Integrated anaerobic-anoxic-aerobic reaction tank

Abstract

The invention relates to an integrated anaerobic-anoxic-aerobic reaction tank which comprises an upper biochemical treatment area and a lower settling area, the biochemical treatment area is cylindrical and comprises an anaerobic area, an anoxic area and an aerobic area from inside to outside, the anaerobic area is of a jacket layer structure and is divided into an inner area and an outer area, wastewater is input into the bottom of the inner area, and wastewater is input into the bottom of the anoxic area; the circulating flow can be realized between the inner area and the outer area; the top of the outer zone is communicated with the anoxic zone, a plurality of circles of guide plates are arranged in the anoxic zone, so that wastewater can flow up and down in the anoxic zone along the guide plates, and the top of the anoxic zone is communicated with the aerobic zone; an overflow weir is arranged on the outermost side of the aerobic zone and is connected with the settling zone through a water outlet pipe; the bottom of the settling zone is connected with the anoxic zone through a return pipe; an anaerobic biochemical cage is arranged in the anaerobic zone and is used for containing anaerobic granular sludge, the loss of a large amount of sludge is avoided, the top of the anaerobic biochemical cage spans the top of the inner zone, and the bottom of the anaerobic biochemical cage spans the bottom of the inner zone, so that the granular sludge can circularly flow between the inner zone and the outer zone in the anaerobic biochemical cage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to an integrated anaerobic-anoxic-aerobic reaction tank. BACKGROUND

[0002] With the development of industrial construction and the improvement of urban and rural living standards in China, the discharge amount of industrial wastewater and domestic sewage is huge, and water treatment, as a mature industry, undertakes the heavy task of sewage treatment. The biological method is the most economical and environmentally friendly way to remove organic matter in wastewater and is widely used in the treatment of various wastewater or in the wastewater treatment process. The biological method mainly includes aerobic, anoxic and anaerobic processes, which utilize the different oxygen requirements of different microorganisms for separate cultivation to form different types of activated sludge. Different microorganisms act on organic matter in wastewater in different forms and can degrade different types of organic pollutants. In the field of wastewater treatment, aerobic, anoxic and anaerobic processes are flexibly applied according to the types and contents of pollutants in wastewater. In particular, for high-concentration organic wastewater, the anaerobic, anoxic and aerobic processes are mainly combined. However, at present, the three processes are mainly carried out in three separate tank bodies, which occupies a large area and has high investment and operation costs. If the three processes are combined in one tank body, the problem of sludge loss is also faced. SUMMARY

[0003] In view of the above problems, the application provides an integrated anaerobic-anoxic-aerobic reaction tank, which comprises a biochemical treatment zone at the upper part and a sedimentation zone at the lower part, the biochemical treatment zone is cylindrical and comprises an anaerobic zone, an anoxic zone and an aerobic zone from inside to outside, the anaerobic zone is a sleeve structure and is divided into an inner zone and an outer zone, wastewater is input into the bottom of the inner zone and can circulate between the inner zone and the outer zone; the top of the outer zone is connected to the anoxic zone, and the wastewater treated by the anaerobic zone is overflowed to the anoxic zone;

[0004] A plurality of guide plates are arranged in the anoxic zone, so that the wastewater can flow up and down in the anoxic zone along the guide plates, the top of the anoxic zone is connected to the aerobic zone, and the wastewater treated by the anoxic zone is overflowed to the aerobic zone; an overflow weir is arranged at the outermost side of the aerobic zone, and the overflow weir is connected to the sedimentation zone through a water outlet pipe; the bottom of the sedimentation zone is connected to the anoxic zone through a reflux pipe for sludge reflux;

[0005] An anaerobic biochemical cage is arranged in the anaerobic zone for containing anaerobic granular sludge to avoid a large amount of sludge loss, the top of the anaerobic biochemical cage crosses the top of the inner zone, and the bottom of the anaerobic biochemical cage crosses the bottom of the inner zone, so that the granular sludge in the anaerobic biochemical cage can also circulate between the inner zone and the outer zone.

