Device and method for treating polyurethane glue production wastewater

Abstract

The invention discloses a polyurethane glue production wastewater treatment device and method.The device comprises a liquid storage pool, a reaction barrel is fixedly connected to the liquid storage pool, an outer barrel is connected to the bottom end of the interior of the reaction barrel in a penetrating mode, the outer barrel is rotationally connected with the reaction barrel, an inner barrel is clamped in the outer barrel, and an activation part is arranged in the inner barrel; a spiral stirring plate fixed to the outer circle face of the outer barrel forms up-down circulating flow during forward rotation, uniform mixing of wastewater and chemicals and balance of water quality and water quantity are achieved, switching grooves evenly distributed in the inner wall are matched with linkage blocks, synchronous rotation and relative static working conditions are flexibly switched, a liquid discharging groove is communicated with a discharging groove, and the working efficiency is improved. The design of a bucket-shaped guide table and an inclined plane is matched, so that supernate is smoothly guided into the inner cylinder, precipitated impurities are extruded out of entrained liquid during reverse rotation, and the follow-up treatment load is reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, specifically to a device and method for treating wastewater from polyurethane adhesive production. Background Technology

[0002] Polyurethane adhesive production wastewater is industrial wastewater generated during the preparation stages such as raw material pretreatment, polymerization reaction, product washing, and equipment cleaning. Its core characteristics are extremely high concentrations of organic pollutants, with a chemical oxygen demand (COD) of 10,000-50,000 mg / L or more. The pollutants have stable molecular structures, extremely poor biodegradability, and some components are toxic, which not only harms the aquatic ecosystem but also increases the difficulty of treatment. It is a typical high-concentration, recalcitrant organic wastewater. In the treatment process, coagulants and flocculants are first added to the wastewater for coagulation and sedimentation to separate large molecular organic matter from colloids, reducing COD and turbidity. Then, the pretreated wastewater is sent to an anaerobic reactor to decompose recalcitrant macromolecules and reduce the organic load. Subsequently, it enters an aerobic tank where aerobic microorganisms deeply degrade small molecular pollutants. Finally, flocs are separated in a sedimentation tank, and then purified by simple filtration or activated carbon adsorption to ensure that the effluent meets the standards before discharge.

[0003] Current wastewater treatment methods for polyurethane adhesive production often involve demulsification and sedimentation. During this stage, the sedimented impurities tend to carry a large amount of high-concentration organic wastewater. The lack of targeted liquid-solid separation enhancement measures prevents the effective removal of these contaminants, leading to some recalcitrant organic pollutants entering subsequent treatment processes along with the entrained liquid. This not only weakens the pretreatment effectiveness of demulsification and sedimentation, making it difficult to improve COD removal rates, but also directly increases the organic load on subsequent anaerobic reactors and aerobic tanks. This significantly increases the pressure on advanced treatment, which is already challenging due to the stable structure of the pollutants, affecting the operational stability of the treatment system and increasing the uncertainty of achieving effluent standards. Summary of the Invention

[0004] The purpose of this invention is to address the problem that in the existing treatment of polyurethane adhesive production wastewater, during the demulsification and sedimentation stage, impurities after sedimentation easily carry a large amount of high-concentration organic wastewater. The lack of targeted liquid-solid separation enhancement measures makes it impossible to fully remove the pollutants carried by the impurities, resulting in some recalcitrant organic pollutants entering subsequent treatment processes with the entrained liquid. This not only weakens the pretreatment effectiveness of demulsification and sedimentation, making it difficult to improve COD removal rate, but also directly increases the organic load on subsequent anaerobic reactors and aerobic tanks. This significantly increases the pressure on advanced treatment, which is already difficult due to the stable structure of pollutants, affecting the operational stability of the treatment system and increasing the uncertainty of the final effluent meeting standards. The invention provides a treatment device and method for polyurethane adhesive production wastewater.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device and method for treating polyurethane adhesive production wastewater, comprising: a storage tank, a reaction tank fixedly connected to the storage tank, an outer cylinder being rotatably connected to the bottom of the reaction tank, an inner cylinder being snapped into the outer cylinder, and an activating element being provided inside the inner cylinder;

[0006] A linkage block is fixedly connected to the outer circular surface of the inner cylinder. Multiple sets of linkage blocks are provided and evenly distributed on the outer circular surface of the inner cylinder.

[0007] A spiral stirring plate is fixedly connected to the outer circular surface of the outer cylinder. A switching groove is provided on the inner wall of the outer cylinder. Multiple sets of switching grooves are provided and evenly distributed on the inner wall of the outer cylinder. Each set of the linkage block is slidably inserted into a set of switching grooves.

