Sludge circulation reactor

Abstract

The invention discloses a sludge circulation reactor, and relates to the technical field of sewage treatment, the sludge circulation reactor comprises a multi-layer annular nested pool body, a circulation water distribution assembly and an auxiliary assembly, the multi-layer annular nested pool body takes an annular structure as a basis, and comprises an anaerobic zone and at least one anoxic and aerobic zone which is distributed in an annular nested manner; the multi-layer annular nested tank body can be selectively integrated with a built-in settling zone or an adaptive external settling zone for mud-water separation; the circulation water distribution assembly is used for realizing circulation water distribution in the anaerobic zone. According to the invention, through combination of space close combination of a multi-layer annular tank body structure and time intelligent switching of a control system, core functions of various existing sewage treatment processes are creatively integrated, so that the system has the remarkable advantages of intelligent regulation and control, wide application range, extreme energy and carbon saving, great denitrification potential and the like; the comprehensive problems of low volume load, poor water quality and water quantity fluctuation tolerance, high energy consumption and operation cost and the like in the field of sewage biochemical treatment are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a sludge recycling reactor. Background Technology

[0002] The activated sludge process is a core technology in wastewater treatment, degrading organic pollutants in wastewater through the metabolism of microbial communities. Key elements include the microbial community, oxygen, and mixed contact conditions. With the upgrading of wastewater treatment needs, the traditional activated sludge process has given rise to mainstream processes such as oxidation ditches, SBRs, and AOAs. However, existing mainstream processes still have significant shortcomings: Oxidation ditch process: As an early advanced simplified process, it relies on a ring-shaped ditch connected end to end and a delayed aeration mechanism. It simulates a multi-reaction environment through spatial sequence flow, and is stable in operation and easy to manage. It is widely used in small and medium-sized urban wastewater treatment plants. However, due to its extremely high circulation flow ratio, it is difficult to form an effective anaerobic or anoxic zone in the ditch, resulting in a limited variety of pollutants that can be treated. Furthermore, there is an unbalanced relationship between energy consumption and nitrogen removal efficiency, making it unable to meet high-load nitrogen removal requirements. SBR process: Based on the "time for space" strategy, it completes the processes of influent, reaction, sedimentation, effluent, and idle in a single reactor through a time sequence, which can flexibly switch between anaerobic, anoxic, and aerobic environments, and has high nitrogen and phosphorus removal efficiency and compact footprint. However, due to the time-batch treatment mode, its single reaction cycle is relatively short, the pollutant load it can treat is relatively low, it is not tolerant of high concentrations of pollutants, and it has high requirements for automation control technology. It is more suitable for municipal wastewater with low pollutant concentrations. AOA process: With the revolution in carbon source allocation as the core, the traditional AAO sequence of "anaerobic-anoxic-aerobic" is adjusted to "anaerobic-aerobic-anoxic". It prioritizes the use of the original carbon source in the influent to achieve deep denitrification. Although it can achieve the effect of energy saving and carbon saving, the wastewater is highly targeted, the commissioning is difficult, and the bacterial acclimatization period is long. It is difficult to adapt to industrial wastewater with large fluctuations in water quality.

[0003] In summary, the limitations of existing processes are further amplified in high-difficulty industrial wastewater treatment scenarios: SBR and AOA processes, due to their short reaction cycles or short retention times in the pools, are ill-suited for handling high-concentration, complex-composition industrial wastewater; oxidation ditch processes, limited by the types of pollutants treated, cannot adapt to diverse industrial wastewater compositions. Consequently, these issues collectively lead to practical problems in existing processes, including generally low volumetric loading rates, weak resistance to fluctuations in water quality and quantity, high energy consumption, and persistently high overall operating costs. These problems not only hinder the improvement of wastewater treatment efficiency but also fail to meet the environmental protection industry's development demands for low-cost, high-quality wastewater treatment, becoming a key bottleneck preventing the compliant treatment and resource utilization of high-difficulty industrial wastewater. Summary of the Invention

[0004] The purpose of this invention is to provide a sludge recycling reactor to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A sludge recycling reactor, comprising: The multi-layered annular nested pool is based on an annular structure and includes one anaerobic zone and at least one anoxic-aerobic zone distributed along the annular nesting. The multi-layered annular nested pool can selectively integrate a built-in sedimentation zone for mud-water separation or be adapted to an external sedimentation zone. The circulating water distribution assembly is used to achieve circulating water distribution within the anaerobic zone; Auxiliary components are used to be installed in two anoxic and aerobic zones, and to supplement oxygen to the anoxic and aerobic zones and maintain rapid circulation or static sedimentation of wastewater in the anoxic and aerobic zones.

