Device and method for synchronously removing hydrogen sulfide waste gas and nitrate wastewater by using sulfur autotrophic denitrification technology

Abstract

The invention discloses a device and a method for synchronously removing hydrogen sulfide waste gas and nitrate wastewater by using a sulfur autotrophic denitrification technology, and belongs to the technical field of biological deodorization and sewage treatment. The device mainly comprises a water tank, a sequencing batch reactor (SBR), a washing tower, a water pump, a fan and the like which are connected in sequence. The method comprises the following steps: the discharged hydrogen sulfide waste gas enters a washing tower and is contacted and absorbed with circularly flowing absorption liquid to form mixed liquid mainly comprising S < 2-> and S < 0 >; the mixed solution and nitrate wastewater (or secondary effluent of a municipal sewage treatment plant taking nitrate nitrogen as a main pollutant) enter an SBR (sequencing batch reactor) together, and autotrophic nitrogen removal is carried out through a sulfur autotrophic denitrification way by taking reduced sulfur (S2-and S0 as main components) in the mixed solution as electron donors. According to the method, the hydrogen sulfide waste gas and the nitrate waste water are economically, efficiently and synchronously removed finally, and a brand new thought is provided for combination of biological deodorization and deep denitrification of urban sewage.

Description

Technical Field

[0001] The invention belongs to the technical field of biological deodorization and sewage treatment, and specifically relates to a device and method for realizing the simultaneous removal of reduced sulfide and nitrogen in urban sewage by using sulfur autotrophic denitrification technology. Background Art

[0002] Nitrogen-containing pollutants are still one of the main ecological problems of water environment. Excessive nitrogen-containing wastewater discharged into the water will cause eutrophication of the water, forming "water bloom" or "red tide" phenomenon, causing the death of aquatic organisms and destroying biodiversity. At present, a variety of water treatment denitrification technologies have emerged, mainly including physical, chemical and biological methods. Biological denitrification is an important means of denitrification of wastewater. Most of the sewage treatment plants currently in operation use traditional nitrification and denitrification biological denitrification technology, among which denitrification is an important part of biological denitrification. However, the C / N of urban sewage in my country is relatively low, so sufficient carbon source needs to be provided in the denitrification process to achieve a good denitrification effect. The addition of external carbon source will not only increase the cost, but also may cause secondary pollution. Nowadays, the role of autotrophic denitrification technology without external carbon source in water pollution control is becoming increasingly important.

[0003] With the development of society, although the number of complaints and reports of odor / peculiar smell has decreased year by year in the past three years, the proportion of the total number of complaints and reports has steadily increased, and it is also one of the most strongly complained environmental issues by the public. In recent years, due to the continuous development of urban construction and the reduction of land resources, the location of urban sewage treatment plants has become closer and closer to residential areas. The odorous gases discharged during the sewage treatment process have inevitably become the main source of urban odorous gases. The main odor-causing components are sulfur-containing compounds, such as hydrogen sulfide and methyl mercaptan. Therefore, it is imperative to remove odorous gases, especially sulfur-containing compounds.

[0004] In the study of wastewater denitrification, the autotrophic denitrification process is quite common. Among them, sulfur autotrophic denitrification refers to the process in which Thiobacillus denitrifications (such as Thiobacillus denitrifications) can utilize reduced sulfur (S 0 , S 2- 、SO 3 2- , S 2 O 3 2- etc.) as electron donors, with NO 3 - -N or NO 2 - -N is an electron acceptor, and at the same time obtains energy through the oxidation process of reduced sulfur to convert NO 3 - -N Restore to N 2The advantages of this process include no need for external carbon source and low sludge production. 3 - -N inorganic wastewater has the advantage of reducing costs. In terms of deodorization technology, biological treatment technology has become the most ideal technology for odor gas treatment because it does not produce secondary pollution, has low operating costs, low infrastructure equipment costs, and can operate stably for a long time.

