Functional zoning coupled gas lift stirring high-efficiency anaerobic biological treatment device and method

Abstract

The present invention discloses a functional zoning coupled gas lift stirring high-efficiency anaerobic biological treatment device and method, belonging to the field of biological devices for treating organic wastewater. The device is composed of a denitrification functional zone, a sulfur reduction functional zone and a three-phase separation zone, which are interconnected from bottom to top. The middle of the denitrification functional zone is a second reaction chamber inoculated with denitrification sludge, and the middle of the sulfur reduction functional zone is a first reaction chamber inoculated with anaerobic sludge, and an air lift coupling stirring device is arranged in the first reaction chamber. An air distributor is arranged at the bottom of the sulfur reduction functional zone, and the air distributor is connected to the air outlet end of the air inlet pipe, and the air outlet end of the air inlet pipe is connected to the second reaction chamber. An air collecting device is arranged inside the three-phase separation zone, and a guide plate for separating sludge is arranged at the bottom thereof. The device integrates the removal of carbon, nitrogen and sulfur through functional zoning; gas lift coupling stirring is achieved through self-production of gas by the device; the overall device has a compact structure and occupies a small area, and is suitable for coal chemical wastewater treatment.

Description

Technical Field

[0001] The invention belongs to the field of biological devices for treating organic wastewater, and in particular relates to a functional zoning coupled gas lift stirring high-efficiency anaerobic biological treatment device and method. Background Art

[0002] Coal is one of the typical high water consumption industries. The main water-consuming devices such as gasification and air separation units are huge in scale, and the corresponding steam and circulating water consumption is also very large. Taking the common coal-to-oil, coal-to-olefins and coal-to-natural gas as examples, the average water consumption per unit product is about 10, 27 and 6 tons respectively. Therefore, the treatment of coal chemical wastewater has become a bottleneck restricting the development of this industry. Therefore, it is urgent to explore new methods for coal chemical wastewater treatment.

[0003] Coal chemical wastewater has the characteristics of high COD and high ammonia nitrogen. Anaerobic biological treatment of this wastewater has significant advantages. Generally, more than 80% of pollutants can be removed by biological treatment. In the process of biological treatment of wastewater, the anaerobic stage plays an extremely important role. If the anaerobic stage fails to achieve the expected treatment effect, it will bring too much load to the aerobic treatment stage and may even cause damage to the process equipment.

[0004] Denitrification is essentially the biological reduction process of nitrate. In dissimilatory nitrate reduction, there are two pathways: one is to reduce nitrate to ammonia; the other is to reduce nitrate to gaseous nitrogen compounds (mainly nitrogen), which is also called biological denitrification. The denitrification process includes multiple steps involving NO, N2O, and N2. Microorganisms that can reduce nitrate or nitrite and produce N2O and N2 are usually called denitrifying bacteria. There are many types of denitrifying bacteria. Compared with nitrifying bacteria, denitrifying bacteria have fewer electron acceptors, but they use a wider range of energy and carbon sources.

[0005] In the process of anaerobic nitrification, complex organic matter undergoes hydrolysis and fermentation, hydrogen production, acetic acid production, and methanogenesis. The methane produced will float up, and after methanogenesis, the hydrogen removed from various substrates will be merged into the methane. This not only relieves the hydrogen inhibition of fermentation bacteria and hydrogen and acetic acid production bacteria, ensuring the smooth progress of upstream reactions, but also achieves the complete removal of organic matter.

[0006] A portion of the sulfate is reduced to S by sulfate-reducing bacteria (SRB). 2- , and the other part is NH4 + -N is oxidized to NO2 - -N, and the intermediate product NO2 - -N is reduced by anaerobic ammonium-oxidizing bacteria to achieve simultaneous removal. Some studies have reported that no NH4 + -N and SO4 2-However, when COD is greater than 250 mg / L, the sulfate reduction activity continues to increase, which will affect NH4 + - Removal of N.

