A multi-flow stabilization control system for internal and external reflux pump sets

Abstract

This application relates to the field of wastewater treatment technology, specifically disclosing a multi-flow stabilization control system for internal and external recirculation pump sets. It aims to solve the problem of insufficient flexibility caused by the single recirculation mode and lack of emergency control measures in existing systems. The system includes: a first and second biological tank series equipped with key variable frequency pumps, a multi-functional fluid switching network, and an intelligent stabilization module. The switching network connects the two pump series across series via interconnected pipes and valve groups; the intelligent stabilization module controls the valves and pump frequency according to real-time operating conditions, enabling flexible switching between venting, emergency water distribution, rapid recovery, and cross-recirculation modes. This application breaks through the limitations of traditional single-line operation, significantly improving the system's resilience, load-bearing capacity, and nitrogen and phosphorus removal efficiency, while reducing operating costs.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-flow stabilization system for internal and external reflux pump sets. Background Technology

[0002] Wastewater treatment, as a core component of municipal infrastructure and environmental protection, typically employs a parallel operation of multiple biological treatment tanks to achieve continuous biochemical degradation of large-scale wastewater. Within these biological treatment units, the construction of complex microbial ecosystems and the utilization of activated sludge's metabolic processes to remove organic matter, nitrogen, and phosphorus from the water are fundamental to ensuring effluent quality meets standards. The continuity and stability of these systems directly impact urban drainage safety and the quality of the ecological environment.

[0003] In the specific operation of biological treatment ponds, the internal recirculation system plays a crucial role in transporting nitrified liquor from the aerobic zone to the anoxic zone, and is a key technical means to achieve efficient nitrogen and phosphorus removal. Existing internal recirculation systems are usually built independently for each treatment series, with the internal recirculation pumps and their associated pipelines of each series exhibiting a highly fixed configuration. Their functional attributes are strictly limited to a specific closed-loop recirculation path during the design phase, resulting in a physical layout where each operating series is not interconnected and has a single function.

[0004] Traditional internal recirculation systems, due to their independent physical isolation of each series, limit pumps and pipelines to a single, pre-defined recirculation task. This rigid equipment configuration renders the system incapable of cross-series fluid scheduling and functional replacement when facing unsteady conditions such as single-series venting for maintenance, peak rainfall loads, or system startup and recovery. Limited by the inflexible pump functionality, single-series maintenance venting often overloads the venting pipeline and induces severe hydraulic shocks in the influent system, significantly extending the pre-maintenance cycle and hindering the rapid allocation of activated sludge resources during the recovery phase. In this situation, the system lacks the necessary emergency water allocation flexibility to cope with sudden fluctuations in water volume, causing previously fixed equipment to become a bottleneck under abnormal conditions. Ultimately, this results in a severe deficiency in the overall adaptability and operational resilience of the biological treatment system under changing scenarios, becoming a pressing technical challenge restricting the refined management and safe, stable operation of wastewater treatment plants. Summary of the Invention

[0005] This application provides a multi-flow stabilization and control system for internal and external reflux pump sets, which aims to solve the technical problems of existing sewage treatment systems, such as the single internal and external reflux operating conditions, independent operation of each treatment series, and lack of emergency control measures, resulting in insufficient flexibility of the system when facing maintenance venting, water volume shocks, and biological system recovery.

[0006] This application provides a multi-flow stabilization and control system for internal and external reflux pump groups, including: a first biological pool series, a second biological pool series, a multi-functional fluid switching network, and an intelligent stabilization and control module;

[0007] Both the first biological tank series and the second biological tank series are equipped with an internal reflux pump group, which includes at least one key variable frequency pump. The multifunctional fluid switching network includes an interconnected piping system and a multifunctional valve group. The interconnected piping system connects the key variable frequency pumps in the first biological tank series with the key variable frequency pumps in the second biological tank series across series. The multifunctional valve group includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, and a sixth valve installed on the interconnected piping system. The outlet pipes of the interconnected piping system extend to the return outlet point in the first biological tank series, the return outlet point in the second biological tank series, and the main outlet channel of the biological tanks, respectively. The intelligent stability control module, based on real-time monitoring of operating conditions, controls the opening and closing status of the multi-functional valve group and the frequency of the key variable frequency pump, thereby enabling flexible switching of pump functions under different operating conditions.