[0006] Optionally, the anaerobic zone, the anoxic zone and the aerobic zone are concentrically arranged, a first separation cylinder is arranged between the inner zone and the outer zone, a second separation cylinder is arranged between the outer zone and the anoxic zone, the top of the first separation cylinder is lower than the top of the second separation cylinder, the bottom of the first separation cylinder is higher than the bottom of the second separation cylinder, so as to facilitate the circulation of wastewater between the inner zone and the outer zone; the bottom of the second separation cylinder is connected to the bottom surface of the biochemical treatment zone, and there is a space between the top of the second separation cylinder and the top surface of the biochemical treatment zone, allowing wastewater to flow through; the bottom of the inner zone is provided with a water inlet pipe.

[0007] Optionally, the anaerobic biochemical cage comprises a circular hollow inner zone cage and an outer zone cage, the inner zone cage is located inside the inner zone, and the outer zone cage is located between the first separation cylinder and the second separation cylinder; the top of the inner zone cage and the top of the outer zone cage are connected to each other through an upper connecting ring cage, and the bottom of the inner zone cage and the bottom of the outer zone cage are connected to each other through a lower connecting ring cage, so that an inner-outer continuous cavity channel is formed inside the anaerobic biochemical cage, facilitating the circulation of granular sludge in the anaerobic zone along the cavity channel between the inner zone and the outer zone.

[0008] Further optionally, a plurality of vertical outer guide rails are arranged on the outer side wall of the outer zone cage, and the plurality of outer guide rails are uniformly distributed along the circumference of the outer side of the outer zone cage; a plurality of vertical inner guide rails are arranged on the inner side wall of the inner zone cage, and the plurality of inner guide rails are uniformly distributed along the circumference of the inner side of the inner zone cage; the outer guide rails and the inner guide rails correspond to each other one by one.

[0009] The top ends of the corresponding outer guide rails and inner guide rails are connected to each other through an upper guide rail, and the bottom ends of the corresponding outer guide rails and inner guide rails are connected to each other through a lower guide rail; the upper guide rail is arranged on the outer top surface of the upper connecting ring cage, and the lower guide rail is arranged on the outer bottom surface of the lower connecting ring cage.

[0010] Further optionally, the anaerobic biochemical cage further comprises a plurality of layers of trapping nets arranged one above another, the trapping net is circular when flattened, and the inner side of the trapping net is slidably connected to the outer guide rail, the upper guide rail, the inner guide rail and the lower guide rail; the water flow in the inner zone and the outer zone can push the trapping net to move continuously along the outer guide rail, the upper guide rail, the inner guide rail and the lower guide rail in the inner zone and the outer zone.

[0011] The outer side of the trapping net is provided with a plurality of magnets, the plurality of magnets are uniformly arranged along the circumference of the outer side of the trapping net, and the inner wall of the second separation cylinder is provided with a plurality of vertical metal strips at positions corresponding to the expanded magnets of the trapping net, the metal strips and the magnets correspond to each other one by one.

[0012] Optionally, the flow guide plate is circular, the flow guide plate closest to the second separation cylinder is a first flow guide plate, and then the flow guide plates are sequentially arranged in order from inside to outside.

[0013] The top of the odd-numbered guide vanes connects to the top surface of the biological treatment zone, and there is space between the bottom of the odd-numbered guide vanes and the bottom surface of the biological treatment zone, allowing wastewater to flow through; the bottom of the even-numbered guide vanes connects to the bottom surface of the biological treatment zone, and there is space between the top of the even-numbered guide vanes and the top surface of the biological treatment zone, allowing wastewater to flow through; the guide vanes closest to the aerobic zone in the anoxic zone are odd-numbered guide vanes.

[0014] Optionally, the sedimentation zone includes an effluent zone, a separation zone, and a settling zone from top to bottom. The effluent zone and the separation zone are cylindrical, and their diameters are the same as those of the biochemical treatment zone. The settling zone is conical, which is beneficial for the settling of sludge in the wastewater.

[0015] The overflow weir of the aerobic zone is connected to the top of the separation zone through the outlet pipe, which inputs the wastewater after aerobic treatment into the separation zone; the outlet of the return pipe passes through the aerobic zone and the anoxic zone and reaches between the second separator and the first guide plate; a filter media layer is provided in the separation zone, and the space above the filter media layer is the outlet zone, which is connected to the product water pipe for discharging the product water.

