Integrated energy-saving and water-saving water treatment system and treatment process

Abstract

The application provides an integrated energy-saving and water-saving water treatment system and treatment process, and relates to the field of water treatment, which comprises, in sequence along the water flow direction, a pre-oxygen pool, a mixing unit, a flocculation pool, a high-density sedimentation pool, a filter pool and a clean water pool, the mixing unit is used for mixing medicaments with raw water, and the filter pool is provided with a gas-water backwashing device. Through a hydraulic energy potential comprehensive utilization module, a hydraulic driving type micro-resistance mixer is used to realize efficient mixing of medicaments without external power, and an energy recovery device is used to recover the residual pressure of backwashing wastewater, which is directly used to drive a water pump or a dosing pump, so that the energy consumption is significantly reduced. Meanwhile, a wastewater near-zero discharge recycling module in the application recycles wastewater to a pretreatment or flocculation process through a backwashing wastewater recycling pool and a sludge concentrate recycling pipeline after treatment, so that the discharge is reduced and the water utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an integrated energy-saving and water-saving water treatment system and process. Background Technology

[0002] With the advancement of urban-rural integration and increasingly stringent environmental protection requirements, integrated water plants have been widely used in small and medium-sized water treatment scenarios due to their advantages such as small footprint, short construction period, and convenient management. However, the high energy and water consumption problems exposed by existing integrated water plants during long-term operation have become a bottleneck restricting their further promotion.

[0003] In terms of energy consumption, the power consumption of traditional integrated water plants is mainly concentrated in the reagent mixing and fluid transportation stages. First, conventional mechanical or pipeline static mixers rely on external electricity to drive the agitator or overcome huge head losses, resulting in continuous and considerable electricity consumption. Second, the backwashing process of the filter tank requires high-pressure water pumps and blowers to provide a large amount of energy, while the backwash wastewater rich in residual pressure is usually discharged directly, wasting this energy and failing to achieve effective recovery.

[0004] In terms of water consumption, water plants still have significant room for improvement in their own water production rate. Traditional water plants typically discharge the sludge supernatant from sedimentation tanks and the backwash wastewater from filters directly as production wastewater. This portion of water can account for 2%-5% of the total treated water volume, which is a huge waste for water-scarce areas. Although some technologies attempt to recirculate wastewater, they often lack effective pretreatment and precise intelligent control. This results in pollutants carried in the recirculated water impacting the upstream main processes, which in turn affects the effluent quality and may even increase the dosage of subsequent chemicals, creating a vicious cycle of increased consumption in the name of water conservation.

[0005] In summary, existing integrated water plants have prominent problems such as high energy consumption and high self-consumption rate during operation. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an integrated energy-saving and water-saving water treatment system and process, aiming to solve the problems of high energy consumption and high self-consumption rate of existing integrated water plants during operation. It provides a system and process that can significantly reduce operating power consumption and chemical consumption and improve water recovery rate while ensuring the quality of effluent.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: an integrated energy-saving and water-saving water treatment system and treatment process, comprising a pre-oxygenation tank, a mixing unit, a flocculation tank, a high-density sedimentation tank, a filtration tank and a clear water tank connected in sequence along the water flow direction, wherein the mixing unit is used to mix the reagent with the raw water, the filtration tank is equipped with an air-water backwashing device, and one end of the pre-oxygenation tank 1 is connected to a main water inlet pipe 9;

[0008] The treatment system also includes a hydraulic energy potential comprehensive utilization module, a wastewater near-zero discharge and reuse module, and an intelligent control module;

[0009] The hydraulic potential utilization module includes a hydraulically driven micro-resistance mixer installed in the mixing unit. The hydraulically driven micro-resistance mixer has a built-in turbine assembly that is driven to rotate by the inlet water flow. The turbine assembly is linked with the mixing swirl vane to achieve efficient mixing of the reagent and water without the need for external power.

[0010] The backwash wastewater pipeline of the filter tank is equipped with an energy recovery device to recover the residual pressure energy in the backwash wastewater.

[0011] The near-zero wastewater discharge and reuse module includes a backwash wastewater reuse tank. The inlet of the backwash wastewater reuse tank is connected to the backwash wastewater discharge outlet of the filter tank, and its outlet is connected to the inlet of the pre-oxygenation tank or the inlet of the hydraulically driven micro-resistance mixer via a return pipeline.

