A harmless recovery device for saccharin sodium production wastewater

Abstract

The application discloses a saccharin sodium production wastewater harmless recovery device and relates to the technical field of sewage treatment. The device comprises a flocculation assembly, a multistage filtration assembly, a motor and a collection tank. The flocculation assembly is used for flocculating impurities in primary wastewater to form secondary wastewater and flocculation matters, and for conveying the secondary wastewater to the multistage filtration assembly. The multistage filtration assembly has a filter plate structure for active filtration through pressure difference. The secondary wastewater is subjected to multistage filtration through the filter plate structure to obtain tertiary wastewater. The motor is used for driving a stirring structure in the flocculation assembly to rotate and for controlling the filter plate structure to form a pressure difference for active filtration of the secondary wastewater. The application precisely controls the flow path of wastewater through an opening and closing structure, realizes the separation of wastewater feeding, flocculation, sedimentation and discharge, guarantees the continuity of wastewater treatment and avoids the treatment interruption problem caused by sedimentation and waiting in the traditional technology.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a device for the harmless recovery of saccharin sodium production wastewater. Background Technology

[0002] Sodium saccharin, as an important food additive, has a significant environmental concern regarding wastewater treatment during its production. The main raw material for sodium saccharin synthesis is methyl anthracene, which requires the addition of large amounts of hydrochloric acid, sulfuric acid, chlorine, sulfur dioxide, copper sulfate, and other chemical reagents. The widespread use of these chemicals results in wastewater containing substantial acid and alkali residues, as well as various harmful components, causing severe environmental pollution. Currently, the mainstream technology for treating sodium saccharin wastewater generally follows a process of pretreatment – ​​advanced treatment – ​​discharge or reuse, with the pretreatment stage being particularly crucial. This stage primarily involves flocculation and sedimentation to remove large particulate impurities. This step typically relies on adding flocculants to promote the aggregation and sedimentation of suspended solids, followed by further purification through filtration equipment.

[0003] Although existing technologies for treating sodium saccharin wastewater have achieved some success, significant shortcomings remain in practical operation. In the pretreatment flocculation and sedimentation stage, the addition and mixing of flocculants typically require stirring to ensure adequate dispersion and effectiveness. This is followed by a prolonged settling period to allow for effective separation of the precipitates. However, industrial treatment of sodium saccharin wastewater demands continuous operation, meaning the sedimentation process cannot be synchronized with the feeding and mixing steps. Otherwise, the newly added water flow would severely interfere with the already formed flocs, causing them to redisperse in the wastewater, increasing the difficulty and cost of subsequent treatment. To overcome this challenge, existing technologies often employ a strategy of setting up multiple reaction tanks in parallel to alternate the treatment of different batches of wastewater. This not only significantly increases the construction cost of wastewater treatment facilities but also limits the continuity of wastewater treatment, reducing overall treatment efficiency and flexibility. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a harmless recycling device for saccharin sodium production wastewater.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for the harmless recovery of saccharin sodium production wastewater includes a flocculation assembly, a multi-stage filtration assembly, a motor, and a collection box, wherein: The flocculation component is used to flocculate impurities in the primary wastewater to form secondary wastewater and flocs, and to deliver the secondary wastewater to the multi-stage filtration component. The multi-stage filtration assembly has a filter plate structure for active filtration through pressure difference, and the filter plate structure is used to filter secondary wastewater in multiple stages to obtain tertiary wastewater. The motor is used to drive the stirring structure located in the flocculation component to rotate, and to control the filter plate structure to form a pressure difference to actively filter the secondary wastewater; The collection box is used to collect the flocs formed in the flocculation component and the filter residue filtered out by the multi-stage filtration component.

[0006] Preferably, the flocculation component includes a flocculation tank, and the flocculation tank is provided with three partitions arranged from top to bottom, dividing the flocculation tank into a feeding chamber, a flocculation chamber, a sedimentation chamber and a discharge chamber from top to bottom, and the discharge chamber is connected to the multi-stage filtration component; A drive shaft is vertically installed inside the flocculation tank. The drive shaft is connected to the output end of a motor. The drive shaft is provided with an opening and closing structure corresponding to the three partitions. When the motor rotates in the forward direction, the feed chamber and the flocculation chamber are connected, the flocculation chamber and the sedimentation chamber are separated, and the sedimentation chamber and the discharge chamber are connected. When the motor rotates in the reverse direction, the feed chamber and the flocculation chamber are separated, the flocculation chamber and the sedimentation chamber are connected, and the sedimentation chamber and the discharge chamber are separated.