[0005] The present invention fully combines biological deodorization with sulfur autotrophic denitrification technology, and realizes the economical and efficient removal of nitrate wastewater (or secondary effluent of urban sewage treatment plants with nitrate nitrogen as the main pollutant) and hydrogen sulfide waste gas by constructing a new type of biological scrubber system. The flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria is used as the circulating absorption liquid of the scrubber, which converts the hydrogen sulfide waste gas entering the scrubber into sulfur-oxidizing waste gas. 2- and S 0 The mixed liquid and nitrate wastewater (or secondary effluent from urban sewage treatment plants with nitrate nitrogen as the main pollutant) enter the SBR reactor together, with the reduced sulfur (S 2- and S 0 The main source of sulfur is sulfur (mainly) as an electron donor, and autotrophic denitrification is carried out through the sulfur autotrophic denitrification pathway. Ultimately, the economical and efficient simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater is achieved, providing a new idea and method for the combination of biological deodorization and deep sewage treatment. Summary of the invention

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

[0007] The raw water tank (1) is connected to the sequencing batch reactor (3) through the first water inlet pump (2). The sequencing batch reactor (3) is provided with a stirrer (4). A pH / DO real-time monitoring device (5) is also provided to monitor the dissolved oxygen and pH of the sequencing batch reactor (3). Polyethylene filler (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 water distributor (13) at the top of the washing tower (12) through the first circulating liquid water pump (8); the bottom of the washing 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) through the second water inlet pump (7), and is connected to the spray water distributor (13) at the top of the washing tower (12) through the second circulating liquid water pump (10). The fan (14) is connected to the bottom of the washing tower (12) through a flow meter (15), and hydrogen sulfide waste gas is blown into it. A water outlet valve (11) is arranged on the water outlet pipeline of the sequencing batch reactor (3) to discharge the supernatant liquid of the sequencing batch reactor (3).

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

[0009] 1) Acclimation and biofilm formation of sulfur autotrophic denitrifying bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are turned off, and polyethylene filler is added to the SBR at room temperature, with a filling ratio of 40-50%, and the whole process sludge of an actual urban sewage treatment plant is used as inoculated sludge to introduce into the SBR for acclimation and biofilm formation, and sodium sulfide and nitrate nitrogen are used as a substrate mixture for acclimation of sulfur autotrophic denitrifying bacteria, wherein the substrate mixture NO 3 - -N concentration is 50-60mg / L, S / N mass ratio is 1.5-2, the mixed liquid is pumped into SBR, and nutrient solution and trace elements of specific components are prepared to ensure normal physiological activities of microorganisms. During the domestication process, three cycles are run every day, each cycle includes 10 minutes of water intake, 5-6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, 70-130 minutes of idleness, and a drainage ratio of 50%. Ensure that the sludge concentration after inoculation is maintained at 4000-5000mg / L until the nitrate nitrogen removal rate is stabilized at more than 80%, that is, the domestication and biofilm formation of sulfur autotrophic denitrifying bacteria are completed, and the domestication and biofilm formation treatment time is 25-35d. The above nutrient solution mother liquor composition is: 60g / LMgSO 4 7H 2 O, 100g / LKHCO 3 、36g / L CaCl 2 ·2H 2 O, 5.44g / L KH 2 PO 4; Trace element 1 mother solution composition: 6.39g / L EDTA·2Na, 9.14g / L FeSO 4 7H 2 O; the components of trace element 2 mother solution are: 19.11g / L EDTA·2Na, 0.014g / L H 3 BO 4 、0.43g / L ZnSO 4 7H 2 O, 0.24 g / L CoCl 2 6H 2 O, 0.99 g / L MnCl 2 ·4H 2 O, 0.25g / LCuSO 4 ·5H 2 O, 0.19g / LNiCl 2 6H 2 O, 0.22g / L NaMoO 4 ·2H 2 O. The dosage of nutrient solution mother solution is 5 mL / L sewage, and the dosage of trace element 1 and trace element 2 is 1 mL / L sewage.

