A municipal sewage treatment plant

Abstract

This invention belongs to the field of municipal wastewater treatment technology, specifically disclosing a municipal wastewater treatment device, including a base plate. A separation tank is connected to one side of the upper end of the base plate, a treatment tank is connected to one side of the separation tank, and a filter tank is connected to one side of the treatment tank. The lower ends of the separation tank and the treatment tank are connected to the upper end of the base plate. A liquid conveying mechanism is connected to one side of the upper end of the base plate. The liquid conveying mechanism transports liquid from the lower part of the separation tank to the treatment tank and liquid from the lower part of the treatment tank to the filter tank. A sludge discharge mechanism is connected to the upper part of the inner wall of the separation tank. The sludge discharge mechanism realizes the automatic separation and centralized collection of sludge in the sludge-containing wastewater. Then, the collected sludge is subjected to flocculation, compression, and dewatering treatment by a solid-liquid separation mechanism. This achieves integrated continuous operation of efficient separation, collection, and dewatering of sludge from wastewater, significantly improving sludge treatment efficiency and reducing the need for manual intervention.

Description

Technical Field

[0001] This invention belongs to the field of municipal wastewater treatment, and specifically discloses a municipal wastewater treatment device. Background Technology

[0002] Municipal wastewater, as a major type of wastewater generated during urban development, is of great significance for protecting the water environment and realizing the recycling of water resources. With the acceleration of urbanization and increasingly stringent environmental standards in my country, municipal wastewater treatment facilities face the dual pressure of improving treatment capacity and effluent quality. Municipal wastewater contains a large amount of suspended solids, organic pollutants, and a wide variety of impurities. In particular, the mixed liquor of primary sludge and residual activated sludge has a high concentration of suspended solids and a complex composition. Direct discharge will not only pollute the receiving water body but also increase the load on subsequent treatment units. Therefore, effective filtration and separation of municipal sludge-containing wastewater to remove suspended solids and impurities is a key link in ensuring the stable operation of the entire wastewater treatment system and achieving efficient sludge-water separation.

[0003] Currently, the filtration treatment of municipal wastewater typically employs multi-stage methods such as bar screen interception, sedimentation separation, and filter media filtration. However, in practical engineering applications, existing filtration devices often suffer from technical problems such as unsatisfactory solid-liquid separation, easy clogging of filter components, frequent backwashing, and high energy consumption. Especially when treating high-concentration sludge-containing wastewater, the sludge discharge port of traditional filtration equipment is prone to clogging, resulting in the inability to discharge sludge in a timely manner and affecting filtration efficiency. At the same time, the sludge separated by filtration is prone to sedimentation and compaction during collection and temporary storage, further increasing the difficulty of sludge discharge. In addition, most filtration devices are poorly connected to subsequent sludge treatment equipment, with many intermediate links, which not only increases the equipment footprint and investment costs but also easily causes secondary pollution during sludge transfer. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a municipal wastewater treatment device.

[0005] To achieve the above objectives, the present invention provides a municipal sewage treatment device, including a base plate, a separation tank connected to one side of the upper end of the base plate, a treatment tank connected to one side of the separation tank, a filter tank connected to one side of the treatment tank, and the lower ends of the separation tank and the treatment tank connected to the upper end of the base plate. A liquid delivery mechanism is connected to one side of the upper end of the base plate. The liquid delivery mechanism delivers the liquid inside the lower part of the separation tank to the processing tank, and delivers the liquid inside the lower part of the processing tank to the filtration tank. The upper part of the inner wall of the separator is connected to a sludge discharge mechanism, which includes a partition. A crossbar is connected to one side of the separator above the partition. There are two sets of crossbars. A sliding rod is slidably connected to one side of each of the two crossbars. One side of each sliding rod is arc-shaped. A connecting ring is connected between the two sliding rods. A filter cylinder is rotatably connected between the two connecting rings. A discharge ring is connected to one end of the filter cylinder. The discharge ring is funnel-shaped. The crossbars, sliding rods, and filter cylinder are all inclined. A water guide ring is connected to the upper end of the partition, a collection box is connected to the lower end of the partition, a mud conveying pipe is connected to the middle of the lower end of the collection box, and a solid-liquid separation mechanism is connected to one end of the mud conveying pipe.

[0006] Preferably, the infusion mechanism includes a first feed pump, the input end of which extends through into the interior of the separation tank, and the output end of which is connected to a first feed pipe. One end of the first feed pipe extends through into the interior of the processing tank. A second feed pump is connected to the upper end of the base plate corresponding to one side of the processing tank. The input end of the second feed pump extends through into the interior of the processing tank, and the output end of the second feed pump is connected to a second feed pipe. One end of the second feed pipe extends through into the interior of the filter tank, and a liquid outlet pipe is connected to the lower part of one side of the filter tank.