[0006] Preferably, the circulating water distribution assembly includes an annular water distribution trough located at the top of the anaerobic zone, a plurality of vertical water distribution pipes distributed along the circumference of the annular water distribution trough, and circulating water distribution pipes connected one-to-one with the vertical water distribution pipes. The vertical water distribution pipes are grouped into sets of four, and each set of circulating water distribution pipes is located at the bottom of the anaerobic zone. After the wastewater is diverted from the annular water distribution trough to the vertical water distribution pipes, it forms a circulation at the bottom of the anaerobic zone through each set of circulating water distribution pipes.

[0007] Preferably, the multi-layered annular nested pool is arranged from the inside out as a sedimentation zone, an nth anoxic-aerobic zone to a 1st anoxic-aerobic zone, and an anaerobic zone. An anaerobic effluent weir is provided at the top edge of the anaerobic zone. When n ≥ 2, holes for wastewater diversion are respectively opened on the pool walls of the 1st to (n-1th)th anoxic-aerobic zones, and the nth anoxic-aerobic zone is connected to the sedimentation zone via a pipe. When n = 1, the 1st anoxic-aerobic zone is connected to the sedimentation zone via a pipe. The sedimentation zone is connected to a drain pipe for discharging clarified effluent and a sludge discharge pipe for discharging settled sludge. n is a positive integer.

[0008] Preferably, the side wall of the annular water distribution trough is provided with a water distribution hole group corresponding to the position of each group of vertical water distribution pipes, and each group of water distribution holes is provided with a flow regulating device for adjusting the water flow rate of the corresponding water distribution hole group.

[0009] Preferably, a three-phase separator is provided in the anaerobic zone. The three-phase separator is located in the upper middle part of the anaerobic zone, and the sewage in the anaerobic zone flows from bottom to top through the three-phase separator and then enters the anoxic-aerobic zone.

[0010] Preferably, the auxiliary components include an aeration device and multiple submersible propellers disposed in the hypoxic-aerobic zone, and the multiple submersible propellers in each hypoxic-aerobic zone are distributed at intervals along the circumferential direction of the corresponding hypoxic-aerobic zone. The aeration device and the submersible jet generator are automatically controlled to start and stop according to the influent and effluent water quality through an automatic control system, and the control logic can select multiple process modes such as complete mixing, SBR, and AOA.

[0011] Preferably, the circulating water distribution assembly includes a plurality of vertical water distribution pipes distributed along the circumference of the anaerobic zone and branch water distribution pipes connected to each of the vertical water distribution pipes, with each branch water distribution pipe located at the inner bottom of the anaerobic zone.

[0012] Preferably, the multi-layered annular nested pool is arranged from the inside out as follows: an anaerobic zone, a first anoxic-aerobic zone to an nth anoxic-aerobic zone, and an external sedimentation zone. The top edge of the anaerobic zone is provided with an anaerobic overflow weir. When n≥2, the wastewater in the anaerobic zone flows into the first anoxic-aerobic zone through a pipe after passing through the anaerobic overflow weir. Holes for wastewater diversion are respectively opened on the pool walls of the first anoxic-aerobic zone to the (n-1)th anoxic-aerobic zone. The nth anoxic-aerobic zone is connected to the external sedimentation zone through a pipe. When n=1, the first anoxic-aerobic zone is connected to the sedimentation zone through a pipe.

[0013] Preferably, the multi-layered annular nested pool is arranged sequentially from the inside to the outside as an anaerobic zone, a first anoxic-aerobic zone to an nth anoxic-aerobic zone, and a sedimentation zone. The top edges of the anaerobic zone, the nth anoxic-aerobic zone, and the sedimentation zone are each provided with an overflow weir. When n≥2, wastewater in the anaerobic zone flows into the first anoxic-aerobic zone through a pipe after passing through the corresponding overflow weir, and wastewater in the nth anoxic-aerobic zone flows into the sedimentation zone through a pipe after passing through the corresponding overflow weir. Clarified effluent from the sedimentation zone is discharged through a pipe after passing through the corresponding overflow weir. Holes for wastewater diversion are respectively opened on the pool walls of the first anoxic-aerobic zone to the (n-1)th anoxic-aerobic zone. When n=1, the first anoxic-aerobic zone is connected to the sedimentation zone through a pipe.

