Process wastewater treatment equipment for nucleating agent production

Abstract

The invention relates to process wastewater treatment equipment for nucleating agent production. The process wastewater treatment equipment comprises an air floatation tank, the air floatation tank is communicated with a weir flow groove, a foam floating tank is arranged on one side of the weir flow groove, and a foam collecting plate is arranged on one side of the foam floating tank; the bottom of the weir flow groove is provided with a vibrating diaphragm located below the liquid level of the weir flow groove. The weir flow groove is provided with a vibration control mechanism used for driving the vibrating diaphragm to vibrate in the vertical direction so as to vibrate foam floating on the liquid level to the position above the liquid level. A rotating shaft and a power mechanism are rotationally arranged above the weir flow groove, and a plurality of scrapers are fixedly connected to the peripheral wall of the rotating shaft; the vibration control mechanism and the power mechanism are jointly connected with a slag removal controller, and the slag removal controller is configured to control the power mechanism to drive the rotating shaft to rapidly rotate by a set angle and brake after the vibration control mechanism drives the vibrating diaphragm to vibrate to vibrate floating foam on the liquid level to the position above the liquid level, so that the scraper plate scrapes the floating foam vibrated out of the position above the liquid level and throws the floating foam on the foam collecting plate. The device can transfer the floating foam and reduce the adhesion amount of the floating foam on the scraper blade under the condition that the scraper blade is not in direct contact with the wastewater.

Description

Technical Field

[0001] The present application relates to the technical field of industrial wastewater treatment, and in particular to a process wastewater treatment device for nucleating agent production. Background Art

[0002] At present, the domestic sorbitol-based transparent nucleating agent products are mainly the third generation, and its main raw materials are 3,4-dimethylbenzaldehyde and sorbitol. The two undergo an alcohol-aldehyde condensation reaction to obtain the third generation transparent nucleating agent products.

[0003] However, wastewater will be generated in the process steps such as the treatment during the reaction of 3,4-dimethylbenzaldehyde and sorbitol to produce sorbitol nucleating agents. In addition to producing the required sorbitol nucleating agents, these processes may also produce some by-products, unreacted raw materials and reaction media. The wastewater may also contain other chemical substances such as catalysts, solvents and promoters. Therefore, this type of wastewater needs to be treated before discharge to meet environmental protection requirements.

[0004] For example, in the related art, a Chinese patent with application number CN202220756044.7 proposes a device for treating wastewater from the production of polyether polyols, including a water collection tank, a regulating tank, a flotation device, a biochemical tank, a secondary sedimentation tank, a residual sludge tank and a discharge tank; the outlet of the regulating tank is connected to the water inlet of the flotation device, and the outlet of the flotation device is connected to the water inlet of the biochemical tank. The wastewater treated in the regulating tank is pumped into the flotation device, and a coagulant is added to the pipeline mixer of the flotation device. The micro-nano bubbles precipitated by the flotation device are combined with the suspended matter in the sewage, and the specific gravity of the suspended matter becomes smaller until it floats to the surface of the water body, forming a large amount of scum, and then the chain scraper installed on the flotation tank skims the scum to the sludge tank to achieve the treatment effect.

[0005] The above-mentioned related technologies have the following defects: when the chain scraper is scraping the floating foam above the flotation tank, the scraper on the chain scraper needs to move in the wastewater in the flotation tank to push the floating foam into the sludge tank. In this process, on the one hand, the scraper extended into the wastewater will carry a certain amount of wastewater when pushing the floating foam out of the flotation tank, so that the wastewater in the sludge tank also needs to be treated secondary; on the other hand, a certain amount of floating foam will always remain on the scraper and repeatedly enter the wastewater, thereby affecting the overall removal efficiency of the floating foam. Summary of the invention

[0006] In order to improve the problem that when a chain scraper is scraping off foam, there is always residue that affects the overall removal efficiency, the present application provides a process wastewater treatment equipment for nucleating agent production.

[0007] The present application provides a process wastewater treatment equipment for nucleating agent production using the following technical solution: A process wastewater treatment equipment for nucleating agent production, comprising a water collection tank, a regulating tank, an air flotation device, a biochemical tank, a secondary sedimentation tank, a residual sludge tank and a discharge tank connected in sequence, wherein the air flotation device comprises an air flotation tank, an air dissolving device and a dosing device, one side of the air flotation tank is connected to a weir flow channel, a froth pool is arranged on the side of the weir flow channel away from the air flotation tank, and a froth collecting plate is arranged on the side of the froth pool away from the air flotation tank; The bottom of the weir trough is provided with a diaphragm located below the liquid surface, and the weir trough is provided with a vibration control mechanism for driving the diaphragm to vibrate in a vertical direction so as to vibrate the foam on the liquid surface to above the liquid surface; A rotating shaft and a power mechanism for driving the rotating shaft to rotate step by step are rotatably arranged above the weir flow channel, and a plurality of scrapers are fixedly connected to the peripheral wall of the rotating shaft; The vibration control mechanism and the power mechanism are commonly connected to a slag removal controller, and the slag removal controller is configured to control the power mechanism to drive the rotating shaft to quickly rotate at a set angle and brake after the vibration control mechanism drives the diaphragm to vibrate to vibrate the floating foam on the liquid surface to above the liquid surface, so that the scraper can scrape the floating foam above the liquid surface and throw it off and stop it on the foam collecting plate.