[0007] Preferably, sliders are evenly connected to both sides of the outer wall of the filter cartridge, and grooves are opened on the inner walls of the two connecting rings corresponding to the sliders. Several sliders slide inside the two grooves respectively. The cross-sectional shape of the sliders and the cross-sectional shape of the grooves are both inverted T-shaped. Spiral blades are connected to the inner wall of the filter cartridge.

[0008] Preferably, one end of each of the two slide rods is connected to a pull plate, the pull plate being arc-shaped and its overall shape matching the shape of one side of the separator. A handle is connected to the lower part of one side of the pull plate, and a feed pipe is connected to one side of the pull plate. One end of the feed pipe passes through the pull plate and the filter cartridge in sequence and extends into the interior of the filter cartridge. A screen is set in the middle of the outer wall of the filter cartridge, and a drive mechanism is connected to the upper part of one side of the pull plate.

[0009] Preferably, the driving mechanism includes a drive motor, a drive gear is connected to the outer wall of the output end of the drive motor, a connecting gear ring is meshed below the drive gear, the inside of the connecting gear ring is connected to one side of the outer wall of the filter cartridge, a retaining ring is connected to one side of the connecting gear ring, the inner wall of the retaining ring is connected to one side of the outer wall of the filter cartridge, and the retaining ring is used to protect the connecting gear ring.

[0010] Preferably, the cross-sectional shape of the water guide ring is inclined, the upper middle part of the partition plate is open, the upper end of the collection box passes through the partition plate and the water guide ring in sequence, the upper end of the collection box is funnel-shaped, one end of the sludge conveying pipe extends through to one side of the separation tank, the shape of one end of the sludge conveying pipe is inclined, a connecting pump is connected to one side of the upper end of the water guide ring, the input end of the connecting pump is connected to the liquid inlet pipe, the lower end of the liquid inlet pipe passes through the water guide ring and the partition plate in sequence and extends to the lower end of the partition plate, the output end of the connecting pump is connected to the output pipe, the upper end of the output pipe is connected to the water spray pipe, and a water spray nozzle is connected to one side of the water spray pipe.

[0011] Preferably, the solid-liquid separation mechanism includes a premixing cylinder, an inlet pipe connected to one side of the upper end of the premixing cylinder, a discharge pipe connected to the middle of the lower end of the premixing cylinder, a discharge valve provided on the discharge pipe, and a premixing device connected inside the premixing cylinder, the premixing device consisting of a premixing motor, a premixing rod and premixing blades.

[0012] Preferably, the lower end of the feed pipe is connected to an extrusion cylinder, one side of the inner wall of the extrusion cylinder is connected to a screen cylinder, the middle of one side of the extrusion cylinder is connected to an extrusion auger, the extrusion auger is located inside the screen cylinder, one end of the extrusion auger is driven by an extrusion motor, one end of the extrusion motor is fixed to one side of the extrusion cylinder, the middle of the lower end of the extrusion cylinder is connected to a drain pipe, one end of the extrusion cylinder is connected to a connecting frame, one side of the connecting frame is connected to an extrusion cylinder, the output end of the extrusion cylinder extends through to one side of the connecting frame, one end of the extrusion cylinder is connected to an extrusion block, and one end of the extrusion block has a conical cross-sectional shape.

[0013] Preferably, a rotary motor is connected to the middle of the upper end of the processing tank, the output end of the rotary motor extends through into the interior of the processing tank, stirring rods are connected to both sides of the outer wall of the output end of the rotary motor, stirring blades are connected to the lower end of the output end of the rotary motor, and multiple stirring rods and stirring blades are located inside the processing tank, and filter screens are uniformly connected to the inner wall of the filter tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The sludge discharge mechanism adopts a structural design combining an inclined filter cartridge and spiral blades. The filter cartridge is inclined with its lowest point directly above the collection box. This allows the trapped sludge to move along the filter cartridge towards the lower end under the combined action of the spiral blades and gravity, and finally fall smoothly into the collection box through the funnel-shaped discharge ring. This effectively avoids sludge retention and accumulation inside the filter cartridge, significantly improving the smoothness and reliability of sludge discharge. Simultaneously, the filter cartridge utilizes an inverted T-shaped structure with a slider and a groove on the inner wall of the connecting ring. This ensures rotational stability and facilitates the removal of the entire filter cartridge mechanism from the separation tank for inspection and maintenance via a pull plate, greatly reducing equipment maintenance difficulty and downtime.

[0015] A water spray pipe is installed above the sludge discharge mechanism. A pump is connected to the pipe to periodically extract wastewater temporarily stored at the bottom of the separator. The water spray pipe is then used to perform high-pressure cleaning on the outer surface of the filter cartridge. This ensures the cleanliness of the filter cartridge screen and prevents clogging that could affect filtration efficiency. It also avoids water waste and excessive sludge dilution caused by continuous spraying. The residual sludge washed off, along with a small amount of water, flows down the outer wall of the filter cartridge and is discharged into the collection box through the discharge ring. This achieves a coordinated cleaning and sludge discharge, further optimizing the sludge discharge effect.