[0014] Preferably, a traveling scraper is provided in the sedimentation zone. The traveling scraper includes two synchronously running drive motors and is powered by a safety sliding contact line. It is also equipped with limit switches, physical limiters, and an anti-collision system.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: This invention innovatively integrates the core functions of AOA, oxidation ditch, and SBR processes by combining the spatially compact combination of a multi-layered annular pool structure with the time-intelligent switching of the control system. This gives the invention significant advantages such as intelligent regulation, wide applicability, extreme energy saving and carbon reduction, and great denitrification potential. It effectively solves the comprehensive problems in the field of wastewater biochemical treatment, such as low volumetric load, poor tolerance to fluctuations in water quality and quantity, and high energy consumption and operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of Embodiment 1 of the present invention; Figure 2 This is a top view of the structure of Embodiment 1 of the present invention; Figure 3 This is a frontal cross-sectional view of Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the circulating water distribution assembly according to Embodiment 1 of the present invention; Figure 5 This is a three-dimensional structural diagram of Embodiment 2 of the present invention; Figure 6 This is a top view of the structure of Embodiment 2 of the present invention; Figure 7 This is a three-dimensional structural diagram of Embodiment 2 of the present invention; Figure 8 This is a top view of the structure of Embodiment 3 of the present invention.

[0017] In the diagram: 1. Anaerobic zone; 2. Anoxic-aerobic zone; 3. Sedimentation zone; 4. Circular water distribution trough; 5. Vertical water distribution pipe; 6. Circulating water distribution pipe; 7. Anaerobic effluent weir; 8. Drainage pipe; 9. Sludge discharge pipe; 10. Traveling scraper sludge suction machine; 11. Three-phase separator; 12. Submersible thruster. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to embodiments: Example

[0019] like Figures 1-4 As shown, the present invention provides a sludge recycling reactor, comprising a multi-layered annular nested tank, a circulating water distribution assembly, and auxiliary components; wherein, the multi-layered annular nested tank is based on an annular structure and includes one anaerobic zone 1 and at least one anoxic-aerobic zone 2 distributed along the annular nest, and the multi-layered annular nested tank can selectively integrate an internal sedimentation zone 3 for sludge-water separation or be adapted to an external sedimentation zone 3; the circulating water distribution assembly is used to realize the circulating water distribution within the anaerobic zone 1; the auxiliary components are set within the two anoxic-aerobic zones 2 and are used to supplement oxygen to the anoxic-aerobic zones 2 and maintain the rapid circulation of wastewater within the anoxic-aerobic zones 2.

[0020] Furthermore, the circulating water distribution assembly includes an annular water distribution trough 4 located at the top of the anaerobic zone 1, multiple vertical water distribution pipes 5 distributed along the circumference of the annular water distribution trough 4, and circulating water distribution pipes 6 connected one-to-one with the vertical water distribution pipes 5. The vertical water distribution pipes 5 are grouped into sets of four, and the corresponding circulating water distribution pipes 6 of each set are located at the bottom of the anaerobic zone 1. After the wastewater is diverted from the annular water distribution trough 4 to the vertical water distribution pipes 5, it forms a circulation at the bottom of the anaerobic zone 1 through each set of circulating water distribution pipes 6.

[0021] Specifically, in this embodiment, the anaerobic zone 1 adopts a circulating water distribution + circulating water outlet form; when the wastewater is evenly distributed into each vertical water distribution pipe 5 through the annular water distribution trough 4 at the top of the anaerobic zone 1, each set of circulating water distribution pipes 6 can make the wastewater form a circulation at the bottom of the anaerobic zone 1, so that the sludge can contact the wastewater to the maximum extent and improve the mass transfer efficiency.