[0016] Optionally, the top of the settling zone is provided with a baffle plate. The baffle plate is circular and its surface is inclined downwards. That is, the outer side of the baffle plate is connected to the inner wall of the settling zone, and the inner side of the baffle plate is suspended and lower than its outer side. The inner side of the baffle plate is closer to the inner center of the settling zone. The baffle plate is used to block the sewage that just enters the settling zone from the outlet pipe, so that the sludge of this part of the sewage will settle and separate preferentially, avoiding clogging of the filter media layer. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of an integrated anaerobic-anoxic-aerobic reaction tank.

[0018] Fig. 2 This is a schematic diagram of the anaerobic biological cage in the anaerobic zone.

[0019] Fig. 3 A schematic diagram of connecting metal strips to a fishing net.

[0020] In the attached diagram, 1-Biological treatment zone, 2-Sedimentation zone, 3-Aerobic zone, 4-Anoxic zone, 5-Inner zone, 6-Outer zone, 7-Baffle plate, 8-Outlet pipe, 9-Return pipe, 10-First separator, 11-Second separator, 12-Inlet pipe, 13-Inner zone cage, 14-Outer zone cage, 15-Upper connecting ring cage, 16-Lower connecting ring cage, 17-Anaerobic zone, 18-Baffle plate, 19-Product water pipe, 20-Filter media layer, 21-Collection net, 22-Magnet, 23-Metal strip, 24-Outlet zone. Detailed Implementation

[0021] This embodiment provides an integrated anaerobic-anoxic-aerobic reaction tank, such as... Figs. 1-3As shown, including the upper biochemical treatment zone 1 and the lower sedimentation zone 2, the biochemical treatment zone 1 is cylindrical, from inside to outside including anaerobic zone 17, anoxic zone 4 and aerobic zone 3, anaerobic zone 17 is a sleeve structure and is divided into inner zone 5 and outer zone 6, wastewater is input into the bottom of the inner zone 5, and can flow between the inner zone 5 and the outer zone 6; the top of the outer zone is communicated with the anoxic zone 4, and the wastewater treated by the anaerobic zone 17 is overflowed to the anoxic zone 4;

[0022] The anoxic zone 4 is provided with a plurality of rows of guide plates 7, so that the wastewater can flow up and down in the anoxic zone 4 along the guide plates 7, the top of the anoxic zone 4 is communicated with the aerobic zone 3, and the wastewater treated by the anoxic zone 4 is overflowed to the aerobic zone 3; the outermost side of the aerobic zone 3 is provided with an overflow weir, the overflow weir is connected with the sedimentation zone 2 through a water outlet pipe 8; the bottom of the sedimentation zone 2 is connected with the anoxic zone 4 through a reflux pipe 9 for sludge reflux;

[0023] The anaerobic zone 17 is provided with an anaerobic biochemical cage for containing anaerobic activated sludge, so as to avoid a large amount of granular sludge loss, the top of the anaerobic biochemical cage crosses the top of the inner zone 5, and the bottom of the anaerobic biochemical cage crosses the bottom of the inner zone 5, so that the granular sludge in the anaerobic biochemical cage can also flow between the inner zone 5 and the outer zone 6.

[0024] Optionally, the anaerobic zone 17, the anoxic zone 4 and the aerobic zone 3 are concentrically arranged, a first separation cylinder 10 is arranged between the inner zone 5 and the outer zone 6, a second separation cylinder 11 is arranged between the outer zone 6 and the anoxic zone 4, the top of the first separation cylinder 10 is lower than the top of the second separation cylinder 11, and the bottom of the first separation cylinder 10 is higher than the bottom of the second separation cylinder 11, so as to facilitate the circulation of the wastewater between the inner zone 5 and the outer zone 6; the bottom of the second separation cylinder 11 is connected with the bottom surface of the biochemical treatment zone 1, and there is a space between the top of the second separation cylinder 11 and the top surface of the biochemical treatment zone 1, allowing the wastewater to flow through;

[0025] The bottom of the inner zone 5 is provided with a water inlet pipe 12, the water inlet pipe 12 penetrates out of the biochemical treatment zone and is connected with an external raw water pump.

