Recycling system for wastewater in production of environment-friendly recycled boxboard paper

Abstract

The application discloses a recycling system for wastewater in the production of recycled environmental protection box board paper, and relates to the technical field of wastewater treatment.The recycling system comprises a base, a grading filtration unit is arranged on the top surface of the base and is used for removing most solid impurities in the wastewater by cooperation of filtration and extrusion, an end treatment unit is arranged at the output end of the grading filtration unit and is used for further removing fine impurities in the wastewater, and the grading filtration unit comprises an extrusion residue discharge seat which is fixedly installed on the top surface of the base and is used for discharging extrusion residues.The application can intercept large-diameter solid impurities in the wastewater by means of an inverted quadrangular prism rough filtration unit, remove fine-particle impurities through a columnar fine filtration unit, realize step-by-step efficient separation of solid-phase pollutants with different particle sizes in the wastewater, complete the pre-purification treatment of the wastewater, greatly reduce the pollutant load for the downstream deep treatment process, improve the filtration efficiency and delay the clogging of filter materials through the structural flow guide design, and guarantee the continuous and stable operation of the filtration process.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater recycling system for the production of recycled environmentally friendly corrugated cardboard. Background Technology

[0002] The production of recycled environmentally friendly corrugated paperboard generates a large amount of wastewater containing numerous pollutants. Direct discharge of this wastewater would pollute water bodies and soil. Therefore, a wastewater recycling system is needed to treat it. This system can recycle and reuse the production wastewater, significantly saving water resources and alleviating the water pressure on the paper industry. At the same time, it can also reduce pollutant emissions and lessen the environmental burden by purifying the wastewater.

[0003] The relevant patent CN113617084A can be referenced. Essentially, it consists of a water filtration system, a material storage system, a compression system, and a liquid storage tank. The water filtration system includes a water filter tank and a water filter plate. A drive component drives a scraper to clean paper scraps from the water filter plate. The material storage system includes a material storage tank and a first partition plate, which are used to store precipitated paper scraps and drain water. The compression system includes a compression box and a hydraulic press, which compresses the paper scraps into shape.

[0004] Currently, wastewater treatment in corrugated paper production mostly uses simple filtration methods, which are ineffective in handling the paper scraps produced after filtration, consume a lot of manpower, and make it difficult to achieve wastewater recycling. Such treatment methods have inconveniences such as paper scraps easily clogging filter components, low treatment efficiency, high labor costs, and waste of water resources.

[0005] Therefore, improvements should be made by designing a device that integrates filtration, storage, and compression functions, with a reasonable structural design and process flow, to achieve efficient wastewater filtration, proper paper scrap treatment, and water resource recycling. This involves using a tiered filtration unit to achieve efficient separation of impurities of different particle sizes, and employing a dual-extrusion head synergistic online extrusion dewatering and slag discharge structure to solve the problems of easy filter clogging and poor operational continuity. Simultaneously, a reverse air flotation and centrifugal filtration structure is used to achieve both deep removal of fine suspended impurities and liquid-phase defoaming treatment, thus realizing deep purification of industrial wastewater and water resource recycling. To this end, we provide a wastewater recycling system for recycled environmentally friendly corrugated board production to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a wastewater recycling system for the production of recycled and environmentally friendly corrugated board, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A wastewater recycling system for recycled environmentally friendly corrugated board production includes a base. The top surface of the base is equipped with a graded filtration unit that uses a combination of filtration and extrusion to remove most of the solid impurities in the wastewater. The output end of the graded filtration unit is equipped with an end-of-line treatment unit that can further remove fine impurities from the wastewater.

[0009] The graded filtration unit includes a slag discharge seat fixedly installed on the top surface of the base for discharging slag, a primary filtration chamber set on the top surface of the slag discharge seat for multiple filtrations of the liquid, and a flow guide hood set inside the top surface of the slag discharge seat for slag filtration of the liquid.

[0010] The end-of-line treatment unit includes an air flotation chamber located at the output end of the primary filtration chamber for further filtration of fine impurities in the filtered wastewater, and a collection chamber located at the output end of the air flotation chamber for further filtration and elimination of air bubbles in the liquid.

[0011] A further improvement of the technical solution of the present invention is that: an inclined coarse filter screen is fixedly connected inside the top surface of the preliminary filtration chamber, a flow guide block is fixedly connected inside the preliminary filtration chamber, an inlet pipe is fixedly connected to the top surface of the flow guide block, and the inlet pipe is interconnected with the flow guide cover.