[0022] Furthermore, the annular water distribution trough 4 has water distribution hole groups on its sidewalls corresponding to the positions of each set of vertical water distribution pipes 5, and each set of water distribution hole groups is equipped with a flow regulating device for adjusting the water flow rate of the corresponding water distribution hole group. Through the design of the flow regulating device, the present invention can adjust the flow rate in each set of vertical water distribution pipes 5 as needed.

[0023] Furthermore, a three-phase separator 11 is provided in the anaerobic zone 1. The three-phase separator 11 is located in the middle and upper part of the anaerobic zone 1, and the sewage in the anaerobic zone 1 flows from bottom to top through the three-phase separator 11 and enters the effluent weir, and then enters the anoxic and aerobic zone 2.

[0024] Specifically, after the wastewater is evenly distributed through the circulating water distribution component in anaerobic zone 1, it flows upward from the bottom of anaerobic zone 1 and passes through the three-phase separator 11. The design of the three-phase separator 11 allows for efficient separation of wastewater, sludge, and biogas. On the one hand, it retains activated sludge in anaerobic zone 1 to maintain a high sludge concentration, ensuring sufficient organic matter degradation and phosphorus release reactions under anaerobic conditions. On the other hand, it prevents sludge from entering the anoxic-aerobic zone 2 with the wastewater, thus avoiding fluctuations in the subsequent treatment load. Therefore, the design of the three-phase separator 11 allows the separated wastewater to stably enter the anoxic-aerobic zone 2 for subsequent treatment.

[0025] Furthermore, the auxiliary components include an aeration device and multiple submersible propellers 12 disposed in the hypoxic-aerobic zone 2, and the multiple submersible propellers 12 in each hypoxic-aerobic zone 2 are distributed at intervals along the circumferential direction of the hypoxic-aerobic zone 2.

[0026] Specifically, multiple submersible jet pumps 12 are used in the anoxic-aerobic zone 2 to powerfully drive the wastewater to circulate rapidly along the circumference of the anoxic-aerobic zone 2. The single-stage reflux ratio can be stably greater than 8, so that the newly entered wastewater can be fully mixed with the mixed liquid in the pool instantly, avoiding uneven treatment caused by local concentration differences.

[0027] Combination Figure 1 and Figure 2 As shown, further, the multi-layered annular nested pool is arranged from the inside to the outside as follows: sedimentation zone 3, nth anoxic-aerobic zone to 1st anoxic-aerobic zone and anaerobic zone 1. The top edge of the anaerobic zone 1 is provided with an anaerobic effluent weir 7. When n is an integer greater than or equal to 2, holes for sewage diversion are opened on the pool walls of the 1st anoxic-aerobic zone to the (n-1th)th anoxic-aerobic zone, and the nth anoxic-aerobic zone is connected to the sedimentation zone 3 through a pipe. When n=1, the 1st anoxic-aerobic zone is connected to the sedimentation zone 3 through a pipe. The sedimentation zone 3 is connected with a drain pipe 8 for discharging clarified effluent and a sludge discharge pipe 9 for discharging settled sludge.

[0028] In this embodiment, the wastewater process from entry to discharge is as follows: After the wastewater flows into the annular distribution trough 4 through the inlet pipe, it is evenly distributed into each vertical distribution pipe 5 through the design of the distribution trough. At the same time, multiple circulations are formed at the bottom of the anaerobic zone 1 through multiple sets of circulating distribution pipes 6, so that the activated sludge in the anaerobic zone 1 can contact the wastewater to the maximum extent. Subsequently, the wastewater can flow upward from the bottom of the anaerobic zone 1 and enter the anaerobic effluent weir 7 after passing through the three-phase separator 11. After the wastewater flows into the anaerobic effluent weir 7, it can flow into the first anoxic-aerobic zone through the corresponding pipe. At this time, the separated wastewater can complete the hydrolysis and oxidation of organic matter and the nitrification of nitrogen in the first anoxic-aerobic zone through the coordinated start and stop of the aeration device and the submersible propeller 12. The process involves chemical and denitrification reactions. Subsequently, when the wastewater can be guided through the holes in the tank wall to the adjacent second anoxic-aerobic zone, the decarbonization, denitrification, and phosphorus removal effects are further enhanced. After treatment in the second anoxic-aerobic zone, the wastewater can then be guided through the holes in the tank wall into the sedimentation zone 3. Finally, the wastewater flowing into the sedimentation zone 3 is discharged from the reactor through the drain pipe 8, while the activated sludge gradually settles in layers and is returned to the anoxic-aerobic zone or discharged from the reactor through the sludge discharge pipe 9 and the sludge return pump. Therefore, compared to the traditional SBR process, this embodiment can cultivate granular sludge more quickly and achieve a higher sludge loading, realizing efficient sludge-water separation while retaining high-quality activated sludge for the reactor, ensuring long-term treatment efficiency. Furthermore, this embodiment, based on the multi-layered nested tank structure and the natural mechanical advantages of its cylindrical structure, can also save on floor space and investment costs.