[0008] When it is necessary to balance the amount and quality of wastewater in the reaction tank, or to mix wastewater with reagents to achieve coagulation and sedimentation, the activator controls the inner cylinder to rotate forward. Through the cooperation of the linkage block and the switching tank, the outer cylinder rotates forward synchronously. At this time, the spiral agitator plate will continuously scoop up the liquid at the bottom of the reaction tank, causing the liquid in the tank to form an up-and-down circulation flow, and finally achieve uniform mixing. When it is necessary to drain the liquid, the activator controls the inner cylinder to rotate in reverse, which in turn drives the outer cylinder to rotate in the opposite direction. The spiral agitator plate will exert a squeezing effect on the impurities that have settled in the reaction tank, and fully squeeze out the liquid carried in the impurities.

[0009] As a further embodiment of the present invention: the outer circular surface of the inner cylinder is provided with multiple sets of filter holes distributed in a spiral shape, and the filter holes are spaced at the same distance; the outer circular surface of the inner cylinder is provided with filter grooves, and the connecting block is arranged below the filter grooves; the filter grooves are provided with multiple sets evenly distributed, and each set of filter grooves and the multiple sets of filter holes above them are in the same vertical direction; filter screens are embedded in the filter grooves and filter holes, and the filter screens are flush with the outer circular surface of the inner cylinder.

[0010] As a further embodiment of the present invention: a drain groove is provided through the outer circular surface of the outer cylinder, and multiple sets of drain grooves are provided and evenly distributed on the outer circular surface of the outer cylinder; a material discharge groove is provided through the agitator plate, and multiple sets of material discharge grooves are provided and evenly distributed on the agitator plate; the material discharge groove is connected to the drain groove.

[0011] As a further embodiment of the present invention: a bucket-shaped guide platform is fixedly connected to the bottom of the inside of the reaction tank, and the bottom of the inside of the drain tank and the filter tank are both inclined surfaces, and are on the same inclined surface as the top of the bucket-shaped guide platform.

[0012] As a further embodiment of the present invention: the activator includes an upper fixing frame fixedly connected to the top of the reaction tank, a lower fixing frame fixedly connected inside the inner cylinder, a guide rod penetrating the upper fixing frame, the bottom end of the guide rod penetrating the lower fixing frame, and the guide rod being rotatably connected to the upper fixing frame and the lower fixing frame respectively. The guide rod is I-shaped, and the cross section of the guide rod in the area between the upper fixing frame and the lower fixing frame is cross-shaped. A motor is fixedly connected to the upper fixing frame, and the output end of the motor penetrates the upper fixing frame and is fixedly connected to the guide rod.

[0013] As a further embodiment of the present invention: a spiral rotating groove is provided on the inner wall of the inner cylinder, a rotating block is slidably inserted into the rotating groove, an activation block is fixedly connected inside the rotating block, the activation block is sleeved in the area between the upper fixed frame and the lower fixed frame of the guide rod, and is slidably inserted into the cross-shaped guide rod.

[0014] As a further embodiment of the present invention: the bottom end of the inner cylinder is threadedly connected to a filling box, and the filling box is located below the filter tank. The filling box is filled with quartz sand, and the bottom end of the filling box is provided with a liquid outlet groove. Multiple sets of liquid outlet grooves are provided and are evenly distributed at the bottom end of the filling box.

[0015] A method for treating wastewater from polyurethane adhesive production includes the following steps:

[0016] S1. First, inject polyurethane adhesive production wastewater and sodium hydroxide into the reaction tank, start the activator, the motor drives the guide rod to rotate forward, the activation block drives the inner cylinder to rotate synchronously, the linkage block pushes the outer cylinder to rotate together, and the stirring plate forms an up-and-down circulation flow, so that the wastewater and the reagent are evenly mixed, and the pH is adjusted to 6.5-8.5 to achieve a balance of water quantity and quality.

[0017] S2. After that, polyaluminum chloride and polyacrylamide are added to the neutralized wastewater. After repeated stirring, the mixture is allowed to settle. Then, the guide rod is reversed and the inner cylinder is rotated to align the drain tank with the filter hole. The supernatant flows into the storage tank after being filtered through the filter screen and the quartz sand filling box. The outer cylinder is reversed to squeeze out the sediment and impurities and the entrained liquid.

