Livestock wastewater purification treatment device and method

Abstract

The application discloses a kind of livestock sewage purification treatment device and method, belong to livestock sewage treatment technical field.Device includes bearing support, water inlet bin, clean water bin, compression cylinder, conveying cylinder and spiral auger, filter element is equipped in clean water bin, extrusion assembly is equipped in compression cylinder, bottom is equipped with on-off support assembly;Spiral auger blade is with first water-permeable hole and its pitch decreases from bottom to top, realizes solid-liquid separation and preliminary extrusion dewatering.Method includes water inlet, spiral auger interception conveying extrusion, secondary filtration and backflow, secondary extrusion dewatering and deslagging, clean water discharge, can also regularly backflushing filter element.The application solves the problems of traditional equipment winding and clogging, incomplete solid-liquid separation, realizes sewage purification and solid waste centralized disposal, compact structure, convenient operation, adapts to the demand of livestock farm sewage pretreatment.

Description

Technical Field

[0001] This invention relates to the field of livestock wastewater treatment technology, specifically to a livestock wastewater purification and treatment device and method. Background Technology

[0002] With the rapid development of my country's livestock farming industry towards large-scale and intensive operations, the discharge of livestock wastewater generated during the farming process has shown a significant upward trend. Livestock wastewater has a complex composition, containing not only a large amount of organic pollutants (such as COD and BOD), nitrogen and phosphorus nutrients, but also a large amount of solid pollutants such as manure, residual feed, and straw residue. Among them, the mixed system formed by manure and straw residue, due to the high fiber content of straw residue and the high viscosity of manure, has become a key bottleneck restricting the efficiency of wastewater purification and treatment.

[0003] Currently, livestock wastewater treatment systems generally adopt a conventional process flow of "pretreatment-biological treatment-advanced treatment". The pretreatment unit, as the core link to ensure the stable operation of the subsequent biological treatment system, mainly functions to remove solid pollutants from the wastewater, preventing clogging of subsequent equipment and a decrease in treatment efficiency. Commonly used equipment in the pretreatment stage includes mechanical bar screens, hydraulic screens, and sedimentation tanks: mechanical bar screens intercept large-diameter solid impurities, such as lumpy feces and grass stalks longer than 10mm, through fixed bar spacing (usually 5-10mm); hydraulic screens further separate smaller suspended solids using the impact force of water flow; sedimentation tanks utilize the principle of gravity settling to form a sludge layer at the bottom of the tank, consisting of fecal particles and fine grass debris, which is then discharged from the system through a sludge discharge pipe.

[0004] However, existing pretreatment technologies have significant drawbacks in treating mixed pollutants of feces and straw, and are prone to clogging problems. Firstly, the spacing of mechanical bar screens is difficult to balance "interception effect" and "anti-clogging requirements." If the spacing is reduced to 3-5mm to intercept fine straw, the straw fibers will quickly wrap around the bar screen, forming a dense interception layer. This leads to a sharp decrease in the screen's water flow capacity and may even cause excessive water level differences before and after the screen, resulting in sewage overflow. If a conventional spacing of 5-10mm is maintained, fine straw particles smaller than 5mm will enter the sedimentation tank with the sewage and combine with fecal particles and colloidal substances in the sewage to form a flocculent mixture. This mixture is highly viscous and has poor fluidity. It is not only difficult to settle completely by gravity, but it will also gradually deposit at the bottom of the sedimentation tank, the inner wall of the sludge discharge pipe, and the sludge discharge valve, forming a hard clogging layer. This reduces the flow cross-sectional area of ​​the sludge discharge pipe, and in severe cases, it can even completely block it, preventing the sludge from being discharged from the sedimentation tank.

[0005] Blockage issues can have a chain of negative impacts on livestock wastewater treatment systems: On the one hand, blockages in the sludge discharge pipes lead to a continuous reduction in the effective settling volume of the sedimentation tank, significantly reducing the pretreatment effect. Unremoved straw and manure particles enter subsequent biochemical treatment units (such as anaerobic reactors and aeration tanks), clogging the water distributor pores of the anaerobic reactor and the micropores of the aeration head in the aeration tank. This results in uneven wastewater distribution, disordered aeration bubble distribution, and damage to the microbial living environment, leading to a decrease in the degradation efficiency of organic pollutants and difficulty in meeting effluent quality standards. On the other hand, equipment blockages require frequent shutdowns for disassembly and cleaning, which not only increases labor maintenance costs but also causes intermittent shutdowns of the wastewater treatment system. This results in wastewater stagnation in the equalization tank. If the stagnation exceeds the equalization tank's capacity, it can cause wastewater overflow, resulting in secondary pollution of the surrounding soil and surface water. Furthermore, frequent blockages and cleaning accelerate equipment wear, shortening the service life of core equipment such as bar screens, sieves, and sludge pumps, further increasing the wastewater treatment costs of large-scale livestock farms and hindering the industrial application of livestock wastewater purification technologies. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a livestock wastewater purification and treatment device and method.