[0029] In summary, it should also be noted that the sludge recycling reactor proposed in this invention further includes an intelligent control system for intelligent dynamic control of the anoxic-aerobic zone 2, which includes: a water quality detection module, a control module, and an execution module; the water quality detection module is used to detect water quality indicators (COD, ammonia nitrogen, total nitrogen, total phosphorus, etc.) of the anaerobic effluent, the first anoxic-aerobic zone, the second anoxic-aerobic zone adjacent to the first anoxic-aerobic zone, and the sedimentation zone 3; the control module is a PLC controller, used to receive the detection data from the water quality detection module and send control commands to the execution module according to the detection data; the execution module includes a control unit for the aeration device and a control unit for the submersible jet generator 12. Based on this, the control module can adjust the oxygenation intensity, aeration time, and aeration range of the aeration device through the execution module. At the same time, it can also adjust the number and operating time of the submersible propellers 12, so as to realize the dynamic control of the spatial and temporal division of the anoxic and aerobic zone 2, realize the switching of the anaerobic-anoxic-aerobic and anaerobic-anoxic-aerobic processes of the present invention, and ensure that the present invention can complete wastewater treatment and meet the discharge standards with the lowest operating cost.

[0030] The intelligent control system can also realize the aerobic granular sludge cultivation function based on intelligent control and continuous influent. When aerobic granular sludge cultivation is carried out, the control module can adjust the running time of the submersible jet mixer 12 through the execution module, stopping the submersible jet mixer 12 corresponding to the reaction zone near the inner layer, making the inner layer a sedimentation tank. Under the cyclic shearing action of aeration by the aeration device, stirring by the submersible jet mixer 12, and sedimentation in the sedimentation tank, light sludge flocs are discharged, promoting the growth of heavy flocs into granular sludge. Compared with the traditional SBR process, the granular sludge cultivation speed is greatly accelerated, while forming a higher sludge load, balancing treatment efficiency and process flexibility. It should be noted that since this invention is a ring-shaped pool, relying on the sufficiently long flow channel of the ring-shaped pool, the short-flow problem when influent and sedimentation occur simultaneously can be avoided.

[0031] The technical effects achieved in this embodiment are as follows: by tightly combining the multi-layered annular pool structure in space and intelligently switching the control system in time, the main functions of the AOA process, oxidation ditch process, and SBR process are integrated into one, which has the advantages of intelligence, wide applicability (it can treat low-concentration municipal sewage and high-concentration industrial wastewater, breaking through the targeted limitations of traditional processes), extreme energy saving (intelligent adjustment of aeration and flow to reduce energy consumption), carbon saving (using internal carbon sources for deep denitrification, reducing the addition of external carbon sources to achieve carbon saving), and huge denitrification potential; it solves the comprehensive problems of low volumetric loading, poor tolerance to fluctuations in water quality and quantity, high energy consumption, and high operating costs in sewage biochemical treatment. Example

[0032] like Figures 5-6As shown, this embodiment is largely the same as Implementation 1 in terms of structure and scheme, but differs in that: the multi-layered annular nested tank is arranged from the inside out as follows: anaerobic zone 1, the first anoxic-aerobic zone to the nth anoxic-aerobic zone, and an external sedimentation zone 3. The top edge of the anaerobic zone 1 is provided with an anaerobic overflow weir. When n is an integer greater than or equal to 2, the sewage in the anaerobic zone 1 flows into the first anoxic-aerobic zone through the anaerobic overflow weir and a pipe. Holes for sewage diversion are opened on the tank walls of the first anoxic-aerobic zone to the (n-1)th anoxic-aerobic zone. The nth anoxic-aerobic zone is connected to the external sedimentation zone 3 through a pipe, or operates in SBR mode. When n=1, the first anoxic-aerobic zone is connected to the sedimentation zone 3 through a pipe.