[0018] S3. Finally, the wastewater in the storage tank is pumped into the UASB reactor for anaerobic degradation of COD. The effluent enters the contact oxidation tank for aeration treatment, then undergoes sedimentation in the secondary sedimentation tank. After the supernatant is treated with disinfectant to kill bacteria, it is directly discharged or connected to the park's sewage pipe network.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this invention, a spiral stirring plate fixed on the outer circular surface of the outer cylinder forms an up-and-down circulating flow when rotating forward, achieving uniform mixing of wastewater and reagents and balancing of water quality and quantity. Through the switching grooves and linkage blocks evenly distributed on the inner wall, the synchronous rotation and relatively static working conditions can be flexibly switched. The discharge trough and the material drop trough are connected, and with the bucket-shaped guide platform and inclined surface design, the supernatant is smoothly introduced into the inner cylinder. When the reverse side is reversed, the sedimented impurities are squeezed out and the entrained liquid is squeezed out, reducing the load on subsequent treatment.

[0021] 2. In this invention, the filter holes spirally distributed on the outer circular surface of the inner cylinder, multiple sets of filter tanks and embedded flush filter screens are used to efficiently intercept suspended impurities and achieve preliminary filtration of the supernatant. The wastewater is then further purified and the water quality is improved through the detachable filling box at the bottom and the internal quartz sand. It is also easy to maintain and replace.

[0022] 3. In this invention, the rotating block in the activator cooperates with the spiral rotating groove of the inner cylinder. When the rotation is reversed, it drives the inner cylinder to rotate synchronously and move axially. No additional device is needed to complete the working condition switching, which simplifies the equipment structure. The fixed frame is connected by the I-shaped guide rod to ensure stable and safe operation. The drive and switching functions are integrated to realize automated continuous operation and reduce manual intervention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the reaction vessel in this invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the outer cylinder in this invention;

[0026] Figure 4 This is a schematic diagram of the inner cylinder structure in this invention;

[0027] Figure 5 This is a schematic diagram of the outer cylinder in this invention;

[0028] Figure 6 In this invention Figure 5 A schematic diagram of the structure at point A;

[0029] Figure 7 This is a cross-sectional view of the inner cylinder in this invention;

[0030] Figure 8 In this invention Figure 7 A schematic diagram of the structure at point B;

[0031] Figure 9 This is a schematic diagram of the structure of the activator in this invention;

[0032] Figure 10 This is a schematic diagram of the filling box in this invention.

[0033] In the diagram: 1. Storage tank; 2. Reaction vessel; 21. Guide platform; 3. Outer cylinder; 31. Stirring plate; 32. Drainage trough; 33. Material discharge trough; 34. Switching trough; 4. Inner cylinder; 41. Filter hole; 42. Filter tank; 43. Linking block; 44. Filling box; 45. Discharge trough; 5. Activation component; 51. Upper fixed frame; 52. Lower fixed frame; 53. Guide rod; 54. Rotating trough; 55. Rotating block; 56. Activation block; 57. Motor. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this 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. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 communication 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. The following describes embodiments of the invention based on its overall structure.

[0036] Reference Figures 1 to 3 In this embodiment of the invention, a device and method for treating polyurethane adhesive production wastewater includes: a storage tank 1, a reaction tank 2 fixedly connected to the storage tank 1, an outer cylinder 3 being connected through the bottom of the reaction tank 2 and rotatably connected to the reaction tank 2, an inner cylinder 4 being snapped into the outer cylinder 3, and an activator 5 being provided inside the inner cylinder 4.