[0012] A further improvement of the technical solution of the present invention is that: a liquid storage chamber is fixedly connected to the bottom surface of the preliminary filtration chamber, a columnar filter screen is fixedly connected to the middle of the liquid storage chamber, the columnar filter screen is connected to the liquid inlet pipe, and a manifold is fixedly connected to the output end of the liquid storage chamber.

[0013] A further improvement of the technical solution of the present invention is that: a hydraulic rod is fixedly connected to the inner top surface of the flow guide shroud, a sealing baffle is fixedly connected to the output end of the hydraulic rod, a squeezing head is fixedly connected to the bottom surface of the sealing baffle, and the sealing baffle is slidably connected inside the liquid inlet pipe and the columnar filter screen.

[0014] A further improvement of the technical solution of the present invention is that: a hydraulic push rod is fixedly connected inside the extrusion slag discharge seat, a bottom sealing plate is fixedly connected to the output end of the hydraulic push rod, a slag discharge chamber is fixedly connected to the top surface of the extrusion slag discharge seat, and the slag discharge chamber is fixedly connected to the bottom surface of the liquid storage chamber.

[0015] A further improvement of the technical solution of the present invention is that: the columnar filter screen is interconnected with the slag discharge chamber, a bottom squeezing head is fixedly connected to the top surface of the bottom sealing plate, the bottom sealing plate is tightly attached to the bottom surface of the liquid storage chamber, and the bottom squeezing head is movably connected to the inside of the bottom surface of the columnar filter screen.

[0016] A further improvement of the technical solution of the present invention is that: a liquid inlet is provided at the top side of the air flotation chamber, a liquid outlet is provided at the bottom side of the air flotation chamber, a slag discharge water pump is fixedly connected to the top surface of the air flotation chamber, an air jet is fixedly connected to the bottom surface of the air flotation chamber, an air pump is fixedly connected to the bottom surface of the air flotation chamber, and the air jet is fixedly connected to the output end of the air pump.

[0017] A further improvement of the technical solution of the present invention is that: a bracket is fixedly connected to the outer surface of the collection chamber, a drive motor is fixedly connected to the top surface of the collection chamber, a centrifuge chamber is fixedly connected to the inside of the collection chamber, a tight filter screen is fixedly connected to the inner side of the centrifuge chamber, the input end of the centrifuge chamber is fixedly connected to the inside of the liquid outlet, and a sealing water valve is fixedly connected to the output end of the collection chamber.

[0018] A further improvement of the technical solution of the present invention is that: a flow-deflecting plate is rotatably connected inside the centrifuge chamber, and one end of the flow-deflecting plate penetrates the top surface of the collection chamber and is fixedly connected to the output end of the drive motor.

[0019] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0020] 1. This invention provides a wastewater recycling system for recycled environmentally friendly corrugated board production. It uses an inverted truncated quadrangular coarse filter unit to trap large-particle solid impurities in the wastewater, and then a columnar fine filter unit to remove fine-particle impurities. This achieves efficient separation of solid pollutants of different particle sizes in the wastewater, completing the pre-purification treatment of the wastewater. This significantly reduces the pollutant load for downstream deep treatment processes. At the same time, the structural flow-guiding design improves filtration efficiency, delays filter media clogging, and ensures the continuous and stable operation of the filtration process.

[0021] 2. This invention provides a wastewater recycling system for recycled environmentally friendly corrugated board production. Through an integrated structure of upper sealing and plugging, upper and lower double extrusion heads working together to pressurize, and bottom adaptive retraction for slag discharge, the filter residue trapped by the filter screen is dehydrated under high pressure and deeply separated into solid and liquid without disassembling or stopping the machine. After dehydration, the dry residue is automatically discharged by gravity and automatically resets and circulates after completion, fundamentally solving the problems of easy clogging of the filter screen, high moisture content of the filter residue, and poor stability of continuous operation.