[0007] Therefore, in view of the complex pollutants in coal chemical wastewater, due to the complex bacterial structure, easy accumulation of toxic intermediates and limited biological metabolic activity during the anaerobic degradation process, it is urgent to develop a new type of efficient anaerobic biological device. Summary of the invention

[0008] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a functional zoning coupled gas lift stirring high-efficiency anaerobic biological treatment device and method.

[0009] The specific technical solutions adopted by the present invention are as follows:

[0010] In a first aspect, the present invention provides a functionally zoned coupled gas lift stirring high-efficiency anaerobic biological treatment device, wherein the anaerobic biological treatment device comprises, from bottom to top, a denitrification functional zone, a sulfur reduction functional zone and a three-phase separation zone which are interconnected.

[0011] The bottom of the denitrification functional area is an inverted cone structure that is convenient for sludge discharge, and the first sludge discharge port is provided at the bottom of the inverted cone structure. A confluence pipe for the confluence of organic matter and nitrate is provided on the inverted cone structure, and the confluence pipe is connected to the nitrate inlet pipe. The middle of the denitrification functional area is the second reaction chamber for inoculating denitrification sludge. A sludge return hopper is provided above the second reaction chamber, and a deflector for separating gas and solid-liquid mixture is provided at the bottom of the sludge return hopper. An outlet pipe for discharging sewage is provided on the sludge return hopper.

[0012] A second mud outlet is provided at the bottom of the sulfur reduction functional area. An air distributor is provided above the second mud outlet, and the air distributor is connected to the air outlet end of the air inlet pipe, and the air inlet end of the air inlet pipe is connected to the top of the denitrification functional area. A water distributor connected to the water inlet pipe is provided above the air distributor, which is conducive to the gas push flow into the water. The first reaction chamber for inoculating anaerobic sludge is located in the middle of the sulfur reduction functional area, and an air lift coupling stirring device is provided in the first reaction chamber. The stirring blades in the air lift coupling stirring device are connected to the stirring motor at the top of the device through the stirring shaft.

[0013] A gas collecting device is provided inside the three-phase separation zone, and an inclined guide plate is provided at the bottom of the gas collecting device. The connection between the bottom of the gas collecting device and the guide plate is located in the center of the solid phase precipitation zone. The outer wall of the three-phase separation zone is connected to one end of the organic matter return pipe, and the position of the organic matter return pipe is higher than the guide plate. The other end of the organic matter return pipe is merged with the nitrate water inlet pipe in the denitrification functional zone and enters the denitrification functional zone through the confluence pipe. An exhaust pipe is provided at the top of the gas collecting device.

[0014] Preferably, the volume ratio of the denitrification functional zone, the sulfur reduction functional zone and the three-phase separation zone is 1.5:2.

[0015] Preferably, the manifold is located at 1 / 3 to 1 / 2 of the height of the inverted cone structure at the bottom of the denitrification functional zone.

[0016] Preferably, the guide in the denitrification functional area is in the shape of an equilateral triangle, and the inclination angle α of the sludge return hopper along the horizontal direction is 50-60°.

[0017] Preferably, the outlet pipe is located at 1 / 2 to 2 / 3 of the height above the bottom of the sludge return hopper. The air inlet end of the air inlet pipe needs to be higher than the horizontal position of the outlet pipe, and the air inlet end of the air inlet pipe is located at 2 / 3 to 3 / 4 above the bottom of the sludge return hopper.

[0018] Preferably, the water inlet pipe is arranged at 1 / 5 to 1 / 4 of the height of the bottom of the sulfur reduction functional area. The air distributor is located between the second mud outlet and the water distributor.

[0019] Preferably, the stirring blade is located at 1 / 2 to 2 / 3 of the height in the middle of the first reaction chamber.

[0020] Preferably, the guide plate has an inclination angle β of 50 to 60° in the horizontal direction.