[0012] The sludge discharge port of the high-density sedimentation tank is connected to the water inlet of the flocculation tank and is equipped with a sludge concentrate recycling pipeline. The sludge concentrate recycling pipeline is used to return the supernatant after sludge concentration in the sedimentation tank to the flocculation process.

[0013] The intelligent control module includes a central controller, which is connected to a flow sensor, a pressure sensor, and a water quality monitoring instrument. Based on the system's inlet water pressure and flow rate, the central controller dynamically adjusts the operating status of the hydraulically driven micro-resistance mixer.

[0014] Based on the influent water quality and system load, the timing and flow rate of the backwash wastewater reuse tank and the sludge concentrate reuse pipeline are intelligently controlled.

[0015] Preferably, the turbine assembly includes a fixed turbine, one end of which extends and is coaxially connected to the mixing swirl vane; the turbine blades have an airfoil cross-section, used to efficiently convert the kinetic energy of the water flow into rotational mechanical energy under the impact of the incoming water flow; the turbine shaft and the mixing swirl vane are connected by a gearbox, which is used to adjust the rotational speed of the mixing swirl vane to adapt to different incoming water flow rates and mixing intensity requirements.

[0016] Preferably, the energy recovery device is a pressure exchanger, which is connected to the dosing pump of the hydraulically driven micro-resistance mixer, so that the recovered pressure energy can be directly used to drive the water pump or the dosing pump.

[0017] Preferably, the backwash wastewater reuse tank is equipped with an inclined plate sedimentation zone for solid-liquid separation of the collected backwash wastewater;

[0018] The treated supernatant is returned to the pre-oxygenation tank through the return pipeline.

[0019] Preferably, a sludge thickening device is connected in series on the sludge concentrate reuse pipeline, and the sludge thickening device is a gravity thickening tank;

[0020] The sludge thickening device is used to thicken the sludge discharged from the high-density sedimentation tank, and its overflow liquid is returned to the flocculation tank as the supernatant.

[0021] Preferably, the sludge concentrate reuse pipeline is equipped with a regulating valve and a suspended solids concentration meter;

[0022] The central controller of the intelligent control module is connected to the suspended solids concentration meter and the regulating valve. Based on the data monitored in real time by the suspended solids concentration meter, the opening of the regulating valve is dynamically adjusted to control the concentration of suspended solids in the supernatant to be maintained within a preset target range.

[0023] Preferably, the central controller of the intelligent control module predicts the pressure fluctuation cycle of the water supply network based on the pressure and time information of the main water inlet pipe monitored by the pressure sensor.

[0024] During periods when the pressure is higher than a preset high threshold, the power of the clean water export pump after the filter tank is reduced or stopped, and the water supply is preferentially supplied using the pipeline pressure to achieve peak-shifting and energy saving.

[0025] Preferably, the central controller of the intelligent control module dynamically controls the rotation speed of the mixing vortex vanes by adjusting the gearbox of the hydraulically driven micro-resistance mixer based on the inlet water flow monitored by the flow sensor, so that the mixing intensity matches the inlet water flow.

[0026] Preferably, the central controller of the intelligent control module establishes a predictive model based on influent turbidity and water temperature to estimate the system's flocculation effect and sludge yield.

[0027] Based on the estimated results, the optimal return flow rate of the sludge concentrate reuse pipeline and the trigger reuse turbidity threshold of the backwash wastewater reuse tank are dynamically calculated and set.

[0028] The integrated energy-saving and water-saving water treatment system includes the following steps:

[0029] S1. Pre-oxidation and energy recovery: Raw water enters the pre-oxidation tank for pre-oxidation treatment. At the same time, the backwash wastewater generated by the filter tank is introduced into the energy recovery device to recover its residual pressure energy.

[0030] S2, Hydraulic Driven Mixing: Pre-oxidized water or raw water drives the turbine assembly in the hydraulically driven micro-resistance mixer to rotate through the inlet water pressure, which in turn drives the mixing swirl vanes to rotate, achieving full mixing of the reagent and water without the need for external power.

