Anaerobic micro-aerobic reaction system without three-phase separator

Abstract

The present application relates to a kind of anaerobic micro-aerobic reaction systems without three-phase separator, including reactor and external circulation oxygenation unit, the reactor is from bottom to top including water distributor, secondary sludge-water separator, primary sludge-water separator and exhaust port, the bottom of primary sludge-water separator is connected secondary sludge-water separator by flow guide pipe, for the sludge separated by primary sludge-water separator is input secondary sludge-water separator, the bottom of secondary sludge-water separator is equipped with external circulation pipe, external circulation pipe connects external circulation oxygenation unit, for the sludge separated by secondary sludge-water separator is input external circulation oxygenation unit;The upper portion of secondary sludge-water separator is equipped with drain pipe, for output water production;The external circulation oxygenation unit includes jet, the inlet of jet is connected with external circulation pipe and air pipe respectively, and the outlet is connected with water inlet pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of anaerobic reaction equipment, specifically relating to an anaerobic micro-oxygen reaction system without a three-phase separator. Background Technology

[0002] Anaerobic biological treatment technology is characterized by its small footprint, high organic matter removal efficiency, and the ability to obtain biomethane. Through continuous technological improvements and innovations, three generations of mature anaerobic reactors have been developed. The third generation of anaerobic reactors is represented by EGSB and IC reactors. The IC reactor, in particular, combines two UASB reactors in series with an internal circulation system, significantly improving sludge retention capacity and attracting considerable attention in the industry. However, the operation and control of the IC reactor is more challenging, and the three-phase separator becomes a key factor in its efficient and stable operation. The double-layer three-phase separator design is not only costly to manufacture but also occupies a large internal space. Furthermore, in practical use, an improperly designed three-phase separator can lead to poor sludge-water-gas separation, severely impacting reactor efficiency.

[0003] Meanwhile, traditional anaerobic reactors are no longer able to completely degrade pollutants in the increasingly common wastewater containing recalcitrant and toxic substances under strict anaerobic conditions, and the wastewater treatment effect needs to be improved. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an anaerobic micro-oxygen reaction system without a three-phase separator. By adding a small amount of oxygen to the reactor, anaerobic bacteria, aerobic bacteria, and facultative bacteria can coexist due to the participation of trace oxygen. This allows oxidation and reduction reactions to occur simultaneously within the reactor, along with aerobic respiration and methanogenesis. This system can effectively degrade some substances that are difficult to degrade under purely anaerobic conditions and enhance the activity of methanogenic bacteria.

[0005] The anaerobic micro-aerobic reaction system without a three-phase separator includes a reactor and an external circulation aeration unit. The reactor, from bottom to top, includes a water distributor, a secondary sludge-water separator, a primary sludge-water separator, and an exhaust port. The bottom of the primary sludge-water separator is connected to the secondary sludge-water separator via a guide pipe, used to input the sludge separated by the primary sludge-water separator into the secondary sludge-water separator. The bottom of the secondary sludge-water separator is equipped with an external circulation pipe, which is connected to the external circulation aeration unit, used to input the sludge separated by the secondary sludge-water separator into the external circulation aeration unit. The upper part of the secondary sludge-water separator is equipped with a drain pipe for outputting product water.

[0006] The external circulation oxygenation unit includes an ejector, the inlet of which is connected to the external circulation pipe and the air pipe respectively, and the outlet is connected to the water inlet pipe.

[0007] The anaerobic micro-aerobic reactor system described in this invention has a simple and compact structure. The reactor is packing-free and contains anaerobic microorganisms and activated sludge. Based on the IC reactor, the original two-stage three-phase separator is eliminated, and a two-stage sludge-water separator is used to enhance the sludge-water separation effect. Forced sludge recirculation is achieved through an external circulation pipe and an external circulation aeration unit, preventing sludge loss, ensuring sludge concentration within the reactor, improving the reactor's resistance to shock loads, and effectively preventing sludge calcification. The external circulation aeration unit uses an ejector to mix and spray the reactor's output sludge-water mixture with air, improving dissolved oxygen efficiency and altering the oxygen content of the recirculated sludge-water mixture to maintain a micro-aerobic environment within the reactor. This reduces the oxidation of some reducing substances (such as H2S) and volatile fatty acids (VFA), as well as the accumulation of intermediate products such as soluble microbial products (SMP), thereby reducing the COD of the reactor's permeate and increasing the activity of methanogenic bacteria.