[0007] Preferably, the opening and closing structure includes a control disk rotatably mounted on a drive shaft, a circular cavity adapted to the control disk is opened in the center of the partition, the control disk is rotatably connected to the circular cavity in a sealed manner, a plurality of circumferentially arrayed openings I are opened on the control disk, and a plurality of openings II corresponding to the openings I are opened on the partition, when the openings I and II coincide, the spaces on both sides of the partition are connected. A damping mechanism is provided between the control disk and the drive shaft, and a limiting mechanism is provided in the cavity to limit the rotation range of the control disk. The rotation of the drive shaft drives the control disk to rotate through the frictional resistance of the damping mechanism, and when the control disk rotates to the limit position of the limiting mechanism, the drive shaft overcomes the damping mechanism and rotates on its own.

[0008] Preferably, the limiting mechanism includes a limiting post disposed on the inner sidewall of the circular cavity, and a limiting groove is formed on the outer peripheral surface of the control disk, with the limiting post located in the limiting groove.

[0009] Preferably, the flocculation component further includes a material extraction pipe that connects the sedimentation chamber and the collection box, and the bottommost partition is conical, with the input end of the material extraction pipe connected to the bottom of the conical partition.

[0010] Preferably, a plurality of stirring rods are fixedly disposed on the outer wall of the drive shaft, and the stirring rods are located inside the flocculation chamber.

[0011] Preferably, the multi-stage filtration assembly includes a filter box, the filter plate structure is located inside the filter box, the filter plate structure includes multiple inclined fixed filter plates and movable filter plates, the multiple fixed filter plates and movable filter plates are alternately arranged, the high side and low side of the fixed filter plates are fixedly installed on the side wall of the filter box, and the inclined side of the multiple movable filter plates is fixedly installed with the same movable frame, so that the fixed filter plates, movable filter plates and movable frames form a closed filtration space; A transmission mechanism for driving the longitudinal reciprocating motion of the movable frame is provided between the movable frame and the drive shaft. Both the fixed filter plate and the movable filter plate are provided with multiple equally spaced filter bags. The filter bags only allow fluid to pass through in one direction. When the movable filter plate moves longitudinally back and forth, a pressure difference is formed on both sides of the movable filter plate. The bottom of the filter box is equipped with a decolorizing agent addition pipe and an aeration pipe arranged in a serpentine shape, both of which are located below the filter plate structure.

[0012] Preferably, the transmission mechanism includes a transmission sleeve fixedly disposed at the bottom end of the drive shaft, a transmission rod slidably sleeved with the transmission sleeve on the top of the movable frame, a pressing post radially mounted on the side wall of the transmission rod, an inclined annular groove opened on the inner wall of the transmission sleeve, and the pressing post extending into the annular groove and abutting against the inner wall of the annular groove.

[0013] Preferably, the filter capsule includes a base plate with a disc-shaped opening facing upwards, a ball head with a filter hole in the center at the bottom end of the base plate, and a buffer cavity inside the ball head. The filter capsule is made of elastic rubber.

[0014] Preferably, the lower side of the fixed filter plate and the movable filter plate faces the collection box, and a slag discharge port is provided on the side where the filter box and the collection box are connected. A sealing plate for sealing the slag discharge port is slidably arranged inside the collection box, and an adjustment structure for controlling the opening and closing state of the sealing plate is provided on the side of the sealing plate extending outside the collection box.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention, by setting up a flocculation component, wherein the flocculation tank is divided into a feeding chamber, a flocculation chamber, a sedimentation chamber and a discharge chamber, and by precisely controlling the flow path of wastewater through an opening and closing structure, achieves the separate operation of wastewater feeding, flocculation, sedimentation and discharge. This not only ensures the continuity of wastewater treatment and avoids the problem of treatment interruption caused by sedimentation waiting in traditional technologies, but also significantly improves the overall integration and automation level of the device and reduces the cost of manual operation.

[0016] 2. This invention uses a multi-stage filtration system to actively filter wastewater through pressure difference. Compared to traditional passive sedimentation filtration, this device can remove fine impurities from wastewater more quickly and effectively. This active filtration method not only improves filtration efficiency but also ensures the stability of the effluent quality, providing a strong guarantee for the subsequent utilization or compliant discharge of wastewater.

[0017] 3. By setting up a filter capsule, this invention achieves unidirectional fluid flow, effectively preventing backflow during the filtration process. Furthermore, the buffer chamber set inside the filter capsule can squeeze the filter capsule during the movement of the movable filter plate, causing the residual wastewater in the buffer chamber to burst out towards the liquid inlet, forming a backwashing effect on the filter pores. This achieves a self-cleaning function for the filter pores, which not only extends the service life of the multi-stage filtration components but also reduces maintenance costs and downtime.