[0031] S3. Flocculation and sludge reuse: The mixed water enters the flocculation tank for flocculation reaction. At the same time, the sludge discharged from the high-density sedimentation tank is concentrated, and the supernatant produced by concentration is returned to the inlet of the flocculation tank to enhance the flocculation effect.

[0032] S4. Sedimentation and Filtration: The flocculated water undergoes solid-liquid separation in a high-density sedimentation tank, and the supernatant enters a filtration tank for filtration.

[0033] S5. Wastewater reuse and intelligent control: The backwash wastewater after energy recovery in S1 is collected in the backwash wastewater reuse tank for sedimentation, and its supernatant is returned to the pre-oxygenation tank or the inlet of the hydraulically driven micro-resistance mixer.

[0034] The system's inlet pressure, flow rate, and water quality parameters are monitored in real time by a central controller, and at least one of the following controls is executed:

[0035] S5.1. Based on the inlet water pressure and flow rate, dynamically adjust the operating status of the hydraulically driven micro-resistance mixer;

[0036] S5.2 Based on the influent water quality and system load, intelligently control the timing and flow rate of sludge supernatant and backwash wastewater return;

[0037] S5.3 Based on inlet water pressure prediction, realize peak-shifting and energy-saving operation of clean water export pumps.

[0038] This invention provides an integrated energy-saving and water-saving water treatment system and process. It offers the following advantages: The invention utilizes a hydraulic energy potential comprehensive utilization module and a hydraulically driven micro-resistance mixer to achieve efficient reagent mixing without external power. An energy recovery device recovers residual pressure from backwash wastewater, which is directly used to drive water pumps or dosing pumps, significantly reducing energy consumption. A near-zero wastewater discharge and reuse module, through a backwash wastewater reuse tank and sludge concentrate reuse pipeline, treats wastewater and reuses it in pretreatment or flocculation processes, reducing emissions and improving water utilization. An intelligent control module dynamically adjusts the mixer's operating status, reuse timing, and return flow rate based on real-time monitoring of flow, pressure, and water quality parameters. It also predicts pressure fluctuations to achieve peak-shifting energy saving, ensuring efficient and stable system operation. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall process and module integration of the integrated energy-saving and water-saving water treatment system of the present invention.

[0040] Figure 2 This is a schematic diagram of the internal structure of the hydraulically driven micro-resistance mixer in this invention.

[0041] Figure 3 This is a schematic diagram of the process flow of the hydraulically driven micro-resistance mixer in this invention.

[0042] Figure 4 This is a schematic diagram illustrating the connection and process of the energy recovery device and the dosing pump in this invention.

[0043] Figure 5 This is a schematic diagram of the process and module integration of the near-zero wastewater discharge and reuse module in this invention.

[0044] Figure 6 This is a system control principle block diagram of the intelligent control module of the present invention.

[0045] In the diagram: 1. Pre-oxygenation tank; 2. Flocculation tank; 3. High-density sedimentation tank; 4. Filtration tank; 5. Clear water tank; 6. Hydraulically driven micro-resistance mixer; 9. Main inlet pipe; 14. Energy recovery device; 15. Backwash wastewater reuse tank; 16. Sludge concentrate reuse pipeline; 17. Mixing unit; 18. Turbine assembly; 19. Sludge thickening device; 20. Mixing swirl vane; 101. Hydraulic energy potential comprehensive utilization module; 102. Wastewater near-zero discharge reuse module; 103. Intelligent control module. Detailed Implementation

[0046] This invention provides an integrated energy-saving and water-saving water treatment system and process, such as... Figure 1-6 As shown, the system includes a pre-oxygenation tank 1, a mixing unit 17, a flocculation tank 2, a high-density sedimentation tank 3, a filtration tank 4, and a clear water tank 5 connected sequentially along the water flow direction. The mixing unit 17 is used to mix the reagent with the raw water. The filtration tank 4 is equipped with an air-water backwashing device. One end of the pre-oxygenation tank 1 is connected to the main water inlet pipe 9. The treatment system also includes a hydraulic energy potential comprehensive utilization module 101, a wastewater near-zero discharge and reuse module 102, and a smart control module 103.