[0008] The primary mud-water separator of the present invention can take the following two forms.

[0009] Optionally, the primary sludge-water separator is located at the top of the reactor and includes at least two first separators, which from top to bottom include an absorption tank, an inclined plate separation zone, and a sludge settling zone.

[0010] The top surface of the absorption tank is left unopened to allow wastewater from the upper part of the reactor to enter the first separator from the top surface of the absorption tank; the side of the absorption tank is a curved surface, and the height of the end of the curved surface near the inner wall of the reactor is lower than the height of the end near the central axis of the reactor.

[0011] The inclined plate separation zone is equipped with several parallel inclined plates for separating the incoming sewage into mud and water. The separated sludge and water enter the guide pipe through the sludge settling zone and then enter the secondary mud-water separator for further separation.

[0012] Optionally, the primary sludge-water separator is located at the top of the reactor and includes at least two first separators. Each first separator includes, from top to bottom, a top cover, an outlet, an inclined plate separation zone, several inlets, and a sludge settling zone. The top cover is a conical cover plate that covers the inclined plate separation zone and is hollow inside.

[0013] The outlet is connected to a drain pipe for discharging the water obtained from the mud-water separation.

[0014] The inclined plate separation zone is equipped with several parallel inclined plates for separating the sludge from the wastewater entering through the inlet. The separated sludge enters the guide pipe through the sludge settling zone and then enters the secondary sludge separator.

[0015] Further optionally, the water outlet is located on the side wall of the first separator near the drain pipe; a plurality of water inlets are evenly distributed along the circumference of the first separator.

[0016] Alternatively, the bottom of the sludge settling zone is provided with a conical sidewall, which facilitates the sludge settling along the conical sidewall.

[0017] Optionally, the side wall of the first separator is provided with a water inlet groove, the water inlet groove including a baffle plate and a trough plate connected to each other, the baffle plate being parallel to the side wall of the first separator, and the trough plate being connected between the baffle plate and the side wall of the first separator;

[0018] The water inlet corresponds to the bottom of the water inlet tank, and the top of the baffle plate corresponds to the middle of the lowest inclined plate in the inclined plate separation area, so that the water entering the first separator from several water inlets is first evenly distributed along the circumference of the first separator in the water inlet tank, and then overflows to the inclined plate separation area.

[0019] Optionally, the water inlet tank is provided with at least one openable and closable sludge discharge opening for discharging sludge accumulated in the water inlet tank.

[0020] Optionally, the inclined plate separation area is a cone shape with a smaller top and a larger bottom, and has several layers of inclined plates from top to bottom, each layer of inclined plates including several parallel inclined plates.

[0021] Optionally, a water outlet area is provided above the inclined plate separation area, the shape of which matches the shape of the inclined plate separation area, and the water outlet area and the inclined plate separation area are separated by a partition plate; a secondary water outlet is provided at the top of the inclined plate separation area and is connected to the water outlet area through the secondary water outlet for inputting the water separated by the inclined plate separation area into the water outlet area;

[0022] The isolation plate has an upwardly protruding, continuous spiral water guide plate on the side facing the water outlet area, and the water outlet is located at the bottom of the water outlet area.

[0023] Optionally, the secondary mud-water separator is located in the lower middle part of the reactor and includes at least one second separator, which is a cyclone separator. The top of the second separator is connected to the guide pipe, and the side wall of the second separator is connected to a drain pipe. The drain pipe passes through the side wall of the upper part of the reactor and extends to the outside for outputting product water.

[0024] Optionally, the external circulation oxygenation unit includes a circulating water pump, an ejector, and a mixing pipe connected in sequence;

[0025] The jet ejector includes a liquid inlet, a suction chamber, a diffuser, and a nozzle. The external circulation pipe is connected to the liquid inlet of the jet ejector via a circulating water pump, the air pipe is connected to the gas inlet of the suction chamber, and the nozzle is connected to the water inlet pipe via a mixing pipe.

[0026] Optionally, a mixing tank is provided between the mixing pipe and the inlet pipe to fully mix the wastewater inlet with the oxygenated sludge obtained from the external circulation oxygenation unit.

[0027] Optionally, the reactor is equipped with an ORP detector to detect the dissolved oxygen level in the reactor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an anaerobic micro-aerobic reaction system without a three-phase separator.