[0026] Optionally, the anaerobic biochemical cage comprises a circular hollow inner zone cage 13 and an outer zone cage 14, the inner zone cage 13 is inside the inner zone 5, the outer zone cage 14 is between the first separation cylinder 10 and the second separation cylinder 11, the top of the inner zone cage 13 and the outer zone cage 14 are communicated with each other through an upper connecting ring cage 15, and the bottom of the inner zone cage 13 and the outer zone cage 14 are communicated with each other through a lower connecting ring cage 16, so that an inner-outer continuous cavity channel is formed in the anaerobic biochemical cage, facilitating the circulation of the granular sludge along the cavity channel between the inner zone 5 and the outer zone 6. The water inlet pipe 12 is outside the anaerobic biochemical cage.

[0027] Further, the outer side wall of the outer zone cage 14 is close to the inner wall of the second separation cylinder 11, and the inner side wall of the outer zone cage 14 is close to the outer wall of the first separation cylinder 10; the outer side wall of the inner zone cage 13 is close to the inner wall of the first separation cylinder 10, and the inner side wall of the inner zone cage 13 is close to the center of the inner zone 5.

[0028] Further, the outer side wall of the outer zone cage 14 is provided with a plurality of vertical outer rails, and the plurality of outer rails are uniformly distributed along the circumference of the outer side of the outer zone cage 14; the inner side wall of the inner zone cage 13 is provided with a plurality of vertical inner rails, and the plurality of inner rails are uniformly distributed along the circumference of the inner side of the inner zone cage 13; the outer rails and the inner rails correspond to each other in one-to-one correspondence.

[0029] The top ends of the corresponding outer rails and inner rails are connected by an upper rail, and the bottom ends of the corresponding outer rails and inner rails are connected by a lower rail; the upper rail is arranged on the outer side top surface of the upper connecting ring cage 15, and the lower rail is arranged on the outer side bottom surface of the lower connecting ring cage 16.

[0030] Further, the anaerobic biochemical cage further comprises a plurality of layers of trapping nets 21 arranged in a top-down manner, the trapping net 21 is a circular ring after being flattened, and the inner side edge of the trapping net 21 is slidably connected to the outer rail, the upper rail, the inner rail and the lower rail; the water flow in the inner zone 5 and the outer zone 6 can drive the trapping net 21 to move in the inner zone 5 and the outer zone 6 in sequence along the outer rail, the upper rail, the inner rail and the lower rail in continuous circulation;

[0031] The outer side edge of the trapping net 21 is provided with a plurality of magnets 22, and the plurality of magnets 22 are uniformly arranged along the circumference of the outer side edge of the trapping net 21; the inner wall of the second separation cylinder 11 is provided with a plurality of vertical metal strips 23 corresponding to the positions of the magnets 22 of the expanded trapping net 21, and the metal strips 23 correspond to the magnets 22 in one-to-one correspondence.

[0032] The anaerobic granular sludge is placed in the anaerobic biochemical cage, the outer zone cage 14 can cover most of the space of the outer zone 6, the inner zone cage 13 can cover most of the space of the inner zone 5, the anaerobic biochemical cage allows wastewater to enter and exit, and at the same time, the mesh of the net cage can limit most of the anaerobic granular sludge from leaking out of the anaerobic biochemical cage, thereby greatly reducing the loss of anaerobic granular sludge on the basis of not affecting the anaerobic biochemical treatment. Moreover, the wastewater flows in circulation between the inner zone 5 and the outer zone 6, and the outer zone cage 14 and the inner zone cage 13 are connected by the upper and lower connecting ring cages, so that the anaerobic granular sludge flows in circulation along the inside of the anaerobic biochemical cage under the driving action of the water flow, and the wastewater can fully contact with the sludge.

[0033] During the biochemical treatment process, granular sludge will collide with each other and partially break apart, causing some granular sludge particles to become smaller and able to escape from the anaerobic biological treatment cage. This invention designs a collection net 21 to handle these outflowing sludge particles, and the mesh diameter of the collection net 21 is smaller than the mesh diameter of the anaerobic biological treatment cage. The water flow in the anaerobic zone 17 can drive the trap net 21 to move along the guide rails on the outside of the anaerobic biological cage. Specifically, the rising water flow in the inner zone 5 pushes the trap net 21 upward along the inner guide rail, so that the trap net 21 covers the outer space of the inner side wall of the inner zone cage 13; after reaching the top of the inner zone cage 13, the water flow drives the trap net 21 to move outward along the upper guide rail, so that the trap net 21 extends to the space above the outer side of the upper connecting ring cage 15; when it reaches the top of the outer zone cage 14, the falling water flow pushes the trap net 21 downward along the outer guide rail, so that the trap net 21 covers the outer space of the outer side wall of the outer zone cage 14; when it reaches the bottom of the outer zone cage 14, the water flow drives the trap net 21 to move towards the inner zone 5 along the lower guide rail, so that the trap net 21 extends to the space below the outer side of the lower connecting ring cage 16.