[0010] 2) Inoculation and domestication of sulfur-oxidizing bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are still kept in a closed state. Under room temperature, the whole process sludge from the actual urban sewage treatment plant is inoculated in the intermediate regulating water tank, and the inoculation concentration is maintained at 3000-3500 mg / L. An additional air pump is added to pump air into the intermediate regulating water tank through the air pump to maintain the dissolved oxygen in the intermediate regulating water tank at 3 mg / L-5 mg / L. The hydrogen sulfide waste gas is blown into the air inlet at the bottom of the washing tower by a fan, and the flocculent sludge in the intermediate regulating water tank enters the washing tower through a peristaltic pump to contact with hydrogen sulfide and absorb and degrade it. During the domestication process, four cycles are run every day, each cycle including water intake for 10 minutes (using the effluent of the actual domestic sewage treatment plant as the system's water intake), aeration for 4.5-5 hours, sedimentation for 0.5 hours, drainage for 10 minutes, idleness for 10-40 minutes, and drainage ratio of 60%, until the hydrogen sulfide removal rate is stabilized at more than 80%, that is, the inoculation and domestication of sulfur-oxidizing bacteria are completed. The acclimatization time is 10 to 15 days.

[0011] 3) Start-up and operation of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: end the shutdown state of the second water inlet pump (7) and the first circulating liquid water pump (8), remove the additional air pump added in the intermediate regulating water tank. Keep the biofilm system that has been domesticated in the SBR, discharge all the flocculent sludge in the SBR, and add all the flocculent sludge in the intermediate regulating water tank that has been domesticated with sulfur-oxidizing bacteria as the main functional bacteria to 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, use flocculent sludge as the circulating absorption liquid in the washing tower, and convert most of the hydrogen sulfide waste gas into S under the action of sulfur-oxidizing bacteria. 2- or elemental sulfur enters the SBR; the sulfur autotrophic denitrifying bacteria in the SBR are S 2- , S 0 The reduced sulfur, which is mainly composed of sulfur, is used as an electron donor to reduce nitrate to nitrogen. The SBR system runs three cycles a day, each cycle includes 10 minutes of water intake, 5 to 6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, and 70 to 130 minutes of idle time. The drainage ratio is 50%, and the washing tower is kept in uninterrupted operation for 24 hours. The circulating absorption liquid in the washing 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 floc sludge therein can be used as the circulating absorption liquid, and passes through the SBR (3), the first circulating liquid water pump (8), the spray water distributor (13), the washing tower (12), the intermediate regulating water tank (9), the second water intake pump (7), and finally flows back into the SBR (3). During this process, the second circulating liquid water pump (10) is in a closed state; when the SBR is in the water intake, sedimentation, drainage and idle stages, the sludge floccules in the washing tower can be used as the circulating absorption liquid. During the first stage, the floc sludge in the SBR cannot be used as circulating absorption liquid to enter the washing tower. In order to ensure the 24-hour operation of the washing tower, the floc sludge in the intermediate regulating water tank is used as the circulating absorption liquid, and passes through the intermediate regulating water tank (9), the second circulating liquid water pump (10), the spray water distributor (13), the washing tower (12) in sequence, and finally flows back into the intermediate regulating water tank (9). During this process, the second water inlet pump (7) and the first circulating liquid water pump (8) are in the closed state; thereby achieving efficient and synchronous removal of hydrogen sulfide waste gas and nitrate wastewater.

[0012] 4) Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: When the system is running, as the floc sludge mainly composed of sulfur-oxidizing bacteria grows, S 2- and S 0 The accumulation rate gradually decreases, resulting in a decrease in the nitrate nitrogen removal rate. When the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging the flocculent sludge in the SBR, so that the flocculent sludge concentration in the SBR is maintained at 1000-1100 mg / L to stabilize the S 2- and S 0During system startup and operation, Na 2 CO 3 Or use NaOH to control the pH at 7-8.5.

[0013] In summary, the present invention fully combines biological deodorization with sulfur autotrophic denitrification technology, and realizes the economical and efficient removal of nitrate wastewater (or secondary effluent of urban sewage treatment plants with nitrate nitrogen as the main pollutant) and hydrogen sulfide waste gas by constructing a new type of biological scrubber system. The flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria is used as the circulating absorption liquid of the scrubber, which converts the hydrogen sulfide waste gas entering the scrubber into sulfur-oxidizing waste gas with sulfur-oxidizing bacteria as the main functional bacteria. 2- and S 0 The mixed liquid and nitrate wastewater (or secondary effluent from urban sewage treatment plants with nitrate nitrogen as the main pollutant) enter the SBR reactor together, with the reduced sulfur (S 2- and S 0 The invention provides a biological denitrification and deodorization device and method for treating waste with waste without adding additional organic carbon source. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the device structure for achieving the simultaneous removal of hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology.

