Municipal sewage treatment system based on sludge activity regulation device optimization

Abstract

The application discloses a kind of municipal sewage treatment systems based on sludge activity regulation and control device optimization, belong to municipal sewage biological treatment technical field.The system includes biological treatment unit, sludge activity intelligent sorting device, sludge activity multistage conditioning tank unit, resource regeneration pond and intelligent central control platform.Biological treatment unit receives to be treated municipal sewage.Sludge activity intelligent sorting device carries out mud-water separation and activity classification to sludge mixture, and the high-activity sludge obtained enters sludge activity multistage conditioning tank unit, low-activity sludge enters resource regeneration pond, anaerobic fermentation is carried out in resource regeneration pond, and the sludge fermentation liquor produced is backflowed to sludge activity multistage conditioning tank unit by pipeline.Intelligent central control platform controls dynamic sludge pressure overflow ratio, sludge retention time, dissolved oxygen concentration, sludge fermentation liquor flow rate and other operating parameters by real-time monitoring, improves the denitrification efficiency of system and reduces operating energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of municipal wastewater biological treatment technology, specifically relating to a municipal wastewater treatment system optimized based on a sludge activity control device. Background Technology

[0002] Municipal wastewater treatment is a crucial component of modern urban infrastructure. Traditional wastewater treatment technologies primarily rely on biological treatment units to degrade and remove organic matter and nutrients from wastewater. However, traditional methods face several technical and economic challenges when confronted with complex water quality changes and increasingly stringent discharge standards. Municipal wastewater treatment technology has long been dominated by traditional activated sludge processes, which generally suffer from high energy consumption, large sludge production, and insufficient nitrogen removal efficiency. In recent years, to reduce carbon source consumption and energy consumption while improving nitrogen removal efficiency, short-cut nitrification-anaerobic ammonium oxidation technology has gradually gained attention and become a research hotspot. However, in practical engineering applications, this technology still faces challenges such as difficulty in precisely controlling sludge activity, insufficient system stability, and low sludge resource utilization, limiting its large-scale promotion and application. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of unstable efficiency, poor adaptability to load fluctuations, and high cost of residual sludge disposal in existing short-cut nitrification-anaerobic ammonium oxidation processes for municipal wastewater, and to provide a municipal wastewater treatment system optimized based on a sludge activity regulation device. This invention achieves multiple objectives—efficient nitrogen removal, sludge reduction, and resource recovery—by constructing a system that integrates intelligent sorting, high-activity enrichment, multi-stage conditioning, and anaerobic digestion.

[0004] The specific technical solution adopted in this invention is as follows:

[0005] This invention provides a short-cut nitrification-anaerobic ammonium oxidation municipal wastewater treatment system with sludge activity regulation, characterized in that it includes a biological treatment unit, a sludge active intelligent sorting device, a sludge active multi-stage conditioning tank unit, a resource regeneration tank, and an intelligent central control platform.

[0006] The biological treatment unit receives municipal wastewater through an inlet pipe, and its outlet is connected to an intelligent sludge active separation device through an outlet pipe. The intelligent sludge active separation device separates the sludge mixture from the biological treatment unit into sludge and water, and classifies its activity. The highly active sludge after activity classification enters the multi-stage sludge active conditioning tank unit through a highly active sludge sludge phase pipeline, while the less active sludge after activity classification enters the resource regeneration tank through a less active sludge sludge phase pipeline. Anaerobic fermentation takes place in the resource regeneration tank, and the resulting sludge fermentation liquid is returned to the multi-stage sludge active conditioning tank unit through a pipeline.

[0007] The intelligent central control platform is connected to the biological treatment unit, the sludge active intelligent sorting device, the sludge active multi-stage conditioning tank unit, and the resource regeneration tank, respectively. Through real-time monitoring, it dynamically adjusts the sludge inlet pressure and overflow ratio in the sludge active intelligent sorting device, the sludge residence time and dissolved oxygen concentration in the sludge active multi-stage conditioning tank unit, and the sludge fermentation liquid return flow rate in the resource regeneration tank.