[0008] In one embodiment of the present invention, the intelligent control module is configured with a single-series venting mode; when the second biological tank series needs to be vented for maintenance, the intelligent control module controls the first valve, the second valve, the third valve, and the fifth valve to be in the closed state, and controls the fourth valve and the sixth valve to be in the open state, so that the key variable frequency pump in the second biological tank series operates as a dedicated venting pump, and discharges the mixed liquid in the second biological tank series to the main outlet channel of the biological tank through the interconnected pipeline system.

[0009] In one embodiment of the present invention, the intelligent stabilization and control module is configured with an emergency water diversion mode. When the external water inflow exceeds the system load threshold and needs to be diverted to the sedimentation components of the first biological tank series or the second biological tank series, the intelligent stabilization and control module controls the first valve, the second valve, the fourth valve, and the fifth valve to be in the closed state, and controls the third valve and the sixth valve to be in the open state, so that the key variable frequency pump in the first biological tank series operates as an emergency distribution pump, thereby realizing the water load allocation between series.

[0010] In one embodiment of the present invention, the intelligent stability control module is configured with a rapid recovery mode. During the recovery and cultivation period after the maintenance of the biological tank series, the intelligent stability control module controls the first valve, the fifth valve, the sixth valve, and the fourth valve to be in the closed state, and controls the second valve and the third valve to be in the open state, so that the key variable frequency pump in the first biological tank series operates as a sludge adjusting pump, and quickly transports the activated sludge in the first biological tank series to the second biological tank series, thereby shortening the start-up cycle of the biological system.

[0011] As one embodiment of the present invention, the intelligent stabilization and control module is configured with a cross-flow mode; when both series of biological tanks are in normal operation, the intelligent stabilization and control module adjusts the multi-functional valve group to achieve real-time complementarity of the internal flow between the first biological tank series and the second biological tank series, and performs optimized allocation of sludge resources according to the difference in sludge concentration of each series.

[0012] As one embodiment of the present invention, the internal reflux pipeline multi-flow stabilization system further includes a dual internal reflux subsystem. The dual internal reflux subsystem is provided with two independent reflux paths. Both reflux paths draw water from the micro-aerobic zone at the end of the biological aeration tank and perform degassing treatment before entering the anoxic zone to ensure that the dissolved oxygen concentration in the reflux liquid is less than 0.5 mg / L. The return point of the first internal return path is located at the beginning of the anoxic section, and its return flow accounts for 60% of the total internal return flow. It is used to transport the nitrified liquid to the front end of the anoxic section and complete the denitrification process using the organic carbon source in the influent. The reflux point of the second internal reflux path is located in the third zone in the middle and rear of the anoxic section. Its reflux volume accounts for 40% of the total internal reflux volume. It is used to introduce a mixed liquor containing an internal carbon source after the nitrate nitrogen concentration has been degraded to a preset value, and to cooperate with the external carbon source added here, which accounts for 70% of the total addition, to carry out deep denitrification.

[0013] As one embodiment of the present invention, the internal reflux pipeline multi-flow stabilization system further includes a dual external reflux subsystem. The dual external reflux subsystem draws water from the secondary sedimentation tank mud well and degasses it until the dissolved oxygen concentration is below 0.2 mg / L, then divides it into two reflux paths. The return point of the first external return path is located at the beginning of the anaerobic zone, and its return flow accounts for 30% of the total external return flow. The intelligent stabilization module uses the oxidation-reduction potential and sludge concentration in the middle of the anaerobic section as control indicators to control the oxidation-reduction potential of the anaerobic section below -150 millivolts. The return point of the second external return path is located in the anoxic zone 1, and its return flow accounts for 70% of the total external return flow. The returned sludge is enriched with denitrifying polysaccharide bacteria and denitrifying phosphorus removal bacteria.

