Vacuum suction type rotary disc sludge filter

Abstract

The application discloses a vacuum suction type rotary disc sludge filter and relates to the technical field of sewage treatment equipment. The vacuum suction type rotary disc sludge filter comprises a box assembly, the inner cavity of the box assembly is divided into a concentration cavity and a gas-liquid separation cavity, the concentration cavity is provided with a total water inlet pipe and a concentrated liquid water outlet pipe, the gas-liquid separation cavity is provided with a clean water outlet pipe which is higher than a biochemical pool, a rotary disc filter system comprises a driving motor and a rotating central shaft pipe, the driving motor is used for driving the central shaft pipe to rotate, a plurality of rotary disc units which are in communication with the inner cavity of the central shaft pipe are fixed on the central shaft pipe, and filter cloth is wrapped on the rotary disc units, one end of the central shaft pipe is open and in communication with the gas-liquid separation cavity, a backwashing system comprises a backwashing pipeline which is provided with a plurality of cleaning nozzles, the cleaning nozzles are arranged towards the filter cloth, and a vacuum suction system comprises a suction unit which is in communication with the gas-liquid separation cavity and is used for forming a negative pressure difference on both sides of the filter cloth. The vacuum suction type rotary disc sludge filter can realize continuous filtration, non-stop backwashing, improve the filtration flux and the overall treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a vacuum suction rotary sludge filter. Background Technology

[0002] Municipal wastewater treatment plants typically equip their aerobic biological treatment tanks with secondary sedimentation tanks to achieve sludge interception and sludge-water separation. However, traditional secondary sedimentation tanks have several inherent technical defects: First, the equipment occupies a large area, resulting in high land investment costs for new wastewater treatment plants and limited space during the expansion and renovation of old wastewater treatment plants, making the addition of sedimentation tanks extremely difficult. Second, sludge-water separation relies on gravity static settling, which significantly affects separation efficiency due to influent water quality and hydraulic fluctuations, leading to poor effluent water quality stability and easy sludge accumulation and compaction at the bottom of the tank. Regular shutdowns for dredging are necessary, making continuous uninterrupted water treatment impossible. Third, concentrated sludge in the tank requires a dedicated sludge return pump to transport it to the front end of the biological treatment tank. The return pump experiences high energy consumption and severe mechanical wear during long-term continuous operation, resulting in a high equipment failure rate and high overall operation and maintenance costs.

[0003] Conventional rotary disc filter equipment only uses atmospheric pressure gravity filtration mode, which has weak filtration driving force, low filtration flux, and limited treatment capacity. At the same time, after the filter cloth surface is blocked by sludge, it can only be shut down and backwashed offline, which directly interrupts the continuous water treatment process, resulting in low overall treatment efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum suction rotary sludge filter to solve the problems existing in the prior art, and to achieve continuous filtration, non-stop backwashing, improved filtration throughput and overall treatment efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a vacuum suction rotary disc sludge filter, comprising: a housing assembly, the inner cavity of which is divided into a mutually enclosed thickening chamber and a gas-liquid separation chamber; the thickening chamber is provided with a main water inlet pipe and a concentrated liquid outlet pipe; the gas-liquid separation chamber is provided with a clear water outlet pipe higher than that of the biological treatment tank; a rotary disc filtration system, comprising a drive motor and a central shaft tube rotatably mounted in the thickening chamber, the drive motor driving the central shaft tube to rotate; multiple rotary disc units are fixed on the central shaft tube, the inner cavity of each rotary disc unit is connected to the inner cavity of the central shaft tube, and the rotary disc unit is covered with a filter cloth; one end of the central shaft tube is connected to the gas-liquid separation chamber; a backwashing system, comprising a backwashing pipeline arranged in the thickening chamber, the backwashing pipeline being provided with multiple cleaning nozzles, the cleaning nozzles being arranged facing the filter cloth; and a vacuum suction system, comprising a suction unit, the suction port of which is connected to the gas-liquid separation chamber, and is used to create a negative pressure difference on both sides of the filter cloth.