[0007] This invention discloses a livestock wastewater purification and treatment device and method, including a support frame, and further comprising:

[0008] The inlet chamber, which is installed on the support frame, is used to receive livestock wastewater to be treated;

[0009] The clean water tank is installed on the support frame and located below the water inlet tank, and is used to hold the purified wastewater; it is equipped with a filter element for secondary filtration of the wastewater.

[0010] A compression cylinder, vertically mounted on a support frame, is used to receive and contain solid contaminants. Inside, there is a compression assembly for secondary compression and dehydration of the solid contaminants. At its bottom, there is a switch support assembly, which provides a support surface for the secondary compression and dehydration of the solid contaminants and enables the switching of the bottom of the compression cylinder to control the orderly discharge of the dehydrated solid contaminants.

[0011] The conveying cylinder is installed at an incline on the support bracket. Its bottom end is connected to the clean water tank, and its top end is connected to the compression cylinder. An inlet is provided on the side wall between the bottom end and the top end, which is connected to the water inlet tank.

[0012] The spiral auger is rotatably mounted inside the conveying cylinder. Its blades have several first water-permeable holes that allow liquid to pass through and intercept solid pollutants. Its pitch gradually decreases from the bottom end to the top end to squeeze and dehydrate the solid pollutants during the conveying process. It is driven by a first driving member to rotate and transport the intercepted solid pollutants upward along the conveying cylinder into the compression cylinder.

[0013] As a further improvement of the present invention, the filter element is a filter screen plate, which is inclinedly fixed inside the water purification chamber. The water purification chamber has a discharge port corresponding to the impurity sliding end of the filter screen plate. A sludge collection chamber is fixedly connected to the outside of the discharge port. The sludge collection chamber is used to collect the impurities filtered out by the filter screen plate.

[0014] As a further improvement of the present invention, the water purification tank is equipped with a backflush assembly. The backflush assembly includes a backflush pipe disposed below the filter screen, a connecting pipe connecting the backflush pipe to the lower part of the water purification tank, and a high-pressure pump disposed on the connecting pipe. The high-pressure pump is used to pump the purified wastewater in the lower part of the water purification tank to the backflush pipe, and the backflush pipe performs backflush on the filter screen.

[0015] As a further improvement of the present invention, a sludge collection bin is fixedly connected to the bottom of the sludge collection bin, and a return water inlet is provided between the bottom of the sludge collection bin and the clean water bin, located below the sludge collection bin; a sludge discharge port is provided on the bottom edge of the sludge collection bin corresponding to the sludge collection bin, and a matching sealing plate is slidably connected to the outside of the sludge discharge port.

[0016] As a further improvement of the present invention, a second water-permeable hole is provided on the bottom side wall of the compression cylinder. The second water-permeable hole is connected to the sludge collection chamber through a guide pipe, which is used to guide the sewage squeezed out by the compression assembly in the compression cylinder to the sludge collection chamber.

[0017] As a further improvement of the present invention, a collection trolley is provided below the on / off support assembly at the bottom of the compression cylinder corresponding to the bearing bracket, and a positioning guide rod adapted to the collection trolley is fixed on the bearing bracket.

[0018] The collection trolley has two collection chambers, which are respectively located at the bottom of the compression cylinder and the drain outlet of the sludge collection chamber, and are used to collect solid pollutants after dehydration and impurities in the sludge collection chamber.

[0019] As a further improvement of the present invention, the extrusion assembly includes an extrusion cylinder and an electric push rod;

[0020] The extrusion cylinder is slidably connected to the compression cylinder, and a push plate is slidably connected to the extrusion cylinder. A pressure sensor is fixedly connected between the push plate and the extrusion cylinder. The electric push rod is fixed to the top surface of the compression cylinder, and the telescopic end of the electric push rod passes through the top of the compression cylinder and is fixedly connected to the push plate.