[0015] Figure 1 In the figure: (1) is the raw water tank, (2) is the first water inlet pump, (3) is the sequencing batch reactor SBR, (4) is the agitator, (5) is the pH / DO real-time monitoring device, (6) is the polyethylene filler inoculated with sulfur autotrophic denitrifying bacteria, (7) is the second water inlet pump, (8) is the first circulating liquid water pump, (9) is the intermediate regulating water tank, (10) is the second circulating liquid water pump, (11) is the outlet valve, (12) is the washing tower, (13) is the spray water distributor, (14) is the fan, and (15) is the flow meter. DETAILED DESCRIPTION

[0016] The experimental system is shown in the figure Figure 1 As shown, each reactor is made of organic glass. The total volume of the SBR reactor (3) is 11L, and the effective volume is 10L; the total volume of the washing tower is 5.2L; the intermediate regulating water tank is 2L, and the effective volume is 1.8L. 3 - -N concentration 40~60mg / L, H 2 S intake concentration 400~600mg / m 3 , gas flow rate 5L / min.

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

[0018] The raw water tank (1) is connected to the sequencing batch reactor (3) through the first water inlet pump (2). The sequencing batch reactor (3) is provided with a stirrer (4). A pH / DO real-time monitoring device (5) is also provided to monitor the dissolved oxygen and pH of the sequencing batch reactor (3). Polyethylene filler (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 water distributor (13) at the top of the washing tower (12) through the first circulating liquid water pump (8); the bottom of the washing 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) through the second water inlet pump (7), and is connected to the spray water distributor (13) at the top of the washing tower (12) through the second circulating liquid water pump (10). The fan (14) is connected to the bottom of the washing tower (12) through a flow meter (15), and hydrogen sulfide waste gas is blown into it. A water outlet valve (11) is arranged on the water outlet pipeline of the sequencing batch reactor (3) to discharge the supernatant liquid of the sequencing batch reactor (3).

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

[0020] Domestication and biofilm formation of sulfur autotrophic denitrifying bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are turned off, and polyethylene filler is added to the SBR at room temperature, with a filling ratio of 40-50%, and the whole process sludge of an actual urban sewage treatment plant is used as inoculated sludge to introduce into the SBR for domestication and biofilm formation, and sodium sulfide and nitrate nitrogen are used as a substrate mixed solution for domestication of sulfur autotrophic denitrifying bacteria, wherein the substrate mixed solution NO 3 --N concentration is 50-60mg / L, S / N mass ratio is 1.5-2, the mixed liquid is pumped into SBR, and nutrient solution and trace elements of specific components are prepared to ensure normal physiological activities of microorganisms. During the domestication process, three cycles are run every day, each cycle includes 10 minutes of water intake, 5-6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, 70-130 minutes of idleness, and a drainage ratio of 50%. Ensure that the sludge concentration after inoculation is maintained at 4000-5000mg / L until the nitrate nitrogen removal rate is stabilized at more than 80%, that is, the domestication and biofilm formation of sulfur autotrophic denitrifying bacteria are completed, and the domestication and biofilm formation treatment time is 25-35d. The above nutrient solution mother liquor composition is: 60g / L MgSO 4 7H 2 O, 100g / LKHCO 3 、36g / L CaCl 2 ·2H 2 O, 5.44g / L KH 2 PO 4 ; Trace element 1 mother liquor composition: 6.39g / LEDTA·2Na, 9.14g / L FeSO 4 7H 2 O; the components of trace element 2 mother solution are: 19.11g / L EDTA·2Na, 0.014g / L H 3 BO 4 、0.43g / L ZnSO 4 7H 2 O, 0.24 g / L CoCl 2 6H 2 O, 0.99 g / L MnCl 2 ·4H 2 O, 0.25g / LCuSO 4 ·5H 2 O, 0.19g / LNiCl 2 6H 2 O, 0.22g / L NaMoO 4 ·2H 2 O. The dosage of nutrient solution mother solution is 5 mL / L sewage, and the dosage of trace element 1 and trace element 2 is 1 mL / L sewage.