[0021] Preferably, the centers of the first reaction chamber, the sludge return hopper, the air distributor, the water distributor, the stirring shaft and the gas collecting device are located on the same vertical axis.

[0022] In a second aspect, the present invention provides a method for utilizing the functional zoning coupled air stripping and stirring high-efficiency anaerobic biological treatment device described in the first aspect, which is specifically as follows:

[0023] Denitrification sludge is inoculated in the denitrification functional area, and anaerobic sludge is inoculated in the sulfur reduction functional area. The sewage to be treated enters the water distributor through the water inlet pipe, and the water is evenly distributed through the water distributor. The air inlet pipe receives the mixed gas from the second reaction chamber in the denitrification functional area, and transports the mixed gas to the first reaction chamber in the sulfur reduction functional area through the air distributor.

[0024] In the first reaction chamber, the sulfate in the sewage to be treated is converted into carbon dioxide and hydrogen sulfide gas, and the mixed gas floats up through the guide plate into the gas collecting device and is discharged from the exhaust pipe. The mud-water mixture is divided into sewage and sludge by gravity in the solid phase precipitation area. The sewage passes through the organic matter return pipe, the nitrate inlet pipe, and the confluence pipe in turn into the denitrification functional area. In the second reaction chamber, the nitrate in the sewage is converted into carbon dioxide and nitrogen gas. The mixed gas enters the sulfur reduction functional area through the air inlet pipe to achieve the gas lift effect. The sewage is then discharged from the upper part of the sludge return hopper through the outlet pipe through the guide. The sludge returns to the sulfur reduction functional area through the guide plate.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The anaerobic biological treatment device provided by the present invention is divided into zones vertically inside the reactor by setting functional zones, wherein the denitrification functional zone performs carbon and nitrogen reduction, and the sulfur reduction functional zone performs carbon and sulfur reduction. The device realizes segmented and directional enhancement of pollutant degradation and realizes coupled treatment of carbon, nitrogen and sulfur;

[0027] (2) The N2 and CH4 produced by the denitrification functional zone reaction in the anaerobic biological treatment device provided by the present invention are evenly distributed through the gas distributor, which drives the stirring blades in the sulfur reduction functional zone to rotate, which is beneficial to sewage mixing, saves energy, and can also increase the denitrification rate;

[0028] (3) In the anaerobic biological treatment device provided by the present invention, the guide plate is connected to the gas collecting device, and the organic matter return pipe is higher than the guide plate, which is conducive to the natural sedimentation of sludge and also facilitates gas collection, thus avoiding the problem of blockage of the return pipe;

[0029] In general, the anaerobic biological treatment device provided by the present invention integrates stirring, reaction, precipitation, reflux and gas collection, has a compact structure, saves energy and reduces consumption, and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of the structure of the anaerobic biological treatment device provided by the present application;

[0031] Figure 2 yes Figure 1 aa section view;

[0032] Figure 3 yes Figure 1 Middle bb cross section;

[0033] In the figure: the first mud outlet 1, the conduit 2, the nitrate water inlet pipe 3, the second reaction chamber 4, the water outlet pipe 5, the guide 6, the sludge return bucket 7, the air inlet pipe 8, the second mud outlet 9, the air distributor 10, the water distributor 11, the water inlet pipe 12, the stirring blade 13, the first reaction chamber 14, the stirring shaft 15, the organic matter return pipe 16, the guide plate 17, the gas collecting device 18, the solid phase precipitation area 19, the exhaust pipe 20, and the stirring motor 21. DETAILED DESCRIPTION

[0034] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0035] As a preferred embodiment of the present invention, this embodiment provides Figure 1A functional zoning coupled gas lift stirring high-efficiency anaerobic biological treatment device and method are shown. The anaerobic biological treatment device is composed of a denitrification functional zone I, a sulfur reduction functional zone II and a three-phase separation zone III which are interconnected from bottom to top. In practical application, in order to better achieve the carbon-nitrogen-sulfur coupling treatment effect, the volume ratio of the denitrification functional zone I, the sulfur reduction functional zone II and the three-phase separation zone III is (1-1.5):1.5:2. The various structures and connection methods of the device will be specifically described below.