[0037] Reference Figures 2 to 10The inner cylinder 4 is an integrated cylindrical hollow structure, forged from corrosion-resistant stainless steel. Multiple sets of interlocking blocks 43 are welded equidistantly along the outer circumference of the inner cylinder 4. Each set of interlocking blocks 43 is a cuboid structure with a polished surface to reduce sliding friction. Multiple vertical trajectory lines are first divided equidistantly along the circumference of the outer circumference of the inner cylinder 4. On each vertical trajectory line, multiple sets of filter holes 41 are opened axially at equal intervals, ensuring that the filter holes 41 on the same trajectory line are precisely connected in the vertical direction, forming multiple vertical straight porous channels extending along the axis of the inner cylinder 4. Simultaneously, all filter holes 41 are opened at a uniform helix angle, with adjacent vertical trajectories circumferentially connected. The filter holes 41 on the line are connected sequentially, eventually forming a continuous spiral. This achieves both a vertical straight channel distribution and meets the structural requirements for the spiral angle, balancing filtration uniformity and fluid throughput. Multiple sets of elongated filter grooves 42 are also formed on the outer surface of the inner cylinder 4. These grooves are evenly distributed along a ring, with a set of spirally distributed filter holes 41 directly above each groove, maintaining the same vertical direction. Stainless steel filter screens are embedded inside the filter holes 41 and filter grooves 42. The edges of the filter screens are fixed to the outer surface of the inner cylinder 4 by laser welding, ensuring complete flushness with the outer surface without any protrusions. The bottom end of the inner cylinder 4... A PP filling box 44 is threadedly connected, with a gap between the top of the filling box 44 and the bottom of the filter tank 42. The filling box 44 is filled with high-purity quartz sand, filling three-quarters of its volume. Multiple sets of outlet channels 45 are evenly distributed at the bottom of the filling box 44 to ensure uniform discharge. After the wastewater in the reaction tank 2 has been neutralized, stirred, and treated with polyaluminum chloride and polyacrylamide, and then allowed to settle, when the supernatant needs to be discharged, the activator 5 is activated, causing the inner cylinder 4 to rotate in the opposite direction and move axially downwards. The connecting block 43 on the outer surface of the inner cylinder 4 slides along the switching groove 34 of the outer cylinder 3 until the discharge channel 32 is precisely aligned with the filter hole 41. At this point, the supernatant in the reaction tank 2... Guided by the bucket-shaped guide platform 21, the wastewater flows into the filter holes 41 and filter tank 42 through the drain trough 32. After the embedded filter screen intercepts suspended impurities, it enters the inner cylinder 4. The wastewater flows downward along the inner wall of the inner cylinder 4, passes through the quartz sand layer in the filling box 44, and achieves secondary purification by adsorbing and filtering fine impurities through the quartz sand. Finally, it flows into the storage tank 1 at a constant speed through the outlet trough 45 at the bottom of the filling box 44. When the linkage block 43 slides to the limit position on the other side of the switching trough 34, the inner cylinder 4 drives the outer cylinder 3 to reverse synchronously. The filter screens of the filter holes 41 and filter tank 42 continue to intercept the small amount of impurities stirred up by the agitation, and the quartz sand in the filling box 44 maintains a stable filtration state.

[0038] The above solution is adopted as follows: the linkage block 43 ensures balanced transmission force between the inner cylinder 4 and the outer cylinder 3, and precise and smooth switching of working conditions. The combination design of the spiral filter hole 41 and the long strip filter groove 42 expands the filter contact area, improves the supernatant throughput, and avoids clogging of a single filter structure. The design of the filter screen being flush with the outer surface of the inner cylinder 4 prevents impurities from accumulating and clogging, and extends the service life of the filter screen. The threaded filling box 44 and the quartz sand filling design achieve secondary deep purification of wastewater, and the filling box 44 can be quickly disassembled for easy replacement and cleaning of quartz sand. Multiple evenly distributed outlet grooves 45 ensure smooth discharge of filtered wastewater and prevent water accumulation inside the inner cylinder 4 from affecting the treatment efficiency.

[0039] Reference Figures 5 to 6 The outer cylinder 3 is a cylindrical hollow structure, integrally formed from corrosion-resistant stainless steel. Its bottom end is rotatably connected to the inner wall of the reaction vessel 2 via bearings to ensure smooth rotation. A single continuous spiral agitator 31 is welded and fixed to the outer circular surface of the outer cylinder 3. The edges of the agitator 31 are rounded to avoid scratching the inner wall of the reaction vessel 2. Multiple sets of switching grooves 34 are evenly distributed along the annular line on the inner wall of the outer cylinder 3. The switching grooves 34 are rectangular recesses. The positions of each set of switching grooves 34 correspond one-to-one with the connecting blocks 43 of the inner cylinder 4. Multiple sets of droplets are formed along the spiral trajectory on the agitator 31. The outer cylinder 3 has multiple sets of drainage channels 32 evenly distributed along its outer circular surface. Each drainage channel 32 is a long, narrow through-hole, and each set of drainage channels 33 is connected to the corresponding drainage channel 32 on the outer cylinder 3. A bucket-shaped guide platform 21 is welded and fixed to the bottom of the inside of the reaction tank 2. The top of the guide platform 21 is an inclined surface. The bottom of the drainage channels 32 and the filter tank 42 are both machined with inclined surfaces of the same angle, and the tops of the three are completely fitted together to form a continuous flow channel. The bottom of the spiral stirring plate 31 is adapted to the top of the guide platform 21. When waste is injected into the reaction tank 2... After adding water and sodium hydroxide, the activator 5 is started, causing the inner cylinder 4 to rotate forward. This, in turn, causes the outer cylinder 3 to rotate synchronously through the contact between the linkage block 43 and the switching tank 34. At this time, the spiral agitator 31 rotates with the outer cylinder 3, continuously scooping up the liquid at the bottom of the reaction tank 2 and pushing it upwards along the spiral trajectory, promoting a circulating flow of the liquid inside the tank and achieving uniform mixing of wastewater and reagents. After adding polyaluminum chloride and polyacrylamide, the motor 57 is started again, rotating forward, and the outer cylinder 3 rotates synchronously. The agitator 31 continues to stir, ensuring a full reaction between the reagents and wastewater. After stirring is complete, the machine is stopped and allowed to stand still. When sedimentation occurs and the supernatant needs to be discharged, the electric starter 5 drives the inner cylinder 4 to reverse. During this process, the outer cylinder 3 remains stationary, and the drain trough 32 remains fixed with the outer cylinder 3 until it is precisely aligned with the filter hole 41 of the inner cylinder 4. The supernatant flows into the inner cylinder 4 through the drain trough 32. When the linkage block 43 slides to the limit position on the other side of the switching trough 34, the inner cylinder 4 drives the outer cylinder 3 to reverse synchronously, and the stirring plate 31 rotates in the opposite direction, which squeezes the sediment impurities in the reaction tank 2. The liquid carried in the impurities flows into the drain trough 32 through the discharge trough 33 and then into the inner cylinder 4.

