A microbial electrochemical coupled desulfurization device and method

Abstract

The present invention discloses a microbial electrochemical coupled desulfurization device and method, relating to the field of microbial electrochemical water treatment technology. The microbial electrochemical coupled desulfurization device comprises a flotation unit, a desulfurization unit, and an aerobic unit. The flotation unit removes suspended matter and oil pollutants from wastewater. Microorganisms in the desulfurization and aerobic units reduce sulfates, thiosulfates, and sulfites in the sulfur-containing wastewater to sulfides, while simultaneously degrading organic matter in the wastewater and converting chemical energy into electrical energy to power the electrical equipment in the desulfurization device. While meeting petrochemical wastewater discharge standards, the device can effectively reduce energy consumption and operating costs for sulfur-containing wastewater treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of microbial electrochemical water treatment, and more particularly to a microbial electrochemical coupled desulfurization device and method. Background Art

[0002] At present, a large amount of wastewater is generated in the process of oil extraction, drilling, well washing and oil refining. In particular, the sulfur-containing wastewater generated in the refining process is the most serious pollution. Sulfur-containing wastewater has the characteristics of poor biodegradability, strong corrosiveness, high ammonia nitrogen content and high suspended solids concentration. It causes great pollution to the environment and urgently needs to be properly treated.

[0003] However, existing petrochemical sulfur-containing wastewater treatment technologies mainly include: catalytic oxidation, ozone oxidation, flocculation sedimentation, adsorption filtration, anaerobic biological method and aerobic biological method. Although the above petrochemical sulfur-containing wastewater treatment methods can remove pollutants, they require the addition of chemical agents or the use of high-efficiency aeration, which has problems such as large secondary pollution, high energy consumption and high operating costs.

[0004] Therefore, how to reduce the energy consumption of petrochemical sulfur-containing wastewater treatment and lower the operating costs while meeting the discharge standards of sulfur-containing wastewater is a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] In view of this, the present invention provides a microbial electrochemical coupled desulfurization device and method, in which microorganisms reduce sulfate, thiosulfate and sulfite in sulfur-containing wastewater to sulfide, while degrading organic matter in the wastewater and converting chemical energy into electrical energy to achieve energy recovery; while meeting the discharge standards of petrochemical wastewater, the energy consumption and operating costs of petrochemical sulfur-containing wastewater treatment are reduced.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention discloses a microbial electrochemical coupled desulfurization device, comprising: an air flotation unit, a desulfurization unit and an aerobic unit connected in sequence;

[0008] The flotation unit is provided with a suspended matter removal device; the aerobic unit is provided with an aeration device; the desulfurization unit and the aerobic unit are filled with a mixed bacterial solution and wastewater; and further comprises an energy supply unit, an anode plate and a cathode plate; the anode plate and the cathode plate are placed in the mixed bacterial solution; the energy supply unit is electrically connected to the suspended matter removal device, the aeration device, the anode plate and the cathode plate, respectively.

[0009] Furthermore, the flotation unit is also provided with a water inlet, a slag outlet and a mud outlet, the slag outlet is located at the top of the flotation unit, and the mud outlet is located at the bottom of the flotation unit; the suspended matter removal device is an air flotation machine and a scraper, the air flotation machine is located at the bottom of the flotation unit, and the scraper is located at the top of the flotation unit, and the scraper plate of the scraper moves back and forth horizontally, falls when it moves close to the slag outlet, and is folded when it moves away from the slag outlet.

[0010] Furthermore, a first baffle is provided between the flotation unit and the desulfurization unit, and a filtering device is provided on the upper portion of the first baffle; the filtering device is a microporous partition or a filter screen, and the pore size of the microporous partition or the filter screen is 0.5 to 2.0 mm.

[0011] Furthermore, a filling port is provided in the aerobic unit. The aeration device includes an aerator, an aeration pipe and an aerator. The aerator is connected to the aerator through the aeration pipe. The aerator is located at the bottom of the aerobic unit.