[0036] The bottom of the denitrification functional zone I is an inverted cone structure, and a first mud outlet 1 is provided at the bottom of the inverted cone structure for regular sludge discharge. A confluence pipe 2 is provided on the inverted cone structure, and the confluence pipe 2 is connected to the nitrate inlet pipe 3 to combine the organic matter return water with the nitrate inlet water to provide the required substrate for the reaction inside the denitrification functional zone I. The confluence pipe 2 is located at 1 / 3 to 1 / 2 of the height of the inverted cone structure at the bottom of the denitrification functional zone I. The inlet pipe 3 can be set at 1 / 2 to 2 / 3 of the height above the bottom of the sludge return hopper 7.

[0037] The middle of the denitrification functional area I is the second reaction chamber 4 inoculated with denitrification sludge. The denitrifying bacteria in the denitrification sludge use organic matter as a carbon source to convert nitrite into nitrogen gas, and at the same time, part of the organic matter is converted into CH4 by the bacteria.

[0038] A sludge return hopper 7 is provided above the second reaction chamber 4, and a flow guide 6 is provided at the bottom of the sludge return hopper 7, and the flow guide 6 is used to separate the gas and the solid-liquid mixture. The flow guide 6 used in this embodiment is an equilateral triangle. The inclination angle α of the sludge return hopper 7 along the horizontal direction is 50 to 60 degrees. An outlet pipe 5 for discharging sewage is provided on the sludge return hopper 7.

[0039] Figure 3 A cross-sectional view of the sulfur reduction functional zone II provided in this embodiment. The first reaction chamber 14 for inoculating anaerobic sludge is located in the middle of the sulfur reduction functional zone II. An air lift coupling stirring device is provided in the first reaction chamber 14, and the air lift coupling stirring device includes a stirring blade 13, a stirring shaft 15 and a stirring motor 21. The stirring blade 15 is located at a height of 1 / 2 to 2 / 3 in the middle of the first reaction chamber 14, and is connected to the stirring motor 21 at the top of the device through the stirring shaft 15.

[0040] A second mud outlet 9 is provided at the bottom of the sulfur reduction functional zone II. Above the second mud outlet 9 is an air distributor 10 connected to the air outlet end of the air inlet pipe 8. The air inlet end of the air inlet pipe 8 is connected to the top of the denitrification functional zone I and is higher than the horizontal position of the water outlet pipe 5. The air inlet end of the air inlet pipe 8 is located 2 / 3 to 3 / 4 above the bottom of the sludge return hopper 7. The gas separated by the guide 6 overflows and enters the sulfur reduction functional zone II through the air inlet pipe 8 and the air distributor 10 in turn to play a gas lift role.

[0041] The functions of the air distributor 10 here are mainly divided into two aspects: on the one hand, the air distributor 10 can push the water flow upward and form a negative pressure at the bottom of the first reaction chamber 14, so that the sewage flows along the reaction chamber and forms an internal circulation; on the other hand, the air distributor 10 can disturb the mud-water mixture and push the stirring blades 13 to rotate, and the self-generated gas plays a role, saving energy while improving the reaction efficiency. In order to achieve better circulation treatment, the air distributor 10 can be set at 1 / 5 to 1 / 4 of the height of the bottom of the first reaction chamber 14.

[0042] A water distributor 11 is provided above the gas distributor 10. The water distributor 11 is connected to the outside through a water inlet pipe 12, and can evenly distribute the sewage to be treated into the first reaction chamber 14. The water inlet pipe 12 is located at a height of 1 / 5 to 1 / 4 of the bottom of the sulfur reduction functional area II. The water distributor 11 is located at 1 / 4 to 1 / 3 of the bottom of the second reaction chamber, slightly higher than the gas distributor 10, in order to ensure that the gas can effectively disturb the reaction chamber without interfering with the mud discharge port.

