intermediate regulating tank with sludge from the actual urban sewage treatment plant. The inoculation concentration is maintained at 3000-3500 mg / L. Add an extra air pump to pump air into the intermediate regulating tank to maintain the dissolved oxygen in the intermediate regulating tank at 3 mg / L-5 mg / L. Use a blower to blow hydrogen sulfide exhaust gas into the air inlet at the bottom of the scrubbing tower. The flocculent sludge in the intermediate regulating tank enters the scrubbing tower through a peristaltic pump to contact with hydrogen sulfide and absorb and degrade it. During the acclimatization process, run four cycles a day. Each cycle includes 10 min of influent (using the effluent from the actual domestic sewage treatment plant as the system influent), 4.5-5 h of aeration, 0.5 h of sedimentation, 10 min of drainage, and 10-40 min of idle time. The drainage ratio is 60%. The inoculation and acclimatization of sulfur-oxidizing bacteria is completed when the hydrogen sulfide removal rate is stable at more than 80%. The acclimatization period is 10 to 15 days.

[0022] Start-up and operation of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: The second inlet pump (7) and the first circulating liquid pump (8) are shut off, and the additional air pump added to the intermediate regulating tank is removed. The biofilm system that has been acclimated in the SBR is retained, all flocculent sludge in the SBR is discharged, and all the acclimated flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria in the intermediate regulating tank is added to the SBR to establish a sludge-film system with flocculent sludge mainly composed of sulfur-oxidizing bacteria and a biofilm mainly composed of sulfur-autotrophic denitrifying bacteria. The flocculent sludge is used as the circulating absorbent in the scrubbing tower, and under the action of sulfur-oxidizing bacteria, most of the hydrogen sulfide waste gas is converted into sulfur dioxide. 2- Elemental sulfur may enter the SBR; sulfur-autotrophic denitrifying bacteria in the SBR use sulfur as fuel. 2- S 0 The SBR system uses reduced sulfur as an electron donor to reduce nitrates to nitrogen. The SBR system operates in three cycles per day, each cycle including 10 minutes of influent, 5-6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, and 70-130 minutes of idle time, with a drainage ratio of 50%. The scrubbing tower is kept running continuously for 24 hours. The circulating absorbent in the scrubbing tower is divided into two circulation paths according to the different cycle operation states of the SBR system: When the SBR is in the anoxic stirring stage, the flocculent sludge can be used as the circulating absorbent and passes through the SBR (3), the first circulating liquid pump (8), the spray distributor (13), the scrubbing tower (12), the intermediate regulating water tank (9), and the second influent pump (7) in sequence, and finally flows back into the SBR (3). During this process, the second circulating liquid pump (10) is in the off state; when the SBR is in the influent, sedimentation, drainage and idle stages, the sludge can be used as the circulating absorbent and passes through the SBR (3), the first circulating liquid pump (8), the spray distributor (13), the scrubbing tower (12), the intermediate regulating water tank (9), and the second influent pump (7), and finally flows back into the SBR (3). During this process, the second circulating liquid pump (10) is in the off state. During this period, the flocculent sludge in the SBR cannot be used as circulating absorbent to enter the scrubbing tower. To ensure the 24-hour operation of the scrubbing tower, the flocculent sludge in the intermediate regulating water tank is used as circulating absorbent and passes through the intermediate regulating water tank (9), the second circulating liquid pump (10), the spray water distributor (13), the scrubbing tower (12) in sequence, and finally flows back into the intermediate regulating water tank (9). During this process, the second inlet pump (7) and the first circulating liquid pump (8) are in the off state; thus, efficient and synchronous removal of hydrogen sulfide waste gas and nitrate wastewater is achieved.