[0034] Considering that the outer edge of the collection net 21 is easily washed away by water flow and spreads out and adheres to the side wall of the anaerobic biological treatment cage, this invention utilizes the design of magnets 22 and metal strips 23. The magnets 22 on the outer edge of the collection net 21 are attracted to the metal strips 23, causing the collection net 21 to unfold. At the same time, the water flow can also move the unfolded collection net 21, facilitating the collection of sludge from the outside of the anaerobic biological treatment cage. Inside the inner zone 5, the magnets 22 of the collection net 21 attract each other, allowing the collection net 21 to partially unfold. Sludge adheres to and accumulates on the collection net, and combined with wastewater, it is beneficial for the sludge to grow again on the collection net.

[0035] This invention also provides another form of the anaerobic biological cage, in which a motor is installed above the inner zone. The motor's shaft is evenly connected to the connecting ring cage via several connecting rods, enabling the anaerobic biological cage to rotate. The rotation of the anaerobic biological cage provides centrifugal force to each trapping net, allowing the trapping net to move along each guide rail while also unfolding under the action of centrifugal force. In this example, the aforementioned magnets and metal strips are not included.

[0036] Optionally, the guide plate 7 is circular, and the guide plate 7 closest to the second separator cylinder 11 is the first guide plate, and then the guide plates are arranged in sequence from the inside to the outside.

[0037] The top of the odd-numbered guide plates is connected to the top surface of biological treatment zone 1, and there is space between the bottom of the odd-numbered guide plates and the bottom surface of biological treatment zone 1 to allow wastewater to flow through; the bottom of the even-numbered guide plates is connected to the bottom surface of biological treatment zone 1, and there is space between the top of the even-numbered guide plates and the top surface of biological treatment zone 1 to allow wastewater to flow through; the guide plate closest to the aerobic zone in the anoxic zone 4 is the odd-numbered guide plate.

[0038] In the biochemical treatment zone 1, the wastewater is input into the bottom of the inner zone 5, and flows upward, penetrating the anaerobic biochemical cage, and contacts with the anaerobic granular sludge for biochemical treatment. Then, the wastewater overflows from the top of the first partitioning cylinder 10 into the inner part of the outer zone 6, and flows downward, penetrating the anaerobic biochemical cage, and contacts with the anaerobic granular sludge, and then returns from the bottom of the first partitioning cylinder 10 into the inner part of the inner zone 5, so that the circulation flow is carried out between the inner zone 5 and the outer zone 6, and the biochemical treatment is carried out in circulation. The treated wastewater at the top of the outer zone 6 overflows from the top of the second partitioning cylinder 11 into the anoxic zone 4, and contacts with the anoxic activated sludge for anoxic treatment. Between the second partitioning cylinder 11 and the first flow guide plate, the wastewater flows from top to bottom; between the first flow guide plate and the second flow guide plate, the wastewater flows from bottom to top; so that the wastewater flows up and down in the anoxic zone 4, the hydraulic retention time is prolonged, and the anoxic treatment effect is improved.

[0039] Optionally, the internal structure of the aerobic zone is the same as that of the anoxic zone, and a plurality of flow guide plates are also arranged, the positions of adjacent flow guide plates are staggered up and down, and the arrangement mode is the same as that of the flow guide plates of the anoxic zone. The aerobic zone is provided with aerobic activated sludge, and is provided with an aeration device at the bottom, for example, a spiral-shaped coiled aeration pipe is arranged, and the aeration pipe is uniformly arranged at the bottom of the aerobic zone.

[0040] Optionally, the sedimentation zone 2 comprises, from top to bottom, a water outlet zone 24, a separation zone and a sedimentation zone, the water outlet zone 24 and the separation zone are cylindrical and have the same diameter as that of the biochemical treatment zone 1; and the sedimentation zone is conical, which is beneficial to the sedimentation of sludge in the wastewater.