[0014] As one embodiment of the present invention, the dual external reflux subsystem adopts a carbon source starvation and abundance alternation acclimatization method to activate the denitrifying polysaccharide bacteria and the denitrifying phosphorus removal bacteria to carry out endogenous denitrification using polyhydroxyalkanoates stored in the microorganisms, thereby achieving the degradation of more than 50% of nitrate nitrogen within 12 hours under conditions without external carbon source, and simultaneously reducing the orthophosphate concentration.

[0015] As one embodiment of the present invention, the intelligent stability control module dynamically adjusts the operating power of the key variable frequency pumps based on the real-time liquid level, flow rate parameters and sludge concentration data of the first biological tank series and the second biological tank series through a variable frequency control algorithm, so as to ensure the stability and accuracy of fluid delivery under different operating scenarios.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention, by constructing a multifunctional fluid switching network, breaks through the limitations of traditional single-line operation of internal recirculation systems, realizing the flexible transformation of key equipment from fixed functions to multi-dimensional process support functions. The system possesses four core functions: single-series high-efficiency venting, emergency water distribution during peak loads, rapid recirculation cultivation after maintenance, and dual-series cross-recirculation, significantly improving the resilience and adaptability of the biochemical treatment system. In practical engineering applications, this system has shortened the venting time of the biological tank by 50%, and under flood season or large water volume impacts, the water volume load carrying capacity of the single series has increased to 212%, effectively reducing the risk of effluent quality exceeding standards. Furthermore, through the synergistic optimization of the dual internal and dual external recirculation systems, precise allocation of carbon sources in the spatiotemporal dimensions is achieved. While ensuring nitrogen and phosphorus removal efficiency, it significantly reduces the amount of external carbon source added and system operating costs, generating direct economic benefits of over 400,000 yuan annually. This provides solid technical support for the refined management and safe and stable operation of wastewater treatment plants. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall technical solution architecture of the present invention; Figure 2 This is a schematic diagram of the core principle framework of the synergistic effect between the multifunctional fluid switching network and the intelligent stability control module in this invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Reference Figure 1 , Figure 1 This is a schematic diagram of the overall technical architecture of an internal reflux pipeline multi-flow stabilization control system proposed in an embodiment of this application. Figure 1 As shown, the system includes: a first biological pool series, a second biological pool series, a multi-functional fluid switching network, and an intelligent stability control module.

[0025] Both the first and second biological tank series are equipped with internal reflux pump sets, each including at least one key variable frequency pump. A multi-functional fluid switching network connects the key variable frequency pumps in the first and second biological tank series via an interconnected piping system, breaking down the physical isolation of each biochemical treatment unit's independent operation. The intelligent stability control module is electrically connected to the on-site level gauges, flow meters, and frequency controllers of the key variable frequency pumps. Based on real-time monitoring of operating conditions, it controls the opening and closing status of the multi-functional valve group and the operating frequency of the key variable frequency pumps, enabling flexible switching of pump functions under different operating conditions.

[0026] In this embodiment, a multi-functional fluid switching network serves as the core actuator. Its internal interconnected pipeline system includes valves 1, 2, 3, 4, 5, and 6. These valves, forming a multi-functional valve group, alter the fluid's topological path within the interconnected pipeline system through different opening and closing combinations. The outlet pipes of the interconnected pipeline system extend to the return outlet points within the first biological tank series, the second biological tank series, and the main outlet channel of the biological tanks, thus providing multi-directional physical channels for fluid scheduling under different operating conditions. By constructing this multi-dimensional switching network, this application enables the key variable frequency pump, which originally only performed a single return task, to also handle venting, water distribution, and sludge adjustment tasks, greatly improving the system's engineering adaptability and flexibility.