[0008] Preferably, the sludge active intelligent sorting device includes a distribution box and several sets of hydrocyclones in series; each set of hydrocyclones in series consists of a first hydrocyclone for sludge-water separation and a second hydrocyclone for sludge activity classification connected in series; the inlet of the distribution box is connected to the effluent pipeline; the overflow end of the first hydrocyclone in each set of hydrocyclones flows to the aqueous phase pipeline through a pipeline; the overflow end of the second hydrocyclone in each set of hydrocyclones flows to the high-activity sludge phase pipeline through a pipeline, and the underflow end of the second hydrocyclone flows to the low-activity sludge phase pipeline through a pipeline.

[0009] Preferably, the first hydrocyclone has a first feed inlet and a first overflow outlet at its upper part; the second hydrocyclone has a second feed inlet and a second overflow outlet at its upper part, wherein the second feed inlet is connected to the underflow outlet provided at the bottom of the first hydrocyclone; and the bottom of the second hydrocyclone is provided with an underflow outlet.

[0010] Furthermore, the first feed inlet and the first hydrocyclone body are tangentially arranged, and the second feed inlet and the second hydrocyclone body are also tangentially arranged, so that the sludge mixture enters the hydrocyclone to form a stable rotating flow field.

[0011] Preferably, the bottom of the first hydrocyclone is also provided with a flushing port to prevent scale buildup; and an independent pressure and flow regulating device is provided in front of the first feed inlet of the first hydrocyclone in each group of series hydrocyclones.

[0012] Preferably, both the first and second hydrocyclones have a conical bottom structure that facilitates mud-water separation. The cone angle at the bottom of the first hydrocyclone is set to 20°–25°, and the cone angle at the bottom of the second hydrocyclone is set to 15°–20°. The mud inlet pressure of the first hydrocyclone is 0.15–0.20 MPa, and the overflow ratio is 10–25%. The mud inlet pressure of the second hydrocyclone is 0.20–0.25 MPa, and the overflow ratio is 5–15%.

[0013] Preferably, the sludge activated multi-stage conditioning tank unit includes a primary sludge activated conditioning tank, a secondary sludge activated conditioning tank, and a tertiary sludge activated conditioning tank connected in series. Each conditioning tank includes a tank body and a flow guide baffle installed within the tank body. The tank body has a sludge inlet, a sludge outlet, a sludge conditioning liquid inlet, and a sludge return outlet. The sludge inlet of the primary sludge activated conditioning tank is connected to the sludge activated intelligent sorting device through a high-activity sludge phase pipeline. The sludge inlets of the secondary and tertiary sludge activated conditioning tanks are respectively connected to the sludge outlets of the primary and secondary sludge activated conditioning tanks. The sludge conditioning liquid inlets of the three conditioning tanks are respectively connected to the resource regeneration tank through conditioning liquid return pipelines to receive sludge fermentation liquid from the resource regeneration tank. The sludge return outlets of the three conditioning tanks are respectively connected to the biological treatment unit through sludge return pipelines.

[0014] The total sludge retention time in the sludge activated multi-stage conditioning tank unit is 12-24 hours, and the dissolved oxygen in each conditioning tank is controlled below 0.2 mg / L.

[0015] Furthermore, the flow guide baffles are staggered on both sides of the inner cavity of the pool and spaced apart along the horizontal direction of the pool to prolong the contact time between sludge and water; the length-to-width ratio of the pool is set to (3~10):1, and the water depth is set to 1.5~5 m; the height of the flow guide baffles is set to 0.80~0.95 of the water depth in the pool, and a flow gap of 5~15% is left at the top or bottom to allow sludge to flow across sections of the pool.

[0016] Preferably, the top of the resource recycling tank is provided with a recycled product recovery pipeline for recovering by-products; the sludge fermentation liquid return flow rate at the sludge fermentation liquid outlet of the resource recycling tank is set to 20% to 40% of the volume of low-activity sludge entering the resource recycling tank.

