An integrated biological water treatment equipment

Abstract

This invention relates to the field of wastewater treatment technology and discloses an integrated biological water treatment device. This integrated biological water treatment device includes a tank, an inlet pipe, an outlet pipe, an anoxic zone, an aerobic zone, a sedimentation zone, and a graded treatment unit. By setting vertical baffles and horizontal deflectors alternately, this integrated biological water treatment device forces wastewater to make multiple turns in both the horizontal and vertical directions, extending the actual flow path of the wastewater within the limited volume of the tank and increasing the hydraulic retention time. Simultaneously, guide cones are arranged at the bottom of the tank between adjacent vertical baffles. When water flows through the gaps at the bottom of the vertical baffles, it impacts the inclined surface of the guide cones, generating upward and lateral water flow components. This carries the sludge deposited at the bottom of the tank upwards and laterally, eliminating the dead flow zone at the bottom and extending the contact time between the wastewater and microorganisms, thus reducing sludge accumulation at the bottom of the tank.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an integrated biological water treatment device. Background Technology

[0002] Integrated biological water treatment equipment is widely used in decentralized wastewater treatment scenarios due to its advantages such as compact structure, small footprint, and convenient installation.

[0003] However, due to the small volume and short hydraulic retention time of the equipment, wastewater is prone to "hydraulic short-circuiting" after entering the equipment. This means that the influent flows directly from the inlet to the outlet along the shortest path, and some water stays in the equipment for a much shorter time than the designed hydraulic retention time. The direct consequence of hydraulic short-circuiting is insufficient contact time between wastewater and microorganisms. Microorganisms fail to fully decompose organic matter and are discharged with the water flow, resulting in decreased treatment efficiency and unstable effluent quality. In addition, hydraulic short-circuiting also causes uneven flow field distribution inside the equipment, with some areas (such as the bottom corners) forming flow dead zones where sludge accumulates and cannot participate in biological reactions, further reducing the effective biomass. To address this, we propose an integrated biological water treatment equipment.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated biological water treatment device to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: An integrated biological water treatment device, comprising a tank, and further comprising: The inlet pipe runs through and is fixedly installed on the inner wall of one end of the pool body, and is used to connect to the external wastewater input pipeline. The outlet pipe runs through and is fixedly installed on the inner wall of the other end of the tank, and is used to connect to external pipelines and output the treated water. The anoxic zone is located inside the pool near the inlet pipe and is used to provide a living environment for anaerobic bacteria. The aerobic zone, located in the middle of the pool, is used to provide a living environment for aerobic bacteria; The sedimentation zone is located inside the tank near the outlet pipe and is used to allow the treated water to settle and impurities to settle. A graded treatment unit is installed inside the tank to treat impurities in the wastewater in separate zones. The hierarchical processing unit includes: The flow guiding module, located in the anoxic zone, is used to extend the hydraulic residence time and eliminate hydraulic short circuits; The aeration module, located in the aerobic zone, is used for the uniform release and dispersion of aeration bubbles; The sludge return module, located in the sedimentation zone, is used for sludge reuse and to maintain the biomass in the equipment.

[0006] Preferably, a first baffle is provided between the aerobic zone and the anoxic zone, and a second baffle is provided between the aerobic zone and the sedimentation zone. Both the first baffle and the second baffle are fixedly connected to the inner wall of the pool.

[0007] Preferably, the flow guiding module includes: Multiple sets of vertical baffles are fixedly installed in a linear array on the inner walls of both sides of the anoxic zone to force the wastewater in the pool to flow around the bottom of the pool. Multiple sets of horizontal baffles are placed between two adjacent sets of vertical baffles to force the water flow to turn horizontally. Several through holes are evenly distributed on the inner wall of the horizontal baffle plate to allow part of the flowing water to pass through the through holes to form a jet; Multiple sets of guide cones are evenly distributed between two adjacent sets of vertical baffles to guide the water flow upward and to both sides, forming a vortex ring and suspending the sludge deposited at the bottom of the pool.

[0008] Preferably, a gap is provided between the bottom plane of the vertical baffle and the bottom inner wall of the pool, and the top of the vertical baffle is flush with the top surface of the pool. The bottom gap of the vertical baffle is lower than that of the horizontal baffle. The vertical baffle is perpendicular to the water inlet direction, and the horizontal baffle is parallel to the water inlet direction.

[0009] Preferably, the aeration module includes: A flow guide hood is fixedly installed on the inner wall of the first baffle and is used to connect the hypoxic zone and the aerobic zone. The frame is fixedly installed on the top of the aerobic zone to provide an anchor point for the aeration module in the aerobic zone; An aeration main shaft is rotatably mounted on the bottom of the frame. An aeration sub-shaft is fixedly mounted on the side wall of the aeration main shaft. A central cavity is opened inside the aeration main shaft. Several aeration holes are distributed on the outer arc surfaces of the aeration main shaft and the aeration sub-shaft for continuously spraying bubbles into the wastewater in the aerobic zone. The connector is fixedly connected to the top of the frame and is used to connect the external air supply equipment and the central cavity opened inside the aeration main shaft; A nozzle ring is coaxially fixedly installed on the bottom outer wall of the aeration main shaft. The inner wall of the nozzle ring is provided with an air jet nozzle that is connected to the central cavity. An impeller is fixedly installed on the outer wall of the aeration main shaft to drive the aeration main shaft to rotate continuously at the bottom of the frame.