[0021] As a further improvement of the present invention, the on / off support assembly includes a valve plate, a valve disc, and a second driving member;

[0022] The valve plate is fixed to the bottom end of the compression cylinder. The valve plate is provided with a valve plate that slides against the bottom end of the compression cylinder. The valve plate includes a through hole and a blind hole that are adapted to the bottom end of the compression cylinder. A drive screw is threaded onto the valve plate. The drive screw is connected to a second drive member. The second drive member is fixedly connected to the valve plate and is used to drive the valve plate to slide within the valve plate to switch the on / off state of the bottom end of the compression cylinder.

[0023] This invention discloses a method for purifying and treating livestock wastewater, which is applied to the aforementioned livestock wastewater purification and treatment device, comprising:

[0024] The livestock wastewater to be treated is introduced into the inlet chamber, and then enters the conveying cylinder through the inlet on the side wall of the conveying cylinder;

[0025] Inside the conveying cylinder, a rotating auger intercepts solid pollutants in the wastewater, allowing the liquid to flow downwards through the first permeable hole of the auger into the clean water tank. The intercepted solid pollutants are then conveyed upwards along the inclined conveying cylinder, where they undergo preliminary compression and dehydration during the conveying process.

[0026] The liquid entering the clean water tank undergoes secondary filtration through the filter element. The filtered wastewater remains at the bottom of the clean water tank, while the filtered impurities slide down to the sludge collection tank and are drained. The drained wastewater flows back to the clean water tank through the return water outlet.

[0027] The solid pollutants after initial extrusion and dewatering are transported to the compression cylinder and subjected to secondary extrusion and dewatering by the extrusion assembly. The extruded wastewater is guided to the sludge collection bin, and the solid pollutants after secondary extrusion and dewatering are discharged to the collection trolley.

[0028] The purified wastewater in the water purification tank is discharged through the outlet pipe.

[0029] As a further improvement of the present invention, it also includes: periodically backflushing the filter element through the backflushing assembly, and the impurities after flushing slide down with the sewage into the sludge collection bin for collection.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention constructs an integrated solid-liquid separation and dewatering system. A spiral auger with a first perforation is installed inside an inclined conveying cylinder, and an inlet communicating with the inlet chamber is opened on the side wall of the middle section of the conveying cylinder. This allows for immediate dynamic interception of wastewater upon entry: the liquid flows downwards through the perforation to the clean water chamber under gravity, while solid contaminants are forcibly conveyed upwards to the compression cylinder by the rotation of the spiral auger. This structure replaces fixed grid interception with rotary conveying, completely avoiding the clogging problem caused by fiber entanglement in traditional mechanical grids. Simultaneously, the pitch of the spiral auger gradually decreases along the conveying direction, performing preliminary compression and dewatering of solid contaminants during conveying, significantly reducing the load on subsequent treatment processes.

[0032] This invention achieves efficient water resource recovery and solid waste reduction through the synergistic effect of multi-stage purification and dehydration mechanisms. The filter elements in the purification chamber perform secondary filtration of wastewater, further improving the effluent quality. Impurities trapped by the filter slide into the sludge collection chamber. Combined with the backflushing assembly, the purified wastewater can be used to periodically backflush the filter elements, maintaining their long-term permeability. Solid pollutants entering the compression cylinder are further dehydrated by the extrusion assembly, further reducing their moisture content. The wastewater generated during extrusion flows back to the sludge collection chamber through a guide pipe. The dehydrated, cake-like solid pollutants are then orderly discharged into a collection trolley through a switch-support assembly, achieving classified collection for subsequent resource utilization or centralized disposal.

[0033] Furthermore, the wastewater trap at the bottom of the wastewater collection chamber in this invention drains impurities, and the drained wastewater flows back to the clean water chamber through the return inlet, realizing the recycling of water resources within the device and reducing the amount of wastewater discharged and the need for fresh water replenishment. All functional modules are integrated onto the support frame, resulting in a compact structure and reasonable layout. This design is suitable for installation in newly built farms and also facilitates the upgrading and renovation of existing wastewater treatment facilities, demonstrating promising prospects for industrial application. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a livestock wastewater purification and treatment device disclosed in one embodiment of the present invention;

[0035] Figure 2 This is a partial three-dimensional view of a livestock wastewater purification and treatment device disclosed in an embodiment of the present invention;

[0036] Figure 3 This is a cross-sectional view of the conveyor cylinder of a livestock wastewater purification and treatment device disclosed in one embodiment of the present invention;

[0037] Figure 4 This is a cross-sectional view of the compression cylinder of a livestock wastewater purification and treatment device disclosed in one embodiment of the present invention;

[0038] Figure 5This is a structural diagram of the collection trolley of a livestock wastewater purification and treatment device disclosed in one embodiment of the present invention.