[0047] The hydraulic energy potential comprehensive utilization module 101 includes a hydraulically driven micro-resistance mixer 6 disposed in the mixing unit 17. The hydraulically driven micro-resistance mixer 6 has a built-in turbine assembly 18 that is driven to rotate by the inlet water flow. The turbine assembly 18 is linked with the mixing swirl vane 20 to achieve efficient mixing of the agent and water without the need for external power.

[0048] The backwash wastewater pipeline of the filter tank 4 is equipped with an energy recovery device 14, which is used to recover the residual pressure energy in the backwash wastewater.

[0049] The near-zero wastewater discharge reuse module 102 includes a backwash wastewater reuse tank 15. The inlet of the backwash wastewater reuse tank 15 is connected to the backwash wastewater discharge port of the filter tank 4, and its outlet is connected to the inlet of the pre-oxygenation tank 1 through a return pipeline, or connected to the inlet of the hydraulically driven micro-resistance mixer 6.

[0050] The sludge discharge port of the high-density sedimentation tank 3 is connected to the water inlet of the flocculation tank 2 and is equipped with a sludge concentrate reuse pipeline 16. The sludge concentrate reuse pipeline 16 is used to return the supernatant after sludge concentration in the sedimentation tank to the flocculation process.

[0051] The intelligent control module 103 includes a central controller, which is connected to a flow sensor, a pressure sensor and a water quality monitoring instrument. Based on the system's inlet water pressure and flow rate, the central controller dynamically adjusts the operating status of the hydraulically driven micro-resistance mixer 6.

[0052] Based on the influent water quality and system load, the timing and flow rate of the backwash wastewater reuse tank 15 and the sludge concentrate reuse pipeline 16 are intelligently controlled.

[0053] Furthermore, the turbine assembly 18 includes a fixed turbine, one end of which extends and is coaxially connected to the mixing swirl vane 20; the turbine blades have an airfoil cross-section, which is used to efficiently convert the kinetic energy of the water flow into rotational mechanical energy under the impact of the incoming water flow; the turbine shaft and the mixing swirl vane 20 are connected by a gearbox, which is used to adjust the rotational speed of the mixing swirl vane 20 to adapt to different incoming water flow rates and mixing intensity requirements.

[0054] Furthermore, the energy recovery device 14 is a pressure exchanger, which is connected to the dosing pump of the hydraulically driven micro-resistance mixer 6, and the recovered pressure energy is directly used to drive the water pump or the dosing pump.

[0055] Furthermore, the backwash wastewater reuse tank 15 is equipped with an inclined plate sedimentation zone for solid-liquid separation of the collected backwash wastewater.

[0056] The treated supernatant is returned to the pre-oxygenation tank 1 through the return pipeline.

[0057] Furthermore, a sludge thickening device 19 is connected in series on the sludge concentrate reuse pipeline 16, and the sludge thickening device 19 is a gravity thickening tank.

[0058] The sludge thickening device 19 is used to thicken the sludge discharged from the high-density sedimentation tank 3, and its overflow liquid is returned to the flocculation tank 2 as the supernatant.

[0059] Furthermore, the sludge concentrate reuse pipeline 16 is equipped with a regulating valve and a suspended solids concentration meter;

[0060] The central controller of the intelligent control module 103 is connected to the suspended solids concentration meter and the regulating valve. Based on the data monitored in real time by the suspended solids concentration meter, the opening of the regulating valve is dynamically adjusted to control the suspended solids concentration in the supernatant to be maintained within a preset target range.

[0061] Furthermore, the central controller of the intelligent control module 103 predicts the pressure fluctuation cycle of the water supply network based on the pressure and time information of the main water inlet pipe 9 monitored by the pressure sensor.

[0062] During periods when the pressure is higher than a preset high threshold, the power of the clean water export pump after the filter tank 4 is reduced or stopped, and the water supply is supplied with priority by utilizing the pipeline pressure, thereby achieving peak-shifting and energy saving.

[0063] Furthermore, the central controller of the intelligent control module 103, based on the inlet water flow monitored by the flow sensor, dynamically controls the rotation speed of the mixing vortex vane 20 by adjusting the gearbox of the hydraulically driven micro-resistance mixer 6, so that the mixing intensity matches the inlet water flow.

[0064] Furthermore, the central controller of the intelligent control module 103 establishes a predictive model based on influent turbidity and water temperature to estimate the system's flocculation effect and sludge yield.