[0018] 4. By setting up a collection box, all impurities generated during flocculation and filtration, including flocculants and filter residue, are collected in the collection box, which not only simplifies the impurity treatment process but also facilitates the daily cleaning and maintenance of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 3 This is a cross-sectional structural schematic diagram of a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 4 This is a schematic diagram of the drive shaft in a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 5 This is a cross-sectional view of the first position control panel of the saccharin sodium production wastewater harmless recovery device proposed in this invention, under forward rotation. Figure 6 This is a schematic diagram of the structure of the second position control panel of the saccharin sodium production wastewater harmless recovery device proposed in this invention, under forward rotation. Figure 7 This is a schematic diagram of the structure of the third position control panel of the saccharin sodium production wastewater harmless recovery device proposed in this invention, under forward rotation. Figure 8 This is a schematic diagram of the movable frame and movable filter plate in a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 9 This is a schematic diagram of the transmission sleeve in a saccharin sodium production wastewater harmless recovery device proposed in this invention; Figure 10 for Figure 3 A magnified structural diagram of part A in the middle; Figure 11 for Figure 3 A magnified structural diagram of part B in the middle section; Figure 12 This is a schematic diagram of the sealing plate in a saccharin sodium production wastewater harmless recovery device proposed in this invention.

[0020] In the diagram: 1. Flocculation assembly; 11. Flocculation tank; 12. Baffle plate; 121. Opening two; 122. Limiting post; 13. Drive shaft; 131. Transmission sleeve; 132. Annular groove; 14. Control panel; 141. Opening one; 142. Limiting groove; 143. Damping ring; 15. Feed extraction pipe; 16. Stirring rod; 2. Multi-stage filtration assembly; 21. Filter box; 22. Fixed filter plate; 23. Movable filter plate; 24. Movable frame; 241. Transmission rod; 242. Pressure column; 25. Filter bag; 251. Base plate; 252. Filter holes; 253. Ball head; 254. Buffer chamber; 26. Aeration pipe; 27. Decolorizing agent addition pipe; 3. Collection box; 31. Slag discharge port; 32. Sealing plate; 33. Threaded ring; 34. Threaded rod; 35. Guide groove; 4. Motor. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figure 1-3 A device for the harmless recovery of saccharin sodium production wastewater includes a flocculation component 1, a multi-stage filtration component 2, a motor 4, and a collection box 3.

[0023] The flocculation component 1 is equipped with a waste liquid inlet pipe. Primary wastewater is introduced into the flocculation component 1 for flocculation and impurity removal. The flocculation component 1 is used to flocculate impurities in the primary wastewater to form secondary wastewater and flocs, and then delivers the secondary wastewater to the multi-stage filtration component 2. The flocs are collected through the collection box 3.

[0024] Motor 4 is used to drive the stirring structure located in the flocculation component 1 to rotate, and to control the filter plate structure to form a pressure difference to actively filter the secondary wastewater. Motor 4 is a geared motor, which is existing technology and will not be described in detail here.

[0025] Reference Figure 2-7The flocculation component 1 includes a flocculation tank 11, which is equipped with three baffles 12 arranged from top to bottom, dividing the flocculation tank 11 into a feeding chamber, a flocculation chamber, a sedimentation chamber, and a discharge chamber. The discharge chamber is connected to the multi-stage filtration component 2. After the wastewater enters the flocculation tank 11, it is temporarily stored in the feeding chamber. In the flocculation chamber, flocculant is added and stirred to cause large particles of impurities to flocculate into clumps. After entering the sedimentation chamber, the wastewater is allowed to settle. Finally, the flocculated clumps are discharged into the collection box 3. The resulting secondary wastewater enters the discharge chamber and is discharged into the multi-stage filtration component 2 for the filtration of residual impurities.

[0026] A drive shaft 13 is vertically installed inside the flocculation tank 11. The drive shaft 13 is connected to the output end of the motor 4. The drive shaft 13 is equipped with an opening and closing structure corresponding to the three partitions 12. The opening and closing structure is controlled by the rotation direction of the motor 4. When the wastewater harmless recycling device treats wastewater, it controls the motor 4 to rotate alternately in the forward and reverse directions. When the motor 4 rotates in the forward direction, the feed chamber and the flocculation chamber are connected, the flocculation chamber and the sedimentation chamber are separated, and the sedimentation chamber and the discharge chamber are connected. When the motor 4 rotates in the reverse direction, the feed chamber and the flocculation chamber are separated, the flocculation chamber and the sedimentation chamber are connected, and the sedimentation chamber and the discharge chamber are separated.