[0043] After the water is evenly distributed by the water distributor 11, the air inlet pipe 8 will transport the gas produced by the anaerobic reaction in the denitrification functional area I to the first reaction chamber 14 of the sulfur reduction functional area II. In the first reaction chamber 14, under the condition of organic matter, the sulfate-reducing bacteria reduce the sulfate in the sewage to hydrogen sulfide gas, and the organic matter is partially converted into CH4. The gas transported from the denitrification functional area I to the sulfur reduction functional area II drives the stirring blade 13 to rotate, thereby increasing the reaction rate and saving energy and reducing consumption. When the generated gas is not enough to drive the stirring blade 13 to rotate, the stirring motor 21 can be turned on to rotate the stirring blade 13 to promote the reaction.

[0044] Figure 2 A cross-sectional view of the three-phase separation zone III provided for this embodiment. A gas collecting device 18 is provided inside the three-phase separation zone III, and an inclined guide plate 17 is provided at the bottom of the gas collecting device 18, and the guide plate 17 is inclined at an angle β of 50 to 60 degrees in the horizontal direction. The connection between the bottom of the gas collecting device 18 and the guide plate 17 is located in the center of the solid phase precipitation zone 19. The solid phase precipitation zone 19 is a downward tapering structure, and the guide plate 17 is provided at a height of 1 / 4 to 1 / 3 of the bottom. The sludge in the solid phase precipitation zone 19 is precipitated downward through the guide plate 17 and recovered into the first reaction chamber 14 of the sulfur reduction functional zone II.

[0045] The outer wall of the three-phase separation zone III is connected to one end of the organic matter return pipe 16, and the organic matter return pipe 16 is opened at a position higher than the guide plate 17. The other end of the organic matter return pipe 16 is combined with the nitrate water inlet pipe 3 in the denitrification functional zone I, and enters the denitrification functional zone I through the confluence pipe 2. An exhaust pipe 20 is opened on the top of the gas collecting device 18.

[0046] The centers of the first reaction chamber 14, the sludge return hopper 7, the air distributor 10, the water distributor 11, the stirring shaft 15 and the air collecting device 18 are located on the same vertical axis.

[0047] The specific method of using the anaerobic biological treatment device provided in this embodiment to treat sewage is as follows:

[0048] Denitrifying sludge is inoculated in denitrifying functional zone I, and anaerobic sludge is inoculated in sulfur reduction functional zone II to carry out sewage treatment.

[0049] The sewage enters the water distributor 11 through the water inlet pipe 12, and the water is evenly distributed through the water distributor 11. The air inlet pipe 8 receives the gas from the second reaction chamber 4 in the denitrification functional area I and transports the gas upward. Subsequently, the gas is transported by the gas distributor 10 to the first reaction chamber 14 in the sulfur reduction functional area II, driving the stirring blade 13 to rotate to increase the reaction rate. In the first reaction chamber 14, under the condition of organic matter, sulfate-reducing bacteria reduce sulfate in the sewage to hydrogen sulfide gas, and the gas floats up through the guide plate 17. Under the action of gravity, the sewage is separated into gas and solid-liquid mixture. After the mixed gas enters the gas collecting device 18, it is discharged through the exhaust pipe 20, and negative pressure is generated at the same time, forming a circulation in the first reaction chamber 14.

[0050] After the sewage is left to stand in the solid phase precipitation zone 19, it passes through the organic matter return pipe 16 to the denitrification functional zone I, providing a carbon source for the second reaction chamber 4. The sludge separated in the solid phase precipitation zone 19 is precipitated downward through the guide plate 17 and recovered into the first reaction chamber 14 of the sulfur reduction functional zone II. The sludge in the first reaction chamber 14 can be discharged regularly through the second sludge discharge port 9.