[0039] In the picture:

[0040] 1. Support bracket; 2. Inlet tank; 3. Clean water tank; 4. Conveying cylinder; 5. Compression cylinder; 6. Valve plate; 7. First reducing pipe; 8. Second reducing pipe; 9. Filter screen; 10. Waste outlet; 11. Sludge collection tank; 12. Spiral auger; 13. First motor; 14. First mounting bracket; 15. First water permeable hole; 16. Extrusion cylinder; 17. Push plate; 18. Pressure sensor; 19. Electric push rod; 20. Valve plate; 21. Through hole; 22. Blind hole; 2 3. Drive screw; 24. Second motor; 25. Second mounting bracket; 26. Guide pipe; 27. Second water permeable hole; 28. Backflush pipe; 29. ​​Connecting pipe; 30. High-pressure pump; 31. Trash screen; 32. Return water inlet; 33. Sewage outlet; 34. Sealing plate; 35. Slide groove; 36. Handle groove; 37. Collection trolley; 38. Positioning guide rod; 39. Casters; 40. Push handle; 41. Collection chamber; 42. Controller; 43. Inlet pipe; 44. Outlet pipe. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings:

[0045] like Figure 1-3 As shown, a livestock wastewater purification and treatment device according to the present invention includes a support frame 1, an inlet chamber 2, a purified water chamber 3, a compression cylinder 5, a conveying cylinder 4, and a spiral auger 12. The inlet chamber 2 is mounted on the support frame 1 and is used to receive livestock wastewater to be treated. The purified water chamber 3 is mounted on the support frame 1 and located below the inlet chamber 2, and is used to contain purified wastewater. It contains a filter element for secondary filtration of the wastewater. The compression cylinder 5 is vertically mounted on the support frame 1 and is used to receive and contain solid pollutants. It contains a compression assembly for secondary extrusion and dehydration of the solid pollutants, and its bottom end is provided with a switching support assembly for secondary extrusion and dehydration of the solid pollutants. Water provides a support surface and enables the switching of the bottom end of the compression cylinder 5 to control the orderly discharge of solid pollutants after dehydration. The conveying cylinder 4 is installed at an incline on the support bracket 1, with its bottom end connected to the clean water tank 3 and its top end connected to the compression cylinder 5. An inlet connected to the water inlet tank 2 is opened on the side wall between the bottom and top ends. The spiral auger 12 is rotatably assembled inside the conveying cylinder 4. Several first permeable holes 15 are opened on its blades to allow liquid to pass through and intercept solid pollutants. Its pitch gradually decreases from the bottom end to the top end to squeeze and dehydrate the solid pollutants during the conveying process. It is driven by the first driving member to rotate and transport the intercepted solid pollutants upward along the conveying cylinder 4 into the compression cylinder 5.

[0046] Specifically:

[0047] like Figure 3 As shown, in the above embodiment, preferably, the water inlet on the side wall of the conveying cylinder 4 is connected to the water inlet chamber 2 through the first reducing pipe 7, and the water outlet at the bottom of the conveying cylinder 4 is connected to the clean water chamber 3 through the second reducing pipe 8. The solid pollutant outlet at the top of the conveying cylinder 4 is connected to the compression cylinder 5. In this embodiment, a water inlet pipe 43 is fixedly connected to the water inlet chamber 2, and a water outlet pipe 44 is fixedly connected to the clean water chamber 3.

[0048] In the above embodiment, preferably, the filter element is a filter screen plate 9, which is fixedly inclined inside the water purification tank 3. The water purification tank 3 has a discharge port 10 corresponding to the impurity sliding end of the filter screen plate 9. A sludge collection tank 11 is fixedly connected to the outside of the discharge port 10. The sludge collection tank 11 is used to collect the impurities filtered out by the filter screen plate 9.

[0049] In the above embodiment, preferably, the water purification tank 3 is equipped with a backflushing assembly. The backflushing assembly includes a backflushing pipe 28 disposed below the filter screen 9, a connecting pipe 29 connecting the backflushing pipe 28 to the lower part of the water purification tank 3, and a high-pressure pump 30 disposed on the connecting pipe 29. The high-pressure pump 30 is used to pump the purified wastewater in the lower part of the water purification tank 3 to the backflushing pipe 28, and the backflushing pipe 28 performs backflushing on the filter screen 9.