[0012] Furthermore, a second baffle is provided between the desulfurization unit and the aerobic unit. When the cathode plate is located in the aerobic unit, the second baffle adopts a proton-free exchange membrane.

[0013] Furthermore, the anode plate and the cathode plate are one or more groups; the distance between the anode plate and the cathode plate is 30cm to 100cm; the anode plate material is carbon felt, carbon cloth or graphite, and the cathode plate material is carbon felt, carbon cloth or graphite.

[0014] Furthermore, the energy supply unit includes a battery, a solar panel and an adjustable resistor; the solar panel is electrically connected to the battery, the battery, the adjustable resistor and the anode plate and the cathode plate form a loop, and the adjustable resistor adjusts the resistance value according to the wastewater pollutant concentration and the power generation capacity.

[0015] Furthermore, the mixed bacterial liquid includes a mixed bacterial liquid A and a mixed bacterial liquid B; the mixed bacterial liquid A is inoculated in the desulfurization unit, and the mixed bacterial liquid B is inoculated in the aerobic unit; the mixed bacterial liquid A includes: Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box B, and the mixed bacterial liquid B includes: Nitrosobacter and Nitrobacter.

[0016] The present invention also discloses a microbial electrochemical coupled desulfurization method, comprising the following steps:

[0017] S1: Debugging of microbial electrochemical coupled desulfurization device and acclimation of desulfurization microorganisms, specifically including the following steps:

[0018] S11: adding sodium acetate and trace elements including potassium, calcium, zinc, boron, and chromium to the petrochemical wastewater, mixing them evenly, and then pumping them into the microbial electrochemical coupled desulfurization device through the water inlet. The process is stopped when the petrochemical wastewater fills the entire device.

[0019] S12: Inoculate a mixed bacterial solution of Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box Bacteria into the desulfurization unit. The bacterial count ratio of the four bacterial genera in the bacterial solution is 1:1:1:1, and the bacterial count is not less than 10 8 Inoculate a mixed bacterial solution of Nitrite Bacteria and Nitrate Bacteria into the aerobic unit, with the bacterial count ratio of Nitrite Bacteria to Nitrate Bacteria in the bacterial solution being 1:1 to 1:5, and the bacterial count being no less than 10 7 / mL; then the desulfurization unit and aerobic unit were opened to acclimate the functional microbial flora;

[0020] S13: After acclimation for 7 to 15 days, all wastewater is discharged and new petrochemical wastewater is pumped in for a second acclimation for 7 to 15 days;

[0021] S2: Petrochemical wastewater is pumped in from the water inlet, and then the suspended solids and oil pollutants in the wastewater are effectively removed by the flotation machine and scraper. Floating oil and scum are discharged from the slag outlet, and sediment is discharged from the mud outlet. The hydraulic retention time of the flotation unit is 12 to 24 hours.

[0022] S3: After flotation treatment, wastewater is filtered through microporous partitions and then enters the desulfurization unit. Under an anaerobic environment, organic matter is hydrolyzed and acidified, breaking down into small molecules. Sulfate is oxidized into elemental sulfur by microorganisms and attached to the surface of the anode plate. The electrons generated during the oxidation process are transferred to the cathode via a wire. Under the action of a catalyst, the cathode plate uses oxygen or microorganisms as electron acceptors to oxidize the electrons transferred from the external circuit, while converting the chemical energy in the wastewater into electrical energy and storing it in a battery. The hydraulic retention time of the desulfurization unit is 24 to 48 hours.

[0023] S4: The wastewater treated by the desulfurization unit enters the aerobic unit, where the organic matter and nitrogen-containing substances in the wastewater are further degraded under the action of aeration and microorganisms. The hydraulic retention time of the aerobic unit is 24 to 48 hours, and the wastewater is discharged from the outlet after the treatment meets the standards.