[0016] The discharged sludge is collected centrally in the collection box and transported to the solid-liquid separation unit via an inclined sludge conveying pipe. The inclined pipe design facilitates the smooth flow of sludge under gravity, preventing pipe blockage. The upper end of the collection box is funnel-shaped, which effectively expands the receiving area and ensures that the sludge discharged from the filter cartridge falls completely into it, preventing sludge from scattering to other areas of the separation tank. This makes the entire sludge discharge process cleaner and more efficient, providing a stable and reliable material guarantee for subsequent sludge dewatering treatment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the connection structure between the solid-liquid separation mechanism and the sludge discharge mechanism of the present invention; Figure 3 This is an overall cross-sectional view of the device of the present invention; Figure 4 This is a schematic diagram of the connection structure between the partition and the filter cartridge of the present invention; Figure 5 This is a schematic diagram of the connection structure between the two connecting rings and the filter cartridge of the present invention; Figure 6 This is a schematic diagram of the connection structure between the connecting ring and the slider of the present invention; Figure 7 This is a schematic diagram of the internal structure of the solid-liquid separation mechanism of the present invention.

[0018] In the diagram: 1. Base plate; 2. Separation tank; 3. Processing tank; 4. Filter tank; 5. First feed pump; 6. First feed pipe; 7. Second feed pump; 8. Second feed pipe; 9. Discharge pipe; 10. Baffle plate; 11. Crossbar; 12. Slide bar; 13. Connecting ring; 14. Filter cartridge; 15. Sliding block; 16. Spiral blade; 17. Pull plate; 18. Feed pipe; 19. Drive motor; 20. Drive gear; 21. Connecting gear ring; 2. Water guide ring; 23. Discharge ring; 24. Collection box; 25. Sludge conveying pipe; 26. Premixing cylinder; 27. Feed pipe; 28. Discharge pipe; 29. ​​Extrusion cylinder; 30. Screen cylinder; 31. Extrusion auger; 32. Drain pipe; 33. Connecting frame; 34. Extrusion cylinder; 35. Extrusion block; 36. Rotary motor; 37. Stirring rod; 38. Stirring blade; 39. Filter screen; 40. Connecting pump; 41. Liquid inlet pipe; 42. Water spray pipe. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0021] like Figures 1-7The municipal wastewater treatment equipment shown includes a base plate 1, a separation tank 2 connected to one side of the upper end of the base plate 1, a treatment tank 3 connected to one side of the separation tank 2, and a filter tank 4 connected to one side of the treatment tank 3. The lower ends of the separation tank 2 and the treatment tank 3 are connected to the upper end of the base plate 1. A liquid conveying mechanism is connected to one side of the upper end of the base plate 1. The liquid conveying mechanism transports the liquid from the lower part of the separation tank 2 to the treatment tank 3 and the liquid from the lower part of the treatment tank 3 to the filter tank 4. A sludge discharge mechanism is connected to the upper part of the inner wall of the separation tank 2. A water guide ring 22 is connected to the upper end of a partition 10, and a collection box 24 is connected to the lower end of the partition 10. A sludge conveying pipe 25 is connected to the middle of the lower end of the collection box 24. A sludge conveying pump (not shown in the figure) can be connected in series on the sludge conveying pipe 25 as needed. The sludge falling into the collection box 24 is conveyed by the sludge conveying pipe 25. The sludge conveying pipe 25 of the pump delivers sludge to the premixing cylinder 26 of the solid-liquid separation mechanism. The sludge conveying pump provides power for sludge conveying, avoids pipe blockage caused by low sludge moisture content, and ensures smooth conveying. One end of the sludge conveying pipe 25 is connected to the solid-liquid separation mechanism. The conveying mechanism includes a first conveying pump 5. The input end of the first conveying pump 5 extends through into the interior of the separation tank 2. The output end of the first conveying pump 5 is connected to a first conveying pipe 6. One end of the first conveying pipe 6 extends through into the interior of the treatment tank 3. A second conveying pump 7 is connected to the upper end of the bottom plate 1 corresponding to one side of the treatment tank 3. The input end of the second conveying pump 7 extends through into the interior of the treatment tank 3. The output end of the second conveying pump 7 is connected to a second conveying pipe 8. One end of the second conveying pipe 8 extends through into the interior of the filter tank 4. A liquid outlet pipe 9 is connected to the lower part of one side of the filter tank 4. Separation tank 2, as the first-stage treatment unit, is mainly used for solid-liquid separation of incoming municipal muddy wastewater. Treatment tank 3, as the second-stage treatment unit, is used for stirring, mixing, and chemical treatment of the initially separated wastewater. Filter tank 4, as the third-stage treatment unit, is used for fine filtration of wastewater to ensure the quality of the effluent. In the infusion mechanism, the first feed pump 5 delivers the supernatant in the separation tank 2 to the processing tank 3 through the first feed pipe 6, and the second feed pump 7 delivers the processed liquid in the processing tank 3 to the filter tank 4 through the second feed pipe 8, so as to realize the orderly delivery of liquid between each unit. The partition 10 divides the separation tank 2 into an upper filtration zone and a lower liquid storage zone. The inclined structure of the water guide ring 22 guides the filtered liquid to flow to the lower part of the tank. The upper end of the collection box 24 is flared to expand the receiving area and ensure that the discharged sludge falls completely into it. The sludge conveying pipe 25 transports the collected sludge to the solid-liquid separation mechanism for dewatering.