[0006] Preferably, the main water inlet pipe is located at the bottom of the concentration chamber, and the concentrate outlet pipe is higher than the main water inlet pipe; the main water inlet pipe has a plurality of water distribution holes evenly opened on its wall, and the incoming water flows through each of the water distribution holes and is evenly diffused into the interior of the concentration chamber, disturbing the water in the concentration chamber.

[0007] Preferably, the turntable unit includes multiple fan-shaped frames arranged circumferentially around the central shaft tube axis; the filter cloth is a plurality of fiber filter cloths, each corresponding to one of the fan-shaped frames, and the fiber filter cloths are wrapped around the fan-shaped frames; the inner cavity of the fan-shaped frames is connected to the central shaft tube.

[0008] Preferably, one end of the backwash pipeline is connected to a cleaning water source, and the backwash pipeline is connected in sections to each of the cleaning nozzles via unions. The cleaning nozzles are used to spray cleaning water onto the rotating filter cloth.

[0009] Preferably, the housing assembly is an integrally welded component.

[0010] Preferably, the inlet of the clean water outlet pipe is located at the bottom of the gas-liquid separation chamber, and the outlet of the clean water outlet pipe is connected to a water sealing tank; the outlet of the clean water outlet pipe is located below the liquid level in the water sealing tank.

[0011] Preferably, the water sealing tank is provided with a secondary water outlet pipe, the secondary water outlet pipe is L-shaped, the inlet of the secondary water outlet pipe is higher than the outlet of the clean water outlet pipe, and the outlet of the secondary water outlet pipe faces downward.

[0012] Preferably, the suction unit includes a vacuum pump and a vacuum suction pipeline, the inlet of the vacuum suction pipeline is connected to the suction port of the vacuum pump, and the outlet of the vacuum suction pipeline is connected to the gas-liquid separation chamber; the vacuum pump maintains the negative pressure value of the gas-liquid separation chamber at -0.03MPa to -0.05MPa.

[0013] Preferably, the incoming water flows through each of the water distribution holes to form a swirling flow that disturbs the water in the concentration chamber.

[0014] Preferably, the gas-liquid separation chamber is provided with a maintenance hole at its top, and a sealing cover is provided at the maintenance hole.

[0015] The present invention achieves the following technical effects compared to the prior art: The vacuum suction rotary sludge filter provided by this invention integrates the thickening chamber and the gas-liquid separation chamber into a single sealed inner cavity through a housing assembly, significantly reducing the overall space occupied by the equipment. The thickening chamber continuously feeds the water to be treated through the main inlet pipe to form a stable liquid level. The high-concentration sludge mixture enriched in the chamber is discharged by gravity through the thickener outlet pipe based on the liquid level difference, eliminating the need for an additional transfer pump, thus reducing power consumption and equipment maintenance workload. The gas-liquid separation chamber, equipped with a clear water outlet pipe higher than the biological treatment tank, can smoothly output filtered clear water. The drive motor drives the central shaft tube and the rotary disc unit to rotate continuously. The filter cloth covering the outside of the rotary disc unit forms a dynamic circulating filtration interface to continuously trap sludge. The inner cavity of the rotary disc unit is connected to the central shaft. The pipes and central shaft pipes connect to the gas-liquid separation chamber to form a closed flow channel. Dynamic filtration of water avoids static sludge accumulation and ensures the continuous and stable water treatment process unaffected by fluctuations in water quality and flow. The backwashing pipeline arranged in the concentration chamber, along with the cleaning nozzles facing the filter cloth, can flush the surface of the filter cloth in real time during the rotation of the rotary unit to trap sludge. Filtration and filter cloth cleaning are carried out simultaneously without interrupting the water treatment process. The suction unit continuously extracts air from the gas-liquid separation chamber, creating a negative pressure difference on both sides of the filter cloth. This enhances the driving force for water to penetrate the filter cloth and effectively increases the water treatment throughput per unit area of ​​the filter cloth. The whole machine simultaneously achieves multiple beneficial effects, including a smaller footprint, unpowered sludge transport, continuous and uninterrupted filtration, and high filtration capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of the vacuum suction rotary sludge filter provided by the present invention; Figure 2 A top view of the vacuum suction rotary sludge filter provided by the present invention; Figure 3 This is a schematic diagram of the backwashing pipeline in the vacuum suction rotary sludge filter provided by the present invention.