[0041] The overflow weir of the aerobic zone 3 is connected to the top of the separation zone through the water outlet pipe 8, and the wastewater after aerobic treatment is input into the separation zone; the outlet of the reflux pipe 9 penetrates the anoxic zone 4 and reaches between the second partitioning cylinder 11 and the first flow guide plate 7; the separation zone is provided with a filter material layer 20 for intercepting SS, suspended solids and the like in the wastewater after sedimentation, so as to reduce the turbidity of the outlet water; the space above the filter material layer 20 is the water outlet zone 24, and the water outlet zone 24 is connected to the water production pipe 19 for discharging the produced water.

[0042] Further optionally, the top of the sedimentation zone is provided with a ring-shaped baffle 18, the baffle 18 is annular, and the plate surface is inclined downward, that is, the outer side of the baffle 18 is connected to the inner wall of the sedimentation zone, the inner side of the baffle 18 is suspended and lower than the outer side of itself, and the inner side of the baffle 18 is closer to the inner center of the sedimentation zone, and the baffle 18 is used for blocking the wastewater just input into the sedimentation zone 2 by the water outlet pipe 8, so that the sludge of this part of wastewater is preferentially settled and separated, and the filter material layer 20 is prevented from being blocked. Preferably, the inclination angle of the baffle 18 is 40-60°.

[0043] The filter layer 20 uses the conventional filter in the art. The inclined side wall of the sedimentation zone is conducive to the sedimentation of sludge in the sewage. The bottom of the sedimentation zone is provided with a discharge outlet for discharging sludge. The discharge outlet is connected with the reflux pipe 9 and the discharge pipe. After part of the sludge is discharged by the discharge pipe, professional solid waste treatment is performed.

Claims

1. An integrated anaerobic-anoxic-aerobic tank, characterized by, The biochemical treatment zone comprises an upper biochemical treatment zone and a lower sedimentation zone, the biochemical treatment zone is cylindrical, and comprises, from inside to outside, an anaerobic zone, an anoxic zone and an aerobic zone, the anaerobic zone is a sleeve structure and is divided into an inner zone and an outer zone, wastewater is input into the bottom of the inner zone and can flow between the inner zone and the outer zone, and the top of the outer zone is connected to the anoxic zone; A plurality of flow guide plates are arranged in the anoxic zone, so that the wastewater can flow up and down in the anoxic zone along the flow guide plates, and the top of the anoxic zone is connected to the aerobic zone; the outermost side of the aerobic zone is provided with an overflow weir, the overflow weir is connected to the sedimentation zone through a water outlet pipe, and the bottom of the sedimentation zone is connected to the anoxic zone through a reflux pipe for sludge reflux; The anaerobic zone is provided with an anaerobic biochemical cage for containing anaerobic granular sludge, the top of the anaerobic biochemical cage is above the top of the inner zone, and the bottom of the anaerobic biochemical cage is below the bottom of the inner zone, so that the granular sludge in the anaerobic biochemical cage can also flow between the inner zone and the outer zone.

2. The integrated anaerobic-anoxic-aerobic tank according to claim 1, characterized in that, The anaerobic zone, the anoxic zone and the aerobic zone are concentrically arranged, a first separation cylinder is arranged between the inner zone and the outer zone, a second separation cylinder is arranged between the outer zone and the anoxic zone, the top of the first separation cylinder is lower than the top of the second separation cylinder, and the bottom of the first separation cylinder is higher than the bottom of the second separation cylinder, so as to facilitate the circulation of wastewater between the inner zone and the outer zone; the bottom of the second separation cylinder is connected to the bottom surface of the biochemical treatment zone, and there is a space between the top of the second separation cylinder and the top surface of the biochemical treatment zone, allowing the wastewater to flow through; the bottom of the inner zone is provided with a water inlet pipe.

3. The integrated anaerobic-anoxic-aerobic tank according to claim 2, characterized in that, The anaerobic biochemical cage comprises a hollow inner zone cage and an outer zone cage in the form of a circular ring, the inner zone cage is arranged inside the inner zone, and the outer zone cage is arranged between the first separation cylinder and the second separation cylinder; The top of the inner zone cage and the top of the outer zone cage are connected to each other through an upper connecting ring cage, and the bottom of the inner zone cage and the bottom of the outer zone cage are connected to each other through a lower connecting ring cage, so that an inner-outer continuous cavity channel is formed in the anaerobic biochemical cage, and the granular sludge in the anaerobic zone can flow between the inner zone and the outer zone along the cavity channel.