[0021] Inoculation and domestication of sulfur-oxidizing bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are still kept in a closed state. Under room temperature, the whole process sludge from the actual urban sewage treatment plant is inoculated in the intermediate regulating water tank, and the inoculation concentration is maintained at 3000-3500 mg / L. An additional air pump is added to pump air into the intermediate regulating water tank through the air pump to maintain the dissolved oxygen in the intermediate regulating water tank at 3mg / L-5mg / L. The hydrogen sulfide waste gas is blown into the air inlet at the bottom of the washing tower by a fan, and the flocculent sludge in the intermediate regulating water tank enters the washing tower through a peristaltic pump to contact with hydrogen sulfide and absorb and degrade it. During the domestication process, four cycles are run every day, each cycle including water intake for 10 minutes (using the effluent of the actual domestic sewage treatment plant as the system's water intake), aeration for 4.5-5 hours, sedimentation for 0.5 hours, drainage for 10 minutes, idleness for 10-40 minutes, and drainage ratio of 60%, until the hydrogen sulfide removal rate is stabilized at more than 80%, that is, the inoculation and domestication of sulfur-oxidizing bacteria are completed. The acclimatization time is 10 to 15 days.

[0022] Start-up and operation of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: end the shutdown state of the second water inlet pump (7) and the first circulating liquid water pump (8), remove the additional air pump added in the intermediate regulating water tank. Keep the biofilm system that has been domesticated in the SBR, discharge all the floc sludge in the SBR, and add all the floc sludge in the intermediate regulating water tank that has been domesticated with sulfur-oxidizing bacteria as the main functional bacteria to the SBR, establish a mud film system with floc sludge mainly composed of sulfur-oxidizing bacteria and biofilm mainly composed of sulfur autotrophic denitrifying bacteria, use floc sludge as the circulating absorption liquid in the washing tower, and convert most of the hydrogen sulfide waste gas into S under the action of sulfur-oxidizing bacteria. 2- or elemental sulfur enters the SBR; the sulfur autotrophic denitrifying bacteria in the SBR are S 2- , S 0The reduced sulfur, which is mainly composed of sulfur, is used as an electron donor to reduce nitrate to nitrogen. The SBR system runs three cycles a day, each cycle includes 10 minutes of water intake, 5 to 6 hours of anoxic stirring, 0.5 hours of sedimentation, 10 minutes of drainage, and 70 to 130 minutes of idle time. The drainage ratio is 50%, and the washing tower is kept in uninterrupted operation for 24 hours. The circulating absorption liquid in the washing 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 floc sludge therein can be used as the circulating absorption liquid, and passes through the SBR (3), the first circulating liquid water pump (8), the spray water distributor (13), the washing tower (12), the intermediate regulating water tank (9), the second water intake pump (7), and finally flows back into the SBR (3). During this process, the second circulating liquid water pump (10) is in a closed state; when the SBR is in the water intake, sedimentation, drainage and idle stages, the sludge floccules in the washing tower can be used as the circulating absorption liquid. During the first stage, the floc sludge in the SBR cannot be used as circulating absorption liquid to enter the washing tower. In order to ensure the 24-hour operation of the washing tower, the floc sludge in the intermediate regulating water tank is used as the circulating absorption liquid, and passes through the intermediate regulating water tank (9), the second circulating liquid water pump (10), the spray water distributor (13), the washing tower (12) in sequence, and finally flows back into the intermediate regulating water tank (9). During this process, the second water inlet pump (7) and the first circulating liquid water pump (8) are in the closed state; thereby achieving efficient and synchronous removal of hydrogen sulfide waste gas and nitrate wastewater.