[0022] like Figures 2-3As shown: A rotary motor 36 is connected to the middle of the upper end of the processing tank 3. The output end of the rotary motor 36 extends through into the interior of the processing tank 3. Stirring rods 37 are connected to both sides of the outer wall of the output end of the rotary motor 36. Stirring blades 38 are connected to the lower end of the output end of the rotary motor 36. Multiple stirring rods 37 and stirring blades 38 are located inside the processing tank 3. Filter screens 39 are evenly connected to the inner wall of the filter tank 4. The rotary motor 36 inside the treatment tank 3 drives the stirring rod 37 and stirring blades 38 to rotate synchronously, ensuring that the flocculant and other treatment agents fully contact and react with the wastewater. The filter screen 39 on the inner wall of the filter tank 4 adopts a gradient filtration structure formed by stacking multiple layers of stainless steel filter screens 39 with different pore sizes. The pore size gradually decreases from top to bottom, intercepting suspended particles of different sizes step by step. This ensures filtration accuracy and avoids the problem of easy clogging of single-layer filter screens 39, thus extending the cleaning cycle. The filtered clean water is discharged from the equipment through the liquid outlet pipe 9 and can be reused or discharged in compliance with standards.

[0023] like Figures 3-5 As shown: The sludge discharge mechanism includes a partition plate 10. A crossbar 11 is connected to one side of the separation tank 2 above the partition plate 10. There are two sets of crossbars 11. Each of the two crossbars 11 has a sliding rod 12 slidably connected to one side. Each of the two sliding rods 12 has an arc-shaped structure on one side. A connecting ring 13 is connected between the two sliding rods 12. A filter cylinder 14 is rotatably connected between the two connecting rings 13. The crossbars 11, sliding rods 12, two connecting rings 13, and filter cylinder 14 are arranged in an inclined manner, with the lowest point located above the collection box 24. One end of the filter cylinder 14 is connected to a discharge ring 23, which is funnel-shaped. Sliding blocks 15 are evenly connected to both sides of the outer wall of the filter cylinder 14. The inner walls of the two connecting rings 13 correspond to the sliding blocks 15. All are provided with sliding grooves, and several sliders 15 slide inside two sliding grooves respectively. The cross-sectional shape of the sliders 15 and the cross-sectional shape of the sliding grooves are both inverted T-shaped. The inner wall of the filter cylinder 14 is connected with a spiral blade 16. One end of the two sliding rods 12 is connected with a pull plate 17. The pull plate 17 is arc-shaped and its overall shape matches the shape of one side of the separator 2. A handle is connected to the lower part of one side of the pull plate 17. A feed pipe 18 is connected to one side of the pull plate 17. One end of the feed pipe 18 passes through the pull plate 17 and the filter cylinder 14 and extends into the interior of the filter cylinder 14. The middle part of the outer wall of the filter cylinder 14 is set with a screen. A drive mechanism is connected to the upper part of one side of the pull plate 17. The sludge discharge mechanism adopts a pull-out modular design, which can be removed as a whole for maintenance. The filter cylinder 14 achieves stable rotation through the sliding groove of the inner wall of the connecting ring 13 and the slider 15. The inverted T-shaped structure of the slider 15 and the sliding groove not only ensures the guidance of the filter cylinder 14 when rotating, but also prevents the filter cylinder 14 from moving axially. The crossbar 11, the sliding bar 12, the connecting ring 13 and the filter cylinder 14 are set in an inclined position, and the lowest end is located above the collection box 24. When the filter cylinder 14 is rotated by the drive mechanism, the sludge-containing wastewater entering the filter cylinder 14 flows through the screen in the middle of the filter cylinder 14 into the lower part of the separation tank 2 under the combined action of centrifugal force and gravity. The sludge and solid impurities are trapped on the inner wall of the filter cylinder 14. The spiral blades 16 on the inner wall of the filter cylinder 14 rotate with the filter cylinder 14, pushing the intercepted sludge to the lower end, and finally smoothly discharged through the funnel-shaped discharge ring 23, and fall directly into the collection box 24 directly below by gravity. The pull plate 17 is adapted to the shape of one side of the separation tank 2. The slide bar 12 can be pulled along the cross bar 11 by the handle to pull the slide bar 12 to slide out of the separation tank 2 for easy inspection and maintenance. The feed pipe 18 extends through the pull plate 17 into the interior of the filter cylinder 14 to ensure that the muddy wastewater enters the filter cylinder 14 stably for separation treatment.