[0022] 3. This invention provides a wastewater recycling system for recycled environmentally friendly corrugated board production. By utilizing high-pressure microbubbles flowing in reverse, fine suspended impurities in the liquid phase are adsorbed and floated to the surface for separation, achieving deep impurity removal. Then, the liquid phase is driven by a centrifugal force field to penetrate a precision filter screen, achieving terminal filtration of residual fine impurities. At the same time, the collision and shearing action between the liquid phase and the filter screen eliminates microbubbles remaining from the air flotation process. Ultimately, the purified liquid phase meets the standards for subsequent chemical treatment and recycling, balancing purification effect and feasibility of subsequent reuse. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the graded filtration unit of the present invention;

[0025] Figure 3 For the present invention Figure 2 Preliminary cross-sectional view of the filter chamber;

[0026] Figure 4 For the present invention Figure 2 Schematic diagram of the extrusion head structure;

[0027] Figure 5 For the present invention Figure 2 Cross-sectional view of the slag discharge seat in the middle of the extrusion process;

[0028] Figure 6 This is a schematic diagram of the end-processing unit of the present invention;

[0029] Figure 7 For the present invention Figure 6 Cross-sectional view of a floating gas tank;

[0030] Figure 8 For the present invention Figure 6 Schematic diagram of the central collection bin structure;

[0031] Figure 9 For the present invention Figure 8 Cross-sectional view of the centrifuge chamber.

[0032] In the diagram: 1. Base; 2. Staged filtration unit; 21. Slag discharge seat; 22. Preliminary filtration chamber; 23. Flow guide hood; 24. Inclined coarse filter screen; 25. Flow guide block; 26. Columnar filter screen; 27. Liquid inlet pipe; 28. Liquid storage chamber; 29. ​​Flow guide pipe; 210. Hydraulic rod; 211. Sealing baffle; 212. Squeezing head; 213. Hydraulic push rod; 214. Slag discharge chamber; 215. Bottom sealing plate; 216. Bottom squeezing head; 3. End-of-line treatment unit; 31. Support; 32. Collection chamber; 33. Air flotation chamber; 34. Liquid outlet; 35. Liquid inlet; 36. Slag discharge water pump; 37. Jet nozzle; 38. Air pump; 39. Tight filter screen; 310. Centrifuge chamber; 311. Sealing water valve; 312. Flow deflector plate. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to embodiments:

[0034] Example 1: As Figure 1-9As shown, the present invention provides a wastewater recycling system for the production of recycled environmentally friendly corrugated board, including a base 1. The top surface of the base 1 is provided with a graded filtration unit 2 that removes most of the solid impurities in the wastewater by combining filtration and extrusion. The output end of the graded filtration unit 2 is provided with an end treatment unit 3 that can further remove fine impurities in the wastewater. The graded filtration unit 2 includes an extrusion slag discharge seat 21 fixedly installed on the top surface of the base 1 for discharging extrusion slag, a preliminary filtration chamber 22 disposed on the top surface of the extrusion slag discharge seat 21 for multiple filtration of the liquid, and a flow guide hood 23 disposed inside the top surface of the extrusion slag discharge seat 21 for extrusion filtration of the liquid.

[0035] The inclined coarse filter screen 24 has an overall inverted quadrangular frustum structure. The flow guide hood 23 is fixed inside the inclined coarse filter screen 24. The four sides of the flow guide hood 23 are flow guiding working surfaces, used to guide the liquid flow to the inclined coarse filter screen 24, so as to achieve the primary separation of the liquid phase to be treated from large-particle solid impurities. The primary filtration chamber 22 has a built-in flow guide block 25, which can guide and gather the liquid phase after primary filtration to the inlet end of the liquid inlet pipe 27.

[0036] An inclined coarse filter screen 24 is fixedly connected to the top surface of the primary filtration chamber 22. A flow guide block 25 is fixedly connected to the inside of the primary filtration chamber 22. An inlet pipe 27 is fixedly connected to the top surface of the flow guide block 25. The inlet pipe 27 is connected to the flow guide hood 23. A liquid storage chamber 28 is fixedly connected to the bottom surface of the primary filtration chamber 22. A columnar filter screen 26 is fixedly connected to the middle of the inside of the liquid storage chamber 28. The columnar filter screen 26 is connected to the inlet pipe 27. A flow guide pipe 29 is fixedly connected to the output end of the liquid storage chamber 28.

[0037] The inlet pipe 27 is coaxially connected to the columnar filter screen 26, and the inner diameters of the two are the same. The two ends of the inner cavity of the liquid storage tank 28 are equipped with guide plates to regulate the liquid flow field and avoid liquid accumulation in dead zones. The manifold pipe 29 is fixed to the lowest point of the inner cavity of the liquid storage tank 28 to ensure that the filtered liquid phase can flow completely into its interior. The bottom of the columnar filter screen 26 is open, and the open end penetrates the bottom plate of the liquid storage tank 28.