[0010] Preferably, the flow deflector is configured as a horn shape including a wide end and a narrow end, and the narrow end of the flow deflector is positioned closer to the hypoxic zone.

[0011] Preferably, the blades of the impeller are arranged in a downward inclined position, and the top axis of the jet nozzle faces the lower surface of the blades of the impeller.

[0012] Preferably, the sludge return module includes: A baffle plate is fixedly installed on the top of the second baffle plate near the aerobic zone side, and is used to guide the air bubbles back to the aerobic zone side; Inclined pipes are fixedly installed at an angle on the inner wall of the sedimentation zone to dissipate energy, slow down the flow of mixed liquor into the sedimentation zone, and guide the sludge to slide down for collection. A V-shaped sludge hopper is fixedly installed on the bottom inner wall of the sedimentation zone. A sludge collection trough is provided at the lowest point of the V-shaped sludge hopper to collect and gather the sludge that has settled in the sedimentation zone. A return pump is installed on one side of the tank, and the input end of the return pump is installed in the sludge collection tank through the side wall of the tank, for pumping out the sludge deposited in the sludge collection tank. A three-way pipe is fixedly installed at the output end of the return pump, and a sludge return pipe is fixedly connected to one of the output ports of the three-way pipe. The end of the sludge return pipe away from the three-way pipe penetrates the inner wall of the tank on the side of the anoxic zone, and is used to re-input some sludge into the anoxic zone. A dispersing ring is rotatably installed on the inner wall of the end of the sludge return pipe. The inner arc surface of the dispersing ring has multiple sets of rotating blades arranged in a circumferential array to disperse sludge at the tail end of the sludge return pipe.

[0013] Preferably, the bottom surface of the second baffle is in contact with the bottom inner wall of the pool, and the top surface of the second baffle is lower than the top surface of the pool. The side of the inclined pipe near the water inlet faces the top of the second baffle, and the mud collection tank is located below the side of the inclined pipe near the water inlet.

[0014] Preferably, the end of the mud return pipe furthest from the tee pipe is located at the center of the oxygen-deficient zone, and the end of the mud return pipe is arranged vertically.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting up vertical baffles and horizontal deflectors alternately, forces wastewater to make multiple turns in both the horizontal and vertical directions, extending the actual flow path of wastewater within a limited volume tank and increasing the hydraulic residence time. Simultaneously, guide cones are arranged at the bottom of the tank between adjacent vertical baffles. When water flows through the gaps at the bottom of the vertical baffles, it impacts the inclined surface of the guide cones, generating upward and lateral water flow components. This causes the sludge deposited at the bottom of the tank to be suspended upwards and pushed laterally, eliminating dead zones at the bottom. This extends the contact time between wastewater and microorganisms, reduces sludge accumulation at the bottom of the tank, and solves the problems of hydraulic short-circuiting and limited organic matter decomposition effects caused by small equipment volume.

[0016] This invention also incorporates an aeration main shaft and an aeration sub-shaft driven by an impeller. High-pressure gas ejected from the nozzle directly impacts the impeller blades, causing the aeration main shaft and sub-shaft to rotate continuously. During rotation, the aeration sub-shaft mechanically cuts the bubbles released from the aeration holes, resulting in a more uniform distribution of bubbles in the wastewater. Simultaneously, a funnel-shaped flow guide ensures that the water flow first accelerates and then decelerates, smoothly entering the aerobic zone. This avoids excessive scouring of the bottom sludge by the high-speed water flow, improves the uniformity of bubble dispersion and oxygen transfer efficiency, and solves the problems of uneven aeration and dissolved oxygen fluctuations leading to unstable microbial activity in the aerobic zone.

[0017] This invention also improves sludge collection efficiency by setting up a V-shaped sludge hopper and a sludge collection trough, allowing the settled sludge to automatically slide down the slope and collect at the bottom of the trough. An inclined pipe decelerates the mixed liquid flowing into the sedimentation zone, causing sludge particles to collide and slide off the inner wall of the pipe, completing preliminary sludge-water separation. A return pump extracts the collected sludge and diverts it through a three-way pipe. Part of the sludge is sent back to the center of the anoxic zone through a return pipe. The dispersion ring and rotating blades at the end of the return pipe rotate under the drive of the sludge flow, cutting and dispersing the returned sludge into the water. This achieves directional return and uniform dispersion of sludge, maintaining stable biomass in the anoxic zone and solving the problem of reduced effective biomass caused by sludge deposition preventing participation in biological reactions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the pool body of the present invention; Figure 3 This is a schematic diagram of the flow guiding module structure of the present invention; Figure 4 This is a schematic diagram of the aeration module and sludge return module of the present invention; Figure 5 This is a schematic cross-sectional view of the aeration main shaft and aeration secondary shaft of the present invention; Figure 6 This is a cross-sectional view of the end of the mud return pipe of the present invention; Figure 7 This is a schematic diagram of the dispersion ring structure of the present invention.