[0033] Furthermore, the circulating water distribution assembly includes multiple vertical water distribution pipes 5 distributed along the circumference of the anaerobic zone 1, and branch water distribution pipes connected one-to-one with the vertical water distribution pipes 5. Each branch water distribution pipe is located at the inner bottom of the anaerobic zone 1.

[0034] Furthermore, in this embodiment, the water distribution method of the circulating water distribution component includes, but is not limited to, the water distribution of the branch water distribution pipes mentioned above. The circulating water distribution system in Embodiment 1 can also be used to achieve circulating water distribution.

[0035] In this embodiment, the process of wastewater entering and exiting is as follows: wastewater is first transported from the top of anaerobic zone 1 to the bottom of the tank through vertical water distribution pipe 5, and then uniformly distributed by branch water distribution pipes at the bottom of anaerobic zone 1; after water distribution, wastewater can flow upward from the bottom of anaerobic zone 1, pass through the three-phase separator 11 located in the upper part of anaerobic zone 1, and enter the anaerobic overflow weir of anaerobic zone 1 after three-phase separation; then the wastewater can flow into the first anoxic-aerobic zone through the pipe connected to the anaerobic overflow weir, and complete the organic matter oxidation and nitrogen nitrification and denitrification reactions through the start and stop of the aeration device and the submersible propeller 12. Then, the wastewater is guided through the holes on its tank wall to the second anoxic-aerobic zone adjacent to the first anoxic-aerobic zone, further enhancing the carbon oxidation and nitrogen nitrification, denitrification and phosphorus removal effects; finally, it can be guided into the external sedimentation zone 3 through the pipe to complete the subsequent mud-water separation. Example

[0036] like Figures 7-8As shown, this embodiment is largely the same as Implementation 1 in structure and scheme, but differs in that: the multi-layered annular nested pool is arranged sequentially from the inside to the outside as an anaerobic zone 1, the first anoxic-aerobic zone to the nth anoxic-aerobic zone, and a sedimentation zone 3. Overflow weirs are provided at the top edges of the anaerobic zone 1, the nth anoxic-aerobic zone, and the sedimentation zone 3. When n is an integer greater than or equal to 2, the wastewater in the anaerobic zone 1 flows into the first anoxic-aerobic zone through a pipe after passing through the corresponding overflow weir. The wastewater in the nth anoxic-aerobic zone flows into the sedimentation zone 3 through a pipe after passing through the corresponding overflow weir. The clarified effluent in the sedimentation zone 3 is discharged through a pipe after passing through the corresponding overflow weir. The sludge at the bottom of the sedimentation zone 3 is removed by a sludge scraper and returned to the anoxic-aerobic zone. Holes for wastewater diversion are provided on the pool walls of the first anoxic-aerobic zone to the (n-1)th anoxic-aerobic zone. When n=1, the first anoxic-aerobic zone is connected to the sedimentation zone through a pipe.

[0037] Furthermore, an inlet trough is provided in the sedimentation zone 3; thus, when the sewage from the second anoxic-aerobic zone adjacent to the first anoxic-aerobic zone enters its own overflow weir, it can pass through the pool wall through the pipe and enter the inlet trough of the sedimentation zone 3, and form a U-shaped circulation under its action, and finally be discharged from the outlet weir of the sedimentation zone 3.

[0038] Furthermore, in this embodiment, the water distribution method of the circulating water distribution component includes, but is not limited to, the branch water distribution pipe water distribution in Embodiment 2, and the circulating water distribution system in Embodiment 1 can also be used to achieve circulating water distribution.

[0039] The sedimentation zone 3 is equipped with a traveling scraper 10, which includes two synchronously running drive motors. The traveling scraper 10 is powered by a safety sliding contact line and is equipped with limit switches, physical limiters and anti-collision systems.