[0029] Figure 2 This is a schematic diagram of another type of first separator.

[0030] In the attached diagram, 1-reactor, 2-water distributor, 3-secondary sludge-water separator, 4-primary sludge-water separator, 5-exhaust port, 6-guide pipe, 7-external circulation pipe, 8-drain pipe, 9-jet injector, 10-air pipe, 11-inlet pipe, 12-first separator, 13-top cover, 14-outlet, 15-inclined plate separation zone, 16-inlet, 17-sludge settling zone, 18-absorption tank, 19-inclined plate, 20-inlet tank, 21-baffle plate, 22-tank plate, 23-outlet zone, 24-isolation plate, 25-secondary outlet, 26-second separator, 27-circulating water pump, 28-mixing pipe, 29-mixing water tank, 30-ORP detector. Detailed Implementation

[0031] This embodiment provides an anaerobic micro-aerobic reaction system without a three-phase separator, such as... Figures 1-2 As shown, the reactor includes a reactor 1 and an external circulation aeration unit. The reactor 1, from bottom to top, includes a water distributor 2, a secondary sludge-water separator 3, a primary sludge-water separator 4, and an exhaust port 5. The bottom of the primary sludge-water separator 4 is connected to the secondary sludge-water separator 3 via a guide pipe 6, used to input the sludge separated by the primary sludge-water separator 4 into the secondary sludge-water separator 3. The bottom of the secondary sludge-water separator 3 is equipped with an external circulation pipe 7, which is connected to the external circulation aeration unit, used to input the sludge separated by the secondary sludge-water separator 3 into the external circulation aeration unit. The upper part of the secondary sludge-water separator 3 is equipped with a drain pipe 8 for outputting produced water.

[0032] The external circulation oxygenation unit includes an ejector 9, the inlet of which is connected to the external circulation pipe 7 and the air pipe 10, and the outlet is connected to the water inlet pipe 11.

[0033] Optionally, the reactor 1 is cylindrical with a conical top and is sealed, so that the gas produced in the reactor 1 is discharged only through the exhaust port 5.

[0034] The primary mud-water separator 4 of the present invention can take the following two forms.

[0035] Optionally, the primary sludge separator 4 is located at the upper part of the reactor 1, for example at 2 / 3 of the height of the reactor 1, and includes at least two first separators 12, which from top to bottom include an absorption tank 18, an inclined plate separation zone 15 and a sludge settling zone 17.

[0036] The top surface of the absorption tank 18 is empty, which allows the sewage in the upper part of the reactor to enter the first separator 12 from the top surface of the absorption tank; the side of the absorption tank 18 is a curved surface, and the height of the end of the curved surface near the inner wall of the reactor is lower than the height of the end near the central axis of the reactor, that is, the longitudinal section of the curved surface is a right triangle.

[0037] The inclined plate separation zone 15 is provided with several parallel inclined plates 19 for separating the incoming sewage into mud and water. The separated sludge and water enter the guide pipe 6 through the sludge settling zone 17 and then enter the secondary mud-water separator 3 for further separation.

[0038] Optionally, the top opening of the absorption tank 18 is inclined at an angle of 15-45°, which can avoid the disturbance of the rising biogas flow inside the reactor caused by the turbulence formed when the mud-water mixture enters the first separator 12 under the suction action of the circulating water pump 27 outside the reactor.

[0039] Alternatively, the bottom of the sludge settling zone 17 is provided with a conical sidewall, which facilitates the sludge settling along the conical sidewall.

[0040] Optionally, the primary sludge-water separator 4 is located at the upper part of the reactor 1, for example at 2 / 3 of the height of the reactor 1, and includes at least two first separators 12. The first separator 12 includes, from top to bottom, a top cover 13, an outlet 14, an inclined plate separation zone 15, several inlets 16 and a sludge settling zone 17. The top cover 13 is a conical cover plate that covers the inclined plate separation zone 15 and is hollow inside.

[0041] The outlet 14 is connected to the drain pipe 8, which is used to discharge the water obtained by mud-water separation.

[0042] The inclined plate separation zone 15 is provided with several parallel inclined plates 19 for separating the sludge from the sewage entering through the inlet 16. The separated sludge enters the guide pipe 6 through the sludge settling zone 17 and then enters the secondary sludge separator 3.

[0043] Further optionally, the upper surface of the top cover 13 is tilted at an angle of 15-45°.