[0019] Attached diagram descriptions: 1. Tank body; 2. Inlet pipe; 3. Outlet pipe; 11. Anoxic zone; 12. Aerobic zone; 13. Sedimentation zone; 14. First baffle; 15. Second baffle; 4. Staged treatment unit; 41. Flow guiding module; 411. Vertical baffle; 412. Horizontal baffle; 413. Through hole; 414. Flow guiding cone; 42. Aeration module; 421. Flow guiding hood; 422. Frame; 423. Connection 424. Aeration main shaft; 425. Central cavity; 426. Aeration hole; 427. Nozzle ring; 428. Air jet nozzle; 429. Impeller; 4210. Aeration secondary shaft; 43. Sludge return module; 431. Air baffle; 432. Inclined pipe; 433. V-shaped sludge hopper; 434. Sludge collection trough; 435. Return pump; 436. T-connector; 437. Sludge return pipe; 438. Dispersion ring; 439. Rotating blade. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-7 The present invention provides a technical solution: an integrated biological water treatment device, including a tank 1, and further comprising: The inlet pipe 2 is installed through and fixedly on the inner wall of one end of the pool body 1, and is used to connect to the external wastewater input pipeline; The outlet pipe 3 is installed through and fixedly on the inner wall of the other end of the tank body 1, and is used to connect to the external pipeline and output the treated water to the outside. Anoxic zone 11 is located inside pool 1 on the side near the inlet pipe 2, and is used to provide a living environment for anaerobic bacteria. Aerobic zone 12 is located in the middle of pool 1 and is used to provide a living environment for aerobic bacteria. Sedimentation zone 13 is located inside pool 1 on the side near the outlet pipe 3, and is used to settle the treated water and settle the impurities in it. The graded treatment unit 4 is located inside the tank 1 and is used to treat impurities in the wastewater in separate zones. The hierarchical processing unit 4 includes: The flow guiding module 41 is located in the anoxic zone 11 and is used to extend the hydraulic residence time and eliminate hydraulic short circuits. Aeration module 42 is set in the aerobic zone 12 and is used for the uniform release and dispersion of aeration bubbles; The sludge return module 43 is located in the sedimentation zone 13 and is used for sludge reuse and to maintain the biomass in the equipment.

[0022] The interior of tank 1 is divided into an anoxic zone 11, an aerobic zone 12, and a sedimentation zone 13 from the inlet side to the outlet side, forming a graded treatment space. The inlet pipe 2 is used to introduce external wastewater, and the outlet pipe 3 is used to discharge the treated clean water. The anoxic zone 11 provides an anaerobic environment for anaerobic bacteria, enabling microorganisms to carry out denitrification and organic matter hydrolysis and acidification reactions. The aerobic zone 12 provides an aerobic environment for aerobic bacteria, enabling microorganisms to carry out organic matter degradation and nitrification reactions. The sedimentation zone 13 provides a static space, allowing suspended sludge to settle under gravity, achieving sludge-water separation. The flow guiding module 41 is installed in the anoxic zone 11 to force wastewater to flow along a zigzag path, eliminating hydraulic short circuits and extending hydraulic residence time. The aeration module 42 is installed in the aerobic zone 12 to uniformly release air bubbles into the wastewater and cut and disperse them, improving oxygen mass transfer efficiency. The sludge return module 43 is installed in the sedimentation zone 13 to collect settled sludge and return part of it to the anoxic zone 11 to maintain stable biomass within the equipment.

[0023] A first baffle 14 is provided between the aerobic zone 12 and the anoxic zone 11, and a second baffle 15 is provided between the aerobic zone 12 and the sedimentation zone 13. Both the first baffle 14 and the second baffle 15 are fixedly connected to the inner wall of the tank body 1.

[0024] The first baffle 14 is vertically fixed to the inner wall of the pool body 1 and located between the anoxic zone 11 and the aerobic zone 12. It is used to separate the two areas with different oxygen environments and prevent the water in the anoxic zone 11 and the aerobic zone 12 from flowing directly laterally. The second baffle 15 is vertically fixed to the inner wall of the pool body 1 and located between the aerobic zone 12 and the sedimentation zone 13. It is used to separate the aerobic zone 12 and the sedimentation zone 13 and at the same time prevent the air bubbles generated in the aerobic zone 12 from entering the sedimentation zone 13. Both the first baffle 14 and the second baffle 15 form a sealed connection with the inner wall of the pool body 1 to ensure that the water flow between each area can only flow through the preset flow channel and will not generate untreated short flow paths.

[0025] Please see Figure 3 The flow guiding module 41 includes: Multiple sets of vertical baffles 411 are fixedly installed in a linear array on the inner walls of both sides of the anoxic zone 11 to force the wastewater in the pool 1 to flow around to the bottom of the pool 1. Multiple sets of horizontal baffles 412 are arranged between two adjacent sets of vertical baffles 411 to force the water flow to turn horizontally. Several through holes 413 are evenly distributed on the inner wall of the horizontal baffle 412 to allow part of the flowing water to pass through the through holes 413 to form a jet. Multiple sets of guide cones 414 are evenly distributed between two adjacent sets of vertical baffles 411 to guide the water flow upward and to both sides, forming a vortex ring and causing the sludge deposited at the bottom of the pool to suspend.