[0023] Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: During system operation, as flocculent sludge dominated by sulfur-oxidizing bacteria grows in the SBR, more of the hydrogen sulfide absorbed in the scrubbing tower exists in the form of sulfate. 2- and S 0 As the accumulation rate gradually decreases, the nitrate nitrogen removal rate also decreases. When the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging flocculent sludge from the SBR, maintaining the flocculent sludge concentration in the SBR at 1000–1100 mg / L to stabilize the sulfur content. 2- and S0 The substrate supply is controlled by adding Na2CO3 or NaOH during system startup and operation to maintain the pH at 7–8.5.

Claims

1. A method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology, the apparatus of which includes a raw water tank (1), a first inlet pump (2), an SBR (3), a stirrer (4), a pH / DO real-time monitoring device (5), polyethylene packing inoculated with sulfur autotrophic denitrifying bacteria (6), a second inlet pump (7), a first circulating liquid pump (8), an intermediate regulating water tank (9), a second circulating liquid pump (10), an outlet valve (11), a scrubbing tower (12), a spray water distributor (13), a blower (14), and a flow meter (15). The raw water tank (1) is connected to the SBR (3) via the first inlet pump (2). The SBR (3) is equipped with a stirrer (4) and a real-time pH / DO monitoring device (5) to monitor the dissolved oxygen and pH of the sequencing batch reactor (SBR) (3). Polyethylene packing material (6) inoculated with sulfur autotrophic denitrifying bacteria is added to the SBR (3). The SBR (3) is connected to the spray distributor (13) at the top of the scrubbing tower (12) via the first circulating liquid pump (8). The bottom of the scrubbing tower (12) The part is connected to the intermediate regulating water tank (9); the intermediate regulating water tank (9) is connected to the SBR (3) through the second inlet water pump (7), and connected to the spray water distributor (13) at the top of the scrubbing tower (12) through the second circulating liquid water pump (10); the blower (14) is connected to the bottom of the scrubbing tower (12) through the flow meter (15) and blows hydrogen sulfide waste gas into it; an outlet valve (11) is installed in the outlet water pipe of the SBR (3) for draining the supernatant of the SBR (3); characterized in that, Includes the following steps: 1) Acclimation and biofilm formation of sulfur autotrophic denitrifying bacteria: The second influent pump (7) and the first circulating liquid pump (8) were shut off. Polyethylene packing material was added to the sequencing batch reactor (SBR) at a filling ratio of 40-50%. Sludge from an actual urban wastewater treatment plant was used as inoculum sludge and introduced into the SBR for acclimation and biofilm formation. Sodium sulfide and nitrate nitrogen were mixed in water as substrate for acclimating sulfur autotrophic denitrifying bacteria. - The -N concentration is 50-60 mg / L, and the S / N mass ratio is 1.5-2. The mixed solution is injected into the sequencing batch reactor (SBR). Simultaneously, a nutrient solution is prepared to ensure normal physiological activity of the microorganisms. During the acclimation process, three cycles are run daily. Each cycle includes 10 minutes of influent, 5-6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of effluent discharge, and 70-130 minutes of idle time, with a effluent ratio of 50%. The sludge concentration after inoculation is maintained at 4000-5000 mg / L until the nitrate nitrogen removal rate stabilizes above 80%, thus completing the acclimation and biofilm formation of the sulfur-autotrophic denitrifying bacteria. The acclimation and biofilm formation treatment time is 25-35 days. The nutrient solution mother liquor dosage is 5 mL / L of wastewater, and the mother liquors for trace element 1 and trace element 2 are 1 mL / L of wastewater. 2) Inoculation and acclimatization of sulfur-oxidizing bacteria: Keep the second influent pump (7) and the first circulating liquid pump (8) in the off state. Inoculate the intermediate regulating tank with whole-process sludge from the actual urban domestic sewage treatment plant. Maintain the inoculation concentration at 3000~3500mg / L. Add an extra air pump to pump air into the intermediate regulating tank to maintain the dissolved oxygen in the intermediate regulating tank at 3mg / L~5mg / L. Use a blower to blow hydrogen sulfide waste gas into the air inlet at the bottom of the scrubbing tower. The flocculent sludge in the intermediate regulating tank enters the washing tower to contact with hydrogen sulfide and absorb and degrade it. During the acclimation process, the system operates for four cycles per day. Each cycle includes 10 minutes of influent (using the effluent from an actual urban wastewater treatment plant as the influent), 4.5-5 hours of aeration, 0.5 hours of sedimentation, 10 minutes of effluent discharge, and 10-40 minutes of idle time. The effluent ratio is 60%. The inoculation and acclimation of sulfur-oxidizing bacteria are completed when the hydrogen sulfide removal rate stabilizes at over 80%. The acclimation treatment time is 10-15 days. 3) Start-up and operation of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: Turn off the second inlet pump (7) and the first circulating liquid pump (8), remove the air pump added to the intermediate regulating tank; retain the biofilm system that has been acclimated in the sequencing batch reactor (SBR), discharge all the flocculent sludge in the SBR, and add all the acclimated flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria in the intermediate regulating tank into the SBR, establish a mud-film system with flocculent sludge mainly composed of sulfur-oxidizing bacteria and biofilm mainly composed of sulfur autotrophic denitrifying bacteria, and use the flocculent sludge in the SBR as the circulating absorbent in the scrubbing tower; the SBR system runs three cycles a day, each cycle including 10 min of inlet water, 5-6 h of anoxic stirring, 0.5 h of sedimentation, 10 min of drainage, and 70-130 min of idle time, with a drainage ratio of 50%, and the scrubbing tower is kept running continuously for 24 hours; 4) Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: During system operation, as flocculent sludge, mainly composed of sulfur-oxidizing bacteria, grows, S... 2- and S 0 The accumulation rate gradually decreases, leading to a decrease in nitrate nitrogen removal rate. When the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging flocculent sludge from the sequencing batch reactor (SBR). This maintains the flocculent sludge concentration in the SBR at 1000–1100 mg / L to stabilize the sulfur content. 2- and S 0 The substrate supply is controlled by adding Na2CO3 or NaOH during system startup and operation to maintain the pH at 7-8.