[0040] The above solution employs the following: The spiral angle design of the spiral agitator 31 allows for efficient scooping of liquid from the bottom of the tank during forward rotation, creating a strong convection circulation that ensures uniform mixing of wastewater and chemicals, rapidly adjusting pH and balancing water quality. Multiple evenly distributed switching tanks 34 precisely coordinate with the inner cylinder 4's linkage block 43, enabling flexible switching between stirring and draining modes without the need for additional locking devices. The interconnected design of the drain tank 32 and the material drop tank 33, combined with the inclined bucket-shaped guide platform 21 and slope, ensures smooth flow of the supernatant and squeezed liquid into the inner cylinder 4, preventing liquid accumulation. The single continuous spiral agitator 31, when rotating in reverse, creates uniform pressure on precipitated impurities, fully squeezing out entrained liquid, effectively removing suspended organic matter and reducing the load on subsequent treatment processes.

[0041] Reference Figures 9 to 10The upper fixing frame 51 of the activator 5 has a cross-shaped frame structure and is fixedly connected to the top flange of the reaction vessel 2 by four sets of high-strength bolts. A through hole is opened in the center. The lower fixing frame 52 is welded and fixed in the lower middle part of the inner cylinder 4. The lower fixing frame 52 also has a cross-shaped structure and is aligned vertically with the upper fixing frame 51. It also has a through hole in the center, and a deep groove ball bearing is embedded in the hole. The guide rod 53 has an overall I-shaped structure, and its total length is adapted to the height of the inner cylinder 4. It is inserted into the inner ring of the bearings of the upper fixing frame 51 and the lower fixing frame 52 respectively to achieve a rotatable connection. The guide rod 53 is located in the middle area between the upper fixing frame 51 and the lower fixing frame 52. The inner cylinder 4 has a cross-shaped cross section. A servo motor 57 is fixedly connected to the top of the upper fixed frame 51. The output end passes through the center hole of the upper fixed frame 51 via a flexible coupling and is keyed to the top of the guide rod 53. The inner wall of the inner cylinder 4 has evenly spaced spiral rotating grooves 54. A rotating block 55 is slidably inserted into the rotating groove 54, with its outer side fitting against the inner wall of the rotating groove 54. A cylindrical activation block 56 is integrally formed inside the rotating block 55. The inner hole of the activation block 56 is machined into a cross-shaped through hole that matches the middle area of ​​the guide rod 53, allowing it to slide and insert into the middle area of ​​the guide rod 53. When it is necessary to process the wastewater in the reaction tank 2... During neutralization and stirring, the motor 57 is started and rotates forward. The motor 57 drives the guide rod 53 to rotate synchronously through the coupling. Because the middle area of ​​the guide rod 53 has a cross-shaped structure, the activation block 56 rotates synchronously with the guide rod 53 under the limiting action of the cross-shaped inner hole. At this time, the rotating block 55 is at the extreme position at the top of the rotating groove 54 of the inner cylinder 4. The rotating block 55 abuts against the top wall of the rotating groove 54. When the activation block 56 rotates, it pushes the rotating groove 54 through the rotating block 55, thereby driving the inner cylinder 4 to rotate synchronously forward. The inner cylinder 4 then abuts against the switching groove 34 of the outer cylinder 3 through the connecting block 43, driving the outer cylinder 3 to rotate synchronously to achieve stirring. When the wastewater sedimentation is complete... When switching to the drainage mode, the control motor 57 reverses, the guide rod 53 drives the activation block 56 to rotate in the opposite direction, and the rotating block 55 rotates and moves down along the tank under the guidance of the spiral rotating groove 54, driving the activation block 56 to move axially synchronously until the rotating block 55 and the bottom limit position of the rotating groove 54 come into contact. During this process, the inner cylinder 4 rotates in the opposite direction while the outer cylinder 3 remains stationary, achieving precise alignment between the drainage groove 32 and the filter hole 41. When the connecting block 43 slides to the limit position on the other side of the switching groove 34, the rotating block 55 continues to drive the rotating groove 54, causing the inner cylinder 4 to drive the outer cylinder 3 to rotate synchronously in the opposite direction, realizing the squeezing operation of the precipitated impurities.