[0008] Furthermore, the free end of the scraper is provided with a first arc portion curved in the direction of rotation thereof.

[0009] Furthermore, a plurality of water filtering holes are formed through the connection portion between the free end of the scraper and the first arc portion.

[0010] Furthermore, a second arc portion extending toward the weir flow channel is provided on the upper portion of the foam collecting plate. When the power mechanism drives the scraper to rotate rapidly at a fixed angle and stops, the second arc portion at least covers the scraper and the extension line of the first arc portion thereon.

[0011] Furthermore, the diaphragm is arranged at an angle, and a side of the diaphragm close to the air flotation pool is lower than a side of the diaphragm close to the froth pool.

[0012] Furthermore, the vibration control mechanism comprises: A mounting frame is mounted in the weir flow channel, and the diaphragm is fastened and fixed to the mounting frame; A base, fixedly connected to the lower end surface of the installation frame and sealed to the installation frame; A magnet is fixedly connected to the middle part of the base; An actuating coil is fixedly connected to a side of the diaphragm close to the magnet and is sleeved around the magnet with a gap, the actuating coil is connected to a current controller, and the slag removal controller is electrically connected to the current controller; The stabilizing sleeve is fixedly connected to the base and covers the actuating coil. A vibration space is provided between the stabilizing sleeve and the magnet for the actuating coil to vibrate up and down.

[0013] Furthermore, it also includes: A vibration sleeve, fixedly connected to a side of the vibration membrane close to the magnet, and the actuating coil is mounted on the vibration sleeve; A return spring is arranged in the vibration space, and one end of the return spring is fixedly connected to the vibration sleeve, and the other end of the return spring is fixedly connected to the base.

[0014] Furthermore, an infrared sensor located above the liquid surface is arranged on the side wall of the weir flow trough, and a plane pressure sensor inclined toward the rotating shaft is arranged on the upper end surface of the weir flow trough close to the froth pool, and the infrared sensor and the plane pressure sensor are both electrically connected to a vibration control controller; The vibration control controller is configured to: when the diaphragm is working and the infrared sensor does not detect the floating foam, control the current controller to increase the current passing through the actuating coil; Furthermore, when the diaphragm is working, if the pressure value detected by the planar pressure sensor is greater than a set value, the current controller is controlled to reduce the current passing through the actuating coil.

[0015] Furthermore, a connecting portion between the weir flow channel and the air flotation tank is provided with a flared guide wall.

[0016] Furthermore, a plurality of pneumatic nozzles for blowing the froth on the surface of the flotation pool into the weir flow channel are arranged on one side of the flotation pool away from the weir flow channel.

[0017] In summary, the beneficial technical effects of this application are: 1. When a large amount of scum is formed on the liquid surface of the flotation tank, the vibration control mechanism located in the weir flow trough drives the diaphragm to vibrate so as to vibrate the scum on the liquid surface in the weir flow trough to above the liquid surface. At the same time, the slag removal controller controls the power mechanism to drive the rotating shaft to rotate at a set angle and stop. In the process of the rotating shaft rotating at the set angle quickly, a scraper on the rotating shaft sweeps over the weir flow trough, scrapes the scum vibrated above the liquid surface, and uses the inertia of the scum after the scraper stops to make the scum fall off and stop on the scum collecting plate. After such a cycle, as the diaphragm continues to vibrate the scum on the liquid surface in the weir flow trough to above the liquid surface, multiple scrapers rotate at set angles and stop successively, the scum in the weir flow trough can be transferred to the scum collecting plate in turn, and finally flow into the scum tank for collection. After the scum in the weir flow trough is removed, the scum in the flotation tank gradually enters the weir flow trough and is continuously removed, so that the scum in the scum tank can be effectively removed. 2. In this process, the scraper does not directly extend into the wastewater, which can greatly reduce the wastewater content in the removed foam and reduce the need for secondary treatment of the removed foam. At the same time, since the separation of the foam and the scraper is achieved by the scraper driving the foam to quickly rotate to a set angle and then stop, the foam and the scraper are separated more thoroughly under the action of inertia, thereby reducing the amount of foam adhering to the scraper when it removes the foam again, thereby effectively ensuring the removal efficiency of the foam. 3. With the arrangement of the first arc portion, the foam can be prevented from sliding off the scraper during the rapid rotation of the scraper as much as possible, and the foam scraped on the scraper can be ensured to stay stably on the scraper during the rotation of the scraper at a set angle as much as possible, so that the foam vibrated by the diaphragm can be transferred by the scraper as much as possible; secondly, with the arrangement of the second arc portion, the foam collecting plate can further improve the interception effect of the foam thrown out by inertia after the scraper stops, so as to prevent the foam from flying out of the foam pool area; 4. A plurality of water filtering holes are formed through the connection between the free end of the scraper and the first arc portion. In this way, when the scraper drives the scraped scum and part of the wastewater to rotate rapidly at a set angle, the centrifugal force on this part of the wastewater is greater than that on the scum, and it is easier to pass through the water filtering holes and flow back into the weir flow channel, thereby reducing the wastewater content in the scum removed from the weir flow channel to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a top view of the overall structure of an embodiment of the present application; Figure 3 is along Figure 2 Schematic diagram of the cross-sectional structure along the AA line; Figure 4 It is a cross-sectional structural schematic diagram mainly used to show the scraping mechanism of the embodiment of the present application; Figure 5 yes Figure 4 A partial enlarged schematic diagram of part B; Figure 6 yes Figure 4 A partial enlarged schematic diagram of part C in the middle.