[0027] Reference Figure 2 , Figure 2 This is a schematic diagram illustrating the core principle framework of the synergistic effect between the multifunctional fluid switching network and the intelligent stability control module in this invention. (For example...) Figure 2 As shown, the intelligent stability control module is configured with multiple execution modes, including single-series venting mode, emergency water diversion mode, rapid recovery mode, and cross-flow mode.

[0028] In one embodiment, the intelligent control module is configured with a single-series venting mode. In the pre-trigger state where the second biological tank series requires venting maintenance, the intelligent control module determines the maintenance command is valid and then drives the multi-functional valve group to perform actions: controlling valves 1, 2, 3, and 5 to enter a fully closed state, while simultaneously driving valves 4 and 6 to switch to a fully open state. At this time, a directional flow channel is formed within the interconnected pipeline system, pointing from the second biological tank series to the main outlet channel of the biological tanks. In the intermediate execution state, the key variable frequency pump in the second biological tank series operates as a dedicated venting pump, discharging the mixed liquid in the tanks to the main outlet channel of the biological tanks via the interconnected pipeline system. In the feedback steady state, the intelligent control module adjusts the pump frequency according to the real-time liquid level changes of the second biological tank series until the liquid level drops to the preset venting threshold, effectively shortening the preparation cycle before maintenance.

[0029] In one embodiment, the intelligent water control module is equipped with an emergency water distribution mode. In an abnormal state where the external inflow exceeds the system load threshold, the intelligent water control module identifies the impact load through a flow sensor and executes a command mapping: controlling valves 1, 2, 4, and 5 to be closed, and controlling valves 3 and 6 to be open. In this state, the key variable frequency pump in the first biological tank series transforms into an emergency distribution pump, diverting excess water to the main effluent channel of the biological tank or a designated series of sedimentation components through the interconnected pipeline system. This achieves forced and precise allocation of water load between series, preventing sludge loss due to overload of the biological system.

[0030] In one embodiment, the intelligent stability control module is equipped with a rapid recovery mode. After the biological tank series undergoes maintenance and enters the initialization phase of recovery cultivation, the intelligent stability control module executes the following logical judgment: controlling valves 1, 5, 6, and 4 to be closed, and controlling valves 2 and 3 to be open. At this time, the key variable frequency pump in the first biological tank series operates as a sludge conditioning pump. The physical conduction mechanism is as follows: the high-concentration activated sludge in the first biological tank series is rapidly transported to the second biological tank series to be restored via the interconnected pipeline system, driven by the kinetic energy of the pump. This process achieves cross-series instant inoculation of microbial communities, significantly shortening the functional reconstruction time of the biochemical system.

[0031] In one embodiment, the intelligent stabilization module is configured with a cross-flow mode. Under steady-state conditions where both biological tanks are operating normally, the intelligent stabilization module acquires real-time sludge concentration and nitrate nitrogen data for each series. By dynamically adjusting the opening of the multi-functional valve group, it achieves real-time complementarity of the internal flow between the first and second biological tank series. Based on the differences in sludge concentration among the series, the system automatically optimizes the allocation of sludge resources to ensure a balanced overall system treatment efficiency.

[0032] In one embodiment, this application also provides a dual internal reflux subsystem, which has two independent reflux paths, both drawing water from the micro-aerobic zone at the end of the biological aeration tank. Before entering the anoxic zone, the fluid undergoes degassing treatment via a physical degassing device, and tiny air bubbles are removed through an exhaust valve assembly to ensure that the dissolved oxygen concentration in the reflux liquid remains constant below 0.5 mg / L.

[0033] The recirculation point of the first internal recirculation path is located at the beginning of the anoxic section, and its recirculation flow accounts for 60% of the total internal recirculation flow. During operation, the system utilizes the high concentration of organic carbon source in the influent to enable the nitrifying liquid to quickly complete primary denitrification at the beginning of the anoxic section.