[0026] Multiple sets of horizontal baffles 412 are arranged between two adjacent sets of vertical baffles 411. The horizontal baffles 412 are arranged parallel to the water inlet direction and their surfaces are perpendicular to the surfaces of the vertical baffles 411. They are used to force the water flow after passing through the bottom gap to turn again in the horizontal direction, forming a zigzag flow path that alternates between vertical and horizontal. Several through holes 413 allow some water flow to pass through the through holes 413 at high speed when the water flow is blocked by the horizontal baffles 412, forming a jet. After the jet enters the downstream area, it generates local turbulence, which enhances the mixing and contact effect between wastewater and microorganisms. Multiple sets of guide cones 414 are evenly distributed on the bottom inner wall of the pool body 1 between two adjacent sets of vertical baffles 411, with the cone tips facing upward. When the water flow passes through the bottom gap of the vertical baffles 411 at high speed, the water flow hits the inclined surface of the guide cones 414 and is decomposed into an upward component and a horizontal component to both sides. The upward component carries the bottom sediment sludge upward to be suspended, and the horizontal component pushes the sludge laterally along the bottom of the pool, thereby eliminating the dead zone of bottom sludge accumulation.

[0027] A gap is provided between the bottom plane of the vertical baffle 411 and the bottom inner wall of the pool body 1, and the top of the vertical baffle 411 is flush with the top surface of the pool body 1. The bottom gap of the vertical baffle 411 is lower than that of the horizontal baffle 412. The vertical baffle 411 is perpendicular to the water inlet direction, and the horizontal baffle 412 is parallel to the water inlet direction.

[0028] The gap between the vertical baffle 411 and the bottom of the pool 1 serves as a forced flow channel, forcing wastewater to be blocked above the vertical baffle 411 and forced to flow downwards through the gap, thus achieving a forced deflection of the water flow in the vertical direction. The top of the vertical baffle 411 is flush with the top surface of the pool 1, ensuring that wastewater cannot pass above the vertical baffle 411 and eliminating short flow paths near the water surface. The bottom gap of the vertical baffle 411 is lower than the horizontal baffle 412 in the vertical direction, so that the wastewater must first pass through the bottom gap to complete the downward deflection and then enter the flow area of ​​the horizontal baffle 412 upwards, forming a deflection flow line from bottom to top. The vertical baffle 411 is arranged perpendicular to the water inlet direction, so that its plate surface faces the incoming flow direction, producing the maximum blocking effect. The horizontal baffle 412 is arranged parallel to the water inlet direction, so that its plate surface is parallel to the water flow direction, achieving horizontal deflection and guidance without significantly increasing head loss.

[0029] Please see Figures 4-5 The aeration module 42 includes: The flow guide 421 is fixedly installed on the inner wall of the first baffle 14 and is used to connect the hypoxic zone 11 and the aerobic zone 12. The frame 422 is fixedly installed on the top of the aerobic zone 12 and is used to provide the installation anchor point for the aeration module 42 in the aerobic zone 12; An aeration main shaft 424 is rotatably mounted on the bottom of the frame 422. An aeration sub-shaft 4210 is fixedly mounted on the side wall of the aeration main shaft 424. A central cavity 425 is opened inside the aeration main shaft 424. Several aeration holes 426 are distributed on the outer arc surfaces of the aeration main shaft 424 and the aeration sub-shaft 4210 for continuously spraying bubbles into the wastewater in the aerobic zone 12. The connector 423 is fixedly connected to the top of the frame 422 and is used to connect the external air supply equipment and the central cavity 425 opened inside the aeration main shaft 424; The nozzle ring 427 is coaxially fixedly installed on the bottom outer wall of the aeration main shaft 424. The inner wall of the nozzle ring 427 is provided with a jet nozzle 428 that is connected to the central cavity 425. An impeller 429 is fixedly installed on the outer wall of the aeration main shaft 424 to drive the aeration main shaft 424 to rotate continuously at the bottom of the frame 422.

[0030] The guide hood 421 decelerates the mixed liquid flowing out of the anoxic zone 11 and guides it into the aerobic zone 12. The frame 422 is fixedly installed on the top wall of the aerobic zone 12, serving as the installation anchor point for the aeration module 42 and providing rotational support for the aeration main shaft 424. The aeration main shaft 424 is rotatably installed at the bottom of the frame 422 and can rotate freely within the frame 422. An aeration sub-shaft 4210 is fixedly installed on the side wall of the aeration main shaft 424, forming a cross-shaped or radial air distribution structure. A central cavity 425 is opened inside the aeration main shaft 424 as an airflow channel. Several aeration holes 426 are distributed on the outer arc surfaces of the aeration main shaft 424 and the aeration sub-shaft 4210, used to release the gas in the central cavity 425 into the wastewater of the aerobic zone 12 in the form of microbubbles. Connector 423 is fixed to the top of the frame 422. One end of it is connected to an external air supply device, and the other end is connected to the central cavity 425 of the aeration main shaft 424 to achieve airtight gas delivery from the static pipeline to the rotating main shaft. The nozzle ring 427 is coaxially fixed on the bottom outer wall of the aeration main shaft 424. The inner wall of the nozzle ring 427 is provided with a jet nozzle 428 that is connected to the central cavity 425. An impeller 429 is fixedly installed on the outer wall of the aeration main shaft 424. The outlet direction of the jet nozzle 428 is facing the blade surface of the impeller 429. When high-pressure gas is ejected from the jet nozzle 428, the airflow impacts the blades of the impeller 429, driving the impeller 429 to drive the aeration main shaft 424 and the aeration sub-shaft 4210 to rotate continuously at the bottom of the frame 422 to achieve rotational aeration.