[0018] In the diagram: 1-Box assembly; 2-Concentrate outlet pipe; 3-Drive motor; 4-Shaft head; 5-Main water inlet pipe; 6-Support leg; 7-Secondary water outlet pipe; 8-Sealing tank; 9-Clean water outlet pipe; 10-Backwashing pipeline; 11-Water ring vacuum pump; 12-Vacuum suction pipeline; 13-Fiber filter cloth; 14-Rotating unit; 15-Central shaft tube; 16-Maintenance hole; 17-Cleaning nozzle; 18-Gas-liquid separation chamber; 19-Concentration chamber; 21-The joint of Ren. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a vacuum suction rotary sludge filter to solve the problems existing in the prior art, which can achieve continuous filtration, non-stop backwashing, and improve filtration throughput and overall treatment efficiency.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a vacuum suction rotary sludge filter, such as... Figures 1-3 As shown, it is particularly suitable for, but not limited to, new construction of wastewater treatment plants and technical upgrades and expansion projects of existing plants, including: The tank assembly 1 has an internal cavity divided into a closed concentration chamber 19 and a gas-liquid separation chamber 18; the concentration chamber 19 is equipped with a main water inlet pipe 5 and a concentrated liquid outlet pipe 2; the gas-liquid separation chamber 18 is equipped with a clear water outlet pipe 9 that is higher than the biological tank (the bottom of the tank assembly 1 is fixedly installed with support legs 6; which are connected to the front water inlet channel of the aerobic tank). The rotary disc filtration system includes a drive motor 3 and a central shaft tube 15 that is rotatably mounted inside a concentration chamber 19. The drive motor 3 is used to drive the central shaft tube 15 to rotate. Multiple rotary disc units 14 are fixed on the central shaft tube 15. The inner cavity of the rotary disc unit 14 is connected to the inner cavity of the central shaft tube 15. The rotary disc unit 14 is covered with a filter cloth. One end of the central shaft tube 15 is connected to the gas-liquid separation chamber 18. The backwashing system includes a backwashing pipeline 10 arranged in a concentration chamber 19, and a plurality of cleaning nozzles 17 are provided on the backwashing pipeline 10, with the cleaning nozzles 17 facing the filter cloth. The vacuum suction system includes a suction unit, the suction port of which is connected to the gas-liquid separation chamber 18 (the side wall of the gas-liquid separation chamber 18 has a reserved pipeline interface that is welded to the pipeline of the vacuum suction system), which is used to form a negative pressure difference on both sides of the filter cloth.