[0023] Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: When the system is running, with the growth of flocculent sludge mainly composed of sulfur-oxidizing bacteria in the SBR, the hydrogen sulfide absorbed in the scrubber exists more in the form of sulfate. 2- and S 0 The accumulation rate gradually decreases, resulting in a decrease in the nitrate nitrogen removal rate. When the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging the flocculent sludge in the SBR, so that the flocculent sludge concentration in the SBR is maintained at 1000-1100 mg / L to stabilize S 2- and S 0 During system startup and operation, Na 2 CO 3 Or use NaOH to control the pH at 7-8.5.

Claims

1. A device for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater using sulfur autotrophic denitrification technology, characterized in that: It comprises a raw water tank (1), a first water inlet pump (2), a sequencing batch reactor (SBR) (3), an agitator (4), a pH / DO real-time monitoring device (5), a polyethylene filler inoculated with sulfur autotrophic denitrifying bacteria (6), a second water inlet pump (7), a first circulating liquid water pump (8), an intermediate regulating water tank (9), a second circulating liquid water pump (10), a water outlet valve (11), a washing tower (12), a spray water distributor (13), a fan (14), and a flow meter (15); The raw water tank (1) is connected to a sequencing batch reactor (3) via a first water inlet pump (2); a stirrer (4) is provided in the sequencing batch reactor (3); and a pH / DO real-time monitoring device (5) is provided to monitor the dissolved oxygen and pH of the sequencing batch reactor (3); a polyethylene filler (6) inoculated with sulfur autotrophic denitrifying bacteria is added to the sequencing batch reactor (3); the sequencing batch reactor (3) is connected to a spray water distributor (13) at the top of a washing tower (12) via a first circulating liquid water pump (8); the washing tower (1 2) The bottom is connected to an intermediate regulating water tank (9); the intermediate regulating water tank (9) is connected to the sequencing batch reactor (3) through a second water inlet pump (7), and is connected to a spray water distributor (13) at the top of a washing tower (12) through a second circulating liquid water pump (10); a fan (14) is connected to the bottom of the washing tower (12) through a flow meter (15), and hydrogen sulfide waste gas is blown into the washing tower (12); a water outlet valve (11) is provided on the water outlet pipeline of the sequencing batch reactor (3) for draining the supernatant of the sequencing batch reactor (3).