[0051] In the denitrification functional area I, the second reaction chamber 4 contains activated sludge containing denitrifying bacteria. The sewage merges with the nitrate inlet pipe 3 through the organic matter return pipe 16, and then enters the second reaction chamber 4 through the confluence pipe 2. This process replenishes the substrate into the second reaction chamber 4. Denitrifying bacteria use organic matter as a carbon source to convert nitrite into nitrogen. At the same time, part of the organic matter is converted into CH4 by the bacteria. The mixed gas disturbs the water body to flow upward. The sewage enters from the bottom of the sludge return hopper 7 through the guide 6 and is discharged through the outlet pipe 5. The mixed gas overflows to both sides and enters the air inlet pipe 8, plays a gas lift role in the sulfur reduction functional area II, and is finally discharged from the gas collecting device 18 through the exhaust pipe 20.

[0052] The anaerobic biological treatment device provided by the present invention integrates the carbon, nitrogen and sulfur removal processes, and couples the three processes of denitrification, sulfur reduction and methanogenesis. In this process, organic matter is used as a carbon source, and nitrite influent is used to provide electron acceptors for denitrification. Microorganisms reduce nitrite in sewage to nitrogen gas through denitrification, and part of the organic matter is converted into methane. After the mixed gas is collected through the air inlet pipe, it is aerated in the first reaction chamber by the air distributor. Sulfate-reducing bacteria use organic matter as a carbon source to reduce sulfate to produce hydrogen sulfide gas. The mixed gas is discharged through the exhaust pipe of the gas collection device to achieve the removal of pollutants from the sewage. The mud-water mixture is treated in the solid phase precipitation zone to make the sludge precipitate again, and then enters the first reaction chamber through the guide device for cyclic reaction.

[0053] Functional zoning and gas lift stirring are arranged in the anaerobic biological treatment device. By controlling the balance of organic matter consumption, the two functional areas can reasonably utilize the substrate, thereby saving energy and reducing consumption while improving the sewage treatment efficiency, which is beneficial to the efficient and enhanced detoxification of bio-refractory wastewater and is suitable for treating coal chemical wastewater.

[0054] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device, characterized in that: The anaerobic biological treatment device comprises, from bottom to top, a denitrification functional zone (I), a sulfur reduction functional zone (II) and a three-phase separation zone (III) which are interconnected; The bottom of the denitrification functional area (I) is an inverted cone structure for easy sludge discharge, and a first sludge discharge port (1) is provided at the bottom of the inverted cone structure; a confluence pipe (2) for the confluence of organic matter and nitrate is provided on the inverted cone structure, and the confluence pipe (2) is connected to a nitrate water inlet pipe (3); a second reaction chamber (4) inoculated with denitrification sludge is provided in the middle of the denitrification functional area (I); a sludge return hopper (7) is provided above the second reaction chamber (4), and a flow guide (6) for separating gas and solid-liquid mixture is provided at the bottom of the sludge return hopper (7); an outlet pipe (5) for discharging sewage is provided on the sludge return hopper (7); The bottom of the sulfur reduction functional zone (II) is provided with a second mud discharge port (9); an air distributor (10) is provided above the second mud discharge port (9), the air distributor (10) is connected to the air outlet end of the air inlet pipe (8), and the air inlet end of the air inlet pipe (8) is connected to the top of the denitrification functional zone (I); a water distributor (11) connected to the water inlet pipe (12) is provided above the air distributor (10) to facilitate gas push flow into the water; the middle of the sulfur reduction functional zone (II) is a first reaction chamber (14) inoculated with anaerobic sludge, and an air lift coupling stirring device is provided in the first reaction chamber (14); The stirring blade (13) in the air lift coupling stirring device is connected to the stirring motor (21) at the top of the device through a stirring shaft (15); The three-phase separation zone (III) is provided with a gas collecting device (18) inside, and an inclined guide plate (17) is provided at the bottom of the gas collecting device (18); the portion where the bottom of the gas collecting device (18) is connected to the guide plate (17) is located in the center of the solid phase precipitation zone (19); the outer wall of the three-phase separation zone (III) is connected to one end of the organic matter return pipe (16), and the position of the organic matter return pipe (16) is higher than the guide plate (17); the other end of the organic matter return pipe (16) is combined with the nitrate water inlet pipe (3) in the denitrification functional zone (I), and enters the denitrification functional zone (I) through the confluence pipe (2); and an exhaust pipe (20) is provided at the top of the gas collecting device (18).