[0044] Alternatively, the outlet 14 is located on the side wall of the first separator 12 near the drain pipe 8; a plurality of inlets 16 are evenly distributed along the circumference of the first separator 12.

[0045] Alternatively, the bottom of the sludge settling zone 17 is provided with a conical sidewall, which facilitates the sludge settling along the conical sidewall.

[0046] Optionally, the side wall of the first separator 12 is provided with a water inlet groove 20. The water inlet groove 20 includes a baffle plate 21 and a groove plate 22 connected to each other. The baffle plate 21 is parallel to the side wall of the first separator 12, and the groove plate 22 is connected between the baffle plate 21 and the side wall of the first separator 12.

[0047] The water inlet 16 corresponds to the bottom of the water inlet trough 20, and the top of the baffle plate 21 corresponds to the middle of the lowest inclined plate 19 of the inclined plate separation area 15, so that the water entering the first separator 12 from several water inlets 16 is first evenly distributed along the circumference of the first separator 12 in the water inlet trough 20, and then overflows to the inclined plate separation area 15.

[0048] Optionally, the inlet tank 20 is provided with at least one openable and closable sludge discharge opening (not shown) for discharging the sludge accumulated in the inlet tank 20; one end of the trough plate 22 corresponding to the sludge discharge opening is rotatably connected to the side wall of the first separator 12, and the other end contacts the corresponding baffle plate 21. When the inlet tank 20 needs to discharge sludge (when the water inlet of the first separator 12 is not smooth), the control device controls the trough plate 22 corresponding to the sludge discharge opening to rotate and open. The impact of the water entering the inlet tank 20 through the inlet 16 is used to discharge the accumulated sludge from the sludge discharge opening, and then slides along the side wall of the first separator 12 to the sludge settling area 17.

[0049] Optionally, the inclined plate separation zone 15 is a cone shape, smaller at the top and larger at the bottom, and has several layers of inclined plates 19 arranged from top to bottom. Each layer of inclined plates 19 includes several parallel inclined plates 19 arranged side by side. Since the water entering the first separator 12 forms a uniform water flow around the water inlet tank 20 and overflows from the top of the water inlet tank 20 to the inclined plate separation zone 15, a water flow from the periphery to the center and from bottom to top is formed. This water flow, combined with the conical distribution of the inclined plates 19 in the inclined plate separation zone 15, can make full use of the limited space and the limited number of inclined plates 19 in the inclined plate separation zone 15 to achieve a better separation effect.

[0050] Optionally, a water outlet area 23 is provided above the inclined plate separation area 15. The shape of the water outlet area 23 matches the shape of the inclined plate separation area 15. The water outlet area 23 and the inclined plate separation area 15 are separated by a partition plate 24. A secondary water outlet 25 is provided at the top of the inclined plate separation area 15 and is connected to the water outlet area 23 through the secondary water outlet 25, for inputting the water separated by the inclined plate separation area 15 into the water outlet area 23.

[0051] The isolation plate 24 has an upwardly protruding continuous spiral water guide plate (not shown) on the side facing the water outlet area 23, and the water outlet 14 is located at the bottom of the water outlet area 23. The top cover 13 is located above the water outlet area 23.

[0052] The inclined plate separation zone 15 and the water outlet zone 23 of the present invention are complementary in shape and make maximum use of the internal space of the upper part of the first separator 12. After the water after mud-water separation enters the water outlet zone 23, it flows downward along the spiral water guide channel formed by the water guide plate to further separate the sludge. Then the water is discharged from the water outlet 14 to the drain pipe 8. A small amount of split sludge can be left in the water guide channel for unified cleaning.

[0053] Optionally, the exhaust port 5 of the reactor 1 is connected to a vacuum pump for drawing air outward, which facilitates the overflow of gas from the water body in the upper part of the reactor 1.

[0054] Optionally, the secondary mud-water separator 3 is located in the lower middle part of the reactor 1, for example, at 1 / 3 of the height of the reactor 1, and includes at least one second separator 26. The second separator 26 is a cyclone separator. The top of the second separator 26 is connected to the guide pipe 6, and the side wall of the second separator 26 is connected to the drain pipe 8. The drain pipe 8 passes through the side wall of the upper part of the reactor 1 and extends to the outside for outputting product water.

