A sludge screening device

Abstract

The utility model provides a kind of sludge screening device, belong to water treatment technical field, including cyclone separator, gravity settling tank, reactor, cyclone separator upper and lower ends are respectively provided with light sludge overflow port, heavy sludge discharge port, light sludge overflow port is connected with gravity settling tank, heavy sludge discharge port is connected with reactor, cyclone separator is provided with water inlet on, water inlet water direction is cyclone separator tangent direction, gravity settling tank inside includes sedimentation zone and clear water zone, partition is arranged between sedimentation zone and clear water zone, inclined plate and agitating blade are arranged in sedimentation zone, annular flow guide plate is arranged in reactor, annular flow guide plate upper and lower ends are respectively provided with sludge collection plate and aeration device.The utility model uses above-mentioned a kind of sludge screening device, solves the problem that existing technology has low sludge separation efficiency, high degree of chemical agent dependence, cannot realize the problems of graded resource utilization.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a sludge screening device. Background Technology

[0002] The activated sludge process is a core technology in the field of wastewater treatment and is widely used in the treatment of urban sewage and industrial wastewater. However, its operational stability and resource utilization efficiency have long been constrained by fluctuations in sludge settling performance.

[0003] In traditional processes, the sludge mixed liquor is directly returned to the biological treatment system without graded treatment, leading to multiple technical bottlenecks. First, sludge bulking is frequent; excessive proliferation of filamentous bacteria causes the sludge settling ratio to exceed 90%, resulting in excessive suspended solids concentrations in the effluent. This forces operators to frequently add chemical agents such as polyaluminum chloride, increasing annual chemical costs by 500,000-1,000,000 yuan per 10,000 tons of treatment capacity, and aluminum ion residues can easily cause secondary pollution. Second, low-density sludge occupies the effective reactor volume, leading to greater fluctuations in organic load rates, decreased nitrification / denitrification efficiency, and difficulty in consistently meeting effluent total nitrogen concentration standards. Furthermore, mixing recyclable high-density granular sludge with low-value light sludge results in an anaerobic digestion gas production rate of less than 60%, an increase in excess sludge production of over 20%, and a moisture content still as high as 85% after dewatering, leading to persistently high disposal costs.

[0004] Physical separation technologies, such as single cyclone separators or gravity sedimentation tanks, have a separation efficiency of only 60%-70% and cannot simultaneously control the sludge granulation process. Chemical control methods rely on agents such as PAC and polyacrylamide (PAM) to enhance sedimentation, which can alleviate bulking problems in the short term, but easily leads to aluminum ion residue and increases the difficulty of sludge dewatering. Biological selector technology inhibits filamentous bacteria through alternating anoxic / aerobic operation, requiring large-scale modification of the existing process flow, with investment costs accounting for 20%-30% of the total project investment, and has poor adaptability to fluctuations in influent water quality. In addition, none of the above technologies have achieved graded resource utilization of sludge. The mixed treatment of high-value granular sludge and low-value light sludge results in low anaerobic digestion gas production efficiency and high residual sludge production, which is seriously out of sync with the requirements of pollution reduction, carbon reduction, and recycling under the "dual carbon" goal. Utility Model Content

[0005] The purpose of this invention is to provide a sludge screening device that solves the problems of low sludge separation efficiency, high dependence on chemical agents leading to secondary pollution, inability to achieve graded resource utilization, and weak system resistance in the existing technology, which makes it difficult to meet the needs of improving the quality and efficiency of sewage treatment and green and low-carbon development.

[0006] To achieve the above objectives, this utility model provides a sludge screening device, including a hydrocyclone separator, a gravity settling tank, and a reactor. The hydrocyclone separator has a light sludge overflow port and a heavy sludge discharge port at its upper and lower ends, respectively. The light sludge overflow port is connected to the gravity settling tank, and the heavy sludge discharge port is connected to the reactor. The hydrocyclone separator is provided with a water inlet, and the water inlet direction is tangential to the hydrocyclone separator. The gravity settling tank includes a sedimentation zone and a clear water zone, and a partition is provided between the sedimentation zone and the clear water zone. The sedimentation zone is provided with an inclined plate and stirring blades. The reactor is provided with an annular guide plate, and the upper and lower ends of the annular guide plate are provided with a sludge collection plate and an aeration device, respectively.

[0007] Preferably, the cyclone separator is provided with a first layer of filter screen, a second layer of filter screen, and an anti-clogging filter screen from bottom to top. The anti-clogging filter screen is located below the light sludge overflow port, and the first layer of filter screen is located above the water inlet. The pore size of the first layer of filter screen is larger than that of the second layer of filter screen.

[0008] Preferably, a sludge suction pump is installed at the heavy sludge discharge outlet, which is connected to the bottom of the reactor.

[0009] Preferably, the stirring blades are located at the top of the sedimentation zone, one end of the inclined plate is fixedly connected to the partition, the bottom of the partition has holes, and the bottom of the sedimentation zone is provided with a sludge discharge hopper.