[0050] In the above embodiment, preferably, a sludge collection tank 11 is fixedly connected to a sludge-blocking mesh plate 31 at its bottom, and a return water inlet 32 ​​is provided between the bottom of the sludge collection tank 11 and the clean water tank 3, located below the sludge-blocking mesh plate 31; a sludge discharge port 33 is provided on the bottom edge of the sludge collection tank 11 corresponding to the sludge-blocking mesh plate 31, and a matching sealing plate 34 is slidably connected to the outside of the sludge discharge port 33; the sludge collection tank 11 is fixedly connected to the upper and lower edges of the sealing plate 34 respectively, and the sealing plate 34 is horizontally slidably connected in the upper and lower grooves 35; a handle groove 36 is also provided on the outside of the sealing plate 34 to facilitate pushing and pulling the sealing plate 34.

[0051] like Figure 4 As shown, in the above embodiment, preferably, a second water-permeable hole 27 is provided on the bottom side wall of the compression cylinder 5. The second water-permeable hole 27 is connected to the sludge collection chamber 11 through the guide pipe 26, and is used to guide the sewage squeezed out by the compression component in the compression cylinder 5 to the sludge collection chamber 11.

[0052] In the above embodiments, preferably, the extrusion assembly includes an extrusion cylinder 16, a push plate 17, a pressure sensor 18, and an electric push rod 19. The extrusion cylinder 16 is slidably connected to the compression cylinder 5, and the push plate 17 is slidably connected to the extrusion cylinder 16. The pressure sensor 18 is fixedly connected between the push plate 17 and the extrusion cylinder 16. The electric push rod 19 is fixed to the top surface of the compression cylinder 5, and the telescopic end of the electric push rod 19 passes through the top of the compression cylinder 5 and is fixedly connected to the push plate 17.

[0053] In the above embodiment, preferably, the on / off support assembly includes a valve plate 6, a valve disc 20, and a second driving member; wherein, the valve plate 6 is fixed to the bottom end of the compression cylinder 5, and the valve plate 6 is provided with a valve disc 20 that slides against the bottom end of the compression cylinder 5. The valve disc 20 includes a through hole portion 21 and a blind hole portion 22 adapted to the bottom end of the compression cylinder 5. A driving screw 23 is threadedly connected to the valve disc 20, and a threaded sleeve for threaded connection of the driving screw 23 is embedded in the valve disc 20. The valve plate 6 is provided with a clearance corresponding to the threaded sleeve. The driving screw 23 is connected to the second driving member, and the second driving member is fixedly connected to the valve plate 6 for driving the valve disc 20 to slide within the valve plate 6 to switch the on / off state of the bottom end of the compression cylinder 5. In this embodiment, the through hole portion 21 is adapted to the bottom end of the compression cylinder 5, and the blind hole portion 22 is adapted to the bottom end of the compression cylinder 5. The blind hole portion 22 can provide a support surface for the extrusion action of the extrusion cylinder 16, that is, provide a support surface for the secondary extrusion dehydration of the solid pollutant.

[0054] In the above embodiment, preferably, the first driving component is a first motor 13, and the shaft end of the auger 12 is fixedly connected to the output shaft of the first motor 13 via a coupling. The first motor 13 is fixedly connected to the end of the conveying cylinder 4 via a first mounting bracket 14. The second driving component is a second motor 24, and the driving screw 23 rotates through the valve plate 6. The driving screw 23 is fixedly connected to the output end of the second motor 24 via a coupling. The second motor 24 is fixedly connected to the valve plate 6 via a second mounting bracket 25.

[0055] like Figure 1 , Figure 5 As shown, in the above embodiment, preferably, a collection trolley 37 is provided below the on / off support assembly at the bottom of the compression cylinder 5 corresponding to the support bracket 1. A positioning guide rod 38 adapted to the collection trolley 37 is fixed on the support bracket 1. The collection trolley 37 has two collection chambers 41, which are respectively provided corresponding to the bottom of the compression cylinder 5 and the drain port 33 of the sludge collection chamber 11, for collecting solid pollutants after dehydration and impurities in the sludge collection chamber 11. In this embodiment, a push handle 40 is fixedly connected to the collection trolley 37, and four casters 39 are installed on the bottom surface of the collection trolley 37.