[0027] Specifically, the control motor 4 rotates forward, connecting the feeding chamber and the flocculation chamber, while separating the flocculation chamber and the sedimentation chamber. At this time, the wastewater entering the flocculation tank 11 does not linger in the feeding chamber but flows directly into the flocculation chamber, where flocculant is added for flocculation and agglomeration. When the flocculation chamber is full, the control motor 4 rotates in reverse, separating the feeding chamber and the flocculation chamber. Subsequent wastewater entering then remains in the feeding chamber, waiting. The flocculation chamber and the sedimentation chamber then connect, and the wastewater that has completed flocculation in the flocculation chamber enters the sedimentation chamber. At this time, the incoming wastewater does not contact the wastewater in the sedimentation chamber, and the water flow impact does not affect the sedimented wastewater, thus maintaining a good sedimentation effect. The sedimentation time coincides with the time for adding wastewater to the feeding chamber. Once the feeding chamber is full, sedimentation is complete, thus achieving the desired sedimentation effect. The continuous treatment of paired wastewater is achieved by controlling motor 4 to rotate in the forward direction, connecting the sedimentation chamber and the discharge chamber. Wastewater that has completed sedimentation and decontamination enters the discharge chamber for discharge. At the same time, the feed chamber and the flocculation chamber are connected, while the flocculation chamber and the sedimentation chamber are separated. Wastewater stored in the feed chamber directly enters the flocculation chamber for flocculation. Since the addition of flocculant and the mixing of wastewater require a short time, once the flocculation chamber is full, motor 4 can be controlled to rotate in the reverse direction to repeat the above process. This achieves the separation of wastewater feeding, flocculation, sedimentation, and discharge, which not only ensures the continuity of wastewater treatment and avoids the problem of treatment interruption caused by sedimentation waiting in traditional technologies, but also significantly improves the overall integration and automation level of the device and reduces manual operation costs.

[0028] Reference Figure 2-7The opening and closing structure includes a control disk 14 rotatably mounted on a drive shaft 13. A circular cavity adapted to the control disk 14 is opened in the center of a partition 12. The control disk 14 is rotatably connected to the circular cavity in a sealed manner. Multiple openings 141 are arranged in a circular array on the control disk 14. Multiple openings 121 corresponding to the openings 141 are opened on the partition 12. When openings 141 and 121 overlap, the spaces on both sides of the partition 12 are connected. The width of opening 141 needs to be smaller than the interval width between two adjacent openings 141 to ensure that openings 141 and 121 are completely closed when they are misaligned.

[0029] A damping mechanism is provided between the control panel 14 and the drive shaft 13. The damping mechanism includes a damping ring 143 fixedly mounted inside the control panel 14. The inner wall of the damping ring 143 is a rubber layer. While ensuring a sealed and rotatable connection between the damping ring 143 and the drive shaft 13, the frictional resistance between the rubber layer and the drive shaft 13 provides a damping effect to the control panel 14, so that the control panel 14 maintains the same motion state as the drive shaft 13 under the action of no external force. When the drive shaft 13 rotates, the control panel 14 will remain rotating with the drive shaft 13 before encountering a rigid external force. A limiting mechanism is provided in the cavity to limit the rotation range of the control panel 14. The rotation of the drive shaft 13 drives the control panel 14 to rotate through the frictional resistance of the damping mechanism. When the control panel 14 rotates to the limit position of the limiting mechanism, the drive shaft 13 overcomes the damping mechanism and rotates on its own.

[0030] The limiting mechanism includes a limiting post 122 disposed on the inner side wall of the circular cavity, and a limiting groove 142 opened on the outer peripheral surface of the control disk 14. The limiting post 122 is located in the limiting groove 142. Among the three control disks 14, the limiting grooves 142 in the control disks 14 located in the first and third positions are set in the same position. When the motor 4 rotates in the forward direction, the control disk 14 rotates with the drive shaft 13 until the first opening 141 and the second opening 121 coincide, the feeding chamber and the flocculation chamber are connected, the sedimentation chamber and the discharge chamber are connected, the side wall of the limiting groove 142 abuts against the limiting post 122, the control disk 14 can no longer rotate, the control disk 14 remains in the state where the first opening 141 and the second opening 121 coincide, and the drive shaft 13 continues to rotate over the resistance of the damping mechanism.

[0031] The limiting groove 142 in the control panel 14 located in the second position is circumferentially misaligned with the limiting grooves 142 on the other two partitions 12. When the limiting groove 142 in the partition 12 located in the second position abuts against the limiting post 122 when the motor 4 rotates in the forward direction, the second opening 121 of the partition 12 and the corresponding first opening 141 are in a closed state, separating the flocculation chamber and the sedimentation chamber.