[0038] In this embodiment, the waste liquid to be treated enters the device through the top opening of the inclined coarse filter 24. Under the combined action of the guiding effect of the flow guide hood 23 and the wall guiding effect of the inverted quadrangular truncated inclined coarse filter 24, large-particle solid impurities in the waste liquid are intercepted by the inclined coarse filter 24. After primary filtration, the waste liquid carrying the remaining fine-particle impurities flows into the inner cavity of the preliminary filtration chamber 22. After being guided and rectified by the flow guide block 25, it enters the inner cavity of the inlet pipe 27 and the columnar filter 26 in sequence. After secondary filtration by the columnar filter 26, the purified liquid phase is collected in the storage tank 28 and finally transported to the downstream treatment unit through the flow guide pipe 29.

[0039] Example 2: As Figure 1-9As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, a hydraulic rod 210 is fixedly connected to the inner top surface of the flow guide hood 23, a sealing baffle 211 is fixedly connected to the output end of the hydraulic rod 210, a squeezing head 212 is fixedly connected to the bottom surface of the sealing baffle 211, the sealing baffle 211 is slidably connected to the inside of the liquid inlet pipe 27 and the columnar filter screen 26, a hydraulic push rod 213 is fixedly connected to the inside of the squeezing slag discharge seat 21, a bottom sealing plate 215 is fixedly connected to the output end of the hydraulic push rod 213, a slag discharge chamber 214 is fixedly connected to the top surface of the squeezing slag discharge seat 21, the slag discharge chamber 214 is fixedly connected to the bottom surface of the liquid storage chamber 28, the columnar filter screen 26 and the slag discharge chamber 214 are interconnected, a bottom squeezing head 216 is fixedly connected to the top surface of the bottom sealing plate 215, the bottom sealing plate 215 is tightly attached to the bottom surface of the liquid storage chamber 28, and the bottom squeezing head 216 is movably connected to the inside of the bottom surface of the columnar filter screen 26;

[0040] The flow guide shroud 23 has a built-in hydraulic rod 210, which can drive the sealing baffle 211 and the extrusion head 212 to reciprocate linearly along the axial direction. The outer diameter of the sealing baffle 211 and the extrusion head 212 is consistent with the flow inner diameter of the liquid inlet pipe 27 and the columnar filter screen 26, which can achieve dynamic sealing fit with the pipe wall and the inner wall of the filter screen. A sealing sleeve is provided on the bottom plate of the liquid storage tank 28 at the position corresponding to the outlet end of the columnar filter screen 26. The axial height of the sealing sleeve is higher than the maximum downward stroke of the extrusion head 212 to ensure the sealing effectiveness under the extrusion condition.

[0041] The extrusion slag discharge seat 21 provides the foundation bearing and installation support for the device. The extrusion slag discharge seat 21 has a built-in hydraulic push rod 213, whose rated output thrust is greater than the output thrust of the hydraulic rod 210. Under the filtration condition, the bottom sealing plate 215 is tightly attached to the bottom open end of the columnar filter screen 26 under the drive of the hydraulic push rod 213, ensuring that the liquid storage chamber 28 is in a sealed state. The bottom sealing plate 215 is coaxially fixed to the bottom extrusion head 216 on the side facing the columnar filter screen 26. Its outer diameter is the same as that of the extrusion head 212, and the extrusion working surfaces of the two are set opposite each other. When the bottom extrusion head 216 descends to the lower end of the stroke, its top surface is flush with the guide slope of the slag discharge chamber 214.

[0042] In this embodiment, when the filter residue trapped in the inner cavity of the columnar filter screen 26 accumulates to a set amount, the hydraulic rod 210 drives the sealing baffle 211 and the extrusion head 212 to move axially downward. When the sealing baffle 211 moves to the set position, it completely seals the outlet end of the liquid inlet pipe 27, so that the liquid to be treated in the preliminary filtration chamber 22 is temporarily stored and isolated, and the liquid is stopped from entering the columnar filter screen 26. Simultaneously, the extrusion head 212 and the bottom extrusion head 216 form a closed extrusion chamber to extrude and dehydrate the filter residue and residual liquid in the inner cavity of the columnar filter screen 26. With the filtration effect of the columnar filter screen 26, the residual liquid and solid filter residue are deeply separated. The separated liquid phase flows into the storage chamber 28. As the extrusion head 212 continues to move downward, the hydraulic push rod 213 simultaneously performs adaptive retraction to ensure that the extrusion head 212 and the bottom extrusion head 216 always maintain a constant extrusion pressure on the filter residue.