[0017] Preferably, the intelligent central control platform includes a first automatic control cabinet and a second automatic control cabinet; the first automatic control cabinet is connected to the sludge activated intelligent sorting device; the second automatic control cabinet is connected to the sludge activated multi-stage conditioning tank unit and the resource regeneration tank; the monitoring frequency of the intelligent central control platform is once every 1 to 5 minutes.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The sludge activated intelligent sorting device provided by the present invention adopts several sets of parallel series hydrocyclones and precisely controls the sludge inlet pressure and overflow ratio to achieve efficient sludge-water separation and activated classification of sludge mixture. Unlike traditional two-stage sedimentation tanks, the present invention adopts independent sludge activated multi-stage conditioning tank units and resource regeneration tanks.

[0020] (2) The sludge activation multi-stage conditioning tank unit provided by the present invention receives highly active sludge after activation classification. Through several conditioning units connected in series and independent sludge return pipelines, the return strategy is intelligently adjusted according to the fluctuation of water quality and quantity of the influent, gradually enriching and strengthening the highly active sludge, optimizing its biodegradation capacity and stability, and improving the treatment effect.

[0021] (3) The resource regeneration tank provided by this invention receives low-activity sludge after activity classification, and performs anaerobic fermentation on the low-activity sludge to produce sludge fermentation broth containing active factors such as short-chain fatty acids, small-molecule organic acids and quorum sensing molecules, thereby realizing the resource utilization of sludge and reducing sludge discharge. The obtained sludge fermentation broth is returned to the multi-stage sludge activation conditioning tank as a conditioning liquid to soak and enhance the high-activity sludge, further improving its biological activity and treatment capacity, forming a virtuous cycle.

[0022] (4) The intelligent central control platform provided by the present invention monitors and dynamically adjusts key operating parameters in the system in real time, such as pressure, dissolved oxygen, oxidation-reduction potential, ammonia nitrogen, nitrite nitrogen, etc. Through high-frequency data acquisition and analysis, it optimizes the sewage treatment process, improves denitrification efficiency, reduces operating energy consumption and sludge production, and ensures stable and efficient operation of the system.

[0023] In summary, this invention effectively improves the nitrogen removal rate in wastewater, significantly reduces sludge production, achieves resource utilization, and lowers operating costs through innovative technologies such as precise active sludge sorting, multi-stage active conditioning, and resource recycling. It has significant environmental and economic benefits and is particularly suitable for large-scale application and promotion in the field of municipal wastewater treatment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall municipal wastewater treatment system provided in this embodiment;

[0025] Figure 2 This is a schematic diagram of the sludge activated intelligent sorting device provided in this embodiment;

[0026] Figure 3 This is a schematic diagram of the series hydrocyclone assembly provided in this embodiment;

[0027] Figure 4 This is a top view of a single conditioning tank in the sludge activation multi-stage conditioning tank unit provided in this embodiment;

[0028] In the diagram: 1. Inlet pipe; 2. Biological treatment unit; 2.1. Outlet pipe; 3. Intelligent sludge active separation device; 3.1. Aqueous phase pipe; 3.2. High-activity sludge phase pipe; 3.3. Low-activity sludge phase pipe; 3.4. Distribution box; 300. Series hydrocyclone group; 301. First hydrocyclone; 302. Second hydrocyclone; 303. First feed inlet; 304. First overflow outlet; 305. Second feed inlet; 307. Second overflow outlet; 308. Underflow outlet; 4. Multi-stage sludge active conditioning tank unit; 4.1. Primary sludge active conditioning tank; 4.2. Secondary sludge active conditioning tank; 3. 4.3 Primary sludge activation conditioning tank; 4.4.1 Primary sludge return pipeline; 4.4.2 Secondary sludge return pipeline; 4.4.3 Tertiary sludge return pipeline; 400 Tank body; 401 Sludge inlet; 402 Sludge outlet; 403 Sludge conditioning liquid inlet; 404 Sludge return outlet; 405 Baffle plate; 5 Resource regeneration tank; 5.1.1 First conditioning liquid return pipeline; 5.1.2 Second conditioning liquid return pipeline; 5.1.3 Third conditioning liquid return pipeline; 5.2 Recycled product recovery pipeline; 6 Intelligent central control platform; 6.1 First automatic control cabinet; 6.2 Second automatic control cabinet. Detailed Implementation