[0023] The thickening chamber 19 and the gas-liquid separation chamber 18 are integrated into the same sealed inner cavity through the housing assembly 1, which greatly reduces the overall space occupied by the equipment. The thickening chamber 19 continuously feeds the water to be treated through the main water inlet pipe 5 to form a stable liquid level. The high-concentration sludge mixture enriched in the chamber is discharged by gravity through the thickening liquid outlet pipe 2 based on the liquid level difference, without the need for an additional transfer pump, reducing power consumption and equipment maintenance workload. The gas-liquid separation chamber 18, with a clear water outlet pipe 9 that is higher than the biological treatment tank, can smoothly output filtered clear water. The drive motor 3 drives the central shaft tube 15 and the turntable unit 14 to rotate continuously. The filter cloth covering the outside of the turntable unit 14 forms a dynamic circulating filtration interface to continuously trap sludge. The inner cavity of the turntable unit 14 is connected to the central shaft tube 15 and the central shaft. Pipe 15 connects to the gas-liquid separation chamber 18 to form a closed flow channel, and dynamic filtration of water avoids static sludge accumulation, ensuring that the water treatment process is continuous and stable and is not affected by fluctuations in water quality and flow. The backwashing pipeline 10 arranged in the concentration chamber 19 is equipped with cleaning nozzles 17 facing the filter cloth, which can flush the surface of the filter cloth in real time during the rotation of the turntable unit 14 to trap sludge. The filtration operation and filter cloth cleaning are carried out simultaneously without interrupting the water treatment process. The suction unit continuously draws air from the gas-liquid separation chamber 18 to create a negative pressure difference on both sides of the filter cloth, which enhances the driving force of water to penetrate the filter cloth and effectively increases the water treatment throughput per unit area of ​​the filter cloth. The whole machine simultaneously achieves multiple beneficial effects such as reduced footprint, sludge transport without power, continuous and uninterrupted filtration, and high filtration capacity.

[0024] Specifically, the vacuum suction rotary sludge filter provided in this embodiment utilizes vacuum suction to increase filtration throughput, and the sludge concentrate is gravity-fed back into the biological treatment tank. The equipment occupies only half the area of ​​a traditional sedimentation tank, making it perfectly suited for both new wastewater treatment plants and the technical renovation of old plants.

[0025] Among them, such as Figure 1 and Figure 2 As shown, the relevant settings for housing assembly 1 are explained below: In the optional schemes of this embodiment, it is more preferred that the housing assembly 1 is an integral welded component (the concentration chamber 19 and the gas-liquid separation chamber 18 are integrally welded and connected).

[0026] Specifically, the enclosure assembly 1 is made of corrosion-resistant carbon steel or 304 stainless steel sheet, welded together in one piece; the bottom is installed on the ground via support legs 6.

[0027] In the optional scheme of this embodiment, the more preferred option is that the main water inlet pipe 5 is located at the bottom of the concentration chamber 19 (the main water inlet pipe 5 is welded to the side wall of the tank assembly 1), and the concentrate outlet pipe 2 is higher than the main water inlet pipe 5 (the concentrate outlet pipe 2 is located at the upper liquid level of the concentration chamber 19, and the pipe is directly connected to the front water inlet channel of the aerobic tank to achieve gravity-driven backflow); the main water inlet pipe 5 has multiple water distribution holes (small water distribution holes with a diameter of 8mm~15mm) evenly opened on the pipe wall, and the water flows through each water distribution hole to be evenly dispersed into the interior of the concentration chamber 19 and agitates the water in the concentration chamber 19 (the water flows through the water distribution hole to be evenly dispersed into the interior of the concentration chamber 19, and at the same time the water flow agitates the water in the concentration chamber 19 to avoid sludge sedimentation and accumulation).

[0028] In the optional schemes of this embodiment, it is more preferred that the inlet water flows through each water distribution hole to form a swirling flow for disturbing the water in the concentration chamber 19.

[0029] In the optional schemes of this embodiment, it is more preferred that the inlet of the clean water outlet pipe 9 is located at the bottom (welded) of the gas-liquid separation chamber 18, and the outlet of the clean water outlet pipe 9 is connected to the sealing tank 8; the outlet of the clean water outlet pipe 9 is located below the liquid level in the sealing tank 8.

[0030] In the optional schemes of this embodiment, a preferred embodiment is that the water sealing tank 8 is provided with a secondary water outlet pipe 7. The secondary water outlet pipe 7 is L-shaped, with its inlet higher than the outlet of the clean water outlet pipe 9, and its outlet facing downwards. The water sealing tank 8 conveys filtered clean water to the outside through the secondary water outlet pipe 7; the water sealing tank 8 mainly ensures that the vacuum of the gas-liquid separation chamber 18 is not broken.