[0024] It can be seen from the above technical solution that compared with the existing technology, the present invention discloses a microbial electrochemical coupled desulfurization device and method, which organically combines microbial desulfurization and microbial power generation technology. While desulfurizing wastewater, the chemical energy in the wastewater can be converted into electrical energy, realizing energy recovery in the sewage treatment process. On this basis, combined with solar power generation technology, energy self-sufficiency of the sewage treatment equipment is achieved; moreover, while treating sulfur-containing wastewater, elemental sulfur recovery is achieved, and wastewater denitrification is completed in the aerobic unit, which can achieve simultaneous denitrification and sulfur removal, thereby ensuring that the wastewater meets the discharge standards while reducing the energy consumption of wastewater treatment, reducing the operating cost of wastewater treatment, and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] In the figure: 1. Flotation unit; 2. Desulfurization unit; 3. Aerobic unit; 4. Battery; 5. First baffle; 6. Second baffle; 11. Water inlet; 12. Flotation machine; 13. Slag outlet; 14. Slag scraper; 15. Filter device; 16. Mud outlet; 21. Anode plate; 22. Cathode plate; 31. Aerator; 32. Aeration pipe; 33. Aerator; 34. Water outlet; 41. Solar panel; 42. Adjustable resistor. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The present invention discloses a microbial electrochemical coupled desulfurization device, characterized by comprising: a flotation unit 1, a desulfurization unit 2, and an aerobic unit 3 connected in sequence; a suspended solids removal device provided in the flotation unit 1; an aeration device provided in the aerobic unit 3; a mixed bacterial solution and wastewater mixture filled in the desulfurization unit 2 and the aerobic unit 3; an energy supply unit, an anode plate 21, and a cathode plate 22; the anode plate 21 and the cathode plate 22 are placed in the mixed bacterial solution; and the energy supply unit is electrically connected to the suspended solids removal device, the aeration device, the anode plate 21, and the cathode plate 22, respectively. The volume ratio of the flotation unit 1, the desulfurization unit 2, and the aerobic unit 3 can be adjusted, preferably 1:2:2. A volume ratio of 1:2:2 facilitates the production and transportation of the desulfurization device.

[0030] In the microbial electrochemical process, organic matter is fully hydrolyzed and acidified in an anaerobic environment and decomposed into small molecular substances; sulfate is oxidized into elemental sulfur mainly through chemical and microbial actions under the action of sulfate-reducing bacteria and attached to the surface of the anode plate. The electrons generated in the oxidation process are transferred to the cathode through the wire; the cathode plate uses oxygen or microorganisms as electron acceptors to oxidize the electrons transferred from the external circuit under the action of the catalyst, and at the same time converts the chemical energy in the sewage into electrical energy and stores it in the battery.

[0031] Furthermore, the flotation unit 1 is also provided with a water inlet 11, a slag outlet 13 and a mud outlet 16, the slag outlet 13 is located at the top of the flotation unit 1, and the mud outlet 16 is located at the bottom of the flotation unit 1; the suspended matter removal device is an air flotation machine 12 and a scraper 14, the air flotation machine 12 is located at the bottom of the flotation unit 1, and the scraper 14 is located at the top of the flotation unit 1, and the scraper plate of the scraper 14 reciprocates horizontally, falls when it moves close to the slag outlet 13, and is retracted when it moves away from the slag outlet 13, thereby discharging suspended matter and oil pollutants floating on the wastewater through the slag outlet 13.

[0032] Furthermore, a first baffle 5 is provided between the flotation unit 1 and the desulfurization unit 2 , and a filter device 15 is provided on the upper portion of the first baffle; the filter device 15 is a microporous partition or filter screen, and the pore size of the microporous partition or filter screen is 0.5 to 2.0 mm.

[0033] Furthermore, a filling port is provided in the aerobic unit 3 . The aeration device includes an aerator 31 , an aeration pipe 32 and an aerator 33 . The aerator 31 is connected to the aerator 33 through the aeration pipe 32 . The aerator 33 is located at the bottom of the aerobic unit 3 .