[0029] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0030] In the description of this invention, it should be understood that the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0031] like Figure 1 As shown, in a preferred embodiment of the present invention, this embodiment provides a municipal wastewater treatment system optimized based on a sludge activation regulation device. The municipal wastewater treatment system includes a biological treatment unit 2, a sludge activation intelligent sorting device 3, a sludge activation multi-stage conditioning tank unit 4, a resource regeneration tank 5, and an intelligent central control platform 6.

[0032] In the system provided by this invention, the inlet of the biological treatment unit 2 receives municipal wastewater to be treated through the inlet pipe 1, and the outlet of the biological treatment unit 2 is connected to the sludge activated intelligent sorting device 3 through the outlet pipe 2.1. The biological treatment unit 2 can adopt a modified SBR or a continuous flow short-cut nitrification-anaerobic ammonium oxidation reactor structure.

[0033] In the system provided by this invention, the sludge active intelligent sorting device 3 separates the sludge mixture from the biological treatment unit 2 into sludge and water and classifies its activity. Specifically, the sludge active intelligent sorting device 3 includes a distribution box 3.4 and several sets of hydrocyclones 300 connected in series. In this embodiment, three sets of hydrocyclones 300 are connected in parallel, as shown below. Figure 2 As shown.

[0034] like Figure 3 As shown, the series hydrocyclone assembly 300 provided in this embodiment consists of a first hydrocyclone 301 and a second hydrocyclone 302 connected in series. The first hydrocyclone 301 is mainly used for sludge-water separation, and the second hydrocyclone 302 is mainly used for sludge active classification. The first hydrocyclone 301 has a first inlet 303 and a first overflow 304 at its upper part. The second hydrocyclone 302 has a second inlet 306 and a second overflow 307 at its upper part. The bottom of the second hydrocyclone 302 is provided with an underflow outlet 308.

[0035] The inlet of the distribution box 3.4 in the sludge activated intelligent sorting device 3 is connected to the effluent pipe 2.1, receiving the sludge mixture from the biological treatment unit 2. The distribution box 3.4 has three outlets at its bottom, each connected to the first inlet 303 of one of the three first hydrocyclones 301 via pipes. The underflow outlets at the bottom of each of the three first hydrocyclones 301 are connected to the second inlet 306 of the corresponding second hydrocyclones 302. The first overflow outlets 304 of the three first hydrocyclones 301 are connected to the aqueous phase pipe 3.1 via pipes. The second overflow outlets 307 of the three second hydrocyclones 302 are connected to the highly activated sludge phase pipe 3.2 via pipes, and the underflow outlets 308 of the three second hydrocyclones 302 are connected to the low-activated sludge phase pipe 3.3 via pipes.

[0036] To improve the separation efficiency of the sludge mixture in the first hydrocyclone 301 and the second hydrocyclone 302, in this embodiment, the first inlet 303 and the main body of the first hydrocyclone 301 are tangentially arranged, as are the second inlet 306 and the main body of the second hydrocyclone 302. This causes a strong rotational motion to be generated inside the hydrocyclone when the sludge mixture enters it. The centrifugal force generated by this rotational motion can separate particles of different sizes and densities, thereby achieving effective sorting of the sludge mixture. It should be noted that the first inlet 303 and the main body of the first hydrocyclone 301, as well as the second inlet 306 and the main body of the second hydrocyclone 302, can also be connected in a near-tangential manner. Those skilled in the art can set the angle between them according to specific circumstances. The bottoms of both the first hydrocyclone 301 and the second hydrocyclone 302 are designed as conical structures to facilitate sludge-water separation, wherein the cone angle at the bottom of the first hydrocyclone 301 is set to 20° to 25°, and the cone angle at the bottom of the second hydrocyclone 302 is set to 15° to 20°. In this embodiment, the bottom cone angles of the first hydrocyclone 301 and the second hydrocyclone 302 are set to 22° and 18°, respectively.