[0024] like Figures 5-6 As shown: The drive mechanism includes a drive motor 19, a drive gear 20 connected to the outer wall of the output end of the drive motor 19, a connecting gear ring 21 meshing below the drive gear 20, the inside of the connecting gear ring 21 being connected to one side of the outer wall of the filter cartridge 14, a retaining ring being connected to one side of the connecting gear ring 21, the inner wall of the retaining ring being connected to one side of the outer wall of the filter cartridge 14, and the retaining ring being used to protect the connecting gear ring 21; The drive motor 19 is fixedly installed on the upper part of one side of the pull plate 17. The drive gear 20 is coaxially fixedly installed on the outer wall of the output end of the drive motor 19 and rotates synchronously with the output end of the drive motor 19. The connecting gear ring 21 is a ring gear structure. Its inner ring is fixedly connected to one side of the outer wall of the filter cartridge 14, and its outer ring is provided with teeth that match the drive gear 20. The drive gear 20 is meshed with the lower part of the connecting gear ring 21.

[0025] The outer diameter of the retaining ring is larger than the outer diameter of the connecting toothed ring 21, forming a side cover protection for the connecting toothed ring 21, which can effectively prevent external debris or sludge from entering the meshing area of ​​the connecting toothed ring 21, and avoid foreign objects from getting stuck or wearing the gear.

[0026] like Figure 5As shown: the cross-sectional shape of the water guide ring 22 is inclined, the upper middle part of the partition 10 is open, the upper end of the collection box 24 passes through the partition 10 and the water guide ring 22 in sequence, the upper end of the collection box 24 is funnel-shaped, one end of the mud conveying pipe 25 extends through to one side of the separation tank 2, the shape of one end of the mud conveying pipe 25 is inclined, a connecting pump 40 is connected to one side of the upper end of the water guide ring 22, the input end of the connecting pump 40 is connected to the liquid inlet pipe 41, the lower end of the liquid inlet pipe 41 passes through the water guide ring 22 and the partition 10 in sequence and extends to the lower end of the partition 10, the output end of the connecting pump 40 is connected to the output pipe, the upper end of the output pipe is connected to the water spray pipe 42, and a water spray nozzle is connected to one side of the water spray pipe 42; The water guide ring 22 allows the filtered liquid to flow downward along the ring surface, preventing the liquid from accumulating above the baffle 10 and accelerating the flow of the liquid to the lower part of the separator 2. The flared structure of the collection box 24 ensures that the sludge discharged from the upper filter cartridge 14 falls completely into the collection box 24, preventing the sludge from scattering to other areas of the separator 2. The inclined pipe of the sludge conveying pipe 25 facilitates the smooth flow of sludge under gravity and prevents sludge from accumulating in the pipe and causing blockage. The connecting pump 40 intermittently extracts the preliminary separation liquid temporarily stored in the separation tank 2 below the baffle 10. Since the suspended solids content in the liquid initially separated by the filter cartridge 14 has been greatly reduced, using this liquid for backwashing can effectively clean the filter cartridge and avoid the waste of resources and sludge dilution caused by using external clean water. The outer surface of the filter cartridge 14 is cleaned by high-pressure spraying through the spray pipe 42. The residual sludge washed off by the spray passes through the screen of the filter cartridge 14 along with the cleaning water and enters the interior of the filter cartridge 14. After mixing with the muddy wastewater inside, it moves towards the discharge ring 23 under the push of the spiral blades 16 and is finally discharged into the collection box 24, realizing the self-cleaning of the filter cartridge and the continuous discharge of sludge.

[0027] like Figure 7 As shown: The solid-liquid separation mechanism includes a premixing cylinder 26. A feed pipe 27 is connected to one side of the upper end of the premixing cylinder 26, and a discharge pipe 28 is connected to the middle of the lower end of the premixing cylinder 26. A discharge valve is connected to the outer wall of the discharge pipe 28. A premixing device is connected inside the premixing cylinder 26. The premixing device consists of a premixing motor, a premixing rod, and premixing blades. The premixing motor is fixed inside the premixing cylinder 26. The output end of the premixing motor is connected to the premixing rod. Multiple premixing blades are connected to both sides of the premixing rod. It is used to premix sludge and flocculant. The lower end of the premixing cylinder 26 is conical so that the sludge mixed with the flocculant is discharged into the extrusion cylinder 29 through the discharge pipe 28. The premixing cylinder 26 performs flocculation pretreatment on the collected sludge. The sludge enters the premixing cylinder 26 through the feed pipe 27. After the premixing equipment is started, the premixing motor drives the premixing rod and premixing blades to rotate, which fully mixes the sludge with the flocculant added through the feed pipe 27 to form flocculent sludge. The sludge is then discharged into the extrusion cylinder 29 through the discharge pipe 28 for subsequent extrusion and dewatering. The discharge valve connected to the outer wall of the discharge pipe 28 is used to control the start and stop of sludge discharge and the flow rate, so as to achieve coordinated cooperation with the extrusion process.