[0034] Furthermore, a second baffle 6 is provided between the desulfurization unit 2 and the aerobic unit 3. When the anode plate 21 and the cathode plate 22 are both located in the desulfurization unit, more space can be saved and the volume of the microbial electrochemical coupled desulfurization device can be reduced. When the anode plate 21 is located in the desulfurization unit 2 and the cathode plate 22 is located in the aerobic unit 3, the second baffle 6 adopts a proton-free exchange membrane, such as a Nafion membrane, which can achieve better treatment effects.

[0035] Furthermore, the anode plate 21 and the cathode plate 22 are one or more groups; the distance between the anode plate 21 and the cathode plate 22 is 30 cm to 100 cm, which can achieve a better desulfurization effect. Preferably, when the distance between the anode plate and the cathode plate is 50 cm, the desulfurization effect is best; the material of the anode plate 21 is carbon felt, carbon cloth or graphite, and the material of the cathode plate 22 is carbon felt, carbon cloth or graphite; the anode plate 21 is modified with materials such as metals, metal oxides, nano-carbon composites or conductive polymers, such as metals such as gold or titanium, metal oxides such as titanium dioxide, and the cathode plate is made of carbon felt, carbon cloth or graphite catalyzed by manganese oxide, titanium oxide or platinum.

[0036] Furthermore, the energy supply unit includes a battery 4, a solar panel 41 and an adjustable resistor 42; the solar panel 41 is electrically connected to the battery 4, and the electric energy generated by the solar panel is stored in the battery 4, thereby supplying power to the electrical equipment; the battery 4, the adjustable resistor 42 and the anode plate 21 and the cathode plate 22 form a loop, and the electric energy generated by the anode plate 21 and the cathode plate 22 is stored in the battery 4, thereby supplying power to the electrical equipment, and the adjustable resistor 42 adjusts the resistance value according to the wastewater pollutant concentration and the power generation capacity.

[0037] Furthermore, the mixed bacterial liquid includes a mixed bacterial liquid A and a mixed bacterial liquid B; the mixed bacterial liquid A is inoculated in the desulfurization unit 2, and the mixed bacterial liquid B is inoculated in the aerobic unit 3; the mixed bacterial liquid A includes: Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box B, and the mixed bacterial liquid B includes: Nitrosobacter and Nitrobacter.

[0038] The present invention also discloses a microbial electrochemical coupled desulfurization method, comprising the following steps:

[0039] S1: Debugging of microbial electrochemical coupled desulfurization device and acclimation of desulfurization microorganisms, specifically including the following steps:

[0040] S11: adding sodium acetate and trace elements including potassium, calcium, zinc, boron, and chromium to the petrochemical wastewater, mixing them evenly, and then pumping them into the microbial electrochemical coupled desulfurization device through the water inlet. The process is stopped when the petrochemical wastewater fills the entire device.

[0041] S12: Inoculate a mixed bacterial solution of Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box Bacteria into the desulfurization unit. The bacterial count ratio of the four bacterial genera in the bacterial solution is 1:1:1:1, and the bacterial count is not less than 10 8 Inoculate a mixed bacterial solution of Nitrite Bacteria and Nitrate Bacteria into the aerobic unit, with the bacterial count ratio of Nitrite Bacteria to Nitrate Bacteria in the bacterial solution being 1:1 to 1:5, and the bacterial count being no less than 10 7 / mL; then the desulfurization unit and aerobic unit were opened to acclimate the functional microbial flora;

[0042] S13: After 7 to 15 days of acclimation, all wastewater (supernatant) is discharged, and the acclimated desulfurization microorganisms remain in the reactor in the form of activated sludge for further acclimation, and new petrochemical wastewater is pumped in again for a second acclimation of 7 to 15 days; there is a desulfurization effect during the acclimation process, and the entire microbial electrochemical coupled desulfurization device can operate normally. After the second acclimation, the desulfurization activity of the microorganisms can be further improved. After the debugging of the microbial electrochemical coupled desulfurization device is completed, it can treat sulfur-containing wastewater.