[0019] Description of reference numerals: 11. Water collection tank; 12. Regulating tank; 13. Air flotation tank; 14. Biochemical tank; 15. Secondary sedimentation tank; 16. Residual sludge tank; 17. Discharge tank; 2. Weir flow channel; 21. Guide wall; 22. Wave suppression board; 3. buoyancy pool; 31. buoyancy collecting plate; 311. second arc portion; 41. diaphragm; 42. mounting frame; 43. base; 44. magnet; 45. actuating coil; 46. stabilizing sleeve; 47. vibrating sleeve; 48. return spring; 49. vibrating space; 51. rotating shaft; 52. power mechanism; 53. scraper; 531. first arc portion; 532. water filter hole; 6. Pneumatic nozzle; 71. Infrared sensor; 72. Planar pressure sensor. DETAILED DESCRIPTION

[0020] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0021] The present application embodiment discloses a process wastewater treatment device for nucleating agent production. Figure 1 , Figure 2 and Figure 3 It includes a water collection tank 11, a regulating tank 12, a flotation device, a biochemical tank 14, a secondary sedimentation tank 15, a residual sludge tank 16 and a discharge tank 17 connected in sequence. The flotation device includes a flotation tank 13, a dissolved air device and a dosing device (not shown in the figure). The water inlet of the flotation tank 13 is connected to the regulating tank 12, and the water outlet is connected to the biochemical tank 14.

[0022] One side of the flotation tank 13 is connected to a weir flow trough 2, the upper end of the weir flow trough 2 is flush with the flotation tank 13, and the lower end is higher than the bottom wall of the flotation tank 13. The bottom wall of the weir flow trough 2 is inclined and the bottom wall at the end close to the flotation tank 13 is the lower end, so as to facilitate the backflow of sewage entering the weir flow trough 2. A froth pool 3 is arranged on the side of the weir flow trough 2 away from the flotation tank 13, and a froth collecting plate 31 is arranged on the side of the froth pool 3 away from the flotation tank 13. The froth collecting plate 31 is specifically vertically arranged and its upper end is higher than the top of the weir flow trough 2.

[0023] A scraping mechanism is provided on the weir flow channel 2, see Figure 4 , Figure 5 and Figure 6 The scraping mechanism includes a diaphragm 41 which is arranged on the weir flow groove 2 and is located below the liquid level in the weir flow groove 2. Specifically, the distance between the upper end surface of the diaphragm 41 and the liquid level in the weir flow groove 2 is no more than 20 mm. The weir flow groove 2 is provided with a vibration control mechanism for driving the diaphragm 41 to vibrate in the vertical direction so as to vibrate the floating foam on the liquid surface to above the liquid surface.

[0024] A rotating shaft 51 and a power mechanism 52 for driving the rotating shaft 51 to rotate in steps are rotatably arranged above the weir flow channel 2. A plurality of scrapers 53 are fixedly connected to the peripheral wall of the rotating shaft 51. The plurality of scrapers 53 are distributed in an equidistant circular array around the axis of the rotating shaft 51, and the angle between two adjacent scrapers 53 is the angle of a single rotation of the rotating shaft 51. The lowest end point of the trajectory of the driven swing of the free end of the scraper 53 is not lower than the liquid level of the weir flow channel 2. The power mechanism 52 can be a stepping motor or a servo motor with a braking function. In order to ensure the angular velocity of the driven scraper 53, in the present embodiment, the power mechanism 52 is configured as a servo motor with a braking function, and the speed of the servo motor is not less than 300 revolutions per minute.