[0034] The reflux point of the second internal reflux path is located in Zone 3, in the latter part of the anoxic section, and its reflux volume accounts for 40% of the total internal reflux volume. When the intelligent stabilization module detects that the nitrate nitrogen concentration has degraded to a preset threshold, a mixed liquor containing an internal carbon source is introduced, along with an external carbon source accounting for 70% of the total dosage, to perform deep secondary denitrification. This segmented reflux mechanism achieves precise mapping of the carbon source in the spatiotemporal dimensions, greatly improving the nitrogen removal efficiency.

[0035] In one embodiment, this application also provides a dual external reflux subsystem. This subsystem extracts concentrated sludge from the secondary sedimentation tank sludge well via a reflux pump, reduces the dissolved oxygen concentration to below 0.2 mg / L in a degassing unit, and then distributes the sludge in two separate streams.

[0036] The return point of the first external return path is located at the beginning of the anaerobic zone, and its return flow accounts for 30% of the total external return flow. The intelligent stabilization module uses the oxidation-reduction potential (ORP) and sludge concentration in the middle of the anaerobic zone as feedback indicators, and uses frequency conversion commands to stably control the ORP of the anaerobic zone below -150 mV, ensuring efficient phosphorus release by phosphorus-holding bacteria.

[0037] The return point of the second external return path is located in Zone 1 of the anoxic zone, and its return flow accounts for 70% of the total external return flow. The sludge returned through this path is pre-enriched with denitrifying polysaccharide bacteria and denitrifying phosphorus-removing bacteria, which utilize their biological characteristics to perform subsequent advanced purification treatment.

[0038] In this embodiment, the dual external reflux subsystem employs a carbon source starvation and abundance alternation acclimatization method. Through periodic substrate concentration fluctuations, it activates the physicochemical ability of denitrifying polysaccharide bacteria and denitrifying phosphorus-removing bacteria to utilize the polyhydroxyalkanoates (PHAs) stored within the microorganisms for endogenous denitrification. Under extreme conditions without an external carbon source, the system can degrade more than 50% of nitrate nitrogen within 12 hours and simultaneously reduce orthophosphate concentration, achieving low-cost simultaneous nitrogen and phosphorus removal.

[0039] In this embodiment, the intelligent stability control module calls upon the internally stored variable frequency control algorithm based on the real-time liquid level, flow rate parameters, and sludge concentration data of the first and second biological tank series. This algorithm uses the deviation between the target flow rate and the measured flow rate as a criterion, and dynamically adjusts the operating frequency of key variable frequency pumps through PID control logic, ensuring stable pressure and accurate flow rate during fluid transport in various switching scenarios such as venting, water separation, and recirculation.

[0040] In summary, this application achieves "one pump for multiple uses" and "cross-series collaboration" for key equipment in biochemical treatment processes by constructing a multifunctional fluid switching network and an intelligent stability control module. While ensuring efficient venting and emergency diversion within a single series, the system optimizes the carbon source distribution path through precise coupling of dual internal and external reflux subsystems, significantly improving the system resilience of wastewater treatment plants under complex and fluctuating operating conditions. This stability control scheme, based on physical topology switching and logical intelligent driving, not only reduces equipment redundancy costs but also achieves significant energy savings in reagents and operational economic benefits while improving water quality stability.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-flow stabilization and control system for internal and external reflux pump sets, characterized in that, include: The first biological pool series and the second biological pool series are both equipped with an internal reflux pump group, which includes at least one key variable frequency pump. A multifunctional fluid switching network includes an interconnected piping system and a multifunctional valve group. The multifunctional valve group includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, and a sixth valve installed on the interconnected piping system. The interconnected piping system connects key variable frequency pumps in the first biological tank series with key variable frequency pumps in the second biological tank series across series. The outlet pipes of the interconnected piping system extend to the return outlet point in the first biological tank series, the return outlet point in the second biological tank series, and the main outlet channel of the biological tanks. The intelligent stability control module is used to control the opening and closing status of the multi-functional valve group and the operating frequency of the key variable frequency pump according to the real-time monitored operating conditions, so as to realize the switching of pump body functions under different operating conditions.