[0055] Optionally, the secondary sludge separator 3 can be configured with two or four second separators 26 symmetrically arranged. When two second separators 26 are used, they are arranged in parallel at the same height with the center line of reactor 1 as the axis of symmetry. When four second separators 26 are used, they are arranged at the same height with the center line of reactor 1 as the axis of symmetry, intersecting each other at a 90° angle on the horizontal plane. Each second separator 26 has a guide pipe 6 at its top.

[0056] Optionally, the primary sludge separator 4 can be configured with two or four first separators 12 arranged symmetrically. When two first separators 12 are used, they are arranged in parallel at the same height with the center line of the reactor 1 as the axis of symmetry. When four first separators 12 are used, they are arranged at the same height with the center line of the reactor 1 as the axis of symmetry, intersecting each other at a 90° angle on the horizontal plane. Each first separator 12 has a corresponding guide pipe 6 at its bottom.

[0057] The number of the first separator 12 and the second separator 26 can be the same or different, and can be flexibly set according to the actual reactor volume.

[0058] Optionally, the external circulation oxygenation unit includes a circulating water pump 27, an ejector 9, and a mixing pipe 28 connected in sequence;

[0059] The jet injector 9 includes a liquid inlet, a suction chamber, a diffuser pipe, and a nozzle. The external circulation pipe 7 is connected to the liquid inlet of the jet injector 9 via a circulating water pump 27. The air pipe 10 is connected to the gas inlet of the suction chamber. The nozzle is connected to the water inlet pipe 11 via a mixing pipe 28. By utilizing the jet negative pressure principle, air is drawn in, effectively preventing blockage of the jet injector 9 itself and the pipeline between the jet injector 9 and the water inlet pipe 11. The water inlet pipe 11 is connected to the inlet of the water distributor 2 to input wastewater into the reactor 1.

[0060] The external circulation pipe 7 feeds the sludge and a small amount of water separated by the secondary sludge-water separator 3 into a jet pump. The jet pump increases the fluid velocity and generates negative pressure by narrowing the flow channel, attracting air from the air pipe 10. The air mixes with the sludge-water mixture within the jet pump, increasing the dissolved oxygen content. This mixture is then fed into the inlet pipe 11, mixed with the incoming water, and finally fed into the reactor 1, where it is evenly distributed via the water distributor 2. Simultaneously, by aerating the circulating sludge and mixing it with the incoming wastewater, the risk of system explosion due to uneven aeration or excessive aeration, which can occur when directly aerating the reactor 1, is avoided.

[0061] Optionally, a mixing tank 29 is provided between the mixing pipe 28 and the inlet pipe 11 to fully mix the sewage inlet with the oxygenated sludge obtained from the external circulation oxygenation unit.

[0062] Optionally, the reactor 1 is equipped with an ORP detector 30 to detect the dissolved oxygen content of the reactor 1; the ejector 9 is connected to an electric valve and automatically controls and adjusts the intake air volume according to the ORP value of the reactor 1. In particular, the ORP is kept within the range of -200±100mv, the intake air volume is reduced when the ORP>-100mv, and no air is intakeed when the ORP>-50mv.

[0063] Optionally, an ORP detector 30 is installed on the pipeline of the external circulation aeration unit to detect the dissolved oxygen content of the mud water after treatment by the external circulation aeration unit.

[0064] The water distributor 2 can be a conventional water distributor 2, such as a jet water distributor 2.

[0065] The working principle of the anaerobic micro-aerobic reaction system without a three-phase separator described in this invention is as follows:

[0066] The reactor contains sludge containing anaerobic, aerobic, and facultative bacteria. Wastewater enters through inlet pipe 11 and mixes with oxygenated sludge returned from mixing pipe 28 before entering the distributor 2 of reactor 1, providing a micro-aerobic environment. Pollutants in the wastewater undergo a micro-aerobic reaction, producing methane. The resulting sludge-water mixture passes through a primary sludge-water separator 4 and a secondary sludge-water separator 3 for separation. Sludge and a small amount of water enter the ejector 9 through external circulation pipe 7, where air is drawn in before returning to reactor 1 through mixing pipe 28 and inlet pipe 11. The special structure of the ejector 9's nozzle, suction chamber, and diffuser creates a flushing effect to prevent clogging. Simultaneously, an ORP detector 30 in reactor 1 measures the ORP value, and the ejector 9 automatically adjusts the air intake based on the ORP value to maintain a micro-aerobic environment within reactor 1. The treated wastewater is discharged through drain pipe 8, and the biogas produced within reactor 1 is discharged through exhaust port 5.