[0025] The vibration control mechanism and the power mechanism 52 are commonly connected to a slag removal controller, which is configured to control the power mechanism 52 to drive the rotating shaft 51 to quickly rotate to a set angle and brake after the vibration control mechanism drives the diaphragm 41 to vibrate to vibrate the floating foam on the liquid surface to above the liquid surface, so that the scraper 53 scrapes the floating foam above the liquid surface and drops it on the foam collecting plate 31.

[0026] Therefore, when the dosing device in the flotation device adds coagulant to the flotation tank 13, it can promote the aggregation and flocculation of suspended matter and colloidal particles in the wastewater; and after the dissolved air device precipitates a large number of micro-nano bubbles into the wastewater in the flotation tank 13, these micro-nano bubbles combine with the suspended matter in the sewage, and the specific gravity of the suspended matter becomes smaller until it floats to the surface of the water body, forming a large amount of scum on the liquid surface of the flotation tank 13. At this time, the vibration control mechanism located in the weir flow channel 2 drives the diaphragm 41 to vibrate so as to vibrate the floating foam on the liquid surface in the weir flow channel 2 to above the liquid surface, and at the same time, the scum removal controller controls the power mechanism 52 to drive the rotating shaft 51 to rotate the set angle and stop. In the process of the rotating shaft 51 rotating rapidly at the set angle, a scraper 53 on the rotating shaft 51 sweeps over the weir flow channel 2, and scrapes the floating foam vibrated above the liquid surface and uses the inertia of the floating foam after the scraper 53 stops, so that the floating foam is thrown off and stopped. On the foam collecting plate 31; after such a cycle, as the diaphragm 41 continues to vibrate the floating foam on the liquid surface in the weir flow channel 2 to above the liquid surface, multiple scrapers 53 rotate the set angles and stop successively, the floating foam in the weir flow channel 2 can be transferred to the foam collecting plate 31 in turn, and finally flow into the floating foam pool 3 for collection. After the floating foam in the weir flow channel 2 is removed, the floating foam in the flotation pool 13 also gradually enters the weir flow channel 2 and is continuously removed, so that the floating foam in the floating foam pool 3 can be effectively removed.

[0027] In addition, during this process, the scraper 53 does not directly extend into the wastewater, which can greatly reduce the wastewater content in the removed foam and reduce the need for secondary treatment of the removed foam. At the same time, since the separation of the foam and the scraper 53 is achieved by the scraper 53 driving the foam to quickly rotate at a set angle and then stop, the foam and the scraper 53 are separated more thoroughly under the action of inertia, thereby reducing the amount of foam adhering to the scraper 53 when it removes the foam again, thereby effectively ensuring the removal efficiency of the foam.

[0028] Among them, the minimum speed limit of the servo motor in the power mechanism 52 is based on the time it takes for the foam vibrated above the liquid surface by the diaphragm 41 to fall back to the liquid surface in free fall. Calculated as if the foam is vibrated 20 mm above the liquid surface, its free fall time under ideal conditions is approximately 0.064 seconds. For a servo motor with a speed of 300 rpm, the time required to rotate through a set angle, such as 90°, is 0.05 seconds. Therefore, at this speed, it can be ensured that each scraper 53 can scrape the foam vibrated by the diaphragm 41 before it falls back to the liquid surface, and the fixed-angle braking performance of the servo motor can be ensured, so as not to affect the performance of the power mechanism 52 after long-term operation.

[0029] In order to further ensure that the scraper 53 can stably scrape the floating foam and stop it on the foam collecting plate 31 when rotating, refer to Figure 4 , Figure 5 and Figure 6 A first arc portion 531 bent in the direction of rotation is provided at the free end of the scraper 53, and a second arc portion 311 extending toward the weir flow channel 2 is provided on the upper part of the foam collecting plate 31. When the power mechanism 52 drives the scraper 53 to rotate rapidly at a fixed angle and stops, the second arc portion 311 at least covers the scraper 53 and the extension line of the first arc portion 531 thereon, but does not interfere with the normal rotation of the scraper 53 and the first arc portion 531.

[0030] Therefore, by means of the setting of the first arc portion 531, it is possible to avoid as much as possible the floating foam sliding off the scraper 53 during the rapid rotation of the scraper 53, and to ensure as much as possible that the floating foam scraped thereon stays stably on the scraper 53 during the rotation of the set angle of the scraper 53, so that the floating foam vibrated by the diaphragm 41 can be transferred by the scraper 53 as much as possible; secondly, by means of the setting of the second arc portion 311, the interception effect of the foam collecting plate 31 on the floating foam thrown out by inertia after the scraper 53 stops can be further improved, thereby preventing the floating foam from flying out of the floating foam pool 3 area.