[0042] The above solution employs a symmetrical design of the cross-shaped upper fixed frame 51 and lower fixed frame 52, coupled with the deep groove ball bearing and guide rod 53, to ensure smooth and stable rotation of the guide rod 53 and improve the stability of power transmission. The cross-shaped cross section in the middle area of ​​the guide rod 53, in conjunction with the cross-shaped inner hole of the activation block 56, ensures power transmission without slippage, allowing the activation block 56 and guide rod 53 to rotate synchronously. The sliding engagement of the spiral rotating groove 54 and the rotating block 55 transforms the rotational motion of the guide rod 53 into a combined rotational and axial movement motion of the inner cylinder 4, eliminating the need for additional drive devices and simplifying the equipment structure. The combination of the servo motor 57 and the flexible coupling enables precise control of the forward and reverse rotation of the guide rod 53. The wear-resistant rotating block 55 extends the equipment's service life. By integrating functions such as stirring drive, operating condition switching, and power transmission, automated continuous operation of all stages of wastewater treatment is achieved, reducing manual intervention and improving treatment efficiency and the accuracy of operating condition switching.

[0043] The working principle of this invention is as follows: In the initial state, the drain trough 32 of the outer cylinder 3 and the vertically distributed filter holes 41 of the inner cylinder 4 are misaligned, and the reaction tank 2 and the inner cylinder 4 are separated. At this time, the connecting block 43 of the inner cylinder 4 is located at the inner limit position of the switching groove 34 of the outer cylinder 3, the rotating block 55 of the activation element 5 is located at the top limit position of the rotating groove 54 on the inner cylinder 4, and the activation block 56 is located at the top of the guide rod 53. In use, polyurethane glue production wastewater and sodium hydroxide are first injected into the reaction tank 2, and then the activation element 5 is started. The motor 57 drives the guide rod 53 to rotate. Under the limiting action of the cross-shaped guide rod 53, the activation block 56 rotates synchronously. Because the rotating block 55 is located at the top limit position of the rotating groove 54, when the activation block 56 rotates, it drives the rotating block 55 and the inner cylinder 4 to rotate. The top of the rotating tank 54 abuts against the inner cylinder 4, thereby driving the inner cylinder 4 to rotate synchronously. At this time, the connecting block 43 abuts against the inner side of the switching tank 34. The inner cylinder 4 drives the outer cylinder 3 to rotate synchronously forward through the connecting block 43. The spiral stirring plate 31 continuously scoops up the liquid at the bottom of the reaction tank 2, forming an up-and-down circulation flow, so that the wastewater and sodium hydroxide are evenly mixed, and the pH value is adjusted to between 6.5 and 8.5 to avoid acid and alkali impact on the subsequent biological system and achieve water quantity and quality balance. Then, polyaluminum chloride and polyacrylamide are added to the neutralized wastewater, and the activator 5 is started again to repeat the above stirring operation. After stirring, the mixture is allowed to settle. When the supernatant needs to be taken out after settling, the activator 5 is started to control the guide rod 53 to reverse, which drives the activation block 56 to reverse. The rotating block 55 and the spiral rotating tank 54 cooperate to achieve this. As the activation block 56 rotates downwards, it moves until the rotating block 55 abuts against the bottom limit position of the rotating groove 54, thereby driving the inner cylinder 4 to rotate in the opposite direction. This causes the connecting block 43 to slide to the other limit position within the switching groove 34. During this process, the inner cylinder 4 rotates while the outer cylinder 3 remains stationary, ensuring that the drain groove 32 and the filter hole 41 are precisely aligned. The supernatant in the reaction tank 2 enters the inner cylinder 4 through the drain groove 32, filter hole 41, or filter groove 42. After initial filtration by the filter screens embedded in the filter hole 41 and filter groove 42, it undergoes secondary filtration through the quartz sand in the filling box 44 at the bottom of the inner cylinder 4. Finally, it flows into the storage tank 1 through the outlet groove 45. When the connecting block 43 reaches the other limit position of the switching groove 34, the inner cylinder 4 continues to rotate in the opposite direction, driving the outer cylinder 3 to rotate synchronously in the opposite direction. The spiral stirring plate... 