[0028] like Figure 7 As shown: The lower end of the feed pipe 28 is connected to the extrusion cylinder 29. The inner wall of the extrusion cylinder 29 is connected to the screen cylinder 30. The lower end of the feed pipe 28 extends through to the inside of the screen cylinder 30, and the sludge material directly enters the inside of the screen cylinder 30. The middle of one side of the extrusion cylinder 29 is connected to the extrusion auger 31. The extrusion auger 31 is located inside the screen cylinder 30. One end of the extrusion auger 31 is driven by the extrusion motor. One end of the extrusion motor is fixed to one side of the extrusion cylinder 29. The middle of the lower end of the extrusion cylinder 29 is connected to the drain pipe 32. One end of the extrusion cylinder 29 is connected to the connecting frame 33. One side of the connecting frame 33 is connected to the extrusion cylinder 34. The output end of the extrusion cylinder 34 extends through to one side of the connecting frame 33. One end of the extrusion cylinder 34 is connected to the extrusion block 35. The cross-sectional shape of one end of the extrusion block 35 is a conical structure. The pre-mixed and flocculated sludge enters the screen cylinder 30 inside the extrusion cylinder 29 through the feed pipe 28. The screen cylinder 30 is a cylindrical filter structure with uniformly opened filtrate discharge holes on the cylinder wall. The extrusion auger 31 is coaxially installed inside the screen cylinder 30 and is driven to rotate by the extrusion motor. Its spiral blades 16 maintain an appropriate gap with the inner wall of the screen cylinder 30. During the rotation, the extrusion auger 31 continuously pushes the sludge to one end of the extrusion cylinder 29. Through the spiral extrusion action, the water in the sludge is gradually squeezed out. The squeezed liquid flows out through the screen holes of the screen cylinder 30 to the annular space between the inner wall of the extrusion cylinder 29 and the screen cylinder 30, and finally collects in the discharge pipe 32 at the lower middle of the extrusion cylinder 29 for discharge, thus realizing solid-liquid separation. The extrusion cylinder 34 drives the extrusion block 35 to move axially. By adjusting the size of the annular gap between the conical head of the extrusion block 35 and the discharge port at the end of the screen cylinder 30, the resistance to sludge discharge is changed, thereby achieving flexible control over the degree of sludge dewatering and the output.

[0029] It should be noted that the drive motor 19, rotary motor 36, extrusion motor, connecting pump 40, and extrusion cylinder 34 involved in this embodiment of the invention can all be powered by an external power source and connected to the control system to achieve automated operation. The specific circuit connections and control logic of the control system are existing technologies that can be conventionally implemented by those skilled in the art according to actual needs, and therefore are not shown in detail in the accompanying drawings. Meanwhile, all pipe connections mentioned herein are equipped with sealing elements to ensure the sealing and reliability of the equipment operation; the bottoms of the separation tank 2, processing tank 3, and filter tank 4 can be equipped with drain ports and inspection manholes for daily maintenance and cleaning. Furthermore, the start-stop control of the first feed pump 5, the second feed pump 7, and the connecting pump 40 described in this embodiment can be automatically controlled based on a liquid level sensor or a time relay; this is a conventional control method and will not be elaborated upon further.

[0030] Working principle: When this equipment is running, municipal muddy wastewater first enters the filter cartridge 14 inside the separation tank 2 through the feed pipe 18.

[0031] When the drive motor 19 is started, the drive gear 20 drives the connecting gear ring 21 to rotate. The connecting gear ring 21 drives the filter cylinder 14 to rotate stably along the groove on the inner wall of the connecting ring 13 via the slider 15. The spiral blades 16 on the inner wall of the filter cylinder 14 rotate with the filter cylinder 14, conveying and initially separating the incoming muddy wastewater. The liquid in the wastewater flows into the separation tank 2 through the screen in the middle of the outer wall of the filter cylinder 14, while the sludge and solid impurities are trapped inside the filter cylinder 14. Since the filter cylinder 14 is inclined, the trapped sludge moves towards the lowest end of the filter cylinder 14 under the combined action of the spiral blades 16 and gravity, and is finally discharged from the discharge ring 23 at the lowest end. It then falls directly into the collection box 24 directly below by gravity. This inclined sludge discharge structure effectively avoids sludge retention in the filter cylinder 14 and improves the smoothness of sludge discharge.