[0056] In the above embodiment, preferably, the support bracket 1 has a rectangular frame structure. The support bracket has a stopping area for the collection trolley 37 to stop below the on / off support component at the bottom of the compression cylinder 5. The stopping area has a push-in port corresponding to the pushing direction of the collection trolley 37. Positioning guide rods 38 are fixedly connected to both sides of the stopping area corresponding to the collection trolley 37. The positioning guide rods 38 on both sides have an expansion section near the push-in port to guide the collection trolley 37 to be pushed in. The rear section of the positioning guide rods 38 on both sides is adapted to the width of the collection trolley 37 to achieve accurate positioning of the collection trolley 37, so that the two collection chambers 41 of the collection trolley 37 correspond to the bottom of the compression cylinder 5 and the sewage outlet 33 of the sewage collection chamber 11, respectively.

[0057] In the above embodiments, preferably, a controller 42 is also included. The controller 42 is fixedly installed on the support bracket 1 and is electrically connected to the pressure sensor 18, the first motor 13, the second motor 24 and the electric push rod 19.

[0058] A method for purifying and treating livestock wastewater according to the present invention, applied to the aforementioned livestock wastewater purification and treatment device, includes:

[0059] Step 1: Livestock wastewater is pumped to the inlet pipe 43 by a lift pump, enters the inlet chamber 2 through the inlet pipe 43, and then enters the conveying cylinder 4 through the first reducer pipe 7. Inside the conveying cylinder 4, the spiral auger 12 with the first permeable hole 15 intercepts solid pollutants such as feces and straw in the wastewater. The liquid flows downward through the first permeable hole 15 and enters the clean water chamber 3 through the second reducer pipe 8. The liquid entering the clean water chamber 3 is further filtered and purified by the filter screen plate 9. The purified wastewater falls to the bottom of the clean water chamber 3 and is output through the outlet pipe 44.

[0060] Step 2: The first driving component (first motor 13) drives the spiral auger 12 to rotate, conveying the manure and straw residue intercepted in the conveying cylinder 4 upward; the spiral auger 12 with gradually decreasing pitch is used to squeeze the solid pollutants to achieve preliminary dehydration; the manure and straw residue after preliminary dehydration are conveyed into the compression cylinder 5.

[0061] Step 3: The impurities filtered out by the filter screen 9 slide down along its inclined direction and are discharged into the sludge collection bin 11 through the impurity discharge port 10;

[0062] Step 4: Impurities in the sludge collection bin 11 are blocked and drained by the sludge-blocking mesh plate 31. The sewage passing through the sludge-blocking mesh plate 31 flows back to the lower part of the clean water bin 3 through the return water port 32.

[0063] Step 5: The high-pressure pump 30 is started and the purified sewage in the lower part of the water purification tank 3 is extracted through the connecting pipe 29. The filter screen 9 is backwashed through the backflush pipe 28 to wash off the impurities attached to the filter screen 9. The impurities slide into the sludge collection tank 11 with the sewage and are collected.

[0064] Step 6: Push the collection trolley 37 into the support bracket 1. Under the guidance of the positioning guide rod 38, move the collection trolley 37 to the bottom of the on / off support assembly and the sludge collection bin 11, so that the two collection chambers 41 of the collection trolley 37 correspond to the bottom of the compression cylinder 5 and the sludge collection bin 11 respectively.

[0065] Step 7: The controller 42 intermittently controls the electric push rod 19 to move. The electric push rod 19 drives the push plate 17 and the extrusion cylinder 16 downward to perform secondary extrusion and dewatering of the feces and straw in the compression cylinder 5. During the extrusion process, the extrusion cylinder 16 forms a seal on the end of the conveying cylinder 4. The extruded sewage enters the guide pipe 26 through the second water permeable hole 27 on the side wall of the compression cylinder 5, and is then guided into the sludge collection bin 11 through the guide pipe 26. The pressure sensor 18 monitors the extrusion force in real time and feeds back the pressure signal to the controller 42.