[0031] The flow deflector 421 is configured as a horn shape including a wide end and a narrow end, and the narrow end of the flow deflector 421 is positioned closer to the hypoxia zone 11.

[0032] When the water flows from the anoxic zone 11 into the guide shroud 421 through the narrow end, the flow velocity increases and then decreases after entering the wide end, forming a flow characteristic of first accelerating and then decelerating. This not only improves the penetration of the water into the aerobic zone 12, but also avoids excessive scouring of the sludge at the bottom of the aerobic zone 12 by the high-speed water flow. At the same time, the funnel-shaped structure utilizes the pressure difference generated by the change in flow velocity to prevent air bubbles in the aerobic zone 12 from entering the anoxic zone 11 in reverse through the guide shroud 421, ensuring that the dissolved oxygen environment in the anoxic zone 11 is not disturbed.

[0033] The blades of the impeller 429 are arranged at a downward angle, and the top axis of the nozzle 428 faces the lower surface of the blades of the impeller 429.

[0034] The top axis of the nozzle 428 is arranged towards the lower surface of the blades of the impeller 429, ensuring that the high-pressure airflow ejected from the nozzle 428 directly impacts the lower surface of the blades vertically or obliquely, maximizing the conversion of the kinetic energy of the airflow into the rotational torque of the impeller 429. The downward tilt angle of the impeller 429 blades matches the injection direction of the nozzle 428, so that the gas is discharged downward or to the side along the blade surface after impacting the blades, avoiding backflow that interferes with rotational stability, thereby achieving pneumatic drive.

[0035] Please see Figure 4 and Figures 6-7 The sludge return module 43 includes: The air baffle 431 is fixedly installed on the top of the second baffle 15 near the aerobic zone 12 and is used to guide the air bubbles back to the aerobic zone 12. Inclined pipe 432 is fixedly installed on the inner wall of sedimentation zone 13 in an inclined manner to dissipate energy, slow down the flow of mixed liquor into sedimentation zone 13 and guide sludge to slide down for collection. V-shaped sludge hopper 433 is fixedly installed on the bottom inner wall of sedimentation zone 13. A sludge collection trough 434 is provided at the lowest point of V-shaped sludge hopper 433 for collecting and collecting the sludge that settles in sedimentation zone 13. A return pump 435 is installed on one side of the tank body 1, and the input end of the return pump 435 passes through the side wall of the tank body 1 and is installed in the sludge collection tank 434 for pumping out the sludge deposited in the sludge collection tank 434. The three-way pipe 436 is fixedly installed at the output end of the return pump 435, and one output port of the three-way pipe 436 is fixedly connected to the sludge return pipe 437. The end of the sludge return pipe 437 away from the three-way pipe 436 penetrates the inner wall of the pool body 1 on one side of the anoxic zone 11, and is used to re-input some sludge into the anoxic zone 11. A dispersing ring 438 is rotatably mounted on the inner wall of the end of the sludge return pipe 437. The inner arc surface of the dispersing ring 438 has multiple sets of rotating blades 439 arranged in a circumferential array to disperse sludge at the tail end of the sludge return pipe 437.