[0037] In addition, to prevent scale buildup at the bottom of the first hydrocyclone 301, this embodiment also provides a flushing port 305 at the bottom of the first hydrocyclone 301. In actual use, the flushing pressure at the flushing port 305 is slightly higher than the sludge inlet pressure to quickly remove blockages.

[0038] After sludge-water separation and sludge activity classification by the first hydrocyclone 301 and the second hydrocyclone 302 in the sludge active intelligent sorting device 3, the sludge mixture is divided into an aqueous phase, highly active sludge, and low-activity sludge. The aqueous phase is discharged through the aqueous phase pipeline 3.1, the highly active sludge enters the sludge active multi-stage conditioning tank unit 4 through the highly active sludge sludge phase pipeline 3.2, and the low-activity sludge enters the resource regeneration tank 5 through the low-activity sludge sludge phase pipeline 3.3. It should be noted that the terms "high-activity sludge" and "low-activity sludge" in this invention are relative terms; the level of sludge activity can be distinguished based on its settling properties, particle size and density, and organic matter content.

[0039] The sludge activated multi-stage conditioning tank unit 4 provided in this embodiment includes a primary sludge activated conditioning tank 4.1, a secondary sludge activated conditioning tank 4.2, and a tertiary sludge activated conditioning tank 4.3 connected in series. For example... Figure 4As shown, each conditioning tank includes a tank body 400 and a flow guide baffle 405 installed within the tank body 400. The tank body 400 has a sludge inlet 401, a sludge outlet 402, a sludge conditioning liquid inlet 403, and a sludge return outlet 404. The sludge inlet 401 of the primary sludge activated conditioning tank 4.1 is connected to the sludge activated intelligent sorting device 3 via a high-activity sludge phase pipeline 3.2, receiving the high-activity sludge separated by the sludge activated intelligent sorting device 3. The sludge inlet 401 of the secondary sludge activated conditioning tank 4.2 is connected to the sludge outlet 402 of the primary sludge activated conditioning tank 4.1 via a pipeline, and the sludge inlet 401 of the tertiary sludge activated conditioning tank 4.3 is connected to the sludge outlet 402 of the secondary sludge activated conditioning tank 4.2 via a pipeline.

[0040] The sludge conditioning liquid inlets 403 of the three conditioning tanks are connected to the resource recycling tank 5 via conditioning liquid return pipelines to receive sludge fermentation liquid from the resource recycling tank 5. Specifically, the sludge fermentation liquid outlet of the resource recycling tank 5 is divided into three branches: the first conditioning liquid return pipeline 5.1.1, the second conditioning liquid return pipeline 5.1.2, and the third conditioning liquid return pipeline 5.1.3. The sludge conditioning liquid inlets 403 of the primary sludge activated conditioning tank 4.1, the secondary sludge activated conditioning tank 4.2, and the tertiary sludge activated conditioning tank 4.3 are connected to the first conditioning liquid return pipeline 5.1.1, the second conditioning liquid return pipeline 5.1.2, and the third conditioning liquid return pipeline 5.1.3, respectively. The sludge return outlets 404 of the primary sludge activated conditioning tank 4.1, the secondary sludge activated conditioning tank 4.2, and the tertiary sludge activated conditioning tank 4.3 are connected to the biological treatment unit 2 after converging through the primary sludge return pipeline 4.4.1, the secondary sludge return pipeline 4.4.2, and the tertiary sludge return pipeline 4.4.3, respectively.

[0041] The flow guide baffles 405 are staggered on both sides of the inner cavity of the tank body 400 and spaced apart along the horizontal direction of the tank body 400. This creates a continuous reciprocating flow channel between adjacent baffles, prolonging the contact time between sludge and water and reducing dead zones. If an inclined or conical groove is provided at the bottom of the tank body 400, the deposited inert particles or low-activity sludge can also be discharged to the resource regeneration tank 5 through the sludge discharge pipe, according to actual process requirements.