[0066] Step 8: When the pressure sensor 18 detects that the pressure has reached the preset value, the controller 42 controls the electric push rod 19 to stop squeezing; the controller 42 starts the second drive unit (second motor 24), the second drive unit drives the drive screw 23 to rotate, so that the valve plate 20 slides in the valve plate 6, and aligns the through hole 21 with the bottom end of the compression cylinder 5; the electric push rod 19 is started again to push out the solid pollutants that have been dehydrated into cakes and fall into the collection chamber 41 corresponding to the collection trolley 37;

[0067] Step 9: Pull the sealing plate 34 through the handle groove 36, so that the sealing plate 34 moves along the sliding groove 35, thereby opening the sewage outlet 33 of the sewage collection bin 11. The impurities in the sewage collection bin 11 slide down along the sewage barrier plate 31 and fall into the collection chamber 41 corresponding to the collection trolley 37 for centralized collection.

[0068] The advantages of this invention are:

[0069] This invention constructs an integrated solid-liquid separation and dehydration system. A spiral auger 12 with a first permeable hole 15 is installed inside an inclined conveying cylinder 4, and an inlet communicating with the inlet chamber 2 is opened on the side wall of the middle section of the conveying cylinder 4. This allows for immediate dynamic interception of wastewater upon entry: the liquid flows downwards through the permeable hole to the clean water chamber 3 under gravity, while solid pollutants are forcibly conveyed upwards to the compression cylinder 5 by the rotation of the spiral auger 12. This structure replaces fixed grid interception with rotary conveying, completely avoiding the clogging problem caused by fiber entanglement in traditional mechanical grids. Simultaneously, the pitch of the spiral auger 12 gradually decreases along the conveying direction, performing preliminary compression and dehydration of solid pollutants during conveying, significantly reducing the load on subsequent treatment.

[0070] This invention achieves efficient water resource recovery and solid waste reduction through the synergistic effect of multi-stage purification and dehydration mechanisms. The filter element installed in the water purification chamber 3 performs secondary filtration of wastewater, further improving the effluent quality. Impurities trapped by the filter slide into the sludge collection chamber 11. With the backflushing flushing assembly, the purified wastewater can be used to periodically backflush the filter element, maintaining its long-term permeability. Solid pollutants entering the compression cylinder 5 are subjected to secondary compression and dehydration by the extrusion assembly, further reducing the moisture content. The wastewater generated during extrusion flows back to the sludge collection chamber 11 through the guide pipe 26. The solid pollutants, after being dehydrated and formed into cakes, are orderly discharged to the collection trolley 37 through the on / off support assembly, achieving classified collection and facilitating subsequent resource utilization or centralized disposal.

[0071] Furthermore, the wastewater trap 31 at the bottom of the wastewater collection chamber 11 drains impurities, and the drained wastewater flows back to the clean water chamber 3 through the return water inlet 32, realizing the recycling of water resources within the device and reducing the amount of wastewater discharged and the need for fresh water replenishment. All functional modules are integrated onto the support frame 1, resulting in a compact structure and reasonable layout. This design is suitable for installation in newly built farms and also facilitates the upgrading and renovation of existing wastewater treatment facilities, demonstrating promising prospects for industrial application.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A livestock wastewater purification and treatment device, comprising a support frame, characterized in that, Also includes: The inlet chamber, which is installed on the support frame, is used to receive livestock wastewater to be treated; A clean water tank, which is installed on a support frame and located below the water inlet tank, is used to hold the purified wastewater; It is equipped with a filter element that performs secondary filtration of sewage. A compression cylinder, vertically mounted on a support frame, is used to receive and contain solid contaminants; It is equipped with an extrusion assembly for secondary extrusion and dehydration of solid pollutants, and a switch support assembly is provided at its bottom. The switch support assembly is used to provide a support surface for secondary extrusion and dehydration of solid pollutants and realize the switching of the bottom of the compression cylinder to control the orderly discharge of solid pollutants after dehydration. The switch support assembly includes a valve plate, a valve disc and a second driving component. The valve plate is fixed to the bottom end of the compression cylinder. The valve plate contains a valve disc that slides and fits against the bottom end of the compression cylinder. The valve disc includes a through hole and a blind hole adapted to the bottom end of the compression cylinder. A drive screw is threaded onto the valve disc, and the drive screw is connected to a second drive component. The second drive component is fixedly connected to the valve plate and is used to drive the valve disc to slide within the valve plate to switch the on / off state of the bottom end of the compression cylinder. The blind hole provides a support surface for the extrusion action of the compression cylinder. The conveying cylinder is installed at an incline on the support bracket. Its bottom end is connected to the clean water tank, and its top end is connected to the compression cylinder. An inlet is provided on the side wall between the bottom end and the top end, which is connected to the water inlet tank. A spiral auger, which is rotatably assembled inside the conveying cylinder, has several first water-permeable holes on its blades that allow liquid to pass through and intercept solid pollutants. Its pitch gradually decreases from the bottom end to the top end in order to squeeze and dehydrate solid contaminants during the conveying process; Driven by the first driving component, it rotates and transports the intercepted solid pollutants upward along the conveying cylinder into the compression cylinder.