[0036] The baffle plate 431 is slightly tilted downwards towards the aerobic zone 12 to intercept rising air bubbles in the aerobic zone 12, allowing the bubbles to slide along the lower surface of the baffle plate 431 towards the water surface of the aerobic zone 12 and be released, preventing the bubbles from passing over the second baffle plate 15 and entering the sedimentation zone 13. The inclined pipe 432 is fixedly installed at an incline on the inner wall of the sedimentation zone 13, with its inlet end higher than its outlet end and facing the second baffle plate 15. It is used to receive the mixed liquid flowing from the aerobic zone 12 through the top of the second baffle plate 15 into the sedimentation zone 13, and to mix the liquid. As the liquid flows from high to low within the inclined tube 432, its velocity gradually decreases, achieving energy dissipation and deceleration. Simultaneously, sludge particles in the mixed liquid collide with the inner wall of the inclined tube 432 and slide down the tube wall towards the lower end, completing preliminary sludge-water separation. A V-shaped sludge hopper 433 is fixedly installed on the bottom inner wall of the sedimentation zone 13, with its two inner walls converging in a V-shape. A sludge collection trough 434 is located at the lowest point. Sludge settling in the sedimentation zone 13 slides down the inclined surface of the V-shaped sludge hopper 433 into the sludge collection trough 434, accumulating and collecting the sludge. A flow pump 435 is installed outside the tank body 1, with its input end penetrating through the side wall of the tank body 1 and extending into the sludge collection tank 434. It is used to extract the concentrated sludge accumulated in the sludge collection tank 434. A three-way pipe 436 is fixedly installed at the output end of the return pump 435 to divert the sludge extracted by the return pump 435 into two output ports. One output port is connected to the external sludge discharge pipe, and the other output port is connected to the return sludge pipe 437. The end of the return sludge pipe 437 away from the three-way pipe 436 penetrates through the inner wall of the tank body 1 on the side of the anoxic zone 11. The system is used to reintroduce some sludge into the anoxic zone 11 to maintain the total number of microorganisms in the system. The dispersion ring 438 is rotatably installed on the inner wall of the end of the sludge return pipe 437. The inner arc surface of the dispersion ring 438 has multiple sets of rotating blades 439 arranged in a circumferential array. When the sludge is discharged from the end of the sludge return pipe 437, the sludge flow drives the rotating blades 439 to rotate the dispersion ring 438. The rotating blades 439 cut and disperse the discharged sludge into the water body of the anoxic zone 11, so as to achieve rapid and uniform dispersion of the returned sludge.

[0037] The bottom surface of the second baffle 15 is in contact with the bottom inner wall of the pool body 1, and the top surface of the second baffle 15 is lower than the top surface of the pool body 1. The side of the inclined pipe 432 near the water inlet faces the top of the second baffle 15, while the mud collection tank 434 is located below the side of the inclined pipe 432 near the water inlet.

[0038] The bottom surface of the second baffle 15 is in contact with the bottom inner wall of the pool body 1, ensuring that the water containing air bubbles at the bottom of the aerobic zone 12 cannot enter the sedimentation zone 13 through the bottom of the second baffle 15. Only a flow channel is formed at the top of the second baffle 15. The top surface of the second baffle 15 is lower than the top surface of the pool body 1, so that the relatively clear top layer water with low air bubble content in the upper part of the aerobic zone 12 can overflow through the second baffle 15 and enter the sedimentation zone 13. The inlet end of the inclined pipe 432 is set facing the top of the second baffle 15, so that the water overflowing from the top of the second baffle 15 can be directly received by the inlet end of the inclined pipe 432, avoiding the water from falling directly into the sedimentation zone 13 and causing disturbance to the bottom sludge. The sludge collection tank 434 is set below the side of the inclined pipe 432 near the inlet end, so that the sludge sliding down the bottom of the inclined pipe 432 can fall directly into the sludge collection tank 434, shortening the horizontal migration distance of the sludge at the bottom of the sedimentation zone 13 and improving the sludge collection efficiency.

[0039] The end of the return mud pipe 437 away from the tee pipe 436 is located at the center of the oxygen-deficient zone 11, and the end of the return mud pipe 437 is set vertically.

[0040] The end of the sludge return pipe 437 away from the tee pipe 436 is located in the central area of ​​the anoxic zone 11, allowing the returned sludge to be released at the geometric center of the anoxic zone 11. The sludge is evenly distributed throughout the anoxic zone 11 space by utilizing the natural diffusion effect of the water flow inside the anoxic zone 11. The end of the sludge return pipe 437 is set vertically, allowing the returned sludge to be discharged upward or horizontally from the pipe opening, avoiding the sludge directly impacting the bottom of the anoxic zone 11 and causing local deposition. The vertically set end, together with the dispersing ring 438 and rotating blade 439 mounted on its inner wall, allows the sludge to be evenly diffused in all directions when discharged, forming an umbrella-shaped or radial dispersion pattern, ensuring that the returned sludge is fully mixed with the wastewater in the anoxic zone 11 and improving sludge utilization efficiency.