[0043] S2: Petrochemical wastewater is pumped in from the water inlet, and then the suspended solids and oil pollutants in the wastewater are effectively removed by the flotation machine and scraper. Floating oil and scum are discharged from the slag outlet, and sediment is discharged from the mud outlet. The hydraulic retention time of the flotation unit is 12 to 24 hours.

[0044] S3: After flotation treatment, wastewater is filtered through microporous partitions and then enters the desulfurization unit. Under an anaerobic environment, organic matter is hydrolyzed and acidified, breaking down into small molecules. Sulfate is oxidized into elemental sulfur by microorganisms and attached to the surface of the anode plate. The electrons generated during the oxidation process are transferred to the cathode via a wire. Under the action of a catalyst, the cathode plate uses oxygen or microorganisms as electron acceptors to oxidize the electrons transferred from the external circuit, while converting the chemical energy in the wastewater into electrical energy and storing it in a battery. The hydraulic retention time of the desulfurization unit is 24 to 48 hours.

[0045] S4: The wastewater treated by the desulfurization unit enters the aerobic unit, where the organic matter and nitrogen-containing substances in the wastewater are further degraded under the action of aeration and microorganisms. The hydraulic retention time of the aerobic unit is 24 to 48 hours, and the wastewater is discharged from the outlet after the treatment meets the standards.

[0046] Furthermore, the method further includes recovering the sulfur element on the anode plate 21 manually or automatically.

[0047] The microbial electrochemical coupled desulfurization device and method are used to treat sulfur-containing wastewater. The water quality indicators during the treatment process are as follows: COD is 2580±65.8mg / L, NH4 + -N is 110.5±21.8mg / L, SO4 2+The water quality indicators after treatment are as follows: COD is 428.5±36.4mg / L, NH4 + -N is 9.5±3.6mg / L, SO4 2+ It is 3.7±0.8 mg / L, which can effectively remove organic matter, sulfide and nitrogen compound in sulfur-containing wastewater.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0049] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A microbial electrochemical coupled desulfurization device, characterized in that: include: An air flotation unit (1), a desulfurization unit (2) and an aerobic unit (3) connected in sequence; The air flotation unit (1) is provided with a suspended matter removal device; An aeration device is provided in the aerobic unit (3); The desulfurization unit (2) and the aerobic unit (3) are filled with mixed bacterial liquid and wastewater; It also includes an energy supply unit, an anode plate (21) and a cathode plate (22); the anode plate (21) and the cathode plate (22) are placed in the mixed bacterial liquid; the energy supply unit is electrically connected to the suspended matter removal device, the aeration device, the anode plate (21) and the cathode plate (22) respectively; A second baffle (6) is provided between the desulfurization unit (2) and the aerobic unit (3), the cathode plate (22) is located in the aerobic unit (3), and the second baffle (6) adopts a proton-free exchange membrane; The energy supply unit comprises a storage battery (4), a solar panel (41) and an adjustable resistor (42); the solar panel (41) is electrically connected to the storage battery (4); the storage battery (4), the adjustable resistor (42) and the anode plate (21) and the cathode plate (22) form a circuit; the adjustable resistor (42) adjusts the resistance value according to the wastewater pollutant concentration and the power generation capacity; The anode plate (21) and the cathode plate (22) are one or more groups; the distance between the anode plate (21) and the cathode plate (22) is 30 cm to 100 cm; the material of the anode plate (21) is carbon felt, carbon cloth or graphite, and the material of the cathode plate (22) is carbon felt, carbon cloth or graphite.

2. The microbial electrochemical coupled desulfurization device according to claim 1, characterized in that: The air flotation unit (1) is further provided with a water inlet (11), a slag outlet (13) and a mud outlet (16), wherein the slag outlet (13) is located at the top of the air flotation unit (1), and the mud outlet (16) is located at the bottom of the air flotation unit (1); The suspended matter removal device comprises an air flotation machine (12) and a scraper (14), wherein the air flotation machine (12) is located at the bottom of the air flotation unit (1), and the scraper (14) is located at the top of the air flotation unit (1). The scraper plate of the scraper (14) reciprocates horizontally, falls when moving close to the slag outlet (13), and is retracted when moving away from the slag outlet (13).