[0010] Preferably, the inclined plate is equipped with a mud-blocking plate, the inclination angle of the inclined plate is 45°-60°, and the inclined plate is made of polymer material.

[0011] Preferably, the lightweight sludge overflow outlet is connected above the sedimentation zone, and the clear water zone has a drain outlet.

[0012] Preferably, the aeration device is installed at the bottom of the reactor, and the sludge collection plate is positioned above the annular guide plate, with a through hole in the middle of the sludge collection plate.

[0013] Therefore, the present invention employs the above-mentioned sludge screening device, and the technical effects are as follows: 1. Synergistic Separation and Granulation: Integrating cyclone separation, gravity sedimentation and hydraulic shearing technologies, sludge is recycled in stages according to density, while simultaneously promoting the formation of granular sludge and improving the stability of the biological system.

[0014] 2. Low energy consumption and resource utilization: Reduce reliance on chemical agents and lower operating costs; heavy sludge is directly used for gas production, while light sludge is utilized for resource utilization, which meets the "dual carbon" target.

[0015] 3. Anti-clogging structure and long-term operation: Optimized filter screen, inclined plate and sludge discharge design extend equipment maintenance cycle and are suitable for large-scale sewage treatment plants. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a sludge screening device according to the present invention; Figure 2 This is a schematic diagram of the first layer filter screen structure of a sludge screening device according to the present invention; Figure 3 This is a schematic diagram of the second layer filter screen structure of a sludge screening device according to the present invention.

[0017] Figure Labels 1. Cyclone separator; 2. Gravity settling tank; 3. Reactor; 4. Inlet; 5. Heavy sludge outlet; 6. First filter screen; 7. Second filter screen; 8. Anti-clogging filter screen; 9. Light sludge overflow outlet; 10. Sedimentation zone; 11. Clear water zone; 12. Agitator blades; 13. Inclined plate; 14. Baffle plate; 15. Sludge baffle plate; 16. Sludge hopper; 17. Drain outlet; 18. Sludge pump; 19. Annular guide plate; 20. Aeration device; 21. Sludge collection plate. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0020] Example 1 like Figures 1-3 As shown, this utility model provides a sludge screening device, which consists of three core components: a hydrocyclone separator 1, a gravity settling tank 2, and a reactor 3. Material flow is achieved through pipelines and pumps. The working process of the above device is roughly divided into a preliminary separation stage, a light sludge deep treatment stage, and a heavy sludge deep treatment stage.

[0021] The hydrocyclone separator 1, as a key component for the initial separation of sludge, has a light sludge overflow port 9 and a heavy sludge discharge port 5 at its upper and lower ends, respectively. An inlet 4 is provided on the hydrocyclone separator 1, with the water inlet 4 tangential to the hydrocyclone separator 1. This allows the incoming sludge mixture to form a rotating water flow inside the hydrocyclone separator 1. Utilizing the principle that sludge particles of different densities experience different centrifugal forces in the rotating water flow, the initial separation of light and heavy sludge is achieved. The water inlet 4 of the hydrocyclone separator 1 is tangential, and the sludge mixture forms a rotating water flow upon entry. Sludge particles of different densities experience different centrifugal forces in the rotating water flow; heavy sludge particles, due to the greater centrifugal force, are thrown towards the separator wall and sink along it; light sludge particles, with less centrifugal force, concentrate in the central area, thus achieving the initial separation of light and heavy sludge.

[0022] The hydrocyclone separator 1 is internally equipped with a first filter screen 6, a second filter screen 7, and an anti-clogging filter screen 8, arranged from bottom to top. The first filter screen 6 is located above the inlet 4 and its function is to perform preliminary filtration of the incoming sludge mixture, intercepting larger particles of impurities. The pore size of the first filter screen 6 is larger than that of the second filter screen 7, allowing the second filter screen 7 to further refine the sludge mixture and improve the separation effect. The anti-clogging filter screen 8 is located below the light sludge overflow outlet 9 to prevent light sludge from clogging the overflow outlet during overflow, ensuring the normal operation of the device.

[0023] The light sludge overflow outlet 9 is connected to the gravity settling tank 2. After preliminary separation by the hydrocyclone separator 1, the light sludge enters the gravity settling tank 2 through the overflow outlet for further treatment. The heavy sludge discharge outlet 5 is equipped with a sludge suction pump 18, which is connected to the bottom of the reactor 3. Under the action of the sludge suction pump 18, the heavy sludge is transported into the reactor 3 for subsequent treatment.

[0024] The gravity sedimentation tank 2 includes a sedimentation zone 10 and a clear water zone 11. A partition 14 is installed between the sedimentation zone 10 and the clear water zone 11, dividing the gravity sedimentation tank 2 into two relatively independent but interconnected areas. The sedimentation zone 10 is equipped with inclined plates 13 and stirring blades 12. The stirring blades 12 are located at the top of the sedimentation zone 10, and their function is to agitate the liquid in the upper layer of the sedimentation zone 10 to a certain extent, preventing sludge from accumulating and forming clumps on the upper layer of the sedimentation zone 10, thus affecting the sedimentation effect.