[0031] In addition, considering that the movement trajectory of the free end of the scraper 53 above the liquid surface of the weir flow channel 2 is an arc, Figure 4, the diaphragm 41 is further arranged to be inclined, and the side of the diaphragm 41 close to the flotation tank 13 is lower than the side close to the froth tank 3. Therefore, when the diaphragm 41 is working, the distance between the froth vibrated by it and the liquid surface of the weir flow channel 2 increases from small to large along the moving direction of the free end of the scraper 53, which can ensure that the scraper 53 can effectively transfer the froth vibrated by the diaphragm 41 as completely as possible during the process of rotating the set angle, so that it will not fall back into the weir flow channel 2.

[0032] At the same time, it is also considered that the foam vibrated out by the diaphragm 41 during vibration will also contain a certain amount of waste water, which can promote the upward vibration of the foam. Although the waste water in the foam and the foam itself are in free fall, the foam itself is subject to a greater falling resistance, causing the waste water in the foam to fall faster than the foam itself, there will still be a part of the waste water dissolved in the foam.

[0033] To further reduce the wastewater content in the removed scum, refer to Figure 1 Figure 4 A plurality of water filtering holes 532 are also provided through the connection between the free end of the scraper 53 and the first arc portion 531. In this way, when the scraper 53 drives the scraped scum and part of the wastewater to rotate rapidly at a set angle, the part of the wastewater is subjected to a greater centrifugal force than the scum, and is more likely to pass through the water filtering holes 532 and flow back to the weir flow channel 2, thereby reducing the wastewater content in the scum removed from the weir flow channel 2 to a certain extent.

[0034] In addition, in another feasible embodiment, further considering that the process wastewater for nucleating agent production contains a certain amount of alcohols, aldehydes, etc., which have a certain viscosity after flocculation, in order to further improve the phenomenon of residual foam on the scraper 53 after the scraper 53 throws out the foam, a hydrophobic and oleophobic coating can be provided on the scraper 53 and the first arc portion 531 on the side along the rotation direction of the shaft 51. Because the hydrophobic and oleophobic coating has a very low surface energy, it is difficult for water and grease to form a stable contact on its surface, which can greatly improve the effect of throwing out the foam when the scraper 53 stops after scraping the foam. However, in order to avoid the scraper 53 surface being too smooth and unable to scrape and transfer a set amount of foam, the hydrophobic and oleophobic coating should be provided as needed.

[0035] On the other hand, since the amount of wastewater in the production of nucleating agents is large, it is inefficient to rely solely on the froth in the flotation tank 13 to flow to the weir flow channel 2. Figure 1 , Figure 2 and Figure 3, a flared guide wall 21 is provided at the connecting portion between the weir flow channel 2 and the flotation tank 13, and the flared end of the guide wall 21 is connected to the width direction edge of the flotation tank 13. In another embodiment, a plurality of wave suppression plates 22 are also provided at the flared end of the guide wall 21 to reduce the influence of the surge in the flotation tank 13 on the stability of the liquid level in the weir flow channel 2. And a plurality of pneumatic nozzles 6 for blowing the foam on the surface of the flotation tank 13 into the weir flow channel 2 are provided on the side of the flotation tank 13 away from the weir flow channel 2. However, it should be clearly stated that the airflow ejected by the pneumatic nozzle 6 shall not cause significant damage to the foam formed on the surface of the flotation tank 13, so as to prevent the suspended matter entrained in the foam from sinking back into the wastewater of the flotation tank 13. In the specific setting, the spray direction of the pneumatic nozzle 6 can be set to blow slightly obliquely or horizontally toward the direction where the weir flow channel 2 is located.

[0036] Therefore, under the action of multiple pneumatic nozzles 6, while minimizing the damage to the foam already formed on the liquid surface of the flotation tank 13, the foam can be promoted to continuously move through the guide wall 21 to the weir flow channel 2, so as to facilitate the continuous operation of the diaphragm 41 and the scraper 53 and ensure the efficiency of removing the foam.

[0037] In addition, the above-mentioned vibration control mechanism can be specifically an electromagnetic vibrator in conventional technology. By sealing and installing the diaphragm 41 on the brake component of the electromagnetic vibrator, the vibration of the diaphragm 41 on demand can be achieved. For example, the slag removal controller controls the vibration control mechanism to work so that the diaphragm 41 works at a set amplitude to vibrate the floating foam on the liquid surface out of a set distance range. At the same time, the slag removal controller controls the rotation of the shaft 51 to rotate so that the scraper 53 scrapes this part of the floating foam. By controlling the diaphragm 41 to work at a set vibration frequency and setting the rotation speed of the shaft 51 in a reasonable range through the vibration control mechanism, the diaphragm 41 and the plurality of scrapers 53 can work continuously to continuously remove the floating foam.