2. The livestock wastewater purification and treatment device according to claim 1, characterized in that, The filter element is a filter screen plate, which is fixedly and inclined inside the water purification chamber. The water purification chamber has a discharge port corresponding to the impurity sliding end of the filter screen plate. A sludge collection chamber is fixedly connected to the outside of the discharge port. The sludge collection chamber is used to collect the impurities filtered out by the filter screen plate.

3. The livestock wastewater purification and treatment device according to claim 2, characterized in that, The purified water tank is equipped with a backflushing assembly, which includes a backflushing pipe located below the filter screen, a connecting pipe connecting the backflushing pipe to the lower part of the purified water tank, and a high-pressure pump located on the connecting pipe. The high-pressure pump is used to pump the purified wastewater from the lower part of the purified water tank to the backflushing pipe, and the backflushing pipe performs backflushing on the filter screen.

4. The livestock wastewater purification and treatment device according to claim 2, characterized in that, The bottom of the sludge collection chamber is fixedly connected to a sludge-blocking mesh plate, and a return water outlet is provided between the bottom of the sludge collection chamber and the clean water chamber located below the sludge-blocking mesh plate; the sludge collection chamber has a sewage outlet corresponding to the bottom edge of the sludge-blocking mesh plate, and a matching sealing plate is slidably connected to the outside of the sewage outlet.

5. The livestock wastewater purification and treatment device according to claim 2, characterized in that, The bottom side wall of the compression cylinder is provided with a second water permeable hole, which is connected to the sludge collection chamber through a guide pipe, and is used to guide the sewage squeezed out by the compression assembly in the compression cylinder to the sludge collection chamber.

6. The livestock wastewater purification and treatment device according to claim 2, characterized in that, The support bracket is provided with a collection trolley below the on / off support assembly at the bottom of the compression cylinder, and a positioning guide rod adapted to the collection trolley is fixed on the support bracket. The collection trolley has two collection chambers, which are respectively located at the bottom of the compression cylinder and the drain outlet of the sludge collection chamber, and are used to collect solid pollutants after dehydration and impurities in the sludge collection chamber.

7. The livestock wastewater purification and treatment device according to claim 1, characterized in that, The extrusion assembly includes an extrusion cylinder and an electric push rod; The extrusion cylinder is slidably connected to the compression cylinder, and a push plate is slidably connected to the extrusion cylinder. A pressure sensor is fixedly connected between the push plate and the extrusion cylinder. The electric push rod is fixed to the top surface of the compression cylinder, and the telescopic end of the electric push rod passes through the top of the compression cylinder and is fixedly connected to the push plate.

8. A method for purifying and treating livestock wastewater, applied to the livestock wastewater purification and treatment device according to any one of claims 1-7, characterized in that, include: The livestock wastewater to be treated is introduced into the inlet chamber, and then enters the conveying cylinder through the inlet on the side wall of the conveying cylinder; Inside the conveying cylinder, a rotating auger intercepts solid pollutants in the wastewater, allowing the liquid to flow downwards through the first permeable hole of the auger into the clean water tank. The intercepted solid pollutants are then conveyed upwards along the inclined conveying cylinder, where they undergo preliminary compression and dehydration during the conveying process. The liquid entering the clean water tank undergoes secondary filtration through the filter element. The filtered wastewater remains at the bottom of the clean water tank, while the filtered impurities slide down to the sludge collection tank and are drained. The drained wastewater flows back to the clean water tank through the return water outlet. The solid pollutants after initial extrusion and dewatering are transported to the compression cylinder and subjected to secondary extrusion and dewatering by the extrusion assembly. The extruded wastewater is guided to the sludge collection bin, and the solid pollutants after secondary extrusion and dewatering are discharged to the collection trolley. The purified wastewater in the water purification tank is discharged through the outlet pipe.

9. The method for purifying and treating livestock wastewater according to claim 8, characterized in that, Also includes: The filter element is backwashed periodically using the backflush assembly, and the impurities after rinsing slide down with the wastewater into the sludge collection chamber for collection.

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