[0032] When the motor 4 rotates in the reverse direction, the control disk 14 located in the first and third positions will rotate in the reverse direction until the other end face of the limiting groove 142 abuts against the limiting post 122. At this time, opening one 141 and opening two 121 are closed, the feeding chamber and the flocculation chamber are separated, and the sedimentation chamber and the discharge chamber are separated. At the same time, opening one 141 and opening two 121 on the control disk 14 located in the second position coincide, and the flocculation chamber and the sedimentation chamber are connected.

[0033] The flocculation assembly 1 also includes a material extraction pipe 15, which connects the sedimentation chamber and the collection box 3. An auger is installed inside the material extraction pipe 15. The auger rotates to pump the precipitated flocculent material into the collection box 3. The flocculated sediment inside the auger also has a sealing effect, maintaining the airtightness of the device. The bottom partition 12 is conical. The input end of the material extraction pipe 15 is connected to the bottom of the conical partition 12. The conical shape is conducive to the accumulation of sediment for pumping by the auger.

[0034] Multiple stirring rods 16 are fixedly installed on the outer wall of the drive shaft 13. The stirring rods 16 are located inside the flocculation chamber. When the drive shaft 13 starts to rotate, it will drive these stirring rods 16 to rotate continuously. The continuous rotation of the stirring rods 16 mixes and stirs the wastewater and flocculant in the flocculation chamber, promotes the chemical reaction or physical adsorption process between the wastewater and flocculant, improves the flocculation effect, and effectively captures and coagulates suspended particles or colloidal substances in the wastewater.

[0035] Reference Figure 1-3 and Figure 8-10 The multi-stage filtration component 2 has a filter plate structure that performs active filtration through pressure difference. The filter plate structure performs multi-stage filtration of secondary wastewater to obtain tertiary wastewater. Compared with traditional passive sedimentation filtration, this device can remove fine impurities in wastewater more quickly and effectively. This active filtration method not only improves filtration efficiency but also ensures the stability of effluent water quality, providing a strong guarantee for the subsequent utilization or compliant discharge of wastewater.

[0036] The multi-stage filtration assembly 2 includes a filter box 21, with a filter plate structure located inside the filter box 21. The filter plate structure includes multiple fixed filter plates 22 and movable filter plates 23 arranged at an angle. The multiple fixed filter plates 22 and movable filter plates 23 are arranged alternately. The high and low sides of the fixed filter plates 22 are fixedly installed on the side wall of the filter box 21. The same movable frame 24 is fixedly installed on the inclined sides of the multiple movable filter plates 23, so that the fixed filter plates 22, movable filter plates 23 and movable frame 24 form a closed filtration space. The movable frame 24 moves, causing the movable filter plates 23 to move, so that the pressure changes on both sides of the movable filter plates 23 to form a pressure difference. Under the action of the pressure difference, active filtration is achieved.

[0037] A transmission mechanism for driving the longitudinal reciprocating motion of the movable frame 24 is provided between the movable frame 24 and the drive shaft 13. The transmission mechanism outputs power through the motor 4.

[0038] Reference Figure 1-3 and Figure 8-10 Both the fixed filter plate 22 and the movable filter plate 23 are equipped with multiple equidistantly distributed filter bags 25. The filter bags 25 are used to filter residual flocculated impurities and some small particulate impurities in the secondary wastewater. The filter bags 25 only allow fluid to pass through in one direction. When the movable filter plate 23 reciprocates longitudinally, a pressure difference is formed on both sides of the movable filter plate 23. When the movable filter plate 23 moves upward, the pressure in the space below the movable filter plate 23 decreases, and the pressure in the space above increases. The filter bags 25 only allow fluid to flow downwards from top to bottom. Under the action of the filter, the high-pressure wastewater located above the movable filter plate 23 flows down to the lower part of the movable filter plate 23 through the filter bag 25 and is filtered when passing through the filter bag 25. When the movable filter plate 23 moves downward, the pressure in the space below the movable filter plate 23 increases, and the wastewater is discharged through the fixed filter plate 22 located adjacent to the lower part of the movable filter plate 23. The pressure in the space above decreases, and the wastewater is reintroduced through the fixed filter plate 22 located adjacent to the upper part of the movable filter plate 23. This cycle repeats, achieving the purpose of multi-stage active filtration.

[0039] The bottom of the filter box 21 is equipped with a decolorizing agent addition pipe 27 and an aeration pipe 26 arranged in a serpentine pattern. Both the decolorizing agent addition pipe 27 and the aeration pipe 26 are located below the filter plate structure. The secondary wastewater undergoes multi-stage filtration through the filter plate structure to obtain tertiary wastewater. A decolorizing agent is added to the tertiary wastewater through the decolorizing agent addition pipe 27. In this embodiment, the decolorizing agent is activated carbon. The aeration pipe 26 ensures that the wastewater and the decolorizing agent are in full contact. After the decolorizing agent completes the decolorization, the wastewater is discharged from the filter box 21 for subsequent treatment, including vacuum concentration or evaporation concentration, condensation and recovery of hydrochloric acid in the wastewater, and improvement of hydrochloric acid purity.