[0042] It should be noted that in this invention, the length-to-width ratio of the pool body 400 is set to 3~10:1, and the water depth is set to 1.5~5 m. The height of the flow guide baffle 405 is set to 0.80~0.95 of the water depth inside the pool body 400, and a flow gap of 5~15% is left at the top or bottom to allow sludge to flow across sections of the pool body 400.

[0043] In the system provided by this invention, the resource regeneration tank 5 is used for anaerobic fermentation or other resource recovery treatment of low-activity sludge, producing a sludge fermentation broth containing active factors such as short-chain fatty acids, small-molecule organic acids, and quorum sensing molecules. This sludge fermentation broth is returned to the sludge activation conditioning tank 4 as a sludge activation multi-stage conditioning tank for soaking and enhancing the high-activity sludge. The top of the resource regeneration tank 5 is equipped with a regeneration product recovery pipeline 5.2 for recovering by-products.

[0044] In the system provided by this invention, the intelligent central control platform 6 is connected to the biological treatment unit 2, the sludge activated intelligent sorting device 3, the sludge activated multi-stage conditioning tank unit 4, and the resource regeneration tank 5, respectively. The intelligent central control platform 6 dynamically regulates the influent pressure and overflow ratio in the sludge activated intelligent sorting device 3, the sludge retention time and dissolved oxygen concentration in the sludge activated multi-stage conditioning tank unit 4, and the sludge fermentation broth yield in the resource regeneration tank 5 by monitoring the effluent quality of the biological treatment unit 2 in real time.

[0045] In this embodiment, the intelligent central control platform 6 includes a first automatic control cabinet 6.1 and a second automatic control cabinet 6.2. The monitoring frequency of the intelligent central control platform 6 is once every 1 to 5 minutes. The first automatic control cabinet 6.1 is connected to the sludge activated intelligent sorting device 3. An independent pressure and flow regulation device is set before the first feed inlet 303 of the first hydrocyclone 301 in each set of series hydrocyclones 300. Based on the real-time monitoring data, the intelligent central control platform 6 regulates the sludge inlet pressure of the first hydrocyclone 301 in each set of series hydrocyclones 300 to 0.15 to 0.20 MPa and the overflow ratio to 10 to 25%, and regulates the sludge inlet pressure of the second hydrocyclone 302 to 0.20 to 0.25 MPa and the overflow ratio to 5 to 15%. The second automatic control cabinet 6.2 is connected to the sludge activation multi-stage conditioning tank unit 4 and the resource regeneration tank 5, regulating the total sludge retention time of the sludge activation multi-stage conditioning tank unit 4 to 12-24 hours, that is, the sludge retention time in each conditioning tank to 4-8 hours. The second automatic control cabinet 6.2 also regulates the dissolved oxygen in each conditioning tank to below 0.2 mg / L, and regulates the sludge fermentation broth flow rate in the sludge return pipeline of the resource regeneration tank 5 to 20%-40% of the volume of low-activity sludge entering the resource regeneration tank 5. Through real-time monitoring and flexible control of the intelligent sludge activation intelligent sorting device 3, the sludge activation multi-stage conditioning tank 4, and the resource regeneration tank 5 via the intelligent central control platform 6, the system adapts to fluctuations in water quality and quantity, improving and enhancing the stability and efficiency of the biological treatment unit 2. The intelligent central control platform 6 can also regulate the aeration rate, stirring intensity, and sludge age of the biological treatment unit 2 based on the influent load and effluent water quality.

[0046] The following provides an operational example of the municipal wastewater treatment system in this embodiment:

[0047] S1: Municipal sewage to be treated enters biological treatment unit 2 through inlet pipe 1.

[0048] S2: The sludge mixture in biological treatment unit 2 is periodically or continuously discharged to sludge activation intelligent sorting device 3, where highly active sludge and low-active sludge are separated in the hydrocyclone group. The highly active sludge enters the sludge activation multi-stage conditioning tank unit 4, and the low-active sludge enters the resource regeneration tank 5.