Claims

1. An anaerobic micro-aerobic reaction system without a three-phase separator, characterized in that, The system includes a reactor and an external circulation aeration unit. The reactor, from bottom to top, includes a water distributor, a secondary sludge-water separator, a primary sludge-water separator, and an exhaust port. The bottom of the primary sludge-water separator is connected to the secondary sludge-water separator via a guide pipe, used to input the sludge separated by the primary sludge-water separator into the secondary sludge-water separator. The bottom of the secondary sludge-water separator is equipped with an external circulation pipe, which is connected to the external circulation aeration unit, used to input the sludge separated by the secondary sludge-water separator into the external circulation aeration unit. The upper part of the secondary sludge-water separator is equipped with a drain pipe for outputting product water. The external circulation oxygenation unit includes an ejector, the inlet of which is connected to the external circulation pipe and the air pipe respectively, and the outlet is connected to the water inlet pipe; The primary sludge-water separator is located at the top of the reactor and includes at least two first separators. Each first separator includes, from top to bottom, a top cover, an outlet, an inclined plate separation zone, several inlets, and a sludge settling zone. The top cover is a conical cover plate that covers the inclined plate separation zone and is hollow inside. The outlet is connected to a drain pipe to discharge the water obtained from the mud-water separation. The inclined plate separation zone is equipped with several parallel inclined plates for separating the sludge from the wastewater entering through the inlet. The separated sludge enters the guide pipe through the sludge settling zone and then enters the secondary sludge separator. The outlet is located on the side wall of the first separator near the drain pipe; several inlets are evenly distributed around the circumference of the first separator. The bottom of the sludge settling zone is provided with a conical sidewall, which facilitates the sludge settling along the conical sidewall; The side wall of the first separator is provided with a water inlet groove. The water inlet groove includes a baffle plate and a trough plate connected to each other. The baffle plate is parallel to the side wall of the first separator, and the trough plate is connected between the baffle plate and the side wall of the first separator. The water inlet corresponds to the bottom of the water inlet tank, and the top of the baffle plate corresponds to the middle of the lowest inclined plate in the inclined plate separation area, so that the water entering the first separator from several water inlets is first evenly distributed along the circumference of the first separator in the water inlet tank, and then overflows to the inclined plate separation area. Above the inclined plate separation zone is a water outlet zone, the shape of which matches the shape of the inclined plate separation zone. The water outlet zone and the inclined plate separation zone are separated by a partition plate. The top of the inclined plate separation zone is provided with a secondary water outlet, which is connected to the water outlet zone to input the water separated by the inclined plate separation zone into the water outlet zone. The isolation plate has an upwardly protruding, continuous spiral water guide plate on the side facing the water outlet area, and the water outlet is located at the bottom of the water outlet area.

2. The anaerobic micro-aerobic reaction system without a three-phase separator according to claim 1, characterized in that, The inclined plate separation area is a cone shape with a smaller top and a larger bottom, and has several layers of inclined plates from top to bottom. Each inclined plate layer includes several parallel inclined plates arranged side by side.

3. The anaerobic micro-aerobic reaction system without a three-phase separator according to claim 1, characterized in that, The secondary mud-water separator is located in the middle and lower part of the reactor and includes at least one second separator, which is a cyclone separator. The top of the second separator is connected to the guide pipe, and the side wall of the second separator is connected to the drain pipe. The drain pipe passes through the side wall of the upper part of the reactor and extends to the outside for outputting product water.

4. The anaerobic micro-aerobic reaction system without a three-phase separator according to claim 1, characterized in that, The external circulation oxygenation unit includes a circulating water pump, an ejector, and a mixing pipe connected in sequence. The jet ejector includes a liquid inlet, a suction chamber, a diffuser, and a nozzle. The external circulation pipe is connected to the liquid inlet of the jet ejector via a circulating water pump, the air pipe is connected to the gas inlet of the suction chamber, and the nozzle is connected to the water inlet pipe via a mixing pipe.

5. The anaerobic micro-aerobic reaction system without a three-phase separator according to claim 4, characterized in that, A mixing tank is provided between the mixing pipe and the inlet pipe to fully mix the sewage inlet with the oxygenated sludge obtained from the external circulation oxygenation unit.

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