[0031] In the optional solutions of this embodiment, a maintenance hole 16 is provided on the top of the gas-liquid separation chamber 18, and a sealing cover is provided at the maintenance hole 16 (for daily closed operation, and can be opened for maintenance of the internal turntable structure during inspection).

[0032] Among them, such as Figure 1 and Figure 2 The following are the setup instructions for the rotary filter system: Specifically, the central shaft tube 15 is made of seamless steel pipe, and the fan-shaped frame is fixed radially on the outer wall of the central shaft tube 15. The outer side is wrapped with polypropylene fiber filter cloth 13. The drive motor 3 is a variable frequency speed control motor, which can adjust the rotation speed of the turntable according to the water quality of the influent to adapt to different sludge concentration conditions.

[0033] In the optional solutions of this embodiment, the turntable unit 14 preferably includes a plurality of fan-shaped frames arranged circumferentially around the axis of the central shaft tube 15; the filter cloth is a plurality of fiber filter cloths 13, each of which corresponds to a fan-shaped frame and is wrapped around the fan-shaped frame; the inner cavity of the fan-shaped frame is connected to the central shaft tube 15.

[0034] Specifically, the drive motor 3 is connected to the central shaft tube 15 through the shaft head 4 through the side wall of the concentration chamber 19. One end of the central shaft tube 15 is arranged inside the concentration chamber 19, and the other end extends into the gas-liquid separation chamber 18. The fiber filter cloth 13 is stretched and fixed on the outside of the fan-shaped frame. The drive motor 3 drives the entire turntable structure to rotate continuously and slowly.

[0035] Specifically, under the action of pressure difference, the raw water passes through the fiber filter cloth 13 into the hollow inner cavity of the fan-shaped skeleton, then flows into the central shaft tube 15, and finally flows to the gas-liquid separation chamber 18 to complete the mud-water separation. The sludge is trapped on the outside of the fiber filter cloth 13.

[0036] Among them, such as Figures 1-3 The following are the settings instructions for the backwashing system: In the optional scheme of this embodiment, it is more preferred that one end of the backwash pipeline 10 is connected to a cleaning water source, and each cleaning nozzle 17 is connected to the backwash pipeline 10 in sections through a union joint 21. The cleaning nozzle 17 is used to spray cleaning water onto the rotating filter cloth.

[0037] Specifically, the union joint 21 facilitates pipeline disassembly and maintenance; several cleaning nozzles 17 are arranged downwards on the pipeline, and the cleaning nozzles 17 are aimed at the rotating fiber filter cloth 13 and spray cleaning water at high pressure to flush the sludge trapped on the surface of the filter cloth in real time. The filter cloth is regenerated simultaneously while the equipment is continuously filtering, without the need to stop the machine for offline cleaning.

[0038] Specifically, the backwashing pipeline 10 uses UPVC or stainless steel pipeline, the union connector 21 adopts a quick-connect structure, the cleaning nozzle 17 is a fan-shaped high-pressure spray nozzle, the spray pressure is controlled at 0.2MPa~0.3MPa, accurately rinsing the sludge on the surface of the fiber filter cloth 13, and the cleaning wastewater falls back to the concentration chamber 19 and flows back to the biological treatment tank along with the concentrate.

[0039] Among them, such as Figure 1 and Figure 2 The following are the setup instructions for the vacuum suction system: In the optional schemes of this embodiment, the preferred one is that the suction unit includes a vacuum pump (specifically a water ring vacuum pump 11) and a vacuum suction pipeline 12. The inlet of the vacuum suction pipeline 12 is connected to the suction port of the vacuum pump, and the outlet of the vacuum suction pipeline 12 is connected to the gas-liquid separation chamber 18. The vacuum pump maintains the negative pressure value of the gas-liquid separation chamber 18 at -0.03MPa to -0.05MPa (the pressure difference is reasonable, taking into account both the filtration flux and the service life of the filter cloth).