31. The sediment in reaction tank 2 is squeezed to fully expel the liquid entrained in the impurities, removing suspended organic matter and some recalcitrant impurities, thus reducing the load on subsequent treatment. The filtered wastewater in storage tank 1 is pumped to the UASB reactor. The UASB reactor uses existing technology, namely an upflow anaerobic sludge bed reactor, which is a vertical cylindrical or rectangular tank. Wastewater enters from the bottom and flows upward through a high-concentration anaerobic sludge layer. Under the action of anaerobic microorganisms, organic matter is decomposed to produce biogas. It is a highly efficient anaerobic treatment device that simultaneously achieves sludge-water separation. It utilizes anaerobic microorganisms to degrade high-concentration COD and convert large organic molecules into smaller molecules. Subsequently, the biogas, wastewater, and sludge are efficiently separated by a three-phase separator at the top of the UASB reactor.The system collects and removes biogas such as methane to prevent sludge loss due to air bubbles. Activated sludge settles and flows back to the bottom of the reactor to maintain a high sludge concentration. The supernatant after anaerobic treatment is discharged smoothly. The anaerobic effluent enters the contact oxidation tank for aeration treatment, where microorganisms further degrade residual organic matter and reduce COD content. Finally, the aerobic effluent enters the secondary sedimentation tank for settling. A small amount of disinfectant is added to the supernatant to kill bacteria before it can be directly discharged or connected to the park's sewage network. The spiral agitator 31 fixed on the outer surface of the outer cylinder 3 forms an up-and-down circulation flow when rotating forward, achieving uniform mixing of wastewater and chemicals and balancing water quality and quantity. The switching grooves 34 evenly distributed on the inner wall cooperate with the linkage blocks 43 to flexibly switch between synchronous rotation and relatively static conditions. The system is connected to the discharge trough 32 and the material discharge trough 33, and is equipped with a bucket. The guide platform 21 and its inclined surface design ensure smooth flow of the supernatant into the inner cylinder. During reverse rotation, it squeezes out sediment and entrained liquid, reducing the load on subsequent treatment. The inner cylinder 4, with its spirally distributed filter holes 41, multiple filter tanks 42, and embedded flush filter screen, efficiently intercepts suspended impurities, achieving initial filtration of the supernatant. The removable bottom filling box 44 and internal quartz sand provide secondary deep purification of the wastewater, improving water quality and facilitating maintenance and replacement. The rotating block 55 in the activation component 5 cooperates with the spiral rotating groove 54 of the inner cylinder 4, causing the inner cylinder 4 to rotate synchronously and move axially during reverse rotation. No additional devices are needed for switching operating conditions, simplifying the equipment structure. The I-shaped guide rod 53 connects to the fixed frame, ensuring stable and safe operation. The integrated drive and switching functions enable automated continuous operation, reducing manual intervention.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for treating wastewater from polyurethane adhesive production, comprising: The liquid storage tank (1) is characterized in that a reaction tank (2) is fixedly connected to the liquid storage tank (1), an outer cylinder (3) is connected through the bottom of the reaction tank (2), and the outer cylinder (3) is rotatably connected to the reaction tank (2), an inner cylinder (4) is snapped into the outer cylinder (3), and an activator (5) is provided in the inner cylinder (4). The outer circular surface of the inner cylinder (4) is fixedly connected to a linkage block (43), and multiple sets of linkage blocks (43) are provided and evenly distributed on the outer circular surface of the inner cylinder (4); The outer cylinder (3) has a spiral stirring plate (31) fixedly connected to its outer circular surface. The inner wall of the outer cylinder (3) is provided with a switching groove (34). There are multiple sets of switching grooves (34) evenly distributed on the inner wall of the outer cylinder (3). Each set of the linkage block (43) is slidably inserted into a set of switching grooves (34). When it is necessary to balance the water volume and quality of the wastewater in the reaction tank (2), or to mix the wastewater with the reagent to achieve coagulation and sedimentation, the activator (5) controls the inner cylinder (4) to rotate forward. Through the cooperation of the linkage block (43) and the switching tank (34), the outer cylinder (3) is driven to rotate forward synchronously. At this time, the spiral stirring plate (31) will continuously scoop up the liquid at the bottom of the reaction tank (2), causing the liquid in the tank to form an up-and-down circulation flow, and finally achieve uniform mixing. When it is necessary to drain the liquid, the activator (5) controls the inner cylinder (4) to rotate in reverse, thereby driving the outer cylinder (3) to rotate in the opposite direction. The spiral stirring plate (31) will exert a squeezing effect on the impurities that have settled in the reaction tank (2), and fully squeeze out the liquid encased in the impurities.