[0025] One end of the inclined plate 13 is fixedly connected to the partition plate 14. A sludge-blocking plate 15 is installed on the inclined plate 13, which effectively prevents sludge particles from rising with the water flow, further improving sedimentation efficiency. The inclination angle of the inclined plate 13 is 45°-60°, which is conducive to the sedimentation and sliding of sludge particles on the inclined plate 13. The inclined plate 13 is made of a high-polymer material, which has the advantages of corrosion resistance, high strength, and long service life, and can adapt to the harsh environment in the sludge treatment process. The partition plate 14 has holes at the bottom, and a sludge discharge hopper 16 is installed at the bottom of the sedimentation zone 10. The settled sludge enters the sludge discharge hopper 16 through the holes, which facilitates the periodic discharge of settled sludge.

[0026] The light sludge overflow outlet 9 is connected above the sedimentation zone 10. After the light sludge overflowing from the hydrocyclone separator 1 enters the sedimentation zone 10, the sludge particles gradually settle to the bottom of the sedimentation zone 10 under the action of gravity, while the clearer water rises to the clear water zone 11. The clear water zone 11 is provided with a drain outlet 17. The clear water after sedimentation treatment is discharged from the device through the drain outlet 17, realizing the separation of water and light sludge.

[0027] The reactor 3 is equipped with an annular guide plate 19, and a sludge collection plate 21 and an aeration device 20 are respectively installed at the upper and lower ends of the annular guide plate 19. The aeration device 20 is installed at the bottom of the reactor 3. By introducing air into the reactor 3, it provides sufficient oxygen for the microorganisms in the reactor 3, promotes the decomposition and transformation of organic matter in the heavy sludge by the microorganisms, and realizes the reduction and stabilization treatment of sludge.

[0028] The sludge collection plate 21 is positioned above the annular guide plate 19, and has a through hole in the middle. The annular guide plate 19 guides the water flow in the reactor 3 to form a specific flow path, allowing the sludge particles to better contact with microorganisms during the flow process, thereby improving treatment efficiency. The sludge collection plate 21 is used to collect the sludge generated during the treatment process, and the sludge can be further discharged or subjected to subsequent treatment through the through hole.

[0029] Therefore, this utility model adopts the above-mentioned sludge screening device, which achieves preliminary separation of light and heavy sludge through tangential water inlet of the hydrocyclone separator and multi-layer filter screen. The gravity sedimentation tank completes the separation of light sludge and clear water with structures such as inclined plate sedimentation and stirring blades. The reactor uses aeration devices and annular guide plates to reduce and stabilize the heavy sludge, forming an efficient and complete sludge screening and treatment system. This provides key technical support for the quality improvement, efficiency enhancement and green transformation of sewage treatment plants, and has significant economic and environmental benefits.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A sludge screening device, characterized in that, The system includes a hydrocyclone separator, a gravity settling tank, and a reactor. The hydrocyclone separator has a light sludge overflow outlet and a heavy sludge discharge outlet at its upper and lower ends, respectively. The light sludge overflow outlet is connected to the gravity settling tank, and the heavy sludge discharge outlet is connected to the reactor. The hydrocyclone separator is equipped with a water inlet, and the water inlet is tangential to the hydrocyclone separator. The gravity settling tank includes a sedimentation zone and a clear water zone, with a partition between the sedimentation zone and the clear water zone. The sedimentation zone is equipped with inclined plates and stirring blades. The reactor is equipped with an annular guide plate, with sludge collection plates and aeration devices at its upper and lower ends, respectively.

2. The sludge screening device according to claim 1, characterized in that, The hydrocyclone separator is equipped with a first layer of filter screen, a second layer of filter screen, and an anti-clogging filter screen from bottom to top. The anti-clogging filter screen is located below the light sludge overflow port, and the first layer of filter screen is located above the water inlet. The pore size of the first layer of filter screen is larger than that of the second layer of filter screen.

3. The sludge screening device according to claim 1, characterized in that, A sludge suction pump is installed at the heavy sludge discharge outlet, which is connected to the bottom of the reactor.

4. The sludge screening device according to claim 1, characterized in that, The stirring blades are located at the top of the sedimentation zone, one end of the inclined plate is fixedly connected to the baffle, the bottom of the baffle has holes, and the bottom of the sedimentation zone is equipped with a sludge discharge hopper.

5. The sludge screening device according to claim 1, characterized in that, The inclined plate is equipped with a mud-blocking plate, and the inclination angle of the inclined plate is 45°-60°. The inclined plate is made of polymer material.

6. The sludge screening device according to claim 1, characterized in that, The light sludge overflow outlet is connected above the sedimentation zone, and the clear water zone has a drainage outlet.

7. The sludge screening device according to claim 1, characterized in that, The aeration device is installed at the bottom of the reactor, and the mud collection plate is set above the annular guide plate. The mud collection plate has a through hole in the middle.

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