[0040] Specifically, the water ring vacuum pump 11 continuously extracts air from the gas-liquid separation chamber 18, creating a negative pressure vacuum environment in the gas-liquid separation chamber 18 and the central shaft tube 15. This creates a significant pressure difference on both sides of the fiber filter cloth 13, enhancing the power of water to penetrate the filter cloth and greatly increasing the filter cloth's filtration flux.

[0041] Specifically, the height of the outlet pipe 2 of the concentrate is designed based on the liquid level of the concentration chamber 19. By utilizing the liquid level difference, the concentrated sludge mixture can be gravity-fed back to the front end of the aerobic tank of the wastewater treatment plant, without the need for an additional sludge return pump.

[0042] Specifically, the entire equipment enclosure is an integrated welded sealed structure, and the overall footprint of the equipment is only 50% of that of a traditional sedimentation tank with the same treatment capacity.

[0043] Regarding other related settings: Specifically, the working principle is as follows: Raw water from the aerobic tank of the wastewater treatment plant is fed into the thickening chamber 19 via the main inlet pipe 5. The water distribution holes in the main inlet pipe 5 evenly distribute the raw water within the thickening chamber 19, while the water flow agitates the water, preventing sludge from settling and hardening at the bottom of the thickening chamber 19. A water ring vacuum pump 11 continuously creates a vacuum in the gas-liquid separation chamber 18 via the vacuum suction pipe 12, forming a negative pressure difference inside and outside the fiber filter cloth 13. Driven by this pressure difference, the raw water penetrates the fiber filter cloth 13, while the sludge is trapped on the outer surface of the fiber filter cloth 13. The filtered water enters the inner cavity of the fan-shaped frame and flows into the central shaft pipe 15, then is guided into the gas-liquid separation chamber 18. Inside the gas-liquid separation chamber 18, the gas is pumped by the water ring vacuum pump 11... The clean water is continuously pumped out and discharged into the sealed water tank 8 by gravity through the clean water outlet pipe 9, and then transported to the wastewater deep treatment unit through the secondary outlet pipe 7. The drive motor 3 drives the rotary filter system to rotate continuously. When the fiber filter cloth 13 covered with sludge rotates to the backwashing station, the cleaning nozzle 17 of the backwashing system sprays high-pressure cleaning water to flush and peel off the sludge on the surface of the fiber filter cloth 13 in real time. The flux of the fiber filter cloth 13 is restored immediately, and the filtration operation and backwashing are carried out simultaneously and without interruption. The high-concentration sludge mixture that is continuously enriched in the concentration chamber 19 flows back to the front end of the aerobic tank by gravity through the concentrate outlet pipe 2 under the action of the liquid level, replacing the traditional sludge return pump and completing the sludge return cycle of the biological system.

[0044] Specific supplementary explanation of the effects: Continuous and uninterrupted operation: Filtration and online backwashing are carried out simultaneously, eliminating the need to stop the machine to clean the filter cloth. The equipment operates continuously and the water treatment efficiency is significantly improved. Outstanding advantages in land use: The integrated design of the equipment occupies only half the area of ​​a sedimentation tank with the same treatment capacity, making it highly adaptable to the technical renovation projects of old sewage treatment plants with limited land resources. Energy and maintenance costs are reduced: the concentrated sludge is returned to the biological treatment tank by gravity, eliminating the need for traditional sludge return pumps and reducing their energy consumption; vacuum negative pressure suction significantly increases the filter cloth throughput, resulting in lower power consumption for water treatment; the union joint 21 design facilitates the disassembly and maintenance of the backwash pipeline 10, making maintenance convenient. Stable operating conditions: The water distribution holes in the inlet pipe continuously agitate the water in the chamber, preventing sludge from accumulating and hardening. The equipment operates stably for a long time, with minimal fluctuations in the quality of the effluent. Vacuum pressure differential filtration is more efficient at separating mud and water than pure gravity sedimentation.