3. The microbial electrochemical coupled desulfurization device according to claim 1, characterized in that: A first baffle (5) is provided between the flotation unit (1) and the desulfurization unit (2), and a filtering device (15) is provided on the upper portion of the first baffle.

4. The microbial electrochemical coupled desulfurization device according to claim 3, characterized in that: The filtering device (15) is a microporous partition or a filter screen, and the pore size of the microporous partition or the filter screen is 0.5-2.0 mm.

5. The microbial electrochemical coupled desulfurization device according to claim 1, characterized in that: The aerobic unit (3) is further provided with a filling port. The aeration device comprises an aerator (31), an aeration pipe (32) and an aerator (33). The aerator (31) is connected to the aerator (33) via the aeration pipe (32). The aerator (33) is located at the bottom of the aerobic unit (3).

6. The microbial electrochemical coupled desulfurization device according to claim 1, characterized in that: The mixed bacterial liquid comprises a mixed bacterial liquid A and a mixed bacterial liquid B; the mixed bacterial liquid A is inoculated in the desulfurization unit (2), and the mixed bacterial liquid B is inoculated in the aerobic unit (3); the mixed bacterial liquid A comprises: Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box B, and the mixed bacterial liquid B comprises: Nitrosobacter and Nitrobacter.

7. A microbial electrochemical coupled desulfurization method, characterized in that: The microbial electrochemical coupled desulfurization device according to any one of claims 1 to 6 comprises the following steps: S1: Debugging of microbial electrochemical coupled desulfurization device and acclimation of desulfurization microorganisms, specifically including the following steps: S11: adding sodium acetate and trace elements including potassium, calcium, zinc, boron, and chromium to the petrochemical wastewater, mixing them evenly, and then pumping them into the microbial electrochemical coupled desulfurization device through the water inlet. The process is stopped when the petrochemical wastewater fills the entire device. S12: Inoculate a mixed bacterial solution of Thiobacillus, Shewanella, Desulfovibrio and Desulfurization Box Bacteria into the desulfurization unit. The bacterial count ratio of the four bacterial genera in the bacterial solution is 1:1:1:1, and the bacterial count is not less than 10 8 Inoculate a mixed bacterial solution of Nitrite Bacteria and Nitrate Bacteria into the aerobic unit, with the bacterial count ratio of Nitrite Bacteria to Nitrate Bacteria in the bacterial solution being 1:1~1:5, and the bacterial count being no less than 10 7 / mL; then the desulfurization unit and aerobic unit were opened to acclimate the functional microbial flora; S13: After acclimation for 7 to 15 days, all wastewater is discharged and new petrochemical wastewater is pumped in for a second acclimation for 7 to 15 days; S2: Petrochemical wastewater is pumped in from the water inlet, and then the suspended solids and oil pollutants in the wastewater are effectively removed by the flotation machine and scraper. Floating oil and scum are discharged from the slag outlet, and sediment is discharged from the mud outlet. The hydraulic retention time of the flotation unit is 12~24h; S3: After flotation treatment, wastewater is filtered through microporous partitions and then enters the desulfurization unit. Under an anaerobic environment, organic matter is hydrolyzed and acidified, breaking down into small molecules. Sulfate is oxidized by microorganisms into elemental sulfur, which adheres to the surface of the anode plate. The electrons generated during the oxidation process are transferred to the cathode via a wire. Under the action of a catalyst, the cathode plate uses oxygen or microorganisms as electron acceptors to oxidize the electrons transferred from the external circuit, while converting the chemical energy in the wastewater into electrical energy and storing it in a battery. The hydraulic retention time of the desulfurization unit is 24-48 hours. S4: The wastewater treated by the desulfurization unit enters the aerobic unit, where the organic matter and nitrogen-containing substances in the wastewater are further degraded under the action of aeration and microorganisms. The hydraulic retention time of the aerobic unit is 24~48h, and the wastewater is discharged from the outlet after the treatment meets the standards.

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