[0038] For easier understanding, please refer to Figure 4 , Figure 5 and Figure 6 , the vibration control mechanism may include: The mounting frame 42 is mounted in the weir flow channel 2, and the diaphragm 41 is fastened and fixed on the mounting frame 42, wherein the diaphragm 41 can be made of PVDF, PES or PP, etc., which has good heat resistance, chemical resistance and mechanical strength, and can maintain a good excitation effect under long-term high-frequency vibration; The base 43 is fixed to the lower end surface of the installation frame 42 and is sealed with the installation frame 42; The magnet 44 is fixed to the middle of the base 43 and can be a permanent magnet or an electromagnet; The actuating coil 45 is fixed to one side of the diaphragm 41 close to the magnet 44 and is sleeved around the outer periphery of the magnet 44. The actuating coil 45 is connected to a current controller, and the slag removal controller is electrically connected to the current controller; the current controller may be a PWM controller, an analog controller, a digital controller, etc. The stabilizing sleeve 46 is fixedly connected to the base 43 and covers the actuating coil 45. A vibration space 49 is defined between the stabilizing sleeve 46 and the magnet 44 for the actuating coil 45 to vibrate up and down. A vibration sleeve 47 is fixedly connected to a side of the vibration membrane 41 close to the magnet 44, and the actuating coil 45 is mounted on the vibration sleeve 47; The return spring 48 is disposed in the vibration space 49 , and one end of the return spring 48 is fixedly connected to the vibration sleeve 47 , and the other end of the return spring 48 is fixedly connected to the base 43 .

[0039] Therefore, by controlling the frequency and magnitude of the current passing through the actuating coil 45 through the current controller, a dynamic magnetic field can be applied to the actuating coil 45. This dynamic magnetic field interacts with the magnetic field of the magnet 44, generally in the form of magnetic repulsion, causing the actuating coil 45 to move upward in the vibration space 49, thereby driving the diaphragm 41 to vibrate upward, and the reset spring 48 is stretched and deformed, providing reset capability for the diaphragm 41 and the actuating coil 45; the stabilizing sleeve 46 and the vibration sleeve 47 provide support for the vibration stability of the diaphragm 41 and guide the vibration direction, thereby ensuring that the diaphragm 41 can vibrate at the set amplitude and frequency under the control of the current controller.

[0040] Among them, considering the sealing performance of the diaphragm 41, the mounting frame 42, and the base 43, on the one hand, they can be frequently inspected and repaired, and on the other hand, multiple sealing rubber rings or corresponding oil seal structures can be provided, such as Figure 5 As shown, the service life of the electrical components in the vibration control mechanism is guaranteed. The specific configuration is conventional technical means and will not be described in detail here.

[0041] Furthermore, in order to ensure that the plurality of scrapers 53 can scrape off the foam vibrated by the diaphragm 41 during the process of following the rotation of the rotating shaft 51 , excessive waste water is prevented from entering the foam pool 3 as much as possible.

[0042] In another possible embodiment, referring to Figure 4, an infrared sensor 71 located above the liquid level is arranged on the side wall of the weir trough 2, specifically, the transmitting end and the receiving end of the infrared sensor 71 are arranged on two opposite side walls of the weir trough 2, and the infrared sensor 71 can be specifically set as an infrared grating, and the detection surface of the infrared sensor 71 is located above the liquid level in the weir trough 2 and below the lowest position of the scraper 52 track. A plane pressure sensor 72 inclined toward the rotating shaft 51 is arranged on the upper end surface of the side of the weir trough 2 close to the foam pool 3, and the pressure sensor 72 is used to monitor the impact force of the wastewater thrown out of the water filter hole 532 on the scraper 52 when the scraper 52 rotates after scraping the foam, so as to feedback the amount of wastewater scraped by the scraper 52, and the arrangement of the plane pressure sensor 72 is preferably not to interfere with the normal rotation of the scraper 52, and the detection surface of the plane pressure sensor 72 is provided with a corrosion-resistant coating or film.

[0043] The infrared sensor 71 and the plane pressure sensor 72 are both electrically connected to a vibration control controller, which is configured as follows: When the diaphragm 41 is working, the infrared sensor 71 does not detect the floating foam, and then controls the current controller to increase the current passing through the actuating coil 45; Furthermore, when the diaphragm 41 is working, if the pressure value detected by the planar pressure sensor 72 is greater than the set value, the current controller is controlled to reduce the current passing through the actuating coil 45 .