[0049] S3: In the sludge activated multi-stage conditioning tank unit 4, the highly active sludge undergoes stepwise selection and enrichment in the primary sludge activated conditioning tank 4.1, the secondary sludge activated conditioning tank 4.2, and the tertiary sludge activated conditioning tank 4.3, so that the dissolved oxygen is controlled below 0.2 mg / L or in a micro-aerobic state.

[0050] S4: In the resource recycling tank 5, the low-activity sludge undergoes anaerobic digestion to produce biogas or short-chain fatty acids, and the resulting sludge fermentation liquid is returned to the sludge activation multi-stage conditioning tank unit 4.

[0051] S5: The intelligent central control platform 6 collects key parameters of the biological treatment unit 2, the sludge active intelligent sorting device 3, the sludge active multi-stage conditioning tank unit 4, and the resource regeneration tank 5 at a monitoring frequency of 1 to 5 minutes, and adjusts the sludge inlet pressure, overflow ratio, stirring intensity, and sludge return ratio in real time to maintain good system operation and stable effluent compliance.

[0052] In summary, this invention effectively improves the nitrogen removal rate in wastewater, significantly reduces sludge production, achieves resource utilization, and lowers operating costs through innovative technologies such as precise active sludge sorting, multi-stage active conditioning, and resource recycling. It has significant environmental and economic benefits and is particularly suitable for large-scale application and promotion in the field of municipal wastewater treatment.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A municipal wastewater treatment system optimized based on a sludge activation regulation device, characterized in that, It includes a biological treatment unit (2), a sludge active intelligent sorting device (3), a sludge active multi-stage conditioning tank unit (4), a resource recycling tank (5), and an intelligent central control platform (6). The inlet of the biological treatment unit (2) receives municipal sewage to be treated through the inlet pipe (1), and the outlet of the biological treatment unit (2) is connected to the sludge active intelligent sorting device (3) through the outlet pipe (2.1). The sludge active intelligent sorting device (3) separates the sludge mixture from the biological treatment unit (2) into sludge and water and classifies its activity. The highly active sludge after activity classification enters the sludge active multi-stage conditioning tank unit (4) through the highly active sludge sludge phase pipe (3.2), and the low-activity sludge after activity classification enters the resource regeneration tank (5) through the low-activity sludge sludge phase pipe (3.3). Anaerobic fermentation is carried out in the resource regeneration tank (5), and the sludge fermentation liquid produced is returned to the sludge active multi-stage conditioning tank unit (4) through the pipe. The intelligent central control platform (6) is connected to the biological treatment unit (2), the sludge active intelligent sorting device (3), the sludge active multi-stage conditioning tank unit (4) and the resource regeneration tank (5) respectively. Through real-time monitoring, it dynamically controls the sludge inlet pressure and overflow ratio in the sludge active intelligent sorting device (3), the sludge residence time and dissolved oxygen concentration in the sludge active multi-stage conditioning tank unit (4) and the sludge fermentation liquid return flow rate in the resource regeneration tank (5). The sludge active intelligent sorting device (3) includes a distribution box (3.4) and several sets of hydrocyclone groups (300) in series; each set of hydrocyclone groups (300) consists of a first hydrocyclone (301) for sludge-water separation and a second hydrocyclone (302) for sludge activity classification in series; the inlet of the distribution box (3.4) is connected to the effluent pipeline (2.1); the overflow end of the first hydrocyclone (301) in each set of hydrocyclone groups (300) is connected to the aqueous phase pipeline (3.1) through a pipeline; the overflow end of the second hydrocyclone (302) in each set of hydrocyclone groups (300) is connected to the high-activity sludge phase pipeline (3.2) through a pipeline, and the underflow end of the second hydrocyclone (302) is connected to the low-activity sludge phase pipeline (3.3) through a pipeline. The sludge activated multi-stage conditioning tank unit (4) includes a first-stage sludge activated conditioning tank (4.1), a second-stage sludge activated conditioning tank (4.2), and a third-stage sludge activated conditioning tank (4.3) connected in series; each conditioning tank includes a tank body (400) and a flow guide baffle (405) installed inside the tank body (400); the tank body (400) is provided with a sludge inlet (401), a sludge outlet (402), a sludge conditioning liquid inlet (403), and a sludge return outlet (404).

2. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The first hydrocyclone (301) has a first feed inlet (303) and a first overflow outlet (304) at its upper part; the second hydrocyclone (302) has a second feed inlet (306) and a second overflow outlet (307) at its upper part, wherein the second feed inlet (306) is connected to the underflow outlet provided at the bottom of the first hydrocyclone (301); the second hydrocyclone (302) has an underflow outlet (308) at its bottom.

3. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 2, characterized in that, The first feed inlet (303) and the main body of the first hydrocyclone (301) are tangentially arranged, and the main bodies of the second feed inlet (306) and the second hydrocyclone (302) are also tangentially arranged, so that the sludge mixture enters the hydrocyclone to form a stable rotating flow field.

4. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The bottom of the first hydrocyclone (301) is also provided with a flushing port (305) to prevent deposits and scale buildup; an independent pressure and flow regulating device is provided in front of the first feed inlet (303) of the first hydrocyclone (301) in each series hydrocyclone group (300).

5. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The bottom of both the first hydrocyclone (301) and the second hydrocyclone (302) is a conical structure that facilitates mud-water separation. The cone angle at the bottom of the first hydrocyclone (301) is set to 20° to 25°, and the cone angle at the bottom of the second hydrocyclone (302) is set to 15° to 20°. The mud inlet pressure of the first hydrocyclone (301) is 0.15 to 0.20 MPa, and the overflow ratio is 10% to 25%. The mud inlet pressure of the second hydrocyclone (302) is 0.20 to 0.25 MPa, and the overflow ratio is 5% to 15%.

6. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The sludge inlet (401) of the primary sludge activated conditioning tank (4.1) is connected to the sludge activated intelligent sorting device (3) through the high-activity sludge phase pipeline (3.2); the sludge inlets (401) of the secondary sludge activated conditioning tank (4.2) and the tertiary sludge activated conditioning tank (4.3) are respectively connected to the sludge outlets (402) of the primary sludge activated conditioning tank (4.1) and the secondary sludge activated conditioning tank (4.2); the sludge conditioning liquid inlets (403) of the three conditioning tanks are respectively connected to the resource regeneration tank (5) through the conditioning liquid return pipeline to receive the sludge fermentation liquid from the resource regeneration tank (5); the sludge return outlets (404) of the three conditioning tanks are respectively connected to the biological treatment unit (2) through the sludge return pipeline. The total sludge retention time in the sludge activated multi-stage conditioning tank unit (4) is 12 to 24 hours, and the dissolved oxygen in each conditioning tank is controlled below 0.2 mg / L.

7. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 6, characterized in that, The flow guide baffles (405) are staggered on both sides of the inner cavity of the pool body (400) and spaced apart along the horizontal direction of the pool body (400) to prolong the contact time between sludge and water; the length-to-width ratio of the pool body (400) is set to (3~10):1, and the water depth is set to 1.5~5 m; the height of the flow guide baffles (405) is set to 0.80~0.95 of the water depth in the pool body (400), and a flow gap of 5~15% is left at the top or bottom so that the sludge can flow across sections of the pool body (400).

8. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The top of the resource recycling tank (5) is provided with a recycling pipeline (5.2) for recycling by-products; the sludge fermentation liquid return flow rate at the sludge fermentation liquid outlet of the resource recycling tank (5) is set to 20%~40% of the volume of low-activity sludge entering the resource recycling tank (5).

9. The municipal wastewater treatment system optimized based on a sludge activation regulation device according to claim 1, characterized in that, The intelligent central control platform (6) includes a first automatic control cabinet (6.1) and a second automatic control cabinet (6.2); the first automatic control cabinet (6.1) is connected to the sludge activated intelligent sorting device (3); the second automatic control cabinet (6.2) is connected to the sludge activated multi-stage conditioning tank unit (4) and the resource regeneration tank (5); the monitoring frequency of the intelligent central control platform (6) is once every 1 to 5 minutes.

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