[0041] Working principle: After wastewater enters tank 1 through inlet pipe 2, it first flows into the anoxic zone 11. Vertical baffles 411 are arranged perpendicular to the inlet direction, with their top end flush with the top of tank 1 and their bottom end leaving a gap with the bottom of tank 1, forcing the water flow downwards through this gap. Subsequently, the water flow enters the channel between two adjacent sets of vertical baffles 411, encountering horizontal baffles 412 arranged parallel to the inlet direction. Part of the water flow passes through the through holes 413 on the horizontal baffles 412 at high speed, forming a jet, while the remaining water flow continues forward along both sides of the horizontal baffles 412. The alternating action of the straight baffle 411 and the horizontal baffle 412 forms a zigzag flow path that combines vertical and horizontal deflection, which prolongs the hydraulic residence time. At the same time, the guide cone 414 set at the bottom of the pool between two adjacent sets of vertical baffles 411 has its cone tip pointing upward. When the water flows through the gap at the bottom of the vertical baffle 411 at high speed, it impacts the inclined surface of the guide cone 414 and is decomposed into upward and lateral components. The upward component drives the sludge deposited at the bottom of the pool to suspend and participate in the biological reaction, while the lateral component pushes the sludge laterally along the bottom of the pool, eliminating the dead zone of bottom flow. The mixed liquor treated in the anoxic zone 11 flows into the aerobic zone 12 through the funnel-shaped guide hood 421. The narrow end of the guide hood 421 is close to the anoxic zone 11, causing the water flow to accelerate first and then decelerate, smoothly entering the aerobic zone 12. The external air supply equipment delivers high-pressure gas to the central cavity 425 inside the aeration main shaft 424 through the connector 423. The gas enters the nozzle ring 427 through the central cavity 425 and is ejected at high speed from the jet nozzle 428. The outlet direction of the jet nozzle 428 is towards the lower surface of the blades of the impeller 429, and the blades are set in a downward inclined position. The ejected airflow impacts the lower surface of the blades, driving the impeller 429 to continuously rotate the aeration main shaft 424 and the aeration secondary shaft 4210 at the bottom of the frame 422. At the same time, the gas enters the rotating aeration main shaft 424 and the aeration secondary shaft 4210 through the central cavity 425, and is released into the wastewater of the aerobic zone 12 in the form of microbubbles from the aeration holes 426 on the outer arc surface of the two. The rotating aeration secondary shaft 4210 produces a mechanical cutting effect on the bubbles, which further refines the bubbles and distributes them evenly in the water of the aerobic zone 12, thereby improving the oxygen mass transfer efficiency. The mixed liquor treated in the aerobic zone 12 flows upward and overflows from the top of the second baffle 15 into the sedimentation zone 13. The bottom of the second baffle 15 is attached to the bottom of the tank body 1 and the top is lower than the top of the tank body 1, ensuring that the water containing air bubbles at the bottom of the aerobic zone 12 cannot enter the sedimentation zone 13. At the same time, the air baffle 431 fixed on the top of the second baffle 15 near the aerobic zone 12 intercepts the rising air bubbles and guides them to be released to the water surface of the aerobic zone 12. The mixed liquor overflowing into the sedimentation zone 13 first enters the inclined pipe 432. During the flow from high to low in the inclined pipe 432, the flow velocity gradually decreases to achieve energy dissipation and deceleration. The sludge particles in the mixed liquor collide on the inner wall of the inclined pipe 432 and slide down the pipe wall to the lower end, completing the initial sludge-water separation. The water flowing out from the lower end of the inclined pipe 432 continues to rise in the sedimentation zone 13. The suspended sludge settles under the action of gravity and slides down the inclined surface of the V-shaped sludge hopper 433 into the lowest sludge collection tank 434 to accumulate. The clear water is discharged from the outlet pipe 3. The input end of the return pump 435 extends into the sludge collection tank 434, extracts the collected concentrated sludge and sends it to the three-way pipe 436. The three-way pipe 436 divides the sludge into two paths: one path is discharged from the tank 1 as residual sludge, and the other path is transported to the center of the anoxic zone 11 via the return sludge pipe 437. The end of the return sludge pipe 437 is set vertically, and a dispersion ring 438 is rotatably installed on its inner wall. Multiple sets of rotating blades 439 are distributed in a circular array on the inner arc surface of the dispersion ring 438. When the return sludge is discharged from the end of the return sludge pipe 437, the sludge flow drives the rotating blades 439 to rotate the dispersion ring 438, cutting and scattering the return sludge into the water of the anoxic zone 11, so that the sludge is quickly and evenly dispersed, maintaining the biomass stability in the anoxic zone 11.

Claims

1. An integrated biological water treatment plant comprising a basin (1), characterised in that: Also includes: The inlet pipe (2) is installed through and fixedly on the inner wall of one end of the pool body (1) for connecting the external wastewater input pipeline; The outlet pipe (3) is installed through and fixedly on the inner wall of the other end of the pool body (1) to connect to the external pipeline and output the treated water. Anoxic zone (11) is set inside the pool (1) on the side near the inlet pipe (2) to provide a living environment for anaerobic bacteria; The aerobic zone (12) is located in the middle of the pool (1) and is used to provide a living environment for aerobic bacteria; The sedimentation zone (13) is located inside the pool body (1) on the side near the outlet pipe (3) and is used to settle the treated water and settle the impurities in it. A graded treatment unit (4) is set inside the pool body (1) for the zoned treatment of impurities in wastewater; The hierarchical processing unit (4) includes: The flow guiding module (41) is set in the anoxic zone (11) to extend the hydraulic residence time and eliminate hydraulic short circuit; An aeration module (42) is set in the aerobic zone (12) for the uniform release and dispersion of aeration bubbles; The sludge return module (43) is located in the sedimentation zone (13) and is used for sludge reuse and to maintain the biomass in the equipment.

2. An integrated biological water treatment apparatus according to claim 1, wherein: A first baffle (14) is provided between the aerobic zone (12) and the anoxic zone (11), and a second baffle (15) is provided between the aerobic zone (12) and the sedimentation zone (13). Both the first baffle (14) and the second baffle (15) are fixedly connected to the inner wall of the pool body (1).