4. The integrated anaerobic-anoxic-aerobic tank according to claim 3, characterized in that, A plurality of vertical outer rails are arranged on the outer side wall of the outer zone cage, and the plurality of outer rails are uniformly distributed along the circumference of the outer side of the outer zone cage; a plurality of vertical inner rails are arranged on the inner side wall of the inner zone cage, and the plurality of inner rails are uniformly distributed along the circumference of the inner side of the inner zone cage; the outer rails and the inner rails correspond to each other in one-to-one correspondence; The top ends of the corresponding outer rails and inner rails are connected to each other through upper rails, and the bottom ends of the corresponding outer rails and inner rails are connected to each other through lower rails; the upper rails are arranged on the outer top surface of the upper connecting ring cage, and the lower rails are arranged on the outer bottom surface of the lower connecting ring cage.

5. The integrated anaerobic-anoxic-aerobic tank according to claim 4, characterized in that, The anaerobic biochemical cage further comprises a plurality of layers of trapping nets arranged one above another, the trapping nets are in the form of a circular ring when flattened, and the inner side edges of the trapping nets are slidably connected to the outer rails, the upper rails, the inner rails and the lower rails; the water flow in the inner zone and the outer zone can push the trapping nets to move continuously in the inner zone and the outer zone along the outer rails, the upper rails, the inner rails and the lower rails in sequence.

6. The integrated anaerobic-anoxic-aerobic tank according to claim 5, characterized in that, A plurality of magnets are arranged on the outer side edges of the trapping nets, and the plurality of magnets are uniformly arranged along the circumference of the outer side edges of the trapping nets; a plurality of vertical metal strips are arranged on the inner wall of the second separation cylinder at positions corresponding to the expanded trapping nets, and the metal strips correspond to the magnets in one-to-one correspondence.

7. The integrated anaerobic-anoxic-aerobic tank according to claim 1, characterized in that, The guide plates are circular, the guide plate closest to the second partition cylinder is the first guide plate, and then the guide plates are sequentially arranged in order from inside to outside; The top of the odd-numbered guide plate is connected to the top surface of the biochemical treatment zone, and there is a space between the bottom of the odd-numbered guide plate and the bottom surface of the biochemical treatment zone, allowing the wastewater to flow through; the bottom of the even-numbered guide plate is connected to the bottom surface of the biochemical treatment zone, and there is a space between the top of the even-numbered guide plate and the top surface of the biochemical treatment zone, allowing the wastewater to flow through; the guide plate closest to the aerobic zone in the anoxic zone is the odd-numbered guide plate.

8. The integrated anaerobic-anoxic-aerobic tank according to claim 1, characterized in that, The sedimentation zone includes, from top to bottom, a water outlet zone, a separation zone and a sedimentation zone, the water outlet zone and the separation zone are cylindrical and have the same diameter as the biochemical treatment zone; the sedimentation zone is conical, which is conducive to the sedimentation of sludge in the wastewater; The overflow weir of the aerobic zone is connected to the top of the separation zone through a water outlet pipe to input the wastewater treated by the aerobic treatment into the separation zone; the outlet of the reflux pipe passes through the aerobic zone and the anoxic zone to reach between the second partition cylinder and the first guide plate; a filter material layer is arranged in the separation zone, and the space above the filter material layer is the water outlet zone, which is connected to a water production pipe for discharging the produced water.

9. The integrated anaerobic-anoxic-aerobic tank according to claim 8, characterized in that, The top of the sedimentation zone is provided with a ring of baffles, the baffles are circular and the plate surface is inclined downward, the outer side of the baffles is connected to the inner wall of the sedimentation zone, the inner side of the baffles is suspended and lower than the outer side, the inner side of the baffles is closer to the inner center of the sedimentation zone, and the baffles are used to block the wastewater input into the sedimentation zone by the water outlet pipe, so that the sludge of this part of the wastewater is preferentially settled and separated, avoiding the blockage of the filter material layer.

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