2. The device for treating polyurethane adhesive production wastewater according to claim 1, characterized in that, The outer surface of the inner cylinder (4) is provided with multiple sets of spirally distributed filter holes (41) with the same spacing. The outer surface of the inner cylinder (4) is provided with filter grooves (42) and a connecting block (43) is provided below the filter grooves (42). The filter grooves (42) are provided with multiple sets evenly distributed, and each set of filter grooves (42) and the multiple sets of filter holes (41) above it are in the same vertical direction. The filter grooves (42) and filter holes (41) are embedded with filter screens, and the filter screens are flush with the outer surface of the inner cylinder (4).

3. The device for treating polyurethane adhesive production wastewater according to claim 2, characterized in that, The outer cylinder (3) has a through-hole drainage groove (32) on its outer circular surface. Multiple sets of drainage grooves (32) are provided and are evenly distributed on the outer circular surface of the outer cylinder (3). A discharge groove (33) is provided through-hole on the stirring plate (31). Multiple sets of discharge grooves (33) are provided and are evenly distributed on the stirring plate (31). The discharge groove (33) is connected to the drainage groove (32).

4. The device for treating polyurethane adhesive production wastewater according to claim 3, characterized in that, The bottom of the reaction tank (2) is fixedly connected to a bucket-shaped guide platform (21). The bottom of the drain tank (32) and the filter tank (42) are both inclined surfaces, and are on the same inclined surface as the top of the bucket-shaped guide platform (21).

5. The device for treating polyurethane adhesive production wastewater according to claim 4, characterized in that, The activator (5) includes an upper fixing frame (51) fixedly connected to the top of the reaction tank (2), a lower fixing frame (52) fixedly connected inside the inner cylinder (4), a guide rod (53) passing through the upper fixing frame (51), the bottom end of the guide rod (53) passing through the lower fixing frame (52), and the guide rod (53) being rotatably connected to the upper fixing frame (51) and the lower fixing frame (52) respectively. The guide rod (53) is I-shaped, and the cross section of the area between the upper fixing frame (51) and the lower fixing frame (52) is cross-shaped. A motor (57) is fixedly connected to the upper fixing frame (51), and the output end of the motor (57) passes through the upper fixing frame (51) and is fixedly connected to the guide rod (53).

6. The device for treating polyurethane adhesive production wastewater according to claim 5, characterized in that, The inner wall of the inner cylinder (4) is provided with a spiral rotating groove (54). A rotating block (55) is slidably inserted into the rotating groove (54). An activation block (56) is fixedly connected inside the rotating block (55). The activation block (56) is sleeved in the area between the upper fixed frame (51) and the lower fixed frame (52) of the guide rod (53) and is slidably inserted into the cross-shaped guide rod (53).

7. The device for treating polyurethane adhesive production wastewater according to claim 6, characterized in that, The bottom end of the inner cylinder (4) is threadedly connected to a filling box (44), and the filling box (44) is located below the filter tank (42). The filling box (44) is filled with quartz sand, and the bottom end of the filling box (44) is provided with a liquid outlet groove (45). Multiple sets of liquid outlet grooves (45) are provided and evenly distributed at the bottom end of the filling box (44).

8. The method of using the polyurethane adhesive production wastewater treatment device according to claim 7, characterized in that, Includes the following steps: S1. First, inject polyurethane glue production wastewater and sodium hydroxide into the reaction tank (2), start the activator (5), the motor (57) drives the guide rod (53) to rotate forward, the activation block (56) drives the inner cylinder (4) to rotate synchronously, the linkage block (43) pushes the outer cylinder (3) to rotate together, the stirring plate (31) forms an up-and-down circulation flow, so that the wastewater and the reagent are evenly mixed, and the pH is adjusted to 6.5-8.5 to achieve water quantity and water quality balance; S2. After that, polyaluminum chloride and polyacrylamide are added to the neutralized wastewater. After repeated stirring, the mixture is allowed to settle. Then, the guide rod (53) is reversed and the inner cylinder (4) is rotated so that the drain tank (32) is aligned with the filter hole (41). The supernatant flows into the storage tank (1) after being filtered by the filter screen, filling box (44) and quartz sand. The outer cylinder (3) is reversed to squeeze out the sediment impurities and entrained liquid. S3. Finally, the wastewater in the storage tank (1) is pumped into the UASB reactor for anaerobic degradation of COD. The effluent enters the contact oxidation tank for aeration treatment, and then undergoes sedimentation in the secondary sedimentation tank. After adding disinfectant to the supernatant to kill bacteria, it is directly discharged or connected to the park's sewage pipe network.

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