2. A method for simultaneously removing hydrogen sulfide waste gas and nitrate wastewater by using the device described in claim 1 using sulfur autotrophic denitrification technology, characterized in that: The following steps are involved: 1) Acclimation and biofilm formation of sulfur autotrophic denitrifying bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are turned off, polyethylene filler is added to the SBR, and the filling ratio is 40-50%. The whole process sludge of the actual urban sewage treatment plant is used as inoculated sludge to introduce into the SBR for acclimation and biofilm formation, and sodium sulfide and nitrate nitrogen are used as the substrate mixture for acclimation of sulfur autotrophic denitrifying bacteria, wherein the substrate mixture NO3 - -N concentration is 50-60mg / L, S / N mass ratio is 1.5-2, the mixed liquid is pumped into SBR, and nutrient solution is prepared to ensure normal physiological activity of microorganisms; three cycles are run every day during the domestication process, each cycle includes water intake for 10min, anoxic stirring for 5-6h, sedimentation for 0.5h, drainage for 10min, idle for 70-130min, and drainage ratio is 50%; ensure that the sludge concentration after inoculation is maintained at 4000-5000mg / L until the nitrate nitrogen removal rate is stabilized at more than 80%, that is, the domestication and biofilm formation of sulfur autotrophic denitrifying bacteria are completed, and the domestication and biofilm formation treatment time is 25-35d; the above nutrient solution mother liquor composition is: 60g / L MgSO4·7H2O, 100g / L KHCO3, 36g / L CaCl2·2H2O, 5.44g / LKH2PO4; the mother liquor composition of trace element 1 is: 6.39g / L EDTA·2Na, 9.14g / L FeSO4·7H2O; the mother liquor composition of trace element 2 is: 19.11g / L EDTA·2Na, 0.014g / L H3BO4, 0.43g / L ZnSO4·7H2O, 0.24g / LCoCl2·6H2O, 0.99g / L MnCl2·4H2O, 0.25g / LCuSO4·5H2O, 0.19g / LNiCl2·6H2O, 0.22g / LNaMoO4·2H2O; the dosage of nutrient solution mother liquor is 5mL / L sewage, and the dosage of trace element 1 and trace element 2 mother liquor is 1mL / L sewage; 2) Inoculation and domestication of sulfur-oxidizing bacteria: The second water inlet pump (7) and the first circulating liquid water pump (8) are still kept in a closed state, and the whole process sludge from the actual urban sewage treatment plant is inoculated in the intermediate regulating water tank, and the inoculation concentration is maintained at 3000-3500 mg / L. An additional air pump is added to pump air into the intermediate regulating water tank through the air pump to maintain the dissolved oxygen in the intermediate regulating water tank at 3 mg / L-5 mg / L; a fan is used to blow hydrogen sulfide waste gas into the air inlet at the bottom of the scrubber, and the intermediate regulating water tank is provided with a plurality of air pumps. The floc sludge in the regulating water tank enters the washing tower through a peristaltic pump to contact with hydrogen sulfide and absorb and degrade it. During the domestication process, four cycles are run every day. Each cycle includes 10 minutes of water intake, with the effluent from the actual domestic sewage plant as the system's water intake, 4.5 to 5 hours of aeration, 0.5 hours of sedimentation, 10 minutes of drainage, 10 to 40 minutes of idleness, and a drainage ratio of 60%. The inoculation and domestication of sulfur-oxidizing bacteria are completed until the hydrogen sulfide removal rate is stabilized at more than 80%. The domestication treatment time is 10 to 15 days. 3) Startup and operation of the system for synchronously removing hydrogen sulfide and nitrate nitrogen: end the closed state of the second water inlet pump (7) and the first circulating liquid water pump (8), remove the air pump added in the intermediate regulating water tank; retain the biofilm system that has been domesticated in the SBR, discharge all the flocculent sludge in the SBR, and add all the flocculent sludge with sulfur-oxidizing bacteria as the main functional bacteria in the intermediate regulating water tank to 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 absorption liquid in the washing tower; the SBR system runs three cycles a day, each cycle includes water intake for 10 minutes, anoxic stirring for 5 to 6 hours, sedimentation for 0.5 hours, drainage for 10 minutes, idleness for 70 to 130 minutes, drainage ratio of 50%, and 24 hours of uninterrupted operation in the washing tower; The circulating absorption liquid in the washing tower is divided into two circulation paths according to the different periodic operation states of the SBR system: when the SBR is in the anoxic stirring stage, the floc sludge therein can be used as the circulating absorption liquid, and passes through the SBR (3), the first circulating liquid water pump (8), the spray water distributor (13), the washing tower (12), the intermediate regulating water tank (9), the second water inlet pump (7) in sequence, and finally flows back into the SBR (3). During this process, the second circulating liquid water pump (10) is in a closed state; when the SBR is in the water inlet, sedimentation, drainage and idle stages, the floc sludge in the SBR cannot be used as the circulating absorption liquid to enter the washing tower. In order to ensure the 24-hour operation of the washing tower, the floc sludge in the intermediate regulating water tank is used as the circulating absorption liquid, and passes through the intermediate regulating water tank (9), the second circulating liquid water pump (10), the spray water distributor (13), the washing tower (12) in sequence, and finally flows back into the intermediate regulating water tank (9). During this process, the second water inlet pump (7) and the first circulating liquid water pump (8) are in a closed state; 4) Stable operation and maintenance of the system for simultaneous removal of hydrogen sulfide and nitrate nitrogen: When the system is running, as the floc sludge mainly composed of sulfur-oxidizing bacteria grows, S 2- and S 0 The accumulation rate gradually decreases, resulting in a decrease in the nitrate nitrogen removal rate; when the nitrate nitrogen removal rate drops below 80%, the biomass of sulfur-oxidizing bacteria is reduced by discharging the flocculent sludge in the SBR, so that the flocculent sludge concentration in the SBR is maintained at 1000-1100 mg / L to stabilize S 2- and S 0 substrate supply; during system startup and operation, the pH is controlled at 7-8.5 by adding Na2CO3 or NaOH.

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