[0065] Based on the estimated results, the optimal return flow rate of the sludge concentrate reuse pipeline 16 and the trigger reuse turbidity threshold of the backwash wastewater reuse tank 15 are dynamically calculated and set.

[0066] The integrated energy-saving and water-saving water treatment system includes the following steps:

[0067] S1. Pre-oxidation and energy recovery: Raw water enters the pre-oxidation tank 1 for pre-oxidation treatment. At the same time, the backwash wastewater generated by the filter tank 4 is introduced into the energy recovery device 14 to recover its residual pressure energy.

[0068] S2, Hydraulic-driven mixing: Pre-oxidized water or raw water drives the turbine assembly 18 in the hydraulic-driven micro-resistance mixer 6 to rotate through the inlet water pressure, thereby driving the mixing vortex vane 20 to rotate, so as to achieve full mixing of the reagent and water without the need for external power.

[0069] S3. Flocculation and sludge reuse: The mixed water enters the flocculation tank 2 for flocculation reaction. At the same time, the sludge discharged from the high-density sedimentation tank 3 is concentrated, and the supernatant produced by concentration is returned to the inlet of the flocculation tank 2 to enhance the flocculation effect.

[0070] S4. Sedimentation and Filtration: The flocculated water undergoes solid-liquid separation in the high-density sedimentation tank 3, and the supernatant enters the filtration tank 4 for filtration.

[0071] S5. Wastewater reuse and intelligent control: The backwash wastewater after energy recovery in S1 is collected in the backwash wastewater reuse tank 15 for sedimentation, and its supernatant is returned to the inlet of the pre-oxygenation tank 1 or the hydraulically driven micro-resistance mixer 6.

[0072] The system's inlet pressure, flow rate, and water quality parameters are monitored in real time by a central controller, and at least one of the following controls is executed:

[0073] S5.1. Based on the inlet water pressure and flow rate, dynamically adjust the operating status of the hydraulically driven micro-resistance mixer 6;

[0074] S5.2 Based on the influent water quality and system load, intelligently control the timing and flow rate of sludge supernatant and backwash wastewater return;

[0075] S5.3 Based on inlet water pressure prediction, realize peak-shifting and energy-saving operation of clean water export pumps.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated energy-saving and water-saving water treatment system, comprising a pre-oxygenation tank (1), a mixing unit (17), a flocculation tank (2), a high-density sedimentation tank (3), a filtration tank (4), and a clear water tank (5) connected sequentially along the water flow direction, wherein the mixing unit (17) is used to mix the reagent with the raw water, the filtration tank (4) is equipped with an air-water backwashing device, and one end of the pre-oxygenation tank (1) is connected to an inlet main pipe (9), characterized in that: It also includes a hydraulic energy potential comprehensive utilization module (101), a wastewater near-zero discharge and reuse module (102), and a smart control module (103). The hydraulic energy potential comprehensive utilization module (101) includes a hydraulically driven micro-resistance mixer (6) disposed in the mixing unit (17). The hydraulically driven micro-resistance mixer (6) has a turbine assembly (18) that is driven to rotate by the inlet water flow. The turbine assembly (18) is linked with the mixing swirl vane (20). The backwash wastewater pipeline of the filter tank (4) is connected to an energy recovery device (14). The near-zero wastewater discharge reuse module (102) includes a backwash wastewater reuse tank (15). The inlet of the backwash wastewater reuse tank (15) is connected to the backwash wastewater discharge port of the filter tank (4), and its outlet is connected to the inlet of the pre-oxygenation tank (1) or the inlet of the hydraulically driven micro-resistance mixer (6) through a return pipeline. The sludge discharge port of the high-density sedimentation tank (3) is connected to the water inlet of the flocculation tank (2) and is provided with a sludge concentrate recycling pipeline (16). The sludge concentrate recycling pipeline (16) is used to return the supernatant after sludge concentration in the sedimentation tank to the flocculation process. The intelligent control module (103) includes a central controller, which is connected to the flow sensor, pressure sensor and water quality monitoring instrument. The energy recovery device (14) is a pressure exchanger, which is connected to the dosing pump of the hydraulically driven micro-resistance mixer (6). The central controller of the intelligent control module (103) establishes a prediction model based on influent turbidity and water temperature to estimate the system flocculation effect and sludge yield. Based on the estimated results, the optimal return flow rate of the sludge concentrate reuse pipeline (16) and the trigger reuse turbidity threshold of the backwash wastewater reuse tank (15) are dynamically calculated and set.