5.

2. The method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology according to claim 1, characterized in that: The components of the above-mentioned nutrient solution mother liquor are: 60 g / L MgSO4·7H2O, 100 g / L KHCO3, 36 g / L CaCl2·2H2O, and 5.44 g / L KH2PO4; the components of the trace element 1 mother liquor are: 6.39 g / L EDTA·2Na and 9.14 g / L FeSO4·7H2O; the components of the trace element 2 mother liquor are: 19.11 g / L EDTA·2Na, 0.014 g / L H3BO4, 0.43 g / L ZnSO4·7H2O, 0.24 g / L CoCl2·6H2O, 0.99 g / L MnCl2·4H2O, 0.25 g / L CuSO4·5H2O, 0.19 g / L NiCl2·6H2O, and 0.22 g / L NaMoO4·2H2O.

3. The method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology according to claim 1, characterized in that: The circulating absorbent in the scrubbing tower is divided into two circulation paths according to the different cycle operation states of the sequencing batch reactor (SBR) system: When the SBR is in the anoxic stirring stage, the flocculent sludge in it serves as the circulating absorbent and passes through the SBR (3), the first circulating liquid pump (8), the spray distributor (13), the scrubbing tower (12), the intermediate regulating tank (9), and the second inlet pump (7) in sequence, and finally flows back into the SBR (3). During this process, the second circulating liquid pump (10) is in the off state; When the SBR is in the influent, sedimentation, drainage and idle stages, the flocculent sludge in the sequencing batch reactor (SBR) cannot be used as circulating absorbent to enter the scrubbing tower. In order to ensure the 24-hour operation of the scrubbing tower, the flocculent sludge in the intermediate regulating tank is used as circulating absorbent and passes through the intermediate regulating tank (9), the second circulating liquid pump (10), the spray distributor (13), the scrubbing tower (12) in sequence, and finally flows back into the intermediate regulating tank (9). During this process, the second influent pump (7) and the first circulating liquid pump (8) are in the off state.

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