[0032] To prevent the screen on the outer wall of the filter cartridge 14 from being clogged by sludge and affecting the filtration efficiency, this equipment adopts an intermittent timed control method. The wastewater temporarily stored in the separation tank 2 below the baffle 10 is intermittently drawn by the connected pump 40 and transported to the spray pipe 42 through the output pipe. The outer surface of the filter cartridge 14 is cleaned by high-pressure spraying through the spray nozzle. The residual sludge washed off by the spray, along with a small amount of water, flows down the outer wall of the filter cartridge 14 and is finally discharged into the collection box 24 through the discharge ring 23. This intermittent spray cleaning method not only ensures the cleanliness of the screen of the filter cartridge 14, but also avoids the waste of water resources and excessive dilution of sludge caused by continuous spraying. When deep cleaning or maintenance of the filter cartridge 14 is required, the pull plate 17 can be pulled by the handle to slide the slide bar 12 along the cross bar 11, and the entire sludge discharge mechanism can be pulled out of the separation tank 2 for maintenance.

[0033] The sludge falling into the collection box 24 is transported to the solid-liquid separation mechanism through the sludge conveying pipe 25. The sludge first enters the premixing cylinder 26. The premixing equipment is started, and the premixing motor drives the premixing rod and premixing blades to rotate, which fully mixes the sludge with the flocculant added through the upper part of the premixing cylinder 26 to form flocculent sludge. The uniformly mixed flocculent sludge enters the screen cylinder 30 in the extrusion cylinder 29 through the discharge pipe 28. The extrusion auger 31 rotates under the drive of the extrusion motor, pushing the sludge to one end of the extrusion cylinder 29 and extruding and dewatering it. The extruded liquid flows out through the screen holes of the screen cylinder 30 and is discharged through the drain pipe 32. The dewatered sludge is pushed to the end of the extrusion cylinder 29, and the extrusion cylinder 34 pushes the extrusion block 35 to move to the end. The sludge discharge resistance and the degree of extrusion are controlled by adjusting the gap between the extrusion block 35 and the end of the extrusion cylinder 29. Finally, the sludge cake is discharged and collected from the end.

[0034] The wastewater separated in the separation tank 2 is transported to the treatment tank 3 through the first feed pump 5 and the first feed pipe 6. In the treatment tank 3, the rotary motor 36 drives the stirring rod 37 and the stirring blade 38 to rotate, and the wastewater and flocculant are stirred and mixed to further remove or decompose pollutants. The treated wastewater is transported to the filter tank 4 through the second feed pump 7 and the second feed pipe 8. After being finely filtered by the multi-layer filter screen 39 in the filter tank 4, the clean water is discharged or reused through the liquid outlet pipe 9.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A municipal sewage treatment device, comprising a base plate (1), characterized in that, A separation tank (2) is connected to one side of the upper end of the base plate (1), a processing tank (3) is connected to one side of the separation tank (2), a filter tank (4) is connected to one side of the processing tank (3), and the lower ends of the separation tank (2) and the processing tank (3) are connected to the upper end of the base plate (1). The bottom plate (1) is connected to a liquid delivery mechanism on one side of its upper end. The liquid delivery mechanism delivers the liquid inside the lower part of the separation tank (2) to the processing tank (3) and delivers the liquid inside the lower part of the processing tank (3) to the filter tank (4). The upper part of the inner wall of the separation tank (2) is connected to a sludge discharge mechanism, which includes a partition (10). A crossbar (11) is connected to one side of the separation tank (2) above the partition (10). There are two sets of crossbars (11). A slide bar (12) is slidably connected to one side of each of the two crossbars (11). One side of each slide bar (12) is set in an arc shape. A connecting ring (13) is connected between each of the two slide bars (12). A filter cylinder (14) is rotatably connected between the two connecting rings (13). A discharge ring (23) is connected to one end of the filter cylinder (14). The discharge ring (23) is set in a trumpet shape. The crossbars (11), slide bars (12) and filter cylinder (14) are all set in an inclined position. The upper end of the partition (10) is connected to a water guide ring (22), the lower end of the partition (10) is connected to a collection box (24), the middle part of the lower end of the collection box (24) is connected to a mud conveying pipe (25), and one end of the mud conveying pipe (25) is connected to a solid-liquid separation mechanism.

2. The municipal sewage treatment equipment according to claim 1, characterized in that, The infusion mechanism includes a first feed pump (5), the input end of which extends through into the interior of the separation tank (2), the output end of which is connected to a first feed pipe (6), one end of which extends through into the interior of the processing tank (3), a second feed pump (7) is connected to the upper end of the bottom plate (1) corresponding to the side of the processing tank (3), the input end of which extends through into the interior of the processing tank (3), the output end of which is connected to a second feed pipe (8), one end of which extends through into the interior of the filter tank (4), and an outlet pipe (9) is connected to the lower part of one side of the filter tank (4).