[0043] When the sealing baffle 211 descends to the top inlet of the completely enclosed columnar filter screen 26, the extrusion head 212 reaches the stroke end point and remains locked in position. Then, the hydraulic push rod 213 drives the bottom extrusion head 216 to continue descending to the bottom stroke end point. At this time, the top surface of the bottom extrusion head 216 is flush with the guide slope of the slag discharge bin 214. The dehydrated and dried filter residue in the columnar filter screen 26 slides down the slope of the slag discharge bin 214 under the action of gravity and goes outside the device. After the slag discharge is completed, the bottom extrusion head 216 and the extrusion head 212 complete the extrusion cooperation according to the set time sequence and then reset themselves, so that the graded filtration unit 2 returns to the initial filtration state and can enter the next working cycle.

[0044] Example 3: As Figure 1-9 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the end-of-line treatment unit 3 includes an air flotation chamber 33 disposed at the output end of the preliminary filtration chamber 22 for further filtration of fine impurities in the filtered wastewater, and a collection chamber 32 disposed at the output end of the air flotation chamber 33 for further filtration and elimination of air bubbles in the liquid. The top side of the air flotation chamber 33 is provided with an inlet 35, and the bottom side of the air flotation chamber 33 is provided with an outlet 34. A sludge discharge pump 36 is fixedly connected to the top surface of the air flotation chamber 33, an air jet nozzle 37 is fixedly connected to the bottom surface of the air flotation chamber 33, and an air pump 38 is fixedly connected to the bottom surface of the air flotation chamber 33. The air jet nozzle 37 is fixedly connected to the output end of the air pump 38.

[0045] A bracket 31 is fixedly connected to the outer surface of the collection chamber 32, a drive motor is fixedly connected to the top surface of the collection chamber 32, a centrifuge chamber 310 is fixedly connected inside the collection chamber 32, a tight filter screen 39 is fixedly connected to the inner side of the centrifuge chamber 310, the input end of the centrifuge chamber 310 is fixedly connected to the inside of the liquid outlet 34, a sealing water valve 311 is fixedly connected to the output end of the collection chamber 32, and a flow-deflecting plate 312 is rotatably connected inside the centrifuge chamber 310. One end of the flow-deflecting plate 312 penetrates the top surface of the collection chamber 32 and is fixedly connected to the output end of the drive motor.

[0046] The air flotation chamber 33 has an inlet 35 and an outlet 34 at both ends for continuous liquid transport. The bottom plate of the air flotation chamber 33 is evenly distributed with jet nozzles 37 of the same diameter. The jet direction of the jet nozzles 37 is opposite to the mainstream direction of the liquid phase in the chamber, forming a countercurrent gas-liquid two-phase flow. The top of the inner cavity of the air flotation chamber 33 is provided with a funnel-shaped slag collection and guiding structure. The slag discharge pump 36 is installed at the top outlet of the funnel-shaped guiding structure. The tight filter screen 39 is fixed to the top of the inner cavity of the collection chamber 32. The centrifugal chamber 310 formed by the tight filter screen 39 is provided with a flow-deflecting plate 312. The flow-deflecting plate 312 is connected to the drive motor and can rotate at high speed under the drive of the motor, causing the liquid phase in the chamber to perform centrifugal rotation.

[0047] In this embodiment, the liquid phase after pre-filtration is sent into the inner cavity of the flotation chamber 33 through the inlet 35. While the liquid phase flows steadily along the chamber, the air pump 38 sprays high-pressure microbubbles evenly into the flotation chamber 33 through the jet nozzle 37. The counter-flowing microbubbles fully collide and adsorb with the suspended impurities in the liquid phase, forming flotation flocs that float to the top of the flotation chamber 33. After being collected by the funnel-shaped slag collection and guiding structure, the slag and part of the carrier liquid are discharged out of the device by the slag discharge pump 36, thus completing the deep purification of the liquid phase by flotation.