[0040] The transmission mechanism includes a transmission sleeve 131 fixedly mounted on the bottom end of the drive shaft 13. A transmission rod 241, slidably sleeved with the transmission sleeve 131, is mounted on the top of the movable frame 24. A pressing post 242 is radially mounted on the side wall of the transmission rod 241. An inclined annular groove 132 is formed on the inner wall of the transmission sleeve 131. The pressing post 242 extends into the annular groove 132 and abuts against the inner wall of the annular groove 132. When the drive shaft 13 rotates, since the transmission sleeve 131 is fixed to the drive shaft 13, the drive shaft 1... 3 will drive the transmission sleeve 131 and the annular groove 132 to rotate together. Since the pressing column 242 abuts against the inner wall of the annular groove 132, its position relative to the transmission rod 241 will change as the annular groove 132 rotates. The annular groove 132 is set in an inclined direction. When the drive shaft 13 rotates, the pressing column 242 will move back and forth between the low point and the high point of the annular groove 132, thereby driving the transmission rod 241 to reciprocate along the circumference of the transmission sleeve 131, and then driving the movable frame 24 to reciprocate.

[0041] Reference Figure 10 The filter capsule 25 includes a base plate 251 with a disc-shaped opening facing upwards. A ball head 253 with a filter hole 252 in the center is provided at the bottom of the base plate 251. A buffer chamber 254 is also provided inside the ball head 253. The filter capsule 25 is made of elastic rubber. The ball head 253 is located at the bottom of the base plate 251 and has a filter hole 252 in the center. This is the only channel for fluid to flow out of the filter capsule 25. The filter capsule 25 is made of elastic rubber, which has good elasticity and sealing performance. When the pressure on the base plate 251 side is greater, the pressure at the large opening of the base plate 251 in the filter capsule 25 is higher than the pressure at the outside of the filter capsule 25 and at the filter hole 252. The filter capsule 25 deforms, so the fluid can flow from the large opening towards the filter hole 252. When the pressure on the ball head 253 side is greater, the ball head 253 is compressed towards the base plate 251 under pressure, so that the filter hole 252 is sealed, thus blocking the fluid.

[0042] Due to the presence of impurities, the filter holes 252 will inevitably become clogged during filtration. The filter bags 25 on the movable filter plate 23 and the fixed filter plate 22 are staggered. When the movable filter plate 23 moves up and gets close to the fixed filter plate 22, it can squeeze the filter bags 25 on the fixed filter plate 22. When the movable filter plate 23 moves down, it can squeeze its own filter bags 25, causing the residual wastewater in the buffer chamber 254 to burst out in the direction of liquid inlet, forming a backwashing effect on the filter holes 252. This achieves the self-cleaning function of the filter holes 252, which not only extends the service life of the multi-stage filter assembly 2, but also reduces maintenance costs and downtime.

[0043] The collection box 3 is used to collect the flocs formed in the flocculation component 1 and the filter residue filtered out by the multi-stage filtration component 2.

[0044] Reference Figure 1-3 and Figure 11-12Specifically, the residue filtered from the movable filter plate 23 and the fixed filter plate 22 will collect towards the lower position along the inclined movable filter plate 23 and the fixed filter plate 22. The lower side of the fixed filter plate 22 and the movable filter plate 23 faces the collection box 3. A slag discharge port 31 is provided on the side where the filter box 21 and the collection box 3 are connected. In order to ensure the sealing of the slag discharge port 31 when it is idle, a sealing plate 32 for sealing the slag discharge port 31 is slidably provided inside the collection box 3. An adjustment structure for controlling the opening and closing state of the sealing plate 32 is provided on the side of the sealing plate 32 extending outside the collection box 3. The adjustment structure includes a threaded ring 33 movably connected to the top of the sealing plate 32. The threaded ring 33 can slide and rotate on the sealing plate 32. The ring 33 is threadedly connected to the threaded rod 34 fixedly installed on the top of the collection box 3. The collection box 3 is provided with a guide groove 35, which has an inclined part and a vertical part. The sealing plate 32 is slidably connected to the guide groove 35. Rotating the threaded ring 33 will cause the threaded ring 33 to move axially along the threaded rod 34, which will drive the sealing plate 32 to move. When the sealing plate 32 blocks the slag discharge port 31, rotating the threaded ring 33 will cause the sealing plate 32 to move upward. The sealing plate 32 first moves upward along the inclined part of the guide groove 35 until the sealing plate 32 is misaligned with the side wall of the collection box 3, and then moves upward along the vertical part. The lateral displacement of the sealing plate 32 is compensated by the lateral sliding between the threaded ring 33 and the sealing plate 32.