[0040] Furthermore, the traveling scraper / suction sludge machine 10 is equipped with two synchronously operating drive motors, corresponding to the inner and outer wheels respectively. Since the sedimentation zone 3 has a ring-shaped structure, the inner and outer track radii differ, requiring the electronic control system to ensure the linear speeds of the two wheels are matched (satisfying the linear speed ratio = radius ratio, i.e., Vinner / Vouter = Rinner / Router). The specific control logic is as follows: a frequency converter (VFD) independently controls each of the two drive motors, and an encoder collects the wheel speed signals in real time and feeds them back to the PLC. The PLC automatically calculates and dynamically adjusts the running speeds of the two motors based on the preset inner and outer ring track radius parameters, achieving electronic differential control. This principle is similar to a tank turning, ensuring the scraper / suction sludge machine runs smoothly along the ring track, preventing wheel slippage or track wear.

[0041] Furthermore, in this implementation, the sludge scraper uses a safety sliding power line for power supply, which is the best solution for circular operation scenarios. The circular sliding power line can be installed inside or beside the track, and power is drawn from the sliding power line through the matching current collector (carbon brush), providing continuous and stable power support for the crane, avoiding the entanglement and wear problems caused by traditional cable dragging, and improving the reliability of equipment operation.

[0042] Furthermore, dual protection can be provided by limit switches and physical limiters. When the sludge scraper reaches the preset boundary of the circular track, the limit switch triggers a signal to cut off the running command, while the physical limiter prevents the equipment from exceeding the operating range through mechanical blocking, thus avoiding structural collision damage.

[0043] If multiple traveling scraper-suction sludge machines 10 are configured on the same circular track, an additional anti-collision system needs to be installed to monitor the distance between adjacent devices in real time. When the distance is less than the safety threshold, a deceleration or stop command will be automatically triggered to prevent collisions from occurring when multiple devices are running.

[0044] In addition, the sludge scraper design in this embodiment can be adapted to the tank layout of "anaerobic-anoxic-aerobic-anoxic-aerobic-sedimentation" from the inside to the outside. Through precise drive control and stable operation protection, it ensures the efficient collection and discharge of heavy flocs and granular sludge in the sedimentation zone, and guarantees the sludge-water separation effect.

[0045] In this embodiment, the process of wastewater entering and exiting is as follows: wastewater is first transported from the top of anaerobic zone 1 to the bottom of the tank via vertical distribution pipe 5, and then uniformly distributed by branch distribution pipes or a circulating distribution system at the bottom of anaerobic zone 1; after distribution, the wastewater can flow upward from the bottom of anaerobic zone 1, pass through the three-phase separator 11 located in the upper part of anaerobic zone 1, and enter the anaerobic overflow weir of anaerobic zone 1 after three-phase separation; subsequently, the wastewater can flow into the first anoxic-aerobic zone through the pipe connected to the anaerobic overflow weir, and through the synergistic effect of the aeration device and the submersible propeller 12 After nitrification is completed, the wastewater is then guided through the holes in the pool wall to the second anoxic-aerobic zone adjacent to the first anoxic-aerobic zone, further enhancing the oxidation of organic matter, denitrification, and phosphorus uptake. Finally, when the wastewater in the second anoxic-aerobic zone enters its own overflow weir, it can pass through the pool wall via pipes into the inlet tank of sedimentation zone 3, and then flow evenly into sedimentation zone 3 through the distribution pipes. During this process, a U-shaped circulation or plug flow can be formed. The supernatant is finally discharged from the effluent weir of sedimentation zone 3, and the sludge is discharged through a sludge scraper after settling, completing the sludge-water separation.

[0046] It should be noted that the present invention also includes a staircase area and a walkway area to meet the daily passage, equipment inspection and maintenance needs of staff.

[0047] It should be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0048] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A sludge recycling reactor, characterized in that, include: The multi-layered annular nested pool is based on an annular structure and includes one anaerobic zone and at least one anoxic-aerobic zone distributed along the annular nesting. The multi-layered annular nested pool can selectively integrate an internal sedimentation zone for mud-water separation or be adapted to an external sedimentation zone. The circulating water distribution assembly is used to achieve circulating water distribution within the anaerobic zone; The auxiliary components are used to be installed in the anoxic-aerobic zone and to supplement oxygen to the anoxic-aerobic zone and maintain the rapid circulation of wastewater in the anoxic-aerobic zone.