[0048] The liquid phase after air flotation is further transported to the centrifuge chamber 310. The drive motor drives the agitator plate 312 to rotate at high speed, driving the liquid phase to undergo forced centrifugal motion in the centrifuge chamber 310. Under the action of centrifugal force field, the liquid phase quickly penetrates through the dense filter screen 39 and is collected in the collection chamber 32. During the process of the liquid phase passing through the filter screen, the collision and shearing action with the dense filter screen 39 not only achieves terminal filtration of residual fine suspended impurities, but also effectively disperses the residual microbubbles in the liquid phase, eliminating the bubble effect caused by the air flotation process. Finally, the liquid phase that has completed the entire purification process is collected in the collection chamber 32. After subsequent chemical treatment, the water resources can be recycled and reused.

[0049] The working principle of this wastewater recycling system for recycled and environmentally friendly corrugated cardboard production will be explained in detail below.

[0050] like Figure 1-9 As shown, by entering the waste liquid to be treated into the inverted truncated quadrangular inclined coarse filter screen 24, under the guiding action of the flow guide hood 23, large-particle solid impurities in the waste liquid are intercepted by the coarse filter screen 24, completing the primary solid-liquid separation; after the filtered waste liquid is guided and rectified by the flow guide block 25 in the primary filtration chamber 22, it is sent into the inner cavity of the columnar filter screen 26 through the liquid inlet pipe 27, and the columnar filter screen 26 completes the secondary precision filtration. The purified liquid phase flows into the liquid storage chamber 28 and is transported to the downstream treatment unit through the flow guide pipe 29.

[0051] When the filter residue in the columnar filter screen 26 accumulates to a set amount, the hydraulic rod 210 drives the sealing baffle 211 and the extrusion head 212 to move axially downwards. The sealing baffle 211 closes the outlet of the liquid inlet pipe 27, achieving temporary storage and isolation of the liquid to be treated and stopping the feeding. Simultaneously, the extrusion head 212 and the bottom extrusion head 216 form a closed extrusion chamber to extrude and dehydrate the filter residue and residual liquid. This, combined with the columnar filter screen 26, achieves deep separation of the residual liquid and solid filter residue. The separated liquid phase flows into the storage tank 28. During the extrusion process, the hydraulic push rod 210... 13. The extrusion head 212 continuously descends and synchronously retracts, ensuring that the dual extrusion heads always maintain a constant extrusion pressure on the filter residue. When the sealing baffle 211 completely seals the top inlet of the columnar filter screen 26 and the extrusion head 212 reaches the stroke end point and locks, the bottom extrusion head 216 descends to be flush with the guide slope of the slag discharge bin 214, and the dewatered and dried filter residue slides down the slope and is discharged under the action of gravity. After the slag discharge is completed, each component resets according to the set sequence, the grading filtration unit returns to the initial state, and can enter the next working cycle.

[0052] After being filtered, the liquid phase is sent into the flotation chamber 33. While the liquid phase flows steadily along the chamber, the air pump 38 sprays high-pressure microbubbles into the chamber through the air jets 37 evenly distributed at the bottom of the chamber. The counter-flowing microbubbles collide and adsorb with the suspended impurities in the liquid phase, forming flotation flocs that float to the top of the chamber. After being collected by the funnel-shaped slag collection and guiding structure, the slag and part of the carrier liquid are discharged by the slag discharge pump 36, completing the deep purification of the liquid phase.

[0053] After being treated by air flotation, the liquid phase is transported to the centrifuge chamber 310. The drive motor drives the agitator plate 312 to rotate at high speed, driving the liquid phase to undergo forced centrifugal motion. Under the action of the centrifugal force field, the liquid phase quickly penetrates the tight filter screen 39, completing the terminal filtration of residual fine suspended impurities. The purified liquid phase is collected in the collection chamber 32. During the process of the liquid phase passing through the filter screen, the collision and shearing action with the filter screen simultaneously disperses the residual microbubbles in the liquid phase, eliminating the influence of bubbles brought about by the air flotation process. Finally, the liquid phase that has completed the entire purification process is collected in the collection chamber 32 and can be recycled after subsequent chemical treatment.

[0054] In summary, the combined structure of inverted truncated quadrangular coarse filtration and columnar fine filtration in this paper achieves efficient stepwise separation of impurities of different particle sizes in wastewater. By utilizing the online extrusion dewatering and slag discharge structure with dual extrusion heads, the pain points of traditional filtration devices, such as easy clogging of filter screens and poor continuous operation, are solved. At the same time, the structure of reverse air flotation and centrifugal filtration is adopted to take into account the deep removal of fine suspended impurities and liquid phase defoaming treatment, so as to achieve deep purification of industrial wastewater and water resource recycling.