2. The multi-flow stabilization system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent control module is equipped with a single-series venting mode. When the second biological tank series needs to be vented for maintenance, the intelligent control module controls the first valve, the second valve, the third valve, and the fifth valve to be closed, and controls the fourth valve and the sixth valve to be open, so that the key variable frequency pump in the second biological tank series can operate and discharge the mixed liquid in the second biological tank series to the main outlet channel of the biological tank through the interconnected pipeline system.

3. The multi-flow stabilization system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent control module is equipped with an emergency water diversion mode. When the external water inflow exceeds the system load threshold and diversion is required, the intelligent control module controls the first valve, the second valve, the fourth valve, and the fifth valve to be closed, and controls the third valve and the sixth valve to be open, so that the key variable frequency pump in the first biological tank series can operate as an emergency distribution pump.

4. The multi-flow stabilization system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent control module is equipped with a rapid recovery mode. During the recovery and cultivation period after maintenance of the biological tank series, the intelligent control module controls the first valve, the fifth valve, the sixth valve, and the fourth valve to be in the closed state, and controls the second valve and the third valve to be in the open state, so that the key variable frequency pump in the first biological tank series operates as a sludge conditioning pump to transport the activated sludge in the first biological tank series to the second biological tank series.

5. The multi-flow stabilization system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent stabilization module is equipped with a cross-flow mode; when both series of biological pools are in normal operation, the intelligent stabilization module adjusts the multi-functional valve group to achieve real-time complementarity of the internal flow between the first biological pool series and the second biological pool series.

6. The multi-flow stabilization system for internal and external reflux pump groups according to claim 1, characterized in that: It also includes a dual internal reflux subsystem, which has two independent reflux paths. Both reflux paths draw water from the micro-aerobic zone at the end of the biological aeration tank and perform degassing treatment before entering the anoxic zone to control the dissolved oxygen concentration in the reflux liquid to be below 0.5 mg / L. The recirculation point of the first internal recirculation path is located at the beginning of the anoxic section, and its recirculation volume accounts for 60% of the total internal recirculation volume; The recirculation point of the second internal recirculation path is located in the third zone in the middle and rear of the anoxic section, and its recirculation volume accounts for 40% of the total internal recirculation volume.

7. The multi-flow stabilization and control system for internal and external reflux pump groups according to claim 1, characterized in that: It also includes a dual external reflux subsystem, which draws water from the secondary sedimentation tank mud well and degasses it until the dissolved oxygen concentration is below 0.2 mg / L, then divides it into two reflux streams; The return point of the first external return path is located at the beginning of the anaerobic zone, and its return volume accounts for 30% of the total external return volume; The return point of the second external return path is located in the first hypoxic zone, and its return flow accounts for 70% of the total external return flow.

8. The multi-flow stabilization and control system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent stabilization module uses the oxidation-reduction potential and sludge concentration in the middle of the anaerobic section as control indicators to control the oxidation-reduction potential of the anaerobic section below -150 millivolts; the dual external reflux subsystem adopts a carbon source starvation and abundance alternation acclimatization module to activate denitrifying polysaccharide bacteria and denitrifying phosphorus removal bacteria to carry out endogenous denitrification using polyhydroxyalkanoates stored in the microorganisms.

9. The multi-flow stabilization and control system for internal and external reflux pump groups according to claim 1, characterized in that: The intelligent stabilization and control module dynamically adjusts the operating power of the key variable frequency pumps based on the real-time liquid level, flow rate parameters, and sludge concentration data of the first and second biological tank series using a variable frequency control algorithm.

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