3. An integrated biological water treatment apparatus according to claim 2, wherein: The flow guiding module (41) includes: Multiple sets of vertical baffles (411) are fixedly installed in a linear array on the inner walls of both sides of the anoxic zone (11) to force the wastewater in the pool (1) to flow around to the bottom of the pool (1); Multiple sets of horizontal baffles (412); arranged between two adjacent sets of vertical baffles (411), used to force the water flow to turn horizontally; Several through holes (413) are evenly distributed on the inner wall of the horizontal baffle (412) to allow part of the flowing water to pass through the through holes (413) to form a jet; Multiple sets of guide cones (414) are evenly distributed between two adjacent sets of vertical baffles (411) to guide the water flow upward and to both sides to form a vortex ring and drive the sludge deposited at the bottom of the pool to suspend.

4. An integrated biological water treatment apparatus according to claim 3, wherein: A gap is provided between the bottom plane of the vertical baffle (411) and the bottom inner wall of the pool body (1), and the top of the vertical baffle (411) is flush with the top surface of the pool body (1). The bottom gap of the vertical baffle (411) is lower than that of the horizontal baffle (412). The vertical baffle (411) is perpendicular to the water inlet direction, and the horizontal baffle (412) is parallel to the water inlet direction.

5. An integrated biological water treatment apparatus according to claim 4, wherein: The aeration module (42) includes: The flow guide (421) is fixedly installed on the inner wall of the first baffle (14) to connect the hypoxic zone (11) and the aerobic zone (12). The frame (422) is fixedly installed on the top of the aerobic zone (12) to provide the installation anchor point for the aeration module (42) in the aerobic zone (12); An aeration main shaft (424) is rotatably mounted on the bottom of the frame (422). An aeration sub-shaft (4210) is fixedly mounted on the side wall of the aeration main shaft (424). A central cavity (425) is opened inside the aeration main shaft (424). Several aeration holes (426) are distributed on the outer arc surfaces of the aeration main shaft (424) and the aeration sub-shaft (4210) for continuously spraying bubbles into the wastewater in the aerobic zone (12). The connector (423) is fixedly connected to the top of the frame (422) and is used to connect the external air supply equipment and the central cavity (425) opened inside the aeration main shaft (424). A nozzle ring (427) is coaxially fixedly installed on the bottom outer wall of the aeration main shaft (424). The inner wall of the nozzle ring (427) is provided with a jet nozzle (428) that is connected to the central cavity (425). An impeller (429) is fixedly installed on the outer wall of the aeration main shaft (424) to drive the aeration main shaft (424) to rotate continuously at the bottom of the frame (422).

6. An integrated biological water treatment apparatus according to claim 5, wherein: The flow deflector (421) is configured as a horn shape including a wide end and a narrow end, and the narrow end of the flow deflector (421) is located on the side close to the hypoxic zone (11).

7. An integrated biological water treatment apparatus according to claim 6, wherein: The blades of the impeller (429) are arranged in a downward inclined position, and the top axis of the nozzle (428) faces the lower surface of the blades of the impeller (429).

8. An integrated biological water treatment apparatus according to claim 7, wherein: The sludge return module (43) includes: A baffle plate (431) is fixedly installed on the top of the second baffle plate (15) near the aerobic zone (12) to guide the air bubbles back to the aerobic zone (12); Inclined pipe (432) is fixedly installed on the inner wall of sedimentation zone (13) in an inclined manner to dissipate energy, slow down the flow of mixed liquid into sedimentation zone (13) and guide sludge to slide down for collection; V-shaped sludge hopper (433) is fixedly installed on the bottom inner wall of the sedimentation zone (13). A sludge collection trough (434) is provided at the lowest point of the V-shaped sludge hopper (433) for collecting and collecting the sludge that has settled in the sedimentation zone (13). A return pump (435) is installed on one side of the tank (1), and the input end of the return pump (435) is installed in the sludge collection tank (434) through the side wall of the tank (1) to extract the sludge deposited in the sludge collection tank (434). A three-way pipe (436) is fixedly installed at the output end of the return pump (435), and a sludge return pipe (437) is fixedly connected to one of the output ports of the three-way pipe (436). The end of the sludge return pipe (437) away from the three-way pipe (436) penetrates the inner wall of the pool body (1) on the side of the anoxic zone (11) to re-input some sludge into the anoxic zone (11). A dispersing ring (438) is rotatably installed on the inner wall of the end of the sludge return pipe (437). The inner arc surface of the dispersing ring (438) is arranged in a circumferential array with multiple sets of rotating blades (439) for dispersing sludge at the tail end of the sludge return pipe (437).

9. An integrated biological water treatment apparatus according to claim 8, wherein: The bottom surface of the second baffle (15) is in contact with the bottom inner wall of the pool body (1), and the top surface of the second baffle (15) is lower than the top surface of the pool body (1). The inclined pipe (432) is oriented towards the top of the second baffle (15) on the side near the water inlet end, while the mud collection tank (434) is located below the inclined pipe (432) on the side near the water inlet end.

10. The integrated biological water treatment equipment according to claim 9, characterized in that: The end of the mud return pipe (437) away from the tee pipe (436) is located at the center of the oxygen-deficient zone (11), and the end of the mud return pipe (437) is set vertically.

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