[0045] The specific working principle of this invention is as follows: In operation, primary wastewater is fed into flocculation tank 11. Motor 4 is rotated forward, connecting the feed chamber and flocculation chamber, while separating the flocculation chamber and sedimentation chamber. Wastewater entering flocculation tank 11 does not linger in the feed chamber but flows directly into the flocculation chamber, where flocculant is added for flocculation and agglomeration. When the flocculation chamber is full, motor 4 is rotated in reverse, separating the feed chamber and flocculation chamber. Subsequent wastewater enters and waits in the feed chamber. The flocculation chamber and sedimentation chamber are connected, and the flocculated wastewater enters the sedimentation chamber. At this point, the feed wastewater does not contact the wastewater in the sedimentation chamber, and the water flow impact does not affect the sedimented wastewater, thus maintaining a good sedimentation effect. The sedimentation time coincides with the time required to replenish wastewater in the feed chamber. Once the feed chamber is full, sedimentation is complete, ensuring continuous wastewater treatment. Motor 4 is then rotated forward, connecting the sedimentation chamber and discharge chamber, and the sedimented and cleaned wastewater enters the discharge chamber for discharge.

[0046] The discharged secondary wastewater enters the multi-stage filtration assembly 2. When the motor 4 rotates, it drives the movable frame 24 to reciprocate through the transmission mechanism. At the same time, the movable filter plate 23 reciprocates longitudinally, creating a pressure difference on both sides of the movable filter plate 23. When the movable filter plate 23 moves upward, the pressure in the space below the movable filter plate 23 decreases, while the pressure in the space above it increases. The filter capsule 25 only allows fluid to flow from top to bottom. Under the action of the pressure difference, the high-pressure wastewater located above the movable filter plate 23 flows down the movable filter plate 23 through the filter capsule 25 and is filtered as it passes through the filter capsule 25. When the movable filter plate 23 moves downward, the pressure in the space below the movable filter plate 23 increases, causing the wastewater to be discharged through the fixed filter plate 22 located adjacent to the movable filter plate 23 below. The pressure in the space above decreases, causing the wastewater to be reintroduced through the fixed filter plate 22 located adjacent to the movable filter plate 23 above. This cycle repeats, achieving the purpose of multi-stage active filtration.

[0047] Secondary wastewater undergoes multi-stage filtration through a filter plate structure to obtain tertiary wastewater. Decolorizing agent is added to the tertiary wastewater through decolorizing agent addition pipe 27. In this embodiment, the decolorizing agent is activated carbon. The decolorizing agent is fully contacted with the wastewater by the aeration pipe 26. After the decolorizing agent completes the decolorization, the wastewater is discharged from the filter box 21 for further treatment.

Claims

1. A device for the harmless recovery of saccharin sodium production wastewater, characterized in that, It includes a flocculation component (1), a multi-stage filtration component (2), a motor (4), and a collection box (3), wherein: The flocculation component (1) is used to flocculate impurities in the primary wastewater to form secondary wastewater and flocs, and to deliver the secondary wastewater to the multi-stage filtration component (2); The multi-stage filtration assembly (2) has a filter plate structure for active filtration through pressure difference, and the filter plate structure is used to filter secondary wastewater in multiple stages to obtain tertiary wastewater. The motor (4) is used to drive the stirring structure located in the flocculation component (1) to rotate, and to control the filter plate structure to form a pressure difference to actively filter the secondary wastewater; The collection box (3) is used to collect the flocs formed in the flocculation component (1) and the filter residue filtered out by the multi-stage filtration component (2); The flocculation component (1) includes a flocculation tank (11), and three partitions (12) are arranged in the flocculation tank (11) from top to bottom, dividing the flocculation tank (11) into a feeding chamber, a flocculation chamber, a sedimentation chamber and a discharge chamber from top to bottom. The discharge chamber is connected to the multi-stage filtration component (2). A drive shaft (13) is vertically installed inside the flocculation tank (11). The drive shaft (13) is connected to the output end of the motor (4). The drive shaft (13) is provided with an opening and closing structure corresponding to the three partitions (12). When the motor (4) rotates in the forward direction, the feed chamber and the flocculation chamber are connected, the flocculation chamber and the sedimentation chamber are separated, and the sedimentation chamber and the discharge chamber are connected. When the motor (4) rotates in the reverse direction, the feed chamber and the flocculation chamber are separated, the flocculation chamber and the sedimentation chamber are connected, and the sedimentation chamber and the discharge chamber are separated. The multi-stage filtration assembly (2) includes a filter box (21), and the filter plate structure is located inside the filter box (21). The filter plate structure includes multiple fixed filter plates (22) and movable filter plates (23) arranged at an angle. The multiple fixed filter plates (22) and movable filter plates (23) are arranged alternately. The high and low sides of the fixed filter plates (22) are fixedly installed on the side wall of the filter box (21). The same movable frame (24) is fixedly installed on the inclined side of the multiple movable filter plates (23), so that the fixed filter plates (22), movable filter plates (23) and movable frame (24) form a closed filtration space. A transmission mechanism for driving the longitudinal reciprocating motion of the movable frame (24) is provided between the movable frame (24) and the drive shaft (13); Both the fixed filter plate (22) and the movable filter plate (23) are provided with multiple equally spaced filter bags (25). The filter bags (25) only allow fluid to pass through in one direction. When the movable filter plate (23) moves longitudinally back and forth, a pressure difference is formed on both sides of the movable filter plate (23). The bottom of the filter box (21) is provided with a decolorizing agent addition pipe (27) and an aeration pipe (26) arranged in a serpentine shape. Both the decolorizing agent addition pipe (27) and the aeration pipe (26) are located below the filter plate structure.