2. The sludge recycling reactor according to claim 1, characterized in that: The circulating water distribution assembly includes an annular water distribution trough located at the top of the anaerobic zone, multiple vertical water distribution pipes distributed along the circumference of the annular water distribution trough, and circulating water distribution pipes connected to the vertical water distribution pipes one by one. The vertical water distribution pipes are grouped into sets of four, and the corresponding circulating water distribution pipes of each set are located at the bottom of the anaerobic zone. After the wastewater is diverted from the annular water distribution trough to the vertical water distribution pipes, it forms a circulation at the bottom of the anaerobic zone through each set of circulating water distribution pipes.

3. A sludge recycling reactor according to claim 2, characterized in that: The multi-layered annular nested pool is arranged from the inside out as a sedimentation zone, an nth anoxic-aerobic zone to a 1st anoxic-aerobic zone, and an anaerobic zone. The top edge of the anaerobic zone is provided with an anaerobic effluent weir. When n≥2, the pool walls of the 1st anoxic-aerobic zone to the (n-1th)th anoxic-aerobic zone are respectively provided with holes for sewage diversion, and the nth anoxic-aerobic zone is connected to the sedimentation zone through a pipe. When n=1, the 1st anoxic-aerobic zone is connected to the sedimentation zone through a pipe.

4. A sludge recycling reactor according to claim 2, characterized in that: The annular water distribution trough has a water distribution hole group on the side wall corresponding to the position of each group of vertical water distribution pipes. Each group of water distribution holes is equipped with a flow regulating device for adjusting the water flow rate of the corresponding water distribution hole group.

5. A sludge recycling reactor according to claim 3, characterized in that: The sedimentation zone is connected to a drainage pipe for discharging clarified effluent and a sludge discharge pipe for discharging settled sludge.

6. A sludge recycling reactor according to claim 1, characterized in that: The anaerobic zone is equipped with a three-phase separator, which is located in the upper middle part of the anaerobic zone. The wastewater in the anaerobic zone flows from bottom to top through the three-phase separator and then enters the anoxic-aerobic zone.

7. A sludge recycling reactor according to claim 1, characterized in that: The auxiliary components include an aeration device and multiple submersible propellers located in the hypoxic-aerobic zone, and the multiple submersible propellers in each hypoxic-aerobic zone are distributed at intervals along the circumferential direction of the corresponding hypoxic-aerobic zone. The aeration device and the submersible jet generator are automatically controlled to start and stop according to the influent and effluent water quality through an automatic control system, and the control logic can select multiple process modes such as complete mixing, SBR, and AOA.

8. A sludge recycling reactor according to claim 1, characterized in that: The multi-layered annular nested pool is arranged sequentially from the inside out as an anaerobic zone, a first anoxic-aerobic zone to an nth anoxic-aerobic zone, and an external sedimentation zone. An anaerobic overflow weir is provided at the top edge of the anaerobic zone. When n≥2, wastewater in the anaerobic zone flows into the first anoxic-aerobic zone through a pipe after passing through the anaerobic overflow weir. Holes for wastewater diversion are respectively opened on the pool walls of the first to (n-1)th anoxic-aerobic zones. The nth anoxic-aerobic zone is connected to the external sedimentation zone through a pipe. When n=1, the first anoxic-aerobic zone is connected to the sedimentation zone through a pipe.

9. A sludge recycling reactor according to claim 1, characterized in that: The multi-layered annular nested pool is arranged sequentially from the inside out as an anaerobic zone, a first anoxic-aerobic zone to an nth anoxic-aerobic zone, and a sedimentation zone. Each of the anaerobic zone, the nth anoxic-aerobic zone, and the sedimentation zone has an overflow weir at its top edge. When n ≥ 2, wastewater in the anaerobic zone flows through the corresponding overflow weir into the first anoxic-aerobic zone via a pipe. Wastewater in the nth anoxic-aerobic zone flows through the corresponding overflow weir into the sedimentation zone via a pipe. Clarified effluent from the sedimentation zone is discharged through the corresponding overflow weir via a pipe. Holes for wastewater diversion are provided on the pool walls of the first to n-1 anoxic-aerobic zones. When n = 1, the first anoxic-aerobic zone is connected to the sedimentation zone via a pipe.

10. A sludge recycling reactor according to claim 9, characterized in that: The sedimentation zone is equipped with a traveling scraper and suction machine, which includes two synchronously running drive motors. The traveling scraper and suction machine is powered by a safety sliding contact line and is equipped with limit switches, physical limiters and anti-collision systems.

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