2. The integrated energy-saving and water-saving water treatment system according to claim 1, characterized in that: The turbine assembly (18) includes a fixed turbine, one end of which extends and is coaxially connected to the mixing vortex vane (20), and the turbine shaft and the mixing vortex vane (20) are connected by a gearbox.

3. The integrated energy-saving and water-saving water treatment system according to claim 1, characterized in that: The backwash wastewater reuse tank (15) is equipped with an inclined plate sedimentation zone; The treated supernatant is returned to the pre-oxygenation tank (1) through a return pipeline.

4. The integrated energy-saving and water-saving water treatment system according to claim 1, characterized in that: The sludge concentrate reuse pipeline (16) is connected in series with a sludge thickening device (19). The sludge thickening device (19) is used to thicken the sludge discharged from the high-density sedimentation tank (3), and its overflow liquid is returned to the flocculation tank (2) as the supernatant.

5. The integrated energy-saving and water-saving water treatment system according to claim 1, characterized in that: The sludge concentrate reuse pipeline (16) is equipped with a regulating valve and a suspended solids concentration meter; The central controller of the intelligent control module (103) is connected to the suspended solids concentration meter and the regulating valve.

6. The integrated energy-saving and water-saving water treatment system according to claim 5, characterized in that: The central controller of the intelligent control module (103) predicts the pressure fluctuation cycle of the water supply network based on the pressure and time information of the main water inlet pipe (9) monitored by the pressure sensor. During periods when the pressure is higher than the preset high threshold, the power of the clean water export pump after the filter tank (4) is reduced or stopped, and the water supply is supplied with priority by using the pipeline pressure to achieve peak-shifting energy saving.

7. The integrated energy-saving and water-saving water treatment system according to claim 1, characterized in that: The central controller of the intelligent control module (103) dynamically controls the rotation speed of the mixing vortex vane (20) by adjusting the gearbox of the hydraulically driven micro-resistance mixer (6) based on the inlet water flow monitored by the flow sensor, so that the mixing intensity matches the inlet water flow.

8. A treatment process based on an integrated energy-saving and water-saving water treatment system according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Pre-oxidation and energy recovery: Raw water enters the pre-oxidation tank (1) for pre-oxidation treatment. At the same time, the backwash wastewater generated by the filter tank (4) is introduced into the energy recovery device (14) to recover its residual pressure energy. S2, Hydraulic Driven Mixing: Pre-oxidized water or raw water drives the turbine assembly (18) in the hydraulically driven micro-resistance mixer (6) to rotate through the inlet water pressure, thereby driving the mixing vortex vane (20) to rotate, so as to achieve full mixing of the reagent and water without the need for external power. S3. Flocculation and sludge reuse: The mixed water enters the flocculation tank (2) for flocculation reaction. At the same time, the sludge discharged from the high-density sedimentation tank (3) is concentrated, and the supernatant produced by concentration is returned to the inlet of the flocculation tank (2) to enhance the flocculation effect. S4. Sedimentation and filtration: The flocculated water undergoes solid-liquid separation in a high-density sedimentation tank (3), and the supernatant enters a filtration tank (4) for filtration. S5. Wastewater reuse and intelligent control: The backwash wastewater after energy recovery in S1 is collected to the backwash wastewater reuse tank (15) for sedimentation, and its supernatant is returned to the inlet of the pre-oxygenation tank (1) or the hydraulically driven micro-resistance mixer (6). The system's inlet pressure, flow rate, and water quality parameters are monitored in real time by a central controller, and at least one of the following controls is executed: S5.

1. Based on the inlet water pressure and flow rate, dynamically adjust the operating status of the hydraulically driven micro-resistance mixer (6); S5.2 Based on the influent water quality and system load, intelligently control the timing and flow rate of sludge supernatant and backwash wastewater return; S5.3 Based on inlet water pressure prediction, realize peak-shifting and energy-saving operation of clean water export pumps.

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