2. The functional zoning coupled air stripping and stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The volume ratio of the denitrification functional zone (I), the sulfur reduction functional zone (II) and the three-phase separation zone (III) is (1-1.5):1.5:

2.

3. The functional zoning coupled air stripping and stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The manifold (2) is located at 1 / 3 to 1 / 2 of the height of the inverted cone structure at the bottom of the denitrification functional zone (I).

4. The functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The guide device (6) in the denitrification functional area (I) is an equilateral triangle, and the inclination angle α of the sludge return bucket (7) along the horizontal direction is 50-60°.

5. The functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The water outlet pipe (5) is located at a height of 1 / 2 to 2 / 3 above the bottom of the sludge return hopper (7); the air inlet end of the air inlet pipe (8) needs to be higher than the horizontal position of the water outlet pipe (5), and the air inlet end of the air inlet pipe (8) is located at a height of 2 / 3 to 3 / 4 above the bottom of the sludge return hopper (7).

6. The functional zoning coupled air stripping and stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The water inlet pipe (12) is arranged at 1 / 5 to 1 / 4 of the height of the bottom of the sulfur reduction functional area (II); and the air distributor is located between the second mud discharge port (9) and the water distributor (11).

7. The functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The stirring blade (15) is located at 1 / 2 to 2 / 3 of the height in the middle of the first reaction chamber (14).

8. The functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The guide plate (17) has an inclination angle β of 50 to 60 degrees in the horizontal direction.

9. The functional zoning coupled air lift stirring high-efficiency anaerobic biological treatment device according to claim 1 is characterized in that: The centers of the first reaction chamber (14), the sludge return hopper (7), the air distributor (10), the water distributor (11), the stirring shaft (15), and the air collecting device (18) are located on the same vertical axis.

10. A method of utilizing the functional zoning coupled air stripping and stirring high-efficiency anaerobic biological treatment device according to any one of claims 1 to 9, characterized in that: The details are as follows: Denitrifying sludge is inoculated in the denitrifying functional zone (I), and anaerobic sludge is inoculated in the sulfur reducing functional zone (II); the sewage to be treated enters the water distributor (11) through the water inlet pipe (12), and the water is evenly distributed through the water distributor (3); the air inlet pipe (8) receives the mixed gas from the second reaction chamber (4) in the denitrifying functional zone (I), and transports the mixed gas to the first reaction chamber (14) of the sulfur reducing functional zone (II) through the air distributor (10); In the first reaction chamber (14), sulfate in the wastewater to be treated is converted into carbon dioxide and hydrogen sulfide gas, and the mixed gas floats upward through the guide plate (17) and enters the gas collecting device (18) and is discharged from the exhaust pipe (20); the mud-water mixture is separated into wastewater and sludge by gravity in the solid phase precipitation zone (19); The sewage enters the denitrification functional area (I) through the organic matter return pipe (16), the nitrate inlet pipe (3) and the confluence pipe (2) in sequence, and the nitrate in the sewage is converted into carbon dioxide and nitrogen gas in the second reaction chamber (4); the mixed gas enters the sulfur reduction functional area (II) through the air inlet pipe (8) to achieve the gas lift effect; the sewage is then discharged from the upper part of the sludge return hopper (7) through the outlet pipe (5) through the guide device (6); the sludge returns to the sulfur reduction functional area (II) through the guide plate (17).

Images