2. The device for harmless recovery of saccharin sodium production wastewater according to claim 1, characterized in that, The opening and closing structure includes a control disk (14) rotatably mounted on a drive shaft (13). A circular cavity adapted to the control disk (14) is opened in the center of the partition (12). The control disk (14) is rotatably connected to the circular cavity in a sealed manner. Multiple openings (141) are arranged in a circular array on the control disk (14). Multiple openings (121) corresponding to the openings (141) are opened on the partition (12). When the openings (141) and the openings (121) overlap, the spaces on both sides of the partition (12) are connected. A damping mechanism is provided between the control disk (14) and the drive shaft (13), and a limiting mechanism is provided in the cavity to limit the rotation range of the control disk (14). The drive shaft (13) rotates through the frictional resistance of the damping mechanism to drive the control disk (14) to rotate. When the control disk (14) rotates to the limit position of the limiting mechanism, the drive shaft (13) rotates against the damping mechanism.

3. The device for harmless recovery of sodium saccharin production wastewater according to claim 2, characterized in that, The limiting mechanism includes a limiting post (122) disposed on the inner side wall of the circular cavity, and a limiting groove (142) is opened on the outer peripheral surface of the control disk (14), and the limiting post (122) is located in the limiting groove (142).

4. The device for harmless recovery of saccharin sodium production wastewater according to claim 1, characterized in that, The flocculation component (1) also includes a material extraction pipe (15), which connects the sedimentation chamber and the collection box (3). The bottommost partition (12) is conical, and the input end of the material extraction pipe (15) is connected to the bottom of the conical partition (12).

5. The device for harmless recovery of sodium saccharin production wastewater according to claim 1, characterized in that, Multiple stirring rods (16) are fixedly installed on the outer wall of the drive shaft (13), and the stirring rods (16) are located inside the flocculation chamber.

6. The device for harmless recovery of sodium saccharin production wastewater according to claim 1, characterized in that, The transmission mechanism includes a transmission sleeve (131) fixedly installed at the bottom end of the drive shaft (13), a transmission rod (241) slidably sleeved with the transmission sleeve (131) installed on the top of the movable frame (24), a pressure column (242) is radially installed on the side wall of the transmission rod (241), an inclined annular groove (132) is opened on the inner wall of the transmission sleeve (131), and the pressure column (242) extends into the annular groove (132) and abuts against the inner wall of the annular groove (132).

7. The device for harmless recovery of sodium saccharin production wastewater according to claim 1, characterized in that, The filter capsule (25) includes a base plate (251) with a disc-shaped opening facing upwards. The bottom end of the base plate (251) is provided with a ball head (253) with a filter hole (252) in the center. A buffer cavity (254) is also provided inside the ball head (253). The filter capsule (25) is made of elastic rubber.

8. The device for harmless recovery of sodium saccharin production wastewater according to claim 7, characterized in that, The lower sides of the fixed filter plate (22) and the movable filter plate (23) face the collection box (3). A slag discharge port (31) is provided on the side where the filter box (21) and the collection box (3) are connected. A sealing plate (32) for sealing the slag discharge port (31) is slidably provided inside the collection box (3). An adjustment structure for controlling the opening and closing state of the sealing plate (32) is provided on the side of the sealing plate (32) extending outside the collection box (3).

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