[0045] Specifically, the raw water treatment process is as follows: water effluent from the aerobic tank is distributed into the concentration chamber 19 through the inlet pipe, the water is filtered through the filter cloth by vacuum pressure difference, and the clean water enters the gas-liquid separation chamber 18 and is discharged to the deep treatment unit; the filter cloth is backwashed online synchronously with the rotating disc, and the concentrated sludge is returned to the aerobic tank by gravity. The whole process operates continuously in a closed loop.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A vacuum suction type rotary disc sludge filter, characterized in that: include: The housing assembly has an internal cavity divided into a closed concentration chamber and a gas-liquid separation chamber; the concentration chamber is equipped with a main water inlet pipe and a concentrated liquid outlet pipe; the gas-liquid separation chamber is equipped with a clear water outlet pipe that is higher than that of the biological treatment tank. A rotary disc filtration system includes a drive motor and a central shaft tube rotatably mounted inside the concentration chamber. The drive motor drives the central shaft tube to rotate. Multiple rotary disc units are fixed on the central shaft tube. The inner cavity of each rotary disc unit is connected to the inner cavity of the central shaft tube. Each rotary disc unit is covered with a filter cloth. One end of the central shaft tube is connected to the gas-liquid separation chamber. A backwashing system includes a backwashing pipeline arranged in the concentration chamber, and a plurality of cleaning nozzles are provided on the backwashing pipeline, the cleaning nozzles being arranged toward the filter cloth. A vacuum suction system includes a suction unit, the suction port of which is connected to the gas-liquid separation chamber, and is used to create a negative pressure difference on both sides of the filter cloth.

2. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The main water inlet pipe is located at the bottom of the concentration chamber, and the concentrate outlet pipe is higher than the main water inlet pipe. The main water inlet pipe has multiple water distribution holes evenly distributed on its wall. The incoming water flows through each of the water distribution holes and is evenly diffused into the interior of the concentration chamber, disturbing the water in the concentration chamber.

3. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The turntable unit includes multiple fan-shaped frames arranged circumferentially around the central shaft tube axis; the filter cloth is a plurality of fiber filter cloths, each corresponding to one of the fan-shaped frames, and the fiber filter cloths are wrapped around the fan-shaped frames; the inner cavity of the fan-shaped frames is connected to the central shaft tube.

4. The vacuum suction rotary sludge filter according to claim 1, characterized in that: One end of the backwash pipeline is connected to a cleaning water source, and the backwash pipeline is connected to each of the cleaning nozzles in sections via unions. The cleaning nozzles are used to spray cleaning water onto the rotating filter cloth.

5. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The housing assembly is a single welded component.

6. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The inlet of the clean water outlet pipe is located at the bottom of the gas-liquid separation chamber, and the outlet of the clean water outlet pipe is connected to a water sealing tank; the outlet of the clean water outlet pipe is located below the liquid level in the water sealing tank.

7. The vacuum suction rotary sludge filter according to claim 6, characterized in that: The water sealing tank is equipped with a secondary water outlet pipe, which is L-shaped. The inlet of the secondary water outlet pipe is higher than the outlet of the clean water outlet pipe, and the outlet of the secondary water outlet pipe faces downward.

8. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The suction unit includes a vacuum pump and a vacuum suction pipeline. The inlet of the vacuum suction pipeline is connected to the suction port of the vacuum pump, and the outlet of the vacuum suction pipeline is connected to the gas-liquid separation chamber. The vacuum pump maintains the negative pressure value of the gas-liquid separation chamber at -0.03MPa to -0.05MPa.

9. The vacuum suction rotary sludge filter according to claim 2, characterized in that: The incoming water flows through each of the water distribution holes to form a swirling flow that disturbs the water in the concentration chamber.

10. The vacuum suction rotary sludge filter according to claim 1, characterized in that: The gas-liquid separation chamber is provided with a maintenance hole at its top, and a sealing cover is provided at the maintenance hole.

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