3. The municipal wastewater treatment equipment according to claim 1, characterized in that, The filter cartridge (14) has sliders (15) evenly connected on both sides of its outer wall. The inner walls of the two connecting rings (13) are provided with grooves corresponding to the sliders (15). Several sliders (15) slide inside the two grooves respectively. The cross-sectional shape of the sliders (15) and the cross-sectional shape of the grooves are both inverted T-shaped. The inner wall of the filter cartridge (14) is connected with spiral blades (16).

4. A municipal wastewater treatment device according to claim 1, characterized in that, Two sliding rods (12) are connected to a pull plate (17) at one end. The pull plate (17) is arc-shaped and its overall shape matches the shape of one side of the separator (2). A handle is connected to the lower part of one side of the pull plate (17). A feed pipe (18) is connected to one side of the pull plate (17). One end of the feed pipe (18) passes through the pull plate (17) and the filter cylinder (14) and extends into the interior of the filter cylinder (14). A screen is set in the middle of the outer wall of the filter cylinder (14). A drive mechanism is connected to the upper part of one side of the pull plate (17).

5. A municipal wastewater treatment device according to claim 4, characterized in that, The driving mechanism includes a drive motor (19), and a drive gear (20) is connected to the outer wall of the output end of the drive motor (19). A connecting gear ring (21) is meshed below the drive gear (20). The inside of the connecting gear ring (21) is connected to one side of the outer wall of the filter cartridge (14). A retaining ring is connected to one side of the connecting gear ring (21). The inner wall of the retaining ring is connected to one side of the outer wall of the filter cartridge (14). The retaining ring is used to protect the connecting gear ring (21).

6. A municipal wastewater treatment device according to claim 1, characterized in that, The cross-sectional shape of the water guide ring (22) is inclined. The upper middle part of the partition (10) is open. The upper end of the collection box (24) passes through the partition (10) and the water guide ring (22) in sequence. The upper end of the collection box (24) is funnel-shaped. One end of the mud conveying pipe (25) extends through to one side of the separation tank (2). The shape of one end of the mud conveying pipe (25) is inclined. A connecting pump (40) is connected to one side of the upper end of the water guide ring (22). The input end of the connecting pump (40) is connected to the liquid inlet pipe (41). The lower end of the liquid inlet pipe (41) passes through the water guide ring (22) and the partition (10) in sequence and extends to the lower end of the partition (10). The output end of the connecting pump (40) is connected to the output pipe. The upper end of the output pipe is connected to the water spray pipe (42). A water spray nozzle is connected to one side of the water spray pipe (42).

7. A municipal wastewater treatment device according to claim 1, characterized in that, The solid-liquid separation mechanism includes a premixing cylinder (26), with an inlet pipe (27) connected to one side of the upper end of the premixing cylinder (26) and a discharge pipe (28) connected to the middle of the lower end of the premixing cylinder (26). A discharge valve is connected to the outer wall of the discharge pipe (28). A premixing device is connected inside the premixing cylinder (26), which consists of a premixing motor, a premixing rod, and premixing blades.

8. A municipal wastewater treatment device according to claim 7, characterized in that, The lower end of the feed pipe (28) is connected to an extrusion cylinder (29). A screen cylinder (30) is connected to one side of the inner wall of the extrusion cylinder (29). An extrusion auger (31) is connected to the middle of one side of the extrusion cylinder (29). The extrusion auger (31) is located inside the screen cylinder (30). One end of the extrusion auger (31) is driven by an extrusion motor. One end of the extrusion motor is fixed to one side of the extrusion cylinder (29). A drain pipe (32) is connected to the middle of the lower end of the extrusion cylinder (29). A connecting frame (33) is connected to one end of the extrusion cylinder (29). An extrusion cylinder (34) is connected to one side of the connecting frame (33). The output end of the extrusion cylinder (34) extends through to one side of the connecting frame (33). An extrusion block (35) is connected to one end of the extrusion cylinder (34). The cross-sectional shape of one end of the extrusion block (35) is a conical structure.

9. A municipal wastewater treatment device according to claim 1, characterized in that, A rotary motor (36) is connected to the middle of the upper end of the processing tank (3). The output end of the rotary motor (36) extends through into the interior of the processing tank (3). Stirring rods (37) are connected to both sides of the outer wall of the output end of the rotary motor (36). Stirring blades (38) are connected to the lower end of the output end of the rotary motor (36). Multiple stirring rods (37) and stirring blades (38) are located inside the processing tank (3). Filter screens (39) are evenly connected to the inner wall of the filter tank (4).

Images