[0055] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A wastewater recycling system for recycled environmentally friendly corrugated board production, comprising a base (1), characterized in that: The top surface of the base (1) is provided with a graded filtration unit (2) that uses a combination of filtration and compression to remove most of the solid impurities in the wastewater. The output end of the graded filtration unit (2) is provided with an end treatment unit (3) that further removes fine impurities from the wastewater. The graded filtration unit (2) includes a slag discharge seat (21) fixedly installed on the top surface of the base (1) for discharging slag, a primary filtration chamber (22) set on the top surface of the slag discharge seat (21) for filtering the liquid multiple times, and a flow guide (23) set inside the top surface of the slag discharge seat (21) for slag filtration. The end-of-line treatment unit (3) includes an air flotation chamber (33) set at the output end of the primary filtration chamber (22) for further filtration of fine impurities in the filtered wastewater, and a collection chamber (32) set at the output end of the air flotation chamber (33) for further filtration and elimination of air bubbles in the liquid. An inclined coarse filter screen (24) is fixedly connected inside the top surface of the primary filtration chamber (22). A flow guide block (25) is fixedly connected inside the primary filtration chamber (22). An inlet pipe (27) is fixedly connected to the top surface of the flow guide block (25). The inlet pipe (27) is connected to the flow guide cover (23). The bottom surface of the primary filtration chamber (22) is fixedly connected to a liquid storage chamber (28), and a columnar filter screen (26) is fixedly connected to the middle of the liquid storage chamber (28). The columnar filter screen (26) is connected to the liquid inlet pipe (27), and a manifold pipe (29) is fixedly connected to the output end of the liquid storage chamber (28). A hydraulic rod (210) is fixedly connected to the inner top surface of the flow guide (23). A sealing baffle (211) is fixedly connected to the output end of the hydraulic rod (210). A squeezing head (212) is fixedly connected to the bottom surface of the sealing baffle (211). The sealing baffle (211) is slidably connected inside the liquid inlet pipe (27) and the columnar filter screen (26).

2. The wastewater recycling system for recycled environmentally friendly corrugated board production according to claim 1, characterized in that: The internal part of the extrusion slag discharge seat (21) is fixedly connected to a hydraulic push rod (213), the output end of the hydraulic push rod (213) is fixedly connected to a bottom sealing plate (215), the top surface of the extrusion slag discharge seat (21) is fixedly connected to a slag discharge chamber (214), and the slag discharge chamber (214) is fixedly connected to the bottom surface of the liquid storage chamber (28).

3. The wastewater recycling system for recycled environmentally friendly corrugated board production according to claim 2, characterized in that: The columnar filter screen (26) is connected to the slag discharge chamber (214). The bottom sealing plate (215) is fixedly connected to the top surface of the bottom extrusion head (216). The bottom sealing plate (215) is in close contact with the bottom surface of the liquid storage chamber (28). The bottom extrusion head (216) is movably connected to the inside of the bottom surface of the columnar filter screen (26).

4. The wastewater recycling system for recycled environmentally friendly corrugated board production according to claim 1, characterized in that: The air flotation chamber (33) has an inlet (35) at the top side and an outlet (34) at the bottom side. A slag discharge pump (36) is fixedly connected to the top surface of the air flotation chamber (33). An air jet (37) is fixedly connected to the bottom surface of the air flotation chamber (33). An air pump (38) is fixedly connected to the bottom surface of the air flotation chamber (33). The air jet (37) is fixedly connected to the output end of the air pump (38).

5. The wastewater recycling system for recycled environmentally friendly corrugated board production according to claim 4, characterized in that: A bracket (31) is fixedly connected to the outer surface of the collection chamber (32), a drive motor is fixedly connected to the top surface of the collection chamber (32), a centrifuge chamber (310) is fixedly connected inside the collection chamber (32), a tight filter screen (39) is fixedly connected to the inner side of the centrifuge chamber (310), the input end of the centrifuge chamber (310) is fixedly connected to the inside of the liquid outlet (34), and a sealing water valve (311) is fixedly connected to the output end of the collection chamber (32).

6. The wastewater recycling system for recycled environmentally friendly corrugated board production according to claim 5, characterized in that: The centrifuge chamber (310) is rotatably connected to a deflector plate (312), one end of which penetrates the top surface of the collection chamber (32) and is fixedly connected to the output end of the drive motor.

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