[0044] Therefore, when the diaphragm 41 is working to vibrate the foam and part of the waste water to a lower stroke above the liquid surface, the infrared sensor 71 does not detect the obstruction of the foam or waste water. At this time, the vibration control controller controls the current controller to work, so as to increase the current passing through the actuating coil 45, thereby increasing the amplitude of the diaphragm 41 to increase the distance between the foam and part of the waste water and the liquid surface after being vibrated out of the liquid surface, thereby ensuring that the scraper 53 can stably scrape the foam when rotating.

[0045] When the amplitude of the diaphragm 41 is too large, the amount of waste water vibrated by the diaphragm 41 to above the liquid surface also increases accordingly. In this way, when the scraper 53 rotates rapidly and throws out the waste water and foam, the waste water is thrown out of the water filter hole 532 of the scraper 53 before the foam and impacts the planar sensor. At this time, the pressure value detected by the planar sensor increases and is greater than the set value; therefore, the vibration control controller controls the current controller to work so as to reduce the current passing through the actuating coil 45, thereby reducing the amplitude of the diaphragm 41, avoiding vibrating too much waste water to the liquid surface and affecting the scraping efficiency of the foam.

[0046] Therefore, it is necessary to further explain that the setting of the plane pressure sensor 72 can be set according to actual production, but the amplitude of the diaphragm 41 corresponding to the detection value of the plane pressure sensor 72 when it is equal to the set value should be greater than the amplitude of the diaphragm 41 corresponding to the infrared sensor 71 when it stably monitors the foam; that is, the setting of the infrared sensor 71 limits the minimum value of the amplitude of the diaphragm 41, while the setting of the plane pressure sensor 72 limits the maximum value of the amplitude of the diaphragm 41, thereby ensuring the automatic coordination between the diaphragm 41 and the scraper 53.

[0047] In addition, considering that the diaphragm 41 in the weir flow trough 2 needs to be kept at a certain depth below the liquid surface of the weir flow trough 2 to ensure a good excitation effect on the floating foam, for this purpose, a liquid level sensor (not shown in the figure) can also be set in the flotation tank 13, and the liquid level sensor is connected to the control valve on the water inlet pipe of the flotation tank 13, so as to ensure the stability of the water level height in the weir flow trough 2 as much as possible.

[0048] The implementation principle of a process wastewater treatment device for nucleating agent production in the embodiment of the present application is as follows: When a large amount of scum is formed on the liquid surface of the flotation tank 13, the vibration control mechanism located in the weir flow channel 2 drives the diaphragm 41 to vibrate so as to vibrate the scum on the liquid surface in the weir flow channel 2 to above the liquid surface. At the same time, the scum removal controller controls the power mechanism 52 to drive the rotating shaft 51 to rotate by a set angle and stop. During the process of the rotating shaft 51 rotating at a fast speed by the set angle, a scraper 53 on the rotating shaft 51 sweeps over the weir flow channel 2 and scrapes the scum vibrated above the liquid surface and stops the scum by the inertia of the scum after the scraper 53 stops. On the foam collecting plate 31; after such a cycle, as the diaphragm 41 continues to vibrate the floating foam on the liquid surface in the weir flow channel 2 to above the liquid surface, multiple scrapers 53 successively rotate to a set angle and stop, the floating foam in the weir flow channel 2 can be transferred to the foam collecting plate 31 in turn, and finally flow into the floating foam pool 3 for collection. After the floating foam in the weir flow channel 2 is removed, the floating foam in the flotation pool 13 gradually enters the weir flow channel 2 and is continuously removed under the action of multiple pneumatic nozzles 6, which can achieve an effective removal effect on the floating foam in the floating foam pool 3.

[0049] In addition, during this process, the scraper 53 does not directly extend into the wastewater, which can greatly reduce the wastewater content in the removed foam and reduce the need for secondary treatment of the removed foam. At the same time, since the separation of the foam and the scraper 53 is achieved by the scraper 53 driving the foam to quickly rotate at a set angle and then stop, the foam and the scraper 53 are separated more thoroughly under the action of inertia, thereby reducing the amount of foam adhering to the scraper 53 when it removes the foam again, thereby effectively ensuring the removal efficiency of the foam.

[0050] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process wastewater treatment device for nucleating agent production, comprising a water collection tank (11), a regulating tank (12), an air flotation device, a biochemical tank (14), a secondary sedimentation tank (15), a residual sludge tank (16) and a discharge tank (17) connected in sequence, wherein the air flotation device comprises an air flotation tank (13), an air dissolving device and a dosing device, characterized in that: One side of the flotation pool (13) is connected to a weir flow channel (2), a froth pool (3) is provided on the side of the weir flow channel (2) away from the flotation pool (13), and a froth collecting plate (31) is provided on the side of the froth pool (3) away from the flotation pool (13); A diaphragm (41) located below the liquid surface is arranged at the bottom of the weir flow channel (2), and a vibration control mechanism for driving the diaphragm (41) to vibrate in a vertical direction to vibrate the foam on the liquid surface to above the liquid surface is arranged on the weir flow channel (2); A rotating shaft (51) and a power mechanism (52) for driving the rotating shaft (51) to rotate in steps are rotatably disposed above the weir flow channel (2); a plurality of scrapers (53) are fixedly connected to the peripheral wall of the rotating shaft (51); The vibration control mechanism and the power mechanism (52) are connected together with a slag removal controller. The slag removal controller is configured to control the power mechanism (52) to drive the rotating shaft (51) to quickly rotate to a set angle and brake after the vibration control mechanism drives the diaphragm (41) to vibrate to vibrate the floating foam on the liquid surface to above the liquid surface, so that the scraper (53) scrapes the floating foam above the liquid surface and throws it off and stops it on the foam collecting plate (31).

2. The process wastewater treatment equipment for nucleating agent production according to claim 1, characterized in that: The free end of the scraper (53) is provided with a first arc portion (531) that is curved in the direction of rotation thereof.

3. The process wastewater treatment equipment for nucleating agent production according to claim 2, characterized in that: A plurality of water filtering holes (532) are provided through the connection portion between the free end of the scraper (53) and the first arc portion (531).

4. The process wastewater treatment equipment for nucleating agent production according to claim 2, characterized in that: The upper portion of the foam collecting plate (31) is provided with a second arc portion (311) extending in a direction close to the weir flow channel (2); when the power mechanism (52) drives the scraper (53) to rotate rapidly at a fixed angle and stops, the second arc portion (311) at least covers the scraper (53) and an extension line of the first arc portion (531) thereon.

5. The process wastewater treatment equipment for nucleating agent production according to claim 1, characterized in that: The diaphragm (41) is arranged in an inclined manner, and a side of the diaphragm (41) close to the air flotation pool (13) is lower than a side of the diaphragm (41) close to the froth pool (3).

6. A process wastewater treatment equipment for nucleating agent production according to any one of claims 1 to 5, characterized in that: The vibration control mechanism comprises: A mounting frame (42) is mounted in the weir flow channel (2), and the diaphragm (41) is tensioned and fixedly connected to the mounting frame (42); A base (43) is fixedly connected to the lower end surface of the installation frame (42) and is sealed to the installation frame (42); A magnet (44) fixedly connected to the middle portion of the base (43); an actuating coil (45) fixedly connected to a side of the diaphragm (41) close to the magnet (44) and sleeved around the outer periphery of the magnet (44) with a gap, the actuating coil (45) being connected to a current controller, and the slag removal controller being electrically connected to the current controller; A stabilizing sleeve (46) is fixedly connected to the base (43) and is disposed outside the actuating coil (45). A vibration space (49) is provided between the stabilizing sleeve (46) and the magnet (44) for the actuating coil (45) to vibrate up and down.

7. The process wastewater treatment equipment for nucleating agent production according to claim 6, characterized in that: Also includes: A vibration sleeve (47) is fixedly connected to a side of the vibration membrane (41) close to the magnet (44), and the actuating coil (45) is mounted on the vibration sleeve (47); A return spring (48) is disposed in the vibration space (49), with one end of the return spring being fixedly connected to the vibration sleeve (47) and the other end of the return spring being fixedly connected to the base (43).

8. The process wastewater treatment equipment for nucleating agent production according to claim 6, characterized in that: An infrared sensor (71) located above the liquid surface is arranged on the side wall of the weir flow trough (2); a plane pressure sensor (72) inclined toward the rotating shaft (51) is arranged on the upper end surface of the weir flow trough (2) close to the froth pool (3); and both the infrared sensor (71) and the plane pressure sensor (72) are electrically connected to a vibration control controller; The vibration control controller is configured to: when the diaphragm (41) is working and the infrared sensor (71) does not detect any floating foam, control the current controller to increase the current passing through the actuating coil (45); Furthermore, when the diaphragm (41) is working, the pressure value detected by the planar pressure sensor (72) is greater than a set value, and the current controller is controlled to reduce the current passing through the actuating coil (45).

9. A process wastewater treatment equipment for nucleating agent production according to any one of claims 1 to 5, characterized in that: The connecting portion between the weir flow channel (2) and the air flotation tank (13) is provided with a flared flow guide wall (21).

10. The process wastewater treatment equipment for nucleating agent production according to claim 9, characterized in that: A plurality of pneumatic nozzles (6) for blowing foam on the surface of the air flotation pool (13) into the weir flow channel (2) are arranged on a side of the air flotation pool (13) away from the weir flow channel (2).

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